# US 12,181,533 B2 · Method and device for determining available capacity of battery, management system, and storage medium

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- Number: US 12,181,533 B2
- Document ID: US12181533B2
- Status: Granted
- Kind: B2
- Application number: 18/170,412
- Filed: 2023-02-16
- Published: 2023-06-29
- Granted: 2024-12-31
- Earliest claimed: 2019-04-25
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology (HONG KONG) LIMITED
- Inventors: Jian Ruan; Mingshu Du; Shenzhi Tang; Shichao Li; Yanhua Lu; Wei Zhang
- Web page: https://patentgrep.com/patent/US12181533B2

## CPC

- G01R 31/387: Determining ampere-hour charge capacity or SoC
- G01R 31/392: Determining battery ageing or deterioration, e.g. state of health
- G01R 31/3648: {comprising digital calculation means, e.g. for performing an algorithm}
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H02J 7/82: Control of state of charge [SOC]
- G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- H01M 2010/4278: {Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller}
- Y02E 60/10: Energy storage using batteries
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A method and device for determining an available capacity of a battery, a battery management system, and a storage medium, relating to the field of battery technologies. The method includes: obtaining the at least one DOD interval corresponding to the SOC interval of the operation of the battery, and the number of cycles and the cycle temperature corresponding to the at least one DOD interval; obtaining a recoverable amount of capacity fade of the battery according to the at least one DOD interval, the number of cycles and the cycle temperature, and determining an actual available capacity of the battery.

## Claims

### Claim 1

A method for determining an available capacity of a battery, executed by a processor located in a device for determining the available capacity of a battery, comprising:
collecting a first State of Charge (SOC) of the battery before the battery is charged and a second SOC of the battery after the battery is charged;
determining a State of Charge (SOC) interval of the battery based on the first SOC of the battery before the battery is charged and the second SOC of the battery after the battery is charged;
determining at least one Depth of Discharge (DOD) interval set in the SOC interval based on setting information, wherein the DOD interval is an SOC operation interval set in an SOC usage interval which is 0 to 100%;
determining a number of cycles and a cycle temperature of the battery in the at least one DOD interval, wherein the number of cycles is a number of cycle operations of the battery in one DOD interval, and wherein the cycle temperature is a battery temperature at which the battery operates in one DOD interval;
determining an interval recoverable amount of capacity fade of the battery based on correspondence information between an interval recoverable amount of capacity fade, and the at least one DOD interval, the number of cycles and the cycle temperature in the at least one DOD interval, wherein the correspondence information is calibrated by performing an operating condition cycle test to test the recoverable amount of capacity fade corresponding to different DOD intervals, different numbers of cycles and different cycle temperatures, and wherein the correspondence information comprises a functional relation, a table, or a model;
determining a first single recoverable amount of capacity fade of the battery in a current operation by adding a plurality of interval recoverable amounts of capacity fade;
determining a second single recoverable amount of capacity fade of the battery in the last operation;
determining the recoverable amount of capacity fade of the battery under the current operating condition by performing a weighted calculation on the second single recoverable amount of capacity fade and the first single recoverable amount of capacity fade; and
correcting an actual available capacity of the battery based on the recoverable amount of capacity fade of the battery.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the recoverable amount of capacity fade of the battery under the current operating condition is Dnew=α1D1+α2D2, where D1 is the second single recoverable amount of capacity fade, D2 is the first single recoverable amount of capacity fade, α1 and α2 are weight values, and a numerical range of α1 and α2 is [−1, 1].

### Claim 3 (depends on 1)

The method according to claim 1, wherein correcting an actual available capacity of the battery based on the recoverable amount of capacity fade comprises:
calculating a first available capacity of the battery by linear interpolation of an accumulated ampere-hour value based on battery operation data;
calculating the actual available capacity of the battery by adding the first available capacity to the recoverable amount of capacity fade; and
obtaining a state of health of the battery based on the actual available capacity.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising:
under the condition that the recoverable amount of capacity fade is greater than or equal to a preset threshold, determining that the recoverable amount of capacity fade of the battery needs to be eliminated.

### Claim 5 (depends on 4)

The method according to claim 4, further comprising:
under the condition that the recoverable amount of capacity fade is greater than or equal to a preset threshold, performing N full charge and full discharge cycle operations on the battery according to the number of times of charging and discharging, to eliminate the recoverable amount of capacity attenuation of the battery, wherein N is the number of charge and discharge cycles required to eliminate the capacity fade under the current recoverable amount of capacity fade measured by the experiments.