Method and system for determining pulse current in high-frequency pulse heating process of power battery

A power battery, high-frequency pulse technology, applied in battery/fuel cell control devices, electric vehicles, control drives, etc., can solve the problems of large layout space, low practicability, and low sampling frequency of current acquisition equipment, and achieve improved accuracy. Effect

Pending Publication Date: 2021-12-24
深蓝汽车科技有限公司
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  • Abstract
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Problems solved by technology

However, because the sampling frequency of the current acquisition equipment inside the battery is too low, the high-frequency pulse current collected during the high-frequency pulse heating process of the power battery is not accurate, which will affect the control accuracy of the pulse heating current and cannot achieve over-current protection.
If a high-precision current detection device is added inside the battery or on the motor bus, on the one hand, it will occupy a large layout space, on the other hand, it will increase the cost of detection, and the practicability is low

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  • Method and system for determining pulse current in high-frequency pulse heating process of power battery

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] like figure 1 As shown, the pulse current determination system during the high-frequency pulse heating process of the power battery includes a motor controller, and the motor controller includes a control module (not shown in the figure), a three-phase bridge arm and a bus capacitor C. The three-phase bridge arm is composed of a U-phase bridge arm, a V-phase bridge arm and a W-phase bridge arm connected in parallel, and the bus capacitor C is connected in parallel with the U-phase bridge arm, V-phase bridge arm and W-phase bridge arm. The U phase bridge arm is controlled by the upper bridge arm power switch K 1 and the power switch K of the lower bridge arm 4 connected, the V-phase bridge arm is composed of the upper bridge arm power switch K 2 and the low-side power switch K 5 The W phase bridge arm is composed of the upper bridge arm power switch K 3 an...

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Abstract

The invention discloses a method and a system for determining pulse current in a high-frequency pulse heating process of a power battery, and the method comprises the steps: calculating pulse current Ibattry through a formula in the process that the power battery discharges to store energy for U-phase, V-phase and W-phase stator windings of a three-phase motor; and in the process of charging the power battery by the U-phase stator winding, the V-phase stator winding and the W-phase stator winding of the three-phase motor, calculating the pulse current Ibattry by using another formula. According to the invention, the magnitude of the pulse current can be accurately determined in real time, the precision of pulse current control is improved, and overcurrent protection is facilitated.

Description

technical field [0001] The invention belongs to the field of electric vehicle motor control, and relates to a pulse current determination method and system in the high-frequency pulse heating process of a power battery. Background technique [0002] With the vigorous promotion of electric vehicles, the performance degradation of electric vehicles at low temperatures has gradually attracted people's attention. When the temperature is lower than zero degrees Celsius, the charging and discharging performance of the power battery will drop sharply, which will lead to problems such as insufficient power and shortened driving mileage in the low temperature environment of the electric vehicle, which seriously restricts the normal use of the electric vehicle in the low temperature environment . In order to effectively solve this problem, CN112977173A proposes a technology that uses high-frequency pulse heating of the motor to generate a high-frequency pulse current inside the power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20B60L58/27
CPCB60L15/20B60L58/27Y02T10/70Y02T10/72
Inventor 陈富彭钱磊陈健杜长虹邓承浩
Owner 深蓝汽车科技有限公司
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