Battery pack and electric equipment

Abstract

According to the battery pack, a first side wall of a liquid cooling plate abuts against a first wall of a single battery, a first supporting part is arranged on the side, away from the single battery, of the liquid cooling plate, a supporting cavity is formed in the first supporting part, and a first rib plate is arranged in a flow channel of the liquid cooling plate; the first rib plate is arranged in the supporting cavity, the second rib plate is arranged in the supporting cavity, the orthographic projection of the first rib plate and the orthographic projection of the second rib plate are at least partially not overlapped, and when the first face of the box body is impacted, the supporting cavity and the flow channel buffer and absorb impact force generated by impact. The first rib plates and the second rib plates which are arranged in a staggered manner can support the liquid cooling plate and the first supporting part respectively, so that the strength of the liquid cooling plate and the first supporting part is improved, the risk of liquid leakage after the single battery is impacted is reduced, the heat conduction area between the two end walls is reduced through the design of the supporting cavity, and more air can be accommodated; the low heat conductivity coefficient of air is used for heat insulation, and the use performance of the battery pack at low temperature is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and electrical equipment. Background Art

[0002] In existing battery packs, the thermal resistance between the bottom wall of the battery cell and the bottom surface of the box is small, and the thermal insulation performance is poor, which affects the performance of the battery pack in a low temperature environment. In addition, the protection ability of the bottom surface of the box is weak, which can easily cause the battery cell to be damaged and leak when impacted. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electrical device to solve the problems of poor thermal insulation and weak anti-collision ability of the bottom surface of the box body in the current battery pack.

[0004] A first aspect of an embodiment of the present application provides a battery pack having a third direction, the battery pack comprising: a box body having a receiving cavity therein; a battery cell disposed in the receiving cavity, the battery cell having a first wall intersecting the third direction; a liquid cooling plate having a flow channel for a heat-conducting fluid therein, the liquid cooling plate comprising a first side wall and a second side wall disposed opposite to each other along the third direction, the first side wall abutting against the first wall, a first rib plate being disposed in the flow channel, and two ends of the first rib plate being connected to the first side wall and the second side wall respectively along the third direction; a support member disposed at the third direction. The accommodating cavity includes a first supporting portion, a supporting cavity is provided inside the first supporting portion, the first supporting portion includes two end walls arranged opposite to each other along the third direction, one of the end walls abuts against the second side wall, a second rib is provided in the supporting cavity, and along the third direction, the two ends of the second rib are respectively connected to the two end walls; along the third direction, the plane where the side of the end wall away from the second side wall facing the liquid cooling plate is located is the projection plane, and the orthographic projection of the first rib on the projection plane and the orthographic projection of the second rib on the projection plane at least partially do not overlap.

[0005] Optionally, the battery pack also has a first direction intersecting with the third direction; the first rib is perpendicular to the first side wall and the second side wall, respectively, and the second rib is perpendicular to the two end walls, respectively; along the first direction, the orthographic projection of the first rib on the projection plane and the orthographic projection of the second rib on the projection plane are both spaced apart; along the third direction, the spacing between the two end walls is greater than the thickness of one of the end walls.

[0006] Optionally, the battery pack also has a first direction intersecting with the third direction; the battery pack also includes a protective layer, and the support member also includes a second supporting portion; the second supporting portion is arranged on at least one side of the first supporting portion in the first direction, and the second supporting portion is connected to the first supporting portion along the first direction; the second supporting portion and the first wall are spaced apart along the third direction, and the protective layer is arranged between the second supporting portion and the first wall; the protective layer is connected to both the second supporting portion and the first wall.

[0007] Optionally, the support member includes at least two first support portions, and at least two first support portions are arranged at intervals along the first direction; along the first direction, a second support portion is respectively arranged on two opposite sides of the first support portion, and two adjacent first support portions are connected via the second support portion.

[0008] Optionally, the battery pack further includes a buffer component having a buffer cavity disposed therein; the box body includes a first surface intersecting with the third direction, a gap exists between the second support portion and the first surface, and the buffer component is disposed in the gap; along the third direction, one end of the buffer component adjacent to the second support portion abuts against the second support portion, and one end of the buffer component adjacent to the first surface abuts against the first surface.

[0009] Optionally, the battery pack further includes a support bar, which is arranged between the buffer member and the second support portion; along the third direction, one end of the support bar adjacent to the buffer member abuts against the buffer member, and one end of the support bar adjacent to the second support portion abuts against the second support portion.

[0010] Optionally, the box body includes a first surface intersecting with the third direction; along the third direction, the distance between the side of the first support portion facing away from the first surface and the first surface is H1 mm, and the distance between the side of the second support portion facing away from the first surface and the first surface is H2 mm, satisfying: H1<H2.

[0011] Optionally, the support member also includes a reinforcing wall, which is arranged on a side of the second supporting portion away from the first supporting portion in the first direction; the box body includes a first surface intersecting with the third direction; along the third direction, one end of the reinforcing wall adjacent to the first surface is connected to the second supporting portion, and the distance between the end surface of the reinforcing wall away from the first surface and the first surface is H3 mm, and the distance between the first wall and the first surface is H4 mm, satisfying: H4<H3.

[0012] Optionally, the battery pack also includes a side panel, a first adhesive layer and a second adhesive layer; the side panel is arranged in the accommodating cavity, a cavity is arranged inside the side panel, the side panel is arranged on the side of the reinforcing wall away from the first supporting portion in the first direction, the first adhesive layer is arranged between the side panel and the reinforcing wall, and the side panel is adhesively connected to the reinforcing wall through the first adhesive layer; the second adhesive layer is arranged on the side of the first surface facing the supporting member in the third direction, and the first supporting portion is adhesively connected to the first surface through the second adhesive layer.

[0013] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0014] 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 formed by abutting the first side wall of a liquid cooling plate with the first wall of a battery cell, and providing a first support portion on the side of the liquid cooling plate away from the battery cell in a third direction, a support cavity is provided inside the first support portion, and a first rib plate abutting the first side wall and the second side wall respectively is provided in the flow channel of the liquid cooling plate, and a second rib plate connected to the two end walls respectively is provided in the support cavity, one end wall abuts the second side wall, and the other end wall is away from the second side wall, and the side of the other end wall away from the second side wall facing the liquid cooling plate is used as the projection plane. Moreover, in the third direction, the orthographic projection of the first rib plate on the projection plane and the orthographic projection of the second rib plate on the projection plane at least partially do not overlap, so that when the first side of the box body is impacted, the support cavity and the flow channel can form a buffer and absorption of the impact force generated by the impact, and the staggered first rib plate and the second rib plate can respectively provide support for the liquid cooling plate and the first support part, thereby improving the strength of the liquid cooling plate and the first support part and reducing the risk of leakage of the battery cell after being impacted. In addition, the design of the support cavity can reduce the heat conduction area between the two end walls, and the support cavity can accommodate more air, using the low thermal conductivity of air for insulation, improving the thermal insulation performance, playing a role in thermal insulation, and thereby improving the performance of the battery pack under low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0017] Figure 2It is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application after the upper box is removed;

[0018] Figure 3 yes Figure 2 AA section view;

[0019] Figure 4 Figure 3 A front view of

[0020] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at B;

[0021] Figure 6 yes Figure 4 A schematic diagram of the enlarged structure at C;

[0022] Figure 7 It is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application after removing the upper box body and the battery cell;

[0023] Figure 8 yes Figure 7 The enlarged structural diagram of point D after removing the lower box body;

[0024] Fig. 9 yes Figure 7 The front view after removing the lower box;

[0025] Fig.10 yes Fig. 9 A schematic diagram of the structure at E of FIG.

[0026] Fig.11 yes Fig. 9 Partial exploded view;

[0027] Fig.12 is a schematic diagram of the structure of a liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0028] Fig.13 is a schematic diagram of the structure of a support member in a battery pack provided in an embodiment of the present application;

[0029] Fig.14 It is a schematic diagram of the combined structure of the buffer and the support bar in the battery pack provided in the embodiment of the present application;

[0030] Fig.15 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0031] Description of main reference numerals:

[0032] 1. Battery pack;

[0033] 10. Box body, 10a. upper box body, 10b. lower box body, 101. accommodating cavity, 11. first surface, 12. second surface;

[0034] 20. Battery cell, 21. First wall, 22. Second wall, 23. Third wall, 24. Fourth wall, 25. Fifth wall, 26. Sixth wall;

[0035] 30. Liquid cooling plate, 301. Flow channel, 31. First side wall, 32. Second side wall, 33. First rib plate;

[0036] 40. support member, 41. first support portion, 410. support cavity, 411. end wall, 4111. first end wall, 4112. second end wall, 412. second rib plate, 42. second support portion, 420. gap, 43. reinforcing wall, 431. first end, 432. second end;

[0037] 50, protective layer, 60, buffer member, 601, buffer cavity, 61, support bar, 70, side plate, 701, cavity, 71, first adhesive layer, 72, second adhesive layer;

[0038] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0039] 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.

[0040] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 used for descriptive purposes only, 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 said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0041] 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.

[0042] 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.

[0043] 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%.

[0044] This embodiment provides an electric device, including a battery pack 1, and the battery pack 1 serves as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0045] In some embodiments of the present application, a battery pack 1 is provided, referring to Figure 1 to Figure 15 The battery pack 1 includes: a box body 10, a battery cell 20, a liquid cooling plate 30 and a support 40. The battery pack 1 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 to Figure 15 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0046] Reference Figure 1-2The box body 10 is provided with a receiving cavity 101 inside. Specifically, the box body 10 includes an upper box body 10a and a lower box body 10b. The upper box body 10a and the lower box body 10b are buckled together along the third direction Z to form the box body 10 and define the receiving cavity 101 inside. Figure 1 to Figure 7 The box body 10 includes a first surface 11 intersecting with the third direction Z. Figure 1 to Figure 7 In the embodiment shown, the plane where the first surface 11 is located is orthogonal to the third direction Z. Figure 1 The box body 10 further includes a second surface 12 intersecting the third direction Z. In other words, the first surface 11 and the second surface 12 are arranged opposite to each other along the third direction Z. Figure 1 and Figure 2 In the illustrated embodiment, the first direction X is parallel to the length direction of the box body 10 , the second direction Y is parallel to the width direction of the box body 10 , and the third direction Z is parallel to the height direction of the box body 10 .

[0047] Reference Figure 2 to Figure 7 The battery cell 20 is disposed in the receiving cavity 101 of the box body 10, referring to Figures 4 to 6 The battery cell 20 has a first wall 21 intersecting with the third direction Z, as shown in FIG. Fig.15 In the illustrated embodiment, the battery cell 20 includes a first wall 21 and a second wall 22 that are relatively arranged along a third direction Z, a third wall 23 and a fourth wall 24 that are relatively arranged along a first direction X, and a fifth wall 25 and a sixth wall 26 that are relatively arranged along a second direction Y. The third wall 23, the fifth wall 25, the fourth wall 24 and the sixth wall 26 are sequentially connected end to end to form a shell structure with open ends. The first wall 21 and the second wall 22 respectively cover the open ends to form a closed hexahedron. The fifth wall 25 and the sixth wall 26 are the walls with the largest surface areas among the six walls.

[0048] Reference Figure 3 to Figure 5 as well as Figure 7 to Figure 12 The liquid cooling plate 30 is disposed in the accommodating cavity 101 of the box body 10, referring to Figure 5 , Figure 8 , Fig.10 as well as Fig.12 , the liquid cooling plate 30 is provided with a flow channel 301 for the flow of heat transfer fluid, referring to Figure 5 , Fig.10 as well as Fig.12 The liquid cooling plate 30 includes a first side wall 31 and a second side wall 32 arranged opposite to each other along the third direction Z. Figure 5 The first side wall 31 abuts against the first wall 21 of the battery cell 20 along the third direction Z, referring to Figure 5 , Figure 8 , Fig.10 as well as Fig.12A first rib plate 33 is provided in the flow channel 301, and along the third direction Z, two ends of the first rib plate 33 are respectively connected to the first side wall 31 and the second side wall 32. In other words, the opposite ends of the first rib plate 33 in the third direction Z are respectively connected to the first side wall 31 and the second side wall 32, and the first rib plate 33 forms a support for the first side wall 31 and the second side wall 32 in the third direction Z, thereby improving the overall strength of the liquid cooling plate 30, especially improving the support strength of the liquid cooling plate 30 in the third direction Z.

[0049] Reference Figure 3 to Figure 11 as well as Fig.13 The support member 40 is disposed in the accommodating cavity 101 of the box body 10, referring to Figures 5 to 11 as well as Fig.13 The support member 40 includes a first support portion 41, referring to Figure 5 , Figure 8 , Fig.10 as well as Fig.13 , a support cavity 410 is provided inside the first support portion 41. Figure 5 , Fig.10 and Fig.13 The first supporting portion 41 includes two end walls 411 arranged opposite to each other along the third direction Z. Figure 5 , Fig.10 and Fig.13 In the embodiment shown, the two end walls 411 include a first end wall 4111 and a second end wall 4112 arranged opposite to each other along the third direction Z. Figure 5 and Fig.10 , one of the end walls 411 abuts against the second side wall 32 of the liquid cooling plate 30, as shown in FIG. Figure 5 and Fig.10 In the illustrated embodiment, the first end wall 4111 abuts against the second side wall 32 along the third direction Z. Figure 5 , Figure 8 , Fig.10 and Fig.13 A second rib plate 412 is provided in the support cavity 410. Along the third direction Z, two ends of the second rib plate 412 are respectively connected to the two end walls 411. Figure 5 , Fig.10 and Fig.13 In the illustrated embodiment, the second rib plate 412 includes two ends arranged opposite to each other along the third direction Z, one end is connected to the first end wall 4111, and the other end is connected to the second end wall 4112. The second rib plate 412 supports the first end wall 4111 and the second end wall 4112 in the third direction Z, thereby improving the overall strength of the first support portion 41, especially improving the support strength of the first support portion 41 in the third direction Z. The second end wall 4112 of the first support portion 41 abuts against the first surface 11 of the box body 10 along the third direction Z.

[0050] In some embodiments, along the third direction Z, the plane on which the end wall 411 away from the second side wall 32 faces the liquid cooling plate 30 is the projection plane. Specifically, refer to Figure 5 , taking the side of the second end wall 4112 facing the liquid cooling plate 30 in the third direction Z as the projection plane, the orthographic projection of the first rib plate 33 on the projection plane and the orthographic projection of the second rib plate 412 on the projection plane at least partially do not overlap.

[0051] In existing battery packs, in order to keep the battery cells in the battery pack at a suitable operating temperature, a liquid cooling plate is usually provided at the bottom wall of the battery cell. The circulation of the heat-conducting fluid inside the liquid cooling plate can form heat exchange with the battery cell, so that the battery cell is at a suitable operating temperature. However, the liquid cooling plate in existing battery packs is usually in direct contact with the bottom surface of the box, resulting in a small thermal resistance between the liquid cooling plate and the bottom surface of the box, and the box has poor thermal insulation performance for the liquid cooling plate. Especially in a low temperature environment, the bottom surface of the box cannot form a barrier to the lower temperature, resulting in a low temperature of the heat-conducting fluid in the liquid cooling plate, which in turn leads to a low operating temperature of the battery cell, affecting the charge and discharge rate and capacity retention rate of the battery cell in a low temperature environment, and further affecting the performance of the battery pack in a low temperature environment. In addition, the protection capability of the bottom surface of the box in the existing battery pack is weak, and most of the impact force generated when the bottom surface is hit is transmitted to the battery cell, resulting in an increased risk of damage and leakage of the battery cell, affecting the safety of the battery pack.

[0052] The battery pack 1 provided in the embodiment of the present application abuts the first side wall 31 of the liquid cooling plate 30 against the first wall 21 of the battery cell 20, and a first rib plate 33 is arranged in the flow channel 301 of the liquid cooling plate 30, and the first rib plate 33 is respectively connected to the first side wall 31 and the second side wall 32 at both ends in the third direction Z, thereby enhancing the supporting strength of the liquid cooling plate 30 in the third direction Z. A first support portion 41 is provided on a side of the liquid cooling plate 30 away from the battery cell 20 in the third direction Z, a support cavity 410 is provided inside the first support portion 41, and a second rib plate 412 is provided inside the support cavity 410, and two ends of the second rib plate 412 in the third direction Z are respectively connected to the two end walls 411 of the first support portion 41, so as to enhance the support strength of the first support portion 41 in the third direction Z, and a side of the second end wall 4112 facing the liquid cooling plate 30 in the third direction Z is taken as a projection plane, and the orthographic projection of the first rib plate 33 on the projection plane and the orthographic projection of the second rib plate 412 on the projection plane at least partially do not overlap, forming at least a portion of the second rib plate 412. The structural design of the plate 412 and the first rib plate 33 being alternately arranged along the first direction X makes it possible that when the first side 11 of the box body 10 is subjected to an external impact, since at least part of the second rib plate 412 and the first rib plate 33 are alternately arranged along the first direction X, the second rib plate 412 will not directly transmit the impact force generated by the impact along the third direction Z to the first rib plate 33, forming a discontinuity in the transmission of the impact force, thereby preventing the impact force from being directly transmitted to the battery cell 20 through the second rib plate 412 and the first rib plate 33, reducing the impact force on the battery cell 20, and effectively reducing the risk of deformation and leakage of the battery cell 20 due to the external impact on the first side 11. In addition, the alternate arrangement of the second rib plate 412 and the first rib plate 33 helps to provide space for the thermal elastic deformation of the first support portion 41 and the liquid cooling plate 30, and can absorb the energy of the impact on the first side 11. In addition, the structural design of the support cavity 410 inside the first support part 41 and the flow channel 301 inside the liquid cooling plate 30 allows the support cavity 410 and the flow channel 301 to accommodate more air. The thermal conductivity of air is low and the thermal resistance is high. Moreover, the design of the support cavity 410 can reduce the heat conduction area between the first end wall 4111 and the second end wall 4112, thereby forming a barrier to the external low temperature in a low temperature environment, playing a role in heat preservation, improving the charge and discharge rate and capacity retention rate of the battery cell 20 in a low temperature state, and improving the performance of the battery pack 1 in a low temperature environment.

[0053] The orthographic projection of the first rib plate 33 on the projection plane and the orthographic projection of the second rib plate 412 on the projection plane are determined as follows:

[0054] After disassembling the battery pack 1 and removing the battery cell 20, the liquid cooling plate 40 and the first support portion 41 stacked along the third direction Z are obtained, and a portion of the first wall 31 connected to the first rib plate 33 is cut off by a tool to expose a portion of the first rib plate 33, and then a portion of the second wall 32 connected to the first rib plate 33 is cut off by a tool, so that one end of the first rib plate 33 in the second direction Y is suspended, and then a first end wall 4111 corresponding to the suspended first rib plate 33 in the third direction Z is cut off by a tool, so that the suspended first rib plate 33 is directly opposite to the projection plane along the third direction Z, and the second rib plate 412 is exposed; wherein, since the first rib plate 33 extends along the second direction Y, even if a portion of the second wall 32 and a portion of the first end wall 4111 are cut off, the suspended first rib plate 33 can still be kept in its original state without deformation;

[0055] Along the third direction Z, a light source is arranged on the side of the suspended first rib plate 33 away from the first support portion 41 to illuminate the suspended first rib plate 33 and the exposed second rib plate 412, so as to obtain the orthographic projection of the first rib plate 33 and the second rib plate 412 on the projection plane. Figure 5 , Figure 8 , Fig.10 and Fig.12 The first rib plate 33 is perpendicular to the first side wall 31 and the second side wall 32, respectively. Figure 5 , Figure 8 , Fig.10 and Fig.13 The second rib plate 412 is perpendicular to the two end walls 411, that is, the second rib plate 412 is perpendicular to the first end wall 4111 and the second end wall 4112, respectively. Figure 5 , Figure 8 and Fig.10 Along the first direction X, the orthographic projection of the first rib plate 33 on the projection plane and the orthographic projection of the second rib plate 412 on the projection plane are arranged at intervals, forming a staggered and spaced arrangement of the first rib plate 33 and the second rib plate 412, thereby improving the discontinuity of the impact force conducted to the first surface 11 of the box body 10, and facilitating the absorption of the impact force received by the first surface 11, thereby ensuring the safety of the battery cell 20.

[0056] In some embodiments, along the third direction Z, the distance between the two end walls 411 of the first support portion 41 is greater than the thickness of one of the end walls 411. Specifically, the distance between the opposing surfaces of the first end wall 4111 and the second end wall 4112 in the third direction Z is greater than the thickness of the first end wall 4111 or the second end wall 4112, thereby providing sufficient elastic deformation space for the first support portion 41, enhancing the impact force of the first support portion 41 on the first surface 11 of the box body 10, and ensuring the safety of the battery pack 1.

[0057] In some embodiments, the orthographic projection of a portion of the first rib 33 on the projection plane overlaps with the orthographic projection of the second rib 412 on the projection plane, and the orthographic projection of another portion of the first rib 33 on the projection plane does not overlap with the orthographic projection of the second rib 412 on the projection plane.

[0058] In some embodiments, the first end wall 4111 and the second end wall 4112 respectively include at least one layer of glass fiber yarn, thereby improving the strength and rigidity of the support member 40, better protecting the battery cell 20, and preventing the bottom of the first wall 21 of the battery cell 20 from being impacted and leaking.

[0059] In some embodiments, the second stiffener 412 includes at least one side layer of fiberglass yarn.

[0060] In some embodiments, reference Figure 5 , Figure 7 to Figure 9 as well as Fig.11 The battery pack 1 also includes a protective layer 50, referring to Figures 5 to 9 as well as Fig.11 and Fig.13 The support member 40 further includes a second support portion 42, which is disposed on at least one side of the first support portion 41 in the first direction X. Fig.11 and Fig.13 In the embodiment shown, a second support portion 42 is provided on opposite sides of the first support portion 41 in the first direction X, and the second support portion 42 is connected to the first support portion 41 along the first direction X. Figure 5 and Figure 6 , the second support portion 42 and the first wall 21 of the battery cell 20 are spaced apart along the third direction Z, the protective layer 50 is disposed between the second support portion 42 and the first wall 21, and the protective layer 50 is connected to both the second support portion 42 and the first wall 21. Among them, the liquid cooling plate 30 cooperates with the first support portion 41 to form support and protection for the middle section of the length of the first wall 21 of the battery cell 20 in the first direction X, and the second support portion 42 forms support for both ends of the first wall 21 in the first direction X. The provision of the protective layer 50 can prevent the second support portion 42 from directly contacting the first wall 21, and can form protection for both ends of the first wall 21 in the first direction X, so as to prevent the first surface 11 of the box body 10 from being hit and causing damage and leakage at both ends of the first wall 21 of the battery cell 20 in the first direction X, thereby further ensuring the safety of the battery cell 20.

[0061] In some embodiments, the second support portion 42 includes at least one layer of woven glass fiber cloth, so that the second support portion 42 is more conducive to protecting the first wall 21 of the battery cell 20 and preventing the bottom of the first wall 21 of the battery cell 20 from being impacted and leaking.

[0062] In some embodiments, the glass fibers in the first end wall 4111, the second end wall 4112, and the second support portion 42 are connected by resins respectively. The resin helps to improve the mechanical strength of the glass fibers, while reducing the heat transfer rate in the support member 40, thereby playing a role in heat preservation and improving the charge and discharge rates and capacity retention rate of the battery cell 20 under low temperature conditions.

[0063] In some embodiments, the protective layer 50 includes a glass fiber cloth layer, and further includes a woven glass fiber cloth layer. The woven glass fiber cloth layer has high toughness, thermal insulation and fire resistance, and can effectively improve the thermal insulation performance of the battery pack 1, thereby ensuring the charge and discharge rate and capacity retention rate of the battery cell 20.

[0064] In some embodiments, reference Figure 7 , Fig. 9 , Fig.11 and Fig.13 The support member 40 includes at least two first support portions 41, which are arranged at intervals along the first direction X. Along the first direction X, two opposite sides of the first support portion 41 are respectively provided with a second support portion 42, and two adjacent first support portions 41 are connected by the second support portion 42. Specifically, two adjacent second support portions 42 along the first direction X are connected to form a connection between the two adjacent first support portions 41, and the first support portion 41 and the two second support portions 42 jointly form a support for the battery cell 20. Wherein, referring to Figure 2 and Figure 3 There are multiple battery cells 20 in the battery pack 1, and the multiple battery cells 20 are arranged at intervals along the second direction Y to form a battery group. The first support parts 41 correspond to the battery groups in number, and the two battery groups are arranged at intervals along the first direction X.

[0065] In some embodiments, reference Figure 3 to Figure 9 as well as Fig.11 and Fig.14 The battery pack 1 also includes a buffer 60, referring to Figure 5-6 , Figure 8 and Fig.14 , the buffer member 60 has a buffer cavity 601 inside, referring to Figure 5, along the third direction Z, there is a gap 420 between the second support portion 42 and the first surface 11, and the buffer 60 is arranged in the gap 420, and, along the third direction Z, one end of the buffer 60 adjacent to the second support portion 42 abuts against the second support portion 42, and one end of the buffer 60 adjacent to the first surface 11 abuts against the first surface 11. The arrangement of the buffer 60 and the design of the buffer cavity 601 inside the buffer 60 can absorb the impact force generated by the impact when the first surface 11 is hit by an external force, and is more conducive to evenly dispersing the force when the force is applied, and is conducive to reducing the local shear stress on the second support portion 42, thereby forming protection for the battery cell 20 and improving the impact resistance of the battery cell 20. In addition, the design of the buffer cavity 601 and the air filled inside can improve the thermal resistance effect, thereby improving the thermal insulation performance of the battery pack 1 and ensuring the performance of the battery pack 1 in a low temperature environment.

[0066] In some embodiments, reference Figure 5-6 , Figure 8 , Fig.11 as well as Fig.14 The battery pack 1 further includes a support bar 61, which is disposed between the buffer 60 and the second support portion 42. Along the third direction Z, one end of the support bar 61 adjacent to the buffer 60 abuts against the buffer 60, and one end of the support bar 61 adjacent to the second support portion 42 abuts against the second support portion 42. Figure 5-6 , Figure 8 , Fig.11 as well as Fig.14 In the illustrated embodiment, the support bar 61 extends along the second direction Y, and there are multiple support bars 61, which are spaced apart along the first direction X. The arrangement of the support bars 61 can avoid direct contact between the buffer 60 and the second support portion 42, and can further disperse the impact force exerted on the buffer 60. The spaced arrangement of the multiple support bars 61 can form a heat dissipation channel, thereby avoiding damage to the buffer 60 due to heat accumulation and improving the service life of the buffer 60.

[0067] In some embodiments, the buffer 60 is made of silicone material, so as to ensure the buffer 60 has an effect of absorbing impact force and a heat preservation effect in a low temperature environment. The buffer 60 is a pultruded profile, and the cross-sectional shape of the buffer cavity 601 is a square shape. In some other implementations, the cross-sectional shape of the buffer cavity 601 can be a triangle, a pentagon, or other shapes. The embodiment of the present application does not further limit the cross-sectional shape of the buffer cavity 601.

[0068] In some embodiments, reference Figure 5-6 , Figure 8 as well as Fig.14Along the third direction Z, the cross-sectional area of ​​the support bar 61 increases from the end close to the buffer 60 to the end close to the second support portion 42, forming an inverted trapezoidal structure design of the support bar 61. While ensuring support for the second support portion 42, the impact force transmitted by the buffer 60 is further reduced, the anti-collision performance of the battery pack 1 is improved, and the safety of the battery cell 20 is ensured.

[0069] In some embodiments, the support bar 61 is made of rubber.

[0070] In some embodiments, reference Figure 6 , along the third direction Z, the spacing between the side of the first support portion 41 away from the first surface 11 and the first surface 11 is H1 mm, specifically, along the third direction Z, the spacing between the side of the first support portion 41 away from the first surface 11 and the side of the first surface 11 facing the first support portion 41 is H1 mm, and the spacing between the side of the second support portion 42 away from the first surface 11 and the first surface 11 is H2 mm, specifically, along the third direction Z, the spacing between the side of the second support portion 42 away from the first surface 11 and the side of the first surface 11 facing the second support portion 42 is H2 mm, satisfying: H1<H2, H1<H2 so that a height difference is formed between the first support portion 41 and the second support portion 42 in the third direction Z, thereby forming a stepped structure, and further, when the liquid cooling plate 30 is arranged on the first support portion 41, along the third direction Z, a side of the first side wall 31 away from the second side wall 32 is coplanar with a side of the second support portion 42 away from the support member 40, thereby ensuring the stability of the first wall 21 of the battery cell 20, ensuring the assembly stability of the battery cell 20 in the box 10 of the battery pack 1, and ensuring the stability of the battery pack 1 in use.

[0071] In some embodiments, reference Figure 5 , Figure 7 to Figure 9 as well as Fig.11 and Fig.13 The support member 40 further includes a reinforcing wall 43, which is disposed on a side of the second support portion 42 away from the first support portion 41 in the first direction X. Along the third direction Z, one end of the reinforcing wall 43 adjacent to the first surface 11 is connected to the second support portion 42. Figure 7 , the distance between the end surface of the reinforcing wall 43 away from the first surface 11 and the first surface 11 is H3 mm, specifically, the distance between the end surface of the reinforcing wall 43 away from the first surface 11 and the surface of the first surface 11 facing the reinforcing wall 43 is H3 mm, referring to Figure 5, the distance between the first wall 21 and the first surface 11 of the battery cell 20 is H4 mm, specifically, the distance between the first wall 21 and the side of the first surface 11 facing the battery cell 20 is H4 mm, satisfying: H4<H3. The provision of the reinforcing wall 43 can increase the overall structural strength of the support member 40, and H4<H3, so that the height of the highest point of the reinforcing wall 43 in the third direction Z relative to the first surface 11 is higher than the height of the first wall 21 of the battery cell 20 relative to the first surface 11, thereby forming a limit and protection for the battery cell 20 in the first direction X, and further improving the assembly stability of the battery cell 20 in the box 10 of the battery pack 1.

[0072] In some embodiments, reference Figure 2 to Figure 5 , Figure 7 to Figure 9 as well as Fig.11 The battery pack 1 further includes a side plate 70 and a first adhesive layer 71. The side plate 70 is disposed in the receiving cavity 101 of the box body 10. Figure 5 and Figure 8 , a cavity 701 is provided inside the side plate 70, and the side plate 70 is arranged on the side of the reinforcing wall 43 away from the first supporting portion 41 in the first direction X. The first adhesive layer 71 is arranged between the side plate 70 and the reinforcing wall 43, and the side plate 70 is adhesively connected to the reinforcing wall 43 through the first adhesive layer 71. The arrangement of the side plate 70 can form protection for the battery cell 20 in the first direction X, and the arrangement of the cavity 701 inside the side plate 70 can form an absorption of the impact force generated by the impact on the battery cell 20 in the first direction X, and the air inside the cavity 701 can improve the thermal resistance of the side plate 70, thereby improving the heat preservation effect of the battery pack 1 in a low temperature environment, ensuring the charge and discharge rate and capacity retention rate of the battery cell 20, and ensuring the performance of the battery pack 1 in a low temperature environment.

[0073] In some embodiments, the first adhesive layer 71 includes foamed adhesive.

[0074] In some embodiments, the first adhesive layer 71 includes glass fiber microbeads. The first adhesive layer 71 with the glass fiber microbeads has high mechanical strength and low thermal conductivity, thereby improving the thermal insulation effect of the battery pack 1 in a low temperature environment, ensuring the charge and discharge rate and capacity retention rate of the battery cell 20, and ensuring the performance of the battery pack 1 in a low temperature environment.

[0075] In some embodiments, reference Figure 5-6 , Figure 8 to Figure 10The battery pack 1 also includes a second adhesive layer 72, which is arranged on a side of the first surface 11 facing the support member 40 in the third direction Z. The first support portion 41 is adhesively connected to the first surface 11 through the second adhesive layer 72, thereby ensuring the assembly stability between the support member 40 and the first surface 11, avoiding the situation in which the support member 40 is separated from the first surface 11 when the first surface 11 is hit, causing damage to the battery cell 20, and ensuring the stability of the battery pack 1.

[0076] In some embodiments, the second adhesive layer 72 includes foamed adhesive.

[0077] In some embodiments, the second adhesive layer 72 includes glass fiber microbeads. The second adhesive layer 72 with the glass fiber microbeads has high mechanical strength and low thermal conductivity. When the temperature of the battery cell 20 decreases, the second adhesive layer 72 with the glass fiber microbeads can slow down the rate at which the temperature of the battery cell 20 decreases, thereby improving the charge and discharge rate and capacity retention rate of the battery cell 20 in a low temperature environment.

[0078] In some embodiments, a limiter is provided on the first surface 11 to determine and limit the thickness of the second adhesive layer 72 in the third direction Z, thereby ensuring the thickness of the second adhesive layer 72 and further ensuring the mechanical strength and thermal insulation performance of the second adhesive layer 72 .

[0079] In some embodiments, the first surface 11 includes at least one of a glass fiber cloth layer and a glass fiber yarn layer, so that the first surface 11 forms an insulation effect on the battery cells 20 inside the box body 10. When the temperature of the battery cells decreases, the first surface 11 with the woven glass fiber cloth layer and / or the glass fiber yarn layer can slow down the rate at which the temperature of the battery cells 20 decreases, thereby improving the charge and discharge rate and capacity retention rate of the battery cells 20 in a low temperature environment.

[0080] In some embodiments, the second surface 12 includes at least one of a glass fiber cloth layer and a glass fiber yarn layer, so that the second surface 12 forms an insulation effect on the battery cells 20 inside the box body 10. When the temperature of the battery cells decreases, the second surface 12 with the woven glass fiber cloth layer and / or the glass fiber yarn layer can slow down the rate at which the temperature of the battery cells 20 decreases, thereby improving the charge and discharge rate and capacity retention rate of the battery cells 20 in a low temperature environment.

[0081] On the other hand, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the aforementioned embodiments.

[0082] It can be understood that the electric device of the embodiment of the present application can have all the technical features and corresponding beneficial effects of the above-mentioned battery pack, which will not be elaborated here.

[0083] It should be noted that the electrical devices referred to in this application may include but are not limited to backup power supplies, electrodes, electric vehicles, electric bicycles, electric motorcycles, large batteries, etc.

[0084] 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 having a third direction (Z), characterized in that: The battery pack comprises: A box body (10) is provided with a receiving chamber (101) therein; A battery cell (20) is disposed in the accommodating cavity (101), wherein the battery cell (20) has a first wall (21) intersecting with the third direction (Z); A liquid cooling plate (30) is provided with a flow channel (301) for a heat transfer fluid to flow therein, the liquid cooling plate (30) comprising a first side wall (31) and a second side wall (32) arranged opposite to each other along the third direction (Z), the first side wall (31) abutting against the first wall (21), a first rib plate (33) being provided in the flow channel (301), and two ends of the first rib plate (33) being connected to the first side wall (31) and the second side wall (32) respectively along the third direction (Z); A support member (40) is arranged in the accommodating cavity (101), comprising a first support portion (41), a support cavity (410) being arranged inside the first support portion (41), the first support portion (41) comprising two end walls (411) arranged opposite to each other along the third direction (Z), one of the end walls (411) abutting against the second side wall (32), and the other end wall (411) being away from the second side wall (32), a second rib plate (412) being arranged in the support cavity (410), and two ends of the second rib plate (412) being respectively connected to the two end walls (411) along the third direction (Z); Along the third direction (Z), the plane on which the end wall (411) away from the second side wall (32) faces the liquid cooling plate (30) is located is a projection plane, and the orthographic projection of the first rib plate (33) on the projection plane and the orthographic projection of the second rib plate (412) on the projection plane at least partially do not overlap.

2. The battery pack according to claim 1, characterized in that: The battery pack also has a first direction (X) intersecting the third direction (Z); The first rib plate (33) is perpendicular to the first side wall (31) and the second side wall (32), respectively, and the second rib plate (412) is perpendicular to the two end walls (411), respectively; Along the first direction (X), the orthographic projection of the first rib plate (33) on the projection plane and the orthographic projection of the second rib plate (412) on the projection plane are both arranged at intervals; Along the third direction (Z), the distance between the two end walls (411) is greater than the thickness of one of the end walls (411).

3. The battery pack according to claim 1, wherein: The battery pack also has a first direction (X) intersecting the third direction (Z); The battery pack further comprises a protective layer (50), and the support member (40) further comprises a second support portion (42); The second supporting portion (42) is arranged on at least one side of the first supporting portion (41) in the first direction (X), and the second supporting portion (42) is connected to the first supporting portion (41) along the first direction (X); The second supporting portion (42) and the first wall (21) are arranged at intervals along the third direction (Z), and the protective layer (50) is arranged between the second supporting portion (42) and the first wall (21); the protective layer (50) is connected to both the second supporting portion (42) and the first wall (21).

4. The battery pack according to claim 3, characterized in that: The support member (40) comprises at least two first support portions (41), and the at least two first support portions (41) are arranged at intervals along the first direction (X); Along the first direction (X), one second supporting portion (42) is respectively provided on two opposite sides of the first supporting portion (41), and two adjacent first supporting portions (41) are connected via the second supporting portion (42).

5. The battery pack according to claim 4, characterized in that: The battery pack further comprises a buffer component (60), wherein a buffer cavity (601) is provided inside the buffer component (60); The box body (10) comprises a first surface (11) intersecting with the third direction (Z), a gap (420) exists between the second supporting portion (42) and the first surface (11), and the buffer member (60) is arranged in the gap (420); Along the third direction (Z), one end of the buffer member (60) adjacent to the second support portion (42) abuts against the second support portion (42), and one end of the buffer member (60) adjacent to the first surface (11) abuts against the first surface (11).

6. The battery pack according to claim 5, characterized in that: The battery pack further comprises a support bar (61), wherein the support bar (61) is arranged between the buffer component (60) and the second support portion (42); Along the third direction (Z), one end of the support bar (61) adjacent to the buffer member (60) abuts against the buffer member (60), and one end of the support bar (61) adjacent to the second support portion (42) abuts against the second support portion (42).

7. The battery pack according to claim 3, characterized in that: The box body (10) comprises a first surface (11) intersecting with the third direction (Z); Along the third direction (Z), the distance between the first surface (11) and the side of the first support portion (41) facing away from the first surface (11) is H1 mm, and the distance between the first surface (11) and the side of the second support portion (42) facing away from the first surface (11) is H2 mm, satisfying: H1<H2.

8. The battery pack according to claim 3, characterized in that: The support member (40) further comprises a reinforcing wall (43), wherein the reinforcing wall (43) is arranged on a side of the second supporting portion (42) away from the first supporting portion (41) in the first direction (X); The box body (10) comprises a first surface (11) intersecting with the third direction (Z); Along the third direction (Z), one end of the reinforcing wall (43) adjacent to the first surface (11) is connected to the second supporting portion (42), the distance between the end surface of the reinforcing wall (43) facing away from the first surface (11) and the first surface (11) is H3 mm, and the distance between the first wall (21) and the first surface is H4 mm, satisfying: H4<H3.

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises a side plate (70), a first adhesive layer (71) and a second adhesive layer (72); The side plate (70) is arranged in the accommodating cavity (101), a cavity (701) is arranged inside the side plate (70), the side plate (70) is arranged on a side of the reinforcing wall (43) away from the first supporting portion (41) in the first direction (X), the first adhesive layer (71) is arranged between the side plate (70) and the reinforcing wall (43), and the side plate (70) is adhesively connected to the reinforcing wall (43) via the first adhesive layer (71); The second adhesive layer (72) is arranged on a side of the first surface (11) facing the support member (40) in the third direction (Z), and the first support portion (41) is adhesively connected to the first surface (11) via the second adhesive layer (72).

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

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