Battery pack

Abstract

The application relates to the battery technical field, aims to solve the problem of how to make the upper cover of a battery pack not easy to separate from a cell support, and provides a battery pack which comprises a cell support, a cell, an upper cover and an upper cover connecting piece. The cell support is provided with a connecting column on one side in the height direction of the battery pack, and the connecting column is provided with a threaded hole. The cell is installed on the cell support and is configured to transmit electric energy. The upper cover is arranged on the side of the cell support provided with the connecting column, and the upper cover is provided with a through hole which is in communication with the threaded hole. The upper cover connecting piece is arranged in the through hole and the threaded hole respectively. The application has the beneficial effect of improving the connecting strength of the upper cover and the cell support, so that the upper cover is not easy to separate from the cell support.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to battery packs. Background Technology

[0002] A battery pack is provided in the related technology, including a cell support, two side covers and a top cover. The two side covers are respectively disposed on the left and right sides of the cell support, and the top cover is disposed on the top side of the cell support and connected to the cell support.

[0003] However, in related technologies, the top cover of the battery pack is prone to gaps with the cell support, making it easy for the battery pack to wobble. Utility Model Content

[0004] This application provides a battery pack to solve the problem of how to make the top cover of the battery pack less likely to separate from the cell support.

[0005] An embodiment of this application provides a battery pack, including a housing, a cell support mounted on the housing, and a cell housed in the cell support, the cell being configured to transmit electrical energy; a connecting post protrudes from one side of the cell support along the height direction of the battery pack, the connecting post having a threaded hole; a top cover of the housing is located on the side of the cell support where the connecting post is located, the top cover having a through hole communicating with the threaded hole; the battery pack further includes a top cover connector passing through the through hole and the threaded hole, the top cover connector being configured to fix the top cover to the cell support.

[0006] In the aforementioned battery pack, the top cover and the cell support are fixed together by a top cover connector, which improves the connection strength between the top cover and the cell support and makes it difficult for the top cover and the cell support to separate.

[0007] In one embodiment, the top cover includes a top wall opposite the cell support along its height direction, and a sleeve protruding from the top wall toward the cell support along its height direction. The sleeve includes a first portion and a second portion distributed along its height direction, the second portion being connected between the top wall and the first portion. A through hole passes through both the first and second portions. At least a portion of the connecting post is located in the first portion. The end of the top cover connector away from the cell support passes through the second portion.

[0008] In one embodiment, the top cover has a recessed groove that extends from the top wall toward the cell support, the recessed groove connecting to the end of the through hole away from the cell support. The end of the top cover connector away from the cell support is located within the recessed groove.

[0009] In one embodiment, the top cover connector includes a bolt head and studs connected to the bolt head. The bolt head is located within a recessed groove, and the studs are respectively inserted into a through hole and a threaded hole. The bolt head's dimension along the height direction is 0.1 mm to 0.5 mm smaller than the depth of the recessed groove.

[0010] In one embodiment, a metal component is embedded in the sleeve or connecting post.

[0011] In one embodiment, a connecting post protrudes from the upper surface of the cell support. Along the height direction, the end face of the second portion away from the cell support is spaced from the upper surface of the cell support by a first height, and the dimension of the top cover along the height direction is a second height. The ratio of the first height to the second height is between 0.25 and 0.75.

[0012] In one embodiment, the dimensions of the top cover connector along the height direction are 4 mm to 14 mm.

[0013] In one embodiment, the top cover connector is located at the center of the top cover along the length of the battery pack. The length direction intersects the height direction.

[0014] In one embodiment, there are at least two connecting posts, which are spaced apart along the width direction of the battery pack; wherein the width direction intersects the height direction. There are at least two through holes, each corresponding to one of the connecting posts. There are at least two top cover connectors, each corresponding to one of the connecting posts, and the top cover connectors are respectively inserted into the corresponding threaded holes and through holes.

[0015] In one embodiment, the battery pack further includes two side covers and at least two first side cover connectors. The two side covers are respectively disposed on both sides of the cell support along the width direction of the battery pack, and the at least two first side cover connectors correspond to the two side covers respectively; wherein the width direction intersects the height direction. The top cover extends along both sides of the width direction to the space between the two side covers and the cell support. The first side cover connectors are respectively inserted through the corresponding side cover, the top cover, and the cell support. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a battery pack provided in one embodiment of this application.

[0018] Figure 2 for Figure 1 An exploded view of the battery pack in the illustrated embodiment (only a portion of the circuit board structure is shown).

[0019] Figure 3 for Figure 1 A top view of the battery pack in the illustrated embodiment.

[0020] Figure 4 for Figure 3 A cross-sectional view of the battery pack along line AA in the illustrated embodiment.

[0021] Figure 5 for Figure 1 A perspective view of the top cover in the illustrated embodiment.

[0022] Figure 6 for Figure 1 A perspective view of the battery cell support in the illustrated embodiment.

[0023] Figure 7 for Figure 1 An exploded view of a portion of the battery pack structure in the illustrated embodiment.

[0024] Figure 8 for Figure 1 A partial structural side view of the battery pack in the illustrated embodiment.

[0025] Figure 9 for Figure 1 A side view of the side cover in the illustrated embodiment.

[0026] Figure 10 for Figure 1 A side view of the battery pack in the illustrated embodiment.

[0027] Figure 11 for Figure 10 A cross-sectional view of the battery pack along line BB in the illustrated embodiment.

[0028] Figure 12 for Figure 10 A cross-sectional view of the battery pack along line CC in the illustrated embodiment.

[0029] Figure 13 for Figure 3 A cross-sectional view of the battery pack along the DD line in the illustrated embodiment.

[0030] Figure 14 for Figure 3 A cross-sectional view of the battery pack along line EE in the illustrated embodiment.

[0031] Figure 15 for Figure 1 A top view of the battery cell support in the illustrated embodiment.

[0032] Figure 16 for Figure 1 A side view of the battery cell support in the illustrated embodiment.

[0033] Figure 17 for Figure 1 A bottom view of the battery pack in the illustrated embodiment.

[0034] Figure 18 for Figure 1 A schematic diagram of the assembly state of the circuit board and output terminals in the illustrated embodiment.

[0035] Figure 19 for Figure 3 A cross-sectional view of the battery pack along line FF in the illustrated embodiment.

[0036] Figure 20 for Figure 1 A bottom view of the top cover in the illustrated embodiment.

[0037] Figure 21 for Figure 13 A magnified view of a portion of point G in the illustrated embodiment.

[0038] Figure 22 for Figure 1 A top view of a portion of the circuit board structure in the illustrated embodiment.

[0039] Figure 23 for Figure 1 A top view of a portion of the circuit board structure in the illustrated embodiment.

[0040] Figure 24 This is a cross-sectional view of the flow passage structure perpendicular to the length direction in another embodiment of this application.

[0041] Figure 25 This is a cross-sectional view of the flow passage structure perpendicular to the length direction in another embodiment of this application.

[0042] Figure 26 for Figure 1 An exploded view of a portion of the battery pack structure in the illustrated embodiment.

[0043] Figure 27 for Figure 1 A top view of the substrate, output terminals, and fuse in the illustrated embodiment.

[0044] Figure 28 for Figure 1 Bottom view of the substrate and heat shield in the illustrated embodiment.

[0045] Explanation of key component symbols:

[0046] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0047] The technical solutions in 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.

[0048] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] Example Figure 1 This is a perspective view of a battery pack 100 provided in one embodiment of this application; Figure 2 for Figure 1 An exploded view of the battery pack 100 in the illustrated embodiment (only a portion of the circuit board 60 is shown).

[0052] See Figure 1 and Figure 2 This embodiment provides a battery pack 100 for providing or storing electrical energy to external devices. The battery pack 100 includes a housing and a cell support 30, multiple cells 40, multiple connecting pieces 50, a circuit board 60, and output terminals 150 installed within the housing.

[0053] The battery cell 40 is used to store and release electrical energy. Multiple battery cells 40 are respectively installed on the battery cell bracket 30 to arrange and position the multiple battery cells 40 in an orderly manner, preventing the battery cells 40 from shaking or colliding. The connecting piece 50 is used to connect the battery cells 40 in series and / or parallel to integrate and form the voltage and current output capability required by the external device. The circuit board 60 establishes an electrical connection with the connecting piece 50, and the circuit board 60 is equipped with an output terminal 150. One end of the output terminal 150 is connected to the battery cell 40, and the other end of the output terminal 150 can be connected to the power supply interface of the external load, so that the electrical energy stored in the battery cell 40 can be stably transmitted to the external device through the output terminal 150.

[0054] See also Figure 2 In some embodiments, the multiple connecting pieces 50 are respectively a negative connecting piece 51, a positive connecting piece 52, and multiple intermediate connecting pieces 53. The intermediate connecting pieces 53 are used to connect the positive and negative terminals of a single cell 40 in series and / or in parallel to form a battery module. The total current of the battery module flows out from the positive connecting piece 52 and flows in from the negative connecting piece 51. The circuit board 60 is provided with a positive circuit and a negative circuit (not shown). The positive circuit is connected between the output terminal 150 and the positive connecting piece 52, and the negative circuit is connected between the output terminal 150 and the negative connecting piece 51. Thus, the core path of the current in the battery pack 100 is as follows: the current flows out from the battery module formed by the multiple cells 40 connected in series and / or in parallel, flows to the positive circuit through the positive connecting piece 52, and is then output to the external load through the output terminal 150. After the current is consumed by the external load or after charging is completed, it flows back to the negative circuit from the output terminal 150 and then back to the battery module through the negative connecting piece 51, forming a complete closed loop.

[0055] For ease of understanding, this application describes the battery pack in terms of its length direction X, width direction Y, and height direction Z, hereinafter referred to as length direction X, width direction Y, and height direction Z. Multiple battery cells 40 are arranged along the length direction X and height direction Z, respectively, with each cell 40 extending along the width direction Y. In this embodiment, the multiple battery cells 40 are arranged in 5 columns along the length direction X and 3 rows along the height direction Z. In other embodiments, the number and arrangement of the battery cells 40 can be different, and are not limited here. The length direction X, width direction Y, and height direction Z are three non-parallel directions in a spatial coordinate system; in subsequent embodiments, they are described as three mutually perpendicular reference directions in a three-dimensional Cartesian coordinate system. The directions shown in this application are used to help understand the relative positions of the components, but their specific directions are not limited.

[0056] In some embodiments, the housing further includes a top cover 10 and two side covers 20, which respectively cover at least a portion of the cell support 30, thereby providing protection for internal components (cells 40, connecting pieces 50, circuit boards 60, and output terminals 150, etc.). The top cover 10 is disposed on one side of the cell support 30 along the height direction Z (second direction), and the two side covers 20 are respectively disposed on both sides of the cell support 30 along the width direction Y (first direction). The circuit board 60 and the output terminals 150 are disposed between the top cover 10 and the cell support 30. That is, the battery pack 100 is assembled by the two side covers 20 being closed from the left and right, making the structure more compact. Optionally, the circuit board 60 is mounted to the cell support 30 by fasteners (such as bolts).

[0057] In some embodiments, the battery pack 100 further includes side cover connectors, wherein the side cover connectors have at least two first side cover connectors 160 (such as screws) and at least two second side cover connectors 170. The at least two first side cover connectors 160 correspond to two side covers 20 respectively and are located on the side of the corresponding side cover 20 along the height direction Z closer to the top cover 10. The at least two second side cover connectors 170 correspond to two side covers 20 respectively and are located on the side of the corresponding side cover 20 along the height direction Z away from the top cover 10. The top cover 10 extends along both sides of the width direction Y to between the two side covers 20 and the cell support 30. The first side cover connectors 160 are respectively disposed through the corresponding side cover 20, the top cover 10, and the cell support 30 to connect the side cover 20, the top cover 10, and the cell support 30 together. Optionally, the top cover 10 has lugs 14 on both sides along the width direction Y, and the first side cover connectors 160 pass through the lugs 14. The second side cover connector 170 is respectively inserted into the corresponding side cover 20 and the cell bracket 30 to fix the bottom of the side cover 20 to the cell bracket 30.

[0058] Figure 3 for Figure 1 A top view of the battery pack 100 in the illustrated embodiment; Figure 4 for Figure 3 A cross-sectional view of the battery pack 100 along line AA in the illustrated embodiment.

[0059] See Figure 3 and Figure 4In some embodiments, the cell support 30 has a first fastening portion extending along the width direction Y (first direction) and a second fastening portion extending along the height direction Z (second direction), and threaded holes are provided in the first and second fastening portions. Further, a connecting post 33 protrudes from one side of the cell support 30 along the height direction Z, and a threaded hole 33a is provided in the connecting post 33. A top cover 10 is provided on the side of the cell support 30 where the connecting post 33 is provided, and the top cover 10 has a through hole 12a communicating with the threaded hole 33a. The battery pack 100 also includes a top cover connector 80, which passes through the through hole 12a and the threaded hole 33a respectively.

[0060] The battery pack 100, the top cover 10 and the cell support 30 are fixed by the top cover connector 80, which improves the connection strength between the top cover 10 and the cell support 30 and makes it difficult for the top cover 10 and the cell support 30 to separate.

[0061] Figure 5 for Figure 1 A perspective view of the top cover 10 in the illustrated embodiment.

[0062] In some embodiments, such as Figure 5 As shown, the upper cover 10 includes a top wall 11 that is opposite to the cell support 30 along the height direction Z, and a wall extending from the top wall 11 along the height direction Z toward the cell support 30 (see...). Figure 4 A protruding sleeve 12. The sleeve 12 includes a first portion 121 and a second portion 122 distributed along the height direction Z, the second portion 122 connecting the top wall 11 and the first portion 121. A through hole 12a passes through both the first portion 121 and the second portion 122. Figure 4 As shown, at least part of the connecting post 33 is located in the first part 121, and the end of the top cover connector 80 away from the cell support 30 passes through the second part 122. In this way, part of the sleeve 12 is wrapped around the connecting post 33, which facilitates the positioning of the top cover 10 relative to the cell support 30 when the cover is closed.

[0063] In some embodiments, such as Figure 4 As shown, the top cover 10 has a recessed groove 11a that extends from the top wall 11 toward the cell support 30, and the recessed groove 11a connects to the end of the through hole 12a away from the cell support 30. The end of the top cover connector 80 away from the cell support 30 is located within the recessed groove 11a, so that the top cover connector 80 does not protrude from the outer surface of the top cover 10, thereby making the battery pack 100 more aesthetically pleasing. Optionally, the top cover connector 80 includes a bolt head and a stud connected to the bolt head, the bolt head being located within the recessed groove 11a, and the stud passing through the through hole 12a and the threaded hole 33a respectively.

[0064] In some embodiments, the bolt head of the upper cover connector 80 is 0.1 mm to 0.5 mm smaller in the height direction Z than the depth of the recessed groove 11a, to ensure that the upper cover connector 80 is lower than the outer surface of the upper cover 10 and to reduce the difficulty of processing and assembly. It should be noted that the depth of the recessed groove 11a is the dimension of the recessed groove 11a in the height direction Z.

[0065] In some embodiments, a metal component (such as a threaded sleeve, not shown) is embedded in the sleeve 12 or the connecting post 33 to improve the structural strength of the sleeve 12 or the connecting post 33. The sleeve 12 or the connecting post 33 may be made of a high-strength plastic.

[0066] Figure 6 for Figure 1 A perspective view of the cell support 30 in the illustrated embodiment.

[0067] In some embodiments, such as Figure 6 As shown, the connecting post 33 protrudes from the upper surface of the cell support 30. Figure 4 As shown, along the height direction Z, the end face of the second part 122 away from the cell support 30 is spaced apart from the upper surface of the cell support 30 by a first height H1, and the dimension of the upper cover 10 along the height direction Z is a second height H2 (see...). Figure 2 The ratio of the first height H1 to the second height H2 is 0.25 to 0.75, which allows the height ratio of the internal space of the upper cover 10 to be adjusted according to functional priorities. For example, when the ratio of the first height H1 to the second height H2 is closer to 0.25, the solid wall thickness of the upper cover 10 is relatively high, thereby improving the structural strength of the upper cover 10. When the ratio of the first height H1 to the second height H2 is closer to 0.75, the internal space of the upper cover 10 is relatively high, thereby reducing the weight of the upper cover 10 and reserving more space to accommodate components such as the output terminal 150.

[0068] In some embodiments, the size of the top cover connector 80 along the height direction Z is 4 mm to 14 mm, so that the top cover connector 80 can stably connect the top cover 10 and the cell support 30, avoid fixing failure due to the top cover connector 80 being too short, and avoid structural interference due to the top cover connector 80 being too long.

[0069] In some embodiments, such as Figure 1 As shown, along the length direction X, the top cover connector 80 is located in the middle of the top cover 10 to avoid the functional components arranged near both ends of the battery pack 100, thereby improving space utilization.

[0070] In some embodiments, such as Figure 4As shown, there are at least two connecting posts 33, which are spaced apart along the width direction Y. There are at least two through holes 12a, each corresponding to one of the connecting posts 33. There are at least two upper cover connectors 80, each corresponding to one of the connecting posts 33. The upper cover connectors 80 are respectively inserted into the corresponding threaded holes 33a and through holes 12a, improving the connection reliability between the upper cover 10 and the cell support 30. In this embodiment, there are two connecting posts 33 and two sleeves 12.

[0071] Figure 7 for Figure 1 An exploded view of a portion of the battery pack 100 in the illustrated embodiment.

[0072] like Figure 7 As shown, during assembly of the battery pack 100, the internal components are first installed on the cell support 30, then the top cover 10 is placed on the top side of the cell support 30, and the top cover connector 80 is passed through the top cover 10 and the cell support 30 respectively. Then, the two side covers 20 are placed on the left and right sides of the cell support 30 respectively, and the first side cover connector 160 is passed through the side cover 20, the top cover 10 and the cell support 30 respectively, and the second side cover connector 170 is passed through the side cover 20 and the cell support 30 respectively. Finally, the top cover connector 80, the first side cover connector 160 and the second side cover connector 170 are tightened respectively.

[0073] Figure 8 for Figure 1 Partial structural side view of the battery pack 100 in the illustrated embodiment; Figure 9 for Figure 1 Side view of the side cover 20 in the illustrated embodiment; Figure 10 for Figure 1 Side view of the battery pack 100 in the illustrated embodiment; Figure 11 for Figure 10 A cross-sectional view of the battery pack 100 along line BB in the illustrated embodiment; Figure 12 for Figure 10 A cross-sectional view of the battery pack 100 along line CC in the illustrated embodiment.

[0074] To facilitate the positioning of the side cover 20 when it is closed, in some embodiments, such as Figure 8 As shown, the cell support 30 has a first female stop 31c on at least one side along the width direction Y. The upper cover 10 has a second female stop 13a and a first male stop 112 on the side along the width direction Y near the first female stop 31c. Figure 9 As shown, at least one side cover 20 has a second male stop 21, a third male stop 22, and a third female stop 20b respectively on the side near the cell support 30 along the width direction Y. The second male stop 21, the third male stop 22, and the third female stop 20b are distributed at intervals along the outer edge of the side cover 20. Figures 10 to 12As shown, the second male stop 21 mates with the first female stop 31c, the third male stop 22 mates with the second female stop 13a, and the third female stop 20b mates with the first male stop 112.

[0075] In this way, the male and female stops on the side cover 20 are alternately distributed and cooperate with the female and male stops on the top cover 10 and the cell support 30, respectively. This serves to position the side cover 20 relative to the top cover 10 and the cell support 30 when it is installed, and to fasten the battery pack 100 together during actual use. This improves the connection strength between the side cover 20 and the top cover 10 and the cell support 30, thereby preventing the first side cover connector 160 or the second side cover connector 170 from breaking due to shear force.

[0076] In some embodiments, such as Figure 8 As shown, there are two second female stops 13a, located at opposite ends of the upper cover 10 along the length direction X. The first male stop 112 is located between the two second female stops 13a. There are two third male stops 22, which are combined... Figure 9 As shown, the two third male stops 22 respectively mate with the two second female stops 13a, thereby improving the positioning accuracy of the side cover 20 and the top cover 10 as well as the structural strength after assembly.

[0077] In some embodiments, such as Figure 8 As shown above, the top cover 10 includes a top wall 11 disposed opposite to the cell support 30 along the height direction Z. The top cover 10 also includes two inclined walls 13, which extend outward from both ends of the top wall 11 along the length direction X toward the side closer to the cell support 30. A first male stop 112 is provided on the top wall 11. Two second female stops 13a are respectively provided on the two inclined walls 13. The inclined walls 13 extend at an incline to match the shape of the cylindrical cell 40 and the cell support 30. In this way, the top wall 11 and the inclined walls 13 are easily positioned and interlocked with the side cover 20, improving the structural strength after assembly.

[0078] In some embodiments, such as Figure 7 As shown above, the upper cover 10 also includes a lug 14. A first side cover connector 160 passes through the side cover 20, the lug 14, and the cell support 30, respectively, so that after the side cover 20 and the cell support 30 are pre-positioned through the male and female stops, the first side cover connector 160 ultimately fixes the side cover 20, the upper cover 10, and the cell support 30 together. The lug 14 protrudes from the top wall 11 along the height direction Z towards the cell support 30 and is located between the cell support 30 and the side cover 20. Figure 8As shown, the lug 14 is staggered from the first male stop 112 along the length direction X to avoid interference. Optionally, the lug 14 and the first male stop 112 are arranged adjacent to each other along the length direction X, so that the lug 14 is close to the mating area of ​​the first male stop 112, to prevent the side cover 20 from shifting when the first side cover connector 160 is tightened, ensuring the final assembly accuracy, and so that the lug 14 and the first male stop 112 together form a local high-strength structure that can work together to resist impact.

[0079] In some embodiments, there are at least two lugs 14, which are spaced apart along the length direction X. There are at least two first side cover connectors 160, which correspond one-to-one with and are connected to the at least two lugs 14, thereby further improving the connection reliability between the side cover 20 and the cell support 30 and the top cover 10.

[0080] In some embodiments, combined with Figure 8 and Figure 9 As shown, there are at least two first male stops 112, which are distributed at intervals along the length direction X. There are at least two third female stops 20b, which correspond one-to-one with and cooperate with the at least two first male stops 112 to further improve positioning accuracy and connection strength.

[0081] In some embodiments, there are at least two first female stops 31c, and the at least two first female stops 31c are respectively located at both ends of the cell support 30 along the length direction X of the battery pack. There are at least two second male stops 21, and the at least two second male stops 21 correspond one-to-one with the at least two first female stops 31c and cooperate to provide positioning for both ends of the cell support 30 and strengthen the connection strength.

[0082] In some embodiments, the first female stop 31c includes a first segment 31c1 and a second segment 31c2. The first segment 31c1 extends along the height direction Z. One end of the second segment 31c2 is connected to the end of the first segment 31c1 away from the top cover 10. The other end of the second segment 31c2 extends inwardly towards the side away from the top cover 10, so that the first female stop 31c and the second male stop 21 have a longer mating contact length to improve positioning stability and strengthen the overall structure. Moreover, the first segment 31c1 and the second segment 31c2 respectively achieve constraint from different directions to reduce positioning offset.

[0083] In some embodiments, the dimension of the third female stop 20b extending along the outer edge of the side cover 20 is 0.4 mm to 2.4 mm.

[0084] In some embodiments, the dimension of the third male stop 22 extending along the outer edge of the side cover 20 is 0.5 mm to 3 mm.

[0085] In some embodiments, the second male stop 21 has a dimension of 0.5 mm to 3 mm along the extension direction of the outer edge of the side cover 20.

[0086] In some embodiments, such as Figure 7 As shown, the side cover 20 has multiple abutment portions 23 protruding along the width direction Y near the cell support 30, and the multiple abutment portions 23 respectively abut against multiple cells 40 (see...). Figure 8 Correspondingly, the abutment portion 23 is opposite to the corresponding battery cell 40 along the width direction Y. Along the width direction Y, the abutment portions 23 of the two side covers 20 respectively abut the connecting piece 50 against the longitudinal ends of the corresponding battery cell 40 to prevent the connecting piece 50 from shaking. Optionally, each longitudinal end of each battery cell 40 corresponds to a plurality of abutment portions 23, and the plurality of abutment portions 23 corresponding to one end of the same battery cell 40 are distributed at circumferential intervals along the corresponding battery cell 40. In this embodiment, each longitudinal end of each battery cell 40 corresponds to 4 abutment portions 23. In other embodiments, the number of abutment portions 23 corresponding to each end of each battery cell 40 may also be configured in other ways, which are not limited here.

[0087] Therefore, the battery pack 100, through the cooperation of the male and female stops, allows the edges of the side cover 20 to fit into the top cover 10 and the cell support 30 respectively, strengthening the connection strength of the entire battery pack 100. The abutment portion 23 on the side cover 20 abuts against the connecting piece 50, preventing the connecting piece 50 from shaking.

[0088] Figure 13 for Figure 3 A cross-sectional view of the battery pack 100 along the DD line in the illustrated embodiment; Figure 14 for Figure 3 A cross-sectional view of the battery pack 100 along line EE in the illustrated embodiment; Figure 15 for Figure 1 A top view of the cell support 30 in the illustrated embodiment; Figure 16 for Figure 1 Side view of the cell support 30 in the illustrated embodiment; Figure 17 for Figure 1 A bottom view of the battery pack 100 in the illustrated embodiment.

[0089] To avoid overheating of the battery cells during charging (40), please refer to... Figure 13 and Figure 14 In some embodiments, the cell support 30 has a flow gap 31a, which is formed between adjacent cells 40, such as... Figure 15 As shown, the cell support 30 has a first ventilation opening 31b communicating with the flow gap 31a on one side along the height direction Z, such as... Figure 16As shown, the cell support 30 has a flow channel 31d communicating with the flow gap 31a on the other side along the height direction Z. The flow channel 31d extends along the width direction Y and penetrates the cell support 30. Figure 13 As shown, the upper cover 10 is positioned on the side of the battery cell support 30 where the first ventilation opening 31b is located. The upper cover 10 has a water inlet 10a, which penetrates the upper cover 10 and communicates with the first ventilation opening 31b. Combined with... Figure 17 As shown, a second vent 20a is provided on the side of the side cover 20 away from the first vent 31b along the height direction Z, and the second vents 20a of the two side covers 20 are respectively connected to the two ends of the flow channel 31d.

[0090] Thus, the flow gap 31a within the cell support 30 connects to the first vents 31b and the flow channels 31d on both sides, which facilitates the formation of a relatively closed cavity within the cell support 30. This allows the airflow passing through the cell 40 to carry away the heat from the cell 40 without affecting the rest of the battery pack 100. For example, the two sides of the cell support 30 along the width direction Y can form a closed structure together with the two ends of the cell 40, thereby forming a cavity within the cell support 30 where only the first vents 31b and the two ends of the flow channels 31d are connected to the outside of the cell support 30. The water inlet 10a of the top cover 10 is connected to the first vent 31b, and the second vent 20a of the side cover 20 is connected to the two ends of the flow channels 31d, allowing the airflow exiting the cell support 30 to exit the battery pack 100 from either the water inlet 10a or the second vent 20a. Furthermore, since the flow channel 31d extends along the width direction Y to both sides of the cell support 30, the connection area between the flow channel 31d and the flow gap 31a is increased, which further improves the heat dissipation effect on the cell 40 and can quickly remove the heat from the bottom cell 40.

[0091] It is understandable that the flow path formed by the water inlet 10a, the first vent 31b, the flow gap 31a, the flow channel 31d, and the second vent 20a can also allow water (such as rainwater) to flow through, thus preventing water from entering the battery pack 100 and being unable to drain. For example, water entering the battery pack 100 through the water inlet 10a on the top cover 10 can enter the flow gap 31a through the first vent 31b, and then flow out through the second vent 20a through the flow channel 31d, thereby being discharged outside the battery pack 100. Therefore, the battery pack 100, through the design of the new flow path, can effectively guide the airflow to carry away the heat of the battery cell 40, preventing the battery pack 100 from overheating during charging, and also taking into account the drainage function of the battery pack 100. It is suitable for battery packs with a compact overall structure that cause severe heat generation during charging, such as battery packs with side covers that are assembled with left and right covers.

[0092] It should be noted that, during use, either the first vent 31b or the second vent 20a can be used for air intake, and the other can be used for air exhaust. The specific airflow direction can be changed by the position and type of the fan. For example, when the fan (not shown) is located on the side of the top cover 10 away from the cell support 30, and the fan is an exhaust fan, the airflow direction within the battery pack 100 is as follows: it enters the flow channel 31d at the bottom of the cell support 30 from the second vent 20a at the bottom of the side cover 20, then enters the flow gap 31a within the cell support 30 through the flow channel 31d, and then flows out of the battery pack 100 through the first vent 31b above the cell support 30 and the water inlet 10a. When the fan is located on the side of the top cover 10 away from the cell support 30, and the fan is a blower fan, the airflow flows through the battery pack 100 along the same flow path as described above, but the airflow direction is opposite to the aforementioned flow direction. Furthermore, the aforementioned flow path can also allow water to pass through the battery pack 100. For example, water entering the battery pack 100 through the water inlet 10a of the top cover 10 can flow out of the battery pack 100 through the first vent 31b, the flow gap 31a, and the flow channel 31d. In this embodiment, air will be introduced through the second vent 20a and discharged through the first vent 31b as an example.

[0093] In some embodiments, such as Figure 14 As shown, the side cover 20 extends from the side away from the first vent 31b to the side of the cell support 30 away from the first vent 31b along the height direction Z. The second vent 20a penetrates the side cover 20 along the height direction Z, allowing airflow to pass through the second vent 20a. The flow channel 31d (see...) Figure 13 The flow path at the second vent 20a is L-shaped. The airflow passes along the height direction Z, eliminating the need for additional space in the width direction Y. The L-shaped flow path also causes a directional change in the airflow, extending its residence time within the flow path and allowing for more thorough contact between the airflow and the battery cell 40, thus improving heat dissipation efficiency. Furthermore, rainwater entering the battery pack 100 flows out of the flow channel 31d along the height direction Z through the first vent 31b at the bottom of the battery pack 100, preventing water accumulation in the flow channel 31d.

[0094] In some embodiments, such as Figure 17 As shown, each side cover 20 is provided with a plurality of second vents 20a spaced along the length direction X to improve heat dissipation and drainage efficiency.

[0095] In some embodiments, the second vent 20a is located in the middle of the side cover 20 along the length direction X of the battery pack, so that the heat dissipation of the multiple battery cells 40 arranged along the length direction X is more uniform.

[0096] In some embodiments, such as Figure 16As shown, the cell support 30 is provided with a plurality of cell holes 32a for fixing the cell 40. Along the length direction X, at least part of the flow channel 31d is located between two adjacent cell holes 32a, so that the flow channel 31d and the cell holes 32a are arranged compactly in the cell support 30, thereby improving the space utilization rate.

[0097] In some embodiments, the cross-section of the cell hole 32a perpendicular to the width direction Y is configured to be circular for mounting a cylindrical cell 40 (see...). Figure 13 The cross section of the flow channel 31d perpendicular to the width direction Y is constructed in a triangular shape to make full use of the space between adjacent cell holes 32a and to increase the flow area of ​​the flow channel 31d and improve heat dissipation capacity.

[0098] In some embodiments, such as Figure 14 As shown, the battery cell support 30 includes a hollow support body 31 and a plurality of cylindrical portions 32 disposed within the support body 31. The plurality of cylindrical portions 32 are respectively located on both sides of the support body 31 along the width direction Y, and each cylindrical portion 32 defines a battery cell hole 32a. The two ends of each battery cell 40 are respectively inserted into two opposite battery cell holes 32a along the width direction Y. A flow gap 31a is formed between the opposite cylindrical portions 32 along the width direction Y, and a first vent 31b is provided on the side of the support body 31 away from the flow channel 31d along the height direction Z. In this way, a hollow space is formed between the opposite cylindrical portions 32 along the width direction Y, increasing the size of the first vent 31b and the flow gap 31a along the width direction Y, further facilitating flow. Optionally, the battery cell 40 can be configured to close the corresponding battery cell hole 32a to prevent water or airflow from entering the battery cell hole 32a and to prevent airflow or water from entering the two ends of the battery cell 40.

[0099] In some embodiments, such as Figure 15 As shown, the shape of the first ventilation opening 31b is similar to a rectangle, which helps to increase the area of ​​the first ventilation opening 31b and reduce the processing difficulty.

[0100] In some embodiments, such as Figure 13 As shown, the water inlet 10a includes an air vent 11b that penetrates the upper cover 10 along the height direction Z. The upper cover 10 is provided with a heat dissipation vent 111 and an air guide channel 15a. The heat dissipation vent 111 has an air vent 11b, and one end of the air guide channel 15a is connected to the air vent 11b, as shown. Figure 14 As shown, the end of the air guide channel 15a away from the heat dissipation window 111 is connected to the first vent 31b to guide airflow or rainwater to flow between the air hole 11b and the first vent 31b.

[0101] In some embodiments, such as Figure 13As shown above, the top cover 10 includes a top wall 11 disposed opposite to the cell support 30 along the height direction Z. The top wall 11 is provided with a heat dissipation vent 111. The top cover 10 also includes an air guide frame 15, which extends from the periphery of the heat dissipation vent 111 along the height direction Z toward the cell support 30, and an air guide channel 15a passes through the air guide frame 15 along the height direction Z. This makes the structure of the top cover 10 simple and easy to manufacture. Optionally, the air guide frame 15 is a square frame.

[0102] Figure 18 for Figure 1 A schematic diagram of the assembly state of the circuit board 60 and the output terminal 150 in the illustrated embodiment.

[0103] In some embodiments, such as Figure 13 As shown, the vent 11b is located in the middle of the upper cover 10 along the length X direction, so as to avoid other internal components located near the two ends of the battery pack 100 along the length X direction, such as the output terminal 150 (see Figure 11b). Figure 18 ).

[0104] In some embodiments, such as Figure 14 As shown, the vent 11b is located in the middle of the upper cover 10 along the width direction Y, which is more conducive to removing heat from the middle of the battery cell 40 and preventing rainwater flowing in through the vent 11b from entering both ends of the battery cell 40.

[0105] In some embodiments, such as Figure 13 As shown, the battery pack 100 also includes a button 110 movably disposed within the upper cover 10. The water inlet 10a includes a button gap 13b formed between the button 110 and the upper cover 10, so that water entering the battery pack 100 from the button gap 13b can flow out through the bottom flow channel 31d. Optionally, the button gap 13b is located at one end of the upper cover 10 along the length direction X.

[0106] Figure 19 for Figure 3 A cross-sectional view of the battery pack 100 along line FF in the illustrated embodiment; Figure 20 for Figure 1 A bottom view of the top cover 10 in the illustrated embodiment.

[0107] In some embodiments, as previously described, combined Figure 18 and Figure 19 As shown, the output terminal 150 is located between the upper cover 10 and the cell support 30. Figure 20 As shown, the water inlet 10a includes a terminal opening 11c corresponding to the output terminal 150, so water entering the battery pack 100 from the button gap 13b can flow through the bottom channel 31d (see...). Figure 16(The air vent 11b is located between the terminal opening 11c and the button gap 13b along the length direction X, making the layout of the top cover 10 reasonable. Optionally, the terminal opening 11c is positioned opposite the output terminal 150 along the height direction Z.)

[0108] See Figure 19 In some embodiments, the cell support 30 has two first waterproof portions 311 protruding from one side along the height direction Z, and the two first waterproof portions 311 are spaced apart along the width direction Y. The top cover 10 covers the side of the cell support 30 with the first waterproof portions 311, and the top cover 10 has two second waterproof portions 16 protruding from the side of the top cover 10 near the cell support 30 along the height direction Z, and the two second waterproof portions 16 are spaced apart along the width direction Y. Along the width direction Y, the ends of both ends of the cell 40 are located outside the two first waterproof portions 311 and outside the two second waterproof portions 16, respectively. The circuit board 60 is disposed between the cell support 30 and the top cover 10, and the circuit board 60 is in contact with the first waterproof portions 311 and the second waterproof portions 16 on both sides along the height direction Z, respectively. It can be understood that the outer side of the first waterproof portion 311 is the side along the width direction Y away from the other first waterproof portion 311, and the outer side of the second waterproof portion 16 is the side along the width direction Y away from the other second waterproof portion 16.

[0109] It should be noted that the positive and negative tabs are respectively distributed at both ends of the battery cell 40, which are the core conductive components for current inflow and outflow. By providing the first waterproof part 311 and the second waterproof part 16, an isolation strip is formed at the end of the battery cell 40 to prevent water from entering through the upper cover 10 through the water inlet hole 10a (see...). Figure 20 Rainwater entering from the point flows to both ends of the longitudinal direction of the battery cell 40, thereby preventing the battery cell 40 from short-circuiting or severely self-discharging. The first waterproof part 311 and the second waterproof part 16 can be staggered along the width direction Y, or they can be arranged opposite each other along the height direction Z. The specific arrangement can be determined according to the space on both sides of the circuit board 60, and is not limited here.

[0110] In some embodiments, such as Figure 15 As shown, the first waterproof part 311 is a rib extending along the length direction X, such that the top of the first waterproof part 311 is flush with the circuit board 60 (see...). Figure 19 This forms a line contact or narrow surface contact, concentrating pressure to make the first waterproof part 311 contact the circuit board 60 more tightly, and reducing cost and manufacturing difficulty. For example, the first waterproof part 311 can be integrally formed with the cell bracket 30. Optionally, the first waterproof part 311 is a continuous rib extending to both ends of the circuit board 60 along the length direction X, to ensure that both ends of the multiple cells 40 arranged along the length direction X are waterproof.

[0111] In some embodiments, such as Figure 20As shown, the second waterproof part 16 is a rib extending along the length direction X, such that the top of the second waterproof part 16 is flush with the circuit board 60 (see...). Figure 19 This forms a line contact or narrow surface contact, concentrating pressure to make the second waterproof part 16 contact the circuit board 60 more tightly, and reducing cost and manufacturing difficulty. For example, the second waterproof part 16 can be integrally formed with the cell bracket 30. Optionally, the second waterproof part 16 is a continuous rib extending to both ends of the circuit board 60 along the length direction X, to ensure that both ends of the multiple cells 40 arranged along the length direction X are waterproof.

[0112] In some embodiments, the spacing of the first waterproof portion 311 along the width direction Y is 10 mm to 70 mm.

[0113] In some embodiments, the spacing of the second waterproof portion 16 along the width direction Y is 10 mm to 70 mm.

[0114] In some embodiments, combined with Figure 18 and Figure 19 As shown, the circuit board 60 is provided with two sets of solder joints 61a, which are spaced apart on both sides along the width direction Y and are respectively soldered to multiple connecting pieces 50. Along the width direction Y, two first waterproof parts 311 are located between the two sets of solder joints 61a, and two second waterproof parts 16 are located between the two sets of solder joints 61a, so that the first waterproof parts 311 and the second waterproof parts 16 are both located inside the two sets of solder joints 61a, preventing water from entering at the solder joints 61a.

[0115] In some embodiments, such as Figure 15 As shown above, the battery cell support 30 is provided with a first ventilation opening 31b, which is located between two first waterproof parts 311 and is used for heat dissipation and drainage.

[0116] In some embodiments, a first vent 31b is defined between the two first waterproof portions 311 along the width direction Y, which is beneficial to increase the size of the first vent 31b along the width direction Y and improve the heat dissipation efficiency of the battery cell 40.

[0117] In some embodiments, such as Figure 20 As shown above, the top cover 10 is provided with an air hole 11b. Along the width direction Y, the air hole 11b is located between the two second waterproof parts 16, so that the airflow or rainwater entering through the air hole 11b will not affect the longitudinal ends of the battery cell 40.

[0118] In some embodiments, the second waterproof portion 16 protrudes from the top wall 11 of the upper cover 10 near the cell support 30 (see...). Figure 19 On one side, the second waterproof part 16 can be integrally formed with the top cover 10, reducing cost and process difficulty.

[0119] In some embodiments, such as Figure 14 As shown, the circuit board 60 is provided with a ventilation hole 61b, which extends through the circuit board 60 along the height direction Z and communicates with the first ventilation opening 31b to allow airflow or rainwater to pass through the circuit board 60. Optionally, along the height direction Z, the ventilation hole 61b is located at the vent 11b (see... Figure 13 The space between the vent and the first vent 31b allows for smoother ventilation.

[0120] Figure 21 for Figure 13 A magnified view of a portion of point G in the illustrated embodiment.

[0121] join Figure 18 In some embodiments, the battery pack 100 also includes an indicator light switch 90 and a button 110. The indicator light switch 90 is used to turn on or off an indicator light (not shown) provided on the circuit board 60 to display the power level of the battery pack 100. The indicator light switch 90 has a soldering surface 911 and a pressing surface 9221. The soldering surface 911 is soldered to the upper surface of the circuit board 60, and the pressing surface 9221 intersects with the soldering surface 911. The button 110 is used to abut against the pressing surface 9221 to trigger the indicator light switch 90. Thus, since the pressing surface 9221 intersects with the soldering surface 911, the impact of the pressing surface 9221 on the soldering surface 911 when it is pressed is reduced, thereby reducing the risk of the indicator light switch 90 being damaged by the impact of the button 110 when the battery pack 100 is dropped. Furthermore, long-term use will not cause the soldering surface 911 to detach from the circuit board 60. Therefore, the indicator light switch 90 is securely fixed on the circuit board 60, resulting in a high safety factor. It should be noted that the upper surface of circuit board 60 refers to the surface of circuit board 60 facing away from cell support 30. Optionally, the soldering surface 911 is soldered to circuit board 60.

[0122] In some embodiments, the welding surface 911 is perpendicular to the pressing surface 9221. Since the direction of the pressing force applied by the button 110 to the pressing surface 9221 is perpendicular to the pressing surface 9221, the direction of the pressing force is parallel to the welding surface 911, thereby further reducing the pressure on the welding surface 911 when the pressing surface 9221 is pressed. It should be noted that perpendicularity within a range of 5°, or an angle between two adjacent directions between 85° and 95°, can be considered perpendicular.

[0123] Figure 22 for Figure 1 A partial top view of the circuit board 60 in the illustrated embodiment.

[0124] In some embodiments, such as Figure 22As shown, the circuit board 60 has an opening 61f and a recessed space 61c communicating with the opening 61f. The opening 61f is located at one end of the circuit board 60 along the length direction X, and the recessed space 61c penetrates at least one side of the circuit board 60 along the height direction Z. The circuit board 60 has an abutment surface 611 opposite to the opening 61f along the length direction X, and the recessed space 61c is defined between the abutment surface 611 and the opening 61f along the length direction X. Figure 21 As shown, the indicator light switch 90 includes a soldered portion 91 and a pressing portion 92. The soldered portion 91 is located above the circuit board 60 and has a soldered surface 911. The pressing portion 92 is connected to the soldered portion 91, and at least a portion of the pressing portion 92 is located within the recessed space 61c and abuts against the abutting surface 611. A pressing surface 9221 is provided on the side of the pressing portion 92 away from the abutting surface 611. Thus, when the button 110 is pressed or when the button 110 is impacted, the abutting surface 611 of the circuit board 60 provides support for the indicator light switch 90, further reducing the impact on the soldered surface 911 when the pressing surface 9221 is pressed. Furthermore, since at least a portion of the pressing portion 92 is located within the recessed space 61c, the two sides of the pressing portion 92 along the width direction Y are respectively limited and protected by the circuit board 60, further improving the fixation and reliability of the indicator light switch 90.

[0125] In some embodiments, the recessed space 61c extends through the circuit board 60 along the height direction Z, such as... Figure 21 As shown, the pressing part 92 extends out of the recessed space 61c at one end along the height direction Z away from the welding part 91, so that the dimension of the contact surface 611 in the height direction Z is the thickness of the circuit board 60, making the support of the circuit board 60 for the indicator light switch 90 more reliable.

[0126] In some embodiments, such as Figure 18 As shown, the pressing part 92 includes a pressing part body 921 and a contact protrusion 922 movably connected to the pressing part body 921. The pressing part body 921 is connected to the welding part 91, and at least a portion of the pressing part body 921 is located in the recessed space 61c (see...). Figure 22 The contact protrusion 922 protrudes from the pressing part body 921 on the side away from the abutment surface 611, and the end face of the contact protrusion 922 away from the pressing part body 921 is the pressing surface 9221 (see...). Figure 21 Thus, by pressing the contact protrusion 922 into the pressing part body 921 via button 110, the internal contacts of the indicator light switch 90 are connected, thereby triggering the switch. Optionally, the pressing part body 921 is completely embedded in the recessed space 61c.

[0127] In some embodiments, there is a gap between the pressing part body 921 and the circuit board 60 along the width direction Y to accommodate certain dimensional deviations, ensuring that the button 110 can be easily assembled, avoiding damage to the circuit board 60 or the pressing part body 921 during installation, and preventing the pressing part body 921 from being squeezed due to assembly misalignment, thus preventing the button 110 from being damaged due to uneven force.

[0128] Figure 23 for Figure 1 A partial top view of the circuit board 60 in the illustrated embodiment.

[0129] In some embodiments, Figure 23 As shown, along the length direction X, the contact protrusion 922 moves away from the pressing part body 921 (see...). Figure 18 One side extends 60 mm beyond the circuit board.

[0130] In some embodiments, such as Figure 18 As shown, at least a portion of the welded portion 91 is perpendicular to the concave space 61c along the height direction Z (see...). Figure 22 The pressing part body 921 extends from the portion of the welding part 91 opposite to the concave space 61c along the height direction Z toward the concave space 61c, so that the welding part 91 and the pressing part body 921 form a structurally reliable whole.

[0131] In some embodiments, such as Figure 18 As shown, along the width direction Y, the dimension of the welded part 91 is larger than that of the recessed space 61c (see...). Figure 22 The dimensions of the soldering part 91 are adjusted so that at least one end of the soldering part 91 along the width direction Y can contact and solder with the circuit board 60, thereby increasing the area of ​​the soldering surface 911. Optionally, both ends of the soldering part 91 along the width direction Y are connected to the circuit board 60, and the side of the soldering part 91 away from the pressing part 92 along the length direction X is connected to the circuit board 60, so that the soldering surface 911 is wrapped around the concave space 61c, further improving the connection reliability between the indicator light switch 90 and the circuit board 60.

[0132] In some embodiments, such as Figure 21 As shown, button 110 has an initial state that is spaced apart from pressing surface 9221, and a pressed state that abuts against pressing surface 9221 (not shown). In the initial state, button 110 and pressing surface 9221 are spaced apart by 0.1 mm to 0.5 mm in a direction perpendicular to pressing surface 9221 to avoid accidental triggering in the initial state. Optionally, pressing surface 9221 is perpendicular to the length direction X.

[0133] In some embodiments, the button 110 is movably disposed on the cell support 30 in a direction perpendicular to the pressing surface 9221 (i.e., the length direction X in this embodiment).

[0134] In some embodiments, the button 110 includes an operating part 1101 and an extension arm 1102. The operating part 1101 is movably disposed on one side of the cell support 30 along the length direction X. One end of the extension arm 1102 is connected to the operating part 1101, and the other end of the extension arm 1102 extends obliquely along the height direction Z toward the side closer to the indicator light switch 90 to adapt to the shape of the cell support 30. In use, the user can press the operating part 1101 into the battery pack 100 to make the button 110 abut against the pressing surface 9221.

[0135] In some embodiments, the dimension of the extension arm 1102 along the height direction Z at the end near the indicator switch 90 is greater than the dimension of the indicator switch 90 along the height direction Z, so as to ensure that the indicator switch 90 can be triggered when the button 110 is pressed.

[0136] See Figure 23 In some embodiments, as described above, the circuit board 60 is provided with a positive circuit for transmitting the total positive current and a negative circuit for transmitting the total negative current. The battery pack 100 also includes a current-carrying structure 120, which is disposed on the positive circuit and / or the negative circuit. One side surface of the current-carrying structure 120 is attached to the copper foil on the positive circuit and / or the negative circuit. In this way, by attaching the current-carrying structure 120, the current-carrying structure 120 and the positive circuit and / or the negative circuit can jointly bear the current, increasing the current carrying capacity and avoiding excessive heat generation caused by the copper foil of the positive circuit and / or the negative circuit being too narrow. In this embodiment, the current-carrying structure 120 is disposed on the negative circuit as an example.

[0137] In some embodiments, the current-carrying structure 120 is a copper strip extending along a path of a portion of the positive and / or negative circuits, which makes the current-carrying structure 120 low in cost, strong in current-carrying capacity, and high in heat dissipation efficiency.

[0138] In some embodiments, the overcurrent structure 120 includes a mounting portion 1201 mounted on the circuit board 60. The width of the mounting portion 1201 is not less than half the width of the copper foil on the positive circuit and / or negative circuit, so as to ensure smooth current transmission and avoid excessive local temperature rise caused by the mounting portion 1201 being too narrow.

[0139] In some embodiments, the width of the mounting portion 1201 is 1 mm to 10 mm to accommodate different current carrying requirements through a flexible width range, while also ensuring the stability of the mounting process and preventing the mounting portion 1201 from being too wide and affecting the layout of surrounding components. In this embodiment, the width of the mounting portion 1201 is, for example, 5 mm.

[0140] In some embodiments, the thickness of the current-carrying structure 120 is from 0.1 mm to 3 mm to adapt to different current carrying and heat dissipation requirements. In this embodiment, the thickness of the current-carrying structure 120 is, for example, 0.5 mm. It should be noted that the thickness of the current-carrying structure 120 refers to the dimension of the entire current-carrying structure 120 along the height direction Z.

[0141] Figure 24 This is a cross-sectional view of the flow passage structure 120A in another embodiment of this application, perpendicular to the length direction X.

[0142] In some embodiments, such as Figure 24 As shown, the current-carrying structure 120A also includes a suspended portion 1202 connected to the mounting portion 1201. The suspended portion 1202 protrudes from the mounting portion 1201 towards the side away from the circuit board 60, thereby further increasing the surface area and cross-sectional area of ​​the current-carrying structure 120A, thereby further improving the heat dissipation efficiency and current-carrying capacity of the current-carrying structure 120A, without affecting the arrangement of surrounding components on the circuit board 60. During processing, the mounting portion 1201 and the suspended portion 1202 can be formed by sheet metal bending. It should be noted that the current-carrying structure 120 can also include only the mounting portion 1201, and the specific shape can be set according to the current-carrying and heat dissipation requirements.

[0143] In some embodiments, the mounting portion 1201 and the suspended portion 1202 extend together along the path of a portion of the positive and / or negative circuits, and the surfaces of the mounting portion 1201 and the suspended portion 1202 intersect to strengthen the connection strength between the mounting portion 1201 and the copper foil of the positive and / or negative circuits, and further increase the heat dissipation area.

[0144] In some embodiments, the flow structure 120A has an L-shaped cross-section perpendicular to its extension direction.

[0145] Figure 25 This is a cross-sectional view of the flow passage structure 120B in another embodiment of this application, perpendicular to the length direction X.

[0146] In other embodiments, such as Figure 25 As shown, the cross-section of the flow structure 120B perpendicular to its extension direction is U-shaped to further increase the cross-sectional area of ​​the flow structure 120B perpendicular to its extension direction, thereby increasing the flow capacity and heat dissipation area of ​​the flow structure 120B.

[0147] In some embodiments, such as Figure 23As shown, the output terminal 150 is located at one end of the circuit board 60 along the length direction X, and the overcurrent structure 120 is located on one side of the circuit board 60 along the width direction Y, so as to avoid other structures or components located in the middle of the circuit board 60. The overcurrent structure 120 extends along the length direction X, which helps to increase the heat dissipation area of ​​the overcurrent structure 120 and strengthen the connection between the overcurrent structure 120 and the circuit board 60.

[0148] Figure 26 for Figure 1 An exploded view of a portion of the battery pack 100 in the illustrated embodiment.

[0149] In some embodiments, such as Figure 26 As shown, output terminal 150 and overcurrent structure 120 (see...) Figure 23 They are located on the side of the circuit board 60 away from the cell support 30.

[0150] In some embodiments, as described above, the cell support 30 has a protruding connecting post 33 for connection with the upper cover 10. For example... Figure 23 As shown, the circuit board 60 is provided with a circuit board via 61d for the connecting post 33 to pass through. The current-passing structure 120 includes a straight section 1203 and two bent sections 1204 respectively attached to the circuit board 60. The two bent sections 1204 are bent and connected to the two ends of the straight section 1203 respectively, so as to form a clearance space 120a on one side of the current-passing structure 120 to avoid the circuit board via 61d.

[0151] In some embodiments, the circuit board 60 includes a substrate 61 for providing physical support and an electrical connection base for components and wiring. Overcurrent structure 120 (see...) Figure 23 The positive and negative circuits are respectively disposed on the substrate 61.

[0152] Figure 27 for Figure 1 A top view of the substrate 61, output terminal 150, and fuse 130 in the illustrated embodiment; Figure 28 for Figure 1 Bottom view of substrate 61 and heat shield 140 in the illustrated embodiment.

[0153] To improve the safety of the battery pack 100, in some embodiments, see [reference needed]. Figure 22 The substrate 61 has a notch 61e, which extends along the circuit board 60 toward the cell support 30 (see...). Figure 26 The battery pack 100 extends through the substrate 61 in the direction of (e.g., the height direction Z in this embodiment). The battery pack 100 also includes a fuse 130 and a heat shield 140. Figure 27As shown, the fuse 130 is located on the side of the substrate 61 away from the cell support 30. The fuse 130 includes a fusing portion 1301 and two connecting portions 1302. The fusing portion 1301 is correspondingly disposed to the notch 61e, and the two connecting portions 1302 are respectively connected to the two ends of the fusing portion 1301 and respectively connected to the substrate 61. Figure 28 As shown, the heat shield 140 is installed on the side of the substrate 61 near the cell support 30 and covers the notch 61e.

[0154] Thus, when an external short circuit occurs in the battery pack 100, causing excessive heat to be generated inside the battery pack 100, the fuse 130 can melt in time, preventing safety risks to the battery pack 100. A notch 61e is provided on the substrate 61 corresponding to the fuse portion 1301 to prevent heat from the fuse 130 from affecting the circuit board 60. Furthermore, a heat shield 140 is provided between the notch 61e and the battery cell 40 to isolate the fuse 130 from the battery cell 40. For example, it prevents the fuse 130 from melting due to a short circuit and splashing onto the surface of the battery cell 40 through the notch 61e, and also prevents heat radiation from the fuse 130 to the battery cell 40 under high current conditions. Optionally, the fuse 130 is mounted on the substrate 61 using a surface mount process.

[0155] It should be noted that the circuit board 60 also includes components and circuits disposed on the substrate 61.

[0156] In some embodiments, the heat shield 140 is a mica heat shield, which reduces the thermal conductivity of the heat shield 140 and further prevents the fuse 130 from radiating heat to the battery cell 40. In other embodiments, the heat shield 140 may also be made of a material with even lower thermal conductivity, which is not limited here.

[0157] In some embodiments, the heat insulation cover 140 is bonded to the substrate 61 so that when the heat insulation cover 140 is fixed to the substrate 61, there is no need to open a hole to damage the structure of the substrate 61.

[0158] In some embodiments, such as Figure 27 As shown, the fuse 130 extends beyond the notch 61e at both ends along its length and connects to the substrate 61, ensuring a reliable connection between the fuse 130 and the substrate 61. Optionally, the length direction of the fuse 130 is parallel to the length direction X of the battery pack.

[0159] In some embodiments, the width of the notch 61e is greater than or equal to the width of the fuse portion 1301 to prevent the fuse 130 from splashing onto the circuit board 60 when it blows. Optionally, the width of the notch 61e is 1 to 3 times the width of the fuse portion 1301. Optionally, the width direction of the notch 61e and the width direction of the fuse portion 1301 are parallel to the width direction Y of the battery pack, respectively.

[0160] In some embodiments, the fuse portion 1301 is recessed on both sides along the width direction of the fuse 130, making the fuse portion 1301 narrower to control the fuse position.

[0161] In some embodiments, the area of ​​the heat shield 140 projected onto the substrate 61 is greater than the area of ​​the notch 61e projected onto the substrate 61, so that the cross-sectional area of ​​the heat shield 140 is greater than that of the notch 61e, thereby ensuring that the heat shield 140 completely covers the notch 61e.

[0162] In some embodiments, the notch 61e and the heat shield 140 form a receiving cavity. The battery pack 100 also includes an adsorption element (not shown) located within the receiving cavity for adsorbing fusible liquid. It is understood that the receiving cavity is open along the height direction Z on the side closest to the fuse 130, and the heat shield 140 forms the bottom of the receiving cavity on the other side along the height direction Z.

[0163] In some embodiments, a gap exists between the adsorption element and the fuse 130 to avoid affecting the function of the fuse 130. Optionally, the adsorption element and the fuse 130 are spaced apart along the height direction Z.

[0164] In some embodiments, the fuse 130 is located in the positive or negative circuit of the circuit board 60, so that when the fuse 130 blows, it can directly cut off the current of the entire circuit, thereby improving safety. In this embodiment, the fuse 130 is located in the negative circuit as an example.

[0165] Therefore, in the aforementioned battery pack 100, the multiple battery cells 40 output a total current through the positive terminal connector 52. This total current flows through the positive terminal loop on the circuit board 60 to the output terminal 150. When the current returns to the battery pack 100 after passing through an external load, it flows from the output terminal 150 into the negative terminal loop, and then flows through the fuse 130 and the overcurrent structure 120, before returning to the battery cell 40 through the negative terminal connector 51, completing one current cycle. Optionally, the overcurrent structure 120 is located between the fuse 130 and the output terminal 150.

[0166] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A battery pack, comprising a housing, a cell holder mounted to the housing, and a cell received in the cell holder, the cell configured to transmit electrical energy; wherein, The cell support has a connecting post protruding on one side along the height direction of the battery pack, and the connecting post has a threaded hole; the upper cover of the housing is located on the side of the cell support with the connecting post, and the upper cover has a through hole communicating with the threaded hole; the battery pack also includes an upper cover connector passing through the through hole and the threaded hole, and the upper cover connector is configured to fix the upper cover to the cell support.

2. The battery pack according to claim 1, characterized in that: The top cover includes a top wall opposite to the cell support along the height direction, and a sleeve protruding from the top wall along the height direction toward the cell support. The sleeve includes a first part and a second part distributed along the height direction, and the second part is connected between the top wall and the first part. The through hole passes through the first part and the second part respectively; At least a portion of the connecting post is located in the first portion; The end of the top cover connector away from the cell support passes through the second part.

3. The battery pack according to claim 2, characterized in that: The top cover has a recessed groove that is recessed from the top wall toward the cell support, and the recessed groove communicates with the end of the through hole away from the cell support; The end of the top cover connector away from the cell support is located in the sinking groove.

4. The battery pack according to claim 3, characterized in that: The upper cover connector includes a bolt head and a stud connected to the bolt head. The bolt head is located in the recessed groove, and the stud is respectively inserted into the through hole and the threaded hole. The bolt head is 0.1 mm to 0.5 mm smaller in dimension along the height direction than the depth of the sinkhole.

5. The battery pack according to claim 2, characterized in that: Metal components are embedded in the sleeve or the connecting column.

6. The battery pack according to claim 2, characterized in that: The connecting post protrudes from the upper surface of the battery cell bracket; Along the height direction, the end face of the second portion away from the cell support is spaced apart from the upper surface of the cell support by a first height, and the dimension of the upper cover along the height direction is a second height; The ratio of the first height to the second height is between 0.25 and 0.

75.

7. The battery pack according to claim 1, characterized in that: The dimensions of the top cover connector along the height direction are 4 mm to 14 mm.

8. The battery pack according to claim 1, characterized in that: Along the length of the battery pack, the top cover connector is located in the middle of the top cover; The length direction intersects the height direction.

9. The battery pack according to claim 1, characterized in that: There are at least two connecting posts, and the at least two connecting posts are spaced apart along the width direction of the battery pack; wherein the width direction intersects the height direction; There are at least two through holes, and each hole corresponds to one of the connecting posts. The upper cover connector has at least two parts, each corresponding to one of the connecting posts, and the upper cover connector is respectively inserted into the corresponding threaded hole and the through hole. The battery pack further includes two side covers and at least two first side cover connectors. The two side covers are respectively disposed on both sides of the cell support along the width direction of the battery pack, and the at least two first side cover connectors correspond to the two side covers respectively; wherein, the width direction intersects the height direction. The top cover extends along both sides of the width direction to the space between the two side covers and the battery cell support; The first side cover connector is respectively inserted into the corresponding side cover, the top cover and the cell bracket. 10.A battery pack, comprising a housing, a cell holder mounted to the housing, and a cell received in the cell holder, the cell configured to transmit electrical energy; characterized in that: The cell support has a first fastening portion extending in a first direction and a second fastening portion extending in a second direction, the first direction and the second direction being angled together, and threaded holes provided in the first fastening portion and the second fastening portion; the housing has an upper cover and a side cover mounted on the cell support and connectors respectively connected to the upper cover and the side cover, the side cover being disposed on the cell support along the first direction; the upper cover being disposed on the cell support along the second direction; the connector has a side cover connector connecting the cell support and the side cover and an upper cover connector connecting the cell support and the upper cover; the upper cover connector is configured to fix the upper cover to the cell support.

11. The battery pack of claim 10, wherein: The first direction is perpendicular to the second direction.

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