Battery pack

Abstract

The utility model provides a battery pack, which comprises: a shell, which comprises 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 adjacent battery cells are electrically connected through the connecting sheets; the two ends of the sleeve are convexly provided with lug bosses along the axial direction of the battery cell, and at least one lug boss at least partially surrounds the corresponding connecting sheet; the sealing element is arranged between the side cover and the lug boss; and the sealing piece is configured in a way that when the side cover is mounted on the bracket, the sealing piece and the convex part are pressed tightly, so that at least part of the connecting piece is sealed in a space enclosed by the convex part. According to the battery pack provided by the invention, the connecting pieces and the electrode ends of the battery cells are sealed by matching the sealing pieces with the lug bosses, so that short circuit or corrosion of the battery cells or the connecting pieces caused by water inflow is prevented.

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 a plurality of sleeves, the sleeves being enclosed to form accommodation cavities, 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 accommodated in a corresponding accommodation cavity, and the side covers covering both ends of the sleeves along the axial direction of the battery cells;

[0009] at least one connecting piece, adjacent battery cells being electrically connected through the connecting piece;

[0010] both ends of the sleeve are provided with protrusions along the axial direction of the battery cells, and at least one protrusion at least partially encloses a corresponding connecting piece;

[0011] a sealing element, the sealing element being arranged between the side cover and the protrusion; the sealing element is configured to be pressed against the protrusion when the side cover is installed on the support, so as to at least partially seal the connecting piece in the space enclosed by the protrusion.

[0012] Optionally, the battery pack further comprises a circuit board supported on the support; the connecting piece comprises a connecting end and a signal end connected to each other, the connecting end being used for connecting the battery cell and located at the end surface of the battery cell in the axial direction, and the signal end being used for connecting the circuit board; the protrusion is provided with a notch corresponding to the signal end, and the signal end extends through the notch and is bent to be connected to the circuit board.

[0013] Optionally, the sealing element is pressed against the notch, and the sealing element is deformed and abuts against the signal end to seal the connecting end.

[0014] Optionally, a boss is provided at the end of the sleeve corresponding to the notch along the axial direction of the battery cell. The boss supports the signal terminal, and the height of the protrusion is greater than the height of the boss along the axial direction of the battery cell.

[0015] Optionally, along the axial direction of the battery cell, the area of ​​the signal terminal corresponding to the boss is flush with the end of the protrusion.

[0016] Optionally, the minimum gap between the signal terminal and the protrusion shall not exceed 0.5 mm.

[0017] Optionally, the connecting piece is supported on the sleeve, the thickness of the connecting piece is W, and along the axial direction of the battery cell, the protrusion height of the protrusion relative to the side wall is H, where H≥W+0.2mm.

[0018] Optionally, it also includes a drainage channel formed between adjacent protrusions, and a drainage hole is provided on the side cover. The drainage channel is at least used to guide water entering the housing to the drainage hole so that water can be discharged from the battery pack.

[0019] Optionally, the seal is molded onto the side surface of the side cover facing the sidewall.

[0020] Optionally, it also includes a barrier that protrudes above the support and extends along the arrangement direction of the multiple cells; the barrier is used to prevent water from flowing to the axial end face of the cells.

[0021] As can be seen from the above, the battery pack provided in this application uses a sealant and a protrusion to seal the terminals of the connecting piece and the battery cell, preventing water ingress that could cause short circuits or corrosion of the battery cell or connecting piece. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of a battery pack according to one embodiment of this application;

[0024] Figure 2 This is an exploded view of the battery pack structure in one embodiment of this application;

[0025] Figure 3 This is a partial structure of a battery pack in one embodiment of this application. Figure 1 ;

[0026] Figure 4 This is a partial structure of a battery pack in one embodiment of this application. Figure 2 ;

[0027] Figure 5 For Figure 5 Detail view at A in FIG. 1;

[0028] Figure 6 Partial structure view of a battery pack in an embodiment of the present application;

[0029] Figure 7 Cross-sectional view of a battery pack in an embodiment of the present application Figure 1 ;

[0030] Figure 8 Cross-sectional view of a battery pack in an embodiment of the present application Figure 2 ;

[0031] Figure 9 Partial exploded view in an embodiment of the present application;

[0032] Figure 10 Partial structure view of a battery pack in an embodiment of the present application Figure 3 ;

[0033] Figure 11 For Figure 10 Detail view at B in FIG. 1. DETAILED DESCRIPTION

[0034] In order to make the objects, 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 drawings.

[0035] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled 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 merely used to distinguish different components. The terms "include" or "contain" 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 physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are merely used to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0036] 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 trimmer, pruning machine, chain saw, grass mower, cleaning machine, intelligent mower, intelligent cleaning device and sit-on mower. The household appliances can be vacuum cleaner, hair dryer, electric fan and camping lamp, etc. The electronic devices are mobile phone, notebook, digital camera, etc. The devices powered by the battery pack are not limited in the present application.

[0037] Please refer to Figure 1 and Figure 2 , the battery pack 1 comprises a housing 200, a bracket 300, and a plurality of battery cells 400 accommodated in the bracket 300, the housing 200 at least partially covers the bracket 300.

[0038] Referring to Figure 2 , the bracket 300 comprises a plurality of sleeves 310, the sleeves 310 enclose a plurality of accommodation cavities 320, each battery cell 400 is at least partially accommodated in a corresponding accommodation cavity 320. Specifically, the sleeve 310 comprises an end face 311 at each end of the bracket 300 along the width direction Y, the end face 311 is arranged perpendicular to the axial direction of the battery cell 400. The end face 311 has a mounting hole, each battery cell 400 is accommodated in the accommodation cavity 320 of each sleeve 310 through the mounting hole, and the mounting hole exposes the electrode end of the battery cell 400.

[0039] In some embodiments, the plurality of sleeves 300 are integrally formed. In some embodiments, the sleeve 300 comprises an integral insulation wall 305, 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, which can prevent water from flowing into the accommodation cavity 320 through the gap of the insulation wall 305 and prevent the circumferential surface of the battery cell 400 from contacting water.

[0040] 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, the two sub-sleeves are respectively sleeved on the two ends of the battery cell.

[0041] In some embodiments, the sleeve 300 is made of heat-conducting material, which is used to conduct the heat of the battery cell 400 to the outside, facilitating the heat dissipation of the battery pack 1. In other embodiments, the sleeve 300 is made of heat-storing material, which is used to absorb the heat of the battery cell 400 to prevent the battery pack 1 from overheating.

[0042] 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, 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.

[0043] In some embodiments, as shown in Figure 4 and Figure 5 The battery pack further comprises at least one connecting piece 410, and the electrode terminals of each battery cell 400 are electrically connected to each other through the connecting piece 410. In an embodiment, the connecting piece 410 comprises a connecting terminal 412 and a signal terminal 411 connected to each other, the connecting terminal 412 is used to connect the battery cell 400 and is located at the end surface of the battery cell 400 along the width direction, and the signal terminal 411 is used to connect the circuit board 500, and the signal terminal 411 is bent relative to the connecting terminal 412.

[0044] Referring to Figure 1 and Figure 2 In some embodiments, the shell 200 comprises at least an upper cover 210, and the upper cover 210 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, and the guide rail assembly 211 extends along the length direction X and is convexly arranged on the upper cover 210 along the height direction Z. In an embodiment, the battery pack 1 has a locking assembly 212 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.

[0045] In an embodiment, the upper cover 210 has a ventilation hole 214 and / or a slot 213 for receiving the battery pack terminal, and the ventilation hole 214 is used to communicate the shell 200 with the outside to facilitate heat dissipation of the battery pack 1.

[0046] In 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 includes opposite upper and lower directions.

[0047] In some embodiments, the shell 200 comprises a pair of side covers 220 arranged opposite to each other, and the side cover 220 covers the end surface 311 of the sleeve 310 at both ends, thereby enclosing 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 shell 200, and the peripheral wall 222 at least partially covers the sleeve 310 from below.

[0048] Referring to Figure 6 and Figure 9In some embodiments, the shell 200 comprises a bottom wall 230 opposite to the upper cover 210, at least part of the bottom wall 230 is formed by the bracket 300. Specifically, the bracket 300 is protruded from one side away from the upper cover 210 to form a support portion 330, the support portion 330 extends to both ends of the bracket 300 along the length direction X, thereby forming at least part of the bottom wall 230 of the shell 200.

[0049] In a specific embodiment, the bracket 300 is protruded from the bottom surface to form the support portion 330 along the height direction Z, the peripheral wall 222 and the support portion 330 jointly form the bottom wall 230 of the shell 200. Such arrangement can simplify the structure of the shell 200, so that the bracket 300 forms part of the shell 200 of the battery pack, and the additional lower cover is omitted, thereby reducing the weight of the battery pack 1. Further, the support portion 330 can also be arranged as a plurality of spaced apart ribs, thereby increasing the contact area with air and improving the heat dissipation efficiency of the battery pack.

[0050] In other embodiments, the shell can comprise an additional bottom cover (not shown), the bottom cover covers the bottom surface of the bracket from below, and the upper cover and the bottom cover jointly form a receiving cavity, the bracket is installed in the receiving cavity. The bottom cover forms the bottom wall of the battery pack in contact with the outside.

[0051] In some embodiments, as shown in Figure 4 The shell 200 further comprises a display wall 240 located at one end of the shell 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 is spaced apart from the bracket 300 along the length direction X, and a mounting cavity is formed between the display wall 240 and the bracket 300, and an electric quantity display assembly is arranged in the mounting cavity. The electric quantity display assembly comprises one or more display windows 241 arranged on the display wall 240, at least part of a light guide column 242 arranged in the mounting cavity, and one or more display lights arranged on the circuit board 500. The light guide column 242 is used for guiding the light emitted by the display lights to the display windows 241, respectively.

[0052] In a specific embodiment, the electric quantity display assembly further comprises a plurality of gratings 243 protruded from the side wall of the bracket 300 towards the display wall 240, the gratings 243 extend from the top wall of the bracket 300 to the bottom of the mounting cavity, the light guide column 242 is arranged between adjacent gratings 243, and the gratings 243 can be used to isolate the light of adjacent light guide columns 242.

[0053] Reference is made to Figures 3-4In some embodiments, the battery pack 1 further comprises a barrier 600 for preventing water from flowing to the end face 311 of the sleeve 310. The barrier 600 comprises a first barrier 610 protruding from the top surface of the bracket 300 in the height direction Z and extending in the length direction X for preventing water from flowing to the electrode end of the battery cell. In the present embodiment, the first barrier 610 is used to prevent water from flowing to the electrode end of the battery cell 400 in the width direction Y, so as to avoid water gathering at the electrode end of the battery cell 400 and reduce the risk of short circuit.

[0054] Specifically, the first barrier 610 protrudes from the top surface of the bracket 300, so that water on the top surface of the bracket 300 is blocked by the first barrier 610 and cannot pass through the first barrier 610. In addition, 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 beyond 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.

[0055] In some embodiments, the ventilation hole 214 and / or the slot 213 are located in the space surrounded by the first barrier 610 in the top view of the top surface of the bracket 300. 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 ventilation hole 214 needs to discharge the heat generated during the operation of the battery pack 1, so the ventilation 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 ventilation hole 214 and / or the slot 213. By locating the ventilation hole 214 and / or the slot 213 in the space surrounded by the first barrier 610 in the top view of the top surface of the bracket 300, water entering the housing 200 from the ventilation hole 214 and / or the slot 213 can directly flow into the space surrounded by the first barrier 610, thereby avoiding contact with the electrode end of the battery cell 400 or the connecting piece 410.

[0056] Reference Figure 6 and Figure 10 In some embodiments, the battery pack 1 further comprises a drain hole 700 and a drain channel 800. The drain hole 700 is arranged at the bottom of the battery pack 1 and is in communication with the outside. The drain channel 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 as to discharge the water from the battery pack.

[0057] In an embodiment, the drain hole 700 comprises a first drain hole 710, and the drain passage 800 comprises a first drain passage 810. The first drain hole 710 is formed in the bottom of the shell 200, and the first drain hole 710 is arranged in correspondence with the first drain passage 810 in the height direction. The first drain passage 810 guides the water on the top surface of the bracket 300 to the first drain hole 710, so as to drain out of the shell 200.

[0058] Specifically, the first drain passage 810 is arranged at least partially at one end of the bracket 300 in the length direction. Since the one end of the bracket 300 in the length direction is away from the electrode end of the battery cell 400 and the connecting piece 410, arranging the first drain passage 810 at the one end of the bracket 300 in the length direction can reduce the possibility of water contacting the battery cell 400 and the connecting piece 410. The first drain hole 710 is arranged on the shell 200 or the bracket 300, and the first drain passage 810 guides the water on the top surface of the bracket 300 to the first drain hole 710, so as to drain out of the battery pack 1. The first drain hole 710 is arranged in correspondence with the first drain passage 810 in the height direction, which reduces the flow path of the water and makes the drainage more smooth, avoiding water accumulation due to untimely drainage.

[0059] In an embodiment, the first drain hole 710 is formed in the bottom of the mounting cavity, and the first drain passage 810 is arranged on the side wall of the bracket 300 facing the display wall 240, and the first drain passage 810 is at least partially located in the mounting cavity. Further, as shown in Figure 6 and Figure 7 , the first drain hole 710 is arranged at one end of the bottom wall 230 in the length direction. Specifically, the water in the first enclosure 610 enters the mounting cavity along the first drain passage 810, and then is drained out through the first drain hole 710. Since the entire drainage path of the first drain passage 810 to the first drain 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 avoided to cause short circuit. Further, the first drain passage 810 and the first drain hole 710 are arranged by using the space of the mounting cavity, which saves the space occupied by the first drain passage 810, so that the battery pack 1 is more compact.

[0060] Referring to Figure 10 , in an embodiment, the first drain passage 810 is formed between adjacent grids 243, guiding the water in the first enclosure 610 to fall into the bottom of the mounting cavity, and then drained out of the battery pack 1 through the first drain hole 710.

[0061] In another embodiment, the first drain passage 810 and the first drain hole 710 are located at the side of the bracket 300 away from the display wall 900.

[0062] In a specific embodiment, the top surface of the support 300 is higher at an end away from the first drainage channel 810 than at an end close to the first drainage channel 810, and the top surface of the support 300 is inclinedly arranged, so that water can flow along the inclined surface from the inside of the first enclosure 610 to the first drainage channel 810.

[0063] In some embodiments, as shown in Figure 2 and Figure 3 The battery pack 1 further includes a circuit board 500 supported on the support 300, and the circuit board 500 is 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 support 300 in the height direction Z, and the orthographic projection of the top surface of the support 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.

[0064] In a specific embodiment, as shown in Figure 3 The circuit board 500 has a through hole, and water entering from the upper part of the shell 200 enters the enclosure 600 through the through hole.

[0065] 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 part of the circuit board 500 is discharged through the existing through hole of the circuit board 500 structure, without the need to develop new through holes, 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.

[0066] In a specific 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.

[0067] In some embodiments, as shown in Figure 4 and Figure 7 The top surface of the support 300 is provided with a first support 301 in the height direction, and the first support 301 is 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 support 300. The first gap 302 between the circuit board 500 and the top surface of the support 300 is in communication with the first drainage channel 810, ensuring the unobstructedness of the first drainage channel 810 and avoiding the immersion of the circuit board 500 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 support 300.

[0068] In an embodiment, the first enclosure 610 serves as the first support 301, which functions to elevate the circuit board 500 and limit the water flow range.

[0069] In another embodiment, the first support 301 is a support column distributed inside the first enclosure 610. When the circuit board 500 is installed on the bracket 300, the support column abuts against the circuit board 500, and the support column elevates the circuit board 500 to have the first gap 302 between the circuit board 500 and the top surface of the bracket 300.

[0070] Reference Figure 9 In some embodiments, the drain hole 700 includes a second drain hole 720. The second drain hole 720 is arranged on the side cover 220 and is in communication with the inside of the shell 200 and the outside. In the height direction Z, the second drain hole 720 is at least partially below the accommodation cavity 320. In a specific embodiment, the second drain hole 720 is arranged on the peripheral wall 222. The second drain hole 720 is used to drain the water entering the shell 200 out of the shell, so as to avoid water accumulation in the shell, thereby avoiding water flowing into the accommodation 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 arranged on the end wall, and the lowest point of the second drain hole is below the accommodation cavity.

[0071] 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 arranged on the side cover 220, without the need to open a hole on the bracket 300, so as to avoid water from contacting the circumferential surface of the battery cell 400.

[0072] Reference Figure 10 In some embodiments, the drain passage 800 includes a second drain passage 820, which is in communication with the second drain hole 720. The second drain hole 720 and the second drain passage 820 are arranged correspondingly. 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 shell 200 to the second drain hole 720, so as to drain the water out of the shell 200.

[0073] In a specific embodiment, the water on the second drain passage 820 guides the water overflowing the enclosure 600 on the bracket 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 arranged correspondingly in the height direction Z, so that the water flowing along the second drain passage 820 is drained more smoothly, and water accumulation is avoided.

[0074] In some embodiments, the second drain passage 820 is formed between adjacent sleeves 310. In a specific embodiment, as shown in FIG. 6, the second drain passage 820 is formed between the sleeves 310 arranged on the left side of the bracket 300 and the sleeves 310 arranged on the right side of the bracket 300. Figure 8As shown, the sleeve 310 is provided with a protrusion 340 at both ends in the width direction Y, and the protrusion 340 at least partially surrounds the corresponding connecting piece 410. The second drainage channel 820 is formed between adjacent protrusions 340.

[0075] Specifically, when too much water enters the shell 200, 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 being immersed in 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 the water is discharged through the second drainage hole 720, thereby avoiding the water from contacting the connecting piece 410 and the electrode end of the battery cell 400.

[0076] It should be noted that the second drainage hole 720 is arranged corresponding to the second drainage channel 820 within the space range that can be drained by 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.

[0077] In another embodiment, the insulating wall between adjacent sleeves is recessed in the width direction to form a second drainage channel. The second drainage channel communicates the second drainage hole with the top surface of the support, so as to timely discharge the water overflowing from the top surface of the support.

[0078] Reference Figure 8 In some embodiments, the peripheral wall 222 is arranged spaced apart from the sleeve 310 to form a flow-through space S between the peripheral wall 222 and the sleeve 310. The flow-through space S 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. The side cover 220 is fixed to 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 spaced apart from 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 spaced apart from the sleeve 310 to provide a buffer space at the bottom of the battery pack, thereby 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, and causing damage to the battery pack.

[0079] In an embodiment, the lower surface of the support 300 is concave and convex corresponding to the contour shape of the plurality of battery cells 400. The inner surface of the side of the peripheral wall 222 facing the support 300 is concave and convex corresponding to the contour of the lower surface of the support 300. The second drainage hole 720 is arranged in the concave portion of the peripheral wall 222, so that the second drainage hole 720 is located at the lowest position of the peripheral wall 222, thereby facilitating the flow of water and drainage.

[0080] Reference Figure 11 The top surface of the bracket is provided with a second support 303 in the height direction, and the second support 303 is used for supporting the signal end 411, so that the second gap 304 is formed between the signal end 411 and the top surface of the bracket.

[0081] Specifically, the connecting piece 410 is used for connecting the connecting end 412 of the plurality of battery cells 400 and the signal end 411 for transmitting the battery voltage signal to the circuit board 500. The battery cells 400, the circuit board 500, the signal end 411 of the circuit board 500, the signal end 411, the connecting end 412, and the plurality of battery cells 400 are sequentially connected. 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, so as to avoid the water in the space surrounded by the first enclosure 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, thereby preventing the water from flowing along the signal end 411 to the electrode end of the battery cell 400.

[0082] In some embodiments, as shown in Figure 5 and Figure 11 The enclosure 600 further includes a second enclosure 620 connected with the first enclosure 610. The second enclosure 620 is provided on the top surface of the bracket in the height direction and extends along the width direction. The second enclosure 620 at least partially surrounds the second gap 304. The space surrounded by the second enclosure 620 is in communication with the space surrounded by the first enclosure 610, and is used for guiding the water in the second gap 304 into the first enclosure 620 to avoid flowing to the battery cell 400.

[0083] In specific embodiments, the second enclosure 620 constitutes a semi-enclosed space. The circumferential edge of the first enclosure 610 is provided with an opening corresponding to the signal end 411. The signal end 411 extends to the lower side of the circuit board 500 through the opening and is electrically connected with the circuit board 500. The second enclosure 620 surrounds the side of the opening away from the first enclosure 610. The second support 303 is arranged at the opening. The second support 303 extends outward in the width direction at the opening. The second enclosure 620 at least partially surrounds the second support 303.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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. The sealing member 900 cooperates with the protrusion 340 to seal the connection tab 410 and the electrode end of the battery cell 400, thereby preventing water from entering and causing short circuit or corrosion.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] Reference Figures 1-11 The battery pack 1 comprises a shell 200, 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 receiving cavity 320; a plurality of battery cells 400 are arranged at intervals along the length direction X, and the battery cells 400 extend along the width direction Y, and each battery cell 400 is at least partially received in the corresponding receiving cavity 320; at least one connecting plate 410 electrically connects adjacent battery cells 410; a barrier 600 is arranged to prevent water from flowing to the end surface 311 of the sleeve 310 which is perpendicular to the width direction; the barrier 600 comprises a first barrier 610 which is arranged to protrude from the top surface of the bracket 300 along the height direction Z and extend along the length direction X. In this embodiment, the battery pack prevents water from flowing to the end of the battery cell 400 by using the barrier 600, avoids water accumulation at the battery cell 400, and reduces the risk of short circuit.

[0094] Reference Figures 1-11The battery pack 1 comprises: a shell 200 comprising an upper cover 210 and a pair of side covers 220 arranged oppositely; a support 300 comprising a plurality of sleeves 310, the sleeves 310 enclosing a receiving cavity 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 cover 220 covering the sleeves 310 at both ends of the battery cell 400 in the axial direction; and a drain hole 700 arranged on the side cover 220, the drain hole 700 being in communication with the inside of the shell 200 and the outside, and the drain hole 700 being at least partially located below the receiving cavity 320. In this embodiment, the battery pack uses the drain hole 700 to drain water entering the shell 200 out of the shell 200, thereby avoiding water accumulation in the shell 200, so as to avoid water flowing into the receiving cavity 320 to cause the battery cell 400 to rust or short circuit.

[0095] Reference Figures 1-11 The battery pack comprises: a 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 enclosing a receiving cavity 320; a plurality of battery cells 400 arranged at intervals in the length direction, each battery cell 400 being at least partially received in a corresponding receiving cavity 320, the sleeve 310 comprising an end face 311 arranged perpendicularly to the axial direction of the battery cell 400, and the side cover 220 covering the end face 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 protruding from the end face 311 in the axial direction of the battery cell 400, and at least one protruding portion 340 at least partially enclosing 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 the space enclosed by the protruding portion 340. In this embodiment, the battery pack uses the sealing member 900 in cooperation with the protruding portion 340 to seal the connecting piece 410 and the electrode end of the battery cell 400, thereby preventing water from causing the battery cell 400 or the connecting piece to short circuit or corrode.

[0096] Those skilled in the art should understand that the discussion of the above embodiments is only exemplary and is not intended to limit the scope of the present application (including the claims) 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.

[0097] 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 by, The battery pack comprises: a housing comprising an upper cover and a pair of side covers arranged oppositely; a support comprising a plurality of sleeves, the sleeves enclosing receiving cavities, the upper cover at least partially covering the support from above; a plurality of battery cells, each of the battery cells being at least partially received in a corresponding receiving cavity, the side covers covering both ends of the sleeves along the axial direction of the battery cells; at least one connecting piece, adjacent battery cells being electrically connected through the connecting piece; both ends of the sleeves are provided with protrusions along the axial direction of the battery cells, at least one of the protrusions at least partially enclosing a corresponding connecting piece; a sealing member arranged between the side cover and the protrusion; the sealing member is configured to be pressed against the protrusion when the side cover is mounted on the support, so as to at least partially seal the connecting piece in the space enclosed by the protrusion.

2. The battery pack of claim 1, wherein, Further comprising a circuit board supported on the support; the connecting piece comprises a connecting end and a signal end connected to each other, the connecting end being used for connecting the battery cell and located at the end surface of the battery cell in the axial direction, and the signal end being used for connecting the circuit board; the protrusion is provided with a notch corresponding to the signal end, the signal end extends through the notch and is bent to be connected to the circuit board.

3. The battery pack of claim 2, wherein, The sealing member is pressed against the notch, and the sealing member deforms and abuts against the signal end to seal the connecting end.

4. The battery pack of claim 2, wherein, The sleeve end corresponding to the notch is provided with a boss along the axial direction of the battery cell, the boss supports the signal end, and the height of the protrusion is greater than the height of the boss along the axial direction of the battery cell.

5. The battery pack of claim 4, wherein, The region of the signal end corresponding to the boss is flush with the end of the protrusion along the axial direction of the battery cell.

6. The battery pack of claim 2, wherein, The minimum gap between the signal end and the protrusion is not greater than 0.5 mm.

7. The battery pack of claim 2, wherein, The connecting piece is partially supported on the sleeve, the thickness of the connecting piece is W, and the protruding height of the protrusion relative to the side wall is H along the axial direction of the battery cell, wherein H≥W+0.2 mm.

8. The battery pack of claim 1, wherein, Further comprising a drainage channel formed between adjacent protrusions, the side cover being provided with a drainage hole, the drainage channel being used at least for guiding the water flow entering the housing to the drainage hole to discharge the water from the battery pack.

9. The battery pack of claim 1, wherein, The sealing member is molded on the side surface of the side cover facing the side wall.

10. The battery pack of claim 1, wherein, Further comprising a barrier protruding above the support and extending along the arrangement direction of the plurality of battery cells; the barrier is used to prevent water from flowing to the end surface of the battery cell in the axial direction.

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