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Electric vehicle power battery, control method and device thereof, and electric vehicle

A technology of power battery and control method, which is applied in the direction of electric vehicles, electric devices, battery/battery traction, etc., can solve the problems that the faulty battery pack cannot be removed and is difficult to be detected, so as to improve the efficiency and accuracy of fault detection rate effect

Inactive Publication Date: 2019-07-23
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that it is difficult to be detected when a single battery in the power battery fails in the prior art, so as to provide a system that can be detected in time when a single battery fails. Electric vehicle power battery, control method and device thereof, and electric vehicle
[0006] Another technical problem to be solved by the present invention is to overcome the defect that the faulty battery pack in the power battery cannot be removed in the prior art, so as to provide an electric vehicle power battery capable of removing the faulty battery pack and its control method, device and electric car

Method used

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  • Electric vehicle power battery, control method and device thereof, and electric vehicle
  • Electric vehicle power battery, control method and device thereof, and electric vehicle
  • Electric vehicle power battery, control method and device thereof, and electric vehicle

Examples

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Embodiment 1

[0058] This embodiment provides an electric vehicle power battery, such as figure 2 As shown, it includes: at least two sets of battery packs in series, each battery pack in series includes multiple single cells and at least one controllable switch, multiple single cells are connected in series with at least one controllable switch; the battery packs in series are connected in parallel .

[0059] Specifically, the controllable switch can use a high-voltage contactor, which can accurately and conveniently realize the above-mentioned functions of the controllable switch. The electric vehicle power battery in this embodiment is connected in series first and then in parallel. Therefore, when a single battery in a series battery pack fails, the current corresponding to the series battery pack and the single battery in the series battery pack are collected. The voltage of the single battery and the voltage of the series battery pack can be detected in time which series battery pac...

Embodiment 2

[0067] This embodiment provides a control method for the power battery of an electric vehicle in Embodiment 1, such as Figure 5 shown, including the following steps:

[0068] S1. Detect whether there is a faulty series battery pack in the power battery of the electric vehicle.

[0069] Preferably, as Figure 6 As shown, step S1 includes:

[0070] S11. Obtain the current of each series battery group in the electric vehicle power battery, the first voltage of each single battery, and the second voltage of each series series battery group. Specifically, the current of each series-connected battery group can be collected by connecting a current sensor in series with each series-connected battery group, and the first voltage of each single battery and the second voltage of each series-connected battery group can be obtained by using a voltage sensor.

[0071] S12. According to the current, the first voltage and the second voltage, it is judged whether the corresponding battery ...

Embodiment 3

[0081] This embodiment provides a control device for the power battery of an electric vehicle in Embodiment 1, such as Figure 8 As shown, it includes: a detection unit 1 and a disconnection unit 2; wherein the detection unit 1 is used to detect whether there is a faulty series battery pack in the power battery of the electric vehicle; the disconnection unit 2 is connected to the detection unit 1 for When the detection unit 1 detects that there is a faulty series-connected battery pack, it disconnects the faulty series-connected battery pack from other parallel-connected series-connected battery packs.

[0082] Preferably, the detection unit 1 includes:

[0083] The obtaining subunit 11 is used to obtain the current of each series-connected battery pack in the electric vehicle power battery, the first voltage of each single battery and the second voltage of each series-connected battery pack. In a specific application, the acquisition subunit 11 may include devices such as cu...

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Abstract

The invention provides an electric vehicle power battery, a control method and device thereof and an electric vehicle. The electric vehicle power battery comprises at least two series battery packs. Each series battery pack comprises a plurality of single batteries and at least one controllable switch which is in series connection with the single batteries. The series battery packs are in parallel connection. When the single batteries in one series battery pack fail, the failed batter pack can be rapidly detected by collecting the current corresponding to the series battery packs, the voltages of the single batteries in the series battery packs and the voltage of the series battery packs, the failure detection efficiency of a battery management system is improved, and the accuracy rate of the battery management system is increased. When it is detected that the batteries fail, the failed batteries can be rapidly removed, and the other batteries are protected, and harm is prevented from enlarging; and meanwhile, the state of the power battery is evaluated, the function of the power battery is restored by decreasing the power, and accordingly the vehicle can temporarily restore power.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to an electric vehicle power battery, a control method and device thereof, and an electric vehicle. Background technique [0002] There are various disadvantages in the currently commonly used fuel vehicles. Statistics show that under the conditions of more than 80% of the roads, a fuel vehicle only uses 40% of its power potential, and it will drop to 25% in urban areas. More serious It is the emission of waste gas that pollutes the environment. Since the 1990s, countries all over the world have been calling for improving the environment, and various electric vehicles have come to the fore, such as electric cars, electric trains, and electric bicycles. Although it is generally believed that the future is dominated by electric vehicles, battery technology issues have hindered the application of electric vehicles. [0003] The structure of the battery management system in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L50/64B60L3/00
CPCY02T10/70
Inventor 赵祥日闫丽娟
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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