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Power battery group consistency detection method and device

A technology of a power battery pack and a detection method, which is applied in the direction of measuring devices, measuring electricity, and measuring electric variables, etc., and can solve problems such as the inability to reflect the voltage distribution of a single cell

Inactive Publication Date: 2015-05-13
POTEVIO NEW ENERGY VEHICLE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing battery management technology can only reflect the difference between the highest cell voltage and the lowest cell voltage in the entire battery pack, but cannot reflect the distribution of all cell voltages, the present invention further proposes a power Battery pack consistency detection method and device

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  • Power battery group consistency detection method and device
  • Power battery group consistency detection method and device

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Embodiment 1

[0092] The power battery pack in this embodiment uses a lithium iron phosphate power battery, the nominal voltage of the single battery is 3.20V, and the nominal capacity is 66Ah. The basic parameters of the power battery system are shown in Table 1:

[0093] Table 1

[0094] Single voltage / V 3.20 Monomer capacity / Ah 66 Total battery voltage / V 339.2 Total battery capacity / Ah 66 Total battery capacity / kWh 22.38 Grouping 1P106S

[0095] The power battery pack includes 106 single cells, which are v1~v106 respectively. Under the preset ambient temperature of 25°C, use a discharge device to discharge the power battery pack at a constant current discharge rate of 1 / 3C until it reaches the battery management level. After the system automatically terminates the discharge, it will be still for a period of time. Because at normal temperature, the DC internal resistance of the battery is basically unchanged, and the internal resistance consistency is...

Embodiment 2

[0101] The power battery system in this embodiment uses a lithium manganese oxide power battery, the nominal voltage of the single battery is 3.60V, and the nominal capacity is 90Ah. The basic parameters of the power battery system are shown in Table 3:

[0102] table 3

[0103] Single voltage / V 3.60 Monomer capacity / Ah 90 Total battery voltage / V 374.4 Total battery capacity / Ah 360 Total battery capacity / kWh 134.78 Grouping 4P104S

[0104] The power battery pack includes 104 single cells, which are v1~v104 respectively. Under the preset ambient temperature of 25°C, the discharge device is used to discharge the battery pack at a constant current discharge rate of 1 / 3C until it reaches the automatic discharge rate of the battery management system. Terminate the discharge and stand still for a period of time. Then use the charging device to charge the battery pack with a constant current at a charging rate of 1 / 3C. When the total voltage reac...

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Abstract

The invention provides a power battery group consistency detection method and device and belongs to the technical field of power batteries. The power battery group consistency detection method comprises obtaining any one of the extreme voltage deviation and the extreme voltage relative deviation of every battery monomer and the voltage standard deviation of every battery monomer in the discharging process of a power battery group and performing comparison on a combination of any one or more than one of the extreme voltage deviation and the extreme voltage relative deviation of every battery monomer and a voltage standard value of every battery monomer and a threshold value so as to detect the consistency of the power battery group, wherein every battery monomer is arranged in the power battery group. According to the power battery group consistency detection method and device, any one of the extreme voltage deviation and the extreme voltage relative deviation of every battery monomer arranged in the power battery group and the voltage standard value of every battery monomer serve as parameters and accordingly the internal difference among batteries can be effectively expressed and the comparison is performed on the corresponding parameters and the threshold value so as to detect the consistency of the power battery group and accordingly the operation is simple and convenient, the detection process is stable and reliable, and the evaluation result is accurate.

Description

technical field [0001] The invention relates to a method and device for detecting the consistency of a power battery pack, belonging to the technical field of power batteries. Background technique [0002] Due to the limitations of power battery capacity and terminal voltage, in the application of power batteries used in electric vehicles, it is usually necessary to combine multiple batteries in series and parallel to achieve higher voltage and larger capacity. However, due to the highly non-linear characteristics of batteries, and the differences in manufacturing process, material, usage environment, and connection methods among many batteries in a battery pack, it is inevitable that there will be inconsistencies in capacity, terminal voltage, and internal resistance among individual batteries. Therefore, during the long-term charge and discharge process of the electric vehicle power battery pack, due to the difference in charge acceptance capacity, self-discharge rate, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 张红昌牟其勇赵迎宾
Owner POTEVIO NEW ENERGY VEHICLE TECH
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