Battery pack structure

Abstract

A battery pack structure, comprising an upper case (4) and a lower case (6) that can form an accommodating cavity, a battery cell group (5), a BMS main control board (2) and an electrical connection sheet (3). Tab guide slots (42) are formed on the upper case (4). The battery cell group (5) is arranged in the accommodating cavity, and tabs (52) of battery cells can pass through the tab guide slots (42) and extend out of the outer surface of the upper case (4). The BMS main control board (2) is basically arranged in parallel on the upper case (4) and keeps a gap with the upper case (4). The electrical connection sheet (3) is arranged between the upper case (4) and the BMS main control board (2), and the tabs (52) are electrically connected to the BMS main control board (2) by means of the electrical connection sheet (3). A groove (41) is further formed in the upper surface of the upper case (4), positioning columns (411) are arranged in the groove (41), positioning holes are formed in the electrical connection sheet (3), and the positioning columns (411) can pass through the positioning holes and position the electrical connection sheet (3) in the groove (41). According to the battery pack structure, the groove (41) and the positioning columns (411) are arranged on the upper surface of the upper case (4), the corresponding positioning holes are formed in the electrical connection sheet (3), and the positioning columns (411) pass through the positioning holes to enable the electrical connection sheet (3) to be embedded in the groove (41) and positioned.

Description

Battery pack structure Technical Field

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

[0002] At present, the trend of cordless cleaning appliances (vacuum cleaners, steam machines, floor scrubbers, etc.) and power tools is becoming more and more obvious. Cordless operation brings a lot of convenience and enables people to use tools more flexibly in life and work.

[0003] There are two main types of battery cells used in cleaning appliance batteries and power tool batteries: cylindrical cells and pouch cells. Each has its own advantages and disadvantages. Cylindrical cells offer low cost and high production volume, but also offer slightly lower performance. Pouch cells offer better performance but are more expensive and have poorer mechanical reliability.

[0004] Summary of the Invention

[0005] In light of this, the present application provides a battery pack structure that provides a groove and positioning posts on the upper surface of an upper bracket, and a corresponding positioning hole on an electrical connector. The positioning posts are inserted into the positioning holes to embed the electrical connector into the groove and position it, preventing it from falling out of the groove. In this way, after the battery pack structure is subjected to vibration, the electrical connector is embedded and positioned in the groove of the upper bracket, making it less likely to shift relative to the upper bracket, thereby preventing inaccurate voltage and temperature data from being collected due to vibration.

[0006] In order to achieve the above objectives, this application provides the following technical solutions.

[0007] A battery pack structure, comprising:

[0008] An upper bracket and a lower bracket, wherein the upper bracket can cover the opening of the lower bracket to form a receiving cavity, and the upper bracket is provided with a plurality of tab guide grooves;

[0009] A battery cell group, comprising a plurality of battery cells, wherein the battery cell group is disposed in the accommodating cavity, and each tab of the battery cell group can pass through one of the tab guide grooves and extend out of the outer surface of the upper bracket;

[0010] A BMS main control board (also known as a BMS battery protection board) is substantially parallel to the upper bracket and maintains a gap with the upper bracket;

[0011] An electrical connection piece is provided between the upper bracket and the BMS main control board, and the tab is electrically connected to the BMS main control board through the electrical connection piece;

[0012] The upper surface of the upper bracket is further provided with a groove, a positioning column is provided in the groove, and a positioning hole is provided on the electrical connection piece. The positioning column can pass through the positioning hole and position the electrical connection piece in the groove.

[0013] Optionally, an upwardly protruding cylinder is provided around the circumference of the positioning hole, and the positioning post can pass through the top of the cylinder.

[0014] Optionally, the diameter of the cylinder gradually decreases from bottom to top, the hole diameter at the upper end of the cylinder is less than or equal to the diameter of the positioning column, and the hole diameter at the lower end of the cylinder is greater than the diameter of the positioning column.

[0015] 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.

[0016] Optionally, the lower end diameter of the positioning hole is The value of satisfies:

[0017] Optionally, the cylinder is evenly divided into a plurality of 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.

[0018] Optionally, the ratio of the distance between the roots of adjacent contact pieces to the distance between the tops of adjacent contact pieces is R2, and the value of R2 satisfies 0.7≤R2≤0.8.

[0019] Optionally, the included angle between the contact piece and the horizontal plane is A1, and the value of A1 satisfies: 100°≤A1≤150°.

[0020] Optionally, the electrical connection piece includes a signal connection piece, and the signal connection piece includes a signal connection body, and one end of the signal connection body in the longitudinal direction is bent upward to form a signal connection terminal electrically connected to the BMS main control board.

[0021] Optionally, the other end of the signal connection body in the length direction is bent downward to form a U-shaped clamping portion, and the groove is further provided with a clamping accommodating portion, and the clamping portion can be clamped in the clamping accommodating portion.

[0022] Optionally, the snap-fitting portion includes two parallel snap-fitting pieces and a connecting portion connected between the two snap-fitting pieces, and the top end of one snap-fitting piece is connected to the signal connection body; the distance between the two snap-fitting pieces is D1, and the width of the snap-fitting accommodating portion is D2, and D1 is 5%-10% larger than D2.

[0023] Optionally, when the clamping portion is clamped in the clamping accommodating portion, the top end of the clamping portion is lower than the plane where the top of the groove is located.

[0024] Optionally, the inner surface of the upper bracket is further provided with a tab guide block, and the tab guide block is provided with two tab guide surfaces. There is an angle between the two opposite tab guide surfaces of two adjacent tab guide blocks and the distance between the two gradually decreases from bottom to top. The gap between the two adjacent tab guide blocks on the upper bracket forms the tab guide groove.

[0025] Optionally, the angle between the two opposite guide surfaces of two adjacent tab guide blocks is A2, and the value of A2 satisfies 25°≤A2≤75°.

[0026] Optionally, the width of the tab guide groove is W, and the value of W satisfies: 0.3mm≤W≤3.5mm.

[0027] Optionally, there is a gap between the sides of adjacent battery cells in the battery cell group, and a piece of sealing glue is provided on both sides of the battery cell group, and the sealing glue can seal the gap between the sides of adjacent battery cells in the battery cell group.

[0028] Optionally, a first potting glue is provided in the gap between the upper bracket and the battery cell group.

[0029] Optionally, a glue hole is provided on the upper surface of the upper bracket for injecting glue into the gap between the upper bracket and the battery cell group, and the diameter of the glue hole is The value of satisfies:

[0030] Optionally, a second potting glue is provided in the gap between the bottom of the battery cell group and the lower bracket.

[0031] Optionally, the first potting glue and the second potting glue are made of one or more materials selected from polyurethane, epoxy resin, and polyurethane foam.

[0032] The battery pack structure provided by this application provides a groove and positioning posts on the upper surface of the upper bracket, and a corresponding positioning hole on the electrical connector. The electrical connector can be positioned within the groove, and the positioning posts protruding from the groove can be inserted into the positioning hole to prevent the electrical connector from falling out of the groove. In this way, after the battery pack structure is subjected to vibration, the electrical connector is embedded and positioned in the groove of the upper bracket, and is no longer easily displaced relative to the upper bracket, thereby preventing inaccurate voltage and temperature data from being collected due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0034] FIG1 is an exploded view of a semi-finished battery pack according to an embodiment of the present application;

[0035] FIG2 is a schematic diagram of the relative positions of the sealing glue, the battery cell group, the lower bracket, and the potting glue between the battery cell group and the lower bracket in FIG1 ;

[0036] FIG3 is a schematic diagram of the relative positions of the sealing glue, the battery cell group and the lower bracket in FIG1 ;

[0037] FIG4 is a schematic diagram of a signal contact assembled on an upper bracket according to an embodiment of the present application;

[0038] FIG5 is a schematic structural diagram of the upper surface of the upper bracket according to an embodiment of the present application;

[0039] FIG6 is a schematic diagram of the lower surface of the upper bracket in FIG5 ;

[0040] FIG7 is a schematic cross-sectional view taken along line AA in FIG6 ;

[0041] FIG8 is a schematic diagram of a lower bracket according to an embodiment of the present application;

[0042] FIG9 is a schematic diagram of a signal connection sheet according to an embodiment of the present application;

[0043] FIG10 is a partial enlarged view of FIG9B .

[0044] Reference numerals:

[0045] 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 clamping part; 3131. Clamping piece; 3132. Connection part; 314. Cylinder; 3141. Abutment piece; 32. Total positive BUS; 33. Total negative BUS; 4. Upper bracket; 41. Groove; 411. Positioning column; 412. Clamping accommodating part; 42. Tab guide groove; 43. Tab guide block; 431. Guide surface; 44. Glue filling hole; 5. Battery cell group; 51. Foam; 52. Tab; 6. Lower bracket; 61. Partition; 62. Side opening; 71. First potting compound; 72. Sealing compound; 73. Second potting compound. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] As shown in Figures 1-10, the battery pack structure provided herein includes a semi-finished battery pack 1, which includes an upper bracket 4, a lower bracket 6, a cell group 5, a BMS main control board 2, and an electrical connection plate 3. The upper bracket 4 is in the form of a lid, and the lower bracket 6 is an open box. The upper bracket 4 can be placed over the opening of the lower bracket 6 to form a storage cavity. The upper bracket 4 is provided with a plurality of tab guide slots 42.

[0048] The cell group 5 includes multiple cells, arranged along its thickness. The positive tab of one cell aligns with the negative tab of an adjacent cell, and the negative tab of that cell aligns with the positive tab of another adjacent cell, facilitating series connection between adjacent cells. The cell group 5 is disposed within the housing cavity, and each tab of the cell group 5 can pass through a tab guide slot 42 and extend beyond the outer surface of the upper bracket 4.

[0049] The BMS main control board 2 is substantially arranged in parallel on the upper bracket 4 and maintains a gap with the upper bracket 4 .

[0050] The electrical connection piece 3 is provided between the upper bracket 4 and the BMS main control board 2, and the tab is electrically connected to the BMS main control board 2 through the electrical connection piece 3. The electrical connection piece 3 is made of metal, usually a copper sheet, a nickel sheet or a nickel-plated copper sheet.

[0051] The upper surface of the upper bracket 4 is further provided with a groove 41. A positioning post 411 is provided in the groove 41, and a positioning hole is correspondingly provided on the electrical connection piece 3. The positioning post 411 can be passed through the positioning hole and position the electrical connection piece 3 in the groove 41.

[0052] The battery pack structure provided by the present application provides a groove 41 and a positioning post 411 on the upper surface of the upper bracket 4, and a corresponding positioning hole is provided on the electrical connection piece 3. This allows the electrical connection piece 3 to be positioned within the groove 41, and the positioning post 411 protruding from the groove 41 can be inserted into the positioning hole to prevent the electrical connection piece 3 from falling out of the groove 41. In this way, when the battery pack structure is subjected to vibration, because the electrical connection piece 3 is embedded and positioned in the groove 41 of the upper bracket 4, it is not easily displaced relative to the upper bracket 4, thus avoiding the occurrence of inaccurate voltage / temperature data collection caused by vibration.

[0053] As shown in Figures 9 and 10, in a preferred embodiment, an upwardly protruding cylinder 314 is provided around the circumference of the positioning hole. Specifically, the lower end of the cylinder 314 is disposed on the electrical connection plate 3. A more preferred solution is that the outer circumference of the lower end of the cylinder 314 coincides with the circumference of the positioning hole, while the upper end of the cylinder 314 extends toward the BMS main control board 2. The diameter of the cylinder 314 gradually decreases from bottom to top. The aperture at the upper end of the cylinder 314 is less than or equal to the diameter of the positioning post 411, while the aperture at the lower end of the cylinder 314 is greater than the diameter of the positioning post 411. The positioning post 411 can be extended from the top of the cylinder 314. This allows the positioning post 411 to be easily inserted from the lower end of the cylinder 314, while the upper end of the cylinder 314 can be snapped onto the positioning post 411. This allows the electrical connection plate 3 to be fixed to the positioning post 411 of the upper bracket 4 after being installed, and a certain preload force is obtained, thereby improving assembly strength and efficiency.

[0054] In a preferred embodiment, in order to facilitate the positioning column 411 to be easily inserted into the positioning hole at the lower end of the cylinder 314 without being too loose, and at the same time ensure that the upper end of the cylinder 314 pre-tightens the positioning column 411 without making it too difficult to insert and remove, the ratio of the upper end aperture to the lower end aperture 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 positioning column 411 to be easily inserted into the positioning hole at the lower end of the cylinder 314 without being too loose, the lower end diameter of the positioning hole is The value of satisfies:

[0056] In a preferred embodiment, in order to ensure that the upper end of the cylinder 314 pre-tightens 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 base of the abutment piece 3141 is connected to the main 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 bases of adjacent abutment pieces 3141 is smaller 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 pre-tightening force, and can also facilitate the insertion and removal of the positioning post 411.

[0057] As shown in Figures 9 and 10, in a more preferred embodiment, the cylindrical body 314 is evenly divided along its circumference into four abutment pieces 3141. This facilitates the processing and forming of the electrical connection piece 3, the cylindrical body 314, and the abutment pieces 3141. To ensure that the upper ends of the abutment pieces 3141 pre-tighten the positioning posts 411 without making insertion and removal too difficult, the ratio of the distance between the bases 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 column 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] As shown in Figures 1, 4, 9, and 10, in a preferred embodiment, the electrical connection piece 3 includes a signal connection piece 31, a total positive BUS (also known as a total positive tab connection piece) 32, and a total negative BUS (also known as a total negative tab connection piece) 33. The signal connection piece 31 is provided with a sheet-shaped signal connection body 311. To achieve electrical connection with the BMS main control board 2, one end of the signal connection body 311 is bent upward along its length to form a signal connection terminal 312 that is electrically connected to the BMS main control board 2. In order to enable the signal connecting piece 31 to be more firmly fixed in the groove 41 on the surface of the upper bracket 4, in addition to utilizing the positioning column 411 and the positioning hole, the other end of the signal connecting body 311 in the length direction is bent downward to form a U-shaped clamping portion 313, and the groove 41 is also provided with a clamping accommodating portion 412, and the clamping portion 313 can be clamped in the clamping accommodating portion 412. In this way, the signal connecting body 311 is fixed at two places, namely the positioning hole and the clamping portion 313, thereby achieving a more secure connection with the upper bracket 4.

[0060] As shown in Figure 9, in a preferred embodiment, the snap-fit ​​portion 313 includes two parallel snap-fit ​​pieces 3131 and a connecting portion 3132 connected between the two snap-fit ​​pieces 3131. The top end of one snap-fit ​​piece 3131 is connected to the other end of the signal connection body 311 of the electrical connection piece 3. The distance between the two snap-fit ​​pieces 3131 is D1, and the width of the snap-fitting portion 412 is D2. D1 is preferably set larger than D2 so that the U-shaped snap-fitting portion 313 deforms when inserted into the snap-fitting portion 412 to achieve snap-fit. Preferably, D1 is 5%-10% larger than D2, which ensures both snap-fit ​​and easy insertion and removal.

[0061] In a preferred embodiment, when the engaging portion 313 is engaged with the engaging accommodating portion 412, the top of the engaging portion 313 is lower than the plane of the top of the groove 41. In this way, the engaging portion 313 does not extend from the groove 41, thereby ensuring the flatness of the upper surface of the upper bracket 4.

[0062] As shown in Figures 6 and 7, in a preferred embodiment, a tab guide block 43 is further provided on the inner surface of the upper bracket 4, and the tab guide block 43 is provided with two guide surfaces 431. There is an angle between the two guide surfaces 431 opposite to each other of two adjacent tab guide blocks 43, and the distance between the two guide surfaces 431 opposite to each other of two adjacent tab guide blocks 43 gradually decreases from bottom to top, and the gap between the two adjacent tab guide blocks 43 on the upper bracket 4 forms a tab guide groove 42.

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

[0064] The tab guide block 43 and the tab guide groove 42 formed therewith are used to provide a guide for the tabs of the battery cell group 5 to penetrate therein, thereby facilitating the assembly process and improving the assembly efficiency.

[0065] As shown in FIG5 , in a preferred embodiment, the width of the tab guide slot 42 is W. W cannot be too small, otherwise the tab cannot be smoothly inserted into the tab guide slot 42. If it is too large, it will affect the arrangement and installation of the electrical connection piece 3. In order to smoothly guide the tab into the tab guide slot 42 and facilitate the overall installation, in this embodiment, the value of W satisfies the following conditions: 0.3 mm ≤ W ≤ 3.5 mm.

[0066] As shown in Figure 7, in a preferred embodiment, the angle between the two opposing guide surfaces 431 of two adjacent tab guide blocks 43 is A. A cannot be too small, otherwise the tab cannot pass smoothly through; too large a value will not provide the required restraint and guidance for the tab. To ensure smooth insertion of the tab into the tab guide slot 42, the value of A satisfies the requirement of 25° ≤ A ≤ 75°.

[0067] Typically, to better secure the cell group 5 to the upper and lower brackets 4 and 6, a first potting compound 71 and a second potting compound 73 are disposed between the upper and lower brackets 4 and 6, respectively. The most vulnerable areas of a soft-pack cell are the bottom and top of the cell, so protecting these areas is particularly important.

[0068] As shown in Figures 1 to 3, in a preferred embodiment, there is a gap between the sides of adjacent battery cells in the battery cell group 5. In order to fill the gap and make the battery cell group 5 and the upper bracket more firmly fixed, a sealing glue 72 is provided on both sides of the battery cell group 5. The sealing glue 72 can seal the gap between the sides of adjacent battery cells in the battery cell group 5.

[0069] As shown in Figures 1 and 2, in a preferred embodiment, to better secure the cell group 5 to the upper bracket 4, a first potting compound 71 is provided in the gap between the upper bracket 4 and the cell group 5. After the first potting compound cures, the top of the cell group 5 and the upper bracket 4 become a single unit, thereby improving the mechanical reliability of the cell group 5.

[0070] As shown in FIG5 , in a preferred embodiment, a glue hole 44 is provided on the upper surface of the upper bracket 4 for injecting glue into the gap between the upper bracket 4 and the battery cell group 5. When the battery cell group 5 is installed in the lower bracket 6 and the upper bracket 4 is buckled on the opening of the lower bracket 6, potting glue or foam glue is injected through the glue hole 44 provided on the upper bracket 4 so that the glue fills the space between the top of the battery cell and the upper bracket 4. The diameter of the glue hole 44 is In order to make the colloid quickly flow into the space between the upper bracket 4 and the top of the battery cell group 5, The value of satisfies:

[0071] As shown in FIG1 and FIG2 , in a preferred embodiment, in order to make the bottom of the battery cell group 5 and the lower bracket 6 become a whole and improve the mechanical reliability of the battery cell group 5 , a second potting glue 73 is provided in the gap between the bottom of the battery cell group 5 and the lower bracket 6 .

[0072] In this way, the battery cell group 5 adopts the top and bottom glue filling method instead of the whole glue filling, which saves the glue filling amount and reduces the battery weight while ensuring the mechanical reliability of the battery pack.

[0073] In a preferred embodiment, the potting glue is one or more materials selected from polyurethane, epoxy resin and polyurethane foam.

[0074] Potting compound is typically made of polyurethane, epoxy resin, or polyurethane foam. Before curing, the potting compound is a fluid liquid that seeps into the spaces and gaps within the cavity. Over time, the potting compound solidifies, reaching a hardness between Shore A45 and Shore A85, or Shore D10 and Shore D65. Foaming compound, on the other hand, expands over time, filling the gaps within the cavity.

[0075] As shown in FIG8 , in a preferred embodiment, the side wall of the lower bracket 6 is provided with a side opening 62. Specifically, the opening 62 is provided on the side wall of the lower bracket 6 perpendicular to the thickness direction of the battery cell, and two side openings 62 are provided on each side wall. The side opening 62 can better facilitate the assembly of the battery cell group 5 into the accommodating chamber 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 range of a single side opening 62 is 12*12mm 2 ~50*50mm 2 .

[0076] As shown in FIG. 2 , foam 51 is further provided between the battery cell group 5 and the side wall of the lower bracket 6 to more stably fix the battery cell group 5 and absorb impact.

[0077] As shown in FIG8 , a partition plate 61 is further provided in the middle of the lower bracket 6 .

[0078] The basic principles of this application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of this application. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit this application to necessarily being implemented using these specific details.

[0079] The block diagrams of the devices, devices, equipment, 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 will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the word "or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0080] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed or recombined, and such decomposition or recombination should be regarded as equivalent solutions of the present application.

[0081] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0082] 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 cannot be used to limit the scope of protection of this application.

[0083] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery pack structure, characterized in that: include: An upper bracket and a lower bracket, wherein the upper bracket can be covered on the opening of the lower bracket to form a receiving cavity, and a plurality of tab guide grooves are provided on the upper bracket; A battery cell group, comprising a plurality of battery cells, wherein the battery cell group is disposed in the accommodating cavity, and each tab of the battery cell group can pass through one of the tab guide grooves and extend out of the outer surface of the upper bracket; A BMS main control board is arranged substantially in parallel on the upper bracket and maintains a gap with the upper bracket; An electrical connection sheet, disposed between the upper bracket and the BMS main control board, through which the tab is electrically connected to the BMS main control board; The upper surface of the upper bracket is also provided with a groove, a positioning column is provided in the groove, and a positioning hole is provided on the electrical connection piece. The positioning column can be inserted into the positioning hole and position the electrical connection piece in the groove.

2. The battery pack structure according to claim 1, characterized in that: A cylinder protruding upward is arranged around the circumference of the positioning hole, and the positioning column can pass through the top of the cylinder.

3. The battery pack structure according to claim 2, characterized in that: The diameter of the cylinder gradually decreases from bottom to top, the hole diameter at the upper end of the cylinder is less than or equal to the diameter of the positioning column, and the hole diameter at the lower end of the cylinder is greater than the diameter of the positioning column.

4. The battery pack structure according to claim 3, characterized in that: 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.

5. The battery pack structure according to claim 3 or 4, characterized in that: The lower end diameter of the positioning hole is φ1, and the value of φ1 satisfies: 0.8mm≤φ1≤2.5mm.

6. The battery pack structure according to any one of claims 2 to 5, characterized in that: The cylinder is evenly divided into a plurality of abutment sheets along its circumference, and when the positioning post is inserted into the cylinder, the top of the abutment sheet can abut against the positioning post.

7. The battery pack structure according to claim 6, characterized in that: The ratio of the distance between the roots of adjacent contact pieces to the distance between the tops of adjacent contact pieces is R2, and the value of R2 satisfies 0.7≤R2≤0.

8.

8. The battery pack structure according to claim 6 or 7, characterized in that: The included angle between the contact piece and the horizontal plane is A1, and the value of A1 satisfies: 100°≤A1≤150°.

9. The battery pack structure according to any one of claims 1 to 8, characterized in that: The electrical connection piece includes a signal connection piece, and the signal connection piece includes a signal connection body. One end of the signal connection body in a length direction is bent upward to form a signal connection terminal electrically connected to the BMS main control board.

10. The battery pack structure according to claim 9, characterized in that: The other end of the signal connection body in the length direction is bent downward to form a U-shaped clamping portion, and the groove is further provided with a clamping accommodating portion, and the clamping portion can be clamped in the clamping accommodating portion.

11. The battery pack structure according to claim 10, characterized in that: The clamping portion includes two parallel clamping plates and a connecting portion connected between the two clamping plates, the top end of one clamping plate is connected to the signal connecting plate; the distance between the two clamping plates is D1, the width of the clamping accommodating portion is D2, and D1 is 5%-10% larger than D2.

12. The battery pack structure according to claim 10 or 11, characterized in that: When the clamping portion is clamped in the clamping accommodating portion, the top end of the clamping portion is lower than the plane where the top of the groove is located.

13. The battery pack structure according to any one of claims 1 to 12, characterized in that: The inner surface of the upper bracket is also provided with a tab guide block, and the tab guide block is provided with two tab guide surfaces. There is an angle between the two opposite tab guide surfaces of two adjacent tab guide blocks and the distance between the two gradually decreases from bottom to top. The gap between the two adjacent tab guide blocks on the upper bracket forms the tab guide groove.

14. The battery pack structure according to claim 13, characterized in that: The included angle between the two opposite guide surfaces of two adjacent tab guide blocks is A2, and the value of A2 satisfies 25°≤A2≤75°.

15. The battery pack structure according to any one of claims 1 to 14, characterized in that: The width of the tab guide groove is W, and the value of W satisfies: 0.3mm≤W≤3.5mm.

16. The battery pack structure according to any one of claims 1 to 15, characterized in that: There is a gap between the sides of adjacent battery cells in the battery cell group, and a sealing glue is respectively arranged on both sides of the battery cell group, and the sealing glue can seal the gap between the sides of adjacent battery cells in the battery cell group.

17. The battery pack structure according to any one of claims 1 to 16, characterized in that: A first potting glue is arranged at the gap between the upper bracket and the battery cell group.

18. The battery pack structure according to any one of claims 1 to 17, characterized in that: The upper surface of the upper bracket is provided with a glue injection hole for injecting glue into the gap between the upper bracket and the battery cell group. The diameter of the glue injection hole is φ2, and the value of φ2 satisfies: 3mm≤φ2≤12mm.

19. The battery pack structure according to any one of claims 1 to 18, characterized in that: A second potting glue is provided at the gap between the bottom of the battery cell group and the lower bracket.

20. The battery pack structure according to any one of claims 17 to 19, characterized in that: The first potting glue and the second potting glue are made of one or more materials selected from the group consisting of polyurethane, epoxy resin, and polyurethane foam.

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