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A kind of volume compensation method

A compensation method and a capacity-dividing technology, applied in the field of capacity-dividing compensation, can solve the problems of cell capacity deviation, false high capacity, low capacity, etc., and achieve the effect of low cost, high cost efficiency, and low cost.

Active Publication Date: 2021-03-26
DONGGUAN LIWINON ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, the customer's requirement is the capacity data in a stable constant temperature environment of 25°C, while the environment of the capacity separation test process in the production process of polymer lithium-ion batteries is dynamic, generally under the condition of 25±5°C Therefore, the normal production test shows that the battery capacity has a large deviation from the customer's requirements. When the temperature is low, there will be a low capacity phenomenon, and when the temperature is high, the capacity will be falsely high. This is the current polymer lithium-ion battery production. The problem that has been bothering

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  • A kind of volume compensation method
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  • A kind of volume compensation method

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Experimental program
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Effect test

Embodiment 1

[0019] The present embodiment provides a capacity-division compensation method, which includes the following steps:

[0020] Step 1: Test the discharge capacity of the cells of the same system under different temperature environments, and use a mathematical model to perform nonlinear fitting between the test temperature and the discharge capacity of the cells, and the formula is as follows:

[0021] C 容量 =C 实测容量 +K 1 *(T 实测 -25) 3 +K 2 *(T 实测 -25) 2 +K 3 *T 实测 +B

[0022] Among them, C 容量 is the discharge compensation capacity, in mAh; C 实测容量 is the actual discharge capacity, in mAh; K 1 , K 2 and K 3 are compensation coefficients; T 实测 is the compensation temperature value; B is the offset coefficient;

[0023] Step 2, in the process of dividing the capacity test, record the discharge starting voltage, discharge current, discharge temperature and actual discharge capacity, select the average value of the discharge temperature as the compensation temperature va...

Embodiment 2

[0026] The present embodiment provides a capacity-division compensation method, which includes the following steps:

[0027] Step 1: Test the discharge capacity of the cells of the same system under different temperature environments, and use a mathematical model to perform nonlinear fitting between the test temperature and the discharge capacity of the cells, and the formula is as follows:

[0028] C 容量 =C 实测容量 +K 1 *(T 实测 -25) 3 +K 2 *(T 实测 -25) 2 +K 3 *T 实测 +B

[0029] Among them, C 容量 is the discharge compensation capacity, in mAh; C 实测容量 is the actual discharge capacity, in mAh; K 1 , K 2 and K 3 are compensation coefficients; T 实测 is the compensation temperature value; B is the offset coefficient;

[0030] Step 2, in the process of dividing the capacity test, record the discharge starting voltage, discharge current, discharge temperature and actual discharge capacity, select the average value of the discharge temperature as the compensation temperature va...

Embodiment 3

[0033] The present embodiment provides a capacity-division compensation method, which includes the following steps:

[0034] Step 1: Test the discharge capacity of the cells of the same system under different temperature environments, and use a mathematical model to perform nonlinear fitting between the test temperature and the discharge capacity of the cells, and the formula is as follows:

[0035] C 容量 =C 实测容量 +K 1 *(T 实测 -25) 3 +K 2 *(T 实测 -25) 2 +K 3 *T 实测 +B

[0036] Among them, C 容量 is the discharge compensation capacity, in mAh; C 实测容量 is the actual discharge capacity, in mAh; K 1 , K 2 and K 3 are compensation coefficients; T 实测 is the compensation temperature value; B is the offset coefficient;

[0037] Step 2, in the process of dividing the capacity test, record the discharge starting voltage, discharge current, discharge temperature and actual discharge capacity, select the average value of the discharge temperature as the compensation temperature va...

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Abstract

The invention belongs to the field of automatic manufacturing of lithium ion batteries and particularly relates to a capacity grading compensation method which comprises the following steps: performing battery cell capacity grading, at the same time monitoring and testing an ambient temperature, synchronously recording voltages and current of a battery cell in capacity grading, and compensating according to a capacity and temperature fitting curve till a capacity in an environment required by a customer, so as to effectively reducing the problems that testing conditions required by customers and manufacturers are not accordant. In addition, by adopting the method provided by the invention, automatic compensation can be achieved from local testing equipment to an MES (Manufacturing Execution System) simultaneously, by barcode tracing can be achieved, and the method is low in cost and high in efficiency.

Description

technical field [0001] The invention belongs to the field of automatic manufacturing technology of lithium ion batteries, and in particular relates to a capacity division compensation method. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various fields such as electronic products due to their high energy density, high voltage, high cycle, high safety, and green environmental protection. Among them, after the lithium-ion battery is completed, in order to verify the quality and performance of the product battery and further clear the Li + The transmission path between the positive and negative electrodes improves the cycle performance during the later use of the battery and ensures the safety performance of the product after leaving the factory. The lithium-ion battery needs to be charged and discharged several times before leaving the factory. ". [0003] Generally, the customer's requirement is the capacity data of the capaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/4285H01M10/446Y02E60/10
Inventor 梁光照陈劲松郑明清龙世隆王威李载波杨山
Owner DONGGUAN LIWINON ENERGY TECH