Capacity grading compensation method

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

Active Publication Date: 2018-07-24
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

Method used

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Examples

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Comparison scheme
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Embodiment 1

[0019] This embodiment provides a capacity division compensation method, including the following steps:

[0020] Step 1: Under different temperature environments, test the discharge capacity of the same system cell, and use a mathematical model to perform nonlinear fitting between the test temperature and discharge capacity of the cell, 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 Both are compensation coefficients; T 实测 is the compensation temperature value; B is the offset coefficient;

[0023] Step 2: During the capacity separation test, record the initial discharge voltage, discharge current, discharge temperature and actual discharge capacity, select the average value of the discharge temperature as the compensation temperature value, and set the compensation co...

Embodiment 2

[0026] This embodiment provides a capacity division compensation method, including the following steps:

[0027] Step 1: Under different temperature environments, test the discharge capacity of the same system cell, and use a mathematical model to perform nonlinear fitting between the test temperature and discharge capacity of the cell, 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 Both are compensation coefficients; T 实测 is the compensation temperature value; B is the offset coefficient;

[0030] Step 2: During the capacity separation test, record the initial discharge voltage, discharge current, discharge temperature and actual discharge capacity, select the average value of the discharge temperature as the compensation temperature value, and set the compensation co...

Embodiment 3

[0033] This embodiment provides a capacity division compensation method, including the following steps:

[0034] Step 1: Under different temperature environments, test the discharge capacity of the same system cell, and use a mathematical model to perform nonlinear fitting between the test temperature and discharge capacity of the cell, 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 Both are compensation coefficients; T 实测 is the compensation temperature value; B is the offset coefficient;

[0037] Step 2: During the capacity separation test, record the initial discharge voltage, discharge current, discharge temperature and actual discharge capacity, select the average value of the discharge temperature as the compensation temperature value, and set the compensation co...

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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 environmental protection. Among them, after the lithium-ion battery is manufactured, in order to verify the quality and performance of the product battery and further dredge the Li + The transmission path between the positive and negative electrodes improves the cycle performance of the battery in the later use process and ensures the safety performance of the product after leaving the factory. Before leaving the factory, the lithium-ion battery needs to be charged and discharged several times. This process is called "capacity separation". ". [0003] Generally, the customer...

Claims

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Application Information

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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
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