Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device, and belongs to the technical field of batteries. The battery pack has a first direction, a second direction and a third direction which are intersected pairwise; the battery pack comprises a box body, a cover body and a plurality of groups of single batteries; an accommodating cavity with an opening is defined by the box body; the multiple battery packs are arranged in the containing cavity, each battery pack comprises a plurality of single batteries arranged in the third direction, each single battery comprises a top cover, and the multiple battery packs are sequentially arranged in the second direction; the cover body is connected to one end, in the first direction, of the box body and covers the opening; the cover body is provided with a plurality of concave parts which are arranged at intervals in the second direction, and the concave parts are fixedly connected with the end, in the first direction, of the top cover. According to the battery pack provided by the invention, the structural strength of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery pack and an electrical device. Background Art

[0002] As the power source of an electric vehicle, the performance of the battery pack directly affects the endurance and safety of new energy vehicles.

[0003] The existing battery pack has the problem of poor structural strength. Summary of the Utility Model

[0004] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and provide a battery pack and an electrical device.

[0005] In a first aspect, this application provides a battery pack having first, second, and third directions that intersect pairwise, including:

[0006] A box body defining a receiving cavity with an opening;

[0007] Multiple groups of battery packs arranged in the receiving cavity, each battery pack including a plurality of single cells arranged along the third direction, each single cell including a top cover, and multiple groups of battery packs arranged in sequence along the second direction;

[0008] A cover body connected to one end of the box body along the first direction and covering the opening;

[0009] The cover body is provided with a plurality of recessed portions, the plurality of recessed portions are arranged at intervals along the second direction, and the recessed portions are fixedly connected to one end of the top cover along the first direction.

[0010] In some embodiments, the recessed portion is a groove, and the groove is recessed along the first direction towards the box body.

[0011] In some embodiments, the plurality of recessed portions divide the cover body into a plurality of avoidance portions arranged along the second direction, the avoidance portions are recessed along the first direction away from the box body to form avoidance grooves, and the single cell further includes a pole column provided on the top cover, and the pole column protruding from the top cover is located in the avoidance groove.

[0012] In some embodiments, the battery pack further includes a bus bar;

[0013] Along the third direction, two adjacent pole columns are connected by one bus bar, and the bus bar is located in the avoidance groove.

[0014] In some embodiments, a heat dissipation plate is provided between the bus bar and the cover body, and the heat dissipation plate is arranged in the avoidance groove;

[0015] Along the first direction, one side of the heat dissipation plate facing the cover body is connected to the cover body, and one side of the heat dissipation plate facing the single battery is connected to the bus bar.

[0016] In some embodiments, the heat dissipation plate defines at least one diversion channel, and the diversion channel penetrates the heat dissipation plate along the third direction.

[0017] In some embodiments, the pole includes a first pole and a second pole that are spaced apart along the second direction X on the top cover;

[0018] The first pole and the second pole are respectively located on two opposite sides of the recess along the second direction X.

[0019] In some embodiments, the bus bar includes a first bus bar and a second bus bar;

[0020] Along the third direction, two adjacent first poles are connected by one first bus bar, and two adjacent second poles are connected by one second bus bar;

[0021] The first bus bar and the second bus bar are arranged in a staggered manner in the avoidance groove.

[0022] In some embodiments, an explosion-proof valve is provided on a side of the single battery facing away from the cover body, and there is a gap between the explosion-proof valve and the inner wall of the box body.

[0023] In a second aspect, the present application provides an electrical device including the battery pack described above.

[0024] The embodiments of the present application have the following advantages: By providing a plurality of recesses arranged at intervals along the second direction on the cover body, and the recess is fixedly connected to the top cover along the first direction, a limiting effect can be formed on the top cover to prevent the single battery from moving relative to the cover body, and the structural strength of the battery pack can be improved.

[0025] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0027] Figure 1Explosion diagram of a battery pack from a perspective provided by some embodiments of the present application;

[0028] Figure 2 Explosion diagram of a battery pack from another perspective provided by some embodiments of the present application;

[0029] Figure 3 Schematic structural diagram of a battery pack from a perspective provided by some embodiments of the present application;

[0030] Figure 4 Shows Figure 3 Cross-sectional view of part A-A in

[0031] Figure 5 Shows Figure 4 Enlarged view of part B in

[0032] Figure 6 Schematic structural diagram of a battery pack from another perspective provided by some embodiments of the present application;

[0033] Figure 7 Schematic structural diagram of a single battery cell from a perspective in a battery pack provided by some embodiments of the present application.

[0034] Explanation of main element symbols:

[0035] 100 - Box body; 110 - Accommodation cavity; 200 - Cover body; 210 - Concave part; 220 - Avoidance part; 221 - Avoidance groove; 300 - Battery pack; 310 - Single battery cell; 311 - Top cover; 312 - Terminal post; 312a - First terminal post; 312b - Second terminal post; 313 - Explosion-proof valve; 400 - Bus bar; 410 - First bus bar; 420 - Second bus bar; 500 - Heat dissipation plate; 510 - Flow guide channel; 600 - Connection plate; 700 - Adhesive layer.

[0036] Z - First direction; X - Second direction; Y - Third direction. Detailed implementation manners

[0037] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0038] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise clearly specifically defined.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the template herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] As Figures 1 to 3 shown, some embodiments of this application provide a battery pack, and the battery pack has a first direction Z, a second direction X and a third direction Y that intersect pairwise.

[0043] The battery pack includes a box body 100, a cover body 200 and multiple groups of single cells 310.

[0044] It should be noted that the shape of the box body 100 can be any one of a sphere, a polyhedron, a cone, a pyramid, a shaped body or a combination of two or more of them.

[0045] In this application, taking the box body 100 as a cuboid as an example, the following specific description is given.

[0046] Among them, the box body 100 defines a receiving cavity 110 with an opening. Specifically, the opening is provided on one side of the box body 100 along the first direction Z, and the opening communicates with the receiving cavity 110.

[0047] Multiple battery packs 300 are arranged in the receiving cavity 110, and the number of battery packs 300 arranged in the receiving cavity 110 can be specifically set according to the actual situation.

[0048] In this embodiment, the battery pack 300 includes a plurality of single cells 310 arranged along the third direction Y. The single cell 310 includes a top cover 311, and the top cover 311 is arranged close to the cover body 200, that is, close to the opening of the box body 100.

[0049] In addition, multiple battery packs 300 are arranged in sequence along the second direction X. Among them, there is a gap or they are in contact with each other between two adjacent battery packs 300, which can be specifically set according to the actual situation.

[0050] It can be understood that since in this embodiment, the box body 100 is of a cuboid structure and the receiving cavity 110 is of a cuboid structure, therefore, by arranging multiple single cells 310 in a matrix in the receiving cavity 110, the compactness of the arrangement of multiple single cells 310 in the receiving cavity 110 is improved.

[0051] The cover body 200 is connected to one end of the box body 100 along the first direction Z and seals the opening to form a sealed receiving cavity 110. It can be understood that the cover body 200 can provide a limiting effect on the multiple single cells 310 arranged in the receiving cavity 110, thereby improving the stability of the single cells 310 in the first direction.

[0052] The connection method between the cover body 200 and the box body 100 includes at least any one of bonding, clamping, bolt connection or welding.

[0053] In this embodiment, the cover body 200 and the box body 100 are connected by bolts. While ensuring the stability of the connection between the cover body 200 and the box body 100, it is convenient for the installation or disassembly between the cover body 200 and the box body 100.

[0054] In addition, the cover body 200 is provided with a plurality of recessed portions 210, and the number of recessed portions 210 can be two or more than two arbitrary values, which can be specifically set according to the actual situation.

[0055] In this embodiment, the number of recessed portions 210 is equal to the number of battery packs 300, so as to ensure that the top cover 311 of the single cells 310 in each battery pack 300 can correspondingly contact the side of the recessed portion 210 facing the box body 100 along the first direction Z, avoiding the occurrence of a gap between the cover body 200 and the top cover 311, and improving the structural strength of the battery pack.

[0056] Specifically, a plurality of recessed portions 210 are arranged at intervals along the second direction X. One end of the recessed portion 210 and the top cover 311 are fixedly connected along the first direction Z, so as to provide a limiting effect on the top cover 311 through the recessed portion 210. Compared with the method in which the single battery 310 is not connected to the cover body 200 in the box body 100, the fixed connection between the recessed portion 210 and the top cover 311 can improve the structural strength of the battery pack.

[0057] It should be noted that, in this embodiment, a plurality of recessed portions 210 are arranged at equal intervals along the second direction X, so that the single batteries 310 can be arranged at equal intervals along the second direction, and the compactness of the arrangement of multiple groups of single batteries 310 in the accommodation cavity 110 is improved.

[0058] The cover body 200 provided in this embodiment can be a vehicle body floor or an independent battery cover plate. Among them, the material of the cover body 200 can be metal, non-metal or composite material.

[0059] It should be noted that when the cover body 200 is used as the vehicle body floor, that is, the battery-body integrated CTB (Cell To Body), that is to say, the battery pack is integrated into the vehicle body to form a whole, further improving the structural strength of the battery pack. And in this structural mode, the battery pack is not only an energy body, but also participates in the force transmission and force bearing of the whole vehicle as a structural body, which can reduce the intrusion amount of the whole vehicle side column collision by 45%.

[0060] When the cover body 200 is used as an independent battery cover plate, at this time, the battery pack can be directly integrated into the vehicle floor, that is, CTC (Cell to Chassis), which further deepens the integration of the battery pack with the electric vehicle power system and the chassis, reduces the number of parts, saves space, improves the structural efficiency, greatly reduces the vehicle weight, and increases the battery pack endurance mileage.

[0061] Such as Figure 1 、 Figure 2 and Figure 6 As shown, in some embodiments of the present application, the recessed portion 210 is a groove, and the groove is recessed in the direction approaching the box body 100 along the first direction Z.

[0062] Among them, one side of the recessed portion 210 facing the top cover 311 is fixedly connected to the side of the top cover 311 facing the opening. Through the setting of the recessed portion 210, not only can a limiting effect be formed on the single battery 310, but also the structural strength of the battery pack can be improved.

[0063] In this embodiment, an adhesive layer 700 is provided on the side of the recess 210 facing the battery pack 300. The adhesive layer 700 is disposed between the battery pack 300 and the cover 200 to bond the recess 210 of the cover 200 to the top cover 311 of the single battery 310 through the adhesive layer 700, thereby connecting the single battery 310 to the cover 200 and enhancing the connection stability between the cover 200 and the single battery 310, and thus enhancing the structural strength of the battery pack. Among them, the adhesive layer 700 is a glue layer.

[0064] It should be noted that, in the projection on the plane where the cover 200 is located along the third direction, the adhesive layer 700 at least partially overlaps with each single battery 310 in a group of battery packs 300 to connect each single battery 310 in the battery pack 300 through the adhesive layer 700, and the adhesive layer 700 is simultaneously connected to the cover 200 to provide a limiting and fixing effect on each single battery 310 in the battery pack 300 through the cover 200, avoiding the situation that the single battery 310 shakes or shifts in the accommodation cavity 110, so as to ensure the stability of each single battery 310 in the accommodation cavity 110 of the battery pack 300.

[0065] An adhesive layer is added here (see the attached drawing annotation), and it is supplemented in the specification: the connection method between the upper cover and the box body: connected by bolts.

[0066] Specifically, a part of the cover 200 is recessed in the direction close to the box body 100 along the first direction to form a groove on the side of the cover 200 facing away from the box body 100, and the shape of the groove is square.

[0067] It should be noted that the extending direction of the recess 210 is parallel to the third direction Y.

[0068] By recessing the cover 200 in the direction close to the box body 100 along the first direction, the side of the recess 210 facing the cover 200 can be fixedly connected to the cover 200, which can enhance the structural strength of the battery pack.

[0069] As Figure 2 shown, in some embodiments of the present application, a plurality of recesses 210 divide the cover 200 into a plurality of avoidance portions 220 arranged along the second direction X. It can be understood that the avoidance portions 220 and the recesses 210 are alternately arranged along the second direction.

[0070] It should be noted that since the plurality of recesses 210 are arranged at equal intervals along the second direction, the plurality of avoidance portions 220 are arranged at equal intervals along the second direction.

[0071] Among them, the avoidance portion 220 is recessed in the direction away from the box body 100 along the first direction Z to form an avoidance groove 221, that is, the recess 210 and the avoidance groove 221 are alternately arranged along the second direction.

[0072] In addition, the single cell 310 further includes a pole column 312 disposed on the top cover 311. The pole column 312 penetrates through the top cover 311, and the pole column 312 protruding from the top cover 311 is located in the avoidance groove 221, so as to provide a clearance space for the pole column 312 of the single cell 310 through the avoidance groove 221.

[0073] It should be noted that the depth of the avoidance groove 221 in the first direction Z is greater than the length of the pole column 312 protruding from the top cover 311 in the first direction Z, so that when the top cover 311 is fixedly connected to the recessed portion 210, the pole column 312 protruding from the top cover 311 can be completely received in the avoidance groove 221, so as to further improve the compactness of the battery pack in the first direction Z.

[0074] Since the avoidance groove 221 is adjacent to the recessed portion 210, the recessed portion 210 can limit and block the pole column 312 in the first direction and the second direction, avoiding the movement of the single cell 310 in the second direction, thereby improving the stability of the single cell 310 in the second direction.

[0075] As Figure 1 、 Figure 2 and Figure 7 shown, in this embodiment, the pole column 312 includes a first pole column 312a and a second pole column 312b. Both the first pole column 312a and the second pole column 312b penetrate through the top cover 311. The first pole column 312a and the second pole column 312b are arranged at intervals along the second direction X on the top cover 311, and the first pole column 312a and the second pole column 312b are respectively located on two opposite sides of the recessed portion 210 along the second direction X, and the first pole column 312a and the second pole column 312b are respectively adjacent to the recessed portion 210.

[0076] Specifically, along the second direction X, the length of the recessed portion 210 is less than or equal to the distance between the first pole column 312a and the second pole column 312b in a single cell 310, so that the recessed portion 210 can be completely fixedly connected to the top cover 311 of the single cell 310. This can not only increase the contact area between the recessed portion 210 and the top cover 311, but also improve the stability of the connection between the recessed portion 210 and the top cover 311 through the adhesive layer 700.

[0077] As Figure 1 and Figure 5 shown, in some embodiments of the present application, the battery pack further includes a bus bar 400.

[0078] Along the third direction Y, two adjacent pole columns 312 are connected by a bus bar 400. The bus bar 400 is located in the avoidance groove 221 to electrically connect two adjacent single cells 310 through the bus bar 400.

[0079] It should be noted that there is a gap between two adjacent busbars 400 to serially connect multiple single cells 310 in sequence through the busbars 400.

[0080] As Figure 4 and Figure 5 shown, in this embodiment, the busbar 400 includes a first busbar 410 and a second busbar 420. Along the third direction, two adjacent first pole columns 312a are connected by a first busbar 410, and two adjacent second pole columns 312b are connected by a second busbar 420.

[0081] Among them, there is a gap between two adjacent first busbars 410, and there is a gap between two adjacent first busbars 410 and the second busbar 420.

[0082] Since multiple single cells 310 are arranged in sequence along the third direction in the accommodation cavity 110, therefore, both the first busbar 410 and the second busbar 420 are multiple. The multiple first busbars 410 are arranged at equal intervals along the third direction, and the multiple second busbars are arranged at equal intervals along the third direction.

[0083] In addition, it should be noted that the first busbar 410 and the second busbar 420 are arranged in a staggered manner in the avoidance groove 221, so that multiple single cells 310 arranged along the third direction are serially connected in sequence through the first busbar 410 and the second busbar 420 to form a battery pack.

[0084] As Figure 2 、 Figure 4 and Figure 5 shown, in some embodiments of the present application, a heat dissipation plate 500 is provided between the busbar 400 and the cover 200. One side of the heat dissipation plate 500 facing the cover 200 is connected to the cover 200, and one side of the heat dissipation plate 500 facing the single cell 310 is connected to the busbar 400, so that the heat generated by the busbar 400 can be conducted to the heat dissipation plate 500, and the heat can be dissipated through the heat dissipation plate 500, so as to adjust the temperature of the busbar 400 through the heat dissipation plate 500 and ensure the temperature stability of the busbar 400.

[0085] Since the busbar 400 is connected to the pole column 312 of the single cell 310, so that the heat generated by the single cell 310 during operation can be conducted to the busbar 400 through the pole column 312, and the heat of the busbar 400 is exported through the heat dissipation plate 500, thereby adjusting the temperature of the single cell 310 through the heat dissipation plate 500 to ensure the temperature stability of the single cell 310.

[0086] Among them, the connection method between the heat dissipation plate 500 and the cover 200 includes any one of bonding, clamping, bolt connection, welding or integral molding, which can be specifically set according to the actual situation.

[0087] In this embodiment, the heat dissipation plate 500 is integrally connected to the cover 200, which can not only improve the connection stability between the heat dissipation plate 500 and the cover 200, but also improve the connection compactness between the heat dissipation plate 500 and the cover 200.

[0088] In addition, it should be noted that along the third direction Y, a plurality of busbars 400 are connected to the heat dissipation plate 500 by bonding to improve the connection stability between the plurality of busbars 400 and the heat dissipation plate 500. At the same time, the heat dissipation plate 500 can also limit and fix the plurality of busbars 400 to ensure the stability between two adjacent busbars 400.

[0089] Specifically, one side of the heat dissipation plate 500 facing the cover 200 is attached to the cover 200, and one side of the heat dissipation plate 500 facing the single battery 310 is attached to the busbar 400 to improve the compactness of the battery pack in the first direction Z.

[0090] Specifically, two adjacent first poles 312a are connected by the first busbar 410, and two adjacent second poles 312b are connected by the second busbar 420, so that a plurality of single batteries 310 in a battery pack 300 are connected in series along the third direction Y through the first busbar 410 and the second busbar 420.

[0091] As Figure 5 shown, in some embodiments of the present application, the heat dissipation plate 500 defines at least one flow guiding channel 510, and the flow guiding channel 510 penetrates the heat dissipation plate 500 along the third direction Y.

[0092] Wherein, the length direction of the heat dissipation plate 500 is parallel to the arrangement direction of the busbars 400 in the avoidance groove 221, and the extending direction of the flow guiding channel 510 is parallel to the length direction of the heat dissipation plate 500.

[0093] It should be noted that by connecting the heat dissipation plate 500 to the busbar 400, the temperature of the busbar 400 is adjusted through the heat dissipation plate 500, so as to adjust the temperature of the single battery 310.

[0094] In some embodiments, the heat dissipation plate 500 has a plurality of flow guiding channels 510 arranged at intervals, and the axes of the plurality of flow guiding channels 510 are parallel to each other.

[0095] By providing a plurality of flow guiding channels 510, the flow guiding cross-sectional area of gas or liquid in the heat dissipation plate 500 is increased to improve the heat dissipation efficiency of the heat dissipation plate 500.

[0096] In this embodiment, the heat dissipation plate 500 extends along the third direction Y, and at least one heat dissipation plate 500 connects a plurality of first busbars 410 arranged along the third direction Y, so as to connect the plurality of first busbars 410 in the avoidance groove 221 through the heat dissipation plate 500, thereby enhancing the stability of the plurality of first busbars 410 in the avoidance groove 221.

[0097] In addition, at least one heat dissipation plate 500 connects a plurality of second busbars 420 arranged along the third direction Y, so as to connect the plurality of second busbars 420 in the avoidance groove 221 through the heat dissipation plate 500, thereby enhancing the stability of the plurality of second busbars 420 in the avoidance groove 221.

[0098] As Figure 1 shown, in some embodiments of the present application, an explosion-proof valve 313 is provided on the side of the single battery 310 facing away from the cover 200. There is a gap between the explosion-proof valve 313 and the side of the box body 100 facing the cover 200. When a thermal runaway occurs in the single battery 310 in the battery pack, the explosion-proof valve 313 of the single battery 310 opens and discharges the gas in the single battery 310 into the accommodation cavity 110. The explosion-proof valve 313 is located on the opposite side of the pole 312, which can achieve thermoelectric separation and improve the safety performance of the battery pack.

[0099] As Figure 1 、 Figure 2 and Figure 4 shown, in some embodiments of the present application, along the second direction X, a plurality of spaced connecting plates 600 are provided in the accommodation cavity 110. Two adjacent battery packs 300 are connected by one connecting plate 600 to enhance the connection stability between two adjacent battery packs 300.

[0100] It should be noted that in this embodiment, the number of the connecting plates 600 is equal to the number of the avoidance grooves 221. Among them, the connecting plates 600 are parallel to the first direction Z and the third direction Y, and the connecting plates 600 are perpendicular to the second direction X.

[0101] Specifically, along the second direction X, connecting plates 600 are respectively provided on two opposite sides of the battery pack 300 to connect two adjacent battery packs 300 through the connecting plates 600.

[0102] In this embodiment, the connecting plate 600 can connect a plurality of single batteries 310 arranged along the third direction Y to enhance the stability of the plurality of single batteries 310 in the third direction Y, and prevent the single batteries 310 from shaking in the accommodation cavity 110 along the first direction Z, the second direction X or the third direction Y, thereby enhancing the stability of the single batteries 310 in the accommodation cavity 110.

[0103] In some embodiments of the present application, the connection plate 600 is bonded to the battery pack 300 to improve the stability of the battery pack 300 in the accommodation cavity 110 and enhance the stability of the connection between two adjacent single cells 310.

[0104] Along the first direction Z, the height of the connection plate 600 is equal to the height of the single cell 310 to increase the contact area between the single cell 310 and the connection plate 600 along the second direction, thereby further enhancing the stability of the connection between the single cell 310 and the connection plate 600. Additionally, along the third direction Y, the length of the connection plate 600 is equal to the length of the battery pack 300 so that the connection plate 600 can be connected to each single cell 310 in the battery pack 300, thus ensuring the stability of the connection between two adjacent single cells 310 in the battery pack 300.

[0105] The present application also provides an electrical device including the battery pack described in any one of the above embodiments.

[0106] It should be noted that in this embodiment, the electrical device includes the structure of the battery pack described in any one of the above embodiments and has the beneficial effects of the battery pack described in any one of the above embodiments, which will not be elaborated here one by one.

[0107] Among them, the electrical device may include, but is not limited to, a backup power supply, a motor, an electric vehicle, an electric motorcycle, an assisted bicycle, a bicycle, an electric tool, a large household battery, etc.

[0108] In all the examples shown and described here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0109] It should be noted that: Similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0110] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but should not be construed as a limitation on the scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application.

Claims

1. A battery pack having a first direction (Z), a second direction (X) and a third direction (Y) intersecting each other, characterized in that: include: A box body (100) defines a receiving cavity (110) having an opening; A plurality of battery packs (300) are arranged in the accommodating cavity (110), the battery pack (300) comprising a plurality of single cells (310) arranged along the third direction (Y), the single cells (310) comprising a top cover (311), and the plurality of battery packs (300) are arranged in sequence along the second direction (X); A cover body (200) connected to one end of the box body (100) along the first direction (Z) and covering the opening; The cover body (200) is provided with a plurality of recessed portions (210), the plurality of recessed portions (210) being arranged at intervals along the second direction (X), and the recessed portions (210) being fixedly connected to one end of the top cover (311) along the first direction (Z).

2. The battery pack according to claim 1, characterized in that: The recessed portion (210) is a groove, and the groove is recessed along the first direction (Z) toward the box body (100).

3. The battery pack according to claim 1, characterized in that: The plurality of recessed portions (210) divide the cover body (200) into a plurality of escape portions (220) arranged along the second direction (X); the escape portions (220) are recessed along the first direction (Z) in a direction away from the box body (100) to form an escape groove (221); the single battery (310) further comprises a pole (312) disposed on the top cover (311); the pole (312) protruding from the top cover (311) is located in the escape groove (221).

4. The battery pack according to claim 3, characterized in that: The battery pack also includes a bus bar (400); Along the third direction (Y), two adjacent poles (312) are connected via a bus bar (400), and the bus bar (400) is located in the avoidance groove (221).

5. The battery pack according to claim 4, characterized in that: A heat dissipation plate (500) is provided between the busbar (400) and the cover body (200), and the heat dissipation plate (500) is arranged in the avoidance groove (221); Along the first direction (Z), the heat dissipation plate (500) is connected to the cover body (200) on one side thereof facing the cover body (200), and the heat dissipation plate (500) is connected to the bus bar (400) on one side thereof facing the single battery (310).

6. The battery pack according to claim 5, characterized in that: The heat dissipation plate (500) defines at least one guide channel (510), and the guide channel (510) penetrates the heat dissipation plate (500) along the third direction (Y).

7. The battery pack according to claim 4, characterized in that: The pole (312) comprises a first pole (312a) and a second pole (312b) which are arranged on the top cover (311) at intervals along the second direction (X); The first pole (312a) and the second pole (312b) are respectively located on two opposite sides of the recessed portion (210) along the second direction (X).

8. The battery pack according to claim 7, characterized in that: The busbar (400) comprises a first busbar (410) and a second busbar (420); Along the third direction (Y), two adjacent first poles (312a) are connected via a first busbar (410), and two adjacent second poles (312b) are connected via a second busbar (420); The first busbar (410) and the second busbar (420) are staggeredly arranged in the avoidance groove (221).

9. The battery pack according to claim 1, characterized in that: An explosion-proof valve (313) is provided on the side of the single battery (310) facing away from the cover body (200), and a gap is formed between the explosion-proof valve (313) and the inner wall of the box body (100).

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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