Secondary battery device and secondary battery system

Abstract

According to an embodiment, a secondary battery device comprises an outer case (24) and a battery cell (23). The outer case has: a hermetic battery housing chamber (24a) formed thereinside; a refrigerant inlet (21) for supplying a liquid refrigerant (27) having insulation properties to the battery housing chamber; and a refrigerant outlet (22) for allowing the liquid refrigerant to flow out of the battery housing chamber. The battery cell has an electrode terminal, is provided inside the battery housing chamber of the outer case, and is immersed in the liquid refrigerant filled in the battery housing chamber.

Description

technical field [0001] Embodiments of the present invention relate to a secondary battery device and a secondary battery system. Background technique [0002] A battery cell (cell) accommodated in the secondary battery device generates heat due to charging and discharging. When the secondary battery device is operated at a high rate, since the heat generated from the battery cells increases, it is necessary to cool the battery cells according to the heat generated by the battery cells. As a general cooling method, it is conceivable to remove heat by air cooling, but air cooling has a problem of low cooling capacity. Furthermore, as another cooling method, a method of disposing a water cooling jacket inside or outside the secondary battery device and circulating cooling water through the water cooling jacket is conceivable. [0003] [Patent Document 1] Japanese Patent Laid-Open No. 2000-251953 [0004] [Patent Document 2] Japanese Patent Laid-Open No. 2000-348781 [0005]...

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned cooling method cannot sufficiently cool the battery cells away from the water cooling jacket, and the temperature distribution in the secondary battery device becomes large.

Therefore, a large temperature difference occurs in each battery cell, the charge-discharge performance of the secondary battery device decreases, and the charge-discharge life of the secondary battery device significantly decreases.

Moreover, when the water cooling jacket and the battery cell are closely arranged, the number of water cooling jackets increases, the size of the secondary battery device increases, and the volumetric energy density of the secondary battery device decreases, which increases the manufacturing cost.

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