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Combing method for lithium ion batteries

A technology of lithium-ion batteries and lithium batteries, which is applied in the field of lithium-ion batteries, can solve problems such as large differences in the voltage range of single batteries and uneven discharge of batteries

Inactive Publication Date: 2018-01-12
江苏海四达电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects in the prior art that the lithium-ion battery cells in the battery pack are discharged with a large current, the voltage range difference of the single cells is large, and the battery discharge is uneven, the present invention provides a method that improves the discharge of lithium-ion batteries. Consistent battery matching method

Method used

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  • Combing method for lithium ion batteries
  • Combing method for lithium ion batteries
  • Combing method for lithium ion batteries

Examples

Experimental program
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Embodiment 1

[0081] In this implementation case, a 2000mAh ternary power battery is selected as the lithium-ion single battery, and the module combination uses a combination of 1 parallel and 6 strings. The specific assembly steps are as follows:

[0082] S1: Discharge 10 lithium-ion single cells to 2.75V at a current of 0.8A, and then discharge them at a current of 0.15A to 2.75V after leaving them aside for 10 minutes;

[0083] S2: After completing step S1, put the lithium-ion battery on hold for 30 minutes, charge it to 4.2V with a constant current and constant voltage of 1A, and record the first charging capacity C 1 , calculate the first charging capacity range ΔC of 10 lithium-ion battery cells 1 24mAh;

[0084] S3: The extreme difference of the first charging capacity is within the predetermined range of 30mAh, so lithium-ion battery cells 1 to 10 all enter the next step;

[0085] S4: After completing step S3, put the lithium-ion battery on hold for 10 minutes, discharge it to 2.7...

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Abstract

The invention relates to the technical field of lithium ion batteries, and specifically relates to a combing method for lithium ion batteries. The combining method for the lithium ion battery comprises the following steps: carrying out repeated charging and discharging on a plurality of lithium ion batteries under different charging and discharging conditions, measuring and calculating charging capacity range, discharging capacity range, open-circuit voltage, self-discharge value and the internal resistance of the batteries in the charging and discharging process, screening the lithium ion batteries, and combining the lithium ion batteries meeting conditions so as to form a battery pack. Screening for combining conditions is carried out on the lithium ion batteries under different electricquantities, so that the voltage electrode range of the single lithium ion batteries at the tail end moment of high-current discharging fro the single lithium ion batteries in the same group after screening is small, and the discharging uniformity of the lithium ion batteries is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery assembly method. Background technique [0002] As a new energy technology, lithium-ion batteries are more and more widely used in daily life, involving aerospace, mobile base station energy storage, power tools, small appliances, smart homes, digital 3C, electric vehicles and other fields. In the research and development of lithium-ion batteries, people have higher and higher requirements for the mass specific energy, volume specific energy, rate performance, high and low temperature discharge performance, cycle life, self-discharge and other performance of single lithium ions; but in practical applications in various fields Single lithium-ion batteries are often used in groups. The performance of lithium-ion battery packs is not only closely related to the performance of single batteries, but also affected by the consistency of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 沈晓彦袁琦罡顾海英夏树强张磊赵凯斐
Owner 江苏海四达电源有限公司
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