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Battery pack fault detection circuit and battery pack fault detection method

A fault detection circuit and fault detection technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as weak applicability and inability to detect

Pending Publication Date: 2022-04-08
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this method can only detect faults when the battery pack is in the charging state, and cannot detect when the battery pack is in the power supply state, so the applicability is weak

Method used

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  • Battery pack fault detection circuit and battery pack fault detection method
  • Battery pack fault detection circuit and battery pack fault detection method
  • Battery pack fault detection circuit and battery pack fault detection method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0087] An embodiment of the present application provides a battery pack failure detection circuit, which will be described in detail below with reference to the accompanying drawings.

[0088] see image 3 , which is a schematic diagram of a battery pack fault detection circuit provided in an embodiment of the present application.

[0089] The battery pack failure detection circuit 200 is connected to the battery pack 100, and the battery pack 100 includes a plurality of battery modules 110 connected in series. Each battery module 110 includes one or more battery cells.

[0090] When the battery module 101 includes multiple batteries, the multiple batteries can be connected in parallel inside the battery module 101, or connected in series first and then connected in parallel inside the battery module 101, or connected in parallel first and then connected in series inside the battery module 101, The embodiment of the present application does not limit the specific quantity an...

Embodiment 2

[0115] First, the principle of fault detection using the variation of the difference between the output voltage and the average output voltage will be described below.

[0116] see Figure 5 , which is a schematic voltage relationship curve provided by the embodiment of the present application.

[0117] Taking the number of battery modules greater than 2 as an example, in the figure, waveform V1 represents the output voltage waveform corresponding to battery module 1, V2 represents the output voltage waveform corresponding to battery module 2, and Vavg represents the average output of all battery modules voltage waveform.

[0118] Any two adjacent sampling moments in the figure are separated by Δt.

[0119] Waveform V2 is selected for illustration below.

[0120] When at the first preset time t 1 When , the difference between the output voltage of the battery module 2 and the average output voltage is:

[0121] ΔV 1 =V2(t 1 )-Vavg(t 1 ) (1)

[0122] At the second pres...

Embodiment 3

[0173] Another implementation of the battery pack fault detection circuit will be described below.

[0174] see Figure 7 , which is another schematic voltage relationship curve provided by the embodiment of the present application.

[0175] The controller may also determine whether the i-th battery module is faulty according to the variation of the output voltage of the i-th battery module, which will be described in detail below.

[0176] Next, continue to select the waveform V2 for illustration, and any two adjacent sampling moments in the figure are separated by Δt.

[0177] When at the first preset time t 1 When , the output voltage of battery module 2 is V2(t 1 ).

[0178] When at the second preset time t2, the output voltage of the battery module 2 is V2(t 2 ).

[0179] Then the change amount ΔV of the output voltage determined by the difference at the preset time of t1 and the preset time of t2 1 'as follows:

[0180] ΔV 1 ’=V2(t 1 )-V2(t 2 ) (15)

[0181] ...

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Abstract

The invention provides a battery pack fault detection circuit, a fault detection method, a power supply system and an electric vehicle, and relates to the technical field of battery safety. The battery pack comprises k battery modules which are connected in series, each battery module comprises at least one battery cell, and k is an integer greater than 1. The detection circuit comprises a sampling circuit and a controller. The sampling circuit samples the output voltage of each battery module and sends a sampling result to the controller; whenever the controller determines that the average output voltage of the k battery modules is within a preset voltage range by using the sampling result, the controller determines whether the ith battery module has a fault according to the variable quantity of the output voltage of the ith battery module, or obtains a difference value between the output voltage of the ith battery module and the average output voltage, and determining whether the ith battery module has a fault or not according to the variable quantity of the difference value, i = 1, 2,..., k. According to the scheme, fault detection can be carried out when the battery pack is charged or discharged, and the applicability is high.

Description

technical field [0001] The present application relates to the technical field of battery safety, and in particular to a battery pack fault detection circuit, a fault detection method, a power supply system and an electric vehicle. Background technique [0002] At present, the energy density of battery packs used in electronic equipment, energy storage systems, electric vehicles and other fields is increasing continuously. By detecting the faults of battery packs, the probability of safety accidents can be reduced. [0003] Among them, the internal short circuit detection of the battery pack is an important part of the fault detection. A battery pack generally includes multiple cells (Cells). The internal short circuit refers to the connection between the positive and negative electrodes of the cells that cannot be disconnected by the battery management system (BMS) through resistance, which will cause overcurrent in the battery pack. Even overheating, leading to fire or exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385
Inventor 段永康刘兵晓杨瑞莫维
Owner HUAWEI DIGITAL POWER TECH CO LTD