Lithium ion battery system for hybrid electric vehicle (HEV)

Abstract

The invention provides a lithium ion battery system for a hybrid electric vehicle (HEV), comprising a battery box body, battery module groups in the battery box body, a battery management system and a high-voltage device, wherein the battery management system is arranged in the battery box body and is close to one end of a forward engine room in the HEV; the battery box body is provided with an air inlet and an air outlet; the battery module groups are symmetrically arranged at the left and the right in two rows along an air-in/air-out direction; an air-in wedge-shaped channel is reserved between the two rows of the battery module groups; an air-out channel is reserved between the outside of the left and the right battery module groups and the battery box body; the air-out channel is communicated with the air outlet of the battery box body; and a diffuser grid plate is arranged in the air-in wedge-shaped channel so as to strengthen wind resistance to evenly disperse the air at the two sides of a battery pack. Air channels are arranged in a gap between the battery module groups, thus solving the problems of long air flow, unconspicuous cooling effect, and larger temperature difference between the air inlet and the air outlet, and ensuring that the single battery inside the battery pack is even in temperature, simple in structure, and easy to manufacture.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics applications, and in particular relates to the design of a cooling system for a battery pack used in a plug-in hybrid electric vehicle. Background technique [0002] The power battery is the core component of a hybrid electric vehicle, and its superior performance directly affects the performance of the vehicle. Lithium-ion batteries are emerging batteries in the 1990s. They have the advantages of small size, high specific energy and specific power, high voltage, long life, and environmental protection and pollution-free. However, lithium-ion batteries are sensitive to temperature, and they exhibit different charge-discharge curve characteristics (capacity, internal resistance, power, etc.) at different temperatures. The difference in temperature in the same battery pack is the main reason for the poor consistency of the battery, and After the batteries are grouped, the overall lif...

AI Technical Summary

Problems solved by technology

According to the cooling medium, it can be divided into: water cooling and air cooling; among them, water cooling uses water or ethanol as the cooling medium, which has the advantages of being insensitive to position and adapting to a wide temperature range, but has the disadvantages of complex structure, high cost, and complicated maintenance. There are few applications; although the air cooling method has disadvantages such as low efficiency and narrow temperature range, it will be greatly improved when combined with the vehicle air conditioning system. In addition, it has the advantages of simple design, low cost, and easy implementation. Currently applied mainstream

The air cooling system of the battery is divided into two types: series connection and parallel connection. Although the series connection has the characteristics of simplicity and low cost, it has the disadvantage of large temperature difference of the battery pack. The parallel heat dissipation system is limited by the layout space of the vehicle, and the cooling efficiency is low.

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