Method and device for suppressing excessive discharge current of power battery and pure electric vehicle
A discharge current and power battery technology, applied in battery/fuel cell control devices, electric vehicles, control devices, etc., can solve the problem of shortening battery life, negative driving experience, and the inability of the battery management system to directly and quantitatively control the power battery discharge current and other issues to achieve the effect of improving safety
Active Publication Date: 2021-01-26
CH AUTO TECH CORP CO LTD
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Problems solved by technology
Therefore, the battery management system cannot directly and quantitatively control the discharge current of the power battery
Once the vehicle controller (Vehicle Control Unit, referred to as VCU) of a pure electric vehicle requests too much power from the power battery through the power distribution unit (Power Distribution Unit, referred to as PDU), it will cause the real-time discharge current of the power battery to exceed the current working condition. The allowable value of the power battery under the condition; and the excessive discharge current will directly shorten the service life of the battery
[0004] At present, there is a phenomenon that the life of the power battery is shortened because the discharge current of the power battery exceeds the allowable value for a long time
On the other hand, the alarm system of pure electric vehicles frequently reports power battery failures, which will also bring negative driving experience
Method used
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[0058] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0059] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The present invention provides a method for suppressing excessive discharge current of a power battery, including: determining the allowable discharge current value I 2 Corresponding current overshoot I 0 and delay time value t 0 ; When judging the actual discharge current value I of the power battery 1 with allowable discharge current value I 2 The current difference between I 3 greater than the current overshoot I 0 The duration is greater than the delay time value t 0 When , determine the torque value T to be suppressed 1 ;The current motor output torque value T 2 and the to-be-suppressed torque value T 1 The torque difference between T 3 , driver requested torque T 4 The smaller value of the two is the requested torque T of the vehicle 0 sent to the MCU, so that the MCU according to the requested torque T 0 Control the output torque of the motor to reduce the discharge current value of the power battery. The method actively adjusts the output torque of the motor by adjusting the requested torque sent to the MCU, thereby improving the safety and life of the power battery in use.
Description
technical field [0001] The invention relates to the technical field of pure electric vehicles, and more specifically, relates to a method and device for suppressing excessive discharge current of a power battery and a pure electric vehicle. Background technique [0002] Pure electric vehicles refer to vehicles powered by on-board batteries and driven by motors to drive wheels, which meet the requirements of road traffic and safety regulations. Compared with traditional cars, pure electric vehicles have less impact on the environment, and their prospects are widely optimistic. [0003] Because the discharge process of the battery is a chemical reaction, its discharge current depends on the power consumption of the load. Therefore, the battery management system cannot directly and quantitatively control the discharge current of the power battery. Once the vehicle controller (Vehicle Control Unit, referred to as VCU) of a pure electric vehicle requests too much power from the...
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IPC IPC(8): B60L58/14B60L15/20
CPCB60L15/20B60L2240/423Y02T10/70Y02T10/72
Inventor 王克坚王世蒙
Owner CH AUTO TECH CORP CO LTD