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Lithium ion battery group matching method

A lithium-ion battery and battery technology, which is applied in the field of lithium-ion batteries, can solve the problems of inability to guarantee the performance of battery modules, low accuracy, inconsistency, etc., so as to improve and improve the quality of the assembly, good performance, safety and efficiency. effect used

Active Publication Date: 2015-05-13
中国南方电网有限责任公司调峰调频发电公司 +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This matching method does not match the actual use status, the accuracy is low, and the performance of the battery module cannot be guaranteed.

Method used

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  • Lithium ion battery group matching method

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Embodiment Construction

[0023] The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0024] As shown in Figure 1, the lithium-ion battery assembly method of the embodiment of the present invention includes the following steps:

[0025] Step S1, discharging a plurality of lithium-ion batteries to a cut-off voltage, and then allowing the plurality of lithium-ion batteries to stand still for a first predetermined time. Since the lithium-ion battery stores a certain amount of electricity when it is placed, the electricity stored in the lithium-ion battery can be discharged through this step. The first predetermined time is preferably 10-20 minutes, further, the first predetermined time is preferably 10 minutes.

[0026] Step S2, charging a plurality of said lithium-ion batteries to a cut-off voltage ...

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Abstract

The invention relates to a lithium ion battery group matching method, which includes: S1. subjecting a plurality of lithium ion batteries to electric discharge to cut-off voltage, and then performing standing; S2. conducting constant current charging on the plurality of lithium ion batteries to cut-off voltage, recording the charging capacity C1, the charging mean voltage V1 and the first voltage change value delta E1 before and after charging, and then conducting laying; S3. Performing constant-current discharge on the plurality of lithium ion batteries to cut-off voltage, measuring the discharge capacity C2, the discharge mean voltage V2 and the second voltage change value delta E2 before and after discharge, and then conducting laying; S4. conducting charging on the plurality of lithium ion batteries, then performing laying, and measuring the voltage drop delta V and internal resistance R; and S5. according to C1, V1, delta E1, C2, V2, delta E2, delta V and R, carrying out group matching based on grading standards. Through the lithium ion battery group matching method provided by the invention, group matching can better coincide with the actual state, and the use performance of a battery module can be better, thereby realizing safe and efficient use of the battery module.

Description

technical field [0001] The invention relates to lithium ion batteries, in particular to a lithium ion battery assembly method. Background technique [0002] With the impact of the global energy and environmental crisis becoming more and more serious, lithium-ion batteries are increasingly used in energy storage stations and electric vehicles due to their excellent performance. In order to achieve the applicable voltage and capacity, it is inevitable that the battery needs to Expand and boost through parallel and series connections. The difference in the consistency of the same module battery will cause the performance of the single battery to not be fully utilized, thereby affecting the performance of the module battery and even causing safety problems. In order to keep the batteries of the same module in good consistency, it is necessary to examine the different characteristics of different batteries before assembly to ensure the consistency of batteries in the same module...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCY02E60/10
Inventor 郭海峰张百华陈满李勇琦霍健权蔡惠群詹世英李海军陈晓龙严章术马美品魏银仓
Owner 中国南方电网有限责任公司调峰调频发电公司
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