A battery pack structure

Abstract

This application provides a battery pack structure for the field of battery technology. Specifically, it is a battery pack structure comprising: an upper support and a lower support forming a receiving cavity; the upper support having a tab guide groove; a battery cell assembly disposed within the receiving cavity, the tabs of the cells passing through the tab guide groove and exposed on the outer surface of the upper support; a BMS main control board, disposed parallel to the upper support and maintaining a gap therebetween; an electrical connection piece disposed between the upper support and the BMS main control board, the tabs being electrically connected to the BMS main control board via the electrical connection piece; a groove is also provided on the upper surface of the upper support, a positioning post is provided within the groove, and a positioning hole is provided on the electrical connection piece, the positioning post passing through the positioning hole and positioning the electrical connection piece within the groove. The above battery pack structure, by providing a groove and positioning post on the upper surface of the upper support, and providing corresponding positioning holes on the electrical connection piece, with the positioning post passing through the positioning hole, allows the electrical connection piece to be embedded in the groove and positioned.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack structure. Background Technology

[0002] Currently, the trend of cordless cleaning appliances (vacuum cleaners, steam cleaners, floor scrubbers, etc.) and power tools is becoming increasingly apparent. Cordless technology brings a lot of convenience, allowing people to use tools more flexibly in their lives and work.

[0003] There are two main types of batteries used in cleaning appliances and power tools: cylindrical cells and pouch cells. Each has its own advantages and disadvantages. Cylindrical cells have low cost and high production volume, but their performance is slightly inferior. Pouch cells have better performance, but their cost is high and their mechanical reliability is poor. Overcoming the shortcomings of pouch cells has become an urgent matter. Summary of the Invention

[0004] In view of this, this application provides a battery pack structure, which provides a groove and a positioning post on the upper surface of the upper bracket, and a corresponding positioning hole on the electrical connector piece, with the positioning post passing through the positioning hole to make the electrical connector piece embedded in the groove and positioned.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A battery pack structure, comprising:

[0007] The upper support and the lower support are provided. The upper support can cover the opening of the lower support and form a receiving cavity. The upper support is provided with multiple electrode guide grooves.

[0008] A battery cell assembly, comprising multiple battery cells, is disposed within the receiving cavity, wherein each tab of the battery cell assembly can pass through a tab guide groove and protrude from the outer surface of the upper support;

[0009] The BMS main control board is arranged parallel to the outside of the upper bracket and maintains a gap with the upper bracket.

[0010] An electrical connector is disposed between the upper bracket and the BMS main control board, and the electrode tab is electrically connected to the BMS main control board through the electrical connector;

[0011] The upper surface of the upper bracket is also provided with a groove, and a positioning post is provided in the groove. The electrical connector is provided with a positioning hole, and the positioning post can pass through the positioning hole and position the electrical connector in the groove.

[0012] Optionally, the positioning hole is provided with an upwardly protruding cylindrical body in the circumferential direction. The diameter of the cylindrical body gradually decreases from bottom to top. The positioning post can pass through the top of the cylindrical body. The upper end hole diameter of the cylindrical body is less than or equal to the diameter of the positioning post, and the lower end hole diameter of the cylindrical body is greater than the diameter of the positioning post.

[0013] Optionally, the ratio of the upper end aperture to the lower end aperture of the cylinder is R1, and the value of R1 satisfies 0.7≤R1≤0.9.

[0014] Optionally, the lower end diameter of the positioning hole is φ1, and the value of φ1 satisfies: 0.8mm≤φ1≤2.5mm.

[0015] Optionally, the cylinder is evenly divided into 3-6 abutment pieces along its circumference, and when the positioning post is inserted into the cylinder, the top of the abutment piece can abut against the positioning post.

[0016] Optionally, the cylinder is evenly divided into 4 abutment pieces along its circumference, and the ratio of the distance between the roots of adjacent abutment pieces to the distance between the tops of adjacent abutment pieces is R2, and the value of R2 satisfies 0.7≤R2≤0.8.

[0017] Optionally, the angle between the abutting piece and the horizontal plane is A1, and the value of A1 satisfies: 100°≤A1≤150°.

[0018] Optionally, the electrical connection piece includes a signal connection piece, the signal connection piece includes a signal connection body, one end of the signal connection body in the length direction is bent upward to form a signal connection terminal that is electrically connected to the BMS main control board, the other end of the signal connection body in the length direction is bent downward to form a U-shaped snap-fit ​​part, the groove is also provided with a snap-fit ​​receiving part, and the snap-fit ​​part can snap into the snap-fit ​​receiving part.

[0019] Optionally, the latching portion includes two parallel latching tabs and a connecting portion connecting the two latching tabs, with the top end of one latching tab connected to the signal connection body; the distance between the two latching tabs is D1, and the width of the latching receiving portion is D2, where D1 is 5%-10% larger than D2.

[0020] Optionally, when the snap-fit ​​portion is snapped into the snap-fit ​​receiving portion, the top of the snap-fit ​​portion is lower than the plane where the top of the groove is located.

[0021] Optionally, the inner surface of the upper support is further provided with a tab guide block. The tab guide block is provided with two tab guide surfaces. There is an included angle between the two tab guide surfaces of two adjacent tab guide blocks. The distance between the two tab guide surfaces of two adjacent tab guide blocks gradually decreases from bottom to top. The gap between two adjacent tab guide blocks on the upper support forms the tab guide groove.

[0022] Optionally, the width of the electrode guide groove is W, and the value of W satisfies: 0.3mm≤W≤3.5mm.

[0023] Optionally, the included angle between the two opposing guide surfaces of two adjacent electrode guide blocks is A2, and the value of A2 satisfies 25°≤A2≤75°.

[0024] Optionally, there is a gap between the sides of adjacent cells in the cell group, and a sealing adhesive is provided on each side of the cell group to seal the gap between the sides of adjacent cells in the cell group.

[0025] Optionally, potting compound is provided at the gap between the upper bracket and the battery cell assembly.

[0026] Optionally, the upper surface of the upper bracket is provided with a potting hole for injecting potting compound into the gap between the upper bracket and the battery cell assembly. The diameter of the potting hole is φ2, and the value of φ2 satisfies: 3mm≤φ2≤12mm.

[0027] Optionally, potting compound is provided in the gap between the bottom of the battery cell assembly and the lower support.

[0028] Optionally, the potting compound may be one or more of the following materials: polyurethane, epoxy resin, and polyurethane foam.

[0029] The battery pack structure provided in this application, by setting a groove and a positioning post on the upper surface of the upper bracket, and setting a corresponding positioning hole on the electrical connection piece, allows the electrical connection piece to be set in the groove, and the positioning post protruding in the groove can be inserted into the positioning hole to prevent the electrical connection piece from coming out of the groove; thus, after the battery pack structure is subjected to vibration, because the electrical connection piece is embedded and positioned in the groove of the upper bracket, it is no longer easy to shift relative to the upper bracket, thereby avoiding the occurrence of inaccurate voltage / temperature acquisition caused by vibration. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is an exploded view of the semi-finished battery pack of this application;

[0032] Figure 2 This is a schematic diagram showing the relative positions of the sealing adhesive, cell assembly, lower support, and potting adhesive between the cell assembly and the lower support in this application.

[0033] Figure 3 This is a schematic diagram showing the relative positions of the sealing adhesive, the battery cell assembly, and the lower support in this application;

[0034] Figure 4 This is a schematic diagram of the signal patch of this application mounted on the upper bracket;

[0035] Figure 5 This is a schematic diagram of the structure of the upper surface of the upper support in this application;

[0036] Figure 6 This is a schematic diagram of the lower surface of the upper support in this application;

[0037] Figure 7 for Figure 6 Schematic diagram of the cross section at point AA;

[0038] Figure 8 This is a schematic diagram of the lower support structure in this application;

[0039] Figure 9 This is a schematic diagram of the signal connection piece in this application;

[0040] Figure 10 for Figure 9 Enlarged image within the circle.

[0041] exist Figures 1-10 :

[0042] 1. Semi-finished battery pack; 2. BMS main control board; 3. Electrical connection piece; 31. Signal connection piece; 311. Signal connection body; 312. Signal connection terminal; 313. U-shaped snap-fit ​​part; 314. Cylinder body; 3141. Abutment piece; 32. Main positive bus; 33. Main negative bus; 4. Upper bracket; 41. Groove; 411. Positioning post; 412. Snap-fit ​​receiving part; 42. Electrode guide groove; 43. Electrode guide block; 44. Potting hole; 5. Cell assembly; 51. Foam; 52. Electrode; 6. Lower bracket; 61. Separator; 62. Side opening; 71. Potting compound; 72. Sealing compound; 73. Potting compound. Detailed Implementation

[0043] This application provides a battery pack structure in which an electrical connection piece is provided between the upper bracket 4 and the BMS main control board arranged parallel to the upper bracket 4, and the tabs extend from the tab guide groove 42 of the upper bracket 4 and are electrically connected to the BMS main control board. This saves the materials of the adapter board, signal connector, and some of the foam 51, which can effectively reduce material costs and improve the space utilization of the battery pack.

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] like Figure 1-4 As shown, the battery pack structure provided in this application includes a semi-finished battery pack 1, which includes:

[0046] The upper support 4 and the lower support 6 are covered. The upper support 4 is a cover and the lower support 6 is an open box. The upper support 4 can cover the opening of the lower support 6 and form a receiving cavity. Multiple electrode guide grooves 42 are opened on the upper support 4.

[0047] The cell group 5 includes multiple cells arranged along its thickness direction. The positive electrode of one cell corresponds to the negative electrode of the adjacent cell, and the negative electrode of the cell corresponds to the positive electrode of the adjacent cell, which facilitates series connection between adjacent cells.

[0048] The battery cell assembly 5 is housed in the receiving cavity, and each tab of the battery cell assembly 5 can pass through a tab guide groove 42 and be exposed on the outer surface of the upper bracket 4.

[0049] BMS main control board 2 is arranged parallel to the outside of the upper bracket 4 and maintains a gap with the upper bracket 4;

[0050] Electrical connector 3 is located between the upper bracket 4 and the BMS main control board 2. The electrode tab is electrically connected to the BMS main control board 2 through the electrical connector 3. The electrical connector 3 is made of metal, usually copper, nickel, or nickel-plated copper.

[0051] The upper surface of the upper bracket 4 is also provided with a groove 41, and a positioning post 411 is provided in the groove 41. The electrical connecting piece 3 is provided with a positioning hole, and the positioning post 411 can be inserted into the positioning hole and position the electrical connecting piece 3 in the groove 41.

[0052] The battery pack structure provided in this application, by providing a groove 41 and a positioning post 411 on the upper surface of the upper bracket 4, and providing a corresponding positioning hole on the electrical connecting piece 3, allows the electrical connecting piece 3 to be placed in the groove 41, and the positioning post 411 protruding from the groove 41 can pass through the positioning hole to prevent the electrical connecting piece 3 from falling out of the groove 41. In this way, after the battery pack structure is subjected to vibration, since the electrical connecting piece 3 is embedded and positioned in the groove 41 of the upper bracket 4, it is no longer easy to shift relative to the upper bracket 4, thus avoiding the occurrence of inaccurate voltage / temperature acquisition caused by vibration.

[0053] like Figure 5 As shown, in a preferred embodiment, the positioning hole is circumferentially provided with an upwardly protruding cylindrical body 314, that is, the lower end of the cylindrical body 314 is set on the electrical connecting piece 3. In a more preferred solution, the outer periphery of the lower end of the cylindrical body 314 coincides with the circumferential direction of the positioning hole, while the upper end of the cylindrical body 314 extends towards the BMS main control board 2. The diameter of the cylindrical body 314 gradually decreases from bottom to top, and the positioning post 411 can pass through the top of the cylindrical body 314. The diameter of the upper end of the cylindrical body 314 is less than or equal to the diameter of the positioning post 411, and the diameter of the lower end of the cylindrical body 314 is greater than the diameter of the positioning post 411. In this way, the positioning post 411 can be easily inserted from the lower end of the cylindrical body 314, and the upper end of the cylindrical body 314 can be snapped onto the positioning post 411. In this way, the electrical connecting piece 3 can be fixed to the positioning post 411 after being installed in the upper bracket 4 and obtain a certain pre-tightening force, thereby improving the assembly strength and assembly efficiency.

[0054] In a preferred embodiment, in order to facilitate the easy insertion of the positioning post 411 into the positioning hole at the lower end of the cylinder 314 without it being too loose, and to ensure that the upper end of the cylinder 314 provides a pre-tightening effect on the positioning post 411 without making insertion and removal too difficult, the ratio of the upper end hole diameter to the lower end hole diameter of the cylinder 314 is R1, and the value of R1 satisfies 0.7≤R1≤0.9.

[0055] In a preferred embodiment, in order to facilitate the easy insertion of the positioning pin 411 into the positioning hole at the lower end of the cylinder 314 without it being too loose, the lower end diameter of the positioning hole is φ1, and the value of φ1 satisfies: 0.8mm≤φ1≤2.5mm.

[0056] In a preferred embodiment, in order to ensure that the upper end of the cylinder 314 provides a pre-tightening effect on the positioning post 411 without making insertion and removal too difficult, the cylinder 314 is evenly divided into 3-6 abutment pieces 3141 along its circumference. That is, the root of the abutment piece 3141 is connected to the body of the electrical connection piece 3, while the top of the abutment piece 3141 is separated from the adjacent abutment piece 3141. The distance between the roots of adjacent abutment pieces 3141 is less than the distance between the tops of adjacent abutment pieces 3141. In this way, when the positioning post 411 is inserted into the cylinder 314, the top of the abutment piece 3141 can abut against the positioning post 411 to provide a pre-tightening force, and it also facilitates the insertion and removal of the positioning post 411.

[0057] like Figure 10 As shown, in a more preferred embodiment, the cylinder 314 is evenly divided into four abutment pieces 3141 along its circumference, which also facilitates the processing and forming of the electrical connection piece 3, the cylinder 314 and the abutment pieces 3141; in order to ensure that the upper end of the abutment piece 3141 plays a pre-tightening role on the positioning post 411 without making insertion and removal too difficult, the ratio of the distance between the roots of adjacent abutment pieces 3141 to the distance between the tops of adjacent abutment pieces 3141 is R2, and the value of R2 satisfies 0.7≤R2≤0.8.

[0058] In a preferred embodiment, in order to ensure that the upper end of the abutment piece 3141 pre-tightens the positioning post 411 without making insertion and removal too difficult, the angle between the abutment piece 3141 and the horizontal plane is A1, and the value of A1 satisfies: 100°≤A1≤150°.

[0059] like Figure 1 , 9 As shown in Figure -10, in a preferred embodiment, the electrical connection piece 3 includes a signal connection piece 31, as well as a total positive BUS 32 and a total negative BUS 33. The signal connection piece 31 is provided with a sheet-like signal connection body 311. In order to achieve electrical connection with the BMS main control board 2, one end of the signal connection body 311 in the length direction is bent upward to form a connection terminal for electrical connection with the BMS main control board 2. In order to make the signal connection piece 31 more firmly fixed in the groove 41 on the surface of the upper housing, in addition to using the positioning post 411 and the positioning hole to cooperate, the other end of the signal connection body 311 in the length direction is bent downward to form a U-shaped snap-fit ​​part 313. The groove 41 is also provided with a snap-fit ​​receiving part 412. The snap-fit ​​part 313 can snap into the snap-fit ​​receiving part 412. In this way, the signal connection body 311 has two fixed parts: the positioning hole and the snap-fit ​​part 313, thereby achieving a more secure connection with the upper housing.

[0060] like Figure 9-10As shown, in a preferred embodiment, the snap-fit ​​portion 313 includes two parallel snap-fit ​​tabs and a connecting portion connecting the two snap-fit ​​tabs. The top end of one snap-fit ​​tab is connected to the electrical connecting tab 3. The distance between the two snap-fit ​​tabs is D1, and the width of the snap-fit ​​receiving portion 412 is D2. D1 needs to be set to be larger than D2 so that the U-shaped snap-fit ​​portion 313 will deform when inserted into the snap-fit ​​receiving portion 412 to achieve snap-fit. Preferably, D1 is 5%-10% larger than D2, which can achieve snap-fit ​​and facilitate insertion and removal.

[0061] In a preferred embodiment, when the snap-fit ​​portion 313 is snapped into the snap-fit ​​receiving portion 412, the top end of the snap-fit ​​portion 313 is lower than the plane where the top of the groove 41 is located. In this way, the snap-fit ​​portion 313 does not protrude from the groove 41, thus ensuring the flatness of the upper surface of the upper bracket 4.

[0062] like Figure 6-7 As shown, in a preferred embodiment, the inner surface of the upper support 4 is further provided with a tab guide block 43. The tab guide block 43 is provided with two guide surfaces. There is an included angle between the two guide surfaces of two adjacent tab guide blocks 43 and the distance between the two guide surfaces of two adjacent tab guide blocks 43 gradually decreases from bottom to top. The gap between two adjacent tab guide blocks 43 on the upper support 4 forms a tab guide groove 42.

[0063] The length direction of the electrode guide groove 42 is consistent with the width direction of the electrode, so that the electrode can be inserted from below the electrode guide groove 42 and pass through the outer surface of the upper bracket 4. Then, the two electrodes on both sides of the electrical connection piece 3 can overlap each other on the electrical connection.

[0064] The tab guide block 43 and the tab guide groove 42 formed therefrom are used to guide the tabs of the battery cell assembly 5 through the tabs, which facilitates the process assembly and improves the assembly efficiency.

[0065] like Figure 5 As shown, in a preferred embodiment, the width of the tab guide groove 42 is W. W cannot be too small, otherwise the tab cannot be smoothly inserted into the tab guide groove 42. If it is too large, it will affect the setting and installation of the electrical connector 3. In order to smoothly guide the tab into the tab guide groove 42 and facilitate the overall installation, in this embodiment, the value of W satisfies: 0.3mm≤W≤3.5mm.

[0066] like Figure 7 As shown, in a preferred embodiment, the included angle between the two opposing guide surfaces of two adjacent electrode guide blocks 43 is A; A cannot be too small otherwise the electrode cannot pass through smoothly, and if it is too large, it will not meet the requirement of constraining and guiding the electrode; in order to allow the electrode to be smoothly introduced into the electrode guide groove 42, the value of A satisfies 25°≤A≤75°.

[0067] Normally, in order to better fix the cell assembly 5 to the upper and lower housings, potting compound is placed between the upper and lower housings and the cell assembly 5. The most vulnerable parts of the soft-pack cell are the bottom and top of the cell, so protecting the bottom and top of the cell is particularly important.

[0068] like Figure 2 , 3 As shown, in a preferred embodiment, there is a gap between the sides of adjacent cells in the cell assembly 5. In order to fill the gap and make the cell assembly 5 more securely fixed to the upper housing, a sealing adhesive 72 is provided on both sides of the cell assembly 5. The sealing adhesive 72 can seal the gap between the sides of adjacent cells in the cell assembly 5.

[0069] like Figure 2 , 3 As shown, in a preferred embodiment, in order to better fix the battery cell assembly 5 to the upper housing, a potting compound 71 is provided at the gap between the upper bracket 4 and the battery cell assembly 5; after the potting compound cures, the top of the battery cell assembly 5 and the upper bracket 4 become a whole, which can improve the mechanical reliability of the battery cell assembly 5.

[0070] like Figure 2 , 3 As shown, in a preferred embodiment, the upper surface of the upper bracket 4 is provided with a potting hole 44 for injecting potting compound into the gap between the upper bracket 4 and the battery cell assembly 5. When the battery cell assembly 5 is installed into the lower bracket 6 and the upper bracket 4 is fastened to the opening of the lower bracket 6, potting compound or foaming compound is injected through the potting hole 44 on the upper bracket 4 to fill the space between the top of the battery cell and the upper bracket 4. The diameter of the potting hole 44 is φ2. In order to make the compound flow quickly into the space between the top of the upper bracket 4 and the top of the battery cell assembly 5, the value of φ2 satisfies: 3mm≤φ2≤12mm.

[0071] like Figure 2 , 3 As shown, in a preferred embodiment, in order to make the bottom of the battery cell assembly 5 and the lower support 6 a whole, which can improve the mechanical reliability of the battery cell assembly 5, potting compound 73 is provided in the gap between the bottom of the battery cell assembly 5 and the lower support 6.

[0072] Thus, cell pack 5 adopts top and bottom potting method, without the need for overall potting, saving potting amount and reducing battery weight while ensuring the mechanical reliability of battery pack.

[0073] In a preferred embodiment, the potting compound is one or more of polyurethane, epoxy resin, and polyurethane foam.

[0074] Potting compounds are typically made of polyurethane, epoxy resin, or polyurethane foam. Before curing, the potting compound is a fluid liquid that will penetrate into the corresponding cavity space and gaps. As time increases, the potting compound will cure, and after curing, the hardness will be between Shore A45 and Shore A85, or between Shore D10 and Shore D65. Foam, on the other hand, will expand and fill the corresponding gaps in the cavity over time.

[0075] like Figure 8 As shown, in a preferred embodiment, the side wall of the lower bracket 6 is provided with side openings 62. Specifically, through holes are provided on the side walls of the lower bracket 6 on both sides perpendicular to the thickness direction of the battery cell, and two side openings 62 are provided on each side wall.

[0076] The side opening 62 facilitates the assembly of the battery cell assembly 5 into the receiving cavity of the lower bracket 6. The side length of the side opening 62 is L, and the value of L satisfies: 12mm≤L≤50mm, that is, the area of ​​a single side opening 62 is 12*12mm. 2 ~50*50mm 2 .

[0077] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0078] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0079] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.

[0080] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0081] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0082] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery pack structure, characterized in that, include: The upper support and the lower support are provided. The upper support can cover the opening of the lower support and form a receiving cavity. The upper support is provided with multiple electrode guide grooves. A battery cell assembly, comprising multiple battery cells, is disposed within the receiving cavity, wherein each tab of the battery cell assembly passes through a tab guide groove and is exposed on the outer surface of the upper support. The BMS main control board is arranged parallel to the upper bracket and maintains a gap with the upper bracket. An electrical connector is disposed between the upper bracket and the BMS main control board, and the electrode tab is electrically connected to the BMS main control board through the electrical connector; The upper surface of the upper bracket is also provided with a groove, a positioning post is provided in the groove, and a positioning hole is provided on the electrical connection piece. The positioning post can pass through the positioning hole and position the electrical connection piece in the groove. The positioning hole is provided with an upwardly protruding cylindrical body in the circumferential direction. The diameter of the cylindrical body gradually decreases from bottom to top. The positioning post can pass through the top of the cylindrical body. The upper end hole diameter of the cylindrical body is less than or equal to the diameter of the positioning post, and the lower end hole diameter of the cylindrical body is greater than the diameter of the positioning post. The electrical connector includes a signal connector, which includes a signal connector body. One end of the signal connector body is bent downward in the length direction to form a U-shaped snap-fit ​​portion. The groove is also provided with a snap-fit ​​receiving portion, which can snap into the snap-fit ​​receiving portion.

2. The battery pack structure according to claim 1, characterized in that, The ratio of the upper end diameter to the lower end diameter of the cylinder is R1, and the value of R1 satisfies 0.7≤R1≤0.

9.

3. The battery pack structure according to claim 1, characterized in that, The lower end diameter of the positioning hole is φ1, and the value of φ1 satisfies: 0.8mm≤φ1≤2.5mm.

4. The battery pack structure according to claim 1, characterized in that, The cylinder is evenly divided into 3-6 abutment pieces along its circumference, and when the positioning post is inserted into the cylinder, the top of the abutment piece can abut against the positioning post.

5. The battery pack structure according to claim 4, characterized in that, The cylinder is evenly divided into 4 abutment pieces along its circumference. The ratio of the distance between the roots of adjacent abutment pieces to the distance between the tops of adjacent abutment pieces is R2, and the value of R2 satisfies 0.7≤R2≤0.

8.

6. The battery pack structure according to claim 4, characterized in that, The angle between the abutting piece and the horizontal plane is A1, and the value of A1 satisfies: 100°≤A1≤150°.

7. The battery pack structure according to claim 1, characterized in that, The other end of the signal connection body is bent upwards along its length to form a signal connection terminal that is electrically connected to the BMS main control board.

8. The battery pack structure according to claim 7, characterized in that, The latching part includes two parallel latching tabs and a connecting part connecting the two latching tabs. The top of one latching tab is connected to the signal connecting tab. The distance between the two latching tabs is D1, and the width of the latching receiving part is D2. D1 is 5%-10% larger than D2.

9. The battery pack structure according to claim 7, characterized in that, When the snap-fit ​​part is snapped into the snap-fit ​​receiving part, the top of the snap-fit ​​part is lower than the plane where the top of the groove is located.

10. The battery pack structure according to claim 1, characterized in that, The inner surface of the upper support is also provided with a tab guide block. The tab guide block is provided with two tab guide surfaces. There is an included angle between the two tab guide surfaces of two adjacent tab guide blocks. The distance between the two tab guide surfaces of two adjacent tab guide blocks gradually decreases from bottom to top. The gap between two adjacent tab guide blocks on the upper support forms the tab guide groove.

11. The battery pack structure according to claim 10, characterized in that, The width of the electrode guide groove is W, and the value of W satisfies: 0.3mm≤W≤3.5mm.

12. The battery pack structure according to claim 10, characterized in that, The included angle between the two opposing electrode guide surfaces of two adjacent electrode guide blocks is A2, and the value of A2 satisfies 25°≤A2≤75°.

13. The battery pack structure according to claim 1, characterized in that, There is a gap between the sides of adjacent cells in the cell assembly. A sealing adhesive strip is provided on each side of the cell assembly to seal the gap between the sides of adjacent cells in the cell assembly.

14. The battery pack structure according to claim 1, characterized in that, Encapsulating adhesive is applied to the gap between the upper bracket and the battery cell assembly.

15. The battery pack structure according to claim 14, characterized in that, The upper surface of the upper bracket is provided with a potting hole for injecting potting compound into the gap between the upper bracket and the battery cell assembly. The diameter of the potting hole is φ2, and the value of φ2 satisfies: 3mm≤φ2≤12mm.

16. The battery pack structure according to claim 1, characterized in that, The gap between the bottom of the battery cell assembly and the lower support is filled with potting compound.

17. The battery pack structure according to any one of claims 14-16, characterized in that, The potting compound is made of one or more of polyurethane and epoxy resin.

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