A lithium iron phosphate battery assembly structure

Abstract

The application provides a lithium iron phosphate battery assembly structure and belongs to the technical field of battery assembly. The lithium iron phosphate battery assembly structure comprises a shell and a battery cell. The inside of the shell is provided with a lifting component that slides up and down. The battery cell can pass through the lifting component. The surface of the lifting component and the battery cell is attached and slides relative to each other. The inside of the shell is provided with a driving component that can push the lifting component upward. When the battery cell bulges, the battery cell presses the contact surface of the lifting component, increases the friction between the lifting component and the battery cell, and the bulging battery cell can be moved upward when the lifting component moves upward. The normal battery cell that does not bulge is connected to the lifting component through sliding. When the lifting component moves upward, the normal battery cell will not be moved upward. The height difference of the battery cell can directly and clearly distinguish the bulging battery cell, so that the staff can more conveniently replace the battery cell.

Description

Technical Field

[0001] This invention belongs to the field of battery assembly technology, and specifically relates to a lithium iron phosphate battery assembly structure. Background Technology

[0002] With societal development, the demand for energy is increasing, making energy and the environment major issues for human development and survival. Lithium iron phosphate (LFP) batteries are one such energy source. They are lithium-ion batteries that use lithium iron phosphate as the positive electrode material and carbon as the negative electrode material. LFP batteries offer advantages such as high operating voltage, high energy density, long cycle life, good safety performance, low self-discharge rate, and no memory effect.

[0003] The existing lithium-ion battery market has become increasingly mature, and the scale of various manufacturers has been expanding day by day. The advantages of lithium batteries have gradually become apparent, but there are also some difficult problems to solve, such as the heat generation problem of lithium battery packs. A lithium battery pack consists of multiple cells arranged in a certain rule to form a battery pack, with rectangular arrangements being the most common.

[0004] When battery cells are damaged after prolonged use, they may bulge. When replacing bulging battery cells, the team usually needs to remove each cell one by one to check if it is bulging before replacing it. This greatly increases the time spent checking the battery cells and thus affects work efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium iron phosphate battery assembly structure, which aims to solve the problem that in the prior art, when replacing bulging battery cells, it is usually necessary to remove each cell one by one to determine whether the cell is bulging before replacing it. This greatly increases the working time of inspecting the cells, thus affecting work efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lithium iron phosphate battery assembly structure, comprising: a housing and a battery cell, wherein a lifting component that slides vertically is disposed inside the housing, the battery cell can pass through the lifting component, the surfaces of the lifting component and the battery cell are in contact and slide relative to each other, a driving component that can push the lifting component upward is disposed inside the housing, a pressing component that can drive the lifting component downward is disposed above the lifting component, the pressing component is connected to the lifting component through a connecting post, the pressing component is located at the opening of the housing, and a limiting component that limits the height of the lifting component is disposed inside the housing.

[0007] In order to enable the lithium iron phosphate battery assembly structure to limit the lifting component, as a preferred embodiment of the present invention, the limiting component includes a first sliding groove formed in the inner wall of the housing, the two ends of the first sliding groove are connected, the first sliding groove has a top end and two bottom ends, and a protrusion is provided between the two bottom ends. The lifting component is provided with a sliding component that slides inside the first sliding groove, and the first sliding groove is provided with a guide structure that allows the sliding component to slide in only one direction.

[0008] In order to enable the lithium iron phosphate battery assembly structure to limit the lifting component, in a preferred embodiment of the present invention, the sliding component includes a second slide groove disposed on the lifting component, a slider is slidably connected inside the second slide groove, a sliding column is disposed on the slider and slides inside the first slide groove, and first elastic members are disposed on both sides of the slider to push the slider to the center inside the second slide groove.

[0009] To enable the lithium iron phosphate battery assembly structure to have a guiding structure, a guide plate is provided at the two bottom ends of the first slide groove. Both guide plates can only rotate in the same direction. The sliding column can push the guide plate to rotate. A reset structure is provided on one side of the first slide groove to reset the guide plate. The top end and the protrusion of the first slide groove both have inclined surfaces that guide the sliding direction of the sliding column. As a preferred embodiment of the present invention, the guiding structure includes guide plates at the two bottom ends of the first slide groove. Both guide plates can only rotate in the same direction. The sliding column can push the guide plate to rotate. A reset structure is provided on one side of the first slide groove to reset the guide plate. The top end and the protrusion of the first slide groove both have inclined surfaces that guide the sliding direction of the sliding column.

[0010] In order to enable the lithium iron phosphate battery assembly structure to reset the guide plate, as a preferred embodiment of the present invention, the reset structure includes a first magnet disposed on one side of the first groove, and the guide plate is a second magnet that repels the first magnet. The first magnet is installed on the rotating side of the guide plate.

[0011] To facilitate the placement of battery cells in this lithium iron phosphate battery assembly structure, in a preferred embodiment of the present invention, a fixing frame is provided at the opening of the housing, and a pressing component is provided above the fixing frame. Both the fixing frame and the pressing component are provided with through holes for the battery cells to pass through. The through holes of the pressing component are larger than the through holes of the fixing frame. The lifting component is provided with a covering component that wraps the outer wall of the top of the battery cell. The covering component passes through the through holes and is connected to the pressing component.

[0012] In order to enable the lithium iron phosphate battery assembly structure to prevent the battery cells from being bumped or knocked, as a preferred embodiment of the present invention, the material of the covering component is rubber, and the surface is provided with heat dissipation holes for heat dissipation of the battery cells. The covering component can separate the battery cells from the fixing frame.

[0013] In a preferred embodiment of the present invention, a top cover is provided on the housing by a latch, a cell connecting piece is provided inside the top cover, a contact hole is provided on the top cover so that the cell connecting piece can be connected to the cell, a gap is provided between the cell connecting piece and the bottom wall of the contact hole, the cell connecting piece is made of an elastic conductive material, and a chamfer is provided at the opening of the contact hole.

[0014] In order to facilitate the installation of the slider and the slide column inside the housing, in a preferred embodiment of the present invention, the slide column is slidably connected inside the slider, and the slider is provided with a third elastic element that pushes the slide column outward.

[0015] In a preferred embodiment of the present invention, the driving component is a second elastic element disposed at the bottom of the housing and pushing the lifting component upward, and a shock-absorbing pad is disposed at the bottom of the housing, and both the battery cell and the second elastic element are disposed on the shock-absorbing pad.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In this lithium iron phosphate battery assembly structure, the operator first presses the pressing component, which, in conjunction with the limiting component, causes the driving component to push the lifting component upward. The battery cell slides inside the lifting component, and the surfaces of the lifting component and the battery cell are in contact. When the battery cell bulges, the battery cell applies pressure to the contact surface with the lifting component, thereby increasing the friction between the lifting component and the battery cell. As the lifting component moves upward, it can move the bulging battery cell upward. Normal battery cells, which are not bulging, are connected to the lifting component by sliding. When the lifting component moves upward, it will not move the normal battery cells upward. Therefore, the height difference of the battery cells can be used to clearly distinguish the bulging battery cells, making it easier for the operator to replace the battery cells.

[0018] 2. In this lithium iron phosphate battery assembly structure, when the pressing component moves upward, it can pull the covering component upward. Since the perforation of the pressing component is larger than the perforation of the fixing frame, the end of the covering component located above the fixing frame can be formed into a funnel shape. This makes it easier for the battery cell to be inserted into the fixing frame and the lifting component during installation, thus improving the speed of battery cell installation.

[0019] 3. The lithium iron phosphate battery assembly structure uses a cover component placed between the battery cell and the fixing frame. The cover component is made of rubber, which protects the battery cell from being damaged by the fixing frame. At the same time, the cover component has heat dissipation holes, so as not to affect the heat dissipation of the battery cell. In addition, the bottom of the casing is also equipped with a shock-absorbing pad. With the use of the cover component, the effect of protecting the battery cell from impact damage can be further improved. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a specific embodiment of the present invention;

[0023] Figure 3 An isometric sectional view illustrating the structure of a specific embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the limiting component in a specific embodiment of the present invention;

[0025] Figure 5 for Figure 4 Enlarged structural diagram at point A

[0026] Figure 6 This is an isometric sectional view of a specific embodiment of the present invention;

[0027] Figure 7 for Figure 6 Enlarged structural diagram at point B;

[0028] Figure 8 This is a schematic diagram of the installation structure of the cell connecting piece in a specific embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the installation structure of the slider and the sliding column in a specific embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of a specific embodiment of the present invention.

[0031] In the diagram: 1. Housing; 2. Lifting component; 3. Battery cell; 4. Drive component; 41. Second elastic element; 5. Pressing component; 6. Limiting component; 61. First slide groove; 62. Top end; 63. Bottom end; 64. Protrusion; 65. Sliding component; 651. Second slide groove; 652. Sliding block; 653. Sliding column; 654. First elastic element; 66. Guide structure; 661. Guide plate; 662. Reset structure; 663. Inclined surface; 6621. First magnet; 653. Sliding column; 7. Fixing frame; 71. Perforation; 8. Covering component; 81. Heat dissipation hole; 9. Third elastic element; 10. Top cover; 11. Battery cell connecting piece; 12. Contact hole; 13. Gap; 14. Chamfer; 15. Shock-absorbing pad. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-3 This invention provides the following technical solution: a lithium iron phosphate battery assembly structure, comprising: a housing 1 and a battery cell 3, the battery cell 3 being installed inside the housing 1, a vertically sliding lifting component 2 being provided inside the housing 1, the battery cell 3 being able to pass through the lifting component 2, the surfaces of the lifting component 2 and the battery cell 3 being in contact and sliding relative to each other, normally the battery cell 3 is inside the lifting component 2, and when the lifting component 2 is moving up and down, the battery cell 3 moves downward relative to the lifting component 2, the housing 1 being provided with a driving component 4 that can push the lifting component 2 upward, the driving component 4 only having the function of pushing the lifting component 2 upward. Above the 2 is a pressing component 5 that can drive the lifting component 2 to move downward. The pressing component 5 is connected to the lifting component 2 through a connecting column. The operator can drive the lifting component 2 to move by pressing the pressing component 5 downward. The pressing component 5 is located at the opening of the housing 1. Inside the housing 1 is a limiting component 6 that limits the height of the lifting component 2. The limiting component 6 can make the lifting component 5 have two endpoint values, namely the top end and the bottom end. When the lifting component 5 is at the top end, the lifting component 5 is in the raised state. When the lifting component 5 is at the bottom end, the lifting component 5 is in the lowering state.

[0034] In a specific embodiment of the present invention, the operator first presses the pressing component 5, which, in conjunction with the limiting component 6, causes the driving component 4 to push the lifting component 2 upward. The battery cell 3 slides inside the lifting component 2, and the surfaces of the lifting component 2 and the battery cell 3 are in contact. When the battery cell 3 bulges, the battery cell 3 applies pressure to the contact surface with the lifting component 4, thereby increasing the friction between the lifting component 4 and the battery cell 3. As a result, when the lifting component 4 moves upward, it can drive the bulging battery cell 3 upward. The normal battery cell 3, which is not bulging, is connected to the lifting component 2 through a sliding connection. When the lifting component 2 moves upward, it will not drive the normal battery cell 3 upward. Therefore, the height difference of the battery cell 3 can be used to clearly distinguish the bulging battery cell 3, making it easier for the operator to replace the battery cell.

[0035] For details, please refer to Figure 1 and Figure 4 The limiting component 6 includes a first slide groove 61 formed on the inner wall of the housing 1. Limiting components 6 are provided on both sides of the inner wall of the housing 1 to make the limiting of the lifting component 2 more stable. The two ends of the first slide groove 61 are connected and communicate with each other, so that the first slide groove 61 can form a loop. The first slide groove 61 has a top end 62 and two bottom ends 63. A protrusion 64 is provided between the two bottom ends 63. When the lifting component 2 is provided with a sliding component 65 that slides inside the first slide groove 61, when the sliding component 65 is located at the top end 62, the lifting component 2 is in the rising state. When the lifting component 2 is located at the protrusion 64, the lifting component 2 is in the falling state. The first slide groove 61 is provided with a guide structure 66 that allows the sliding component 65 to slide in only one direction. The guide structure 66 allows the sliding component 65 to slide in only one direction.

[0036] For details, please refer to Figure 1 The sliding component 65 includes a second slide groove 651 disposed on the lifting component 2. The second slide groove 651 is horizontally opened on the sliding component 65. A slider 652 is slidably connected inside the second slide groove 651. A sliding column 653 is disposed on the slider 652 and slides inside the first slide groove 61. First elastic members 654, which are compression springs, are disposed on both sides of the slider 652 to push the slider 652 to the center inside the second slide groove 651. The first elastic member 654 is a compression spring. Through the interaction of the two compression springs, the slider 652 can be located inside the second slide groove 651, so that when the sliding column 653 slides inside the first slide groove 61, the first elastic member 654 can reset the slider 652.

[0037] For details, please refer to Figure 5The guide structure 66 includes guide plates 661 located at the two bottom ends 63 of the first slide groove 61. Both guide plates 661 can only rotate in the same direction. By setting the guide plates 661 to rotate in one direction, after the homeowner 653 passes through the guide plates 661, the guide plates 661 can limit the sliding direction of the sliding column 653, so that the homeowner 653 can slide in one direction. The sliding of the sliding column 653 can push the guide plates 661 to rotate. A reset structure 662 is provided on one side of the first slide groove 61 to reset the guide plates 661. When the sliding column 653 passes through the guide plates 661, the reset structure 662 can reset the guide plates 661. The top end 62 and the protrusion 64 of the first slide groove 61 both have inclined surfaces 663 to guide the sliding direction of the sliding column 653. By setting the inclined surfaces 663, when the homeowner 653 is in the center, the inclined surfaces 663 can assist in pushing the sliding column 653 to slide in one direction.

[0038] For details, please refer to Figure 5 The reset structure 662 includes a first magnet 6621 disposed on one side of the first slide groove 61. The first magnet 6621 is installed inside the first slide groove 61 and does not interfere with the sliding of the slide column 653. The guide plate 661 is a second magnet that repels the first magnet 6621. The first magnet 6621 is installed on the rotating side of the guide plate 661. By means of the principle that like poles repel and unlike poles attract, the first magnet 6621 can push the guide plate 661 to reset.

[0039] Furthermore, please refer to 2-3. A fixing frame 7 is provided at the opening of the housing 1. The fixing frame 7 can be integrally formed with the housing 1 by adhesive bonding. The pressing component 5 is located above the fixing frame 7. Both the fixing frame 7 and the pressing component 5 are provided with through holes 71 for the battery cell 3 to pass through. The through hole 71 of the pressing component 5 is larger than the through hole 71 of the fixing frame 7. The lifting component 2 is provided with a covering component 8 that wraps the outer wall of the top of the battery cell 3. The covering component 8 passes through the through hole 71 and is connected to the pressing component 5. When the pressing component 5 moves upward, it can pull the covering component 8 to move upward. Since the through hole 71 of the pressing component 5 is larger than the through hole 71 of the fixing frame 7, the end of the covering component 8 located above the fixing frame 7 can be formed into a trumpet shape. Therefore, when installing the battery cell 3, it is easier for the battery cell 3 to be inserted into the interior of the fixing frame 7 and the lifting component 2, thereby improving the installation speed of the battery cell 3.

[0040] Preferably, as described in 2-3, the material of the covering component 8 is rubber, and the surface is provided with heat dissipation holes 81 for heat dissipation of the battery cell 3. The covering component 8 can separate the battery cell 3 and the fixing frame 7. The covering component 8 is disposed between the battery cell 3 and the fixing frame 7, and the material of the covering component 8 is rubber, so as to protect the battery cell 3 and prevent the battery cell 3 from being bumped and damaged by the fixing frame 7. At the same time, the heat dissipation holes 81 are provided on the covering component 8, so as not to affect the heat dissipation of the battery cell 3.

[0041] Furthermore, please refer to 7-8. A top cover 10 is provided on the housing 1 via a latch. The top cover 10 can be used to close the housing 1, and the latch can make the top cover 10 easy to open, thereby facilitating the access of the battery cell 3. For replacement, the top cover 10 has multiple battery cell connecting pieces 11 inside, each connected to two adjacent battery cells 3 at the positive and negative terminals. The battery connecting pieces 11 are located inside the top cover 10, and the battery connecting plate 11 is installed during the production process of the top cover 10. The top cover 10 is made of plastic, which also serves as insulation. The top cover 10 has contact holes 12 that allow the battery cell connecting pieces 11 to connect with the battery cells 3. The positive and negative terminals of the battery cells 3 can connect to the battery cell connecting pieces 11 through the contact holes 12. A gap 13 is provided between the battery cell connecting pieces 11 and the bottom wall of the contact holes 12. The battery cell connecting pieces 11 are made of elastic conductive material. By providing the gap 13, the battery cells 3 can push the two ends of the battery cell connecting pieces 11 to bend slightly upwards. Because the battery cell connecting pieces 11 are made of elastic material, they can bend slightly upwards. The contact hole 12 has a chamfer 14 at the opening to allow for better contact with the battery cell 3. The chamfer 14 makes it easier for the positive and negative terminals of the battery cell 3 to be inserted into the contact hole 12.

[0042] Further, please refer to 9. The slide column 653 is slidably connected inside the slider 652. The slider 652 is provided with a third elastic element 9 that pushes the slide column 653 outward. The third elastic element 9 is a compression spring. When the lifting component 2 is installed, the slide column 653 is pressed into the inside of the slider 652, so that the lifting component 2 can be more easily installed into the inside of the child housing 1.

[0043] Furthermore, the driving component 4 is located at the bottom of the housing 1 and pushes the second elastic element 41 of the lifting component 2 upward. The second elastic element 41 is a compression spring. The lifting component 2 can be moved upward by the force of the compression spring. The bottom of the housing 1 is provided with a shock-absorbing pad 15. The material of the shock-absorbing pad 15 can be elastic materials such as rubber. The battery cell 3 and the second elastic element 41 are both located on the shock-absorbing pad 15. With the use of the covering component 8, the effect of protecting the battery cell 3 from bumps and knocks can be further improved.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium iron phosphate battery assembly structure, characterized in that, include: The housing (1) and the battery cell (3) are provided with a lifting component (2) that slides up and down inside the housing (1). The battery cell (3) can pass through the lifting component (2). The surfaces of the lifting component (2) and the battery cell (3) are in contact and slide relative to each other. The housing (1) is provided with a driving component (4) that can push the lifting component (2) upward. Above the lifting component (2) is a pressing component (5) that can drive the lifting component (2) downward. The pressing component (5) is connected to the lifting component (2) through a connecting column. The pressing component (5) is located at the opening of the housing (1). The housing (1) is provided with a limiting component (6) that limits the height of the lifting component (2). The limiting component (6) includes a first slide groove (61) formed on the inner wall of the housing (1). The two ends of the first slide groove (61) are connected. The first slide groove (61) has a top end (62) and two bottom ends (63). A protrusion (64) is provided between the two bottom ends (63). The lifting component (2) is provided with a sliding component (65) that slides inside the first slide groove (61). The first slide groove (61) is provided with a guide structure (66) that makes the sliding component (65) slide in only one direction. When the lifting component 2 is provided with a sliding component 65 that slides inside the first slide groove 61, when the sliding component 65 is at the top 62, the lifting component 2 is in the rising state, and when the lifting component 2 is at the protrusion 64, the lifting component 2 is in the falling state. When the battery cell (3) bulges, the friction between it and the lifting component (2) increases, causing the lifting component (2) to move upward and drive the bulging battery cell (3) to move upward, while the non-bulging battery cell (3) remains in its original position, thereby identifying the bulging battery cell by the height difference between the battery cells (3).

2. The lithium iron phosphate battery assembly structure according to claim 1, characterized in that: The sliding component (65) includes a second slide groove (651) disposed on the lifting component (2), a slider (652) is slidably connected inside the second slide groove (651), a slide post (653) is disposed on the slider (652) to slide inside the first slide groove (61), and a first elastic element (654) is disposed on both sides of the slider (652) to push the slider (652) to be centered inside the second slide groove (651).

3. The lithium iron phosphate battery assembly structure according to claim 2, characterized in that: The guide structure (66) includes guide plates (661) located at the two bottom ends (63) of the first slide groove (61). Both guide plates (661) can only rotate in the same direction. The sliding column (653) can push the guide plates (661) to rotate. A reset structure (662) for resetting the guide plates (661) is provided on one side of the first slide groove (61). The top end (62) and the protrusion (64) of the first slide groove (61) both have inclined surfaces (663) that guide the sliding direction of the sliding column (653).

4. The lithium iron phosphate battery assembly structure according to claim 3, characterized in that: The reset structure (662) includes a first magnet (6621) disposed on one side of the first slide (61), and the guide plate (661) is a second magnet that repels the first magnet (6621). The first magnet (6621) is mounted on the side of the guide plate (661) that rotates.

5. The lithium iron phosphate battery assembly structure according to claim 1, characterized in that: A fixing frame (7) is provided at the opening of the housing (1). The pressing component (5) is located above the fixing frame (7). Both the fixing frame (7) and the pressing component (5) are provided with through holes (71) through which the battery cell (3) passes. The through hole (71) of the pressing component (5) is larger than the through hole (71) of the fixing frame (7). The lifting component (2) is provided with a covering component (8) that wraps the outer wall of the top of the battery cell (3). The covering component (8) passes through the through hole (71) and is connected to the pressing component (5).

6. The lithium iron phosphate battery assembly structure according to claim 5, characterized in that: The material of the covering component (8) is rubber, and the surface is provided with heat dissipation holes (81) for heat dissipation of the battery cell (3). The covering component (8) can separate the battery cell (3) and the fixing frame (7).

7. The lithium iron phosphate battery assembly structure according to claim 1, characterized in that: The housing (1) is provided with a top cover (10) by a latch. The top cover (10) is provided with a cell connecting piece (11). The top cover (10) is provided with a contact hole (12) that allows the cell connecting piece (11) to connect with the cell (3). There is a gap (13) between the bottom wall of the cell connecting piece (11) and the contact hole (12). The cell connecting piece (11) is made of an elastic conductive material. The opening of the contact hole (12) is provided with a chamfer (14).

8. A lithium iron phosphate battery assembly structure according to claim 2, characterized in that: The slide bar (653) is slidably connected inside the slider (652), and the slider (652) is provided with a third elastic element (9) that pushes the slide bar (653) outward.

9. A lithium iron phosphate battery assembly structure according to any one of claims 1-8, characterized in that: The driving component (4) is a second elastic element (41) of the lifting component (2) located at the bottom of the housing (1) and pushing it upward. The bottom of the housing (1) is provided with a shock-absorbing pad (15), and the battery cell (3) and the second elastic element (41) are both located on the shock-absorbing pad (15).

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