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Method for judging uniformity of all batteries of lithium ion battery pack and timing voltage measuring instrument

A lithium-ion battery pack, timing measurement technology, applied in the direction of measuring current/voltage, measuring electricity, measuring electrical variables, etc., can solve the problems of insecure customer interests, high time cost, inconvenient capacity separation, aging batteries, etc. Achieve the effect of reducing production cost, improving quality, saving labor and material resources

Active Publication Date: 2014-07-02
GUANGZHOU FULLRIVER BATTERY NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the manufacturing process of lithium-ion batteries, methods such as capacity division and aging are used to select the capacity and self-consumption of the batteries, but they can only be controlled within a certain range; there may be misjudgments caused by personnel or equipment abnormalities during the manufacturing process. At the same time, the battery also has dynamic changes. The process of combining cells into a battery pack may also change under external influences (such as pressure). Whether the completed battery pack can meet the design or the agreed shelf life with the customer can only be known by the actual use of the customer. In this way, the time cost is very high, and the interests of the customer are not guaranteed.

Method used

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  • Method for judging uniformity of all batteries of lithium ion battery pack and timing voltage measuring instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: figure 1 It is the principle diagram of the timing measuring voltmeter. The timing measuring voltmeter includes a charger module 01, a control conversion circuit module 02, a battery pack module to be measured 03, a timing time setting module 04, a central processing unit 05, a voltage stabilizing circuit module 06, a DC12V power supply module 07, and an output module 08. The central processing unit is a CPU. The central processing unit 05 is respectively connected with the timing setting module 04 , the output module 08 and the control conversion circuit module 02 . The timing time setting module 04 is used to set the time required for the voltage to stabilize after the discharge of the battery pack; the output module 08 performs data output or derivation; the control conversion circuit module 02 is used to receive the central processing unit The 05 instruction makes the battery pack to be measured switch between charging and voltage measurement modes, and...

Embodiment 2

[0039] Example 2: The 11585135Fe type soft-packaged lithium iron phosphate lithium ion 2P15S battery pack produced by our company has a nominal voltage of 48V (3.2V*15), a rated capacity of 20Ah, and the battery pack consists of 30 3.2V10Ah11585135Fe type soft-packaged lithium iron phosphate batteries And then 15 series combination.

[0040] The battery pack is tested according to the method of the present invention, and the specific operations are as follows:

[0041] (1) Processing and assembly of lithium-ion batteries: First, aging the battery cells according to the company's patent application number 201210094387.2, and the battery capacity and voltage are graded; secondly, according to the company's patent application number 201110186716.1 Matching group, and combined into a battery pack;

[0042] (2) Discharge: For the detected capacity of the assembled battery pack, the battery pack is charged to 50V, and then discharged to over-discharge protection, and the battery pa...

Embodiment 3

[0051] Example 3: The 26650Fe cylindrical steel case lithium iron phosphate lithium ion 3P5S battery produced by our company has a nominal voltage of 16V (3.2V*5) and a rated capacity of 9.9Ah. The battery pack is composed of 15 3.2V3.3Ah26650Fe cylindrical steel-cased lithium iron phosphate cells, first 3 and then 5 in series. According to customer requirements, the state of charge of the battery pack is 60% when it is shipped; the quality level of the battery pack is judged according to the method of the present invention, and the specific operations are as follows:

[0052] (1) Discharge: According to the customer's use conditions, the battery pack is discharged to BMS protection at a constant current of 0.2C, and connected to a timing measuring voltmeter before discharge;

[0053] (2) Measure the rebound voltage:

[0054] (3) Consistency judgment: According to the calculation formula of the rebound voltage regression equation established by our company, the rebound voltag...

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Abstract

The invention discloses a method for judging the uniformity of all batteries of a lithium ion battery pack and a timing voltage measuring instrument. The method comprises the following steps that (1) the lithium ion battery pack is discharged; (2) rebounce voltages of the lithium ion battery pack are measured; (3) the total voltage value of the lithium ion battery pack measured by the timing voltage measuring instrument in the step (2) is compared with lithium ion battery pack rebounce voltage values obtained through a lithium ion battery pack rebounce voltage standard calculation formula created in the method, if the total voltage value of the lithium ion battery pack is within the range of the lithium ion battery pack rebounce voltage values, the uniformity of all the batteries in the lithium ion battery pack is good, and otherwise it shows that the uniformity of the batteries in the lithium ion battery pack is poor. According to the method, production cost is lowered, labor and material resources are saved, and the quality of the lithium ion battery pack is improved. Meanwhile, the timing voltage measuring instrument is capable of measuring the total voltage of the discharged and settled lithium ion battery pack, also capable of activating the lithium ion battery pack with a BMS and easy to operate, and improves production efficiency.

Description

technical field [0001] The invention belongs to the field of lithium secondary batteries, and in particular relates to a method for judging the consistency of each battery cell in a lithium ion battery pack and a timing measuring voltmeter. Background technique [0002] The consistency level of each battery cell in a lithium-ion battery pack determines the shelf life of the battery pack during transportation and storage, as well as the capacity performance during use. The consistency of the cells in the battery pack is mainly manifested in the voltage difference between the cells in the battery pack. When the voltage difference between the cells in the battery pack reaches a certain level, the performance of the battery pack will decline, such as reduced capacity and shortened discharge time. may cause the battery pack to fail. [0003] The voltage difference between the cells of the battery pack is an inevitable phenomenon. The technical parameters such as the self-consump...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R19/00
Inventor 曾小平唐胜成王庆远段军
Owner GUANGZHOU FULLRIVER BATTERY NEW TECH
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