CN-122008952-A - SOC correction method, device, equipment and storage medium of power battery

Abstract

The application discloses a method, a device, equipment and a storage medium for correcting the SOC of a power battery, which relate to the technical field of battery correction and comprise the steps of detecting whether a current correction strategy is full charge correction or full discharge correction when the power battery triggers the SOC correction; and when the current correction strategy is not the full charge correction and the full discharge correction, acquiring current SOC (state of charge) zone bit data, and correcting the SOC of the power battery according to the current SOC zone bit data and the current correction strategy. By acquiring the current SOC zone bit data and according to the SOC zone bit and the current correction strategy, accurate correction of the SOC of the power battery can be realized, so that correction errors of the maximum SOC and the minimum SOC of the power battery are reduced, and charging and discharging performance and safety are improved.

Inventors

• TAN FANG
• Lv Lingya

Assignees

• 东风汽车有限公司东风日产乘用车公司

Dates

Publication Date

20260512

Application Date

20260209

Claims (10)

1. 1. The SOC correction method of the power battery is characterized by comprising the following steps of: detecting whether the current correction strategy is full charge correction or full discharge correction when the power battery triggers SOC correction; Acquiring current SOC (state of charge) marker bit data when the current correction strategy is not the full charge correction and the full discharge correction; and correcting the SOC of the power battery according to the current SOC flag bit data and the current correction strategy.
2. 2. The method of claim 1, wherein the step of correcting the SOC of the power battery based on the current SOC flag data and the current correction strategy comprises: obtaining a current maximum SOC (state of charge) zone bit and a current minimum SOC zone bit according to the current SOC zone bit data; Obtaining a maximum SOC correction target and a minimum SOC correction target according to the current correction strategy; and correcting the current maximum SOC and the current minimum SOC of the power battery according to the current maximum SOC flag bit, the current minimum SOC flag bit, the maximum SOC correction target and the minimum SOC correction target.
3. 3. The method of claim 2, wherein the step of correcting the current maximum SOC and the current minimum SOC of the power battery according to the current maximum SOC flag, the current minimum SOC flag, the maximum SOC correction target, and the minimum SOC correction target comprises: When the current maximum SOC flag bit and the current minimum SOC flag bit are both the first preset value, correcting the current maximum SOC to be the maximum SOC correction target, and correcting the current minimum SOC to be the minimum SOC correction target.
4. 4. The method of claim 2, wherein the step of correcting the current maximum SOC and the current minimum SOC of the power battery according to the current maximum SOC flag, the current minimum SOC flag, the maximum SOC correction target, and the minimum SOC correction target comprises: When the current maximum SOC flag bit is a first preset value and the current minimum SOC flag bit is a second preset value, correcting the current maximum SOC to be the maximum SOC correction target, wherein the first preset value is smaller than the second preset value; Comparing the current minimum SOC with the minimum SOC correction target; and when the current minimum SOC is greater than or equal to the minimum SOC correction target, correcting the current minimum SOC to the minimum SOC correction target.
5. 5. The method of claim 1, wherein prior to the step of correcting the SOC of the power battery based on the SOC flag data and the current correction strategy, further comprising: acquiring SOC accumulated charge-discharge integration, wherein the SOC accumulated charge-discharge integration comprises a maximum SOC accumulated charge-discharge integration and a minimum SOC accumulated charge-discharge integration; When the SOC accumulated charge-discharge integral is smaller than a preset battery capacity threshold value, executing a step of correcting the SOC of the power battery according to the current SOC flag bit data and the current correction strategy; when the SOC accumulated charge-discharge integral is larger than or equal to a preset battery core capacity threshold value, determining whether a first preset value exists in the current SOC flag bit data; when the first preset value does not exist in the current SOC zone bit data, setting the current maximum SOC zone bit or the current minimum SOC zone bit in the current SOC zone bit data as the first preset value, and executing the step of correcting the SOC of the power battery according to the current SOC zone bit data and the current correction strategy.
6. 6. The method of claim 5, wherein the method further comprises: Acquiring the power-down dormancy time of the vehicle; When the vehicle power-down dormancy time is greater than or equal to a preset time threshold, setting the zone bit values in the current SOC zone bit data to be first preset values, and setting the SOC accumulated charge-discharge integral to be a preset battery core capacity threshold.
7. 7. The method according to any one of claims 1 to 6, characterized in that, after the step of detecting whether the current correction strategy is a full charge correction or a full discharge correction when the power battery triggers the SOC correction, further comprising: When the current correction strategy is full charge correction, correcting the current maximum SOC of the power battery to a first target value, setting the current maximum SOC marker bit to a second preset value, and carrying out ampere-hour integration on the maximum SOC accumulated charge and discharge to obtain a maximum SOC accumulated charge and discharge integral; And when the current correction strategy is full discharge correction, correcting the current minimum SOC of the power battery to a second target value, setting the current minimum SOC marker bit to a second preset value, and carrying out time-dependent integration on the minimum SOC accumulated charge and discharge to obtain a minimum SOC accumulated charge and discharge integral, wherein the first target value is larger than the second target value.
8. 8. An SOC correction apparatus for a power battery, the apparatus comprising: the detection module is used for detecting whether the current correction strategy is full charge correction or full discharge correction when the power battery triggers SOC correction; The acquisition module is used for acquiring current SOC (state of charge) marker bit data when the current correction strategy is not the full charge correction and the full discharge correction; And the correction module is used for correcting the SOC of the power battery according to the current SOC flag bit data and the current correction strategy.
9. 9. An SOC correction apparatus for a power battery, characterized in that the apparatus comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the SOC correction method for a power battery as claimed in any of claims 1 to 7.
10. 10. A storage medium, characterized in that the storage medium is a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the SOC correction method of a power battery according to any one of claims 1 to 7.

Description

SOC correction method, device, equipment and storage medium of power battery Technical Field The present application relates to the field of battery correction technologies, and in particular, to a method, an apparatus, a device, and a storage medium for correcting SOC of a power battery. Background The existing battery pack for the new energy automobile generally consists of a plurality of battery cells, but due to the problems of initial parameter difference, inconsistent aging degree, inconsistent temperature distribution and the like among the battery cells, inconsistent State of Charge (SOC) among the battery cells is easy to occur after long-term operation. If the SOC value used in the charging and discharging process of the battery pack cannot accurately reflect the inconsistency of the SOCs among the battery cells, part of the battery cells can be in an overcharged or overdischarged state for a long time, so that the aging of the battery pack is accelerated, and the overall service life of the battery pack is influenced. In performing the battery uniformity correction, the inconsistency of the SOC between the battery cells is characterized by calculating the maximum SOC and the minimum SOC in the battery pack respectively. In terms of SOC correction strategies, for example, OCV correction, full charge correction, full discharge correction, and correction methods based on battery models, the maximum SOC and the minimum SOC of the battery pack are calibrated and corrected based on the maximum voltage and the minimum voltage of the individual battery cells, respectively. However, when the consistency of the battery cells is poor, the current correction strategy cannot fully reflect the SOC difference of the battery cells, and errors are introduced during correction, so that the correction of the SOC is not accurate enough. Disclosure of Invention The application mainly aims to provide an SOC correction method, device, equipment and storage medium of a power battery, and aims to solve the technical problem that the SOC correction is inaccurate due to errors introduced during the current SOC consistency correction. In order to achieve the above object, the present application provides a method for correcting SOC of a power battery, the method for correcting SOC of a power battery comprising: detecting whether the current correction strategy is full charge correction or full discharge correction when the power battery triggers SOC correction; Acquiring current SOC (state of charge) marker bit data when the current correction strategy is not the full charge correction and the full discharge correction; and correcting the SOC of the power battery according to the current SOC flag bit data and the current correction strategy. In an embodiment, the step of correcting the SOC of the power battery according to the current SOC flag data and the current correction strategy includes: obtaining a current maximum SOC (state of charge) zone bit and a current minimum SOC zone bit according to the current SOC zone bit data; Obtaining a maximum SOC correction target and a minimum SOC correction target according to the current correction strategy; and correcting the current maximum SOC and the current minimum SOC of the power battery according to the current maximum SOC flag bit, the current minimum SOC flag bit, the maximum SOC correction target and the minimum SOC correction target. In an embodiment, the step of correcting the current maximum SOC and the current minimum SOC of the power battery according to the current maximum SOC flag bit, the current minimum SOC flag bit, the maximum SOC correction target, and the minimum SOC correction target includes: When the current maximum SOC flag bit and the current minimum SOC flag bit are both the first preset value, correcting the current maximum SOC to be the maximum SOC correction target, and correcting the current minimum SOC to be the minimum SOC correction target. In an embodiment, the step of correcting the current maximum SOC and the current minimum SOC of the power battery according to the current maximum SOC flag bit, the current minimum SOC flag bit, the maximum SOC correction target, and the minimum SOC correction target includes: When the current maximum SOC flag bit is a first preset value and the current minimum SOC flag bit is a second preset value, correcting the current maximum SOC to be the maximum SOC correction target, wherein the first preset value is smaller than the second preset value; Comparing the current minimum SOC with the minimum SOC correction target; and when the current minimum SOC is greater than or equal to the minimum SOC correction target, correcting the current minimum SOC to the minimum SOC correction target. In an embodiment, before the step of correcting the SOC of the power battery according to the SOC flag bit data and the current correction strategy, the method further includes: acquiring SOC accumulated charge-discharge integrati