A heatable bipolar battery

Abstract

The invention provides a heatable bipolar battery. The current collector heat exchange part or the heating part of the heatable bipolar battery is electrically connected with the positive terminal and the negative terminal of the bipolar battery via a conductive cable to form a series connection. , parallel or mixed heating circuits. Before the bipolar battery is running—that is, before charging and discharging, the control switch can be closed so that the current of the external power supply or the current of the battery itself flows through the current collector heat exchange part or the heating part to directly heat the bipolar battery stack; when When the temperature in the bipolar battery stack reaches a certain range, the control switch is turned off, so that the current of the external power supply does not flow through the current collector heat exchange part or the heating part but charges the bipolar battery stack, or the battery The own current no longer flows through the current collector heat exchange part or the heating part but supplies current to the external load. The heating structure of the heatable bipolar battery is simple, the operation is simple, and it can also function as a shielding circuit and an equalizing 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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