Battery pack

Abstract

According to the battery pack provided by the invention, the problem of short circuit of the battery pack when water enters the battery pack is solved, and the safety of the battery pack is improved. Based on the above purpose, the application provides a battery pack, comprising: a housing comprising an upper cover and a pair of oppositely arranged side covers; the support comprises a plurality of sleeves, a containing cavity is defined by the sleeves, and the upper cover at least partially covers the support from the upper portion; each battery cell is at least partially accommodated in the corresponding accommodating cavity, and the side covers cover the two ends, in the axial direction of the battery cells, of the sleeve; the drainage hole is formed in the side cover, the interior of the shell is communicated with the outside through the drainage hole, and at least part of the drainage hole is located below the containing cavity. According to the battery pack provided by the invention, water entering the shell is discharged out of the shell through the water discharging hole, and the water is prevented from being accumulated in the shell, so that the situation that the water flows into the accommodating cavity to cause cell corrosion or short circuit is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0002] With the development of science and technology, electric tools have become an important kind of living supplies in human life. When the electric tools are used, the battery pack needs to support the power supply of the electric tools.

[0003] The battery pack is usually composed of multiple battery cells. At present, when the battery pack is filled with water, the water cannot be discharged in time, which may cause the battery cells of the battery pack to be immersed in water and short-circuit between the multiple battery cells. CONTENT

[0004] Therefore, the present application aims to provide a battery pack to solve the problem of short-circuit of the battery pack caused by water filling and increase the safety of the battery pack.

[0005] To achieve the above purpose, the present application provides a battery pack, which comprises:

[0006] a shell, the shell comprising an upper cover and a pair of side covers arranged oppositely;

[0007] a support, the support comprising multiple sleeves, the sleeves enclosing a receiving cavity, and the upper cover at least partially covering the support from above;

[0008] a plurality of battery cells, each battery cell being at least partially received in a corresponding receiving cavity, and the side cover covering both ends of the sleeve along the axial direction of the battery cell;

[0009] a drain hole arranged on the side cover, the drain hole being in communication with the inside of the shell and the outside, and the drain hole being at least partially located below the receiving cavity.

[0010] Optionally, the battery pack further comprises a drain channel in communication with the drain hole, the drain channel being at least partially formed at the end of the support along the axial direction of the battery cell; the drain channel is configured to guide the water entering the shell to the drain hole so as to discharge the water out of the shell.

[0011] Optionally, the drain channel is formed between the adjacent sleeves.

[0012] Optionally, the battery pack further comprises at least one connecting piece, the adjacent battery cells being electrically connected through the connecting piece; both ends of the sleeve are provided with a protruding part along the axial direction of the battery cell, and at least one protruding part at least partially surrounds the corresponding connecting piece.

[0013] Optionally, the battery pack further comprises a drain channel in communication with the drain hole, the drain channel being formed between the adjacent protruding parts, and the drain channel being configured to guide the water entering the shell to the drain hole so as to discharge the water out of the shell.

[0014] Optionally, a sealing member is further included, which is arranged between the side cover and the protruding portion; the sealing member is configured to be pressed against the protruding portion when the side cover is mounted on the support, so as to at least partially seal the connecting piece in the space surrounded by the protruding portion.

[0015] Optionally, the side cover includes an end wall covering one end of the sleeve along the axial direction of the battery cell, and a peripheral wall extending from the end wall towards the bottom surface of the shell, the peripheral wall at least partially covering the sleeve from below; the at least one drain hole is arranged on the peripheral wall.

[0016] Optionally, a gap is provided between the peripheral wall and the sleeve, and the gap is in communication with the drain hole.

[0017] Optionally, the shell further includes a bottom wall arranged opposite to the upper cover, and at least a portion of the bottom wall is formed by the support.

[0018] Optionally, the battery cell is a cylindrical battery cell, and the battery cell includes an electrode end and a circumferential surface; the sleeve includes an integral insulation wall wrapping the circumferential surface of the battery cell.

[0019] As can be seen from the above, the battery pack provided by the present application uses the drain hole to drain the water entering the shell out of the shell, so as to avoid water accumulation in the shell, thereby avoiding water flowing into the receiving cavity to cause the battery cell to rust or short circuit. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art descriptions. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 is a structural diagram of the battery pack in an embodiment of the present application;

[0022] Figure 2 is an exploded view of the structure of the battery pack in an embodiment of the present application;

[0023] Figure 3 is a partial structure of the battery pack in an embodiment of the present application Figure 1 ;

[0024] Figure 4 is a partial structure of the battery pack in an embodiment of the present application Figure 2 ;

[0025] Figure 5 is a detail view of A in Figure 5 ;

[0026] Figure 6 is a bottom view of the partial structure of the battery pack in an embodiment of the present application

[0027] Figure 7 A cross-sectional view of a battery pack in an embodiment of the present application Figure 1 ;

[0028] Figure 8 A cross-sectional view of a battery pack in an embodiment of the present application Figure 2 ;

[0029] Figure 9 A partial exploded view in an embodiment of the present application

[0030] Figure 10 A partial structure of a battery pack in an embodiment of the present application Figure 3 ;

[0031] Figure 11 A detail view of B in Figure 10 ; DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments and with reference to the drawings.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those having ordinary skills in the art to which the present application pertains. The terms "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms "comprise", "include" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean only physical or mechanical connections, but can also include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0034] The battery pack is used to power electrical and electronic devices. The electrical devices can be power tools, household appliances, chargers, adapters, etc. The power tools include but are not limited to grass trimmers, pruning machines, chain saws, lawn mowers, cleaning machines, intelligent mowing machines, intelligent cleaning devices and sit-on mowers. The household appliances can be vacuum cleaners, hair dryers, electric fans and camping lamps, etc. The electronic devices are mobile phones, laptops, digital cameras, etc. The present application does not limit the devices powered by the battery pack.

[0035] Please refer to Figure 1 and Figure 2The battery pack 1 comprises a housing 200, a bracket 300, and a plurality of battery cells 400 accommodated in the bracket 300, wherein the housing 200 at least partially covers the bracket 300.

[0036] With reference to Figure 2 The bracket 300 comprises a plurality of sleeves 310, and each sleeve 310 encloses a receiving cavity 320, and each battery cell 400 is at least partially accommodated in a corresponding receiving cavity 320. Specifically, the sleeve 310 comprises an end face 311 located at each end of the bracket 300 along the width direction Y, and the end face 311 is arranged perpendicularly to the axial direction of the battery cell 400. The end face 311 has a mounting hole, and each battery cell 400 is accommodated in the receiving cavity 320 of each sleeve 310 through the mounting hole, and the mounting hole exposes the electrode end of the battery cell 400.

[0037] In some embodiments, the plurality of sleeves 300 are integrally formed. In some embodiments, the sleeve 300 comprises an integral insulation wall 305, and the insulation wall 305 wraps the circumferential surface of the battery cell 400. In an embodiment, at least 80% of the circumferential surface of the battery cell 400 is wrapped by the insulation wall 305. In a specific embodiment, the insulation wall 305 wraps the entire circumferential surface of the battery cell 400, so as to avoid water flowing into the receiving cavity 320 from the gap of the insulation wall 305, and avoid the circumferential surface of the battery cell 400 contacting water.

[0038] In an embodiment, the bracket can comprise a plurality of rows of sleeves arranged along the height direction. In other embodiments, the sleeve can also comprise two sub-sleeves, and the two sub-sleeves are respectively sleeved on the two ends of the battery cell.

[0039] In some embodiments, the sleeve 300 is made of a heat-conducting material, which is used to conduct the heat of the battery cell 400 to the outside, so as to facilitate the heat dissipation of the battery pack 1. In other embodiments, the sleeve 300 is made of a heat-storing material, which is used to absorb the heat of the battery cell 400, so as to prevent the battery pack 1 from being overheated.

[0040] In some embodiments, the plurality of battery cells 400 are arranged at intervals along the length direction X, and the battery cells 400 extend longitudinally along the width direction Y. In an embodiment, the battery cell 400 is a cylindrical battery cell, and the battery cell 400 comprises an electrode end and a circumferential surface, and the axial direction of the battery cell extends along the width direction Y.

[0041] In some embodiments, as Figure 4 and Figure 5 The battery pack further comprises at least one connecting sheet 410, and the electrode ends of the plurality of battery cells 400 are electrically connected to each other through the connecting sheet 410. In an embodiment, the connecting sheet 410 comprises a connecting end 412 and a signal end 411 connected to each other, the connecting end 412 is used to connect the battery cell 400 and is located at the end face of the battery cell 400 along the width direction, and the signal end 411 is used to connect the circuit board 500, and the signal end 411 is arranged to be bent relative to the connecting end 412.

[0042] Referring to Figure 1 and Figure 2 In some embodiments, the housing 200 comprises at least an upper cover 210, which at least partially covers the bracket 300 from above. In an embodiment, the upper cover 210 is provided with a guide rail assembly 211. The guide rail assembly 211 comprises two parallel guide rails, which extend along the length direction X and protrude from the upper cover 210 along the height direction Z. In an embodiment, the battery pack 1 is provided with a locking assembly 212, which is arranged between the two guide rails. The guide rail assembly 211 and the locking assembly 212 are used for detachable connection with the power tool.

[0043] In an embodiment, the upper cover 210 is provided with ventilation holes 214 for communication between the housing 200 and the outside, so as to facilitate heat dissipation of the battery pack 1, and / or slots 213 for receiving terminals of the battery pack.

[0044] The above Figures 1-5 , the X direction is the length direction, the Y direction is the width direction, and the Z direction is the height direction, wherein the length direction X, the width direction Y and the height direction Z are perpendicular to each other, the width direction Y is parallel to the axial direction of the battery cell, and the height direction Z comprises opposite upper and lower directions.

[0045] In some embodiments, the housing 200 comprises a pair of side covers 220 arranged opposite to each other, which cover the end faces 311 of the sleeves 310 at both ends, so as to enclose the receiving cavity 320. In a specific embodiment, the side cover 220 comprises an end wall 221 covering one end of the sleeve 310 along the axial direction of the battery cell 400, and a peripheral wall 222 extending from the end wall 221 towards the bottom surface of the housing 200, which at least partially covers the sleeve 310 from below.

[0046] Referring to Figure 6 and Figure 9 In some embodiments, the housing 200 comprises a bottom wall 230 arranged opposite to the upper cover 210, at least part of which is formed by the bracket 300. Specifically, the side of the bracket 300 away from the upper cover 210 protrudes to form a support portion 330, which extends along the length direction X to both ends of the bracket 300, thereby forming at least part of the bottom wall 230 of the housing 200.

[0047] In one specific embodiment, a support portion 330 is formed by protruding along the height direction Z on the area of ​​the bottom surface of the bracket 300 not covered by the peripheral wall 222. The peripheral wall 222 and the support portion 330 together form the bottom wall 230 of the housing 200. This arrangement simplifies the structure of the housing 200, allowing the bracket 300 to form part of the outer housing 200 of the battery pack, eliminating the need for an additional bottom cover and reducing the weight of the battery pack 1. Furthermore, the support portion 330 can also be configured as several spaced-apart ribs, thereby increasing the contact area with air and improving the heat dissipation efficiency of the battery pack.

[0048] In other embodiments, the housing may include an additional bottom cover (not shown) that covers the lower surface of the support from below, and the top cover and bottom cover together form a receiving cavity in which the support is mounted. The bottom cover forms the bottom wall of the battery pack that is in contact with the outside.

[0049] In some implementations, such as Figure 4 As shown, the housing 200 also includes a display wall 240, which is located at one end of the housing 200 along the length direction X. Optionally, the display wall 240 is located at one end of the bottom wall 230 along the length direction and is integrally formed with the bottom wall 230. The display wall 240 and the bracket 300 are spaced apart along the length direction X, forming a mounting cavity between the display wall 240 and the bracket 300, and the power display component is disposed within the mounting cavity. The power display component includes one or more display windows 241 disposed on the display wall 240, light guide columns 242 at least partially mounted in the mounting cavity, and one or more indicator lights disposed on the circuit board 500. The light guide columns 242 are used to guide the light emitted by the indicator lights to the display windows 241 respectively.

[0050] In one specific embodiment, the power display assembly further includes a plurality of grilles 243 protruding from the side wall of the bracket 300 facing the display wall 240. The grilles 243 extend from the top wall of the bracket 300 to the bottom of the mounting cavity. Light guides 242 are installed between adjacent grilles 243. The grilles 243 can be used to isolate the light from adjacent light guides 242.

[0051] refer to Figures 3-4 In some embodiments, the battery pack 1 further includes a barrier 600, which prevents water from flowing to the end face 311 of the sleeve 310. The barrier 600 includes a first barrier 610, which protrudes along the height direction Z from the top surface of the bracket 300 and extends along the length direction X, to prevent water from flowing to the terminals of the battery cell. In this embodiment, the first barrier 610 is used to prevent water from flowing to the terminals of the battery cell 400 along the width direction Y, thus avoiding water accumulation at the terminals of the battery cell 400 and reducing the risk of short circuit.

[0052] Specifically, the first barrier 610 is arranged on the top surface of the support 300, so that water on the top surface of the support 300 is blocked by the first barrier 610 and cannot pass through the first barrier 610. The first barrier 610 extends in the length direction X, so that water entering the first barrier 610 can flow along the first barrier 610 in the length direction X, but cannot flow along the first barrier 610 in the width direction Y and flow to the electrode end of the battery cell 400 in the width direction Y, thereby reducing the possibility of short circuit between the plurality of battery cells 400 under the conductive effect of water.

[0053] In some embodiments, the orthographic projection of the vent hole 214 and / or the slot 213 on the top surface of the support 300 is located in the space surrounded by the first barrier 610. Specifically, the battery pack terminal is connected to the power tool through the slot 213, and the battery pack terminal needs to be electrically connected to the circuit board 500 and the battery cell 400 inside the battery pack 1. The vent hole 214 needs to discharge heat generated during operation of the battery pack 1, so the vent hole 214 and / or the slot 213 of the battery pack terminal are in communication with the outside of the battery pack 1, and water from the outside can enter the battery pack 1 through the vent hole 214 and / or the slot 213. By locating the orthographic projection of the vent hole 214 and / or the slot 213 on the top surface of the support 300 in the space surrounded by the first barrier 610, water entering the housing 200 from the vent hole 214 and / or the slot 213 can directly flow into the space surrounded by the first barrier 610, avoiding contact with the electrode end of the battery cell 400 or the connecting piece 410.

[0054] Reference Figure 6 and Figure 10 In some embodiments, the battery pack 1 further includes a drain hole 700 and a drain passage 800, wherein the drain hole 700 is arranged at the bottom of the battery pack 1 and is in communication with the outside. The drain passage 800 is used to guide water entering the housing 200 to flow from the space surrounded by the barrier 600 to the drain hole 700, so that the water is discharged from the battery pack.

[0055] In an embodiment, the drain hole 700 includes a first drain hole 710, and the drain passage 800 includes a first drain passage 810. The first drain hole 710 is arranged at the bottom of the housing 200, and the first drain hole 710 and the first drain passage 810 are arranged in correspondence in the height direction. The first drain passage 810 guides water on the top surface of the support 300 to the first drain hole 710, so as to be discharged out of the housing 200.

[0056] Specifically, the first drainage channel 810 is at least partially disposed at one end of the support 300 along the length direction. Since the one end of the support 300 along the length direction is away from the electrode end of the battery cell 400 and the connecting tab 410, disposing the first drainage channel 810 at the one end of the support 300 along the length direction can reduce the possibility of water contacting the battery cell 400 and the connecting tab 410. The first drainage hole 710 is disposed on the shell 200 or the support 300, and the first drainage channel 810 guides the water on the top surface of the support 300 to the first drainage hole 710, thereby draining the water out of the battery pack 1. The first drainage hole 710 is disposed in correspondence with the first drainage channel 810 in the height direction, reducing the flow path of the water, making the drainage more smooth, and avoiding water accumulation caused by untimely drainage.

[0057] In an embodiment, the first drainage hole 710 is opened at the bottom of the mounting cavity, the first drainage channel 810 is disposed on the side wall of the side of the support 300 facing the display wall 240, and the first drainage channel 810 is at least partially located in the mounting cavity. Further, as shown in Figure 6 and Figure 7 , the first drainage hole 710 is disposed at one end of the bottom wall 230 along the length direction. Specifically, the water in the first containment 610 enters the mounting cavity along the first drainage channel 810 and is then drained out through the first drainage hole 710. Since the entire drainage path of the first drainage channel 810 to the first drainage hole 710 extends along the circumferential direction of the battery cell 400 and does not contact the battery cell 400, the water flow to the battery cell 400 is prevented from causing a short circuit. Further, the first drainage channel 810 and the first drainage hole 710 are disposed using the space of the mounting cavity, which saves the space occupied by the first drainage channel 810, making the battery pack 1 more compact.

[0058] Referring to Figure 10 , in an embodiment, the first drainage channel 810 is formed between adjacent grids 243 to guide the water in the first containment 610 to fall into the bottom of the mounting cavity and then be drained out of the battery pack 1 through the first drainage hole 710.

[0059] In another embodiment, the first drainage channel 810 and the first drainage hole 710 are located at the side of the support 300 away from the display wall 900.

[0060] In a specific embodiment, the top surface of the support 300 away from the one end of the first drainage channel 810 is higher than the one end close to the first drainage channel 810. The top surface of the support 300 is inclinedly disposed, and water can flow along the inclined surface from the inside of the first containment 610 to the first drainage channel 810.

[0061] In some embodiments, as shown in Figure 2 and Figure 3As shown, the battery pack 1 further comprises a circuit board 500 supported on the bracket 300, the circuit board 500 being configured to control the charging and discharging of the battery pack. Specifically, the circuit board 500 is located between the upper cover 210 and the bracket 300 in the height direction Z, and a normal projection of the top surface of the bracket 300 on the circuit board 500 is at least partially located in the space enclosed by the enclosure 600. Water falling on the circuit board 500 flows along the extension direction of the circuit board 500 or through the through hole on the circuit board 500 into the enclosure 600 and is discharged through the first drainage channel 810, avoiding the water on the circuit board 500 from flowing out of the enclosure 600.

[0062] In an embodiment, as shown in Figure 3 The circuit board 500 has a through hole, and water entering from the upper portion of the shell 200 enters the enclosure 600 through the through hole.

[0063] In an embodiment, the through hole on the circuit board includes a solder hole for soldering components and / or a mounting hole for mounting the circuit board 500. The water on the upper portion of the circuit board 500 is discharged by using the existing through hole of the circuit board 500 structure, without the need to develop a new through hole, thereby reducing production costs. In another embodiment, the through hole on the circuit board is an additional through hole configured to enhance the drainage efficiency.

[0064] In an embodiment, the circuit board 500 is coated with a waterproof coating to prevent a small amount of water on the circuit board 500 from causing a short circuit of the circuit board 500.

[0065] In some embodiments, as shown in Figure 4 and Figure 7 The top surface of the bracket 300 is provided with a first support 301 in the height direction, the first support 301 being configured to support the circuit board 500, so that a first gap 302 is formed between the circuit board 500 and the top surface of the bracket 300. The first gap 302 between the circuit board 500 and the top surface of the bracket 300 is in communication with the first drainage channel 810, ensuring the unobstructedness of the first drainage channel 810 and avoiding the circuit board 500 from being immersed in water. Specifically, the first support 301 raises the circuit board 500, so that the first gap 302 is formed between the circuit board 500 and the top surface of the bracket 300.

[0066] In an embodiment, the first enclosure 610 serves as the first support 301, and the first enclosure 610 simultaneously functions to raise the circuit board 500 and limit the range of water flow.

[0067] In another embodiment, the first support 301 is a support column distributed inside the first enclosure 610. When the circuit board 500 is mounted on the bracket 300, the support column abuts against the circuit board 500, and the support column raises the circuit board 500, so that the first gap 302 is formed between the circuit board 500 and the top surface of the bracket 300.

[0068] Referring to Figure 9 In some embodiments, the drain hole 700 includes a second drain hole 720 disposed on the side cover 220, the second drain hole 720 being in communication with the inside of the housing 200 and the outside, and the second drain hole 720 being located at least partially below the receiving cavity 320 in the height direction Z. In a specific embodiment, the second drain hole 720 is disposed on the peripheral wall 222, and the second drain hole 720 is used to drain water entering the housing 200 out of the housing, so as to avoid water accumulation in the housing, thereby avoiding water flowing into the receiving cavity 320 to cause the battery cell 400 to rust or short circuit. It can be understood that in other embodiments, the second drain hole can also be disposed on the end wall, and the lowest point of the second drain hole is located below the receiving cavity.

[0069] In particular, in an embodiment, the sleeve 310 is integrally formed, the circumferential surface of the battery cell 400 is entirely wrapped by the insulating wall of the sleeve 310, and the second drain hole 720 is disposed on the side cover 220, without the need to open a hole on the support 300, so as to avoid water from contacting the circumferential surface of the battery cell 400.

[0070] Referring to Figure 10 In some embodiments, the drain passage 800 includes a second drain passage 820 in communication with the second drain hole 720, and the second drain hole 720 and the second drain passage 820 are correspondingly disposed. The second drain passage 820 is at least partially formed on the end surface 311 of the sleeve 310 in the axial direction of the battery cell. The second drain passage 820 is configured to guide the water entering the housing 200 to the second drain hole 720, so as to drain the water out of the housing 200.

[0071] In a specific embodiment, the water on the second drain passage 820 guides the water overflowing the barrier 600 on the support 300 to the second drain hole 720 and drains out through the second drain hole 720. The second drain hole 720 and the second drain passage 820 are correspondingly disposed in the height direction Z, so that the water flowing along the second drain passage 820 is more smoothly drained, and water accumulation is avoided.

[0072] In some embodiments, the second drain passage 820 is formed between adjacent sleeves 310. In a specific embodiment, as shown in Figure 8 each sleeve 310 protrudes a protruding portion 340 at both ends in the width direction Y, the protruding portion 340 at least partially surrounds the corresponding connecting piece 410, and the second drain passage 820 is formed between adjacent protruding portions 340.

[0073] Specifically, when the water entering the shell 200 is excessive, a small amount of water may overflow the enclosure 600, or the water may directly fall outside the enclosure 600, at this time, the water may fall along the end surface 311 of the sleeve 310, which has the risk of immersion of the battery cell 400. The structure of the protrusion 340 guides the water flow to the second drainage channel 820 between the two protrusions 340, and is discharged through the second drainage hole 720, avoiding the water from contacting the connecting piece 410 and the electrode end of the battery cell 400.

[0074] It should be noted that the second drainage hole 720 is correspondingly arranged in the space range that can be drained in the second drainage channel 820. Within the space range drained by the second drainage channel 820, a slight misalignment of the relative positions of the second drainage hole 720 and the second drainage channel 820 also falls within the protection scope of the present application.

[0075] In another embodiment, the insulating wall between the adjacent sleeves is concave in the width direction to form a second drainage channel, which communicates the second drainage hole with the top surface of the support, so as to timely drain the water overflowing from the top surface of the support.

[0076] Reference Figure 8 In some embodiments, the peripheral wall 222 is arranged in a spaced manner with the sleeve 310 to form a flow-through space S between the peripheral wall 222 and the sleeve 310, which communicates the second drainage channel 820 and the second drainage hole 720. Specifically, the second drainage hole 720 is arranged on the peripheral wall 222, and the end wall 221 is provided with a threaded hole, and the side cover 220 is fixed on the support 300 by screwing a screw through the threaded hole. The surface of the peripheral wall 222 on the side facing the sleeve 310 is arranged in a spaced manner with the lower surface of the sleeve 310, so that the flow-through space S is formed between the peripheral wall 222 and the sleeve 310, thereby communicating the second drainage hole 720 with the second drainage channel 820 and ensuring smooth drainage. In particular, the peripheral wall 222 is arranged in a spaced manner with the sleeve 310, which provides a buffer space for the bottom of the battery pack, preventing the side cover 220 from being deformed and pressing the sleeve 310 and the battery cell 400 when the battery pack falls or is impacted, thereby causing damage to the battery pack.

[0077] In an embodiment, the lower surface of the support 300 is concave and convex in a corresponding manner to the contour shape of the plurality of battery cells 400, and the inner surface of the side of the peripheral wall 222 facing the support 300 is concave and convex in a corresponding manner to the contour of the lower surface of the support 300. The second drainage hole 720 is arranged in the concave part of the peripheral wall 222, so that the second drainage hole 720 is located at the lowest part of the peripheral wall 222, facilitating the collection and discharge of water flow.

[0078] Reference Figure 11 The top surface of the support is convex in the height direction to form a second support 303, which is used to support the signal end 411, so that the second gap 304 is formed between the signal end 411 and the top surface of the support.

[0079] Specifically, the connecting piece 410 is used to connect the connecting end 412 of the plurality of battery cells 400 and the signal end 411 for transmitting the battery cell voltage signal to the circuit board 500. The battery cells 400 and the circuit board 500 are connected in sequence as the circuit board 500 connects the signal end 411, the signal end 411 connects the connecting end 412, and the connecting end 412 connects the plurality of battery cells 400. The structure of mutual connection can guide water, and the water on the circuit board 500 can enter the battery cells 400 along the connecting piece 410. Therefore, the second gap 304 is arranged at the position corresponding to the signal end 411 to avoid the water in the space surrounded by the first barrier 610 from contacting the signal end 411 of the connecting piece 410, and the water on the signal end can fall into the second gap 304 to prevent the water from flowing along the signal end 411 to the electrode end of the battery cell 400.

[0080] In some embodiments, as shown in FIGS. 1 and 2, the barrier 600 further includes a second barrier 620 connected with the first barrier 610. The second barrier 620 is arranged on the top surface of the support along the height direction and extends along the width direction, and at least partially surrounds the second gap 304. The space surrounded by the second barrier 620 is in communication with the space surrounded by the first barrier 610, and is used to guide the water in the second gap 304 into the first barrier 620 to avoid flowing to the battery cell 400. Figure 5 Figure 11 In some embodiments, as shown in FIGS. 1 and 2, the barrier 600 further includes a second barrier 620 connected with the first barrier 610. The second barrier 620 is arranged on the top surface of the support along the height direction and extends along the width direction, and at least partially surrounds the second gap 304. The space surrounded by the second barrier 620 is in communication with the space surrounded by the first barrier 610, and is used to guide the water in the second gap 304 into the first barrier 620 to avoid flowing to the battery cell 400.

[0081] In some embodiments, as shown in FIGS. 1 and 2, the barrier 600 further includes a second barrier 620 connected with the first barrier 610. The second barrier 620 is arranged on the top surface of the support along the height direction and extends along the width direction, and at least partially surrounds the second gap 304. The space surrounded by the second barrier 620 is in communication with the space surrounded by the first barrier 610, and is used to guide the water in the second gap 304 into the first barrier 620 to avoid flowing to the battery cell 400.

[0082] ​In some embodiments, the blocking wall 621 of the second enclosure 620 extends in the width direction, the second enclosure 620 includes two blocking walls 621 extending in the width direction and an abutting wall 622 extending in the length direction. The two blocking walls 621 are oppositely arranged in the length direction, and at least part of the two blocking walls 621 are respectively connected to the edges of the opening of the first enclosure 610, and the abutting wall 622 is connected to the ends of the two blocking walls 621 away from the opening. In addition, the edges of the blocking wall 621 in the width direction are flush with the end surface 311 of the sleeve 310 in the width direction, and the abutting wall 622 abuts the connecting piece 410 in the width direction. The abutting wall 622 can block the water in the space surrounded by the second enclosure 620 from flowing in the width direction, so as to avoid the water from contacting the connecting piece 410. The second gap 304 is completely in the space surrounded by the second enclosure 620, and the second enclosure 620 guides the water in the second gap 304 to enter the first enclosure 620 and flow out through the first drainage channel 810.

[0083] With reference to Figure 4 , Figure 5 and Figure 11 In some embodiments, the protruding portion 340 surrounds the connecting piece 410 to form a gap 350, and the signal end 411 extends through the gap 350 and is connected to the circuit board 500. Specifically, the protruding portion 340 surrounds the connecting end 412 and is disconnected at a region corresponding to the signal end 411 to form the gap 350, and the signal end 411 extends through the gap 350 and is connected to the circuit board 500.

[0084] With reference to Figure 5 and Figure 11 In some embodiments, the end surface 311 is provided with a boss 360 in the axial direction of the battery cell 400 from the gap 350, and the signal end 411 is attached to the boss 360. In the axial direction of the battery cell 400, the maximum distance between the protruding portion 340 and the end surface 311 is greater than the maximum distance between the boss 360 and the end surface 311. In a specific embodiment, when the sleeve 310 corresponding to the boss 360 is observed in the length direction X, the signal end 411 is substantially flush with the protruding portion 340. Since the connecting piece 410 has a small thickness, the signal end 411 is connected to the circuit board 500 through the gap 350, and water entering the housing 200 will enter the space surrounded by the protruding portion 340 through the gap 350. Therefore, the end surface 311 is provided with the boss 360 at the region corresponding to the gap 350, and the signal end 411 is attached to the boss 360, so as to block the gap 350 and avoid the water from contacting the connecting end 412 and the electrode end of the battery cell 400. In a specific embodiment, the boss 360 and the abutting wall 622 can be integrally arranged.

[0085] In an embodiment, as Figure 5As shown, the minimum distance G between the protrusion 340 and the signal end 411 at both ends of the area where the notch 350 is located is not greater than 0.5 mm. Specifically, due to the manufacturing tolerance, if the distance between the signal end 411 and the protrusion 340 is too small, the connection tab 410 will be difficult to assemble, so the size of the signal end 411 needs to be designed to be smaller than the size of the notch 360. However, if the distance between the signal end 411 and the protrusion 340 is too large, water will enter the space surrounded by the protrusion 340 through the gap between the signal end 411 and the protrusion 340. Therefore, in this embodiment, the minimum distance between the signal end 411 and the protrusion 340 is set to be not greater than 0.5 mm, which facilitates the assembly of the connection tab 410, and at the same time, water cannot pass through the gap between the signal end 411 and the protrusion 340 due to its own surface tension, thereby achieving the waterproof function.

[0086] In an embodiment, in the axial direction of the battery cell, the thickness of the connection tab is W, and the distance between the protrusion 340 and the end face 311 is H, where H≥W+0.2 mm. Specifically, since the connection tab 410 is usually thin, it is prone to bending and deformation during manufacturing and welding. If the protrusion height of the protrusion 340 is too low, the connection tab 410 is likely to exceed the space surrounded by the protrusion 340 after deformation, which may cause the connection tab 410 to contact water. Therefore, the protrusion height of the protrusion 340 is set to be at least 0.2 mm greater than the thickness of the connection tab 410, so that the connection end 412 is completely within the space surrounded by the protrusion 340. Further, W+0.5 mm≥H. Specifically, if the protrusion height of the protrusion 340 is too large, it will significantly affect the size of the battery pack in the width direction. By limiting the protrusion 340 to the range of W+0.5 mm≥H≥W+0.2 mm, the size of the battery pack is not significantly increased, and the connection tab 410 is prevented from contacting water.

[0087] In some embodiments, as shown in FIGS. 1A and 1B, the connection tab 410 is arranged on the side cover 220, and the protrusion 340 is arranged on the bracket 300. In some embodiments, as shown in FIGS. 2A and 2B, the connection tab 410 is arranged on the bracket 300, and the protrusion 340 is arranged on the side cover 220. Figure 2 and Figure 9 As shown in FIGS. 1A and 1B, the battery pack 1 further includes a sealing member 900 arranged between the side cover 220 and the protrusion 340. The sealing member 900 is configured to be pressed against the protrusion 340 when the side cover 220 is mounted on the bracket 300, so as to at least partially seal the connection tab 410 in the space surrounded by the protrusion 340. By cooperating with the protrusion 340, the sealing member 900 seals the connection tab 410 and the electrode end of the battery cell 400, preventing water from entering and causing short circuit or corrosion.

[0088] In an embodiment, the seal 900 is pressed against the notch 350, and when the side cover 220 is installed on the bracket 300, the seal 900 is deformed and pressed against the signal end 411 corresponding to the area of the notch 350, so as to seal the connecting end 412. Specifically, the seal 900 is a flexible gasket, and the seal 900 covers the entire end surface 311 of the sleeve 310. When the seal 900 is pressed against the protruding portion 340, the seal 900 is elastically deformed, the seal 900 corresponding to the notch 350 is extruded and pressed against the signal end 411, so as to seal the connecting end 412 in the protruding portion 340, and the space formed by the seal 900 and the signal end 411.

[0089] In an embodiment, the sleeve 340 is integrally formed, and the insulating wall of the sleeve 340 entirely wraps the circumferential surface of the battery cell 400. The seal 900 cooperates with the protruding portion 310 to seal the electrode end of the battery cell 400, so that the entire battery cell 400 is sealed in the sealed space formed by the seal 900 and the sleeve 310, and is completely isolated from the outside, thereby eliminating the possibility of water entering.

[0090] In an embodiment, the seal 900 is molded on the side surface of the side cover 220 facing the end surface 311, which facilitates assembly and avoids problems such as misalignment caused by human error during manual assembly, thereby ensuring the waterproof effect of the battery pack.

[0091] Reference Figures 1-11 The battery pack 1 comprises a shell 200 and a bracket 300. The shell 200 at least partially covers the bracket 300. The bracket 300 comprises a plurality of sleeves 310, and the sleeves 310 form a plurality of accommodation cavities 320. A plurality of battery cells 400 are arranged along the length direction X and extend along the width direction Y. Each battery cell 400 is at least partially accommodated in a corresponding accommodation cavity 320. At least one connecting plate 410 electrically connects adjacent battery cells 400. A barrier 600 is arranged to prevent water from flowing to the end surface 311 of the sleeve 310 perpendicular to the width direction. The barrier 600 comprises a first barrier 610 protruding from the top surface of the bracket 300 along the height direction Z and extending along the length direction X. The height direction Z is perpendicular to the length direction X and the width direction Y. In this embodiment, the battery pack prevents water from flowing to the end of the battery cell 400 by using the barrier 600, thereby avoiding water accumulation at the battery cell 400 and reducing the risk of short circuit.

[0092] Reference Figures 1-11The battery pack 1 comprises: a shell 200, the shell 200 comprising an upper cover 210 and a pair of side covers 220 arranged oppositely; a support 300, the support 300 comprising a plurality of sleeves 310, the sleeves 310 being arranged to form a plurality of receiving cavities 320, the upper cover 210 at least partially covering the support 300 from above; a plurality of battery cells 400, each battery cell 400 being at least partially received in a corresponding receiving cavity 320, the side covers 220 covering two ends of the battery cells 400 along an axial direction of the battery cells 400; and a drain hole 700 arranged on the side cover 220, the drain hole 700 being in communication with an inside of the shell 200 and an outside, and the drain hole 700 being at least partially located below the receiving cavities 320. In this embodiment, the battery pack uses the drain hole 700 to drain water entering the shell 200 out of the shell 200, so as to avoid accumulation of water in the shell 200, thereby avoiding water flowing into the receiving cavities 320 to cause rust or short circuit of the battery cells 400.

[0093] Reference Figures 1-11 The battery pack comprises: a shell 200, the shell 200 comprising an upper cover 210 and a pair of side covers 220 arranged oppositely; a support 300, the upper cover 210 at least partially covering the support 300 from above, the support 300 comprising a plurality of sleeves 310, the sleeves 310 being arranged to form a plurality of receiving cavities 320; a plurality of battery cells 400, the battery cells 400 being arranged at intervals along a length direction, each battery cell 400 being at least partially received in a corresponding receiving cavity 320, the sleeves 310 comprising end faces 311 arranged perpendicularly to an axial direction of the battery cells 400, the side covers 220 covering the end faces 311; at least one connecting piece 410, adjacent battery cells 400 being electrically connected through the connecting piece 410; a protruding portion 340, the protruding portion 340 being arranged to protrude from the end face 311 along the axial direction of the battery cells 400, at least one protruding portion 340 at least partially surrounding a corresponding connecting piece 410; and a sealing member 900, the sealing member 900 being arranged between the side cover 220 and the protruding portion 340, the sealing member 900 being configured to be pressed against the protruding portion 340 when the side cover 220 is mounted on the support 300, so as to at least partially seal the connecting piece 410 in a space surrounded by the protruding portion 340. In this embodiment, the battery pack uses the sealing member 900 and the protruding portion 340 to seal the connecting piece 410 and an electrode end of the battery cell 400, so as to prevent water from causing short circuit or corrosion of the battery cell 400 or the connecting piece.

[0094] Those skilled in the art should understand that the above discussion of any of the embodiments is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0095] Embodiments of the present application are intended to embrace all such alterations, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any one or more features of a given embodiment are intended to be illustrative only and not limiting of the scope of the application.

Claims

1. A battery pack, characterized in that, include: A housing, the housing including a top cover and a pair of oppositely disposed side covers; A bracket, the bracket including a plurality of sleeves forming a receiving cavity, and a top cover at least partially covering the bracket from above; Multiple battery cells, each of which is at least partially housed within a corresponding housing cavity, and the side cover covers both ends of the sleeve along the axial direction of the battery cell; A drain hole is provided on the side cover, the drain hole connects the interior of the housing to the outside, and the drain hole is at least partially located below the receiving cavity.

2. The battery pack according to claim 1, characterized in that, Also includes: A drainage channel communicating with the drainage hole, the drainage channel being at least partially formed at the end of the bracket along the axial direction of the battery cell; The drainage channel is configured to guide water entering the housing toward the drainage hole so that water can be discharged from the housing.

3. The battery pack according to claim 2, characterized in that, The drainage channel is formed between adjacent sleeves.

4. The battery pack according to claim 1, characterized in that, It also includes at least one connecting piece, through which adjacent cells are electrically connected; The sleeve has protrusions at both ends along the axial direction of the battery cell, and at least one of the protrusions at least partially surrounds the corresponding connecting piece.

5. The battery pack according to claim 4, characterized in that, It also includes a drainage channel communicating with the drainage hole, the drainage channel being formed between adjacent protrusions, the drainage channel being configured to guide water entering the housing toward the drainage hole so that water is discharged from the housing.

6. The battery pack according to claim 4, characterized in that, It also includes a seal disposed between the side cover and the protrusion; The seal is configured such that when the side cover is mounted on the bracket, the seal presses against the protrusion to at least partially seal the connecting piece within the space enclosed by the protrusion.

7. The battery pack according to claim 1, characterized in that, The side cover includes an end wall and a peripheral wall extending from the end wall toward the bottom surface of the housing. The end wall covers one end of the sleeve along the axial direction of the cell, and the peripheral wall covers the sleeve at least partially from below. At least one of the drainage holes is formed on the peripheral wall.

8. The battery pack according to claim 7, characterized in that, There is a gap between the peripheral wall and the sleeve, and the gap communicates with the drain hole.

9. The battery pack according to claim 1, characterized in that, The housing also includes a bottom wall disposed opposite to the top cover, at least a portion of which is formed by the support.

10. The battery pack according to claim 1, characterized in that, The battery cell is a cylindrical battery cell, which includes battery terminals and a circumferential surface. The sleeve includes an integral insulating wall that completely encloses the circumferential surface of the battery cell.

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