Providing Information Guideline ofin-vehicle battery performanceVer. 1.0

June 1st, 2020
Council for Electrified Vehicle Society
Ministry of Economy Trade and Industry

Table of contents
I．Introduction ...................................................................................................................... 3
II. Definition of the topic ...................................................................................................... 3
1.

Purpose ....................................................................................................................... 3

2.

Outline of the Guideline ............................................................................................ 4

III. Examples ......................................................................................................................... 4IV. Future prospect ............................................................................................................... 5

I．Introduction
In July 2018, the Ministry of Economy, Trade and Industry (METI) released aninterim report by Strategic Meeting for the New Era of Automobiles. The reportencourages the Japanese automakers to develop its technology so that “it can reachthe highest level of environmental performance in the world” and that “it can reduce
80% Greenhouse Gas emission per vehicle – 90% per passenger vehicle”, which maylead to contribution to achieve the ultimate goal, “Well-to-Wheel Zero Emission”. As
part of efforts to pursue the goals, this Guideline provide the fundamental
approaches and examples of basic methods to indicate remaining performance oflithium ion battery (LIB) for electrified vehicles.
Regarding remaining performance of LIB for electrified vehicles, mainly two issues
has been pointed out. First, different battery manufacturers have different
structures, cell types, cathode/anode materials and/or exterior materials forelectrified vehicle’s LIB. It may cause so different and various character of remaining
performance of LIB that single unique indication method for the remaining
performance of LIB. Second, strict standardization how to indicate the remaining
performance may impede the competition for development of control systems ofautomotive battery among automakers because strict standardization force
automotive manufacture disclose the information of control systems of automotive
battery, which allows automakers to have competitive edge. Paying attention to
those issues, this Guideline exemplify basic methods to indicate the remaining
performance which is being used and assumed today. However, since the trend of
related technology continues to change, the Guideline shall be reviewed and updated
accordingly. It is necessary to note that the Guideline do not intend to eliminate
products which indicate the remaining performance based on methods other thanthe ones introduced in this Guideline.

II. Definition of the topic
1. Purpose
The Guideline are designed to facilitate automakers to provide the basic methods
which enable users to know remaining performance of LIB, so that users can get rid
of excessive anxiety over battery degradation and re-sale values of EVs (Electricvehicle) and PHVs (Plug-in Hybrid Electric vehicle) can be evaluated properly. The
approaches in the Guideline will also be applied to create the automotive battery
reuse and repurposing markets in future.

2. Outline of the Guideline
The fundamental justifications to the general basic methods to indicate theremaining performance (hereinafter called “basic methods”) are as follows:
The basic methods shall (1) present initial performance of electrified vehicles
and (2) help users understand objectively how much performance the vehicles
maintain compared to their initial performance. To be more specific, certified
specification or specification in the catalogue such as all-electric driving range
or battery capacity shall be used to indicate how much performance thevehicles still preserve.

Regarding reliability of the indications of the remaining performance, anappropriate procedures should be developed. The objectivity of indication
should be proved by third party institutions.

There are two styles how to indicate the remaining performance – indication basedon all-electric driving range and the one based on the measurement of the battery
capacity. Both shows how much performance the vehicles have maintain against theinitial values (certified specification / specification in the catalogue).
Remaining performance can be indicated on an instrument panel, smartphone, or
displayed on the dedicated tool through On-Board Diagnostics (OBD) port uponrequest of users. Besides, the direct measurement of the battery performance itself
with a other measurement instrument, which is not mounted on vehicles, can also
be one of the options considering users’ convenience.

III. Examples
1. Case 1. Indication of remaining performance based on all-electric
driving range① This method provides how much proportion of all-electric driving range an EV
and PHV maintain against the range referred to in catalogue. *1 *2② The Remaining performance is measured by using Electronic Control Unit invehicles.
③ The Remaining performance through Vehicle diagnostic tools shall be indicatedon this tool, the instrumental panels, or the portable information terminals suchas smartphones upon request of users.
④ The Remaining performance is indicated in 10% increments.

2. Case 2. Indication of the remaining performance based on the batterycapacity (in vehicle*3)① This method provides how much proportion of the battery capacity preserved in

an EV and PHV against the capacity referred to in the catalogue. *4 *5② The Remaining performance is measured by using Electronic Control Unit invehicles.

③ The Remaining performance through Vehicle diagnostic tools shall be indicatedon this tool, the instrumental panels, or the portable information terminals suchas smartphones upon request of users.

④ The Remaining performance is indicated in 10% increments.
Note 1: Since the energy consumption of heavy-duty vehicles varies depending on
pay load and those equipment, the indication of remaining performance forheavy-duty vehicles may fit battery capacity indication method (Case 1)
rather than all-electric driving range method (Case 2).
Note 2: The Guideline will cover a case of two wheel vehicles after their specification
is determined.

IV．Future prospect
The purpose of this Guideline is to help users know the battery degradation in anobjective manner. As the first step of the action, it is preferable for automakers toadopt the system of indication of the remaining performance based on theGuideline onto new-model cars which will be manufactured after 2022. The next
step of the action is to create automotive battery reuse markets. To achieve, maincurrent challenges up for discussion are as follows below.
Registering a port number used to indicate remaining performance via OBD
port to SAE/ISOThe verification process for third party institutions might be developed in thefuture. Developing the standard level of allowance/accuracy of indication

Acknowledge the Guideline to users and relevant parties of vehicles and reuse
and repurposing LIB market
Council for Electrified Vehicle Society will discuss above challenges and promote

standardization of indication method and alignment with international standard.
The Guideline will be revised around 2022. The examples of heavy-duty vehicles
and two wheel vehicles considering sales of those vehicles also considered as well.

*1 Catalogue specs of all-electric driving range are confirmed by national institutions
when a vehicle obtains a type-approval certificate.
*2 The following method can be assumed to verify reliability of indication. A
verification scheme for third party institutions may be developed in future.
1) Verifier drives a car and checks all-electric driving range following
procedures required to obtain the national type-approval certificate.
2) Verifier assesses reliability of indication by comparing the all-electric
driving range which the car actually traveled and catalogue specs.
*3 The following method can also be applied to measure and indicate battery capacity
other than measuring batteries in vehicle.
1) Remaining performance of LIB is measured by dealers and others using
measurement instruments which are not mounted on vehicles.
2) Remaining performance of LIB is presented to users utilizing output datafrom these measurement instruments.
*4 Catalogue specs of battery capacity are not confirmed by national institutions whena vehicle obtains a type-approval certificate.
*5 The following method can be assumed to verify reliability of indication. Averification scheme for third party institutions may be developed in future.
1) The automaker discloses a measurement method of battery capacity
referred to in catalogue to third party institutions.
2) Battery capacity is measured by the similar measurement method with 1)3) Reliability of indication is verified by comparing results of the measurement
2) and catalogue specs.