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Control method and system of switch-off process of relay of power battery

A technology of power battery and control method, which is applied in electric traction, electric vehicles, electric devices, etc., can solve the problems of safe operation of vehicles that affect the service life of power battery systems, non-compliance with the operation status of hybrid electric vehicles and electric vehicles, etc.

Active Publication Date: 2015-08-19
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the operation process of hybrid electric vehicles and electric vehicles is an extremely complicated process. The battery management system controls the disconnection of the relay after receiving the relay disconnection command from the vehicle key switch and other control buttons, regardless of other influencing factors. Often do not conform to the actual operating state of hybrid electric vehicles and electric vehicles, which ultimately affects the service life of the power battery system and the safe operation of the vehicle

Method used

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  • Control method and system of switch-off process of relay of power battery
  • Control method and system of switch-off process of relay of power battery
  • Control method and system of switch-off process of relay of power battery

Examples

Experimental program
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Embodiment 1

[0103]This embodiment provides a control method for the disconnection process of the power battery relay, such as figure 2 shown, including the following steps:

[0104] S1: Receive relay disconnection command.

[0105] S2: According to the operating status of the vehicle and the power battery system, it is judged whether the disconnection condition of the positive relay is met, and if so, an instruction to disconnect the positive relay is issued, and the positive relay is disconnected.

[0106] S3: After disconnecting the positive relay, judge whether the disconnection condition of the negative relay is met according to the operating status of the vehicle and the power battery system, and if so, issue a command to disconnect the negative relay and disconnect the negative relay.

[0107] The control method for the disconnection process of the power battery relay described in this embodiment, in the specific implementation, it is necessary to disconnect the positive relay fir...

Embodiment 2

[0120] On the basis of Embodiment 1, the control method of the power battery relay disconnection process described in this embodiment, such as image 3 As shown, the operating status of the vehicle and the power battery system in the step S2 and the step S3 includes the fault level of the vehicle and the power battery system, the current condition in the power battery circuit, and the waiting time in each state; the step S2 Including the following steps:

[0121] S21: Determine whether the vehicle and the power battery system are faulty. If a fault occurs, define the state corresponding to the fault as the first state, and use whether the waiting time in the first state meets the requirements as the criterion for judging whether the positive relay disconnection condition is met standard, if it is met, it is judged that the disconnection condition of the positive relay is met, and an instruction to disconnect the positive relay is issued; if not, it proceeds to step S23.

[01...

Embodiment 3

[0142] On the basis of Embodiment 1 or Embodiment 2, the control method of the power battery relay disconnection process described in this embodiment, such as Figure 4 As shown, the step S3 includes the following steps:

[0143] S31: After disconnecting the positive relay, define the state after disconnecting the positive relay as the third state, judge whether there is a fault in the vehicle and the power battery system or cancel the diagnosis, if a fault occurs or cancel the diagnosis, wait in the third state Whether the time meets the requirements is used as a criterion for judging whether the disconnection condition of the negative relay is met. If yes, it is determined that the disconnection condition of the negative relay is met, and an instruction to disconnect the negative relay is issued; if not, proceed to step S35.

[0144] S32: If no fault occurs and the diagnosis is not cancelled, judge whether the waiting time in the third state meets the requirements, if not, r...

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Abstract

The invention provides a control method and system of the switch-off process of a relay of a power battery. The control method comprises the following steps: after receiving a command of switching off the relay, judging whether the conditions of switching off an anode relay are satisfied or not according to the running states of a vehicle and a power battery system, and if yes, sending out a command of switching off the anode relay so as to switch off the anode relay; and after switching off the anode relay, judging whether conditions of switching off a cathode relay are satisfied or not according to the running states of the vehicle and the power battery system, and if yes, sending out a command of switching off the cathode relay so as to switch off the anode relay. Therefore, according to the control method disclosed by the invention, the running states of the vehicle and the power battery system are comprehensively considered, and the corresponding relay can be switched off only when the switch-off conditions are satisfied, wherein the switch-off conditions include the failure level, the interval time of states, and the constraint conditions of electric current and conform to the actual running states of the vehicle and the power battery system. Thus, the service life of the power battery system is prolonged, and the safe running of the vehicle is guaranteed.

Description

technical field [0001] The invention relates to a control method and system. Specifically, it relates to a control method and system for the disconnection process of a power battery relay. Background technique [0002] The power battery system is the core component of hybrid electric vehicles and electric vehicles, and generally includes a power battery module, a battery management system, etc., wherein the battery management system controls the on-off of the power battery module. The voltage output terminal of the power battery module is connected to a load (such as an electric motor) to provide power for hybrid electric vehicles and electric vehicles. [0003] Such as figure 1 As shown, the power battery module includes a battery pack, a positive relay, a negative relay, a pre-charging resistor, and a pre-charging relay. Single batteries are connected in series to provide energy for hybrid electric vehicles and electric vehicles, and their total voltage can generally re...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L3/04B60L11/18
CPCY02T10/70
Inventor 杨伟斌
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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