Battery pack box body and battery pack

Abstract

The embodiment of the utility model discloses a battery pack box body and a battery pack. The battery pack box body comprises a bottom plate; the connecting beam is connected to the bottom plate, at least part of the connecting beam and the bottom plate are matched to define a containing cavity, and the containing cavity is used for containing a single battery; the connecting beam comprises a force bearing part and a connecting part, the energy absorption part is connected with the force bearing part, a filling cavity is defined by the energy absorption part, and / or the filling cavity is defined by the energy absorption part and the force bearing part; and the filling body is filled in the filling cavity. According to the battery pack box body, the overall strength of the battery pack box body is improved, the impact resistance and extrusion resistance of the battery pack box body are enhanced, and the safety performance of the battery pack box body is improved, so that the overall stability of the battery pack is ensured, and the service life of the battery pack is prolonged; meanwhile, the interior of the battery pack box body is protected from being corroded, the risk of failure of the battery pack box body is greatly reduced, and finally the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack case and a battery pack. Background Art

[0002] 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 batteries with larger capacity, longer durability and greater safety. The battery pack box is one of the core parts of the battery pack. Therefore, how to improve the safety performance of the battery pack box to improve the safety performance of the battery pack has become an urgent problem to be solved. Utility Model Content

[0003] The embodiments of the present application provide a battery pack case and a battery pack to improve the safety performance 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 case is provided, comprising: a bottom plate; and

[0006] A connecting beam connected to the bottom plate, wherein at least a portion of the connecting beam and the bottom plate cooperate to form a receiving cavity, and the receiving cavity is used to receive a single battery;

[0007] Wherein, the connecting beam comprises:

[0008] Load-bearing department;

[0009] an energy absorbing portion connected to the load-bearing portion, wherein the energy absorbing portion encloses a filling cavity, and / or the energy absorbing portion and the load-bearing portion enclose a filling cavity; and

[0010] A filling body is filled in the filling cavity.

[0011] In addition to one or more of the features disclosed above, or as an alternative, the load-bearing part is a long plate-like structure, and has a receiving cavity inside, and the energy-absorbing part is arranged inside the receiving cavity, and the energy-absorbing part divides the receiving cavity to obtain a plurality of the filling cavities.

[0012] In addition to or as an alternative to one or more features disclosed above, the energy absorbing part includes a plurality of connecting parts, the load-bearing part has a thickness direction, the plurality of connecting parts extend along the thickness direction, and the plurality of connecting parts are connected and enclosed to form the filling cavity.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the plurality of connecting parts are connected and enclosed to form a plurality of polygonal structures, each of the polygonal structures is a sub-energy absorbing part, and the energy absorbing part includes a plurality of sub-energy absorbing parts.

[0014] In addition to or instead of one or more of the features disclosed above, the load-bearing part further has a length direction intersecting with the thickness direction, the plurality of sub-energy-absorbing parts are arranged along the length direction, the sub-energy-absorbing parts are arranged in at least two rows, and along the length direction, the connecting parts of two adjacent sub-energy-absorbing parts in any two adjacent rows of sub-energy-absorbing parts are connected.

[0015] In addition to or as an alternative to the above-disclosed one or more features, in the length direction, the connecting portions of any two adjacent sub-energy absorbing portions are connected.

[0016] In addition to or instead of one or more of the features disclosed above, the battery pack case has a first direction and a second direction intersecting each other;

[0017] The connecting beam comprises: a side beam portion connected to a circumferential region of the bottom plate;

[0018] A cross beam portion extends along a first direction and is connected to the side beam portion; and a longitudinal beam portion extends along the second direction and is connected to the side beam portion; the side beam portion, the cross beam portion and the longitudinal beam portion cooperate with the bottom plate to form a receiving cavity.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the battery pack case further has a reference plane perpendicular to the first direction;

[0020] The orthographic projection of the sub-energy absorbing portion on the reference plane is a hexagon or a quadrilateral.

[0021] In addition to or as an alternative to one or more of the features disclosed above, the load-bearing portion is a long strip plate-like structure, and the energy-absorbing portion is arranged around the surface of the load-bearing portion to form the filling cavity.

[0022] In addition to or as an alternative to one or more of the features disclosed above, the filler is at least one of a polyurethane adhesive, an acrylic adhesive or an epoxy resin adhesive.

[0023] On the other hand, a battery pack is further disclosed, in addition to or as an alternative to one or more of the features disclosed above, the battery pack comprises a battery pack case as described in any one of the above items; and

[0024] The single cell battery is housed in the battery pack box.

[0025] One of the above technical solutions has the following advantages or beneficial effects: the present application arranges an energy-absorbing part on the load-bearing part so that when the battery pack is hit by external force, the energy-absorbing part assists the load-bearing part to jointly resist the impact of the external force, thereby improving the overall strength of the battery pack case, enhancing the impact resistance and extrusion resistance of the battery pack case, and improving the safety performance of the battery pack case to ensure the overall stability of the battery pack, which is beneficial to increasing the service life of the battery pack; at the same time, the present application arranges a filling body in the filling cavity to further enhance the impact resistance and extrusion resistance of the battery pack case, so as to achieve better protection and support for the single cells in the battery pack case, and protect the inside of the battery pack case from corrosion, greatly reducing the risk of failure of the battery pack case, and ultimately improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 is a three-dimensional structural view of a battery pack box provided according to an embodiment of the present application;

[0028] Figure 2 is an exploded structural view of a battery pack box provided according to an embodiment of the present application;

[0029] Figure 3 is a cross-sectional view of a battery pack box along the AA direction according to an embodiment of the present application;

[0030] Figure 4 is a cross-sectional view of a battery pack box according to an embodiment of the present application along the AA direction with the filling body hidden;

[0031] Figure 5 is a cross-sectional view of a battery pack box along the BB direction according to an embodiment of the present application;

[0032] Figure 6 is a cross-sectional view of a battery pack box along the CC direction provided in an embodiment of the present application;

[0033] Figure 7 It is a schematic diagram of the structure of a battery pack provided according to an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100. Battery pack box;

[0036] 110, bottom plate;

[0037] 120, connecting beam; 121, load-bearing part; 1211, receiving cavity; 122, energy-absorbing part; 1221, filling cavity; 1222, connecting part; 1223, sub-energy-absorbing part; 123, filling body; 124, side beam part; 125, cross beam part; 126, longitudinal beam part;

[0038] 130, accommodating chamber;

[0039] 200. Single cell battery. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and beneficial effects of this application clearer, 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] As one of the important structural parts of the battery pack, the battery pack box plays an important role in bearing the weight of the battery pack. The existing battery pack box is made of aluminum alloy or high-strength steel. However, the battery pack boxes made of the above two materials have certain disadvantages: the battery pack box made of aluminum alloy has a high raw material cost, and the battery pack box has weak impact resistance, resulting in poor safety performance of the battery pack; the battery pack box made of high-strength steel can ensure the impact resistance of the battery pack box, but due to the high strength of the material, it is difficult to form and the production cost is also high. The disadvantages outweigh the advantages.

[0045] In order to solve the above problems, in the embodiments of the present application, please refer to Figures 1 to 7 The present application provides a battery pack, which may include: a battery pack case 100 and a single battery 200, wherein the single battery 200 is accommodated in the battery pack case 100.

[0046] The battery pack may be a battery pack with three layers of single cell-battery module-battery pack, that is, the single cells are first grouped into battery modules, and then the battery modules are placed in the battery pack box 100 to form a battery pack; or a battery pack with two layers of single cell-battery pack, that is, the single cell 200 is directly placed in the battery pack box 100 to form a battery pack. This is not specifically limited in this application, and can be specifically set according to actual circumstances, as long as it does not affect the effect of this application.

[0047] The single cell 200 may be a lithium-ion battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0048] The single battery 200 may also be cylindrical, flat, rectangular or other shapes.

[0049] The single cell 200 includes a shell (not shown in the figure), an electrode assembly (not shown in the figure), an electrolyte, an end cap (not shown in the figure), a pole (not shown in the figure) and other functional components. The electrode assembly and the electrolyte are contained in the shell, and the electrolyte infiltrates the electrode assembly, and the end cap covers the shell to seal the shell. The electrode assembly is a component in the single cell 200 where an electrochemical reaction occurs, and there may be one or more electrode assemblies. 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 substances constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances each constitute a pole ear. During the charge and discharge process of the single cell 200, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the pole ear is connected to the pole to form a current loop.

[0050] In one embodiment, the battery pack further includes: a top cover (not shown), a liquid cooling element (not shown), a battery pack disconnecting unit (not shown) and other functional elements. The top cover covers the battery pack case 100 to seal the battery pack as a whole, the liquid cooling element is contained in the battery pack case 100 and is disposed on the outer surface of the single battery 200 to cool the battery pack, and the battery pack disconnecting unit is electrically connected to each single battery 200 to directly cut off the battery circuit when the battery is overcharged, overheated, overcurrent, etc., to avoid danger.

[0051] In one embodiment, please refer to Figure 1 to Figure 2 The battery pack body 100 includes: a bottom plate 110 and a connecting beam 120; the connecting beam 120 is connected to the bottom plate 110, and at least part of the connecting beam 120 and the bottom plate 110 cooperate to form a receiving cavity 130, and the receiving cavity 130 is used to receive the single cell 200, that is, the single cell 200 is received in the receiving cavity 130.

[0052] The bottom plate 110 and the connecting beam 120 may be integrally formed, or the bottom plate 110 and the connecting beam 120 may be separately provided, and the two may be fixedly connected by welding or other processes, which is not specifically limited in this application and may be specifically provided according to actual circumstances. For example, the bottom plate 110 and the connecting beam 120 may be separately provided, and the bottom plate 110 may be fixedly connected to the connecting beam 120 by bolts.

[0053] The bottom plate 110 and the connecting beam 120 are made of ordinary steel or aluminum, but are not limited thereto. For example, the bottom plate 110 and the connecting beam 120 are made of steel with a tensile strength of less than 1500 MPa to reduce production costs while ensuring the overall strength of the battery pack body 100.

[0054] The connection beam 120 can be formed by different molding processes according to different materials. Specifically, for example, when the material of the connection beam 120 is ordinary steel, the steel can be bent multiple times by using a bending device, and then welded to form the connection beam 120 after the multiple bendings are completed. When the material of the connection beam is aluminum, the connection beam 120 can be formed by using a molding device such as extrusion or die casting.

[0055] The bottom plate 110 is formed by punching a steel plate using a punching device.

[0056] The cross section of the connecting beam 120 may be a triangle, a quadrilateral, a pentagon, a hexagon or other shapes.

[0057] For details, please refer to Figure 3 to Figure 4 The connecting beam 120 includes a load-bearing portion 121 , an energy-absorbing portion 122 and a filling body 123 .

[0058] The energy absorbing part 122 is connected to the load-bearing part 121. Specifically, the energy absorbing part 122 can be arranged inside the load-bearing part 121, so that the energy absorbing part 122 and the load-bearing part 121 surround the filling cavity 1221; or, the energy absorbing part 122 can be arranged outside the load-bearing part 121, so that the energy absorbing part 122 surrounds the filling cavity 1221, or part of the energy absorbing part 122 is arranged inside the load-bearing part 121, part of the energy absorbing part 122 is arranged outside the load-bearing part 121, so that part of the energy absorbing part 122 and the load-bearing part 121 surround the filling cavity 1221, and part of the energy absorbing part 122 surrounds the filling cavity 1221 alone. The filling body 123 is filled in the filling cavity 1221.

[0059] Among them, the load-bearing part 121 can be integrally formed with the energy-absorbing part 122, and the load-bearing part 121 can also be separately set from the energy-absorbing part 122, and the two are fixedly connected by welding and other processes. This application does not make specific restrictions and can be specifically set according to actual circumstances.

[0060] The energy absorbing part 122 may be made of plastic, but is not limited thereto. For example, the energy absorbing part 122 may be made of a material with a tensile strength of 20 to 300 MPa.

[0061] The filler 123 is at least one of polyurethane adhesive, acrylic adhesive or epoxy resin adhesive, but is not limited thereto.

[0062] It can be understood that the present application sets an energy-absorbing portion 122 on the load-bearing portion 121, so that when the battery pack is impacted by external force, the energy-absorbing portion 122 assists the load-bearing portion 121 to jointly resist the impact of the external force, thereby improving the overall strength of the battery pack case 100, enhancing the impact and extrusion resistance of the battery pack case 100, and improving the safety performance of the battery pack case 100, so as to ensure the overall stability of the battery pack, which is beneficial to increasing the service life of the battery pack; at the same time, the present application sets a filling body 123 in the filling cavity 1221, so as to further enhance the impact and extrusion resistance of the battery pack case 100, so as to achieve better protection and support for the single cells 200 in the battery pack case 100, and protect the inside of the battery pack case 100 from corrosion, thereby greatly reducing the risk of failure of the battery pack case 100, and ultimately improving the safety performance of the battery pack.

[0063] In one embodiment, please refer to Figure 3 to Figure 4 The load-bearing part 121 is a long strip plate-like structure, and the load-bearing part 121 has a receiving cavity 1211 inside, and the energy-absorbing part 122 is arranged inside the receiving cavity 1211. The energy-absorbing part 122 divides the receiving cavity 1211 to obtain a plurality of filling cavities 1221, so that a plurality of filling bodies 123 are accommodated by the plurality of filling cavities 1221. The present application arranges the energy-absorbing part 122 inside the receiving cavity 1211, so as to reduce the occupied space of the energy-absorbing part 122 while ensuring the impact resistance and extrusion resistance of the battery pack case 100, so as to place more single cells 200 in the battery pack case 100 and improve the capacity of the battery pack.

[0064] In another embodiment, the load-bearing portion 121 is a long strip-shaped plate-like structure, and the energy-absorbing portion 122 is disposed on the surface of the load-bearing portion 121 to form a filling cavity 1221. In the present application, the energy-absorbing portion 122 is disposed on the surface of the load-bearing portion 121, so that the energy-absorbing portion 122 and the load-bearing portion 121 can be used to resist the impact of external forces in turn, thereby further improving the impact resistance and compression resistance of the battery pack box 100, ensuring the overall stability of the battery pack, and improving the safety performance of the battery pack.

[0065] Further, in one embodiment, please refer to Figure 3 to Figure 4 The load-bearing portion 121 has a thickness direction, and the energy-absorbing portion 122 includes a plurality of connecting portions 1222 ， The plurality of connection parts 1222 extend along the thickness direction, and the plurality of connection parts 1222 are connected and enclosed to form a filling cavity 1221 .

[0066] Among them, the multiple connecting parts 1222 can be formed as one piece, and the multiple connecting parts 1222 can also be set separately, and the two are fixedly connected by welding and other processes. There is no specific limitation in this application and it can be specifically set according to the actual situation.

[0067] In the present application, the connecting portion 1222 is arranged to extend along the thickness direction of the load-bearing portion 121, that is, the energy-absorbing portion 122 is arranged to extend along the thickness direction of the load-bearing portion 121, thereby ensuring that the energy-absorbing portion 122 assists the load-bearing portion 121 to better resist the impact of external force, thereby improving the overall strength of the battery pack case 100, enhancing the impact resistance and extrusion resistance of the battery pack case 100, and ultimately improving the safety performance of the battery pack.

[0068] In one embodiment, please refer to Figure 3 to Figure 4 , multiple connecting parts 1222 are connected and enclosed to form multiple polygonal structures, each polygonal structure is a sub-energy absorbing part 1223, and the energy absorbing part 122 includes multiple sub-energy absorbing parts 1223. In the present application, the energy absorbing part 122 is composed of multiple sub-energy absorbing parts 1223 to improve the impact resistance and extrusion resistance of the energy absorbing part 122, thereby enhancing the impact resistance and extrusion resistance of the battery pack box 100, and finally improving the safety performance of the battery pack.

[0069] In one embodiment, please refer to Figure 3 to Figure 4 The load-bearing portion 121 also has a length direction intersecting with the thickness direction, and a plurality of sub-energy absorbing portions 1223 are arranged along the length direction, and the sub-energy absorbing portions 1223 are arranged in at least two rows, and along the length direction, any two adjacent sub-energy absorbing portions 1223 in the same row share a connecting portion 1222. In the present application, any two adjacent sub-energy absorbing portions 1223 share a connecting portion 1222 to save production materials of the energy absorbing portion 122, thereby reducing the production cost of the energy absorbing portion 1223, and ultimately reducing the production cost of the battery pack box 100.

[0070] In one embodiment, the sub-energy absorbing parts 1223 are arranged in at least two rows. In the length direction, the connecting parts 1222 of two adjacent sub-energy absorbing parts 1223 in any two adjacent rows of sub-energy absorbing parts 1223 are connected to connect the multiple sub-energy absorbing parts 1223 into one, so as to further enhance the impact resistance and extrusion resistance of the energy absorbing part 122, thereby enhancing the impact resistance and extrusion resistance of the battery pack case 100, and ultimately improving the safety performance of the battery pack.

[0071] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 The battery pack body 100 has a first direction X and a second direction Y intersecting each other; the connecting beam 120 includes: a side beam portion 124 , a cross beam portion 125 and a longitudinal beam portion 126 .

[0072] The side beam portion 124 is connected to the circumferential area of ​​the bottom plate 110; the cross beam portion 125 extends along the first direction X, and the cross beam portion 125 is connected to the side beam portion 124; the longitudinal beam portion 126 extends along the second direction Y, and the longitudinal beam portion 126 is connected to the side beam portion 124, and the side beam portion 124, the cross beam portion 125 and the longitudinal beam portion 126 cooperate with the bottom plate 110 to form a accommodating cavity 130.

[0073] The side beam portion 124 , the cross beam portion 125 and the longitudinal beam portion 126 are all formed by welding after being bent by ordinary steel using bending equipment.

[0074] The side beam 124 is fixed to the bottom plate 110 by bolts. The cross beam 125 is welded to the side beam 124, and the longitudinal beam 126 is welded to the side beam 124 and the cross beam 125, so as to further improve the overall strength of the battery pack box 100, enhance the impact and extrusion resistance of the battery pack box 100, and reduce the risk of box deformation or even cracking caused by weld failure, thereby improving the safety performance of the battery pack.

[0075] The cross section of the side beam portion 124 is in a square shape, and the cross section of the horizontal beam portion 125 and the longitudinal beam portion 126 are both in a square shape, but the present invention is not limited thereto.

[0076] In the present application, the connecting beam 120 includes: a side beam portion 124, a cross beam portion 125 and a longitudinal beam portion 126, that is, an energy absorbing portion 122 is provided on the side beam portion 124, the cross beam portion 125 and the longitudinal beam portion 126, and a filling body 123 is provided in the filling cavity 1221 of the side beam portion 124, the cross beam portion 125 and the longitudinal beam portion 126 to improve the strength of the side beam portion 124, the cross beam portion 125 and the longitudinal beam portion 126, thereby improving the overall strength of the battery pack case 100, enhancing the impact resistance and extrusion resistance of the battery pack case 100, ensuring the overall stability of the battery pack, which is beneficial to improving the service life of the battery pack and improving the safety performance of the battery pack.

[0077] In one embodiment, please refer to Figure 3 to Figure 4 The battery pack body 100 also has a reference plane P perpendicular to the first direction X; the orthographic projection of the sub-energy absorbing portion 1223 on the reference plane P is a hexagon or a quadrilateral, but is not limited thereto.

[0078] It can be understood that hexagons and quadrilaterals have better stability. The present application ensures that the sub-energy absorbing portion 1223 has a certain stability by setting the orthographic projection of the sub-energy absorbing portion 1223 on the reference plane P to a hexagon or a quadrilateral, thereby ensuring the impact and extrusion resistance of the sub-energy absorbing portion 1223, ensuring the overall stability of the battery pack, and is beneficial to increasing the service life of the battery pack and enhancing the safety performance of the battery pack.

[0079] In one embodiment, a plurality of criss-cross reinforcing ribs are provided on the bottom plate 110 to increase the structural strength of the bottom plate 110 , and can also provide force support for the single battery 200 , further enhancing the impact resistance and extrusion resistance of the battery pack box 100 , ensuring the overall stability of the battery pack, which is beneficial to increasing the service life of the battery pack and enhancing the safety performance of the battery pack.

[0080] On the other hand, in an embodiment of the present application, the present application further provides an electric device, including a battery pack as described above, which serves as a power supply for the electric device. The electric device described above 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 and a satellite, an energy storage system, etc.

[0081] 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 box, characterized in that: include: Base plate; as well as A connecting beam connected to the bottom plate, wherein at least a portion of the connecting beam and the bottom plate cooperate to form a receiving cavity, and the receiving cavity is used to receive a single battery; Wherein, the connecting beam comprises: Load-bearing department; an energy absorbing portion connected to the load-bearing portion, wherein the energy absorbing portion encloses a filling cavity, and / or the energy absorbing portion and the load-bearing portion enclose a filling cavity; and A filling body is filled in the filling cavity.

2. The battery pack box according to claim 1, characterized in that: The load-bearing part is a long strip plate-shaped structure, and has a receiving cavity inside. The energy-absorbing part is arranged inside the receiving cavity, and the energy-absorbing part divides the receiving cavity to obtain a plurality of the filling cavities.

3. The battery pack box according to claim 2, characterized in that: The energy absorbing part comprises a plurality of connecting parts, the load bearing part has a thickness direction, the plurality of connecting parts extend along the thickness direction, and the plurality of connecting parts are connected and enclosed to form the filling cavity.

4. The battery pack box according to claim 3, characterized in that: The multiple connecting parts are connected and enclosed to form a plurality of polygonal structures, each of the polygonal structures is a sub-energy absorbing part, and the energy absorbing part includes a plurality of sub-energy absorbing parts.

5. The battery pack case according to claim 4, characterized in that: The load-bearing part also has a length direction intersecting with the thickness direction, and the multiple sub-energy-absorbing parts are arranged along the length direction. The sub-energy-absorbing parts are arranged in at least two rows, and along the length direction, any two adjacent sub-energy-absorbing parts in the same row share a connecting part.

6. The battery pack case according to claim 5, characterized in that: In the length direction, the connecting portions of two adjacent energy absorbing sub-parts in any two adjacent rows of energy absorbing sub-parts are connected.

7. The battery pack case according to claim 4, characterized in that: The battery pack box has a first direction and a second direction intersecting each other; The connecting beam comprises: a side beam portion connected to a circumferential region of the bottom plate; a cross beam portion extending along a first direction and connected to the side beam portion; and a longitudinal beam portion extending along the second direction and connected to the side beam portion; The side beam portion, the cross beam portion and the longitudinal beam portion cooperate with the bottom plate to form a receiving cavity.

8. The battery pack box according to claim 7, characterized in that: The battery pack case also has a reference plane perpendicular to the first direction; The orthographic projection of the sub-energy absorbing portion on the reference plane is a hexagon or a quadrilateral.

9. The battery pack case according to claim 1, characterized in that: The load-bearing portion is a long strip plate-shaped structure, and the energy-absorbing portion is arranged around the surface of the load-bearing portion to form the filling cavity.

10. The battery pack case according to claim 4, characterized in that: The filler is at least one of polyurethane adhesive, acrylic adhesive or epoxy resin adhesive.

11. A battery pack, characterized in that: A battery pack case comprising the battery pack case according to any one of claims 1 to 10; and The single cell battery is housed in the battery pack box.

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