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

A cell expansion and detection device technology, applied in secondary battery testing, batteries, secondary batteries, etc., can solve problems such as false illusions, failure to reflect problems, and missed opportunities for timely processing, to avoid the reduction of energy density, Compact structure, avoid the effect of explosion

Active Publication Date: 2018-05-22
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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Effect test

Embodiment 1

[0038] The invention provides a detection device for cell expansion of a battery pack and a power battery pack containing the detection device. The detection device for cell expansion of a battery pack can monitor the volume expansion of a single cell in a battery pack in real time , so that more timely countermeasures can be taken to avoid problems such as explosion and combustion caused by excessive pressure between the cells.

[0039] see figure 1 A structural schematic diagram of a detection device for cell expansion of a battery pack (hereinafter referred to as the detection device) is shown, the detection device includes a fixing frame 1 and a cell expansion detection unit 2 . The cell expansion detection unit 2 is arranged on the fixing frame 1 and is used for detecting the volume expansion of a single cell in the battery pack. Here, the volume expansion of a single cell is the volume increase at least including the increase of the circumference of the cell.

[0040] ...

Embodiment 2

[0068] This embodiment provides a power battery pack, which is equipped with a battery pack and any of the above-mentioned detection devices. Since the detection device has the function of fixing the battery cells and has a compact structure, it can not only monitor the individual battery packs in real time. The expansion of the battery cell can also reduce the casing of the power battery pack and increase the energy density of the battery pack.

[0069] In a preferred embodiment, the power battery pack can also be provided with pressure sensors 4 on both sides of the battery pack as required, and the pressure sensors 4 are used to detect the lateral pressure of the entire battery pack to avoid excessive lateral pressure of the battery pack. cause cell damage.

[0070] The aforementioned power battery pack equipped with a pressure sensor can monitor the expansion of a single battery cell in the battery pack and the overall pressure of the battery pack at the same time, so it can...

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/4207H01M10/4285H01M10/482H01M2220/20Y02E60/10
Inventor 鲍添增朱修锋陈昌平刘俊军刘金辉
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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