Battery cell protection device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell protection device, which comprises a fastener, a battery cell protection cover and a battery cell protection cover, the first connecting seat is provided with a first fixing part and a first connecting part which are fixedly connected, and the first fixing part is connected with the fastener; the second connecting seat is provided with a second fixing part and a second connecting part which are fixedly connected, and the second fixing part is connected with the fastener; the protective cover plate is used for covering the battery cell, one side end of the protective cover plate is connected with the first connecting part, and the other side end of the protective cover plate is connected with the second connecting part. According to the battery cell protective device disclosed by the invention, the problems that the connection between the upper cover and the battery cell is unstable, and stable protection cannot be provided for the battery cell are solved or improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell cover device. Background Art

[0002] The battery module consists of multiple groups of battery cells, and the top cover is fixed on the battery cells. It not only protects and fixes the battery cells, but also undertakes multiple tasks such as sealing and leak prevention, current conduction, energy management, safety assurance, and improving the overall performance of the battery module.

[0003] In the related art, the upper cover is fixed to both sides of the battery cell by gluing. However, the viscosity of the glue decreases as the number of times it is removed increases, causing the upper cover to fall off the battery cell during transportation or handling, making it unable to protect the battery cell. Utility Model Content

[0004] In view of this, the present application provides a battery cell protection device to solve or improve the problem that the connection between the upper cover and the battery cell is unstable and cannot provide stable protection for the battery cell.

[0005] The present application provides a battery cell protection device, comprising:

[0006] Fasteners, used to fasten onto the battery core;

[0007] A first connecting seat is provided with a first fixing portion and a first connecting portion that are fixedly connected, and the first fixing portion is connected to the fastener;

[0008] A second connecting seat is provided with a second fixing portion and a second connecting portion that are fixedly connected, and the second fixing portion is connected to the fastener;

[0009] The protective cover is used to cover the battery core, with one side end of the protective cover connected to the first connecting portion and the other side end connected to the second connecting portion.

[0010] The fastener is fixed on the battery cell, the first fixing part and the second fixing part are connected to the fastener, one side end of the protective cover is connected to the first connecting part, and the other side end is connected to the second connecting part, so that the protective cover can be covered on the battery cell to protect the battery cell, and the protective cover is connected to the battery cell through the first fixing part, the second fixing part and the fastener, and the connection is more secure, avoiding the situation where the connection strength decreases with the increase of use time.

[0011] In an optional embodiment, the first connecting portion includes a plurality of first connecting rings, the first fixing portion is provided with a plurality of first connecting holes, the protective cover plate is provided with a plurality of first through holes corresponding to the plurality of first connecting holes, and the first connecting rings are passed through the first connecting holes and the first through holes that are arranged opposite to each other;

[0012] The second connecting portion includes a plurality of second connecting rings, the second fixing portion is provided with second connecting holes, the protective cover plate is provided with a plurality of second through holes corresponding to the plurality of second connecting holes, and the second connecting rings are passed through the relatively arranged second connecting holes and the second through holes.

[0013] One side end of the protective cover is connected to the first fixing portion through a plurality of first connecting rings, and the other side end is connected to the second fixing portion through a plurality of second connecting rings. The structure is simple and the connection is convenient.

[0014] The first fixing part and the second fixing part are fixed on the fastener, and one side end of the protective cover plate is provided with multiple first through holes corresponding to the multiple first connection holes, and the first connecting ring connects a corresponding first connection hole and a first through hole, so that the protective cover plate is connected to the first fixing part, and the other side end of the protective cover plate is provided with multiple second through holes corresponding to the multiple second connection holes, and the second connecting ring connects a corresponding second connection hole and a second through hole, so that the protective cover plate is connected to the second fixing part. The protective cover plate covers the battery cell and protects the battery cell, and the protective cover plate is connected to the fastener by multiple first connecting rings and multiple second connecting rings, so that the installation strength of the protective cover plate can be improved.

[0015] In an optional embodiment, the first connecting ring and the second connecting ring both include a first arc-shaped rod and a second arc-shaped rod, the first end of the first arc-shaped rod is rotatably connected to the first end of the second arc-shaped rod, the second end of the first arc-shaped rod is provided with a hook, and the second end of the second arc-shaped rod is provided with a hook groove, and the hook and the hook groove are detachably connected.

[0016] One end of the first arc rod and the second arc rod are rotatably connected, and the other end is detachably connected through a hook and a hook groove. The connection structure is simple and convenient for disassembly and assembly, and the connection stability is strong.

[0017] In an optional embodiment, the fastener includes a first fastening band, a second fastening band, a first length adjustment member and a second length adjustment member, the first length adjustment member is provided with a first connecting end and a first adjustment end, the second length adjustment member is provided with a second connecting end and a second adjustment end, the two ends of the first fastening band are respectively connected to the first connecting end of the first length adjustment member and the second connecting end of the second length adjustment member, the two ends of the second fastening band are respectively connected to the first adjustment end of the first length adjustment member and the second adjustment end of the second length adjustment member, the effective use length of the second fastening band is adjusted to be fixed on the battery cell, the first fixing part is fixedly connected to the first length adjustment member, and the second fixing part is fixedly connected to the second length adjustment member.

[0018] The first fastening band and the second fastening band are connected by the first length adjusting member and the second length adjusting member to form an annular fastening band with adjustable length. According to the actual number of battery cells in use, the effective use length of the second fastening band is adjusted so that the annular fastening band is clamped and fixed on the battery cell. The protective cover is connected to the first length adjusting member and the second length adjusting member through the first fixing part and the first fixing part, which is more secure.

[0019] In an optional embodiment, the first length adjustment member includes an outer shell, and openings at both ends of the outer shell form a first channel for the first end of the second fastening belt to pass through. A plurality of first adjustment holes connected to the first channel are correspondingly provided on two opposite side walls of the outer shell, and the plurality of first adjustment holes are arranged at intervals along the length direction of the first channel. A connecting hole is provided at the first end of the second fastening belt, and the second fastening belt is fixed to the outer shell by a pin shaft passing through the connecting hole and the first adjustment hole, and one end of the first fastening belt is fixedly connected to the outer shell.

[0020] The first end of the second fastening band is inserted into the first channel, and the length of the first fastening band inserted into the first channel is adjusted. The pin shaft passes through the first adjustment hole and the connecting hole on the two side walls of the shell, and the first end of the second fastening band is fixedly connected to the shell. The length of the annular fastening band can be adjusted to adapt to different groups of battery cells, so that the annular fastening band is clamped on the battery cell, providing an installation position for the installation of the protective cover.

[0021] In an optional embodiment, a slot is formed on the side wall of the housing, and the first fixing portion is engaged with the slot. The first fixing portion and the slot are connected by the engaging method, which is more convenient and easy to assemble and disassemble.

[0022] In an optional embodiment, the second length adjustment member includes a shell, and openings at both ends of the shell form a second channel for the second end of the second fastening belt to pass through. A plurality of second adjustment holes connected to the second channel are correspondingly provided on two opposite side walls of the shell, and the plurality of second adjustment holes are arranged at intervals along the length direction of the second channel. A fixing hole is provided at the second end of the second fastening belt, and the second fastening belt is fixed to the shell by pins passing through the fixing hole and the second adjustment hole. The end of the first fastening belt away from the outer shell is fixedly connected to the shell.

[0023] The second end of the second fastening band is inserted into the second channel, and the length of the second fastening band inserted into the second channel is adjusted. The pin passes through the second adjustment hole and the fixing hole on the two side walls of the shell, and the second end of the second fastening band is fixedly connected to the shell. The length of the annular fastening band can be adjusted to adapt to different groups of battery cells, so that the annular fastening band is clamped on the battery cell, providing an installation position for the installation of the protective cover.

[0024] The first end and the second end of the second fastening belt are inserted into the first channel and the second channel respectively. The annular fastening belt is adjusted to a suitable length and fixed by a pin shaft and a pin respectively.

[0025] In an optional embodiment, a fixing groove is formed on the side wall of the shell, and the second fixing portion is engaged with the fixing groove.

[0026] In an optional embodiment, a connecting notch is provided on the side walls of two adjacent first adjustment holes, and a sliding groove is provided on the pin shaft corresponding to the connecting notch. The pin shaft is suitable for rotating and switching between the engaging position and the adjustment position. In the engaging position, the pin shaft is engaged in the first adjustment hole. In the adjustment position, the sliding groove corresponds to the connecting notch, so that the pin shaft can slide into the adjacent first adjustment hole.

[0027] The pin is inserted into the first adjustment hole and the first through hole. The pin is rotated to be in the adjustment position. The slide groove corresponds to the connecting notch, so that the pin moves along the arrangement direction of the multiple first adjustment holes, driving the second fastening belt to penetrate the first channel. After adjusting to the appropriate position of the annular fastening belt, the pin is rotated to make the slide groove and the connecting notch staggered, so that the pin is clamped on a first adjustment hole. There is no need to pull out the pin, and the adjustment is more convenient.

[0028] In an optional embodiment, the protective cover plate is an inverted U-shaped plate, a first side plate of the inverted U-shaped plate is provided with a plurality of first through holes, a second side plate of the inverted U-shaped plate is provided with a plurality of second through holes, and the plurality of second through holes are connected to the second fixing portion.

[0029] The inverted U-shaped plate can be covered on the battery cell, the first side plate and the second side plate of the inverted U-shaped plate can be covered on both sides of the battery cell, and the top plate is covered on the top of the battery cell to protect the battery cell at multiple angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a schematic structural diagram of a battery cell protection device according to an embodiment of the present application;

[0032] Figure 2 This is an exploded view of a battery cell protection device according to an embodiment of the present application;

[0033] Figure 3 This is a schematic structural diagram of a fastener in a battery cell protection device according to an embodiment of the present application;

[0034] Figure 4 for Figure 3 A partial enlarged schematic diagram;

[0035] Figure 5 This is a structural schematic diagram of a first connecting socket in a battery cell protection device according to an embodiment of the present application;

[0036] Figure 6 for Figure 5 A partial enlarged schematic diagram of B in the middle;

[0037] Figure 7 for Figure 1 Right view;

[0038] Figure 8 for Figure 7 A partial enlarged schematic diagram of center C;

[0039] Figure 9 This is a schematic structural diagram of a pin shaft in a battery cell protection device according to an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 1. Fastener; 11. First fastening belt; 12. Second fastening belt; 13. First length adjustment member; 131. Housing; 132. First adjustment hole; 133. Pin; 14. Second length adjustment member; 141. Housing; 142. Second adjustment hole; 143. Pin; 2. First connecting seat; 21. First fixing portion; 22. First connecting ring; 221. First arc-shaped rod; 222. Second arc-shaped rod; 3. Second connecting seat; 31. Second fixing portion; 32. Second connecting ring; 4. Protective cover; 5. Slot; 6. Connecting gap. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0043] The following combination Figures 1 to 9 , describing the embodiments of the present application.

[0044] According to an embodiment of the present application, a battery cell protection device is provided, comprising:

[0045] Fastener 1, used for fastening to the battery cell;

[0046] The first connecting seat 2 is provided with a first fixing portion 21 and a first connecting portion that are fixedly connected, and the first fixing portion 21 is connected to the fastener 1;

[0047] The second connecting seat 3 is provided with a second fixing portion 31 and a second connecting portion that are fixedly connected, and the second fixing portion 31 is connected to the fastener 1;

[0048] The protective cover plate 4 is used to cover the battery cell. One side end of the protective cover plate 4 is connected to the first connecting portion, and the other side end is connected to the second connecting portion.

[0049] The fastener 1 is fixed on the battery cell, the first fixing part 21 and the second fixing part 31 are connected to the fastener 1, one side end of the protective cover 4 is connected to the first connecting part, and the other side end is connected to the second connecting part, so that the protective cover 4 can be covered on the battery cell to protect the battery cell, and the protective cover 4 is connected to the battery cell through the first fixing part 21, the second fixing part 31 and the fastener 1, and the connection is more firm, avoiding the situation where the connection strength decreases with the increase of use time.

[0050] In one embodiment, Figures 5 and 6 As shown, the first connecting part includes a plurality of first connecting rings 22, a plurality of first connecting holes are provided on the first fixing part 21, a plurality of first through holes are opened on the protective cover plate 4 corresponding to the plurality of first connecting holes, and the first connecting rings 22 are passed through the first connecting holes and the first through holes arranged oppositely; the second connecting part includes a plurality of second connecting rings 32, a plurality of second connecting holes are provided on the second fixing part 31, a plurality of second through holes are opened on the protective cover plate 4 corresponding to the plurality of second connecting holes, and the second connecting rings 32 are passed through the second connecting holes and the second through holes arranged oppositely.

[0051] One side end of the protective cover plate 4 is connected to the first fixing portion 21 through a plurality of first connecting rings 22 , and the other side end is connected to the second fixing portion 31 through a plurality of second connecting rings 32 , which has a simple structure and convenient connection.

[0052] The first fixing portion 21 and the second fixing portion 31 are fixed to the fastener 1, and a plurality of first through holes are opened on one side end of the protective cover plate 4 corresponding to the plurality of first connection holes, and the first connecting ring 22 connects a corresponding first connection hole and a first through hole, so that the protective cover plate 4 is connected to the first fixing portion 21, and a plurality of second through holes are opened on the other side end of the protective cover plate 4 corresponding to the plurality of second connection holes, and the second connecting ring 32 connects a corresponding second connection hole and a second through hole, so that the protective cover plate 4 is connected to the second fixing portion 31. The protective cover plate 4 covers the battery cells and protects the battery cells, and the protective cover plate 4 is connected to the fastener 1 by multiple first connecting rings 22 and multiple second connecting rings 32, so that the installation strength of the protective cover plate 4 can be improved.

[0053] In one embodiment, the first connecting ring 22 and the second connecting ring 32 each include a first curved rod 221 and a second curved rod 222. The first end of the first curved rod 221 is rotatably connected to the first end of the second curved rod 222. The second end of the first curved rod 221 is provided with a hook, and the second end of the second curved rod 222 is provided with a hook groove, and the hook and the hook groove are detachably connected. The first curved rod 221 and the second curved rod 222 are rotatably connected at one end, and the other ends are detachably connected by the hook and the hook groove. This connection structure is simple and convenient for assembly and disassembly, while also providing strong connection stability.

[0054] In a specific embodiment, a through hole is formed at the first end of the first arc rod 221 and the first end of the second arc rod 222 , and the first arc rod 221 and the second arc rod 222 are rotatably connected via a pin rod passing through the through hole.

[0055] In one embodiment, Figures 3 and 4 As shown, the fastener 1 includes a first fastening band 11, a second fastening band 12, a first length adjusting member 13 and a second length adjusting member 14. The first length adjusting member 13 is provided with a first connecting end and a first adjusting end, and the second length adjusting member 14 is provided with a second connecting end and a second adjusting end. The two ends of the first fastening band 11 are respectively connected to the first connecting end of the first length adjusting member 13 and the second connecting end of the second length adjusting member 14, and the two ends of the second fastening band 12 are respectively connected to the first adjusting end of the first length adjusting member 13 and the second adjusting end of the second length adjusting member 14. The effective use length of the second fastening band 12 is adjusted to be fixed on the battery cell. The first fixing portion 21 is fixedly connected to the first length adjusting member 13, and the second fixing portion 31 is fixedly connected to the second length adjusting member 14.

[0056] The first and second fastening straps 11, 12 are connected by first and second length adjusters 13, 14, forming an annular fastening strap with adjustable length. The effective length of the second fastening strap 12 is adjusted based on the number of battery cells actually in use, ensuring that the annular fastening strap is clamped securely to the battery cells. The protective cover 4 is connected to the first and second length adjusters 13, 14 via the first fixing portion 21 and the second fixing portion 21, providing a more secure connection. The effective length refers to the length between the points where the two ends of the second fastening strap 12 contact the outer shell 131 and the housing 141, respectively.

[0057] In one embodiment, the first length adjustment member 13 includes a shell 131, and the openings at both ends of the shell 131 form a first channel for the first end of the second fastening belt 12 to pass through. A plurality of first adjustment holes 132 connected to the first channel are correspondingly provided on the two opposite side walls of the shell 131. The plurality of first adjustment holes 132 are arranged at intervals along the length direction of the first channel. A connecting hole is provided at the first end of the second fastening belt 12. The second fastening belt 12 is fixed to the shell 131 by a pin shaft 133 passing through the connecting hole and the first adjustment hole 132. One end of the first fastening belt 11 is fixedly connected to the shell 131.

[0058] The first end of the second fastening belt 12 is inserted into the first channel, and the length of the first fastening belt 11 inserted into the first channel is adjusted. The pin 133 passes through the first adjustment hole 132 and the connecting hole on the two side walls of the shell 141, and the first end of the second fastening belt 12 is fixedly connected to the shell 131. The length of the annular fastening belt can be adjusted to adapt to different groups of battery cells, so that the annular fastening belt is clamped on the battery cell, providing an installation position for the installation of the protective cover 4.

[0059] In one embodiment, a slot 5 is formed on the top side wall of the housing 131, and the first fixing portion 21 is snap-fitted to the slot 5. The first fixing portion 21 is snap-fitted to the slot 5, which is more convenient and easy to assemble and disassemble.

[0060] In a specific embodiment, Figures 7 and 8 As shown, the slot 5 is a T-shaped slot with two ends passing through, and the first fixing portion is a T-shaped plate, which is clamped in the T-shaped slot.

[0061] In a specific embodiment, the T-shaped plate is provided with a horizontal plate and a vertical plate, the horizontal plate is clamped in the T-shaped slot, the vertical plate extends out of the notch of the T-shaped slot, and the part of the vertical plate extending out of the notch of the T-shaped slot is provided with multiple first connecting holes, and multiple first connecting rings 22 are connected to the multiple first connecting holes in a corresponding manner.

[0062] In one embodiment, the second length adjustment member 14 includes a shell 141, and the openings at both ends of the shell 141 form a second channel for the second end of the second fastening belt 12 to pass through. A plurality of second adjustment holes 142 connected to the second channel are correspondingly provided on the two opposite side walls of the shell 141. The plurality of second adjustment holes 142 are arranged at intervals along the length direction of the second channel. A fixing hole is provided at the second end of the second fastening belt 12. The second fastening belt 12 is fixed to the shell 141 by a pin 143 passed through the fixing hole and the second adjustment hole 142. The end of the first fastening belt 11 away from the outer shell 131 is fixedly connected to the shell 141.

[0063] The second end of the second fastening band 12 is inserted into the second channel, and the length of the second fastening band 12 inserted into the second channel is adjusted. The pin 143 passes through the second adjustment hole 142 and the fixing hole on the two side walls of the shell 141, and the second end of the second fastening band 12 is fixedly connected to the shell 141. The length of the annular fastening band can be adjusted to adapt to different groups of battery cells, so that the annular fastening band is clamped on the battery cells, providing an installation position for the installation of the protective cover 4.

[0064] The first end and the second end of the second fastening belt 12 are inserted into the first channel and the second channel respectively. The annular fastening belt is adjusted to a suitable length and fixed by the pin shaft 133 and the pin 143 respectively.

[0065] In one embodiment, a fixing groove is defined on the side wall of the housing 141 , and the second fixing portion 31 is engaged with the fixing groove.

[0066] In a specific embodiment, the structure of the fixing slot is the same as that of the clamping slot 5 , and the structure of the second fixing portion 31 is the same as that of the first fixing portion 21 .

[0067] In one embodiment, a connecting notch 6 is provided on the side walls of two adjacent first adjustment holes 132, and a sliding groove 7 is provided on the pin shaft 133 corresponding to the connecting notch 6. The pin shaft 133 is suitable for rotating and switching between the engaging position and the adjustment position. In the engaging position, the pin shaft 133 is engaged in the first adjustment hole 132. In the adjustment position, the sliding groove 7 corresponds to the connecting notch 6, so that the pin shaft 133 can slide into the adjacent first adjustment hole 132.

[0068] More specifically, if Figure 9 As shown, two sliding grooves 7 are provided on the side wall of the vertical pin shaft 133 along the axial direction thereof, and the two sliding grooves 7 are symmetrically arranged up and down.

[0069] The pin 133 is passed through the first adjustment hole 132 and the first through hole. The pin 133 is rotated to be in the adjustment position. The slide groove 7 corresponds to the connecting notch 6, so that the pin 133 moves along the arrangement direction of the multiple first adjustment holes 132, driving the second fastening belt 12 to penetrate the first channel. After adjusting to the appropriate position of the annular fastening belt, the pin 133 is rotated to make the slide groove 7 and the connecting notch 6 staggered, so that the pin 133 is clamped on a first adjustment hole 132. There is no need to pull out the pin 133, and the adjustment is more convenient.

[0070] In a specific embodiment, the pin 143 and the pin shaft 133 have the same structure, and the shell 141 and the outer shell 131 have the same structure.

[0071] In one embodiment, the protective cover plate 4 is an inverted U-shaped plate, a first side plate of the inverted U-shaped plate is provided with a plurality of first through holes, a second side plate of the inverted U-shaped plate is provided with a plurality of second through holes, and the plurality of second through holes are connected to the second fixing portion 31 .

[0072] The inverted U-shaped plate can be covered on the battery cell, the first side plate and the second side plate of the inverted U-shaped plate can be covered on both sides of the battery cell, and the top plate is covered on the top of the battery cell to protect the battery cell at multiple angles.

[0073] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the accompanying application.

Claims

1. A battery cell protection device, characterized in that: include: A fastener (1) for fastening onto the battery core; A first connecting seat (2) is provided with a first fixing portion (21) and a first connecting portion that are fixedly connected, wherein the first fixing portion (21) is connected to the fastener (1); A second connecting seat (3) is provided with a second fixing portion (31) and a second connecting portion that are fixedly connected, wherein the second fixing portion (31) is connected to the fastener (1); A protective cover plate (4) is used for covering the battery core, wherein one side end of the protective cover plate (4) is connected to the first connecting portion, and the other side end is connected to the second connecting portion.

2. The battery cell protection device according to claim 1, characterized in that: The first connecting portion comprises a plurality of first connecting rings (22), the first fixing portion (21) is provided with a plurality of first connecting holes, the protective cover plate (4) is provided with a plurality of first through holes corresponding to the plurality of first connecting holes, and the first connecting rings (22) are passed through the first connecting holes and the first through holes that are arranged opposite to each other; The second connecting portion comprises a plurality of second connecting rings (32), the second fixing portion (31) is provided with a plurality of second connecting holes, the protective cover plate (4) is provided with a plurality of second through holes corresponding to the plurality of second connecting holes, and the second connecting rings (32) are passed through the second connecting holes and the second through holes that are arranged opposite to each other.

3. The battery cell protection device according to claim 2, characterized in that: The first connecting ring (22) and the second connecting ring (32) both comprise a first arc-shaped rod (221) and a second arc-shaped rod (222), wherein the first end of the first arc-shaped rod (221) is rotatably connected to the first end of the second arc-shaped rod (222), the second end of the first arc-shaped rod (221) is provided with a hook, and the second end of the second arc-shaped rod (222) is provided with a hook groove, and the hook and the hook groove are detachably connected.

4. The battery cell protection device according to claim 3, characterized in that: The fastener (1) comprises a first fastening belt (11), a second fastening belt (12), a first length adjusting member (13) and a second length adjusting member (14); the first length adjusting member (13) is provided with a first connecting end and a first adjusting end; the second length adjusting member (14) is provided with a second connecting end and a second adjusting end; the two ends of the first fastening belt (11) are respectively connected to the first connecting end of the first length adjusting member (13) and the second connecting end of the second length adjusting member (14); the two ends of the second fastening belt (12) are respectively connected to the first adjusting end of the first length adjusting member (13) and the second adjusting end of the second length adjusting member (14); the effective use length of the second fastening belt (12) is adjusted to be fixed on the battery cell; the first fixing portion (21) is fixedly connected to the first length adjusting member (13); and the second fixing portion (31) is fixedly connected to the second length adjusting member (14).

5. The battery cell protection device according to claim 4, characterized in that: The first length adjustment member (13) includes a shell (131), and the openings at both ends of the shell (131) form a first channel for the first end of the second fastening belt (12) to pass through. A plurality of first adjustment holes (132) communicating with the first channel are correspondingly provided on two opposite side walls of the shell (131). The plurality of first adjustment holes (132) are arranged at intervals along the length direction of the first channel. A connecting hole is provided at the first end of the second fastening belt (12). The second fastening belt (12) is fixed to the shell (131) by a pin shaft (133) passing through the connecting hole and the first adjustment hole (132). One end of the first fastening belt (11) is fixedly connected to the shell (131).

6. The battery cell protection device according to claim 5, characterized in that: A clamping slot (5) is provided on the side wall of the housing (131), and the first fixing portion (21) is clamped with the clamping slot (5).

7. The battery cell protection device according to claim 5, characterized in that: The second length adjustment member (14) includes a shell (141), and the two ends of the shell (141) are opened to form a second channel for the second end of the second fastening belt (12) to pass through. A plurality of second adjustment holes (142) connected to the second channel are correspondingly opened on two opposite side walls of the shell (141). The plurality of second adjustment holes (142) are arranged at intervals along the length direction of the second channel. A fixing hole is opened at the second end of the second fastening belt (12). The second fastening belt (12) is fixed to the shell (141) by a pin (143) passed through the fixing hole and the second adjustment hole (142). The end of the first fastening belt (11) away from the shell (131) is fixedly connected to the shell (141).

8. The battery cell protection device according to claim 7, characterized in that: A fixing groove is provided on the side wall of the housing (141), and the second fixing portion (31) is engaged with the fixing groove.

9. The battery cell protection device according to claim 5, characterized in that: A connecting notch (6) is provided on the side walls of two adjacent first adjustment holes (132), and a sliding groove (7) is provided on the pin shaft (133) corresponding to the connecting notch (6). The pin shaft (133) is suitable for rotating and switching between a clamping position and an adjustment position. In the state of the clamping position, the pin shaft (133) is clamped in the first adjustment hole (132). In the state of the adjustment position, the sliding groove (7) corresponds to the connecting notch (6), so that the pin shaft (133) can slide into the adjacent first adjustment hole (132).

10. The battery cell protection device according to claim 8, characterized in that: The protective cover plate (4) is an inverted U-shaped plate, a first side plate of the inverted U-shaped plate is provided with a plurality of first through holes, a second side plate of the inverted U-shaped plate is provided with a plurality of second through holes, and the plurality of second through holes are connected to the second fixing portion (31).

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