CN-116872794-B - Method, device, medium and equipment for preventing power battery from being in error balance

CN116872794BCN 116872794 BCN116872794 BCN 116872794BCN-116872794-B

Abstract

The invention provides a method, a device, a medium and equipment for preventing power battery from being balanced by mistake, wherein the method comprises the steps of determining a first single battery cell which meets balanced starting conditions for the first time in the current charging process, screening a second single battery cell which does not meet the balanced starting conditions from the first single battery cell according to a voltage curve of the first single battery cell at the current charging ending time, balancing the first single battery cell except the second single battery cell at the current next charging starting time, and removing the battery cells which meet the balanced starting conditions for the first time but do not meet the balanced starting conditions at the charging ending time in the last charging process before the current starting balancing, so that the probability of generating the error balancing to the battery cells is reduced, the maintenance effect of consistency of each battery cell is improved, and the effects of releasing power and releasing energy of a battery pack are improved.

Inventors

YU ZHENHONG
BIAN ZIYONG
LIU ZONGGE
XIONG WEI
LIU ZHENYONG

Assignees

岚图汽车科技有限公司

Dates

Publication Date: 20260508
Application Date: 20230625

Claims (7)

1. A method of preventing power cell imbalance, the method comprising: in the current charging process, determining a first monomer cell which meets the balanced opening condition for the first time; At the current charging end time, screening a second single battery cell which does not meet the balanced starting condition from the first single battery cell according to the voltage curve of the first single battery cell; Equalizing the first single battery cells except the second single battery cells at the next charging start time of the current time, wherein, The determining the first monomer battery cell which meets the balanced opening condition for the first time comprises the following steps: in the current charging process, acquiring all effective monomer voltages in a battery pack and acquiring the minimum effective monomer voltage; traversing each effective single voltage, and determining a cell corresponding to the effective single voltage as a first single cell which meets the balanced starting condition for the first time if the effective single voltage is larger than a preset first voltage threshold and the voltage difference between the effective single voltage and the minimum effective single voltage is larger than a second voltage threshold; the step of screening out a second single battery cell which does not meet the balanced opening condition from the first single battery cell according to the voltage curve of the first single battery cell comprises the following steps: for a first single cell, obtaining the single voltage of the first single cell, if the single voltage of the first single cell is less than or equal to a first voltage threshold, or, When the voltage difference value between the monomer voltage of the first monomer battery cell and the minimum effective monomer voltage is less than or equal to a second voltage threshold value, determining that the first monomer battery cell does not meet a balanced starting condition; And determining the first single battery cell which does not meet the balanced opening condition as the second single battery cell.
2. The method of claim 1, wherein said obtaining all available cell voltages in the battery pack comprises: Obtaining a voltage value of each single cell; And for any single cell, if the voltage value of the single cell is in the effective voltage range, determining the voltage value of the single cell as the effective single voltage.
3. The method of claim 1, wherein the current charge end time is a time when the cell voltage reaches a preset cutoff voltage.
4. The method of claim 1, wherein equalizing the first cell except for the second cell comprises: acquiring the position numbers of the first single battery cells except the second single battery cells in a battery pack; And based on an equalization strategy, equalizing the corresponding first single battery cells according to the position numbers.
5. An apparatus for preventing power cell imbalance, the apparatus comprising: the determining unit is used for determining a first monomer cell which meets the balanced starting condition for the first time in the current charging process; The screening unit is used for screening a second single battery cell which does not meet the balanced starting condition from the first single battery cell according to the voltage curve of the first single battery cell at the current charging end time; An equalization unit for equalizing the first single battery cells except the second single battery cell at the next charging start time of the current time, The determining unit is used for: In the current charging process, acquiring all effective monomer voltages of the monomer battery cores in the battery pack and acquiring the minimum effective monomer voltage; Traversing the effective single voltage of each cell, and determining the cell corresponding to the effective single voltage as a first single cell which meets the balanced starting condition for the first time if the effective single voltage of the cell is larger than a preset first voltage threshold and the voltage difference between the effective single voltage and the minimum effective single voltage is larger than a second voltage threshold; the step of screening out a second single battery cell which does not meet the balanced opening condition from the first single battery cell according to the voltage curve of the first single battery cell comprises the following steps: for a first single cell, obtaining the single voltage of the first single cell, if the single voltage of the first single cell is less than or equal to a first voltage threshold, or, When the voltage difference value between the monomer voltage of the first monomer battery cell and the minimum effective monomer voltage is less than or equal to a second voltage threshold value, determining that the first monomer battery cell does not meet a balanced starting condition; And determining the first single battery cell which does not meet the balanced opening condition as the second single battery cell.
6. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-4.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-4 when the program is executed.

Description

Method, device, medium and equipment for preventing power battery from being in error balance Technical Field The application relates to the technical field of battery pack equalization, in particular to a method, a device, a medium and equipment for preventing power battery from being in error equalization. Background The power battery of the electric automobile is formed by connecting a plurality of single batteries in series, and when the voltage of the single batteries is large in pressure difference, namely the consistency of the single batteries is poor, the release power and the release energy of the battery pack can be influenced. Currently, in order to maintain the consistency of the single batteries, the battery pack balancing strategy is generally used to balance each single battery so as to maintain the consistency of the single batteries. However, in the prior art, the conventional equalization algorithm is unreasonable in design, and the phenomenon of misequalization of single battery cells exists, so that the effect of battery consistency cannot be ensured. Disclosure of Invention Aiming at the problems existing in the prior art, the embodiment of the invention provides a method, a device, a medium and equipment for preventing the power battery from being balanced by mistake, so as to solve or partially solve the technical problems that in the prior art, when the power battery is balanced, the single battery core is easy to be balanced by mistake, so that the consistency of the battery cannot be ensured, and the performance of the battery is influenced. In a first aspect of the present invention, there is provided a method of preventing power cell imbalance, the method comprising: in the current charging process, determining a first monomer cell which meets the balanced opening condition for the first time; At the current charging end time, screening a second single battery cell which does not meet the balanced starting condition from the first single battery cell according to the voltage curve of the first single battery cell; and at the next charging starting time of the current time, balancing the first single battery cells except the second single battery cells. In the above scheme, the first determining the first monomer battery cell satisfying the balanced opening condition includes: in the current charging process, acquiring all effective monomer voltages in a battery pack and acquiring the minimum effective monomer voltage; And traversing each effective single voltage, and determining the cell corresponding to the effective single voltage as a first single cell which meets the balanced starting condition for the first time if the effective single voltage is larger than a preset first voltage threshold and the voltage difference between the effective single voltage and the minimum effective single voltage is larger than a second voltage threshold. In the above scheme, the step of obtaining all effective cell voltages of the cell units in the battery pack includes: Obtaining a voltage value of each single cell; And for any single cell, if the voltage value of the single cell is in the effective voltage range, determining the voltage value of the single cell as the effective single voltage. In the above scheme, the current charging end time is a time when the voltage of the battery cell reaches a preset cut-off voltage. In the above scheme, the step of screening the second single battery cell which does not meet the balanced opening condition from the first single battery cell according to the voltage curve of the first single battery cell includes: for a first single cell, obtaining the single voltage of the first single cell, if the single voltage of the first single cell is less than or equal to a first voltage threshold, or, When the voltage difference value between the monomer voltage of the first monomer battery cell and the minimum effective monomer voltage is less than or equal to a second voltage threshold value, determining that the first battery cell does not meet an equilibrium starting condition; And determining the first single battery cell which does not meet the balanced opening condition as the second single battery cell. In the above scheme, the balancing the first single cell except the second single cell includes: acquiring the position numbers of the first single battery cells except the second single battery cells in a battery pack; And based on an equalization strategy, equalizing the corresponding first single battery cells according to the position numbers. In a second aspect of the present invention, there is provided an apparatus for preventing power cell imbalance, the apparatus comprising: the determining unit is used for determining a first monomer cell which meets the balanced starting condition for the first time in the current charging process; The screening unit is used for screening a second single battery cell which does not meet the balanced starting