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Test method and test system for battery pack capacity consistency

A test method and battery pack technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as battery pack capacity consistency testing, and achieve the effect of improving subsequent cycle life and preparing for testing

Active Publication Date: 2021-06-29
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing mass-produced battery pack capacity test method is generally based on the ampere-hour integral formula, but it does not test the consistency of the battery pack capacity

Method used

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  • Test method and test system for battery pack capacity consistency
  • Test method and test system for battery pack capacity consistency
  • Test method and test system for battery pack capacity consistency

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Embodiment Construction

[0037] It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0038] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0039] Before introducing the technical solution of the present invention, the relationship between the cell capacity and the charge and discharge cut-off voltage is described. Assuming that the capacity of a single cell is a fixed value, the charge and discharge cut-off voltage and capacity consistency determine the available capacity of the battery pack (such as figure 1 shown). The offset of the charge and discharge cut-off voltage of each cell inside the battery pack is negatively correlated with the available capacity of the battery pack: the greater the offset of the charge and discharge cut-off voltage, the smaller the available capacity of the battery pack; the charge and ...

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PUM

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Abstract

The invention relates to the technical field of batteries, and provides a test method and a test system for the capacity consistency of battery packs. The test method for the capacity consistency of the battery pack according to the present invention includes: when the voltage of any battery cell in the battery pack reaches the preset charging cut-off voltage, stop charging, and collect the first preset time before stopping charging The charging voltage of each battery cell; when the voltage of any battery cell reaches the preset discharge cut-off voltage, stop discharging, and collect the discharge voltage of each battery cell at the second preset moment before stopping discharging; based on the charging voltage of each battery cell , discharge voltage, respectively calculate the charge cut-off voltage offset and discharge cut-off voltage offset of the battery pack; and determine that the capacity consistency of the battery pack is qualified when both the charge and discharge cut-off voltage offsets belong to the preset defective rate range. The invention can accurately test the consistency of the capacity of the battery pack, thereby improving the subsequent cycle life of the entire battery pack.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a test method and a test system for the capacity consistency of battery packs. Background technique [0002] Capacity is one of the important performance indicators of power batteries. A single battery cell will be tested for capacity at the factory. Due to inconsistencies in materials, processes and environments, the capacity of the battery cells will vary. Therefore, before the single cell leaves the factory, the cell capacity will be graded according to a certain control line, and the cells of the same grade can be assembled into a battery pack. The subsequent cycle life of a battery pack with good cell capacity consistency is longer than that of a battery pack with poor consistency. . [0003] The existing mass-produced battery pack capacity testing method is generally based on the ampere-hour integral formula, but it does not test the consistency of the battery pack capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/396G01R31/388
CPCG01R31/388G01R31/396
Inventor 贾智军阳飞魏海潮李勇郭佳文
Owner SVOLT ENERGY TECHNOLOGY CO LTD