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Battery pack switching control device and method for electric vehicle

A technology for electric vehicle batteries and control devices, applied in terminal battery switching devices, battery/fuel cell control devices, electric vehicles, etc., can solve problems such as difficulty in finding charging facilities, inconvenient use, and high voltage platform of battery packs

Active Publication Date: 2016-11-16
WM MOTOR TECH GRP CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

In order to maintain the balance of the battery cells and avoid safety problems after the damage of the single cells, the battery cells in the automotive battery pack system cannot be used in parallel; therefore, this large-capacity battery system can only be formed by connecting a large number of battery cells in series.
As a result, the overall voltage platform of the battery pack is too high, which is likely to cause safety hazards
Moreover, it is difficult to find matching charging facilities for cars equipped with this battery pack system due to the high battery voltage, causing inconvenience in use

Method used

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  • Battery pack switching control device and method for electric vehicle

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Embodiment Construction

[0026] All features disclosed in this specification, or all disclosed steps in a method or process, may be combined in any way except mutually exclusive features and / or steps.

[0027] Any feature disclosed in this specification, unless expressly stated otherwise, may be replaced by other equivalent or alternative features serving a similar purpose. That is, unless expressly stated otherwise, each feature is but one example of a series of equivalent or similar features.

[0028] Description of the present invention:

[0029] 1. Two battery packs are configured on the electric vehicle, and the two battery packs are in a parallel structure. When the power of the first battery pack (which is the advantage power supply) is too low, switch to another battery pack (backup power supply), which can effectively increase the The driving range of an electric vehicle.

[0030] 2. The role of BMS battery management system: including SOC calculation or dynamic monitoring of the working st...

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Abstract

The invention relates to the field of electric vehicle equipment, in particular to a battery pack switching control device and method for an electric vehicle. In order to solve the problems existing in the prior art, the switching control device and method are provided. When a BMS detects that one of battery packs is not suitable for supplying power to the electric vehicle, a switching command is sent to a contactor control unit through a PCU, at the moment, the first battery pack and the second battery pack are controlled to be connected and disconnected through turn-on and turn-off of two main negative contactors, and the two battery packs alternately work independently. The device comprises the first battery pack, the second battery pack, the BMS, the PCU and the contactor control unit. When the contactor control unit receives the command of the PCU, the first battery pack or the second battery pack is connected, and the first battery pack or the second battery pack is connected with a power use device; and when the switching command of the PCU is received, the first battery pack and the second battery pack are controlled to be switched to each other.

Description

technical field [0001] The invention relates to the field of electric vehicle equipment, in particular to an electric vehicle battery pack switching control device and method. Background technique [0002] In pure electric vehicles, a large-capacity power battery pack system is required to achieve the goal of long battery life. In order to maintain the balance of the cells and avoid safety problems caused by damage to the single cells, a large number of battery cells in the automotive battery pack system cannot be used in parallel; therefore, such a large-capacity battery system can only be composed of a large number of battery cells in series. As a result, the overall voltage platform of the battery pack is too high, which is prone to safety hazards. In addition, because the battery voltage is too high, it is difficult to find a matching charging facility for a car equipped with this battery pack system, resulting in inconvenience. SUMMARY OF THE INVENTION [0003] The ...

Claims

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Application Information

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IPC IPC(8): B60L11/18H02J7/36
CPCB60L58/12B60L58/18H02J7/36Y02T10/70
Inventor 李佳楠张明向建明古自勇张琼
Owner WM MOTOR TECH GRP CO LTD
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