A thermally balanced bipolar battery stack

Abstract

The invention provides a thermally balanced bipolar battery stack, in which a thermally balanced device is arranged. The thermal equalization device includes a first deflector with a first passage inside and a second deflector with a second passage inside. A plurality of first deflectors are respectively arranged between two adjacent groups of electrode sheets in the horizontal direction and arranged on the upper and lower sides of the bipolar battery stack, and a plurality of second deflectors are respectively arranged along the vertical direction. One or more groups of electrode pads are provided with insulating and sealing frames. The first deflector is fixedly connected to the second deflector so that the first channel of the interconnected first deflector and the second deflector are in fluid communication with the second channel, so that the first deflector of the plurality of first deflectors An integral fluid channel is formed in a channel and the second channels of the plurality of second baffles. By injecting cooling fluid or heating fluid into the channel, the cooling, heating and thermal balance of the bipolar battery stack can be realized, thereby improving the safety performance and low temperature performance of the battery stack.

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 a bipolar battery consists of two unipolar electrode sheets, several bipolar electrode sheets, a separator, and an electrolyte. A 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. There is a unipolar electrode sheet behind the material layer or the negative electrode material layer. Since the battery unit of a bipolar battery stack is composed of an electrode plate, a positive electrode material layer, a separator layer, a negative electrode material layer and another electrode plate, each battery unit is an independent electrochemical structure, which can be achieved by increasing the bipolar The number of electrode sheets is used to increase the number of battery c...

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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