System and method for detecting loss of case of battery pack of electric vehicle

Abstract

The embodiments of the present invention disclose a system and method for detecting the loss of the case of the battery pack of an electric vehicle. The system includes a brittle conductive material layer, a first resistor, a second resistor, a travel switch and a controller; the brittle conductive material layer is disposed on the inner surface of the bottom of the case of the battery pack and comprises a first joint and a second joint which extend continuously in a first direction intersecting the running direction of the electric vehicle; the first resistor is connected in series with the brittle conductive material layer; the second resistor is connected in parallel with the first resistor; the first end of the travel switch is connected with the brittle conductive material layer, andthe second end of the travel switch is connected with the second resistor; when detecting that a distance from the travel switch to the battery pack is smaller than a predetermined threshold, the travel switch is switched from a normally open state to a closed state; the controller is used for sending pulse width modulation (PWM) signals to the first joint, emitting disconnection alarm signals when the controller cannot receive PWM signals from the second joint, and emitting damage alarm signals when confirming that the PWM signals received from the second joint and the PWM signals sent to thefirst joint are equal in duty cycle and are different in amplitude. With the system and method adopted, the complete damage and partial damage of the battery pack can be detected.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electric vehicles, in particular to a system and method for detecting the loss of a battery pack case of an electric vehicle. Background technique [0002] Energy shortages, oil crises and environmental pollution are intensifying, which have a huge impact on people's lives and are directly related to the sustainable development of the country's economy and society. All countries in the world are actively developing new energy technologies. As a new energy vehicle with reduced oil consumption, low pollution, and low noise, electric vehicles are considered to be an important way to solve the energy crisis and environmental degradation. [0003] The battery pack of an electric vehicle is usually arranged on the chassis of the vehicle, and the bottom of the lower case of the battery pack is vulnerable to the impact of ground materials. For example: flying stones, metal objects, pro...

AI Technical Summary

Problems solved by technology

For example: flying stones, metal objects, protrusions, etc. may easily cause deformation or direct damage to the battery pack shell, causing damage to the internal power battery, and may cause the power battery to catch fire or even explode in severe cases

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