Battery module and assembling method thereof

Abstract

The invention discloses a battery module and an assembling method thereof. In one embodiment of the invention, the battery module can comprise two or more batteries, a heat-conducting silica gel sheetand an optical fiber monitoring part, wherein the heat-conducting silica gel sheet is arranged between the two batteries, and two side surfaces of the heat-conducting silica gel sheet are respectively in contact with the surfaces of the two batteries; the temperature monitoring part comprises an optical fiber sensor, an optical fiber and an optical fiber grating demodulator; the optical fiber sensor and the optical fiber are both fixed in the heat-conducting silica gel sheet, one end of the optical fiber is connected with the optical fiber sensor, and the other end of the optical fiber extends out of the top end of the heat-conducting silica gel sheet and is connected with the optical fiber grating demodulator. According to the invention, the size of a battery pack is not additionally increased, and the real temperature of the batteries in the battery module can be accurately monitored while the heat dissipation effect is ensured, so that the risks of misjudgment and untimely responseare remarkably reduced, and the thermal runaway is effectively prevented.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a battery module and an assembly method thereof. Background technique [0002] At present, lithium-ion batteries are widely used in various energy storage fields due to their high energy density, long service life, and environmental protection. The ever-increasing battery energy density puts forward higher requirements for battery safety. However, lithium battery packs will generate a lot of heat when they work, and the heat generated by each battery is often different. It is necessary to diffuse the heat generated by the battery in time, otherwise the battery life will be reduced rapidly and even cause explosion or combustion. Moreover, the temperature of the battery needs to be kept consistent, otherwise the consistency error of the battery will gradually increase after running for a period of time, which will lead to a reduction in the life of the battery pack, that...

AI Technical Summary

Problems solved by technology

When monitoring the temperature of the battery pack, temperature measuring elements such as thermistors are often used. Due to the limitation of the space of the battery pack, the gaps between the batteries are limited, and the heat-conducting silicone sheet has been filled, so it is difficult to arrange it on the battery surface. Temperature measuring element, therefore, the temperature measuring probe is often bonded to the battery lug connection piece or placed in a fixed position that requires temperature measurement to detect the temperature of the battery pack, which leads to inaccurate temperature measurement of the battery pack

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