Apparatus for detecting expansion of cells of battery pack and power battery pack

Abstract

The invention relates to an apparatus for detecting the expansion of cells of a battery pack and a power battery pack. The detection device comprises a fixed rack and a cell expansion detection unit.The fixed rack comprises a first installation plate and a second installation plate, which are oppositely arranged. The first installation plate is provided with two installation holes, wherein the distance between two installation holes is smaller or equal to the normal thickness of cells. The cell expansion detection unit comprises an annular metal belt, an elastic part, and a tensile force sensor. The annular metal belt goes through two installation holes. The part, which is arranged between the first installation plate and the second installation plate, of the annular metal belt forms a connection part, and the rest part forms a cell wrapping part. One end of the elastic part is connected to the connection part of the annular metal belt, the other end is connected to the tensile forcesensor, and the tensile force sensor is fixedly connected to the second installation plate. The provided apparatus can monitor the volume expansion of a single cell in a battery pack in real time, andthe expansion situation of the single cell in the battery pack can be represented more accurately and reliably.

Description

technical field [0001] The invention relates to the technical field of power vehicle batteries, in particular to a detection device for cell expansion of a battery pack and a power battery pack. Background technique [0002] With the rapid increase in the number of new energy vehicles in my country's auto industry, lithium-ion power batteries have become the key to the development of electric vehicles. The current power battery is often installed on a power vehicle in the form of a power battery pack, and the power battery pack generally includes an external casing and a battery pack arranged in the casing. [0003] During the life cycle of the power battery, the battery volume will expand to a certain extent with the cycle of charging and discharging. When the battery volume expands to a certain extent, the shell will rupture and the electrolyte will flow out, which may cause major safety issues such as combustion and explosion. . [0004] Aiming at the expansion of the p...

AI Technical Summary

Problems solved by technology

[0005] However, the existing detection methods for the cell pressure in the power battery pack are overall detection, that is, to detect the pressure of the cell pack, so what is detected is the average expansion degree of multiple cells in the entire cell pack value

When the volume of a single cell expands, the pressure data detected by the overall pressure sensor not only cannot reflect the problem, but will also cause false impressions and miss the opportunity to deal with it in time

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