Battery pack and electric device

Abstract

According to the battery pack, at least one first protruding part is arranged on each of two side walls, oppositely arranged in the first direction, of a box body, and side plates are arranged on two side faces, oppositely arranged in the first direction, of a battery pack; at least two first protruding parts are arranged on the face, away from the battery pack, of the side plate, the two first protruding parts are arranged at intervals in the third direction and define a limiting cavity, the first protruding parts can be inserted into the limiting cavity, and the two first protruding parts are matched with the first protruding parts to limit movement of the battery pack in the third direction. Therefore, the situation that electric connection inside the battery pack is loosened due to the fact that the moving distance of the battery pack in the third direction is too large when the box body is vibrated is avoided, and use safety of the battery pack is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery pack and an electric device. Background Art

[0002] The structural design of existing battery packs needs to take into account the displacement of the battery pack in the box caused by vibration and impact during the actual operation of the electrical device, especially the displacement along the height direction of the box, which will cause the connection between the battery pack and the circuit control components to loosen, affecting the safe use of the battery pack. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electric device to solve the problem that the box of the current battery pack is displaced due to vibration of the electric device, which affects the safety of use.

[0004] A first aspect of an embodiment of the present application provides a battery pack, comprising: a box body, the box body having a first direction and a third direction intersecting each other, the box body comprising two side walls arranged opposite to each other along the first direction, a accommodating cavity being arranged in the box body, and at least one first protrusion is respectively protruded from one side of the two side walls facing the accommodating cavity; a battery pack is arranged in the accommodating cavity, the battery pack having two side surfaces arranged opposite to each other along the first direction; a side plate is arranged in the accommodating cavity, one of the side plates is respectively fixedly provided on the two side surfaces, and at least two first protrusions are protruded from one side of the side plate facing away from the battery pack in the first direction, and the at least two first protrusions are arranged at intervals along the third direction and define a limiting cavity; wherein the first protrusion is inserted into the limiting cavity to limit the movement of the battery pack in the third direction.

[0005] Optionally, along the first direction, ends of the two first protrusions away from the battery pack are bent relative to each other along a third direction toward each other.

[0006] Optionally, the box body includes a first surface and a second surface arranged opposite to each other along the third direction, and an opening is provided on the first surface; a second protrusion is protruding from a side of the side wall facing the accommodating cavity, and the second protrusion is arranged at an end of the side wall close to the opening in the third direction; a second protrusion is protruding from a side of the side plate in the first direction away from the battery pack, and the second protrusion abuts against the second protrusion.

[0007] Optionally, a third protrusion is protruding from a side of the side panel facing away from the battery pack in the first direction; along the third direction, the third protrusion is arranged between the second protrusion and the adjacent first protrusion; the third protrusion is bent toward the opening at one end away from the battery pack in the first direction; the third protrusion can abut against the second protrusion to limit the movement of the battery pack in the third direction.

[0008] Optionally, the box body also has a second direction, and the first direction, the second direction and the third direction intersect with each other, and the battery pack also includes a support beam, which is arranged in the accommodating cavity, and the support beam extends along the second direction and is inscribed in the box body, and the support beam divides the accommodating cavity into compartments arranged at intervals along the first direction for accommodating the battery pack; the support beam has two side edges arranged opposite to each other along the first direction, and at least one first protrusion is respectively protruded from one side of the two side edges facing the battery pack, and the first protrusion is inserted into the limiting cavity adjacent to the first direction to limit the movement of the battery pack in the third direction.

[0009] Optionally, a second protrusion is protruding from a surface of the side facing the battery pack, and the second protrusion is arranged at an end of the side close to the opening in the third direction; the second protrusion can abut against the second protrusion.

[0010] Optionally, a third protrusion on the side panel adjacent to the side edge can abut against the second protrusion.

[0011] Optionally, the box body includes a first surface and a second surface arranged opposite to each other along the third direction, and the side panel includes a first end surface and a second end surface arranged opposite to each other along the third direction; along the third direction, a first gap exists between the second end surface and the second surface.

[0012] Optionally, the side plate includes a first substrate and a second substrate stacked along the first direction, the first substrate abuts against the side of the battery pack, and the first protrusion is arranged on a side of the second substrate facing away from the first substrate in the first direction; the stiffness of the first substrate is greater than the stiffness of the second substrate; and the elastic modulus of the second substrate is greater than the elastic modulus of the first substrate.

[0013] Optionally, along the first direction, a second gap exists between an end surface of the first protrusion facing one end of the battery pack and an end surface of the side plate facing away from the battery pack.

[0014] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0015] In summary, the embodiments of the present application provide a battery pack and an electrical device having the battery pack, wherein the battery pack is provided with at least one first protrusion respectively on two side walls of a box body that are relatively arranged along a first direction, and side panels are respectively provided on two side surfaces of the battery pack that are relatively arranged along the first direction, and at least two first protrusions are provided on a side of the side panel that is away from the battery pack, and the two first protrusions are arranged at intervals along a third direction and define a limiting cavity, and the first protrusion can be inserted into the limiting cavity, and the cooperation between the two first protrusions and the first protrusion can form a restriction on the movement of the battery pack in the third direction (the height direction of the box body), thereby avoiding the loosening of the internal electrical connection of the battery pack due to the excessive movement distance of the battery pack in the third direction when the box body is vibrated, thereby ensuring the safe use of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0018] Figure 2 yes Figure 1 AA section view;

[0019] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at B;

[0020] Figure 4 yes Figure 2 A schematic diagram of the enlarged structure at C;

[0021] Figure 5 is a schematic structural diagram of a side plate in a battery pack provided in an embodiment of the present application;

[0022] Figure 6 yes Figure 5 Side view of

[0023] Figure 7 is a schematic diagram of the structure of a box in a battery pack provided in an embodiment of the present application;

[0024] Figure 8 It is a schematic diagram of the combined structure of the battery pack and the side plate in the battery pack provided in the embodiment of the present application;

[0025] Fig. 9 is a schematic structural diagram of the side wall of the box body in the battery pack provided in the embodiment of the present application;

[0026] Fig.10 is a schematic diagram of the structure of a support beam in a battery pack provided in an embodiment of the present application;

[0027] Fig.11 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0028] Description of main reference numerals:

[0029] 1. Battery pack;

[0030] 10. box body, 101. accommodating chamber, 102. compartment, 11. side wall, 111. first side wall, 112. second side wall, 121. first protruding portion, 122. second protruding portion, 13. first surface, 131. opening, 14. second surface, 15. end wall, 151. first end wall, 152. second end wall;

[0031] 20. battery pack, 201. battery cell, 2011. first surface, 2012. second surface, 2013. third surface, 2014. fourth surface, 2015. fifth surface, 2016. sixth surface, 21. side surface, 211. first side surface, 212. second side surface, 22. first wall, 23. second wall;

[0032] 30, side plate, 301, first substrate, 302, second substrate, 303, groove, 31, first protrusion, 311, limiting cavity, 32, second protrusion, 33, third protrusion, 34, first end surface, 35, second end surface, 36, first gap, 37, second gap;

[0033] 40. support beam, 41. side, 411. first side, 412. second side, 42. first protruding portion, 43. second protruding portion;

[0034] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. 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 indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0040] This embodiment provides an electrical device, including a battery pack.

[0041] In some embodiments, a battery pack 1 is provided, referring to Figure 1 to Figure 3 as well as Figures 5 to 9 The battery pack 1 includes: a box body 10, a battery group 20 and a side plate 30.

[0042] In some embodiments, reference Figure 1 to Figure 3 as well as Figure 7 and Fig. 9 The box 10 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 to Figure 3 as well as Figure 7 In the embodiment shown, the first direction X, the second direction Y and the third direction Z are orthogonal to each other. Figure 1 and Figure 7 The box body 10 is provided with a receiving cavity 101. The box body 10 includes two side walls 11 arranged opposite to each other along a first direction X. The two side walls 11 include a first side wall 111 and a second side wall 112. The box body 10 also includes two end walls 15 arranged opposite to each other along a second direction Y. The two end walls 15 include a first end wall 151 and a second end wall 152. The box body 10 also includes a first surface 13 and a second surface 14 arranged opposite to each other along a third direction Z. The first side wall 111, the first end wall 151, the second side wall 112 and the second end wall 152 are sequentially connected and enclosed to form a shell structure with two open ends along the third direction Z. The first surface 13 and the second surface 14 are respectively covered with the two open ends of the shell structure. An opening 131 is provided on the first surface 13. Figure 1 to Figure 3 as well as Fig. 9 The first side wall 111 and the second side wall 112 are respectively provided with at least one first protrusion 121 on one side facing the accommodating cavity 101 in the first direction X. Fig. 9 In the illustrated embodiment, two first protrusions 121 are respectively disposed on opposite surfaces of the first side wall 111 and the second side wall 112 . The first protrusions 121 extend along the second direction Y. The two first protrusions 121 are arranged along the third direction Z at intervals.

[0043] In some embodiments, reference Figure 1 to Figure 4 as well as Figure 8 The battery pack 20 is disposed in the accommodating cavity 101 of the box body 10. Figure 1 to Figure 4 In the illustrated embodiment, the battery pack 20 has two side surfaces 21 relatively arranged along a first direction X, the two side surfaces 21 include a first side surface 211 and a second side surface 212, the first side surface 211 is adjacent to the first side wall 111 in the first direction X, and the second side surface 212 is adjacent to the second side wall 112 in the first direction X, the battery pack 20 also includes a first wall 22 and a second wall 23 relatively arranged along a third direction Z, the first wall 22 is adjacent to the opening 131 of the box body 10 in the third direction Z.

[0044] In some embodiments, reference Fig.11The battery cell 201 includes a first surface 2011 and a second surface 2012 arranged opposite to each other along a first direction X, a third surface 2013 and a fourth surface 2014 arranged opposite to each other along a second direction Y, and a fifth surface 2015 and a sixth surface 2016 arranged opposite to each other along a third direction Z. The first surface 2011, the third surface 2013, the second surface 2012 and the fourth surface 2014 are sequentially connected and enclosed to form a shell structure with open ends along the third direction Z. The fifth surface 2015 and the sixth surface 2016 are respectively covered on the two open ends of the shell structure, wherein the first surface 2011 and the second surface 2012 are the two surfaces with the largest surface areas.

[0045] In some embodiments, the battery pack 20 includes a plurality of battery cells 201, as shown in FIG. Figure 1 and Figure 8 In the illustrated embodiment, six battery cells 201 are arranged along the first direction X to form a column of battery cells, and multiple columns of battery cells are arranged along the second direction Y to form a battery pack 20. The first side surface 211 of the battery pack 20 is formed by the first surfaces 2011 of the eight battery cells 201 close to one end of the first side wall 111 in the first direction X, and the second side surface 212 is formed by the second surfaces 2012 of the eight battery cells 201 close to one end of the second side wall 112 in the first direction X. The first wall 22 of the battery pack 20 is formed by the fifth surfaces 2015 of all the battery cells 201 constituting the battery pack 20, and the second wall 23 is formed by the sixth surfaces 2016 of all the battery cells 201 constituting the battery pack 20. In other embodiments, if the first surface 2011 of the battery pack 20 is provided with other structures near the outside of the first side wall 111, such as a partition, the first side surface 211 of the battery pack 20 is the outermost side surface of the partition close to the first side wall 111, and the second side surface 212 of the battery pack 20 is similar, which will not be described again.

[0046] In some embodiments, reference Figure 1 to Figure 3 , Figure 5-6 as well as Figure 8 The side plate 30 is arranged in the accommodating cavity 101 of the box body 10. Specifically, a side plate 30 is arranged on the first side 211 of the battery pack 20, and a side plate 30 is arranged on the second side 212. Specifically, the side plate 30 is fixedly arranged on the first side 211 and the second side 212. The side plate 30 is protruding from a side of the side plate 30 away from the battery pack 20 in the first direction X and is provided with at least two first protrusions 31. The at least two first protrusions 31 are arranged at intervals along the third direction Z and define a limiting cavity 311. Specifically, Figure 3 to Figure 6In the illustrated embodiment, there are four first protrusions 31 on the side plate 30, which are arranged in groups of two and spaced apart along the third direction Z. One first protrusion 121 corresponds in number to one group of first protrusions 31. The first protrusions 121 are inserted into the limiting cavity 311. The two first protrusions 31 cooperate with the first protrusions 121 to form a restriction on the movement of the battery pack 20 in the third direction Z. Specifically, the two first protrusions 31 on the side plate 30 disposed on the first side surface 211 of the battery pack 20 cooperate with the first protrusions 121 on the first side wall 111, and the two first protrusions 31 on the side plate 30 disposed on the second side surface 212 cooperate with the first protrusions 121 on the second side wall 112 to form a restriction on the movement of the side plate 30 in the third direction Z. At the same time, since the side plate 30 is fixedly disposed on the side surface 21 of the battery pack 20, the movement of the battery pack 20 as a whole in the third direction Z is restricted.

[0047] As a power supply device in an electrical device, the battery pack needs to be designed to take into account that the battery pack box may shake due to vibration and external impact during the actual operation and use of the electrical device, which may cause the battery pack inside the battery pack to move, especially the displacement of the battery pack along the height direction of the box, which may cause the connection between the battery packs and between the battery packs and the circuit control components to loosen, affecting the service life of the battery pack. In this regard, when designing the structure of the existing battery pack, the rigidity of the box is increased by increasing the structural strength of the box, such as adding reinforcing ribs or adding support beams in the box to strengthen the box. Adding reinforcing ribs will increase the manufacturing cost of the battery pack, and adding beams in the box will reduce the space utilization rate in the box, thereby affecting the energy density of the entire battery pack.

[0048] The battery pack 1 provided in the embodiment of the present application is provided with first protrusions 121 on the opposite surfaces of the first side wall 111 and the second side wall 112 of the box body 10, and side panels 30 are respectively provided on the first side 211 and the second side 212 of the battery pack 20, and the side panels 30 are fixedly provided on the first side 211 and the second side 212, and at least two first protrusions 31 are provided on the side of the side panel 30 away from the battery pack 20, and the two first protrusions 31 are arranged at intervals along the third direction Z and define a limiting cavity 311, and the first protrusion 121 can be inserted into the limiting cavity 311, and the two first protrusions 31 cooperate with the first protrusion 121, so that When the battery pack 1 is shaken or impacted by the outside, the movement of the side plate 30 in the third direction Z can be restricted. At the same time, since the side plate 30 is fixedly arranged on the side surface 21 of the battery pack 20, it forms an integrated structure with the battery pack 20, thereby restricting the movement of the battery pack 20 in the third direction Z, thereby preventing the battery pack 20 from moving too far along the third direction Z, which may cause loose connections between battery packs and between the battery pack and circuit control components. In addition, there is no need to add a beam body in the box body 10 to restrict the movement of the battery pack 20 in the third direction Z, thereby improving the space utilization inside the box body 10 and improving the energy density of the entire battery pack 1.

[0049] In some embodiments, reference Figure 2 to Figure 6 At least two first protrusions 31 on the side plate 30 are bent relative to each other along the third direction Z at one end away from the battery pack 20 in the first direction X. Specifically, the number of the first protrusions 31 on the side plate 30 is four, which are arranged in groups of two and spaced apart along the third direction Z. The two first protrusions 31 in each group are bent relative to each other along the third direction Z. Specifically, Figure 3 In the illustrated embodiment, the bending manner of the two first protrusions 31 of each group is that the first protrusion 31 close to the first surface 13 of the box body 10 in the third direction Z is bent in the direction close to the second surface 14, and the first protrusion 31 close to the second surface 14 in the third direction Z is bent in the direction close to the first surface 13, thereby forming a relative bending of the two first protrusions 31 in each group along the third direction Z. The structural design of the two first protrusions 31 bending relative to each other along the third direction Z can reduce the opening of the limiting cavity 311. After the first protrusion 121 is inserted into the limiting cavity 311, the distance between the end of the first protrusion 31 away from the battery pack 20 in the first direction X and the first protrusion 121 in the third direction Z can be shortened, thereby increasing the degree of restriction on the battery pack 20 in the third direction Z and shortening the movement of the battery pack 20 in the third direction Z as much as possible.

[0050] specific Figure 3 to Figure 6In the illustrated embodiment, after the two first protrusions 31 in each group are relatively bent along the third direction Z, the shape of each first protrusion 31 is arc-shaped, and the two first protrusions 31 form a clamp-shaped structure. The design of the clamp-shaped structure can reduce the opening of the limiting cavity 311, thereby improving the cooperation between the first protrusion 121 and the limiting cavity 311. Moreover, the arc-shaped structural design after the first protrusion 31 is bent can give the first protrusion 31 a certain elasticity, so that the first protrusion 31 can form a buffer when limiting the movement of the battery pack 20 along the third direction Z and abutting against the first protrusion 121, thereby improving the service life of the first protrusion 31. In other implementations of the present application, the bending form of the first protrusion 31 can be L-shaped or other bending forms, but it is necessary to meet the requirement that the first protrusion 121 can be inserted into the limiting cavity 311.

[0051] In some embodiments, reference Figure 2-3 as well as Fig. 9 The side wall 11 of the box body 10 is provided with a second protruding portion 122 on one side facing the accommodating cavity 101. The second protruding portion 122 is provided at one end of the side wall 11 close to the opening 131 in the third direction Z. Specifically, the second protruding portions 122 are provided on the opposite surfaces of the first side wall 111 and the second side wall 112. The second protruding portion 122 on the first side wall 111 is provided at one end of the first side wall 111 close to the opening 131 in the third direction Z. The second protruding portion 122 on the second side wall 112 is provided at one end of the second side wall 112 close to the opening 131 in the third direction Z. The second protruding portion 122 extends along the second direction Y. Figure 3 to Figure 6 The side plate 30 is provided with a second protrusion 32 on one side facing away from the battery pack 20 in the first direction X. The second protrusion 32 is provided at one end of the side plate 30 close to the opening 131 in the third direction Z. The second protrusion 32 extends along the second direction Y. Figure 2 and Figure 3 The second protrusion 32 abuts against the second protrusion 122. Specifically, the second protrusion 32 abuts against the second protrusion 122 along the first direction X. The cooperation between the second protrusion 32 and the second protrusion 122 can form a restriction on the movement of the battery pack 20 along the first direction X, further ensuring the stability of the internal battery pack when the battery pack 1 is shaken or subjected to external impact.

[0052] In some embodiments, reference Figure 3 , Figure 5 and Figure 6, a third protrusion 33 is protruding from a side of the side plate 30 that is away from the battery pack 20 in the first direction X. The third protrusion 33 extends along the second direction Y. Along the third direction Z, the third protrusion 33 is arranged between the second protrusion 122 and the adjacent first protrusion 31. The third protrusion 33 is bent in the direction close to the opening 131 at one end away from the battery pack 20 in the first direction X. The third protrusion 33 can abut against the second protrusion 122. Specifically, the third protrusion 33 can abut against a side of the second protrusion 122 that is away from the opening 131 in the third direction Z to limit the movement of the battery pack 20 in the third direction Z. When the battery pack 1 shakes or is subjected to an external impact, causing the battery pack 20 to move along the third direction Z toward the opening 131, the third protrusion 33 moves with the battery pack 20 in the third direction Z and abuts against the second protrusion 122, thereby limiting the movement of the battery pack 20 in the third direction Z. Specifically, Figure 3 , Figure 5 and Figure 6 In the embodiment shown, the third protrusion 33 is curved after being bent along the third direction Z. The curved structural design can give the third protrusion 33 a certain elasticity, so that when the third protrusion 33 abuts against the second protrusion 122, a buffer can be formed, thereby improving the service life of the third protrusion 33.

[0053] In some embodiments, reference Figure 1 , Figure 2 , Figure 4 , Figure 7 and Fig.10 The battery pack 1 further includes a support beam 40, which is disposed in the accommodating cavity 101 of the box body 10. The support beam 40 extends along the second direction Y and is inscribed in the box body 10. Specifically, one end of the support beam 40 in the second direction Y abuts against the first end wall 151 of the box body 10, and the other end of the support beam 40 in the second direction Y abuts against the second end wall 152 of the box body 10. The support beam 40 divides the accommodating cavity 101 into at least two compartments 102 spaced apart along the first direction X. Specifically, Figure 1 and Figure 7 In the illustrated embodiment, there are two support beams 40 in the box 10, and the two support beams 40 divide the accommodating cavity 101 into three compartments 102 arranged at intervals along the first direction X, and each compartment 102 accommodates a battery pack 20. The arrangement of the support beams 40 in the box 10 forms a restriction on the battery pack 20 in the first direction X by means of the compartments 102, thereby improving the stability of the battery pack 20 in the accommodating cavity 101, and the support beams 40 can improve the overall strength of the box 10, and improve the service life and impact resistance of the battery pack 1.

[0054] In some embodiments, the support beam 40 has two side edges 41 arranged opposite to each other along the first direction X, and at least one first protrusion 42 is protruded from each side of the two side edges 41 facing the battery pack 20. Figure 4 and Fig.10 In the embodiment shown, the two side edges 41 include a first side edge 411 and a second side edge 412. The first side edge 411 is provided with two first protruding portions 42 on one side facing away from the second side edge 412 in the first direction X. The second side edge 412 is provided with two first protruding portions 42 on one side facing away from the first side edge 411 in the first direction X. The first protruding portions 42 extend along the second direction Y. The two first protruding portions 42 on each side edge 41 are arranged at intervals along the third direction Z. Figure 4 , the first protrusion 42 is inserted into the limiting cavity 311 adjacent to the first direction X to limit the movement of the battery pack 20 in the third direction Z. Specifically, the first protrusion 42 is inserted into the limiting cavity 311 defined by a group of first protrusions 31 on the side plate 30 adjacent to the first direction X. When the battery pack 1 shakes or is subjected to external impact, causing the battery pack 20 to move along the third direction Z, the first protrusion 31 cooperates with the first protrusion 42 to form a restriction on the movement of the side plate 30 in the third direction Z. At the same time, since the side plate 30 and the battery pack 20 are fixedly connected to form an integral body, the movement of the battery pack 20 in the third direction Z can be formed to ensure the stability of the battery pack 20 in the box body 10.

[0055] In some embodiments, reference Figure 4 and Fig.10 The side edge 41 of the support beam 40 is provided with a first protrusion 42 protruding toward one side of the battery pack 20 in the first direction X. The first protrusion 42 is provided at one end of the side edge 41 close to the opening 131 of the box body 10 in the third direction Z. The first protrusion 42 extends along the second direction Y. Figure 4 The first protrusion 42 can abut against the second protrusion 32 of the side plate 30 adjacent to the first direction X. Specifically, the second protrusion 32 abuts against the first protrusion 42 along the first direction X. The cooperation between the second protrusion 32 and the first protrusion 42 forms a restriction on the movement of the side plate 30 in the third direction Z. At the same time, since the side plate 30 and the battery pack 20 are fixedly connected to form an integral whole, the movement of the battery pack 20 along the first direction X can be restricted, further ensuring the stability of the internal battery pack when the battery pack 1 is shaken or subjected to external impact.

[0056] In some embodiments, reference Figure 4, the third protrusion 33 on the side plate 30 adjacent to the side edge 41 of the support beam 40 in the first direction X can abut against the second protrusion 43. Specifically, the third protrusion 33 can abut against a side of the second protrusion 43 away from the opening 131 in the third direction Z to limit the movement of the battery pack 20 in the third direction Z. When the battery pack 1 shakes or is subjected to an external impact, causing the battery pack 20 to move in the third direction Z toward the opening 131, the third protrusion 33 moves along the third direction Z with the battery pack 20 and abuts against the second protrusion 43, thereby limiting the movement of the side plate 30 in the third direction Z. At the same time, since the side plate 30 and the battery pack 20 are fixedly connected to form an integral body, the movement of the battery pack 20 in the third direction Z is limited.

[0057] In some embodiments, a support beam 40 is disposed in the accommodating cavity 101 of the box body 10, but the first protrusion 42 and the second protrusion 43 are not disposed on the first side 411 and the second side 412 of the support beam 40. The first side 411 and the second side 412 are respectively abutted against the adjacent side panels 30, and the support beam 40 forms a limit for the battery pack 20 in the first direction X.

[0058] In some embodiments, reference Figure 3 and Figure 4 The side panel 30 includes a first end face 34 and a second end face 35 which are arranged opposite to each other along a third direction Z. The first end face 34 is close to the first face 13 of the box body 10 in the third direction Z, and the second end face 35 is close to the second face 14 of the box body 10 in the third direction Z. There is a first gap 36 between the second end face 35 and the second face 14 in the third direction Z. In some embodiments, the side panel 30 is fixedly mounted on the first side face 211 and the second side face 212 of the battery pack 20 by means of thermal conductive adhesive, respectively, so as to form an integrated structure with the battery pack 20. The design of the first gap 36 between the second end face 35 of the side panel 30 and the second face 14 of the box body 10 provides an overflow space for the thermal conductive adhesive between the side panel 30 and the battery pack 20, thereby ensuring the assembly stability and firmness between the side panel 30 and the battery pack 20. In addition, the structural design of the first gap 36 can release a certain expansion force when the battery pack 20 expands and deforms during the cycle use, thereby preventing the battery cells 201 in the battery pack 20 from loosening from the side panel 30 due to expansion.

[0059] In some embodiments, reference Figure 3, there is a second gap 37 between the end surface of the first protrusion 121 on the side wall 11 of the box body 10 facing the end of the battery pack 20 in the first direction X and the end surface of the side plate 30 facing away from the end of the battery pack 20 in the first direction X. In other words, the first protrusion 121 is inserted into the limiting cavity 311 defined by the two first protrusions 31 of the side plate 30 in the first direction X toward the end of the battery pack 20, but the end of the first protrusion 121 extending into the limiting cavity 311 does not abut against the side plate 30, but abuts against the end of the side plate 30 facing away from the battery pack 20 in the first direction X. A second gap 37 is left between the surfaces. The structural design of the second gap 37 provides expansion space for the battery cell 201 in the battery pack 20 to release the pressure generated by the expansion deformation when the battery cell 201 in the battery pack 20 expands and deforms along the first direction X during the cyclic charge and discharge process. Combined with the structural design of the two first protrusions 31 being relatively bent along the third direction Z, the first protrusions 31 can be adaptively deformed according to the expansion deformation of the battery pack 20 in the first direction X, absorb the pressure generated by the expansion deformation, and relieve the extrusion of the side wall 11 of the box body 10 due to the expansion deformation.

[0060] In some embodiments, reference Figure 4 , the first protrusion 42 on the side 41 of the support beam 40 faces the end surface of the adjacent side plate 30 in the first direction X, and there is a second gap 37 between the side surface of the side plate 30 facing away from the battery pack 20 in the first direction X. In other words, the first protrusion 42 is inserted into the limiting cavity 311 defined by the two first protrusions 31 of the side plate 30 in the first direction X, facing the end of the battery pack 20, but the end of the first protrusion 42 extending into the limiting cavity 311 does not abut against the side plate 30, but is in contact with the side surface of the side plate 30 facing away from the battery pack 20 in the first direction X. A second gap 37 is left in between. The structural design of the second gap 37 provides expansion space for the expansion deformation to release the pressure generated by the expansion deformation when the battery cell 201 in the battery pack 20 expands and deforms along the first direction X during the cyclic charge and discharge process. Combined with the structural design of the two first protrusions 31 being relatively bent along the third direction Z, the first protrusions 31 can be adaptively deformed according to the expansion deformation of the battery pack 20 in the first direction X, absorb the pressure generated by the expansion deformation, and relieve the extrusion of the side 41 of the support beam 40 due to the expansion deformation.

[0061] In some embodiments, reference Figure 3 and Figure 4In the first direction X, a second gap 37 exists between an end surface of the first protrusion 121 facing one end of the battery pack 20 and an end surface of the side plate 30 facing away from the battery pack 20 . The side plate 30 is arranged on the side 21 of the battery pack 20. Specifically, the first side 211 of the battery pack 20 is formed by the first surfaces 2011 of the eight battery cells 201 close to one end of the first side wall 111 in the first direction X, and the second side 212 is formed by the second surfaces 2012 of the eight battery cells 201 close to one end of the second side wall 112 in the first direction X. Since the first surface 2011 and the second surface 2012 are the surfaces with the largest surface areas among the six surfaces of the battery cell 201, the first side 211 and the second side 212 are the surfaces with the largest surface areas among the six surfaces of the battery pack 20. When the battery pack 20 expands and deforms, the expansion deformation amplitude generated by the first side 211 and the second side 212 is the largest. The side plate 30 is arranged on the two side surfaces 21 of the battery pack 20 with the largest surface areas, combined with the structural design of the second gap 37, which can effectively alleviate the pressure generated by the expansion deformation and improve the service life of the battery pack 1.

[0062] In some embodiments, reference Figure 6 The side plate 30 includes a first substrate 301 and a second substrate 302 stacked along a first direction X, and the first substrate 301 is in contact with the side surface 21 of the battery pack 20. Specifically, the first substrate 301 is fixed to the side surface 21 of the battery pack 20 by bonding with a thermally conductive adhesive, the second substrate 302 is arranged on a side of the first substrate 301 facing away from the battery pack 20 in the first direction X, the first protrusion 31 is arranged on a side of the second substrate 302 facing away from the first substrate 301 in the first direction X, the third protrusion 33 is arranged on a side of the second substrate 302 facing away from the first substrate 301 in the first direction X, and the second protrusion 32 is arranged on a side of the first substrate 301 facing away from the battery pack 20 in the first direction X. Specifically, Figure 6 In the illustrated embodiment, a groove 303 is formed on a surface of the first substrate 301 facing away from the battery pack 20 in the first direction X, and the second substrate 302 is embedded in the groove 303 .

[0063] In some embodiments, the rigidity of the first substrate 301 is greater than that of the second substrate 302. The first substrate 301 is in contact with the battery pack 20. The larger rigidity design of the first substrate 301 relative to the second substrate 302 can enhance the overall rigidity of the battery pack 20. The elastic modulus of the second substrate 302 is greater than that of the first substrate 301. The first protrusion 31 and the third protrusion 33 are both arranged on the second substrate 302. When the battery pack 20 expands and deforms, the higher elastic modulus of the second substrate 302 relative to the first substrate 301 facilitates the deformation of the first protrusion 31 and the third protrusion 33 to absorb the pressure generated by the expansion deformation, and facilitates the assembly between the side wall 11 of the box 10 and the adjacent side plate 30, and facilitates the assembly between the side edge 41 of the support beam 40 and the adjacent side plate 30. In addition, the higher elastic modulus of the second substrate 302 relative to the first substrate 301 can absorb the energy generated by the collision impact when the side wall 11 of the battery pack 1 is impacted, thereby increasing the service life of the battery pack 1 and ensuring the safety of the battery pack 1.

[0064] In some embodiments, the first substrate 301 is an aluminum plate, and the second substrate 302 is a plastic plate. In other implementations, the first substrate 301 and the second substrate 302 may be made of other materials according to actual use requirements, but the rigidity of the first substrate 301 is greater than that of the second substrate 302, and the elastic modulus of the second substrate 302 is greater than that of the first substrate 301.

[0065] The technical solutions provided by the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (10), the box body (10) having a first direction (X) and a third direction (Z) intersecting each other, the box body (10) comprising two side walls (11) arranged opposite to each other along the first direction (X), a receiving cavity (101) being provided inside the box body (10), and at least one first protrusion (121) being protrudingly provided on one side of the two side walls (11) facing the receiving cavity (101); A battery pack (20) is arranged in the accommodating cavity (101), the battery pack (20) having two side surfaces (21) arranged opposite to each other along the first direction (X); A side plate (30) is arranged in the accommodating cavity (101), one side plate (30) being fixedly arranged on each of the two side surfaces (21), and at least two first protrusions (31) are protrudingly arranged on a side of the side plate (30) that is away from the battery pack (20) in the first direction (X), and the at least two first protrusions (31) are arranged at intervals along the third direction (Z) and define a limiting cavity (311); Wherein, the first protrusion (121) is inserted into the limiting cavity (311) to limit the movement of the battery pack (20) in the third direction (Z).

2. The battery pack according to claim 1, characterized in that: Along the first direction (X), the ends of the two first protrusions (31) facing away from the battery pack (20) are bent relative to each other along a third direction (Z) in directions approaching each other.

3. The battery pack according to claim 1, wherein: The box body (10) comprises a first surface (13) and a second surface (14) arranged opposite to each other along the third direction (Z), and an opening (131) is formed on the first surface (13); A second protrusion (122) is protruding from one side of the side wall (11) facing the accommodating cavity (101), and the second protrusion (122) is arranged at an end of the side wall (11) close to the opening (131) in the third direction (Z); A second protrusion (32) is protrudingly provided on a surface of the side plate (30) that is away from the battery pack (20) in the first direction (X), and the second protrusion (32) abuts against the second convex portion (122).

4. The battery pack according to claim 3, characterized in that: A third protrusion (33) is protrudingly provided on a side of the side plate (30) facing away from the battery pack (20) in the first direction (X); Along the third direction (Z), the third protrusion (33) is arranged between the second protrusion (122) and the adjacent first protrusion (31); The third protrusion (33) is bent in the first direction (X) at one end away from the battery pack (20) toward the opening (131); The third protrusion (33) can abut against the second convex portion (122) to limit the movement of the battery pack (20) in the third direction (Z).

5. The battery pack according to claim 4, characterized in that: The box body (10) further has a second direction (Y), the first direction (X), the second direction (Y) and a third direction (Z) intersect each other, the battery pack further comprises a support beam (40), the support beam (40) is arranged in the accommodating cavity (101), the support beam (40) extends along the second direction (Y) and is inscribed in the box body (10), the support beam (40) divides the accommodating cavity (101) into compartments (102) arranged at intervals along the first direction (X) and used to accommodate the battery pack (20); The support beam (40) has two side edges (41) arranged opposite to each other along the first direction (X), and at least one first protrusion (42) is respectively provided on one side of the two side edges (41) facing the battery pack (20), and the first protrusion (42) is inserted into the adjacent limiting cavity (311) in the first direction (X) to limit the movement of the battery pack (20) in the third direction (Z).

6. The battery pack according to claim 5, characterized in that: A second protrusion (43) is protruding from one side of the side edge (41) facing the battery pack (20), and the second protrusion (43) is arranged at an end of the side edge (41) close to the opening (131) in the third direction (Z); The second protruding portion (43) is capable of abutting against the second protruding portion (32).

7. The battery pack according to claim 6, characterized in that: The third protrusion (33) on the side plate (30) adjacent to the side edge (41) is capable of abutting against the second protrusion (43).

8. The battery pack according to claim 1, wherein: The box body (10) comprises a first surface (13) and a second surface (14) arranged opposite to each other along the third direction (Z); the side panel (30) comprises a first end surface (34) and a second end surface (35) arranged opposite to each other along the third direction (Z); along the third direction (Z), a first gap (36) exists between the second end surface (35) and the second surface (14).

9. The battery pack according to claim 1, characterized in that: The side plate (30) comprises a first substrate (301) and a second substrate (302) stacked along the first direction (X), the first substrate (301) abutting against a side surface (21) of the battery pack (20), and the first protrusion (31) being arranged on a side of the second substrate (302) facing away from the first substrate (301) in the first direction (X); The rigidity of the first substrate (301) is greater than the rigidity of the second substrate (302); The elastic modulus of the second substrate (302) is greater than the elastic modulus of the first substrate (301).

10. The battery pack according to claim 1, wherein: Along the first direction (X), a second gap (37) exists between an end surface of the first protrusion (121) facing one end of the battery pack (20) and an end surface of the side plate (30) facing away from the battery pack (20).

11. An electrical device, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 10.

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