Soft package lithium battery expansion detection safety device

Abstract

The utility model relates to the technical field of battery expansion protection, in particular to a soft package lithium battery expansion detection safety device which comprises a lithium battery pack, the lithium battery pack comprises a soft package lithium ion battery, a BMS protection plate is attached to a tab of the soft package lithium ion battery, and a chip and an mos tube are arranged on the BMS protection plate. A flexible circuit board is further arranged on the soft package lithium ion battery in a surrounding mode, two flexible connecting blocks connected to the chip and the mos tube respectively extend from the side, facing the BMS protection board, of the flexible circuit board, the flexible circuit board is arranged on the soft package lithium ion battery in a surrounding mode, and the flexible connecting blocks connected to the chip and the mos tube on the BMS protection board extend from the flexible circuit board. When the soft package lithium ion battery expands, the flexible connecting block can be expanded and pulled, and then the connection between the flexible connecting block and the chip and the mos tube is disconnected, so that the use state of the soft package lithium ion battery is monitored, and the major safety problems of battery combustion and explosion are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery expansion protection, and in particular to a safety device for detecting expansion of a soft-pack lithium battery. Background Art

[0002] Consumer electronics are increasingly using batteries with higher capacities, placing increasing demands on battery safety. Soft-pack batteries, after a certain period of use, typically expand in their thickness. Continued use of batteries that expand beyond a safety threshold can not only render them inoperable but can also lead to serious safety concerns such as combustion or explosion. However, existing methods for detecting soft-pack battery expansion are complex and expensive, lacking a simple and effective method for monitoring whether a soft-pack battery's expansion exceeds the threshold. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a soft-pack lithium battery expansion detection safety device, including a lithium battery pack, wherein the lithium battery pack includes a soft-pack lithium-ion battery, a BMS protection board is attached to the pole ear of the soft-pack lithium-ion battery, a chip and a MOS tube are arranged on the BMS protection board, and a flexible circuit board is also arranged around the soft-pack lithium-ion battery. The flexible circuit board extends toward one side of the BMS protection board and has two flexible connection blocks respectively connected to the chip and the MOS tube, so as to monitor the usage status of the soft-pack lithium-ion battery and avoid major safety problems such as battery combustion and explosion.

[0004] Preferably, it also includes a bottom shell and a surface shell covering the bottom shell, and the bottom shell and the surface shell form a receiving cavity for placing the lithium battery pack to protect the battery cell from external impact.

[0005] Preferably, a preset gap is formed between the accommodating cavity and the soft-pack lithium-ion battery, thereby effectively improving the safety performance of battery use.

[0006] Preferably, a plurality of first bosses are formed on the side of the face shell facing the soft-pack lithium-ion battery, and the first bosses abut against the intersection of the flexible connecting block and the chip and the MOS tube to limit and fix the flexible connecting block to cooperate with the monitoring of the use status of the soft-pack lithium-ion battery.

[0007] Preferably, the bottom shell is located between the opposite surfaces of the soft-pack lithium-ion battery and the BMS protection plate to form a plurality of second bosses, and the second bosses abut against the BMS protection plate to achieve position-limiting fixation of the BMS protection plate.

[0008] From the above, it can be seen that the following beneficial effects can be obtained by applying the present application: the present application is through a lithium battery pack, the lithium battery pack includes a soft-pack lithium-ion battery, a BMS protection board is fitted at the pole ear of the soft-pack lithium-ion battery, a chip and a MOS tube are arranged on the BMS protection board, and a flexible circuit board is also arranged around the soft-pack lithium-ion battery, and the flexible circuit board extends toward one side of the BMS protection board and has two flexible connecting blocks respectively connected to the chip and the MOS tube. By arranging the flexible circuit board around the soft-pack lithium-ion battery, and extending the flexible connecting block connected to the chip and the MOS tube on the BMS protection board on the flexible circuit board, when the soft-pack lithium-ion battery expands, the flexible connecting block can be pulled by the expansion, and then disconnected from the chip and the MOS tube, thereby realizing monitoring of the use status of the soft-pack lithium-ion battery and avoiding major safety problems such as battery combustion and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments of the present application or the prior art. Obviously, the drawings described below are only part of the embodiments of the present application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0010] Figure 1 This is a schematic diagram of the structure of the safety device according to an embodiment of the present application;

[0011] Figure 2 For the embodiment of this application Figure 1 A magnified view of part A;

[0012] Figure 3 This is a front view of the safety device according to an embodiment of the present application.

[0013] Reference numerals

[0014] 10. Bottom shell; 20. Surface shell; 30. Lithium battery pack; 31. Soft-pack lithium-ion battery; 32. BMS protection board;

[0015] 33. Flexible circuit board; 101. Second boss; 201. First boss; 331. Flexible connecting block. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0017] Example

[0018] In order to solve the above technical problems, this embodiment provides a soft-pack lithium battery expansion detection safety device, such as Figure 1 As shown, it includes a lithium battery pack 30, which includes a soft-pack lithium-ion battery 31. A BMS protection board 32 is fitted at the pole ear of the soft-pack lithium-ion battery 31, and a chip and a MOS tube are arranged on the BMS protection board 32. A flexible circuit board 33 is also arranged around the soft-pack lithium-ion battery 31, and the flexible circuit board 33 extends toward one side of the BMS protection board 32. Two flexible connecting blocks 331 connected to the chip and the MOS tube are respectively connected. By surrounding the soft-pack lithium-ion battery 31 with the flexible circuit board 33 and extending the flexible connecting block 331 connected to the chip and the MOS tube on the BMS protection board 32, when the soft-pack lithium-ion battery 31 expands, the flexible connecting block 331 can be pulled by the expansion, and then disconnected from the chip and the MOS tube, thereby monitoring the use status of the soft-pack lithium-ion battery 31 and avoiding major safety problems such as battery combustion and explosion.

[0019] Specifically, it also includes a bottom shell 10 and a surface shell 20 covering the bottom shell 10. The bottom shell 10 and the surface shell 20 form a receiving cavity for placing the lithium battery pack 30. By providing the bottom shell 10 and the surface shell 20 covering the bottom shell 10, a receiving cavity for placing the lithium battery pack 30 can be formed between the bottom shell 10 and the surface shell 20, so that water and air infiltration can be effectively prevented from affecting the battery performance, thereby protecting the battery cell from external impact.

[0020] In the above scheme, a preset gap is formed between the accommodating cavity and the soft-pack lithium-ion battery 31. By forming a preset gap between the accommodating cavity and the soft-pack lithium-ion battery 31, sufficient space can be reserved for the soft-pack lithium-ion battery 31 to expand, and then the flexible connecting block 331 is disconnected from the chip and the MOS tube, thereby effectively preventing the abnormal increase of the internal pressure of the battery and effectively improving the safety performance of the battery.

[0021] Further, such as Figure 2As shown, a plurality of first bosses 201 are formed on the side of the face shell 20 facing the soft-pack lithium-ion battery 31. The first bosses 201 abut against the intersection of the flexible connection block 331 and the chip and the MOS tube. By forming the first boss 201 on the side of the face shell 20 facing the soft-pack lithium-ion battery 31, the flexible connection block 331 can be limited and fixed to the intersection of the chip and the MOS tube through the first boss 201, thereby realizing the limited fixation of the flexible connection block 331 to cooperate with the monitoring of the use status of the soft-pack lithium-ion battery 31.

[0022] In order to stably set the BMS protection board 32, as shown Figure 3 As shown, as an effective embodiment, the bottom shell 10 is located between the opposite surfaces of the soft-pack lithium-ion battery 31 and the BMS protection plate 32 and has several second bosses 101 formed thereon. The second bosses 101 abut against the BMS protection plate 32. By forming the second bosses 101 on one side of the bottom shell 10, the BMS protection plate 32 can be limited and fixed by the second bosses 101, and then firmly arranged on the ear side of the soft-pack lithium-ion battery 31, thereby realizing the limited fixation of the BMS protection plate 32.

[0023] To sum up, in one or more embodiments of the present application, the present application provides a lithium battery pack, wherein the lithium battery pack includes a soft-pack lithium-ion battery, a BMS protection board is fitted at the pole ear of the soft-pack lithium-ion battery, a chip and a MOS tube are arranged on the BMS protection board, and a flexible circuit board is also arranged around the soft-pack lithium-ion battery, and the flexible circuit board extends toward one side of the BMS protection board and has two flexible connecting blocks connected to the chip and the MOS tube respectively. By providing a flexible circuit board around the soft-pack lithium-ion battery, and extending a flexible connecting block connected to the chip and the MOS tube on the BMS protection board on the flexible circuit board, when the soft-pack lithium-ion battery expands, the flexible connecting block can be pulled by the expansion, and then disconnected from the chip and the MOS tube, thereby realizing monitoring of the use status of the soft-pack lithium-ion battery and avoiding major safety problems such as battery combustion and explosion.

[0024] The above-described embodiments do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the above-described embodiments shall be included in the scope of protection of this technical solution.

Claims

1. A soft-pack lithium battery expansion detection safety device, characterized by: The invention comprises a lithium battery pack (30), wherein the lithium battery pack (30) comprises a soft-pack lithium-ion battery (31), a BMS protection board (32) is attached to the tab of the soft-pack lithium-ion battery (31), a chip and a MOSFET are arranged on the BMS protection board (32), and a flexible circuit board (33) is also arranged around the soft-pack lithium-ion battery (31), and the flexible circuit board (33) extends toward one side of the BMS protection board (32) and has two flexible connection blocks (331) respectively connected to the chip and the MOSFET.

2. The soft-pack lithium battery expansion detection safety device according to claim 1, characterized in that: It also includes a bottom shell (10) and a front shell (20) covering the bottom shell (10), wherein the bottom shell (10) and the front shell (20) form a receiving cavity for accommodating a lithium battery pack (30).

3. The soft-pack lithium battery expansion detection safety device according to claim 2, characterized in that: A preset gap is formed between the accommodating cavity and the soft-pack lithium-ion battery (31).

4. The soft-pack lithium battery expansion detection safety device according to claim 2, characterized in that: A plurality of first bosses (201) are also formed on the side of the surface shell (20) facing the soft-pack lithium-ion battery (31), and the first bosses (201) abut against the intersection of the flexible connecting block (331) and the chip and the MOS tube.

5. The soft-pack lithium battery expansion detection safety device according to claim 4, characterized in that: The bottom shell (10) is located between the opposite surfaces of the soft-pack lithium-ion battery (31) and the BMS protection plate (32), and a plurality of second bosses (101) are formed thereon. The second bosses (101) abut against the BMS protection plate (32).

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