Method for detecting consistency of single battery in storage battery

A single cell, battery pack technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of changes, only focus on the consistency of the previous single battery, and ignore the consistency of the battery, etc., to achieve consistency performance guarantee, fast data processing, and improved consistency problems

Inactive Publication Date: 2017-05-31
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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Problems solved by technology

[0006] In order to solve the existing manufacturing process of battery modules, only focus on the consistency sorting of single cells before production and the selection and matching of battery modules, but ignore the problem of the change of battery consistency inside the battery after the battery module is assembled. The invention proposes a method for detecting the consistency of single cells in a battery pack

Method used

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  • Method for detecting consistency of single battery in storage battery
  • Method for detecting consistency of single battery in storage battery
  • Method for detecting consistency of single battery in storage battery

Examples

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Embodiment 1

[0048] In the following, the present invention will be further described in conjunction with the description of the quality inspection of the 48V storage battery module.

[0049] A 48V battery system used in the start-stop system of automobiles. The intermediate product 48V battery module in the production process is composed of 13 single power batteries connected in series by laser welding. The 48V battery module testing equipment has the functions of collecting single batteries and performing consistency analysis and judgment. The testing fixtures are as follows: figure 1 shown.

[0050] The battery modules connected in parallel are regarded as a single battery. There are 7 connectors at one end of the module and 7 connectors at the other end. After connecting with the charging and discharging instrument, 13 sets of voltage curves can be measured, such as figure 2. The original picture is in color, showing the voltage curves (V1...~V13) of each single battery and the vol...

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Abstract

The invention provides a method for detecting consistency of a single battery in storage battery. The method comprises the following steps: forming the storage battery by serially and / or parallelly connecting multiple single batteries; and in the discharging process of the storage battery, to obtain one or more of the data of the voltage range of each single battery in the storage battery, the voltage relative range and the voltage standard deviation of each single battery, and comparing the obtained statistics value for expressing the consistency of the single battery in the storage battery with the threshold value, and dynamically detecting the consistency of the storage battery in the quality testing process. The provided method is capable of, through setting the different charging-discharging systems in the quality testing process, detecting the consistency level of the internal single battery in the storage battery under the appointed use conditions. Through the quality testing by the system, the expression data of the consistency of the storage battery out of a factory is more convincing, and the consistency of the actual vehicle-mounted using process is more effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of electrical performance testing, and in particular relates to a testing method for a battery pack. Background technique [0002] 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 capacity decay rate among the individual cells in the battery pack, it may cause the The real-time voltage distribution is uneven and tends to diverge, which will easily lead to increased discreteness of the batteries inside the battery pack and increased performance degradation of individual batteries, which will lead to the failure of the entire battery pack, which will affect the reliability of the entire battery system. [0003] 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 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/396
Inventor 邹春龙唐海波付垚胡博
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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