Air-cooled battery box

Abstract

The invention relates to the technical field of lithium ion battery cases, in particular to an air-cooled battery box. The air-cooled battery box comprises a box body and a battery module arranged inside the box body; the box body comprises a main box body and a box cover, a heat conduction assembly is arranged in the main box body and comprises a heat conduction pipe, a heat conduction silicon rubber pad and heat insulation cotton, the heat conduction pipe is arranged inside the main box body, the heat insulation cotton is pasted at a position, corresponding to the heat conduction pipe, on the main box body, the heat conduction silicon rubber pad is bonded on a contact surface of the heat conduction pipe with the side wall of the main box body, and the battery module contacts the heat conduction pipe after being arranged; and a heat dissipation assembly comprises heat dissipation fins and a centrifugal fan, wherein the heat dissipation fins are arranged on the side wall of the main box body through bolts, and the centrifugal fan is arranged on the heat dissipation fins through bolts. The device is simple in process, low in cost and reliable in structure, and improves the reliability and safety of a battery system.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cases, in particular to an air-cooled battery case. Background technique [0002] At present, the charging and discharging process of electric vehicle power batteries will generate chemical reaction heat and resistance heat, especially with the development of large monomer capacity and high specific energy lithium-ion batteries, the exothermic effect of electric vehicle power batteries is significant, resulting in battery The temperature inside the cabinet increases significantly. The performance and life of electric vehicle power batteries are closely related to their working environment temperature. Studies have shown that after 800 cycles of lithium-ion batteries at 25°C and 45°C, the battery capacity drops by 31% and 36% respectively; while the battery operates at 50°C, 600 cycles The battery capacity drops by 60% after cycling; the battery capacity drops by 70% after 500 cycles a...

AI Technical Summary

Problems solved by technology

[0003] The cooling of electric vehicle power batteries mainly relies on natural cooling and forced air cooling to achieve heat dissipation. Natural cooling is often difficult to meet the heat dissipation requirements of lithium batteries operating in high-power or high-temperature environments, and fan forced convection cooling is needed to improve the heat dissipation effect. Air-cooled chassis air ducts are mostly designed in series, such as a battery box for vehicles disclosed in patent document CN103238251A. The battery box includes a box body and a battery cell. There are air outlets on the other side of the box wall; there are more than two rows of battery cells, and the battery cells in each row of battery cells are arranged at intervals in the longitudinal direction, and the battery cells in each row are arranged at intervals in the horizontal direction. The main air duct is formed between the battery cells in a row, and the branch air duct is formed between two adjacent battery cells in the same row of battery cells. The air inlet is connected to the upstream position of the main air duct, and the air outlet is connected to the main air duct. Downstream or at the downstream position of the branch air duct, when in use, the air flows from the air inlet into the main air duct through the air supply or exhaust mode of the fan, and after passing through the sides of each battery cell sequentially along the main air duct and the branch air duct, Flow out from the air outlet, although the rib-type air distribution structure formed by the main air duct and the branch air duct can reduce the temperature difference of each battery cell in the battery box, especially the battery cells in the middle and downstream positions of the main air duct The design of the branch air duct is used for sufficient cooling, but the cold air blown or sucked into the battery box by the fan directly contacts the surface of the battery cell, so that the dust, rain and other sundries mixed in the cold air will erode the surface of the battery cell , so that the life of the surface protective layer of the battery cell is shortened, so that the service life of the entire battery box is shortened, and the stability of use is reduced

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