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Battery self discharge detection method and lithium battery sorting method

A detection method and self-discharge technology, which is applied in the battery self-discharge detection and lithium battery sorting fields, can solve problems such as safety hazards, unqualified lithium batteries, and battery failures, and achieve reliable measurement results, low measurement costs, and simple measurement steps Effect

Inactive Publication Date: 2018-05-22
SHANGHAI HUAPU AUTOMOBILE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor found that after the battery is manufactured, there will inevitably be a self-discharge problem. Self-discharge is an inherent characteristic of the battery, but excessive self-discharge is a manifestation of battery failure. The existing technology cannot solve the problem of self-discharge of lithium batteries. Accurate measurement of the discharge size, resulting in the production of unqualified lithium batteries, posing safety hazards

Method used

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  • Battery self discharge detection method and lithium battery sorting method
  • Battery self discharge detection method and lithium battery sorting method

Examples

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no. 1 example

[0030] Please refer to figure 1 , an embodiment of the present invention provides a battery self-discharge detection method for detecting the self-discharge rate of a battery to be tested. It can accurately measure the self-discharge rate of the lithium battery, has simple measurement steps, low measurement cost and reliable measurement results. The battery self-discharge detection method includes the following steps:

[0031] Step S101: Discharging the battery to be tested to 0% state of charge to form a first empty battery.

[0032] Specifically, in step S101 , the battery to be tested is initially discharged to form a preliminary empty battery; then the preliminary empty battery is deeply discharged to form a first empty battery.

[0033] It is worth noting that both the preliminary empty battery and the first empty battery still have some power remaining in the objective fact, and the electricity in the preliminary empty battery is more than that in the first empty batte...

no. 2 example

[0049] Please refer to figure 2 , The embodiment of the present invention provides a lithium battery sorting method, which is used to detect the self-discharge rate of the battery to be tested, and screen out unqualified batteries according to the self-discharge rate. It can accurately measure the self-discharge rate of the lithium battery, the measurement steps are simple, the measurement cost is low, the measurement result is reliable, and it is practical and efficient. Compared with the first embodiment, this embodiment adds a step, and the lithium battery sorting method includes the following steps:

[0050] Step S201: Discharging the battery to be tested to 0% state of charge to form a first empty battery.

[0051] Step S202: Leave the first empty battery at a first preset temperature for a first preset time period to form a second empty battery, and measure the second empty battery to obtain a first voltage.

[0052] Step S203: Leave the second empty battery at a seco...

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Abstract

The invention discloses a battery self discharge detection method and a lithium battery sorting method, which relate to the technical field of battery detection. A to-be-detected battery is dischargedto a 0% state of charge, and a first no-load battery is formed; the first no-load battery is shelved for a first preset time period under a first preset temperature, a second no-load battery is formed and first voltage is obtained; the second no-load battery is shelved for a second preset time period under a second preset temperature, a third no-load battery is formed and second voltage is obtained; and according to the first voltage, the second voltage and the second preset time period, the self discharge rate of the to-be-detected battery is calculated. In comparison with the prior art, thebattery self discharge detection method provided in the invention adopts a step of shelving the second no-load battery for the second preset time period under the second preset temperature, the firstvoltage and the second voltage can be accurately measured, the self discharge rate is calculated by using the first voltage and the second voltage, the measurement steps are simple, the measurement cost is low, and the measurement result is reliable.

Description

technical field [0001] The invention relates to the technical field of battery detection, in particular to a battery self-discharge detection method and a lithium battery sorting method. Background technique [0002] Lithium batteries are widely used in digital products, new energy vehicles, wind and solar energy storage, telecommunication base station reserve power, electric tools and electric motorcycles, etc. The performance of the battery directly affects the use effect of the terminal. The inventor found that after the battery is manufactured, there will inevitably be a self-discharge problem. Self-discharge is an inherent characteristic of the battery, but excessive self-discharge is a manifestation of battery failure. The existing technology cannot correct the self-discharge of lithium batteries. Accurate measurement of the discharge size leads to the production of unqualified lithium batteries, which poses a safety hazard. [0003] In view of this, it is particularl...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3865
Inventor 许海涛汪小云刘立明刘夺
Owner SHANGHAI HUAPU AUTOMOBILE CO LTD