Thermal equilibrium type bipolar cell stack

Abstract

The invention provides a thermal equilibrium type bipolar cell stack. A thermal equilibrium device is arranged in the thermal equilibrium type bipolar cell stack. The thermal equilibrium device comprises first flow guide plates internally provided with first channels and second flow guide plates internally provided with second channels. The plurality of first flow guide plates are respectively arranged between two adjacent groups of electrode plates in the horizontal direction and are arranged on the upper side and the lower side of the bipolar battery stack, and the plurality of second flow guide plates are respectively arranged along the insulating sealing frames of one or more groups of electrode plates in the vertical direction. The first flow guide plates and the second flow guide plates are fixedly connected so that the first channels and the second channels of the first flow guide plates and the second flow guide plates which are mutually connected can be in fluid communication,so integral fluid channels are formed in the first channels of the first flow guide plates and the second channels of the second flow guide plates. By injecting cooling fluid or heating fluid into the channels, cooling, heating and thermal equilibrium of the bipolar cell stack can be realized, so that the safety performance, the low-temperature performance and the like of the cell stack are improved.

Description

Technical field [0001] The invention relates to the field of batteries, in particular to a bipolar battery. Background technique [0002] The battery stack of the bipolar battery consists of two unipolar electrode plates, several bipolar electrode plates, a separator and an electrolyte. Bipolar electrode sheet refers to an electrode sheet with two polarities after coating the positive electrode material layer and the negative electrode material layer on both sides of the bipolar plate, and the unipolar unipolar sheet refers to the positive electrode coated on one side of the unipolar plate The material layer or the negative electrode material layer is followed by a unipolar electrode sheet. Since the battery cells of the bipolar battery stack are composed of electrode plates, a positive electrode material layer, a separator layer, a negative electrode material layer and another electrode plate, each battery cell is an independent electrochemical structure, which can be increased...

AI Technical Summary

Problems solved by technology

However, the more electrode sheets are stacked, the less heat can be dissipated from the battery cells in the middle area of ​​the battery stack as soon as possible, so it is easy to cause thermal runaway of the battery stack and cause safety accidents; in addition, the battery cells in the middle area of ​​the battery stack and the side areas There is a temperature gradient between the battery cells, especially in the process of charging and discharging at a high rate, the temperature imbalance between the battery cells in the battery stack is more serious, which makes the problem of inconsistency between the battery cells more prominent, and the battery stack works for a long time In an environment with uneven temperature, the performance of the battery stack will be reduced and the life of the battery stack will be shortened

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