Heatable bipolar battery

Abstract

The invention provides a heatable bipolar battery. A current collector heat exchange part or a heating part of the heatable bipolar battery is electrically connected with a positive terminal and a negative terminal of the bipolar battery through a conductive cable to form a series-connection, parallel-connection or series-parallel connection heating circuit. Before the bipolar battery operates, namely before charging and discharging, a control switch can be closed, so that the current of an external power supply or the current of the battery flows through the current collector heat exchange part or the heating part to directly heat a bipolar battery stack; and when the temperature in the bipolar cell stack reaches a certain range, the control switch is switched off, so that the current ofthe external power supply does not flow through the current collector heat exchange part or the heating part any more but charges the bipolar cell stack, or the current of the cell does not flow through the current collector heat exchange part or the heating part any more but supplies current to an external load. The heatable bipolar battery is simple in heating structure and simple and convenientto operate, and can play a role in shielding a circuit and equalizing the circuit.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a heatable 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 a positive electrode material layer and a negative electrode material layer on both sides of a bipolar current collector. A unipolar electrode sheet refers to an electrode sheet on the side of a unipolar current collector. Electrode sheet with unipolarity after coating positive electrode material layer or negative electrode material layer. Since the battery cells of a bipolar battery stack are composed of a current collector, a positive electrode material layer, a separator layer, a negative electrode material layer, and another current collector, each battery cell is an independent electrochemic...

AI Technical Summary

Problems solved by technology

[0003] However, ambient temperature has a greater impact on the performance of bipolar batteries

The average outdoor temperature in winter in northern my country is about -20°C. In high-altitude areas and in extreme weather, the outdoor temperature can even reach below -40°C. Under such ambient temperatures, the capacity of the battery stack will decay, especially in When the battery is quickly charged, it is easy to cause the battery to decompose lithium, which will lead to failures such as short circuit of the battery stack

In other words, the low temperature environment not only affects the performance of the battery such as rate and capacity, but also easily causes safety failures such as short circuits.

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