A thermally balanced bipolar battery stack

Abstract

The invention provides a thermal equilibrium type bipolar cell stack. Each electrode plate in the thermal equilibrium type bipolar battery stack can be a first electrode plate or a second electrode plate; the insulating sealing frames of the first electrode plates completely wrap the peripheral edge of the electrode plates of the first electrode plates; the electrode plates of the second electrodeplates extend out of one or more side faces of the insulating sealing frames to form fin-shaped electrode plate heat exchange parts capable of conducting heat exchange with the surrounding environment; and the number of the first electrode plates is larger than or equal to 0, and the number of the second electrode plates is larger than or equal to 1. The electrode plate heat exchange parts are in contact with the insulation heat conduction material, the heat exchange medium, the phase change material, the heat exchange fluid and the like, so that the temperature consistency of the electrodeplate heat exchange part in the bipolar battery stack can be well controlled, the temperature consistency of each battery unit is effectively controlled, and the rate capability, the cycle life and the energy utilization rate of the battery 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 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 the 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 has an independent electrochemical structure, so it can be added by adding bipolar electrodes. The number of slices is used to increase the number of battery cells, ...

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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