A lithium ion battery capacity sorting method

A lithium-ion battery, charging capacity technology, applied in secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problem of long capacity sorting time

Active Publication Date: 2017-05-10
ZHENGZHOU BAK BATTERY CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Based on this, it is necessary to provide a lithium-ion battery capacity sorting method to solve the problem of long capacity sorting ti

Method used

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  • A lithium ion battery capacity sorting method
  • A lithium ion battery capacity sorting method
  • A lithium ion battery capacity sorting method

Examples

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Embodiment Construction

[0023] In order to more clearly explain the lithium ion battery capacity sorting method provided by the present invention, the following specific description will be made in conjunction with the examples. figure 1 It is a flowchart of a lithium ion battery capacity sorting method according to an embodiment.

[0024] Such as figure 1 Shown, lithium-ion battery capacity sorting method comprises the following steps:

[0025] S110 , charging the lithium-ion battery at a constant current and constant voltage for the first time. Wherein, constant current charging is performed with the first charging current and charged to the first voltage, and then constant voltage charging is performed and the charging is stopped when the charging current decreases to the first cut-off current.

[0026] Specifically, in order to ensure that the lithium-ion battery forms a stable SEI film (solid electrolyte interface, solid electrolyte interface film) during formation, the first charging current ...

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Abstract

The invention relates to a lithium ion battery capacity sorting method. The method includes subjecting a lithium ion battery to a first time of constant-current constant-voltage charging until reaching a first voltage and a first cutoff current; subjecting the lithium ion battery to a second time of constant-current constant-voltage charging until reaching a second voltage and a second cutoff current, with the second voltage being greater than the first voltage and being less than or equal to the charging final voltage of the lithium ion battery; acquiring the charging capacity obtained from a charging process in which the charging current of the lithium ion battery turns from the first cutoff current to the second cutoff current; and subjecting the lithium ion battery to capacity sorting according to the charging capacity. The method can perform battery capacity sorting on the lithium ion battery only by charging the lithium ion battery. Compared with traditional capacity sorting methods, the method avoids steps of discharging and a plurality of times charging and discharging, thus reducing the capacity sorting time and increasing the production efficiency.

Description

technical field [0001] The invention relates to the field of lithium-ion battery manufacturing, in particular to a capacity sorting method for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and long charge and discharge life, so they are widely used in products in many fields such as electronic products, portable small appliances, and energy storage systems. [0003] In the production process of lithium-ion batteries, it is necessary to evaluate the actual capacity of lithium-ion batteries, so as to sort out lithium-ion batteries with unqualified actual capacities. In the traditional lithium-ion battery capacity sorting method, the most widely used method is to obtain the discharge capacity by charging and discharging the lithium-ion battery many times, and then determine whether the actual capacity of the lithium-ion battery is qualified according to the discharge capacity. The charging...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 吴保明张同富
Owner ZHENGZHOU BAK BATTERY CO LTD
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