Control method for keeping safe state during abnormal reset of BMS (Battery Management System)

A technology for abnormal reset and safe state, applied in battery/fuel cell control devices, climate sustainability, transportation and packaging, etc. It can solve problems such as abnormal CPU reset, high voltage drop, and violation of driver and passenger safety.

Pending Publication Date: 2021-09-14
力高(山东)新能源技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Battery Management System (BMS), as one of the core components of electric vehicles, has always been the focus of electric vehicle research and development; BMS, as a very important function of the power battery management system of new energy vehicles, is through the high-side switch or low-side switch Control the on-off of the high-voltage circuit relay to realize the charging and discharging of the power battery. Generally, an IO port of the CPU is used to drive the high-side switch or low-side switch circuit. When the IO of the CPU is set to 0, the high-side or low-side output disconnects the relay. Signal, if the IO of the CPU is 1, the high-side or low-side outputs a closed relay signal, and the initialization state of the high-side or low-side drive IO is disconnected, and the discharge state of the power battery is

Method used

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  • Control method for keeping safe state during abnormal reset of BMS (Battery Management System)
  • Control method for keeping safe state during abnormal reset of BMS (Battery Management System)
  • Control method for keeping safe state during abnormal reset of BMS (Battery Management System)

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Embodiment Construction

[0025] The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and cannot be interpreted as limiting the protection scope of the application. The above application content makes some non-essential improvements and adjustments to this application.

[0026] like Figure 1 to Figure 4 A control method for maintaining a safe state when a BMS is abnormally reset is shown,

[0027] A very important function of BMS as a new energy vehicle power battery management system is to control the on-off of the high-voltage circuit relay through the high-side switch or low-side switch to realize the charging and discharging of the power battery, such as figure 1 The control schematic diagram commonly used in the prior art shown generally drives a high-side switch or a low-side switch circuit through an IO port of the CPU. F...

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Abstract

The invention relates to a control method for keeping a safe state during abnormal reset of a BMS (Battery Management System). The method comprises the following steps: before a latch obtains a new control command of a CPU, keeping an IO signal output by the latch unchanged; and starting a BMS for self-checking, and controlling the CPU to send a new control command to the latch according to the self-checking result, so that the safety state of the vehicle is further ensured. The latch communicating through an SPI can keep the output IO signal when the CPU is reset abnormally, then the state of a high-voltage loop is kept, and then the BMS enters a proper safety state through a control method after the CPU is abnormally reset, so that the BMS system does not have the problem of high voltage drop caused by the abnormal reset of the CPU in the running process of the whole vehicle, and the functional safety of the whole vehicle is ensured.

Description

technical field [0001] The invention belongs to the field of battery management systems for new energy vehicles, in particular to the field of methods for maintaining a safe state when the BMS is abnormally reset. Background technique [0002] As one of the core components of electric vehicles, the Battery Management System (BMS) has always been the focus of electric vehicle research and development; BMS, as a very important function of the new energy vehicle power battery management system, is through the high-side switch or low-side switch. Control the relay on and off of the high-voltage circuit to realize the charging and discharging of the power battery. Generally, an IO port of the CPU is used to drive the high-side switch or low-side switch circuit. When the IO of the CPU is set to 0, the high-side or low-side output disconnects the relay. Signal, if the IO of the CPU is 1, the high-side or low-side outputs a closed relay signal, and the initialization state of the hi...

Claims

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Application Information

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IPC IPC(8): B60L58/10
CPCB60L58/10Y02T10/70Y02T90/16
Inventor 孙艳王翰超王云姜明军刘欢沈永柏江梓贤
Owner 力高(山东)新能源技术股份有限公司
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