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Method and device for measuring internal resistance of battery pack

A technology of measuring devices and measuring methods, which is applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of long time consumption and large errors, and achieve the effect of solving large measurement errors

Inactive Publication Date: 2020-01-21
云蜂数智物联网有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiments of the present application provide a method and device for measuring the internal resistance of a battery pack, which are used to solve the problems of large errors and long time-consuming measurement methods of the existing battery pack internal resistance

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  • Method and device for measuring internal resistance of battery pack
  • Method and device for measuring internal resistance of battery pack

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Embodiment 1

[0046] The embodiment of the present application provides a device for measuring the internal resistance of a battery pack, such as Figure 4 As shown, the measuring device 100 includes: M measuring units 101 and a control unit 102 are specifically:

[0047] The measuring unit 101 is used to measure the internal resistance of a battery cell. Among them, M measurement units form N groups of measurement units, N≥2, each group of measurement units includes at least one measurement unit, at least one of the N groups of measurement units includes more than two measurement units, and any two groups of measurement units measure The number of cells is equal or differs by one.

[0048] For example, assuming M=80, N=2, there are 40 measurement units in the first group of measurement units, 40 measurement units in the second group of measurement units, and the number of the first group of measurement units and the second group of measurement units are equal . Therefore, the measuring ...

Embodiment 2

[0076] An embodiment of the present application provides a measuring unit for performing the following method of measuring the internal resistance of a battery pack, such as Image 6 As shown, the measuring unit 101 includes a first receiving module, a second receiving module, a sending module and a processing module, specifically:

[0077] The first receiving module is used to receive the internal resistance measurement command sent by the control unit.

[0078] The second receiving module is configured to receive the measurement completion signal sent by the measurement unit connected in series with the measurement unit.

[0079] The sending module is used to send a measurement completion signal to the measurement unit connected in series with the measurement unit.

[0080] The processing module is used to start measurement when it is determined that the measurement unit belongs to the first group of measurement units, and after the measurement is completed, send a measurem...

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Abstract

The invention discloses a method and device for measuring the internal resistance of a battery pack, and relates to the technical field of power electronics. The device for measuring the internal resistance of the battery pack includes N sets of measuring units and a control unit, each measuring unit is used for measuring the internal resistance of one battery unit, wherein N is bigger than or equal to 2, each set of the measuring units includes at least one measuring unit, at least one of set of the N sets of measuring units includes more than two measuring units, and the number of the measuring units in any two sets of the measuring units is equal or in one-difference; the control unit is in communication connection with the N sets of measuring units, and is used for controlling the N sets of measuring units to start measuring one by one; and the measuring units in the same set start measurement at the same time, and after the measurement of one set of measuring units is completed, the next set of measuring units starts to measure until the N sets of measuring units complete the measurement. The embodiments of the method and device are applied to measure the internal resistance of the battery pack.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a method and device for measuring the internal resistance of a battery pack. Background technique [0002] Battery internal resistance is a very important parameter for judging battery performance. During the operation, maintenance and management of battery packs, it is necessary to regularly measure the internal resistance of each battery in the battery pack to evaluate the current capacity and performance of the battery. The change trend of the internal resistance value is used to predict the battery life. [0003] In the prior art, there are mainly two methods for measuring the internal resistance of a battery pack, the first is a simultaneous measurement method, and the second is a single-cell measurement method. The first method has a large measurement error, and the second method has a small measurement error, but the measurement takes too long. Conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389G01R31/392G01R31/396
CPCG01R31/389G01R31/392G01R31/396
Inventor 胡国旭郭德超
Owner 云蜂数智物联网有限公司
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