SE547110C2 - Method for determining a battery cell having the lowest battery capacity in a battery cell module - Google Patents
Method for determining a battery cell having the lowest battery capacity in a battery cell moduleInfo
- Publication number
- SE547110C2 SE547110C2 SE2150286A SE2150286A SE547110C2 SE 547110 C2 SE547110 C2 SE 547110C2 SE 2150286 A SE2150286 A SE 2150286A SE 2150286 A SE2150286 A SE 2150286A SE 547110 C2 SE547110 C2 SE 547110C2
- Authority
- SE
- Sweden
- Prior art keywords
- battery cell
- battery
- value
- state
- voltage limitation
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention is related to a method (100) for determining which battery cell among a plurality of battery cells in a battery cell module (200) has the lowest battery capacity. If an error margin of an estimated state-of-charge window value is smaller than or equal to an error threshold value, the battery cell having the largest estimated state-of-charge window value is determined to have the lowest battery capacity in the battery cell module (200); else the battery cell having the largest accumulated voltage limitation value is determined to have the lowest battery capacity in the battery cell module (200). Once determined the battery cell with the lowest battery capacity can be used to compute the battery capacity of the battery cell module (200), thereby saving computational resources.
Claims (12)
1. A method (100) for determining which battery cell among a plurality of battery cells in a battery cell module (200) having the lowest battery capacity, the method (100) comprising: estimating (102) a state-of-charge window value for each battery cell (202) in the battery cell module (200), wherein the state-of-charge window value for the battery cell (202) is estimated as a difference between a highest state-of-charge value the battery cell reaches during a charging cycle and a lowest state-of-charge value the battery reaches during a discharge cycle for the battery cell (202), determining an error margin of the estimated state-of-charge window values indicating how much an actual state-of-charge window value may potentially differfrom the estimated state-of-charge window value, and if the error margin of an estimated state-of-charge window value is smaller than or equal to an error threshold value, determining (104) a battery cell among the plurality of battery cells having the largest estimated state-of-charge window value as the battery cell having the lowest battery capacity in the battery cell module (200); else, counting (106) for each battery cell (202) in the battery cell module (200) an accumulated voltage limitation value, wherein the accumulated voltage limitation value indicates a number of times a battery voltage of the battery cell exceeds a higher voltage limitation threshold value and/or subceeds a lower voltage limitation value, and determining (108) a battery cell among the plurality of battery cells having the largest accumulated voltage limitation value as the battery cell having the lowest battery capacity in the battery cell module (200).
2. The method (100) according to claim 1, wherein the method (100) further comprises: estimating the state-of-charge window value for each battery cell (202) at a rate dependent on a charging and a discharging cycle of the battery cell module (200).
3. The method (100) according to any one of the preceding claims, wherein the higher voltage limitation threshold value and the lower voltage limitation threshold value is lO dependent on a state-of-charge value and a temperature of the battery cell module (200).
4. The method (100) according to any one of the preceding claims, wherein the higher voltage limitation threshold value and the lower voltage limitation threshold value is dependent on a charging and/or discharging operation of the battery cell module (200).
5. The method (100) according to any one of claims 1 to 4, wherein the method (100) further comprises: obtaining the higher voltage limitation threshold value and/or the lower voltage limitation threshold value as pre-computed values.
6. The method (100) according to any one of claims 1 to 4, wherein the method (100) further comprises: computing the higher voltage limitation threshold value and/or the lower voltage limitation threshold value.
7. The method (100) according to any one of the preceding claims, wherein the battery cells in the battery cell module (200) are serially coupled with each other.
8. The method (100) according to any one of the preceding claims, wherein the method (100) further comprises: computing a battery capacity of the battery cell determined to have the lowest battery capacity; and replacing the battery cell determined to have the lowest battery capacity if the computed battery capacity is lower than a battery capacity threshold value.
9. A control arrangement (300) for determining which battery cell among a plurality of battery cells in a battery cell module (200) having the lowest battery capacity, the control arrangement (300) being configured to: estimate a state-of-charge window value for each battery cell (202) in the battery cell module (200), wherein the state-of-charge window value for the battery cell (202) is estimated as a difference between a highest state-of-charge value the battery cell lO reaches during a charging cycle and a Iowest state-of-charge value the battery_\¿;;;j-;¿åå reaches during a discharge cycle for the battery cell (202), determine an error margin of the estimated state-of-charge window values indicating how much an actual state-of-charge window value may potentially differ from the estimated state-of-charge window value, and if the error margin of an estimated state-of-charge window value is smaller than or equal to an error threshold value: determine a battery cell among the plurality of battery cells having the largest estimated state-of-charge window value as the battery cell having the Iowest battery capacity in the battery cell module (200); else: count for each battery cell (202) in the battery cell module (200) an accumulated voltage limitation value, wherein the accumulated voltage limitation value indicates a number of times a battery voltage of the battery cell exceeds a higher voltage limitation threshold value and/or subceeds a lower voltage limitation value, and determine (108) a battery cell among the plurality of battery cells having the largest accumulated voltage limitation value as the battery cell having the Iowest battery capacity in the battery cell module (200).
10. A vehicle (400) comprising a control arrangement (300) according to claim
11. 11 _ A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method (100) according to any one of claims1 to
12. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method (100) according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2150286A SE547110C2 (en) | 2021-03-12 | 2021-03-12 | Method for determining a battery cell having the lowest battery capacity in a battery cell module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2150286A SE547110C2 (en) | 2021-03-12 | 2021-03-12 | Method for determining a battery cell having the lowest battery capacity in a battery cell module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE2150286A1 SE2150286A1 (en) | 2022-09-13 |
| SE547110C2 true SE547110C2 (en) | 2025-04-22 |
Family
ID=83507693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE2150286A SE547110C2 (en) | 2021-03-12 | 2021-03-12 | Method for determining a battery cell having the lowest battery capacity in a battery cell module |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE547110C2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013009696A1 (en) * | 2011-07-14 | 2013-01-17 | Southwest Electronic Energy Group | Short detection in battery cells |
| US10809306B2 (en) * | 2017-05-23 | 2020-10-20 | Audi Ag | Method for checking a battery state and an apparatus for checking a battery state using voltage differences |
| EP3726235A1 (en) * | 2017-12-13 | 2020-10-21 | Sumitomo Electric Industries, Ltd. | Battery monitoring device, computer program, and battery monitoring method |
-
2021
- 2021-03-12 SE SE2150286A patent/SE547110C2/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013009696A1 (en) * | 2011-07-14 | 2013-01-17 | Southwest Electronic Energy Group | Short detection in battery cells |
| US10809306B2 (en) * | 2017-05-23 | 2020-10-20 | Audi Ag | Method for checking a battery state and an apparatus for checking a battery state using voltage differences |
| EP3726235A1 (en) * | 2017-12-13 | 2020-10-21 | Sumitomo Electric Industries, Ltd. | Battery monitoring device, computer program, and battery monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| SE2150286A1 (en) | 2022-09-13 |
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