Battery pack box body, battery pack and power utilization device

Abstract

The utility model provides a battery pack box body, a battery pack and a power utilization device, and relates to the technical field of batteries, the battery pack box body is used for installing a battery module, the battery pack box body comprises a frame, a limiting plate and a supporting beam, the frame comprises two first side plates and two second side plates, the two first side plates are oppositely arranged at intervals in the first direction, and the two second side plates are oppositely arranged at intervals in the second direction; the adjacent first side plates and second side plates are sequentially connected end to end to define a containing space. The limiting plate is arranged in the accommodating space and extends along the second direction to be connected between the two second side plates so as to limit the battery module in the first direction; the supporting beams extend in the first direction, are arranged at the bottoms of the limiting plates and are used for supporting the battery modules, and hollow structures are formed between every two adjacent supporting beams or between the supporting beams and the bottoms of the adjacent second side plates. According to the battery pack box body, parts of the box body are reduced, so that the box body meets the requirement of light weight, and meanwhile, the box body can meet the requirement of high strength.

Description

Technical Field

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

[0002] With the continuous development of battery technology and the increasing demand, battery packs are also developing towards high-rate fast charging and CTP integration. The battery pack case structure in related technologies makes the overall weight of the battery pack heavier, resulting in the battery pack not being lightweight enough. Therefore, providing a battery pack case with higher strength and lightness is an urgent problem to be solved in the battery field. Utility Model Content

[0003] The purpose of the present application is to provide a battery pack case, a battery pack and an electrical device to solve the technical problem in the related art that the battery pack case is not lightweight and strong enough.

[0004] To achieve the above-mentioned objectives, the technical solution adopted in the present application is: in the first aspect, the present application provides a battery pack case for installing a battery module, including: a frame, a limiting plate and a support beam, the frame including two first side panels relatively spaced apart along a first direction A and two second side panels relatively spaced apart along a second direction B, the adjacent first side panels and the second side panels are connected end to end in sequence to enclose a accommodating space; the limiting plate is arranged in the accommodating space, and extends along the second direction B to be connected between the two second side panels to limit the battery module in the first direction A; the support beam extends along the first direction A and is arranged at the bottom of the limiting plate, for supporting the battery module, and a hollow structure is formed between two adjacent support beams or between the support beam and the bottom of the adjacent second side panels.

[0005] In one or more embodiments of the present application, the number of the limiting plate is at least one;

[0006] When the number of the limiting plate is one, the limiting plate divides the accommodation space into an electrical area and a battery module area;

[0007] When the number of the limiting plates is more than one, one of the limiting plates divides the accommodating space into an electrical area and a battery module area, and the other limiting plates divide the battery module area into a plurality of battery sub-module areas.

[0008] In one or more embodiments of the present application, the number of the supporting beam is at least one, and the at least one supporting beam separates each battery sub-module area in the second direction B with equal distance.

[0009] In one or more embodiments of the present application, a load-bearing beam is further provided at the bottom of the second side plate in the battery module area facing the battery module, and a hollow-bottomed accommodating cavity for accommodating the battery module is formed between the load-bearing beam, the support beam and the limit plate in the battery module area or between two adjacent support beams and the limit plate.

[0010] In a second aspect, the present application also provides a battery pack, comprising:

[0011] A battery module, comprising at least one group of battery cells, each group of battery cells comprising a plurality of battery cells, the plurality of battery cells being arranged side by side in a thickness direction; and

[0012] As in the battery pack case described in the first aspect, each group of battery cells is arranged in each accommodating cavity in a manner that the poles of the battery cells face the hollow structure.

[0013] In one or more embodiments of the present application, the battery unit further includes:

[0014] A first elastic spacer is arranged between two adjacent battery cells along the thickness direction;

[0015] A second elastic spacer is arranged at the outermost side of the battery cell along the thickness direction;

[0016] The compression amount of the first elastic spacer and the second elastic spacer when compressed is 10% to 60%.

[0017] In one or more embodiments of the present application, the area of ​​the first elastic spacer is S1, the large surface area of ​​the battery cell is S0, and the following conditions are satisfied: 80% S0≤S1≤95% S0;

[0018] The area S2 of the second elastic spacer is larger than the large surface area S0 of the battery cell, and the roughness of the side of the second elastic spacer facing the battery cell is larger than the roughness of the side away from the battery cell.

[0019] In one or more embodiments of the present application, the first elastic spacer and the second elastic spacer both include an outer frame and a spacer plate, the outer frame is arranged on the outer periphery of the spacer plate, in the thickness direction of the first elastic spacer or the second elastic spacer, the side surface of the outer frame protrudes from the side surface of the spacer plate, and the length of the side surface of the outer frame protruding from the side surface of the spacer plate is not less than 1 mm;

[0020] The edge of the large surface of the battery cell protrudes from the outer frame of the first elastic spacer, and the length of the edge of the large surface of the battery cell protruding from the outer frame of the first elastic spacer is 0.5-3mm;

[0021] The outer frame of the second elastic spacer protrudes from the edge of the large surface of the battery cell, and the length of the outer frame of the second elastic spacer protruding from the edge of the large surface of the battery cell is 1-5 mm.

[0022] In one or more embodiments of the present application, it also includes:

[0023] The CCS component is connected to the pole of the battery cell and is used to electrically connect each battery cell and collect the signal of each battery cell;

[0024] A first cooling structure is provided on a side of the CCS assembly away from the battery module and is used to cool the CCS assembly;

[0025] A first heat-conducting insulating layer is disposed between the first cooling structure and the CCS assembly;

[0026] The second cooling structure is arranged on a side of the battery module away from the pole;

[0027] The second heat-conducting insulating layer is arranged between the battery module and the second cooling structure.

[0028] In a third aspect, the present application further provides an electrical device comprising the battery pack as described in the second aspect.

[0029] Based on the above technical solutions, the battery pack box, battery pack and power-consuming device provided in the embodiments of the present application have at least the following beneficial technical effects:

[0030] The battery pack case provided in the embodiment of the present application includes a frame, a limiting plate and a support beam, the frame includes two first side plates relatively spaced apart along a first direction A and two second side plates relatively spaced apart along a second direction B, the adjacent first side plates and the second side plates are connected end to end in sequence to enclose an accommodating space; the limiting plate is arranged in the accommodating space and extends along the second direction B to be connected between the two second side plates to limit the battery module in the first direction A; the support beam extends along the first direction A and is arranged at the bottom of the limiting plate to support the battery module, forming a hollow structure between two adjacent support beams or between the support beam and the bottom of the adjacent second side plates. Furthermore, by setting a limit plate in the accommodating space formed by connecting the first side plate and the second side plate end to end in sequence, the battery module is limited in the first direction A by the limit plate, and a plurality of support beams are extended along the first direction A at the bottom of the limit plate, the battery module is supported by the support beams, and a hollow structure is formed between two adjacent support beams or between the support beam and the bottom of the adjacent second side plate, thereby reducing the parts of the box body and making the box body meet the lightweight requirements. At the same time, the setting of the limit plate and the support beam can also make the box body meet the high strength requirements.

[0031] The battery pack provided by the embodiment of the present application includes: a battery module and the battery pack box, the battery module includes at least one group of battery cells, each group of battery cells includes multiple battery cells, and the multiple battery cells are arranged side by side along the thickness direction; each group of battery cells is arranged in each accommodating cavity in a manner that the poles of the battery cells face the hollow structure. This reduces the weight of the entire battery pack, optimizes the assembly and assembly process of the battery module, saves the space occupied by the battery module, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 is a schematic diagram of the three-dimensional structure of a battery pack box provided by one or more embodiments of the present application;

[0034] Figure 2 is a schematic diagram of a top view of a battery pack box provided by one or more embodiments of the present application;

[0035] Figure 3 yes Figure 2 AA cross section in;

[0036] Figure 4 is a bottom view structural diagram of a battery pack box provided by one or more embodiments of the present application;

[0037] Figure 5 is a schematic diagram of the three-dimensional structure of a battery module provided by one or more embodiments of the present application;

[0038] Figure 6 is a schematic diagram of an exploded structure of a battery module provided by one or more embodiments of the present application;

[0039] Figure 7 is a schematic diagram of the three-dimensional structure of a first elastic spacer or a second elastic spacer provided in one or more embodiments of the present application;

[0040] Figure 8 is a schematic diagram of an exploded structure of a battery pack provided by one or more embodiments of the present application;

[0041] Fig. 9 It is a schematic diagram of the three-dimensional structure of a battery pack provided in one or more embodiments of the present application.

[0042] In the figure: 1-battery pack body; 2-battery module; 10-frame; 11-second side panel; 12-first side panel; 13-support beam; 14-limiting plate; 15-bearing beam; 16-electrical area; 17-hollow structure; 18-battery module area; 19-support plate; 20-battery unit; 21-battery single cell; 22-first elastic spacer; 23-second elastic spacer; 30-second thermally conductive insulating layer; 40-second cooling structure; 50-top guard plate; 60-CCS assembly; 70-first thermally conductive insulating layer; 80-first cooling structure; 90-bottom guard plate; 100-accommodating space; 141-partition; 142-cavity; 181-first battery module area; 182-second battery module area; 221-outer frame; 222-partition plate. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and 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 should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] Currently, battery packs are gradually developing towards high-rate fast charging and CTP integration. When the battery pack is fast charged, the battery will generate a large amount of heat, so a cooling method with higher cooling efficiency is needed. However, while the related technology improves the battery cooling efficiency, it will bring additional new structures to the battery pack case, resulting in a heavier overall weight of the battery pack case, making the battery pack not highly integrated and not lightweight enough.

[0048] Based on the above considerations, in order to solve the technical problem that the battery pack case in the prior art is not lightweight and high-strength enough, the present application provides a battery pack case for installing a battery module, including: a frame, a limiting plate and a support beam, the frame including two first side panels relatively spaced apart along a first direction A and two second side panels relatively spaced apart along a second direction B, the adjacent first side panels and the second side panels being connected end to end in sequence to enclose a accommodating space; the limiting plate is arranged in the accommodating space, and extends along the second direction B to be connected between the two second side panels to limit the battery module in the first direction A; the support beam extends along the first direction A and is arranged at the bottom of the limiting plate, for supporting the battery module, and a hollow structure is formed between two adjacent support beams or between the support beam and the bottom of the adjacent second side panels.

[0049] By setting a limit plate in a accommodating space formed by connecting the first side plate and the second side plate end to end in sequence, the battery module is limited in the first direction A by the limit plate, and a support beam extending along the first direction A is set at the bottom of the limit plate, and the battery module is supported by the support beam, a hollow structure is formed between two adjacent support beams or between the support beam and the bottom of the adjacent second side plate, thereby reducing the number of parts of the box body and making the box body meet the lightweight requirements. At the same time, the setting of the limit plate and the support beam can also make the box body meet the high strength requirements.

[0050] The battery pack case of the present application can be applied to electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements.

[0051] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0052] First, please refer to Figures 1 to 3The embodiment of the present application provides a battery pack case for installing a battery module 2, including: a frame 10, a limiting plate 14 and a support beam 13, the frame 10 includes two first side plates 12 relatively spaced apart along a first direction A and two second side plates 11 relatively spaced apart along a second direction B, the adjacent first side plates 12 and the second side plates 11 are connected end to end in sequence to enclose a receiving space 100; the limiting plate 14 is arranged in the receiving space 100, and extends along the second direction B to be connected between the two second side plates 11 to limit the battery module 2 in the first direction A; the support beam 13 extends along the first direction A and is arranged at the bottom of the limiting plate 14, for supporting the battery module 2, and a hollow structure 17 is formed between two adjacent support beams 13 or between the support beam 13 and the bottom of the adjacent second side plate 11.

[0053] Among them, the frame 10 is a square frame formed by connecting the first side plate 12 and the second side plate 11 in sequence end to end, and the top and bottom of the frame 10 are both open structures. The limiting plate 14 is arranged in the accommodating space 100, and extends along the second direction B and is connected between the two second side plates 11, so that the battery module 2 can be limited in the first direction A. It can be understood that: the two ends of the limiting plate 14 are respectively fixed to the two second side plates 11 arranged relatively spaced apart, and the limiting plate 14 is arranged parallel to the first side plate 12 so that the side of the limiting plate 14 can limit the large surface of the battery module 2 in the first direction A. In some embodiments, the limiting plate 14 is used to limit the large surface of the battery module 2. The support beam 13 is a component arranged at the bottom of the limiting plate 14 and can be used to support the battery module 2. The hollow structure 17 can be understood as empty, without any connecting parts or structures.

[0054] In some embodiments, both ends of the limiting plate 14 are rigidly connected to the second side plate 11 , and the bottom of the limiting plate 14 is rigidly connected to the support beam 13 .

[0055] In the technical solution of the embodiment of the present application, a limit plate 14 is arranged in a accommodating space 100 which is enclosed by connecting the adjacent first side plate 12 and the second side plate 11 end to end in sequence, so that the battery module 2 is limited in the first direction A by the limit plate 14, and a support beam 13 extending along the first direction A is arranged at the bottom of the limit plate 14, and the battery module 2 is supported by the support beam 13, and a hollow structure 17 is formed between two adjacent support beams 13 or between the support beam 13 and the bottom of the adjacent second side plate 11, thereby reducing the parts of the box body and making the box body meet the lightweight requirements. At the same time, the arrangement of the limit plate 14 and the support beam 13 can also make the box body meet the high strength requirements.

[0056] In some embodiments, the number of the limiting plates 14 is at least one. The number of the limiting plates 14 can be one, two, three, four, five or even more. The limiting plates 14 are provided to improve the strength of the battery pack body while limiting the battery module 2 installed in the accommodating space 100. The number of limiting plates 14 can be set according to the size or number of the battery module 2 or the battery cells 20 in the battery module 2 in the first direction A to meet the requirement of limiting the large surface of the battery module 2 along the first direction A.

[0057] In some embodiments, when the number of the limiting plate 14 is one, the limiting plate 14 divides the accommodation space 100 into the electrical area 16 and the battery module area 18. When the number of the limiting plate 14 is more than one, one of the limiting plates 14 divides the accommodation space 100 into the electrical area 16 and the battery module area 18, and the other limiting plates 14 divide the battery module area 18 into a plurality of battery sub-module areas. The electrical area 16 is an area for installing electrical components, and the battery module area 18 is an area for installing battery modules 2. Please refer to Figure 1 or Figure 2 For example, when there are two limiting plates 14 , one limiting plate 14 divides the accommodating space 100 into an electrical area 16 and a battery module area 18 , and the other limiting plate 14 divides the battery module area 18 into a first battery submodule area 181 and a second battery submodule area 182 .

[0058] In the technical solution of the embodiment of the present application, through the above-mentioned setting, a limiting plate 14 divides the accommodating space 100 into an electrical area 16 and a battery module area 18, so that the electrical area 16 and the battery module area 18 are separated by the limiting plate 14, and it is not easy for the battery module 2 in the battery module area 18 to affect the electrical components in the electrical area 16, thereby affecting the service life of the battery pack.

[0059] In some embodiments, please refer to Figure 3 The limiting plate 14 has a hollow cavity inside, and a plurality of partitions 141 are arranged in the hollow cavity at equal intervals along the width direction of the limiting plate 14, so that the inside of the limiting plate 14 is divided into a plurality of cavities 142 along the width direction of the limiting plate 14. The side wall of the limiting plate 14 is a planar structure, and there is no weak treatment in the thickness direction of the limiting plate 14, so that the limiting plate 14 can have a better effect when bearing the later expansion force of the battery cell, and is not easily damaged due to excessive local stress of the limiting plate 14.

[0060] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4, the number of the support beam 13 is at least one, and the at least one support beam 13 separates each battery submodule area at an equal distance along the second direction B. In some embodiments, the number of the support beam 13 can be one, two, three, four or even more.

[0061] At least one support beam 13 divides each battery submodule area at an equal distance along the second direction B so that the bottom of the battery cell 21 located in each battery submodule area can be supported on the support beam 13. When the number of the support beam 13 is one, one side of the bottom of the battery cell 21 in each battery submodule area is supported on the support beam 13, and the other side of the bottom is supported on the second side plate 11. When the number of the support beams 13 is more than two, the bottom of the battery cell 21 in each battery submodule area is supported between two adjacent support beams 13, or between the support beam 13 and the second side plate 11, to ensure that the support beam 13 can stably support the bottom of the battery cell 21.

[0062] In some embodiments, the length of the support beam 13 at least runs through all the battery submodule areas so as to be able to support the battery cells located in the battery module area 18. For example, please refer to Figure 4 The support beam 13 can extend from the limiting plate 14 used to separate the electrical area 16 and the battery module area 18 through the first battery sub-module area 181 and the second battery sub-module area 182 to the bottom of the first side plate 12 on the opposite side, thereby realizing that the support beam 13 is located at the bottom of the battery module 2 to support the battery module 2.

[0063] In some embodiments, please refer to Figure 4 A support plate 19 is provided at the bottom of the electrical area 16 for supporting the electrical components in the electrical area 16 .

[0064] In some embodiments, please refer to Figure 2 A load-bearing beam 15 is also provided at the bottom of the second side plate 11 in the battery module area 18 on the side facing the battery module 2, and a hollow-bottomed accommodating cavity for accommodating the battery module 2 is formed between the load-bearing beam 15, the support beam 13 and the limit plate 14 in the battery module area 18, or between two adjacent support beams 13 and the limit plate 14.

[0065] Among them, the load-bearing beam 15 and the support beam 13 are located on the same horizontal plane, that is, the horizontal heights of the two are consistent. And the load-bearing beam 15 is spaced apart from its adjacent support beam 13. The hollow bottom accommodation cavity for accommodating the battery cell 20 of the battery module 2 is formed between the load-bearing beam 15 and the support beam 13 or between two adjacent support beams 13 in the battery module area 18. It can be understood that: at a position close to the second side plate 11, the accommodation cavity is composed of the load-bearing beam 15, the support beam 13 and the limit plate 14 at the front end and the rear end at the bottom, or the load-bearing beam 15, the support beam 13 and the limit plate 14 at the front end and the first side plate 12 at the rear end at the position; at a position far from the second side plate 11, the accommodation cavity is composed of two support beams 13 relatively spaced apart at the bottom and the limit plate 14 at the front end and the rear end at the bottom, or the two support beams 13 relatively spaced apart at the bottom and the limit plate 14 at the front end and the second side plate 12 at the rear end. Since the load-bearing beam 15 and the supporting beam 13 or two adjacent supporting beams 13 are arranged at intervals, the bottom of the accommodating cavity is a hollow structure.

[0066] In the technical solution of the embodiment of the present application, through the above-mentioned arrangement, the battery cell 20 of the battery module 2 can be installed in the accommodating cavity. The accommodating cavity with a hollow bottom can not only support the battery cell 20, but also make the battery pack box lightweight and improve the strength of the battery pack box.

[0067] Second, please refer to Figures 5 to 9 The present application also provides a battery pack, including a battery module 2 and the battery pack case 1 described in the first aspect, the battery module 2 including at least one group of battery cells 20, each group of battery cells 20 including a plurality of battery cells 21, and the plurality of battery cells 21 are arranged side by side along the thickness direction; each group of battery cells 20 is arranged in each accommodating cavity in such a way that the poles of the battery cells 21 face the hollow structure 17.

[0068] The battery cell 21 is the smallest unit of the battery pack. A plurality of battery cells 21 are stacked in a predetermined direction, for example Figure 5 In the illustrated manner, a plurality of battery cells 21 are arranged side by side in the thickness direction.

[0069] In the technical solution of the embodiment of the present application, through the above arrangement, each group of battery units 20 is arranged in each accommodating cavity of the battery pack box in a manner that the poles of the battery cells 21 face the hollow structure 17, so that the poles of the battery cells 21 are connected to the CCS assembly 60, so that the battery cells 21 can be connected in series, in parallel, or in mixed connection. This arrangement can save the length and space occupied by the low-voltage wiring harness in the CCS assembly to the greatest extent, and improve the integration of the battery pack.

[0070] In some embodiments, the battery cells 20 may include two or more groups, and the two or more groups of battery cells 20 are arranged side by side along the second direction B of the battery pack body 1.

[0071] In some embodiments, please refer to Figure 6 The battery cell 20 also includes: a first elastic spacer 22 and a second elastic spacer 23, the first elastic spacer 22 is arranged between two adjacent battery cells 21 along the thickness direction; the second elastic spacer 23 is arranged at the outermost side of the battery cell 20 along the thickness direction; the compression amount of the first elastic spacer 22 and the second elastic spacer 23 when compressed is 10% to 60%.

[0072] The first elastic spacer 22 and the second elastic spacer 23 can both be structural members with certain elastic compression performance. The first elastic spacer 22 is arranged between the large surfaces of two adjacent battery cells 21 and contacts the large surfaces of the battery cells 21. The second elastic spacer 23 is arranged at the outermost side of the entire battery unit 20 and contacts the large surface of the outermost battery cell 21.

[0073] In the technical solution of the embodiment of the present application, through the above-mentioned setting, the first elastic spacer 22 can isolate the adjacent battery cells 21, and when one of the battery cells 21 has thermal runaway, it can effectively block its heat from being transferred to the adjacent battery cells 21, and it is not easy for the heat to spread in the entire battery module. The second elastic spacer 23 can play an insulating role to isolate the battery cells 20 from the battery cells 20 or from the electrical components. At the same time, the first elastic spacer 22 and the second elastic spacer 23 can play a buffering role to reduce the impact of the expansion and contraction of the battery cells 21 during the charging and discharging process.

[0074] In some embodiments, the area of ​​the first elastic spacer 22 is S1, and the area of ​​the large surface of the battery cell 21 is S0, which satisfies: 80% S0≤S1≤95% S0. That is, the area S1 of the first elastic spacer 22 is slightly smaller than the area S0 of the large surface of the battery cell 21. The large surface of the battery cell 21 may be the side surface of the battery cell 21 along the thickness direction.

[0075] In the technical solution of the embodiment of the present application, through the above-mentioned configuration, it is not easy for the first elastic spacer 22 to exceed the boundary of the battery cell 21 in the compressed state, thereby affecting the installation of other components.

[0076] In some embodiments, please refer to Figure 7The first elastic spacer 22 includes an outer frame 221 and a spacer plate 222. The outer frame 221 is arranged on the outer periphery of the spacer plate 222. In the thickness direction of the first elastic spacer 22, the side of the outer frame 221 protrudes from the side of the spacer plate 222, and the length of the side of the outer frame 221 protruding from the side of the spacer plate 222 is 4-10mm.

[0077] Among them, the outer frame 221 is arranged around the partition plate 222. The material of the outer frame 221 can be silicone, silicone foam or aerogel. In the thickness direction of the first elastic spacer 22, the side of the outer frame 221 protrudes from the side of the partition plate 222, which can be understood as: on both sides of the large surface of the first elastic spacer 22 contacting the battery cell 21, the side of the outer frame 221 protrudes from the side of the partition plate 222. In some embodiments, the hardness of the outer frame 221 can be between Shore A40-60. The compression amount of the outer frame 221 when compressed is 10% to 60%. When compressed to the design value, the stress δ of the outer frame 221 multiplied by the area S1 of the first elastic spacer 22, that is, δ·S1≥2000N.

[0078] In the technical solution of the embodiment of the present application, through the above-mentioned arrangement, the outer frame 221 can contact the large surface of the battery cell 21, so that it is as close as possible to the outer edge of the large surface of the battery cell 21. The outer frame 221 has a higher rigidity and is not easy to cause the large surface of the battery cell 21 to deform when the first elastic spacer 22 is compressed.

[0079] In some embodiments, the edge of the larger surface of the battery cell 21 protrudes from the outer frame 221 of the first elastic spacer 22 , and the length of the edge of the larger surface of the battery cell 21 protruding from the outer frame 221 of the first elastic spacer 22 is 0.5-3 mm.

[0080] In the technical solution of the embodiment of the present application, the edge of the large surface of the battery cell 21 is made to protrude from the outer frame 221 of the first elastic spacer 22, and the length of the large surface edge of the battery cell 21 protruding from the outer frame 221 of the first elastic spacer 22 is 0.5-3mm. This allows the first elastic spacer 22 to effectively space the large surfaces of two adjacent battery cells 21, and at the same time, it is not easy for the first elastic spacer 22 to exceed the boundary of the battery cell 21 in a compressed state, thereby affecting the installation of other components.

[0081] In some embodiments, the area S2 of the second elastic spacer 23 is larger than the large surface area S0 of the battery cell 21 .

[0082] In some embodiments, the dielectric strength of the second elastic spacer 23 is greater than 16 kV / m, the withstand voltage meets 2500V-3800V for 60s DC, and the leakage current is less than 1 mA. In some embodiments, the material of the second elastic spacer 23 can be PC, silicone rubber or PA.

[0083] In the technical solution of the embodiment of the present application, by making the area S2 of the second elastic spacer 23 larger than the large surface area S0 of the battery cell 21, it is not easy for the battery cell 21 to contact with the limit plate 14 when close to the limit plate 14 and cause wear, and it can also play an insulating role.

[0084] In some embodiments, the roughness of the side of the second elastic spacer 23 facing the battery cell 21 is greater than the roughness of the side thereof away from the battery cell 21 .

[0085] In some embodiments, the side of the second elastic spacer 23 facing the battery cell 21 can be processed by frosting, and its roughness μ1≥0.4, preferably, 0.4≤μ1≤0.75. The side of the second elastic spacer 23 away from the battery cell 21 can be processed by polishing, and its roughness μ2<0.4, preferably, 0.2≤μ2<0.4.

[0086] In the technical solution of the embodiment of the present application, the battery cell 21, the first elastic spacer 22 and the second elastic spacer 23 are installed in a stacked manner and placed in the battery pack box 1. Since the second elastic spacer 23 is in contact with the limiting plate 14, the roughness of this side is relatively small, which is more conducive to the pressing in of the outermost battery cell 21 and reduces friction. The roughness of the side close to the battery cell 21 is relatively large, which can increase the friction between the battery cell 21 and the battery cell, thereby improving the preload force of the battery cell.

[0087] In some embodiments, the second elastic spacer 23 may be an integral structure. In some embodiments, the second elastic spacer 23 may also include an outer frame 221 and a spacer plate 222, wherein the outer frame 221 is disposed on the periphery of the spacer plate 222, and in the thickness direction of the second elastic spacer 23, the side of the outer frame 221 protrudes from the side of the spacer plate 222, and the length of the side of the outer frame 221 protruding from the side of the spacer plate 222 is not less than 1 mm. In some embodiments, the length of a single side of the outer frame 221 protruding from the side of the spacer plate 222 is 2-4 mm. The outer frame 221 of the second elastic spacer 23 protrudes from the edge of the large surface of the battery cell 21, and the length of the outer frame 221 of the second elastic spacer 23 protruding from the edge of the large surface of the battery cell 21 is 1-5 mm.

[0088] When the second elastic spacer 23 also includes an outer frame 221 and a spacer plate 222 , the roughness of the side of the outer frame 221 of the second elastic spacer 23 facing the battery cell 21 is greater than the roughness of the side away from the battery cell 21 .

[0089] Before the first elastic spacer 22 is compressed, the length of the battery cell 20 is greater than the length of the battery pack housing cavity. The assembly method of the battery cell 20 can be: first place the second elastic spacer 23 on the side close to the rear limit plate 14, then place the battery cell 21, and then place the first elastic spacer 22, and stack them in sequence. When close to the front limit plate 14, when only one battery cell 21 is left to be installed, the second elastic spacer 23 is attached to the battery cell 21, inserted obliquely into the gap, and then the battery cell 21 and the second elastic spacer 23 are pressed to the assembly position by the vertical pressure perpendicular to the bottom surface of the battery pack housing 1, and the side of the second elastic spacer 23 with less roughness contacts the limit plate 14 to reduce the friction during assembly. The assembly process of the embodiment of the present application can reduce the assembly process of the battery pack and achieve the purpose of reducing costs.

[0090] In some embodiments, please refer to Figure 8 The battery pack also includes: a CCS assembly 60, a first cooling structure 80, a first heat-conducting insulating layer 70, a second cooling structure 40 and a second heat-conducting insulating layer 30. The CCS assembly 60 is connected to the pole of the battery cell 21, and is used to electrically connect the battery cell 21 and collect signals from each battery cell 21; the first cooling structure 80 is arranged on the side of the CCS assembly 60 away from the battery module 2, and is used to cool the CCS assembly 60; the first heat-conducting insulating layer 70 is arranged between the first cooling structure 80 and the CCS assembly 60; the second cooling structure 40 is arranged on the side of the battery module 2 away from the pole, and is used to cool the side of the battery module 2 away from the pole; the second heat-conducting insulating layer 30 is arranged between the battery module 2 and the second cooling structure 40.

[0091] Among them, the CCS component 60 is a device for electrically connecting the battery cells 21 in each group of battery units 20, collecting the sampling signals of each battery cell 21, and transmitting the sampling signals to the battery management unit. The CCS component includes a bus group and a signal acquisition component. The bus group is used to connect the positive and negative poles of adjacent battery cells 21 so as to realize the series connection, parallel connection or mixed connection between the battery cells 21. Mixed connection means that multiple battery cells 21 are both connected in series and in parallel. The signal acquisition component is used to collect the sampling signals of each battery cell 21. The sampling signals can be electrical signals that characterize the working parameters of the battery cell 21, such as: voltage signals, temperature signals, internal resistance signals, etc. The first cooling structure 80 and the second cooling structure 40 can be cooling plates. The first thermally conductive insulating layer 70 and the second thermally conductive insulating layer 30 can be plates made of materials having both thermal conductivity and insulation properties.

[0092] In the technical solution of the embodiment of the present application, a first cooling structure 80 is arranged on the side of the CCS assembly 60 away from the battery module 2, and a second cooling structure 40 is also arranged on the side of the battery module 2 away from the pole, so that when the battery cell 21 generates heat, the heat can be quickly dissipated from two directions, so that the battery cell 21 can operate within a suitable temperature range, thereby improving the thermal management capability of the battery pack.

[0093] In some embodiments, the battery cells 20 are arranged in n groups (n≥1) along the second direction B, and the CCS components 60 are also arranged in n groups accordingly, so as to save the length and space occupied by the low-voltage wiring harness to the greatest extent.

[0094] In some embodiments, please refer to Figure 8 The battery pack further includes a bottom guard plate 90 located below the first cooling structure 80, and the circumferential edge of the bottom guard plate 90 is fixed to the bottom circumferential edge of the battery pack case 1. The battery pack further includes a top guard plate 50 located on top of the second cooling structure 40, and the circumferential edge of the top guard plate 50 is fixed to the top circumferential edge of the battery pack case 1, so that the components inside the battery pack case are protected by the bottom guard plate 90 and the top guard plate 50.

[0095] In a third aspect, the present application further provides an electric device, including the battery pack described in the second aspect. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0096] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack box for mounting a battery module (2), characterized in that: include: A frame (10) comprising two first side panels (12) arranged at intervals relative to each other along a first direction (A) and two second side panels (11) arranged at intervals relative to each other along a second direction (B), wherein adjacent first side panels (12) and second side panels (11) are connected end to end in sequence to enclose a receiving space (100); a limiting plate (14), disposed in the accommodating space (100), extending along the second direction (B) and connected between the two second side plates (11) to limit the battery module (2) in the first direction (A); and A support beam (13), the support beam (13) extending along the first direction (A) and arranged at the bottom of the limiting plate (14), used for supporting the battery module (2), and forming a hollow structure (17) between two adjacent support beams (13) or between the support beam (13) and the bottom of the adjacent second side plate (11).

2. The battery pack case according to claim 1, characterized in that: The number of the limiting plate (14) is at least one; When the number of the limiting plate (14) is one, the limiting plate (14) divides the accommodating space (100) into an electrical area (16) and a battery module area (18); When the number of the limiting plates (14) is more than one, one of the limiting plates (14) divides the accommodating space (100) into an electrical area (16) and a battery module area (18), and the other limiting plates (14) divide the battery module area (18) into a plurality of battery submodule areas.

3. The battery pack case according to claim 2, characterized in that: The number of the support beam (13) is at least one, and the at least one support beam (13) separates each of the battery submodule areas at an equal distance in the second direction (B).

4. The battery pack case according to claim 2 or 3, characterized in that: A load-bearing beam (15) is also provided at the bottom of the second side plate (11) in the battery module area (18) on the side facing the battery module (2), and a hollow-bottomed accommodation cavity for accommodating a battery unit (20) of the battery module (2) is formed between the load-bearing beam (15) and the support beam (13) in the battery module area (18) or between two adjacent support beams (13).

5. A battery pack, characterized in that: include: A battery module (2) comprises at least one group of battery cells (20), each group of battery cells (20) comprises a plurality of battery cells (21), and the plurality of battery cells (21) are arranged side by side in a thickness direction; and According to the battery pack case (1) as claimed in any one of claims 1 to 4, each group of the battery cells (20) is arranged in each accommodating cavity of the accommodating space (100) in a manner that the poles of the battery cells (21) face the hollow structure (17).

6. The battery pack according to claim 5, characterized in that: The battery unit (20) further comprises: A first elastic spacer (22) is arranged between two adjacent battery cells (21) along the thickness direction; A second elastic spacer (23) is arranged at the outermost side of the battery unit (20) along the thickness direction; The compression amount of the first elastic spacer (22) and the second elastic spacer (23) when compressed is 10% to 60%.

7. The battery pack according to claim 6, characterized in that: The area of ​​the first elastic spacer (22) is S1, and the large surface area of ​​the battery cell (21) is S0, satisfying: 80% S0≤S1≤95% S0; The area S2 of the second elastic spacer (23) is larger than the large surface area S0 of the battery cell (21), and the roughness of the side of the second elastic spacer (23) facing the battery cell (21) is larger than the roughness of the side away from the battery cell (21).

8. The battery pack according to claim 7, characterized in that: The first elastic spacer (22) and the second elastic spacer (23) both comprise an outer frame (221) and a spacer plate (222); the outer frame (221) is arranged on the outer periphery of the spacer plate (222); in the thickness direction of the first elastic spacer (22) or the second elastic spacer (23), the side surface of the outer frame (221) protrudes from the side surface of the spacer plate (222); and the length of the side surface of the outer frame (221) protruding from the side surface of the spacer plate (222) is not less than 1 mm; The edge of the large surface of the battery cell (21) protrudes from the outer frame (221) of the first elastic spacer (22), and the length of the edge of the large surface of the battery cell (21) protruding from the outer frame (221) of the first elastic spacer (22) is 0.5-3 mm; The outer frame (221) of the second elastic spacer (23) is arranged to protrude from the edge of the large surface of the battery cell (21), and the length of the outer frame (221) of the second elastic spacer (23) protruding from the edge of the large surface of the battery cell (21) is 1-5 mm.

9. The battery pack according to claim 5, characterized in that: Also includes: A CCS component (60) connected to the pole of the battery cell (21) and used to electrically connect each of the battery cells (21) and collect signals from each of the battery cells (21); A first cooling structure (80) is arranged on a side of the CCS assembly (60) away from the battery module (2) and is used to cool the CCS assembly (60); A first heat-conducting insulating layer (70) is disposed between the first cooling structure (80) and the CCS assembly (60); A second cooling structure (40) is arranged on a side of the battery module (2) away from the pole; A second heat-conducting insulating layer (30) is arranged between the battery module (2) and the second cooling structure (40).

10. An electrical device, characterized in that: Comprising a battery pack as claimed in any one of claims 5 to 9.

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