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Method and device for determining self-discharge of battery pack

A determination method and technology for determining the device, which are applied in the field of battery pack self-discharge determination and battery pack self-discharge determination device field, can solve problems such as affecting product performance, inaccurate self-discharge rate, and ignoring temperature changes, and improve The effect of self-discharge rate and good performance

Pending Publication Date: 2022-05-27
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method does not take into account the influence of temperature changes during the charge and discharge process, and does not eliminate the error caused by this factor, so the self-discharge rate obtained by the test will be inaccurate
[0005] However, as an important indicator of battery performance, self-discharge has strict indicator requirements in terms of battery design verification, product verification, and shipping requirements. If self-discharge cannot be accurately tested, it will affect product performance and even affect to customer use

Method used

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  • Method and device for determining self-discharge of battery pack
  • Method and device for determining self-discharge of battery pack

Examples

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Embodiment 1

[0044] The present embodiment relates to a method of determining the self-discharge of the battery pack, such as Figure 1 As shown, the method as a whole includes the following steps:

[0045] Step 1: Obtain the discharge capacity C of the battery pack at room temperature 0 ；

[0046] Step 2: According to the obtained discharge capacity C 0 , the battery pack is discharged in stages to obtain the discharge capacity C at each stage n , the discharge operation of each stage of the battery pack is carried out at room temperature;

[0047] Step 3: After charging the battery pack, at room temperature, the battery pack is static, discharged in stages to obtain the actual discharge capacity C at each stage m ；

[0048] Step 4: According to the discharge capacitance C at each stage n and the actual discharge capacitance C at each stage m to obtain the self-discharge rate of the battery pack.

[0049] Based on the above overall measurement ideas, this method preferentially adopts a segment...

Embodiment 2

[0061] The present embodiment relates to a battery pack self-discharge determinant apparatus, Figure 2 An exemplary system configuration of the determining apparatus is shown.

[0062] The determining apparatus comprises an acquisition module 1 and a computing module 2. Wherein, the acquisition module 1 is used to obtain the discharge capacity C of the battery pack at room temperature 0 3. Discharge capacity C at each stage n , and the actual discharge capacity C at each stage m 。 Calculation module 2 is used to base the discharge capacitance C at each stage n and the actual discharge capacitance C at each stage m to obtain the self-discharge rate of the battery pack.

[0063] The above-described acquisition module 1 may be a set of inspection instruments for measuring the capacitance of the battery pack discharge point, with reference to the determination method of the battery pack self-discharge provided in Example I, the battery pack is detected in each step to obtain C 0 、C n ...

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Abstract

The invention provides a method and a device for determining self-discharge of a battery pack. The method for determining the self-discharge of the battery pack comprises the following steps: firstly, obtaining the discharge capacity C0 of the battery pack at room temperature; according to the obtained discharge capacity C0, the battery pack is discharged in stages so as to obtain the discharge capacity Cn in each stage, and the discharge operation of each stage of the battery pack is carried out at normal temperature; after the battery pack is charged, at room temperature, the battery pack is subjected to standing and staged discharging, so that the actual discharging capacity Cm in each stage is obtained; and finally, obtaining the self-discharge rate of the battery pack according to the discharge capacity Cn in each stage and the actual discharge capacity Cm in each stage. According to the determination method, two groups of discharge capacitance measurement values are detected, and one group of measurement values is carried out after the battery pack stands and the environment adapts to the temperature, so that the influence of the temperature rise factor of the battery pack caused by discharge on the capacitance measurement error can be reduced; by means of correction calculation of two groups of data, more accurate self-discharge rate of the battery pack can be measured.

Description

Technical field [0001] The present invention relates to the field of battery testing technology, particularly to a method of determining the self-discharge of a battery pack. Further, the present invention further relates to a battery pack self-discharge device to determine. Background [0002] Due to the advantages of high energy density, long service life and high voltage, lithium-ion batteries have been widely used in the rapidly developing new energy market. However, during the storage of a battery, it is often accompanied by an attenuation of capacity, a phenomenon known as the self-discharge of the battery. In general, the self-discharge of lithium-ion batteries is divided into two types: one is the self-discharge caused by the physical micro-short circuit inside the battery, which is generally small and reversible; the other is the chemical reaction, that is, the chemical reaction between the electrolyte and the positive and negative electrodes, which is irreversible. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/387
CPCG01R31/387Y02E60/10
Inventor 王宇
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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