Forced air cooling battery box, and box body and cooling plates thereof

Abstract

The invention discloses a forced air cooling battery box, and a box body and cooling plates thereof. The cooling plates are arranged in air ducts of the box body; each cooling plate comprises two thermal conductive boards which are adhered to opposite side surfaces of two adjacent battery cells, and a thermal conductive core portion disposed between the two thermal conductive boards; the thermal conductive core portion is provided with cold air channels penetrating through two opposite end surfaces; the thermal conductive boards are side sealing surfaces used for preventing cold air in the cold air channels from being leaked out of the boards, so that the cold air in the cold air channels can achieve a predetermined effect of forced air cooling on the battery cells; the cold air in the cold air channels can be prevented from being leaked out of the cold boards under a blocking effect of the thermal conductive boards; the cold air can not scour the side surfaces of the battery cells; and impurities in the cold air do not erode the sides surface of the battery cells. Therefore, the cooling plates provided by the invention can increase a cooling effect of the cold air on the battery cells and uniformity of the temperature of the battery cells and reduce scouring of the surfaces of the battery cells by the cold air sucked in the battery box, so as to reduce erosion of the battery cells by the impurities in the cold air.

Description

technical field [0001] The invention relates to a forced air-cooled battery box, its box body and a cold plate. Background technique [0002] At present, the charging and discharging process of lithium-ion 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 lithium-ion power batteries is significant, resulting in battery The temperature inside the cabinet increases significantly. The performance and life of lithium-ion power batteries are closely related to the temperature of their working environment. 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 at 55°C. The increase in temperature no...

AI Technical Summary

Problems solved by technology

[0003] The cooling of lithium-ion 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. It is necessary to rely on forced convection cooling by fans to improve heat dissipation. However, existing forced 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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