Battery module structure based on variable grid and control method thereof

Abstract

The invention discloses a battery module structure based on a variable grid and a control method thereof. The battery module structure comprises a battery box body, a battery cell, an upper layer of air inlet grid, a middle layer of air inlet grid, a lower layer of air inlet grid, a grid control wire harness, an air outlet, a temperature sensor, a temperature sensor signal wire harness, a vehiclespeed sensor, a vehicle speed sensor signal wire harness, a battery controller, an LIN communication module, a grid opening and closing controller, a grid opening and closing controller wire harness,a grid opening controller, a grid opening controller wire harness, a fan, a fan control wire harness and a brake execution module. The square battery cell is placed in the battery box body and is connected with the battery controlled through the temperature sensor signal wire harness; the battery controller performs comprehensive determination according to signals transmitted by the temperature sensor and the vehicle speed sensor and controls the opening and closing of the fan and the air inlet grid; and the brake execution module stops driving the motor according to the signal of the batterycontroller to finish emergency brake of the vehicle, so that efficient heat dissipation of the power battery is achieved, and the safety of the electric vehicle is guaranteed.

Description

technical field [0001] The invention relates to the technical field of a power battery thermal management system for an electric vehicle, in particular to a battery module structure and control method based on a variable grid. [0002] technical background [0003] In recent years, safety issues such as overheating, combustion, and explosion have been the focus of power battery research. The generation and rapid accumulation of heat will inevitably cause the internal temperature of the battery to rise, especially when it is used in a high temperature environment or when it is charged and discharged with a large current, it may cause A violent chemical reaction occurs inside the battery, generating a large amount of heat. If the heat accumulates quickly inside the battery without enough time to dissipate, the battery may leak, outgas, smoke, etc. In severe cases, the battery may burn violently or even explode. For traditional lead-acid batteries, or Ni-MH and Li-ion power batt...

AI Technical Summary

Problems solved by technology

[0004] In general, the air-cooled heat dissipation system with a common structure can meet the cooling and heat dissipation requirements, but under complex working conditions, especially in high discharge rate (such as plug-in hybrid applications), high charge rate (such as fast charge applications) ), high operating ambient temperature (hot weather in southern summer), it is obviously difficult to meet the heat dissipation requirements by relying on the air-cooled heat dissipation system with ordinary structure, and the temperature unevenness between batteries is also very prominent, so more efficient The air-cooled heat dissipation structure can meet the heat dissipation requirements of the battery pack

[0005] Patent Publication No. CN108039534A, published on May 15, 2018, the name of the invention is an air-cooled heat dissipation system for lithium batteries. The application discloses an air-cooled heat dissipation system for lithium batteries. The cold structure is too complicated, and it is impossible to carry out effective and targeted heat dissipation according to the real-time temperature change of a single cell, and the overall temperature uniformity of the module is low

[0006] Patent Publication No. CN106129525A, published on November 16, 2016, the name of the invention is power battery pack air cooling system, the application discloses a power battery pack air cooling system, its disadvantage lies in the designed air cooling system Only considering the heat dissipation at the bottom of the battery cell, the temperature difference between the top and bottom of the battery cell is too large, and the heat dissipation cannot be enhanced according to the temperature change of the battery pack, and the heat dissipation effect is poor

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