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Power distribution method and device for power battery of electric vehicle, and electric vehicle

A technology of power battery and distribution method, which is applied in battery circuit devices, electric vehicles, circuit devices, etc., and can solve problems such as being difficult to be detected

Inactive Publication Date: 2019-06-14
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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. An electric vehicle power battery, and a power distribution method and device for the electric vehicle power battery, and the electric vehicle

Method used

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  • Power distribution method and device for power battery of electric vehicle, and electric vehicle
  • Power distribution method and device for power battery of electric vehicle, and electric vehicle
  • Power distribution method and device for power battery of electric vehicle, and electric vehicle

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Embodiment 1

[0086] This embodiment provides a power distribution method for electric vehicle power batteries, wherein the structure of the electric vehicle power battery is as follows 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 .

[0087] 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 ba...

Embodiment 2

[0140] This embodiment provides a power distribution device for a power battery of an electric vehicle, wherein the structure of the power battery of an electric vehicle is as follows 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 .

[0141] Power distribution devices such as Figure 7 As shown, it includes: a number judgment unit 1 , a first current determination unit 2 , a second current determination unit 3 , a total output power determination unit 4 , and a power reduction unit 5 . in:

[0142] The number judging unit 1 is used for judging the number of series-connected battery packs currently in working state.

[0143] The first current determination unit 2 is connected with the number judging unit 1, and ...

Embodiment 3

[0167] This embodiment provides an electric vehicle, including a power battery of the electric vehicle, the power battery of the electric vehicle includes: at least two sets of battery packs in series, each of the battery packs in series includes a plurality of single cells and at least one controllable switch, The plurality of single cells are connected in series with the at least one controllable switch and connected in parallel between the series battery packs.

[0168] The electric vehicle also includes the power distribution device in Embodiment 2, which is used for power distribution of the power battery of the electric vehicle.

[0169] In the electric vehicle in this embodiment, the output power of the power battery of the electric vehicle is controlled through the power distribution device. The corresponding power allocation method is determined according to the actual working state of the power battery of the electric vehicle during the operation of the vehicle, whic...

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Abstract

The invention provides a power distribution method and device of an electric vehicle power battery and an electric vehicle. The electric vehicle power battery comprises at least two series-connected battery groups in parallel. The power distribution method comprises a step of judging the number of the series-connected battery groups in a working state at present, a step of determining the maximum total discharging current of the electric vehicle power battery according to the maximum discharging current of a series-connected battery group in a working state at present if the number of the series-connected battery groups in a working state at present is one, a step of determining the maximum total discharging current of the electric vehicle power battery according to a condition whether the discharging between the series-connected battery groups in a working state at present is balanced and the maximum discharging current of the series-connected battery group whose actual discharging current exceeds a limit most easily in all series-connected battery groups in a working state at present if the number of the series-connected battery groups in a working state at present is larger than two, and a step of determining the total output power of the electric vehicle power battery according to the maximum total discharging current. The power distribution is reasonable.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a power distribution method and device for power batteries of electric vehicles and electric vehicles. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 赵祥日闫丽娟
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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