IEC TS 61851-3-7:2023

Electric vehicles conductive charging system - Part 3-7: DC EV supply equipment where protection relies on double or reinforced insulation - Battery system communication

IEC TS 61851-3-7:2023 This part of IEC 61851, which is a Technical Specification, applies to CANopen communication for the conductive transfer of electric power between the supply network and an electric road vehicle or a removable RESS or traction-battery of an electric road vehicle.
This document specifies application objects provided by the battery system.

General Information

• Status: Published
• Publication Date: 17-Jul-2023
• ICS: 43.120 - Electric road vehicles
• Technical Committee: TC 69 - Electrical power/energy transfer systems for electrically propelled road vehicles and industrial trucks
• Drafting Committee: WG 10 - TC 69/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 18-Jul-2023
• Completion Date: 02-Nov-2022

Overview

IEC TS 61851-3-7:2023 is a Technical Specification from the International Electrotechnical Commission (IEC) that covers CANopen communication for DC conductive charging between the supply network and an electric road vehicle (EV) or a removable Rechargeable Energy Storage System (RESS) / traction battery. It applies specifically to DC EV supply equipment where protection relies on double or reinforced insulation and specifies the battery system application objects used for battery-to-charger data exchange.

Key topics

• Scope and purpose: Defines the CANopen-based message and object model for battery system communication during conductive DC charging.
• Finite State Automaton (FSA): Operating principles and state definitions for battery system interaction with DC EV supply equipment.
• Object dictionary / application objects: Detailed definition of produced and consumed CANopen objects for battery systems (examples in the TS include objects such as 6100 Type of battery cells, 6164 Relative battery system Wh capacity (SOC), 6176 SOH, temperature, cell voltages and capacity counters).
• Data types and structures: Complex data types, grouped sub-indices and object value structures to ensure consistent interpretation.
• Battery-specific parameters: Temperature limits, maximum/minimum cell voltages, capacity metrics (Wh / Ah), balance and lifecycle counters, and charging/discharging rules where applicable.
• Optional and mandatory objects: Differentiation between strictly required objects and optional objects for enhanced monitoring (relevant for swap/rental battery systems).

Applications

• Enables interoperable communication between DC charging stations and EV battery systems using CANopen.
• Supports battery management and safe charging control, including state of charge (SOC), state of health (SOH), cell voltage monitoring, and temperature-based protections.
• Useful in battery swap / rental models where mandatory identification and cell-voltage objects are needed for safe interchangeability.
• Applicable to manufacturers of DC EV supply equipment, EV OEMs, battery pack designers and integrators, and software developers implementing CANopen profiles for charging.

Who should use this standard

• EV and RESS/traction battery manufacturers implementing CANopen interfaces.
• Charging station OEMs designing DC EVSE that rely on double or reinforced insulation.
• BMS engineers, system integrators, test laboratories and compliance teams verifying battery–charger interoperability.
• Fleet operators and service providers managing swap/rental battery systems.

Related Standards (if applicable)

• Part of the IEC 61851 series on electric-vehicle conductive charging systems and aligns with CANopen communication practices. Implementers should consult other IEC 61851 parts and CANopen (CiA) documentation for complete system-level requirements.

Keywords: IEC TS 61851-3-7:2023, CANopen, DC EV supply equipment, conductive charging, battery system communication, SOC, SOH, BMS, RESS, double or reinforced insulation.

Standards Content (Sample)

IEC TS 61851-3-7 ®
Edition 1.0 2023-07
TECHNICAL
SPECIFICATION
colour
inside
Electric vehicles conductive charging system –
Part 3-7: DC EV supply equipment where protection relies on double or
reinforced insulation – Battery system communication

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IEC TS 61851-3-7 ®
Edition 1.0 2023-07
TECHNICAL
SPECIFICATION
colour
inside
Electric vehicles conductive charging system –

Part 3-7: DC EV supply equipment where protection relies on double or

reinforced insulation – Battery system communication

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 43.120 ISBN 978-2-8322-5736-4

– 2 – IEC TS 61851-3-7:2023 © IEC 2023
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 11
4 Symbols and abbreviated terms . 12
5 Operating principles . 12
5.1 General . 12
5.2 Battery system specific FSA. 12
5.3 State definitions . 13
5.4 Transitions in the FSA for battery systems . 13
6 Object dictionary. 14
6.1 General . 14
6.2 Additional definitions to general application objects . 15
6.2.1 General . 15
6.2.2 Object 6001 : Control word . 15
h
6.2.3 Object 6002 : Status word . 15
h
6.3 Detailed complex data type specifications . 15
6.3.1 General . 15
6.3.2 Object 0081 to 0082 : Reserved . 16
h h
6.3.3 Object 0083 : Ni-MH charging rules parameter record . 16
h
6.4 Produced application objects . 16
6.4.1 General . 16
6.4.2 Object 6100 : Type of battery cells . 16
h
6.4.3 Object 6102 : Battery system rated Wh capacity (optional) . 20
h
6.4.4 Object 6105 : Battery system temperature . 22
h
6.4.5 Object 6126 : Battery system maximum cell voltage (optional,
h
mandatory for rental/swap battery systems) . 25
6.4.6 Object 6127 : Battery system minimum cell voltage (optional,
h
mandatory for rental/swap battery systems) . 27
6.4.7 Object 6160 : Actual battery system Wh capacity . 28
h
6.4.8 Object 6162 : Full EMS output battery system Wh capacity (optional,
h
mandatory for rental/swap battery systems) . 30
6.4.9 Object 6164 : Relative battery system Wh capacity (SOC) (optional) . 32
h
6.4.10 Object 6192 : Reserved . 34
h
6.4.11 Object 6193 : Threshold time of the battery system maximum charging
h
time . 34
6.5 Produced application objects (optional) . 35
6.5.1 General . 35
6.5.2 Object 6101 : Battery system connecting status (optional) . 35
h
6.5.3 Object 6103 : Battery system rated Ah capacity (optional) . 38
h
6.5.4 Object 6104 : Battery system number of cells (optional) . 39
h
6.5.5 Object 6106 : Battery system lifetime (optional) . 41
h
6.5.6 Object 6107 : Battery system lifetime in cycles (optional) . 42
h
6.5.7 Object 6108 : Battery system lifetime EMS input capacity (optional) . 44
h
6.5.8 Object 6109 : Battery system manufacturer (optional) . 45
h
6.5.9 Object 610A : Battery system cell manufacturer (optional) . 47
h
6.5.10 Object 610B : Battery system cell notation (optional) . 48
h
6.5.11 Object 6120 : Battery system maximum charge start temperature
h
(optional) . 49
6.5.12 Object 6121 : Battery system minimum charge start temperature
h
(optional) . 51
6.5.13 Object 6122 : Battery system maximum discharge temperature
h
(optional) . 53
6.5.14 Object 6123 : Battery system minimum discharge temperature
h
(optional) . 54
6.5.15 Object 6124 : Battery system maximum temperature for storage
h
(optional) . 56
6.5.16 Object 6125 : Battery system minimum temperature for storage
h
(optional) . 58
6.5.17 Object 6161 : Actual battery system Ah capacity (optional) . 59
h
6.5.18 Object 6163 : Full EMS output battery system Ah capacity (optional) . 61
h
6.5.19 Object 6165 : Battery system VDN 1 actual cell voltage (optional) . 62
h
6.5.20 Object 6166 to 6174 : Battery system VDN 2 to 16 actual cell voltage
h h
(optional) . 64
6.5.21 Object 6175 : Battery system balance (optional) . 64
h
6.5.22 Object 6176 : Battery system SOH (optional) . 65
h
6.5.23 Object 6177 : Battery system EMS output time (optional) . 67
h
6.5.24 Object 6178 : Battery system EMS input time (optional) . 69
h
6.5.25 Object 6179 : Battery system EMS output Ah counter (optional) . 70
h
6.5.26 Object 617A : Battery system EMS input Ah counter (optional) . 72
h
6.5.27 Object 617B : Battery system EMS output Wh counter (optional) . 74
h
6.5.28 Object 617C : Battery system EMS input Wh counter (optional) . 75
h
6.5.29 Object 617D : Battery system EMS output counter (optional) . 77
h
6.5.30 Object 617E : Battery system EMS input counter (optional) . 79
h
6.5.31 Object 617F : Battery system deep discharging counter (optional) . 80
h
6.5.32 Object 6180 : Battery system short-circuit counter (optional) . 82
h
6.5.33 Object 6181 : Battery system over-temperature counter (optional) . 83
h
6.5.34 Object 6182 : Temperature dependent average EMS output current
h
(optional) . 85
6.5.35 Object 6183 : Temperature dependent peak EMS output current
h
(optional) . 86
6.5.36 Object 6184 : Temperature dependent average EMS input current
h
(optional) . 87
6.5.37 Object 6185 : Temperature dependent peak EMS input current
h
(optional) . 88
6.5.38 Object 6186 : Temperature dependent capacity correction (optional) . 89
h
– 4 – IEC TS 61851-3-7:2023 © IEC 2023
6.5.39 Object 6187 : Battery system capacity dependent current correction
h
(optional) . 90
6.5.40 Object 6188 : Battery system temperature dependent self-discharge
h
rate (optional) . 92
6.5.41 Object 6189 : Temperature dependent cell charge maximum voltage
h
(optional) . 93
6.5.42 Object 618A : Battery system 100 % to 90 % capacity dependent
h
voltage correction (optional) . 94
6.5.43 Object 618B : Battery system 0 % to 10 % capacity dependent voltage
h
correction (optional) . 95
6.5.44 Object 618C : Battery system point of cell balancing (optional) . 96
h
6.6 Consumed application objects . 98
6.6.1 General . 98
6.6.2 Object 618F : EMS output rules for Ni-MH battery system (optional) . 98
h
6.6.3 Object 618D : Battery system go to deep sleep mode timing (optional) . 101
h
6.6.4 Object 618E : Battery system minimal SOC for go to deep sleep mode
h
(optional) . 103
6.6.5 Object 6190 : Battery system specific controls (optional) . 104
h
Figure 1 – FSA for battery system . 13
Figure 2 – Value structure . 16
Figure 3 – Object structure . 36
Figure 4 – Object structure . 39

Table 1 – States behaviour . 13
Table 2 – Transitions, events and actions . 14
Table 3 – Value definition . 15
Table 4 – Value definition for VD specific FSA control. 15
Table 5 – Value definition for virtual device FSA state . 15
Table 6 – Ni-MH charging rules parameter record . 16
Table 7 – Value definition . 17
Table 8 – Object description . 18
Table 9 – Entry description . 19
Table 10 – Object description . 20
Table 11 – Entry description . 21
Table 12 – Grouping of sub-indices . 22
Table 13 – Object description . 23
Table 14 – Entry description . 23
Table 15 – Object description . 25
Table 16 – Entry description . 26
Table 17 – Object description . 27
Table 18 – Entry description . 27
Table 19 – Object description . 29
Table 20 – Entry description . 29
Table 21 – Object description . 30

Table 22 – Entry description . 31
Table 23 – Value definition . 32
Table 24 – Object description . 32
Table 25 – Entry description . 33
Table 26 – Entry description . 34
Table 27 – Entry description . 35
Table 28 – Value definition . 36
Table 29 – Object description . 36
Table 30 – Entry description . 37
Table 31 – Object description . 38
Table 32 – Entry description . 38
Table 33 – Value definition for the parallel and series cell number fields . 40
Table 34 – Object description . 40
Table 35 – Entry description . 40
Table 36 – Object description . 41
Table 37 – Entry description . 42
Table 38 – Object description . 43
Table 39 – Entry description . 43
Table 40 – Object description . 44
Table 41 – Entry description . 44
Table 42 – Object description . 46
Table 43 – Entry description . 46
Table 44 – Object description . 47
Table 45 – Entry description . 47
Table 46 – Object description . 48
Table 47 – Entry description . 49
Table 48 – Object description . 50
Table 49 – Entry description . 50
Table 50 – Object description . 51
Table 51 – Entry description . 52
Table 52 – Object description . 53
Table 53 – Entry description . 53
Table 54 – Object description . 55
Table 55 – Entry description . 55
Table 56 – Object description . 56
Table 57 – Entry description . 56
Table 58 – Object description . 58
Table 59 – Entry description . 58
Table 60 – Object description . 59
Table 61 – Entry description . 60
Table 62 – Object description . 61
Table 63 – Entry description . 61
Table 64 – Object description . 63

– 6 – IEC TS 61851-3-7:2023 © IEC 2023
Table 65 – Entry description . 63
Table 66 – Index assignments for battery system 2 to 16 . 64
Table 67 – Value definition . 64
Table 68 – Object description . 64
Table 69 – Entry description . 65
Table 70 – Value definition . 66
Table 71 – Object description . 66
Table 72 – Entry description . 66
Table 73 – Object description . 67
Table 74 – Entry description . 68
Table 75 – Object description . 69
Table 76 – Entry description . 69
Table 77 – Object description . 71
Table 78 – Entry description . 71
Table 79 – Object description . 72
Table 80 – Entry description . 73
Table 81 – Object description . 74
Table 82 – Entry description . 74
Table 83 – Object description . 76
Table 84 – Entry description . 76
Table 85 – Object description . 77
Table 86 – Entry description . 77
Table 87 – Object description . 79
Table 88 – Entry description . 79
Table 89 – Object description . 80
Table 90 – Entry description . 81
Table 91 – Object description . 82
Table 92 – Entry description . 82
Table 93 – Object description . 84
Table 94 – Entry description . 84
Table 95 – Object description . 85
Table 96 – Entry description . 86
Table 97 – Object description . 86
Table 98 – Entry description . 87
Table 99 – Object description . 87
Table 100 – Entry description . 88
Table 101 – Object description. 88
Table 102 – Entry description . 89
Table 103 – Object description. 89
Table 104 – Entry description . 90
Table 105 – Sub-index relation to capacity range . 90
Table 106 – Value definition. 91
Table 107 – Object description. 91

Table 108 – Entry description . 91
Table 109 – Object description. 92
Table 110 – Entry description . 92
Table 111 – Object description. 93
Table 112 – Entry description . 93
Table 113 – Value definition. 94
Table 114 – Object description. 94
Table 115 – Entry description . 94
Table 116 – Value definition. 95
Table 117 – Object description. 95
Table 118 – Entry description . 96
Table 119 – Object description. 96
Table 120 – Entry description . 97
Table 121 – Object description. 99
Table 122 – Entry description . 99
Table 123 – Object description. 102
Table 124 – Entry description . 102
Table 125 – Value definition. 103
Table 126 – Object description. 103
Table 127 – Entry description . 103
Table 128 – Value definition. 105
Table 129 – Object description. 105
Table 130 – Entry description . 106

– 8 – IEC TS 61851-3-7:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC VEHICLES CONDUCTIVE CHARGING SYSTEM –

Part 3-7: DC EV supply equipment where protection
relies on double or reinforced insulation –
Battery system communication
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC TS 61851-3-7 has been prepared by IEC technical committee 69: Electrical power/energy
transfer systems for electrically propelled road vehicles and industrial trucks. It is a Technical
Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
69/653/DTS 69/674/RVDTS
69/674A/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The following print types are used:
– requirements: in roman type;
– notes: in small roman type;
– text formatted in bold and using mixed capital and underline are used as state names
and are not to be translated.
A list of all parts in the IEC 61851 series, published under the general title Electric vehicles
conductive charging system, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 10 – IEC TS 61851-3-7:2023 © IEC 2023
INTRODUCTION
This document is published in separate parts according to the following structure:
IEC TS 61851-3-1, Electric vehicles conductive charging system – Part 3-1: DC EV supply
equipment where protection relies on double or reinforced insulation – General rules and
requirements for stationary equipment
IEC TS 61851-3-2, Electric vehicles conductive charging – Part 3-2: DC EV supply equipment
where protection relies on double or reinforced insulation – Particular requirements for portable
and mobile equipment
IEC TS 61851-3-4, Electric vehicles conductive charging system – Part 3-4: DC EV supply
equipment where protection relies on double or reinforced insulation – General definitions and
requirements for CANopen communication
IEC TS 61851-3-5, Electric vehicles conductive charging system – Part 3-5: DC EV supply
equipment where protection relies on double or reinforced insulation – Pre-defined
communication parameters and general application objects
IEC TS 61851-3-6, Electric vehicles conductive charging system – Part 3-6: DC EV supply
equipment where protection relies on double or reinforced insulation – Voltage converter unit
communication
IEC TS 61851-3-7, Electric vehicles conductive charging system – Part 3-7: DC EV supply
equipment where protection relies on double or reinforced insulation – Battery system
communication
ELECTRIC VEHICLES CONDUCTIVE CHARGING SYSTEM –

Part 3-7: DC EV supply equipment where protection
relies on double or reinforced insulation –
Battery system communication
1 Scope
This part of IEC 61851, which is a Technical Specification, applies to CANopen communication
for the conductive transfer of electric power between the supply network and an electric road
vehicle or a removable RESS or traction-battery of an electric road vehicle.
This document specifies application objects provided by the battery system.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC TS 61851-3-4:2023 Electric vehicles conductive charging system – DC EV supply
equipment where protection relies on double or reinforced insulation – General definitions and
requirements for CANopen communication
IEC TS 61851-3-5:2023 Electric vehicles conductive charging system – Part 3-5: DC EV supply
equipment where protection relies on double or reinforced insulation – Pre-defined
communication parameters and general application objects
EN 50325-4:2002, Industrial communications subsystem based on ISO 11898 (CAN) for
controller- device interfaces – Part 4: CANopen
EN 50604-1:2016, Secondary lithium batteries for light EV (electric vehicle) applications –
Part 1: General safety requirements and test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TS 61851-3-4 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

– 12 – IEC TS 61851-3-7:2023 © IEC 2023
4 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in
IEC TS 61851-3-4 and the following apply:
Ag silver
AGM absorbent glass mat
Al aluminium
Cd cadmium
Fe iron
Li lithium
MeO metal oxide
Ni nickel
Ni-MH nickel metal hydride
SOC state of charge
SOH state of health
TiO titanium oxide
Zn zinc
5 Operating principles
5.1 General
In addition to the finite state automaton (FSA) defined by 9.1 of IEC TS 61851-3-4:2023, this
document defines an additional battery system specific FSA to operate batteries in a common
way. Any battery system supports the mandatory FSA states. State transitions within the FSA
are based on device internal events (e.g. occurrence of device errors) or on the reception of
the FSA control word.
5.2 Battery system specific FSA
The battery system specific FSA as defined in Figure 1 shall start with the initial entry in the
EMS FSA state Disconnected and shall exist as long as the EMS FSA is not left.
The FSA defines the application behaviour of the battery system (see also Table 1). The battery
system shall ensure safety by providing independent local control according to
EN 50604-1:2016 (even when the CAN network is not working properly). The NMT slave FSA
as defined in EN 50325-4:2002, the EMS FSA and the battery system FSA are coupled in the
following way: a state change in any of the involved FSAs may trigger state changes in the
other FSAs.
For state transitions (numbers in Figure 1), see Table 2.

Figure 1 – FSA for battery system
5.3 State definitions
The FSA for battery systems as shown in Figure 1 shall provide the following states with the
described state behaviour in Table 1 and state transitions in Table 2.
NOTE 1 States refer to removable and non-removable battery systems.
NOTE 2 "Detached" does not mean "removable".
Table 1 – States behaviour
Name Behaviour
Initial Pseudo state indicating the activation of the FSA
Detached Battery system is not connected to the power circuit
Do_Not_Attach Battery system may be configured and is not prepared to be connected to the power
circuit
Ready_To_Attach Battery system is prepared and ready to be attached to the power circuit.
Attached Battery system is connected to the power circuit
Normal_Operations Battery system is operating on the power circuit
Please_Detach Battery system indicates itself that it requires to be disconnected from the power circuit
(e.g. because the battery system operates no longer within the operating limits).
The battery system is in an error condition. There is no power transferred. See also
Error
Clause 7 of IEC TS 61851-3-4:2023.
Final Pseudo state, indicating the deactivation of the FSA

5.4 Transitions in the FSA for battery systems
The FSA for battery systems shall support the transitions as given in Table 2.

– 14 – IEC TS 61851-3-7:2023 © IEC 2023
Table 2 – Transitions, events and actions
Transition Event(s) Action(s)
1 Automatic transition on initial entry to EMS FSA Update status word
In case the internal conditions of the battery system allow an
2 Update status word
attachment to the power circuit, the VC FSA shall enter the state
Ready_To_Attach.
3 In case it is no longer safe to be attached, state Do_Not_Attach Update status word
shall be reached through this state transition
4 This state transition shall be only possible either in EMS FSA state Update status word
Operating or Masterless_Operating.
In EMS FSA state Operating, this state transition shall be triggered
via remote command.
In EMS FSA state Masterless_Operating, this state transition shall
be triggered by means of local events.
5, 9, 11 In case of an interna
...