Power battery charging and discharging protection method and device
A power battery, charging and discharging technology, applied in battery/fuel cell control devices, control devices, electric vehicles, etc., can solve the problems of battery overcharging or overdischarging, power battery damage, and the inability to independently control the size of charging and discharging power, etc. , to prevent overcharge or overdischarge and improve life
Active Publication Date: 2019-02-15
WEICHAI POWER CO LTD
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Problems solved by technology
[0003] The charging and discharging process of the power battery is controlled by the vehicle control unit (VCU), which cannot independently control the charging and discharging power
At present, the commonly used solution is passive protection, that is, power limit or power reduction processing is performed after the actual power exceeds the limit; among them, the VCU performs a single limit based on the power limit value sent by the battery BMS, which is very prone to battery overcharge or overdischarge, resulting in The power battery is damaged, reducing the life of the power battery
Method used
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[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0045] See figure 1 , shows a flow chart of a power battery charge and discharge protection method according to an embodiment of the present application, and the method is applied to a vehicle control unit VCU, such as figure 1 As shown, the method may include the following steps:
[0046] S110. Obtain the change rate of the running speed c...
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The invention provides a power battery charging and discharging protection method and device. The power battery charging and discharging protection method is an active protection mode. The change rateof a running speed control signal in the running process is actively monitored; and then a corresponding charging and discharging power limit value is determined according to the change rate of the running speed control signal. The charging and discharging power limit value is converted into a torque limit value of a motor in a locomotive. And finally, the torque of the motor is controlled to belower than or equal to the torque limit value. It can be know according to the process that the method monitors the change rate of the running control signal, adjusts the torque limit value of the motor according to the change rate of the running control signal and controls the charging and discharging power limit value of a power battery by controlling the output torque of the motor; and therefore, an over-charge or over-discharge phenomenon of the power battery is prevented, and the service life of the power battery is prolonged.
Description
technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a charging and discharging protection method and device for a power battery. Background technique [0002] With the vigorous promotion of new energy vehicles in the country, more and more new energy vehicles appear on the market. The energy storage devices commonly used in new energy vehicles are mainly power batteries. [0003] The charging and discharging process of the power battery is controlled by the vehicle control unit (VCU), which cannot independently control the charging and discharging power. At present, the commonly used solution is passive protection, that is, power limit or power reduction processing is performed after the actual power exceeds the limit; among them, the VCU performs a single limit according to the power limit value sent by the battery BMS, which is very prone to battery overcharging or overdischarging, resulting in The power battery i...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B60L58/10B60L15/20
CPCB60L15/20B60L2240/12B60L2240/423B60L2250/26Y02T10/70Y02T10/72
Inventor 邓金涛李华张芳韩福强
Owner WEICHAI POWER CO LTD