Shell and battery pack

Abstract

The utility model relates to a shell and a battery pack, the shell is applied to the battery pack and accommodates a battery cell, and the shell comprises: a shell which defines an accommodating cavity; the plurality of separators are accommodated in the accommodating cavity, are convexly arranged on the bottom wall surface, used for bearing the battery cells, of the accommodating cavity, and are positioned between any two adjacent battery cells; the separator is provided with a first end and a second end in the length direction, the first end is fixedly connected with the bottom wall surface, the second end is a free end far away from the bottom wall surface, and the thickness of the first end is larger than that of the second end or the width of the first end is larger than that of the second end. In view of the fact that the separator is located between any two adjacent battery cells, the separator can enhance the structural strength of the shell, so that under the condition that one battery cell generates thermal runaway, the shell can be ensured to continuously keep a fixing effect on the battery cells, mutual contact between the battery cells due to inclination and thermal runaway diffusion are avoided, explosion or fire hazard is prevented, and the service life of the battery cell is prolonged. Therefore, the use safety of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, in particular to a shell and a battery pack comprising the shell. BACKGROUND

[0002] As an important energy storage device, the battery pack has a very wide application in the fields of new energy and aerospace. The battery pack is usually composed of a shell and a battery cell, and the battery cell is accommodated in the shell. Thermal runaway is the most serious safety accident of the battery pack. Thermal runaway is caused by internal short circuit or external short circuit, which leads to accumulation of a large amount of heat in the lithium ion battery cell in a short time, and causes decomposition of the positive and negative active materials and the electrolyte of the battery cell, resulting in fire and explosion of the lithium ion battery cell. The thermal runaway of one battery cell may also trigger the thermal runaway of the remaining battery cells. For the traditional battery pack, smoke alarm, temperature alarm, water cooling and other systems are usually used to control the fire and explosion after the thermal runaway occurs. However, the battery pack cannot effectively prevent thermal runaway from the source and the root, which will affect the safety of the battery pack. SUMMARY

[0003] One of the technical problems solved by the present application is how to improve the safety of the battery pack.

[0004] A shell is applied to a battery pack and accommodates a battery cell. The shell comprises:

[0005] an outer shell, which encloses a receiving cavity; and

[0006] a plurality of isolation pieces accommodated in the receiving cavity, and the isolation pieces are protrudingly arranged on a bottom wall surface of the receiving cavity for carrying the battery cell, and the isolation pieces are located between any two adjacent battery cells; the isolation piece has a first end and a second end in the length direction, the first end is fixedly connected with the bottom wall surface, and the second end is a free end arranged away from the bottom wall surface, and the thickness of the first end is greater than the thickness of the second end or the width of the first end is greater than the width of the second end.

[0007] In one of the embodiments, the isolation piece comprises a first isolation part and a second isolation part connected with each other at the ends, the first end is located at the first isolation part, the second end is located at the second isolation part, and the thickness of the first isolation part remains constant or gradually decreases, the thickness of the second isolation part gradually decreases, and the thickness of the connection between the first isolation part and the second isolation part is equal.

[0008] In one of the embodiments, the spacer comprises a first spacer part and a second spacer part connected to each other at their ends, the first end is located at the first spacer part, the second end is located at the second spacer part, the first spacer part gradually decreases in width from the first spacer part to the second spacer part along the length direction of the spacer, the second spacer part keeps constant in width, and the width of the connection between the first spacer part and the second spacer part is equal.

[0009] In one of the embodiments, a plurality of the spacers are arranged along the circumference of the battery cell and jointly form a limiting cavity for inserting the battery cell.

[0010] In one of the embodiments, a top wall surface of the accommodating cavity is arranged towards the bottom wall surface, a liquid injection hole is recessed on the top wall surface and communicates the accommodating cavity with the outside, and the liquid injection hole is used for injecting potting glue into the accommodating cavity.

[0011] In one of the embodiments, an inner side circumferential surface of the accommodating cavity is connected to the edges of the bottom wall surface and the top wall surface at the same time, an exhaust hole is recessed on the inner side circumferential surface and communicates the accommodating cavity with the outside, and the exhaust hole is closer to the bottom wall surface than to the free end of the spacer.

[0012] In one of the embodiments, the shell comprises a first shell and a second shell, the first shell comprises a top plate and a first side cylinder, the first side cylinder is arranged around the top plate, the second shell comprises a bottom plate and a second side cylinder, the second side cylinder is arranged around the bottom plate, the top plate and the bottom plate are arranged in a spaced manner, the bottom wall surface is located on the bottom plate, and the end portions of the first side cylinder and the second side cylinder abut each other.

[0013] In one of the embodiments, the first shell further comprises a first protruding column located in the accommodating cavity, the first protruding column is protrudingly arranged on the top plate; the second shell further comprises a second protruding column located in the accommodating cavity, the second protruding column is protrudingly arranged on the bottom plate; and the first protruding column and the second protruding column are bolted.

[0014] A battery pack comprises a battery cell and the shell as claimed in any one of the above embodiments, and the spacer is arranged between any two adjacent battery cells.

[0015] In one of the embodiments, a potting body is further included, and the potting body is filled in the gap between any two adjacent battery cells.

[0016] One technical effect of one embodiment of the present application is that, since the spacer is located between any two adjacent battery cells, and the thickness of the first end of the spacer is greater than the thickness of the second end, or the width of the first end is greater than the width of the second end, the spacer has reasonable structural strength, so that the spacer can enhance the structural strength of the shell on the one hand, and can ensure that the shell continues to fix the battery cell in the case of thermal runaway of the battery cell, avoid the battery cells from contacting each other and causing thermal runaway diffusion due to tilting, prevent explosion or fire from being triggered, thereby improving the safety of the battery pack in use. On the other hand, even if the battery cell expands under the action of thermal runaway, the spacer with reasonable structural strength is difficult to deform or tilt, which will effectively prevent the expanded battery cell from contacting other battery cells, thereby avoiding thermal runaway diffusion and further improving the safety of the battery pack in use. In addition, the second end of the spacer with smaller thickness can have a good guiding effect on the installation of the battery cell, thereby improving the assembly efficiency and accuracy of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A perspective structural schematic diagram of a battery pack is provided for one embodiment.

[0018] Figure 2 A plan structural schematic diagram of a battery pack is provided for one embodiment. Figure 1

[0019] Figure 3 An exploded structural schematic diagram of a battery pack is provided for one embodiment. Figure 1

[0020] Figure 4 A structural schematic diagram from another perspective is provided for one embodiment. Figure 3

[0021] Figure 5 A perspective cross-sectional structural schematic diagram of a battery pack is provided for one embodiment. Figure 1

[0022] Figure 6 A partial perspective cross-sectional structural schematic diagram of a battery pack including a second shell and a battery cell is provided for one embodiment. Figure 1

[0023] Figure 7 A partial perspective structural schematic diagram of a battery pack including a spacer is provided for one embodiment. Figure 1

[0024] Figure 8 A perspective cross-sectional structural schematic diagram is provided for one embodiment. Figure 7

[0025] Figure 9 A plan structural schematic diagram is provided for one embodiment. Figure 7

[0026] ​​​​​​​​The battery pack 10, the shell 20, the battery cell 30, the housing 100, the first shell 110, the top plate 111, the first side cylinder 112, the first convex column 113, the second shell 120, the bottom plate 121, the second side cylinder 122, the second convex column 123, the accommodating cavity 130, the bottom wall surface 131, the top wall surface 132, the liquid injection hole 132a, the inner side circumferential surface 133, the exhaust hole 133a, the spacer 200, the first spacer part 210, the first end 211, the second spacer part 220, the second end 221, the limiting cavity 230. DETAILED DESCRIPTION

[0027] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the embodiments described herein and illustrated in the drawings are only by way of example and should not be considered as limiting the scope of the present application.

[0028] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0030] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "installation", "connection", "connection", "fixation" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the present application, unless specifically defined otherwise, if there is a description of the first feature "on" or "below" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0032] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0033] Referring to Figure 1 , Figure 2 and Figure 3 , an embodiment of the present application provides a battery pack 10 comprising a shell 20 and a cell 30, the shell 20 comprising an outer shell 100 and a plurality of separators 200, the outer shell 100 enclosing a receiving cavity 130, the plurality of separators 200 being spaced apart and received in the receiving cavity 130, and the separators 200 being located between any two adjacent cells 30.

[0034] Referring to Figure 3 , Figure 4 and Figure 5In some embodiments, the shell 100 can be made of plastic material, and the shell 100 includes a first shell 110 and a second shell 120. The first shell 110 includes a top plate 111 and a first side cylinder 112. The top plate 111 can be substantially rectangular, and the first side cylinder 112 is connected to the periphery of the top plate 111 so that the first side cylinder 112 is protruded on the top plate 111 along the thickness direction of the top plate 111, and thus the first side cylinder 112 is arranged around the top plate 111. The second shell 120 includes a bottom plate 121 and a second side cylinder 122. The bottom plate 121 can be substantially rectangular, and the second side cylinder 122 is connected to the periphery of the bottom plate 121 so that the second side cylinder 122 is protruded on the bottom plate 121 along the thickness direction of the bottom plate 121, and thus the second side cylinder 122 is arranged around the bottom plate 121. The top plate 111 and the bottom plate 121 are spaced apart, and the end portions of the first side cylinder 112 and the second side cylinder 122 abut each other. In this way, the top plate 111, the first side cylinder 112, the bottom plate 121 and the second side cylinder 122 together form a receiving cavity 130. The bottom wall surface 131 of the receiving cavity 130 is located on the bottom plate 121, and the battery cell 30 is carried on the bottom wall surface 131, i.e. the bottom wall surface 131 supports the battery cell 30. In other embodiments, the top plate 111 and the bottom plate 121 can be circular or elliptical, etc.

[0035] Referring to Figure 4 , Figure 5 and Figure 6In some embodiments, the first shell 110 further comprises a plurality of first protruding columns 113, which are arranged on the top plate 111 and protrude from the top wall surface 132 of the accommodating cavity 130. The other end of the inner side surface 133 of the accommodating cavity 130 is connected to the periphery of the bottom wall surface 131, i.e., the inner side surface 133 is connected between the top wall surface 132 and the bottom wall surface 131. The top wall surface 132, the bottom wall surface 131, and the inner side surface 133 jointly define the boundary of the accommodating cavity 130. The second shell 120 further comprises a plurality of second protruding columns 123, which are arranged on the bottom plate 121 and protrude from the bottom wall surface 131. In the installation process, when the end portions of the first side cylinder 112 and the second side cylinder 122 abut against each other, the end portions of the first protruding columns 113 and the second protruding columns 123 can also abut against each other, and the first protruding columns 113 and the second protruding columns 123 can be fixed in a threaded connection manner, so as to realize the fixed connection relationship between the first shell 110 and the second shell 120. By arranging the first protruding columns 113 and the second protruding columns 123, the structural strength of the entire shell 100 can be improved to a certain extent.

[0036] If the isolation member 200 is not arranged, when the battery cell 30 generates thermal runaway, the temperature of the battery cell 30 will exceed 180°C, and the softening temperature of the shell 100 is usually about 100°C. Therefore, the shell 100 will soften when the battery cell 30 generates thermal runaway, thereby weakening the fixing effect of the shell 100 on the battery cell 30, causing the battery cell 30 to tilt and contact the adjacent battery cell 30, thereby causing the adjacent battery cell 30 to also generate thermal runaway under the action of short circuit, and finally leading to the spread of thermal runaway. Further, under the action of thermal runaway, a certain gas is generated inside the battery cell 30, so that the internal pressure of the battery cell 30 increases, causing the battery cell 30 to expand along the axial and radial directions thereof, i.e., the radial and axial dimensions of the battery cell 30 increase, so that the spacing between the two adjacent battery cells 30 decreases until disappearing. Therefore, the two expanded battery cells 30 contact each other, further causing the adjacent battery cells 30 to intensify the spread of thermal runaway under the action of short circuit. This will cause the battery pack 10 to explode or catch fire under the action of thermal runaway, and finally affect the safety of the battery pack 10 in use.

[0037] For the battery pack 10 in the above embodiments, since the spacer 200 is located between any two adjacent battery cells 30, the spacer 200 can enhance the structural strength of the shell 100 on the one hand, and can ensure that the shell 100 continues to fix the battery cells 30 in the case of thermal runaway of one battery cell 30, thereby avoiding the thermal runaway spreading among the battery cells 30 due to mutual contact, preventing explosion or fire, and improving the safety of the battery pack 10. On the other hand, even if the battery cell 30 expands under the action of thermal runaway, the spacer 200 is difficult to deform or tilt due to its reasonable structural strength, which will effectively prevent the expanded battery cell 30 from contacting other battery cells 30, thereby avoiding the thermal runaway spreading, and further improving the safety of the battery pack 10. It can be understood that the first and second protrusions 113 and 123 can also improve the structural strength of the entire shell 100, and can continue to play the fixing function of the shell 100 on the battery cells 30 in the case of thermal runaway of one battery cell 30, thereby avoiding the tilting of the battery cells 30 to cause the thermal runaway spreading, and further improving the safety of the battery pack 10.

[0038] Referring to Figure 7 , Figure 8 and Figure 9 , the X-axis direction represents the width direction of the spacer 200, the Y-axis direction represents the thickness direction of the spacer 200, and the Z-axis direction represents the length direction of the spacer 200. In some embodiments, the spacer 200 has a first end 211 and a second end 221, which are opposite ends in the length direction of the spacer 200. The first end 211 is fixedly connected to the bottom wall surface 131 of the accommodating cavity 130, and the second end 221 is a free end away from the bottom wall surface 131. The width of the first end 211 is greater than the width of the second end 221, for example, the width of the first end 211 can be twice the width of the second end 221. The thickness of the first end 211 is greater than the thickness of the second end 221, for example, the thickness of the first end 211 can be twice the thickness of the second end 221. The width of the second end 221 can be about 6 mm, and the thickness of the second end 221 can be about 1.6 mm. In this way, the structural strength of the spacer 200 itself can be reasonably enhanced, and the connection strength between the spacer 200 and the bottom wall surface 131 can be increased. In the case of thermal runaway of one battery cell 30, the spacer 200 can continue to maintain a vertical state with the bottom wall surface 131, thereby avoiding the spacer 200 tilting relative to the bottom wall surface 131, and preventing the battery cell 30 from tilting relative to the bottom wall surface 131 to contact other battery cells 30 to cause thermal runaway spreading, thereby improving the safety of the battery pack 10.

[0039] Referring to Figure 7 , Figure 8 and Figure 9In some embodiments, the spacer 200 comprises a first spacer portion 210 and a second spacer portion 220, the ends of both the first spacer portion 210 and the second spacer portion 220 are connected to each other, the first end 211 is located at the first spacer portion 210, and the second end 221 is located at the second spacer portion 220, that is, the first spacer portion 210 is connected to the bottom wall surface 131, and the second spacer portion 220 is connected to the end of the first spacer portion 210 away from the bottom wall surface 131. In the length direction of the spacer 200 from the first spacer portion 210 to the second spacer portion 220, the thickness E of the first spacer portion 210 remains constant or gradually decreases, so that the cross section of the first spacer portion 210 extending in the thickness direction is rectangular or trapezoidal; the thickness e of the second spacer portion 220 gradually decreases, so that the cross section of the second spacer portion 220 extending in the thickness direction is trapezoidal, and the angle between the two outer surfaces in the thickness direction of the second spacer portion 220 can be about 4°. The thicknesses of the connection portions of the first spacer portion 210 and the second spacer portion 220 are equal. In the length direction of the spacer 200 from the first spacer portion 210 to the second spacer portion 220, the width D of the first spacer portion 210 gradually decreases, so that the cross section of the first spacer portion 210 extending in the width direction is trapezoidal; the width d of the second spacer portion 220 remains constant, so that the cross section of the second spacer portion 220 extending in the width direction is rectangular. The widths of the connection portions of the first spacer portion 210 and the second spacer portion 220 are equal. In this way, the structural strength of the spacer 200 itself and the connection strength between the spacer 200 and the bottom wall surface 131 can be further enhanced, effectively preventing the battery cell 30 from being inclined relative to the bottom wall surface 131 to contact other battery cells 30 to cause thermal runaway diffusion, thereby further improving the safety of the battery pack 10 in use.

[0040] Referring to Figure 5 and Figure 6 In some embodiments, a plurality of spacers 200 are arranged at intervals in the circumferential direction of the battery cell 30, so that a plurality of battery cells 30 collectively enclose a limiting cavity 230, the limiting cavity 230 is shaped to match the shape of the battery cell 30, for example, when the battery cell 30 is cylindrical, the limiting cavity 230 is also cylindrical, and a part of the battery cell 30 is inserted into the limiting cavity 230. One surface of the first spacer portion 210 and the second spacer portion 220 in the thickness direction defines the boundary of the limiting cavity 230. Obviously, the number of limiting cavities 230 is equal to and corresponds to the number of battery cells 30, and different battery cells 30 are inserted into different limiting cavities 230.

[0041] If the mode of directly opening the limiting hole on the bottom plate 121 is adopted, the battery cell 30 is inserted in the limiting hole, in order to achieve good guiding effect, avoid the battery cell 30 from being inclined in the assembly process, the depth of the limiting hole needs to be about 1 / 4-1 / 3 of the length of the battery cell 30, so the depth of the limiting hole is large, which makes the thickness of the bottom plate 121 large, thereby increasing the weight and manufacturing cost of the shell 100 and the entire battery pack 10.

[0042] For the battery pack 10 in the above embodiment, in view of the spacer 200 arranged at intervals can surround the limiting cavity 230, thereby avoiding opening the limiting hole on the bottom plate 121, thereby reducing the thickness and weight of the bottom plate 121, it can be understood that the weight increased by the spacer 200 will be less than the weight reduced by the bottom plate 121, so the total weight of the entire shell 100 and the battery pack 10 will still be reduced, and the manufacturing cost of the shell 100 and the entire battery pack 10 can also be reduced. Of course, in the case that the cross section of the second isolation part 220 extending in the thickness direction is trapezoidal, the second isolation part 220 forms a wedge-shaped block, when the battery cell 30 is inserted into the limiting cavity 230, the second isolation part 220 as a wedge-shaped block can play a good guiding role on the battery cell 30, thereby improving the assembly efficiency and assembly precision of the battery cell 30.

[0043] Referring to Figure 5 In some embodiments, the top wall surface 132 is recessed to form a liquid injection hole 132a, obviously, the liquid injection hole 132a is arranged on the top plate 111, the liquid injection hole 132a is a through hole penetrating through the top plate 111 along the thickness direction of the top plate 111, so that the liquid injection hole 132a communicates with the outside and the accommodation cavity 130. The liquid injection hole 132a is used for injecting the potting glue into the accommodation cavity 130, after the potting glue fills the entire accommodation cavity 130, the potting glue will solidify to form an insulating potting body, so the battery pack 10 can also include a potting body, which is filled in the gap between any two adjacent battery cells 30. It can be understood that the potting body will fill the space in the entire accommodation cavity 130 which is not filled by other components such as the battery cell 30. Therefore, by arranging the potting body, on the one hand, the strength of the shell 100 can be enhanced, and the isolation effect of the battery cell 30 can be further improved to avoid the battery cells 30 from contacting each other due to inclination to cause heat runaway diffusion. On the other hand, the potting body has reasonable heat conduction performance, so the potting body can play a heat conduction role to ensure that the heat is evenly distributed in the accommodation cavity 130, avoiding the local high temperature in the accommodation cavity 130 to cause the heat runaway of the battery cell 30. This will further improve the safety of the battery pack 10.

[0044] Referring to Figure 5In some embodiments, the inner circumferential surface 133 is concave to form an exhaust hole 133a, which can be arranged on the second side cylinder 122 and penetrates the second side cylinder 122 along the thickness direction of the second side cylinder 122, so the exhaust hole 133a is a through hole, and the exhaust hole 133a is in communication with the accommodating cavity 130 and the outside. The exhaust hole 133a is arranged close to the bottom wall surface 131, for example, the exhaust hole 133a is closer to the bottom wall surface 131 than the free end of the isolation piece 200. By arranging the exhaust hole 133a, during the process of injecting glue into the injection hole 132a, the potting glue will gradually fill the accommodating cavity 130, so that the air in the accommodating cavity 130 is discharged from the exhaust hole 133a under the extrusion of the potting glue, avoiding the phenomenon that the potting body after molding has holes, thereby improving the isolation effect of the potting body on the battery cell 30 and enhancing the structural strength of the shell 100.

[0045] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0046] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A case applied to a battery pack and housing a battery cell, characterized by, The shell comprises: an outer shell enclosing a receiving cavity; and a plurality of separators accommodated in the receiving cavity and protruding on a bottom wall surface of the receiving cavity for bearing the battery cells, the separators being located between any two adjacent battery cells; the separator has a first end and a second end in a length direction, the first end being fixedly connected to the bottom wall surface, and the second end being a free end away from the bottom wall surface, the thickness of the first end being greater than that of the second end or the width of the first end being greater than that of the second end.

2. The housing of claim 1, wherein The separator comprises a first separation part and a second separation part connected at their ends, the first end being located at the first separation part, and the second end being located at the second separation part, the thickness of the first separation part being constant or gradually decreasing, the thickness of the second separation part gradually decreasing, and the thickness of the connection between the first separation part and the second separation part being equal.

3. The case according to claim 1, characterized by The separator comprises a first separation part and a second separation part connected at their ends, the first end being located at the first separation part, and the second end being located at the second separation part, the width of the first separation part gradually decreasing, the width of the second separation part being constant, and the width of the connection between the first separation part and the second separation part being equal.

4. The housing according to any one of claims 1 to 3, characterized in that A plurality of the separators are arranged in a circumferential direction of the battery cells and collectively enclose a limiting cavity for inserting the battery cells.

5. The housing of any one of claims 1 to 3, wherein, A top wall surface of the receiving cavity is arranged towards the bottom wall surface, and a liquid injection hole is recessed on the top wall surface to communicate the receiving cavity with the outside, the liquid injection hole being used for injecting potting glue into the receiving cavity.

6. The housing of claim 5, wherein, An inner side circumferential surface of the receiving cavity is connected to edges of the bottom wall surface and the top wall surface, and an exhaust hole is recessed on the inner side circumferential surface to communicate the receiving cavity with the outside, the exhaust hole being closer to the bottom wall surface than the free end of the separator.

7. The case of claim 1, wherein, The shell comprises a first shell and a second shell, the first shell comprising a top plate and a first side cylinder arranged around the top plate, and the second shell comprising a bottom plate and a second side cylinder arranged around the bottom plate, the top plate and the bottom plate being spaced apart, the bottom wall surface being located on the bottom plate, and the end portions of the first side cylinder and the second side cylinder abutting each other.

8. The case according to claim 7, characterized in that The first shell further comprises a first protruding column in the receiving cavity, the first protruding column protruding on the top plate; the second shell further comprises a second protruding column in the receiving cavity, the second protruding column protruding on the bottom plate; and the first protruding column and the second protruding column are bolted.

9. A battery pack, characterized by, The battery cell and the shell of any one of claims 1 to 8 are included, and the separators are located between any two adjacent battery cells.

10. The battery pack of claim 9, wherein, A potting body is further included, the potting body being filled in the gap between any two adjacent battery cells.

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