Battery pack and electric device

Abstract

The embodiment of the invention relates to the technical field of batteries, and particularly discloses a battery pack and a power utilization device.The battery pack comprises a box body, the box body comprises a bottom plate, an edge beam, a first supporting part and a second supporting part, the edge beam is arranged around the edge of the bottom plate, and the bottom plate and the edge beam are matched to define a containing cavity; the first supporting part and the second supporting part are arranged in a protruding mode and connected to the side, close to the containing cavity, of the edge beam. The first battery assembly comprises a first bearing piece and a plurality of first single batteries; the second battery assembly comprises a second supporting piece and a plurality of second single batteries; the maximum size of the first supporting part in the first direction is H1mm, the maximum size of the second supporting part in the first direction is H2mm, and H1 is larger than H2. According to the invention, the assembly efficiency of the battery pack is improved, and the capacity of the battery pack is finally improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] The replacement of traditional fuel vehicles by new energy vehicles is of great significance to improving the energy and pollution problems faced by the global transportation industry, and it is also a general trend. With the rapid development of the new energy industry, battery packs with high capacity, high cycle life and high safety performance have been widely used and developed. At the same time, there is an urgent need for battery packs with larger capacity, longer durability and greater safety. The assembly efficiency of the battery pack directly affects the production capacity of the battery pack. Therefore, how to improve the assembly efficiency of the battery pack has become an urgent problem to be solved. Summary of the invention

[0003] Embodiments of the present application provide a battery pack and an electrical device to improve the assembly efficiency of the battery pack.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery pack is provided, having a first orientation, comprising:

[0006] The box body comprises: a bottom plate, a side beam, a first support portion and a second support portion, the side beam is arranged around the edge of the bottom plate, and the bottom plate and the side beam cooperate to enclose a receiving cavity, the first support portion and the second support portion are both protrudingly arranged and connected to a side of the side beam close to the receiving cavity, and the first support portion is arranged close to the bottom plate relative to the second support portion;

[0007] A first battery assembly is disposed in the accommodating cavity, the first battery assembly comprising: a first supporting member and a plurality of first single cells, the plurality of first single cells are disposed on a side of the first supporting member away from the bottom plate, and the first supporting member is connected to the first supporting portion; and

[0008] A second battery assembly is disposed in the accommodating cavity, the second battery assembly comprises: a second supporting member and a plurality of second single cells, the plurality of second single cells are disposed on a side of the second supporting member away from the bottom plate, and the second supporting member is connected to the second supporting portion;

[0009] The maximum dimension of the first support portion in the first direction is H1 mm, and the maximum dimension of the second support portion in the first direction is H2 mm, satisfying: H1>H2.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further has a second direction intersecting the first direction;

[0011] The second support portion includes: a first sub-support portion, the first sub-support portion extends along the second direction, and the first sub-support portion is protrudingly arranged and connected to a side of the side beam close to the accommodating cavity; and

[0012] The second sub-support part is connected to a side of the first sub-support part close to the accommodating cavity, and the second supporting member is connected to the second sub-support part.

[0013] In addition to one or more of the features disclosed above, or as an alternative, a plurality of second sub-support portions are provided, the plurality of second sub-support portions are all connected to a side of the first sub-support portion close to the accommodating cavity, and the plurality of second sub-support portions are spaced apart in the second direction, and the second supporting member is connected to the plurality of second sub-support portions.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further has a second direction intersecting the first direction;

[0015] The side beam comprises: a first beam, a second beam, a third beam, and a fourth beam connected to each other;

[0016] The first beam and the third beam both extend along the first direction, and the first beam and the third beam are spaced apart in the second direction; the second beam and the fourth beam both extend along the second direction, and the second beam and the fourth beam are spaced apart in the first direction;

[0017] A plurality of first supporting parts and a plurality of second supporting parts are provided, and the first supporting parts and the second supporting parts are connected to the second beam and the fourth beam, one first supporting part is connected to a side of the second beam close to the accommodation cavity, and another first supporting part is connected to a side of the fourth beam close to the accommodation cavity;

[0018] A second supporting portion is connected to a side of the second beam close to the accommodating cavity, and another second supporting portion is connected to a side of the fourth beam close to the accommodating cavity.

[0019] In addition to or as an alternative to one or more of the features disclosed above, a first fixing hole is provided on the first support portion;

[0020] The battery pack also includes: a first fixing member, which is arranged on the first supporting member, and the first fixing member is passed through the first fixing hole to be fixedly connected with the first supporting portion to position and fix the first supporting member.

[0021] In addition to or as an alternative to one or more of the features disclosed above, the first supporting member has a heat-melting portion on a side away from the first single battery, and the heat-melting portion is fixed to the bottom plate by heat-melting.

[0022] In addition to or as an alternative to one or more of the features disclosed above, a fixing groove is provided on the second sub-support portion, and a second fixing hole is provided on the second supporting member;

[0023] The battery pack further includes: a second fixing member disposed in the fixing groove, and a third fixing hole is formed on the second fixing member; and

[0024] The rivet member is inserted into the second fixing hole and the third fixing hole to be fixedly connected with the second fixing member so as to position and fix the second supporting member.

[0025] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further has a third direction intersecting the first direction and the second direction in pairs;

[0026] A limiting wall is provided on one side of the second sub-support portion away from the first support portion, and the limiting wall is located in the circumferential area of ​​the fixing groove;

[0027] The second fixing member includes: two first side walls arranged opposite to each other in the second direction, and a second side wall and a third side wall arranged opposite to each other in the third direction, the second side wall is arranged relative to the third side wall and close to the limiting wall, the first side wall, the second side wall and the third side wall are enclosed to form a riveting cavity, the third fixing hole is opened on the second side wall, and the third fixing hole is connected to the riveting cavity;

[0028] The rivet member is passed through the second fixing hole and the third fixing hole so that part of the rivet member is located in the rivet cavity and is riveted to the second side wall so that the second side wall abuts against the limiting wall and the second supporting member is positioned and fixed.

[0029] In addition to or as an alternative to one or more of the features disclosed above, the first support member has a first lifting ring portion, and the first lifting ring portion is used to load the first battery assembly into the accommodating cavity;

[0030] The second supporting member has a second hanging ring portion, and the second hanging ring portion is used to load the second battery assembly into the accommodating cavity.

[0031] In addition to or as an alternative to one or more of the features disclosed above, the bottom plate and the side beams are welded and fixed to each other.

[0032] On the other hand, an electrical device is further disclosed. In addition to or instead of one or more of the features disclosed above, the electrical device includes a battery pack as described in any one of the above items, and the battery pack serves as a power supply for the electrical device.

[0033] One of the above technical solutions has the following advantages or beneficial effects: the present application arranges a first support portion and a second support portion on the box body, and the first supporting member is connected to the first support portion, and the second supporting member is connected to the second support portion, so as to utilize the first support portion to support and fix the first battery assembly, thereby increasing the convenience of connecting the first battery assembly to the side beam of the box body, and avoiding the first battery assembly being directly connected to the side beam of the box body to affect the overall sealing of the box body; utilizes the second support portion to support and fix the second battery assembly, thereby increasing the convenience of connecting the second battery assembly to the side beam of the box body, and avoiding the second battery assembly being directly connected to the bottom plate of the box body to affect the overall sealing of the box body, so as to ensure the overall sealing of the box body, and then ensure the overall sealing performance of the battery pack, so as to reduce the impact of external components on the components in the battery pack, extend the service life of the components in the battery pack, extend the service life of the battery pack, and ultimately improve the safety performance of the battery pack.

[0034] At the same time, the present application limits the maximum dimension H1 mm of the first support portion in the first direction to be greater than the maximum dimension H2 mm of the second support portion in the first direction X, so that the first battery assembly and the second battery assembly can be placed into the box through the opening of the box, so as to facilitate the rapid assembly of the first battery assembly and the second battery assembly to the box, thereby improving the assembly efficiency of the battery pack and ultimately improving the production capacity of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0036] Figure 1 is an exploded structural view of a battery pack provided according to an embodiment of the present application;

[0037] Figure 2 is a top view of a battery pack provided according to an embodiment of the present application;

[0038] Figure 3 is a cross-sectional view of a battery pack along the AA direction provided in an embodiment of the present application;

[0039] Figure 4 is a three-dimensional structural view of a box provided according to an embodiment of the present application;

[0040] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0041] Figure 6 is a top view of a box provided according to an embodiment of the present application;

[0042] Figure 7 is a cross-sectional view of a box body along the BB direction provided by an embodiment of the present application;

[0043] Figure 8 is a schematic structural diagram of a first battery assembly, a second battery assembly and a second beam provided according to an embodiment of the present application;

[0044] Fig. 9 is a schematic diagram of the structure of a second beam provided according to an embodiment of the present application;

[0045] Fig.10 is a three-dimensional structural view of a first battery assembly provided according to an embodiment of the present application;

[0046] Fig.11 is a three-dimensional structural view from another perspective of the first battery assembly provided in an embodiment of the present application;

[0047] Fig.12 is a three-dimensional structural view of a second battery assembly provided according to an embodiment of the present application;

[0048] Fig.13 It is a top view of a second battery assembly provided according to an embodiment of the present application.

[0049] Description of reference numerals:

[0050] 100. Battery pack;

[0051] 110, box body; 111, bottom plate; 112, side beam; 1121, first beam; 1122, second beam; 1123, third beam; 1124, fourth beam; 113, first support portion; 1131, first fixing hole; 114, second support portion; 1141, first sub-support portion; 1142, second sub-support portion; 1143, fixing groove; 1144, limiting wall; 115, accommodating cavity;

[0052] 120, first battery assembly; 121, first supporting member; 1211, hot-melt portion; 1212, first hanging ring portion; 122, first single battery;

[0053] 130, second battery assembly; 131, second supporting member; 1311, second fixing hole; 1312, second hanging ring; 132, second single battery;

[0054] 140, a first fixing member;

[0055] 150, second fixing member; 151, third fixing hole; 152, first side wall; 153, second side wall; 154, third side wall; 155, riveting cavity;

[0056] 160. Riveted parts;

[0057] 170. Box cover. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] When assembling a double-layer battery pack in the prior art, the battery pack of the lower layer is loaded into the box from bottom to top through the lower opening of the box (at this time, the box has no bottom plate and has openings on both the upper and lower sides), and the battery pack of the upper layer is loaded into the box from top to bottom through the upper opening of the box, resulting in a complicated overall assembly process of the battery pack, low overall assembly efficiency of the battery pack, and low production capacity of the battery pack; at the same time, the box and the bottom plate can only be fixed by screws, resulting in the bottom of the box can only be sealed and fixed by a combination of bottom plate, screws and foam, resulting in the overall sealing of the battery pack being prone to poor, and the connection strength between the box and the bottom plate is low, affecting the safety performance of the battery pack.

[0063] In order to solve the above problems, in the embodiments of the present application, refer to Figures 1 to 13 The present application provides a battery pack 100, which has a first direction X, a second direction Y and a third direction Z that intersect each other. Exemplarily, the battery pack 100 has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other. Here, "perpendicular" refers to a state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0064] Specifically, the battery pack 100 includes a box body 110 , a first battery assembly 120 , a second battery assembly 130 and a box cover 170 .

[0065] The box body 110 includes: a bottom plate 111, a side beam 112, a first support portion 113 and a second support portion 114. The side beam 112 is arranged around the edge of the bottom plate 111, and the bottom plate 111 and the side beam 112 cooperate to enclose a accommodating cavity 115. The first support portion 113 and the second support portion 114 are both protrudingly arranged and connected to a side of the side beam 112 close to the accommodating cavity 115, and the first support portion 113 is arranged close to the bottom plate 111 relative to the second support portion 114.

[0066] The first battery assembly 120 is disposed in the accommodating cavity 115 , and includes a first supporting member 121 and a plurality of first single cells 122 . The plurality of first single cells 122 are disposed on a side of the first supporting member 121 away from the bottom plate 111 , and the first supporting member 121 is connected to the first supporting portion 113 .

[0067] The second battery assembly 130 is disposed in the accommodating cavity 115 , and includes a second supporting member 131 and a plurality of second single cells 132 . The plurality of second single cells 132 are disposed on a side of the second supporting member 131 away from the bottom plate 111 , and the second supporting member 131 is connected to the second supporting portion 114 .

[0068] The box cover 170 is connected to the box body 110 to seal the box body 110 .

[0069] The battery pack 100 may be a battery pack 100 with three layers of single cell-battery module-battery pack, that is, the first single cell 122 and the second single cell 132 are first grouped into a battery module, and then the battery module is placed in the box 110 to form the battery pack 100; it may also be a battery pack 100 with two layers of single cell-battery pack, that is, the first single cell 122 and the second single cell 132 are directly placed in the box 110 to form a battery pack. This is not specifically limited in the present application, and can be specifically set according to the actual situation, as long as it does not affect the effect of the present application.

[0070] The bottom plate 111 and the side beams 112 are both made of common steel or aluminum, but are not limited thereto.

[0071] The box cover 170 is made of metal material, but is not limited thereto.

[0072] In one embodiment, the bottom plate 111 and the side beams 112 are welded and fixed to ensure the overall sealing performance of the box body 110 .

[0073] The side beam 112 and the first support portion 113, the side beam 112 and the second support portion 114 can be integrally formed, that is, the side beam 112, the first support portion 113 and the second support portion 114 are an integral structure, and exemplarily, the side beam 112 and the first support portion 113, the side beam 112 and the second support portion 114 are integrally die-cast; the side beam 112 and the first support portion 113, the side beam 112 and the second support portion 114 can also be separately arranged, and the two are fixedly connected, and exemplarily, the first support portion 113 and the second support portion 114 are respectively fixedly connected to the side beam 112 by welding. This application does not make specific restrictions, and can be specifically set according to actual circumstances.

[0074] The first single cell 122 and the second single cell 132 may be secondary batteries, which refer to single cells that can be continuously used by activating active materials by charging after the single cell is discharged. Exemplarily, the first single cell 122 and the second single cell 132 may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, or nickel-cadmium batteries, but are not limited thereto.

[0075] The first single battery 122 and the second single battery 132 may be prismatic batteries, soft-pack batteries, or batteries of other shapes. For example, in the present application, the first single battery 122 and the second single battery 132 are cylindrical batteries.

[0076] The first single cell 122 and the second single cell 132 each include an electrode assembly, an electrolyte, a shell, an end cap, a pole and other functional components. The electrolyte may be a conventional electrolyte or a special electrolyte with additives added thereto, and the electrolyte is used to soak the electrode assembly. The electrode assembly is a component in which an electrochemical reaction occurs in the first single cell 122 and the second single cell 132, and the electrode assembly may be one or more. The electrode assembly is mainly formed by stacking or winding a positive electrode sheet, a diaphragm and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. During the charge and discharge process of the first single cell 122 and the second single cell 132, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear is electrically connected to the pole to form a current loop, so that the first single cell 122 and the second single cell 132 can be used normally.

[0077] It can be understood that the present application provides a first support portion 113 and a second support portion 114 on the box body 110, and the first supporting member 121 is connected to the first supporting member 113, and the second supporting member 131 is connected to the second supporting member 114, so as to use the first supporting member 113 to support and fix the first battery assembly 120, thereby increasing the convenience of connecting the first battery assembly 120 with the side beam 112 of the box body 110, and avoiding the first battery assembly 120 being directly connected to the side beam 112 of the box body 110 to affect the overall sealing of the box body 110; using the second supporting member 114 to support and fix the first battery assembly 120 The second battery assembly 130 is supported and fixed, which increases the convenience of connecting the second battery assembly 130 with the side beam 112 of the box body 110, and avoids the second battery assembly 130 being directly connected to the bottom plate 111 of the box body 110 to affect the overall sealing of the box body 110, so as to ensure the overall sealing of the box body 110, and then ensure the overall sealing performance of the battery pack 100, so as to reduce the impact of external components on the components in the battery pack 100, extend the service life of the components in the battery pack 100, extend the service life of the battery pack 100, and finally improve the safety performance of the battery pack 100.

[0078] At the same time, in the present application, the bottom plate 111 and the side beam 112 are welded and fixed to ensure the connection strength between the bottom plate 111 and the side beam 112, and at the same time, ensure the overall sealing of the box body 110, and then ensure the overall sealing performance of the battery pack 100, so as to reduce the impact of external components on the components in the battery pack 100, extend the service life of the components in the battery pack 100, extend the service life of the battery pack 100, and ultimately improve the safety performance of the battery pack 100.

[0079] Specifically, refer to Figures 4 to 7, the maximum dimension of the first support portion 113 in the first direction X is H1 mm, and the maximum dimension of the second support portion 114 in the first direction X is H2 mm, satisfying: H1>H2, that is, the maximum dimension H1 mm of the first support portion 113 in the first direction X is greater than the maximum dimension H2 mm of the second support portion 114 in the first direction X, so that the first battery assembly 120 and the second battery assembly 130 can only pass through the open part of the box body 110 ( Figure 1 The first battery assembly 120 and the second battery assembly 130 are placed in the box body 110 so as to quickly assemble the first battery assembly 120 and the second battery assembly 130 into the box body 110, thereby improving the assembly efficiency of the battery pack 100 and ultimately improving the production capacity of the battery pack.

[0080] The maximum dimension H1 mm of the first support portion 113 in the first direction X can be obtained by disassembling the actual battery pack 100, measuring the distance between the side wall of the side beam 112 on the box body 110 close to the accommodating cavity 115 and the side wall of the first support portion 113 away from the side beam 112 for multiple times using a measuring tool, and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper, or other dimension measuring instruments, but is not limited thereto.

[0081] The maximum dimension H2 mm of the second support portion 114 in the first direction X can be obtained by disassembling the actual battery pack 100, measuring the distance between the side wall of the side beam 112 on the box body 110 close to the accommodating cavity 115 and the side wall of the second support portion 114 away from the side beam 112 for multiple times by using a measuring tool, and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper, or other dimension measuring instruments, but is not limited thereto.

[0082] In one embodiment, referring to Figures 4 to 7 , the maximum dimension H1 mm of the first support portion 113 in the first direction X and the maximum dimension H2 mm of the second support portion 114 in the first direction X also satisfy: 0.155≤H2 / H1≤0.5. That is, the ratio of the maximum dimension H2 mm of the second support portion 114 in the first direction X to the maximum dimension H1 mm of the first support portion 113 in the first direction X can be controlled within the range of 0.155 to 0.5. Exemplarily, H2 / H1 can be a range consisting of one of 0.155, 0.2, 0.255, 0.3, 0.355, 0.4, 0.455 or 0.5 or any two of them. The above specific values ​​of H2 / H1 are given for example only, and any value within the range of 0.155 to 0.5 is within the protection scope of the present application.

[0083] The present application limits the ratio of the maximum dimension H2 mm of the second support portion 114 in the first direction X to the maximum dimension H1 mm of the first support portion 113 in the first direction X within the range of 0.155 to 0.5, so as to reasonably design the structural dimensions of the first support portion 113 and the second support portion 114, thereby ensuring that the first support portion 113 can stably support and fix the first battery assembly 120, and the second support portion 114 can support and fix the second battery assembly 130, thereby ensuring the overall structural stability of the battery pack 100, ensuring the normal use of the battery pack 100, and ensuring the safety performance of the battery pack 100; at the same time, reducing the space occupied by the first support portion 113 and the second support portion 114 in the accommodating cavity 115, increasing the space occupancy rate of the first single battery 122 and the second single battery 132 in the box 110 of the battery pack 100, and ultimately improving the volume energy density of the battery pack 100.

[0084] In one embodiment, the maximum dimension H1 mm of the first support portion 113 in the first direction X also satisfies: 16 mm ≤ H1 ≤ 51.5 mm. That is, the maximum dimension H1 mm of the first support portion 113 in the first direction X can be controlled within the range of 16 mm to 51.5 mm. Exemplarily, H1 mm can be one of 16 mm, 20 mm, 24 mm, 28 mm, 30 mm, 32 mm, 36 mm, 40 mm, 44 mm, 47.5 mm, 48 mm, 48.5 mm, 49.5 mm, 50 mm, 50.5 mm or 51.5 mm, or a range consisting of any two of them. The above specific values ​​of H1 mm are given for example only, and any value within the range of 16 mm to 51.5 mm is within the protection scope of the present application.

[0085] The present application limits the maximum dimension H1 mm of the first support portion 113 in the first direction X to be within the range of 16 mm to 51.5 mm, so as to further reasonably design the structural dimensions of the first support portion 113, ensure that the first support portion 113 can stably support and fix the first battery assembly 120, further ensure the overall structural stability of the battery pack 100, and ensure the normal use of the battery pack 100; at the same time, reduce the space occupied by the first support portion 113 in the accommodating cavity 115, increase the space occupancy rate of the first single battery 122 and the second single battery 132 in the box 110 of the battery pack 100, and ultimately improve the volume energy density of the battery pack 100.

[0086] The maximum dimension H2 mm of the second support portion 114 in the first direction X also satisfies: 8 mm ≤ H2 ≤ 17 mm. That is, the maximum dimension H2 mm of the second support portion 114 in the first direction X can be controlled within the range of 8 mm to 17 mm. Exemplarily, H2 mm can be one of 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm or 17 mm, or a range consisting of any two of them. The above specific values ​​of H2 mm are given for example only, and any value within the range of 8 mm to 17 mm is within the protection scope of the present application.

[0087] The present application limits the maximum dimension H2 mm of the second support portion 114 in the first direction X to be within the range of 8 mm to 17 mm, so as to further reasonably design the structural dimensions of the second support portion 114, ensure that the second support portion 114 can support and fix the second battery assembly 130, further ensure the overall structural stability of the battery pack 100, and ensure the normal use of the battery pack 100; at the same time, reduce the space occupied by the second support portion 114 in the accommodating cavity 115, increase the space occupancy rate of the first single battery 122 and the second single battery 132 in the box 110 of the battery pack 100, and ultimately improve the volume energy density of the battery pack 100.

[0088] In one embodiment, referring to Figures 4 to 5 The second support portion 114 includes: a first sub-support portion 1141 and a second sub-support portion 1142, the first sub-support portion 1141 extends along the second direction Y, and the first sub-support portion 1141 is protrudingly arranged and connected to a side of the side beam 112 close to the accommodating cavity 115; the second sub-support portion 1142 is connected to a side of the first sub-support portion 1141 close to the accommodating cavity 115, and the second supporting member 131 is connected to the second sub-support portion 1142.

[0089] Among them, the first sub-support portion 1141 and the second sub-support portion 1142 can be integrally formed, that is, the first sub-support portion 1141 and the second sub-support portion 1142 are an integral structure, and the first sub-support portion 1141 and the second sub-support portion 1142 are exemplarily integrally die-cast; the first sub-support portion 1141 and the second sub-support portion 1142 can also be separately provided, and the two are fixedly connected, and exemplarily, the second sub-support portion 1142 is fixedly connected to the first sub-support portion 1141 by a welding process. This is not specifically limited in this application, and can be specifically set according to actual circumstances. Exemplarily, in this application, the first sub-support portion 1141 and the second sub-support portion 1142 are integrally formed to facilitate the processing and forming of the box body 110.

[0090] It can be understood that the present application connects the second supporting member 131 to the second sub-support portion 1142 to facilitate the connection and fixation of the second supporting member 131, thereby facilitating the limiting and fixation of the second battery assembly 130, thereby ensuring the overall structural stability of the battery pack 100 and ensuring the normal use of the battery pack 100.

[0091] In one embodiment, referring to Figures 4 to 5 A plurality of second sub-support portions 1142 are provided, and the plurality of second sub-support portions 1142 are all connected to the side of the first sub-support portion 1141 close to the accommodating cavity 115, and the plurality of second sub-support portions 1142 are spaced apart in the second direction Y, and the second supporting member 131 is connected to the plurality of second sub-support portions 1142 to ensure the connection stability of the second supporting member 131, thereby ensuring the connection stability of the second battery assembly 130, ensuring the overall structural stability of the battery pack 100, and ensuring the normal use of the battery pack 100.

[0092] In one embodiment, referring to Figures 4 to 7 The side beam 112 includes: a first beam 1121, a second beam 1122, a third beam 1123, and a fourth beam 1124 that are connected to each other; the first beam 1121 and the third beam 1123 both extend along the first direction X, and the first beam 1121 and the third beam 1123 are spaced apart in the second direction Y; the second beam 1122 and the fourth beam 1124 both extend along the second direction Y, and the second beam 1122 and the fourth beam 1124 are spaced apart in the first direction X.

[0093] Multiple first support parts 113 and second support parts 114 are provided, and the second beam 1122 and the fourth beam 1124 are connected with the first support parts 113 and the second support parts 114. One first support part 113 is connected to the side of the second beam 1122 close to the accommodating cavity 115, and the other first support part 113 is connected to the side of the fourth beam 1124 close to the accommodating cavity 115, so as to ensure that the two first support parts 113 are arranged relative to each other, thereby ensuring that the two first support parts 113 can flatly support and fix the first battery assembly 120, thereby ensuring the structural stability of the first battery assembly 120, ensuring the overall structural stability of the battery pack 100, and ensuring the normal use of the battery pack 100.

[0094] A second support portion 114 is connected to a side of the second beam 1122 close to the accommodating cavity 115, and another second support portion 114 is connected to a side of the fourth beam 1124 close to the accommodating cavity 115, so as to ensure that the two second support portions 114 are arranged relative to each other, thereby ensuring that the two second support portions 114 can flatly support and fix the second battery assembly 130, thereby ensuring the structural stability of the second battery assembly 130, ensuring the overall structural stability of the battery pack 100, and ensuring the normal use of the battery pack 100.

[0095] In one embodiment, in order to ensure the structural stability of the first battery assembly 120 in the battery pack 100, in this application, reference is made to Figures 8 to 11 The first supporting portion 113 defines a first fixing hole 1131 .

[0096] Specifically, the battery pack 100 also includes: a first fixing member 140, the first fixing member 140 is arranged on the first supporting member 121, and the first fixing member 140 is passed through the first fixing hole 1131 to be fixedly connected to the first support portion 113, so as to position and fix the first supporting member 121, thereby connecting and fixing the first battery assembly 120, so as to ensure the structural stability of the first battery assembly 120, ensure the overall structural stability of the battery pack 100, and ensure the normal use of the battery pack 100.

[0097] Illustratively, in the present application, the first fixing hole 1131 is a threaded hole, and the first fixing member 140 is a bolt, so that the first fixing member 140 is threadedly connected to the first support portion 113 to connect and fix the first battery assembly 120 .

[0098] In one embodiment, in order to further ensure the structural stability of the first battery assembly 120 in the battery pack 100, in this application, reference is made to Figures 8 to 11 The first supporting member 121 has a hot-melt portion 1211 on one side away from the first single battery 122, and the hot-melt portion 1211 is fixed to the bottom plate 111 by hot-melt, so as to further connect and fix the first supporting member 121, further ensure the structural stability of the first battery assembly 120, ensure the overall structural stability of the battery pack 100, and ensure the normal use of the battery pack 100.

[0099] In one embodiment, in order to ensure the structural stability of the second battery assembly 130 in the battery pack 100, in the present application, reference is made to Figures 8 to 9 , Figure 12 to Figure 13 A fixing groove 1143 is defined on the second sub-support portion 1142 , and a second fixing hole 1311 is defined on the second supporting member 131 .

[0100] Specifically, the battery pack 100 also includes: a second fixing member 150 and a rivet member 160, the second fixing member 150 is arranged in the fixing groove 1143, and a third fixing hole 151 is opened on the second fixing member 150; the rivet member 160 is passed through the second fixing hole 1311 and the third fixing hole 151 to be fixedly connected with the second fixing member 150 to position and fix the second supporting member 131.

[0101] The rivet 160 may be a rivet stud, but is not limited thereto.

[0102] It can be understood that since the maximum dimension H1 mm of the first support portion 113 in the first direction X is greater than the maximum dimension H2 mm of the second support portion 114 in the first direction X, the maximum dimension H2 mm of the second support portion 114 in the first direction X is smaller, which makes it inconvenient to process a conventional fixing structure on the second support portion 114, and thus it is inconvenient to connect and fix the second battery assembly 130.

[0103] Therefore, in the present application, by providing a fixing groove 1143 on the second sub-support portion 1142, by embedding the second fixing member 150 in the fixing groove 1143, and by riveting the second fixing member 150, the second sub-support portion 1142, and the second supporting member 131 with the rivet 160, the second supporting member 131 is positioned and fixed, thereby positioning and fixing the second battery assembly 130, ensuring the structural stability of the second battery assembly 130, ensuring the overall structural stability of the battery pack 100, and ensuring the normal use of the battery pack 100. In this way, the internal effective space of the battery pack 100 can be increased as much as possible (that is, as much space as possible is given to the single battery) when the battery pack space is limited. That is to say, on the basis of the relatively small size of the second sub-support portion 1142 along the first direction X, the fixing groove 1143 on the second sub-support portion 1142, the second fixing member 150, and the rivet 160 can also be used to achieve a relatively convenient positioning and fixing of the second supporting member 131. The overall structural stability of the battery pack 100 is ensured, and the normal use of the battery pack 100 is ensured.

[0104] In one embodiment, the fixing groove 1143 is open toward one side of the single battery (in the prior art, screws alone cannot effectively fix and cannot ensure good connection stability of the second supporting member 131). In this way, the second sub-supporting part 1142 has a smaller size along the first direction X, and the fixing groove 1143 on the second sub-supporting part 1142 and the second fixing member 150 and the rivet 160 can be used to achieve more convenient positioning and fixing of the second supporting member 131. The overall structural stability of the battery pack 100 is ensured, and the normal use of the battery pack 100 is ensured.

[0105] In one embodiment, referring to Figures 8 to 9 , Figure 12 to Figure 13 A limiting wall 1144 is provided on a side of the second sub-support portion 1142 away from the first support portion 113 , and the limiting wall 1144 is located in a circumferential area of ​​the fixing groove 1143 .

[0106] Specifically, the second fixing member 150 includes: two first side walls 152 arranged opposite to each other in the second direction Y, and a second side wall 153 and a third side wall 154 arranged opposite to each other in the third direction Z, the second side wall 153 is arranged opposite to the third side wall 154 and close to the limiting wall 1144, the first side wall 152, the second side wall 153 and the third side wall 154 are surrounded to form a riveting cavity 155, the third fixing hole 151 is opened on the second side wall 153, and the third fixing hole 151 is communicated with the riveting cavity 155;

[0107] The rivet 160 is passed through the second fixing hole 1311 and the third fixing hole 151 to locate a portion of the rivet 160 in the riveting cavity 155 and rivet with the second side wall 153 to abut the second side wall 153 against the limiting wall 1144 to position and fix the second supporting member 131 .

[0108] It can be understood that in the present application, a limiting wall 1144 is provided on the second sub-support portion 1142, so that when the rivet 160 rivets and fixes the second fixing member 150, the second sub-support portion 1142, and the second supporting member 131, the second side wall 153 of the second fixing member 150 abuts against the limiting wall 1144 to achieve positioning and fixing of the second supporting member 131, thereby positioning and fixing the second battery assembly 130, ensuring the structural stability of the second battery assembly 130, ensuring the overall structural stability of the battery pack 100, and ensuring the normal use of the battery pack 100.

[0109] In one embodiment, the second fixing member 150 is welded and fixed to the second sub-support portion 1142 to ensure that the second fixing member 150 is firmly connected, thereby further ensuring the stability of the connection and fixation of the second battery assembly 130, and further ensuring the overall structural stability of the battery pack 100.

[0110] In one embodiment, in order to facilitate the assembly of the first battery assembly 120 and the second battery assembly 130 into the box, in this application, reference is made to Figures 10 to 13 The first supporting member 121 has a first hanging ring portion 1212, and the first hanging ring portion 1212 is used to load the first battery assembly 120 into the accommodating cavity 115; the second supporting member 131 has a second hanging ring portion 1312, and the second hanging ring portion 1312 is used to load the second battery assembly 130 into the accommodating cavity 115.

[0111] The first hanging ring 1212 and the first supporting member 121 can be integrally formed, that is, the first hanging ring 1212 and the first supporting member 121 are an integral structure; the first hanging ring 1212 and the first supporting member 121 can also be separately provided, and the two are fixedly connected, and illustratively, the first hanging ring 1212 is fixedly connected to the first supporting member 121 by an adhesive process. This is not specifically limited in the present application, and can be specifically set according to actual circumstances.

[0112] The second hanging ring 1312 and the second supporting member 131 can be integrally formed, that is, the second hanging ring 1312 and the second supporting member 131 are an integral structure; the second hanging ring 1312 and the second supporting member 131 can also be separately provided, and the two are fixedly connected, and illustratively, the second hanging ring 1312 is fixedly connected to the second supporting member 131 by an adhesive process. This is not specifically limited in the present application, and can be specifically provided according to actual circumstances.

[0113] In the present application, a first hanging ring portion 1212 is provided on the first supporting member 121 so as to assemble the first battery assembly 120 into the accommodating cavity 115 by utilizing the first hanging ring portion 1212, and a second hanging ring portion 1312 is provided on the second supporting member 131 so as to assemble the second battery assembly 130 into the accommodating cavity 115 by utilizing the second hanging ring portion 1312, so as to facilitate the assembly of the first battery assembly 120 and the second battery assembly 130 into the box body 110, thereby further improving the assembly efficiency of the battery pack 100.

[0114] On the other hand, in an embodiment of the present application, the present application further provides an electrical device, including: a battery pack 100 as described in any of the above embodiments, the battery pack 100 serves as a power supply for the electrical device to ensure normal operation of the electrical device.

[0115] Among them, electrical devices may be, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0116] In order to better understand the technical solution of the present application, a lithium-ion battery pack is taken as an example for further explanation below.

[0117] Example 1

[0118] This embodiment provides a method for preparing a lithium-ion battery pack, and the specific process is as follows:

[0119] 1. Preparation of positive electrode

[0120] The positive electrode active material is lithium iron phosphate, the conductive agent is conductive carbon black (SP), and the binder is polyvinylidene fluoride (PVDF) in a mass ratio of 96:2:2, and then N-methylpyrrolidone (NMP) is added as a solvent for mixing, and stirred under vacuum until the system becomes uniform to obtain a positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the positive electrode current collector aluminum foil, and then transferred to a 120°C oven for drying, and then rolled, slit, and cut into pieces to obtain a positive electrode sheet.

[0121] 2. Preparation of negative electrode sheet

[0122] The negative electrode active material graphite, the conductive agent conductive carbon black (SP), the thickener sodium carboxymethyl cellulose (CMC), and the binder styrene butadiene rubber (SBR) are mixed in a mass ratio of 96.2:1.2:1.2:1.4, and then deionized water is added as a solvent for mixing, and stirred under vacuum until the system becomes uniform to obtain a negative electrode slurry; the negative electrode slurry is evenly coated on both sides of the negative electrode collector copper foil, and then transferred to a 110°C oven for drying, and then rolled, slit, and cut to obtain a negative electrode sheet.

[0123] 3. Preparation of electrolyte

[0124] Ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) were mixed in a mass ratio of 3:4:3 to obtain an organic solvent, 1 mQl / L of LiPF6 was added and mixed evenly, and then vinylene carbonate, vinyl sulfate and lithium difluorophosphate were added to prepare an electrolyte.

[0125] 4. Preparation of diaphragm

[0126] PP film is used as the separator.

[0127] 5. Preparation of lithium-ion batteries

[0128] The negative electrode sheet and the positive electrode sheet prepared by the above steps are dried and then used together with the separator to prepare a wound electrode roll using a winding machine. The positive electrode tab and the negative electrode tab are welded to the end cover, and the welded electrode assembly with the top cover is placed in an aluminum shell for packaging; the lithium-ion battery is obtained by injecting electrolyte and forming a constant capacity.

[0129] 6. Preparation of lithium-ion battery pack

[0130] The lithium-ion battery is assembled in the box body, and the box cover is closed to obtain a lithium-ion battery pack.

[0131] The maximum dimension H1 mm of the first support portion 113 in the first direction X is 51.5 mm, the maximum dimension H2 mm of the second support portion 114 in the first direction X is 8 mm, and H2 / H1 is 0.155.

[0132] Among them, Examples 2 to 18 in Table 1 are all prepared according to the method of Example 1 for lithium-ion battery packs, and the differences between Examples 2 to 18 and Example 1 are: changes in the values ​​of H1, H2 and H2 / H1.

[0133] Embodiment 19

[0134] A lithium-ion battery pack was prepared according to the method of Example 1, except that:

[0135] The maximum dimension H1 mm of the first support portion 113 in the first direction X is 12 mm, the maximum dimension H2 mm of the second support portion 114 in the first direction X is 7 mm, and H2 / H1 is 0.583.

[0136] Embodiment 20

[0137] A lithium-ion battery pack was prepared according to the method of Example 1, except that:

[0138] The maximum dimension H1 mm of the first support portion 113 in the first direction X is 55 mm, the maximum dimension H2 mm of the second support portion 114 in the first direction X is 6 mm, and H2 / H1 is 0.109.

[0139] The battery packs prepared in the above embodiments and comparative examples were subjected to performance tests, and the specific test items were tested as follows:

[0140] 1. Test method for structural stability of lithium-ion battery pack

[0141] At 25°C, let the lithium-ion battery pack stand for 30 minutes, fix the battery pack on a vibration table, vibrate with a sine wave, and sweep the frequency from 10Hz to 55Hz and back to 7Hz within 15 minutes in a logarithmic sweep mode. The vibration is carried out in three directions perpendicular to the sample, and the above-mentioned logarithmic sweep method is repeated 12 times in each direction. The vibration is carried out for 90 minutes to observe whether the appearance structure of the battery pack is intact, whether there is leakage or rupture, and whether there is fire, explosion or leakage. Among them, if the appearance structure of the battery pack is intact, there is no leakage or rupture, and there is no fire, explosion or leakage, then the structural stability of the battery pack is excellent. Otherwise, the structural stability of the battery pack is poor.

[0142] 2. Test method for volume energy density of lithium-ion battery pack:

[0143] At 25°C, let the lithium-ion battery pack stand for 30 minutes, charge to the cut-off voltage with a current of 1C, let it stand for 30 minutes, and then discharge to the cut-off voltage with a current of 1C, and record the actual discharge energy; use a measuring tool to measure the available volume in the battery pack box; the ratio of 1C actual discharge energy to the available volume is the actual volume energy density of the lithium-ion battery pack.

[0144] Table 1 shows the influence of the parameter relationship between the maximum dimension H1 mm of the first support portion 113 in the first direction X and the maximum dimension H2 mm of the second support portion 114 in the first direction X on the lithium-ion battery.

[0145] Table 1 Parameters and test results of Examples 1 to 14

[0146] <![CDATA[H1 / mm]]> <![CDATA[H2 / mm]]> <![CDATA[H2 / H1]]> Structural stability Volumetric energy density (Wh / L) Example 1 51.5 8 0.155 Excellent 50 Example 2 50 8 0.16 Excellent 52 Example 3 40 8 0.2 Excellent 55 Example 4 30 8 0.267 Excellent 65 Example 5 20 8 0.4 Excellent 68 Example 6 16 8 0.5 Excellent 70 Example 7 51.5 10 0.194 Excellent 68 Example 8 51.5 12 0.233 Excellent 66 Example 9 51.5 14 0.272 Excellent 63 Example 10 51.5 15 0.291 Excellent 53 Embodiment 11 51.5 16 0.311 Excellent 50 Example 12 51.5 17 0.33 Excellent 48 Example 13 47.5 17 0.358 Excellent 66 Embodiment 14 48.5 16 0.33 Excellent 65 Embodiment 15 49.5 15 0.303 Excellent 64 Example 16 50.5 14 0.277 Excellent 60 Embodiment 17 50 10 0.2 Excellent 59 Embodiment 18 51.5 8 0.155 Excellent 50 Embodiment 19 12 7 0.583 Difference 40 Embodiment 20 55 6 0.109 Difference 45

[0147] It can be seen from the data in Table 1 that in Examples 19 to 20, the lithium-ion battery pack did not show corresponding performance and did not meet the requirements.

[0148] It can be seen that the present application limits the maximum dimension H2 mm of the second support portion 114 in the first direction X to the maximum dimension H1 mm of the first support portion 113 in the first direction X within the range of 0.155 to 0.5, limits the maximum dimension H1 mm of the first support portion 113 in the first direction X within the range of 16 mm to 51.5 mm, limits the maximum dimension H2 mm of the second support portion 114 in the first direction X to The first support portion 113 and the second support portion 114 are reasonably designed to have structural dimensions within the range of 8 mm to 17 mm, to ensure that the first support portion 113 can stably support and fix the first battery assembly 120, and the second support portion 114 can support and fix the second battery assembly 130, thereby ensuring the overall structural stability of the battery pack 100, ensuring the normal use of the battery pack 100, and ensuring the safety performance of the battery pack 100; at the same time, reducing the space occupied by the first support portion 113 and the second support portion 114 in the accommodating cavity 115, increasing the space occupancy rate of the first single battery 122 and the second single battery 132 in the box 110 of the battery pack 100, and ultimately increasing the volume energy density of the battery pack 100.

[0149] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack having a first direction, characterized in that: include: A box body, the box body comprising: a bottom plate, a side beam, a first support portion and a second support portion, the side beam is arranged around the edge of the bottom plate, and the bottom plate and the side beam cooperate to enclose a receiving cavity, the first support portion and the second support portion are both protrudingly arranged and connected to a side of the side beam close to the receiving cavity, and the first support portion is arranged close to the bottom plate relative to the second support portion; a first battery assembly disposed in the accommodating cavity, the first battery assembly comprising: a first supporting member and a plurality of first single cells, the plurality of first single cells being disposed on a side of the first supporting member away from the bottom plate, and the first supporting member being connected to the first supporting portion; and A second battery assembly is disposed in the accommodating cavity, the second battery assembly comprising: a second supporting member and a plurality of second single cells, the plurality of second single cells are disposed on a side of the second supporting member away from the bottom plate, and the second supporting member is connected to the second supporting portion; The maximum dimension of the first support portion in the first direction is H1 mm, and the maximum dimension of the second support portion in the first direction is H2 mm, satisfying: H1>H2.

2. The battery pack according to claim 1, characterized in that: The battery pack also has a second direction intersecting with the first direction; The second supporting portion comprises: a first sub-support portion, the first sub-support portion extending along the second direction, and the first sub-support portion is protrudingly arranged and connected to a side of the side beam close to the accommodating cavity; and The second sub-support portion is connected to a side of the first sub-support portion close to the accommodating cavity, and the second supporting member is connected to the second sub-support portion.

3. The battery pack according to claim 2, characterized in that: There are multiple second sub-support parts, each of which is connected to a side of the first sub-support part close to the accommodating cavity, and the multiple second sub-support parts are spaced apart in the second direction, and the second supporting member is connected to the multiple second sub-support parts.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The battery pack also has a second direction intersecting with the first direction; The side beam comprises: a first beam, a second beam, a third beam, and a fourth beam connected to each other; The first beam and the third beam both extend along the first direction, and the first beam and the third beam are spaced apart in the second direction; the second beam and the fourth beam both extend along the second direction, and the second beam and the fourth beam are spaced apart in the first direction; The first supporting part and the second supporting part are both provided in plurality, the second beam and the fourth beam are both connected with the first supporting part and the second supporting part, one of the first supporting parts is connected to a side of the second beam close to the accommodating cavity, and another of the first supporting parts is connected to a side of the fourth beam close to the accommodating cavity; One of the second supporting parts is connected to a side of the second beam close to the accommodating cavity, and another of the second supporting parts is connected to a side of the fourth beam close to the accommodating cavity.

5. The battery pack according to claim 1, wherein: A first fixing hole is formed on the first supporting portion; The battery pack further includes: a first fixing member, which is disposed on the first supporting member, and the first fixing member is passed through the first fixing hole to be fixedly connected to the first supporting portion to position and fix the first supporting member.

6. The battery pack according to claim 5, characterized in that: A heat-melting portion is provided on a side of the first supporting member away from the first single battery, and the heat-melting portion is fixed to the bottom plate by heat-melting.

7. The battery pack according to claim 3, characterized in that: The second sub-support portion is provided with a fixing groove, and the second supporting member is provided with a second fixing hole; The battery pack further includes: a second fixing member disposed in the fixing groove, and a third fixing hole is formed on the second fixing member; and A rivet member is inserted into the second fixing hole and the third fixing hole to be fixedly connected with the second fixing member so as to position and fix the second supporting member.

8. The battery pack according to claim 7, characterized in that: The battery pack further has a third direction intersecting the first direction and the second direction in pairs; A limiting wall is provided on a side of the second sub-support portion away from the first support portion, and the limiting wall is located in a circumferential area of ​​the fixing groove; The second fixing member comprises: two first side walls arranged opposite to each other in the second direction, and a second side wall and a third side wall arranged opposite to each other in the third direction, the second side wall being arranged opposite to the third side wall and close to the limiting wall, the first side wall, the second side wall and the third side wall together form a riveting cavity, the third fixing hole is provided on the second side wall, and the third fixing hole is communicated with the riveting cavity; The rivet is passed through the second fixing hole and the third fixing hole to locate part of the rivet in the rivet cavity and to be riveted to the second side wall so that the second side wall abuts against the limiting wall to position and fix the second supporting member.

9. The battery pack according to claim 1, characterized in that: The first supporting member has a first hanging ring portion, and the first hanging ring portion is used to load the first battery assembly into the accommodating cavity; The second supporting member has a second hanging ring portion, and the second hanging ring portion is used to load the second battery assembly into the accommodating cavity.

10. The battery pack according to claim 1, wherein: The bottom plate and the side beams are welded and fixed.

11. An electrical device, characterized in that: include: The battery pack according to any one of claims 1 to 10, wherein the battery pack serves as a power supply for the electrical device.

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