Battery cell shell

Abstract

The utility model provides a battery cell shell, the material of the battery cell shell is steel, the battery cell shell comprises a first shell unit and a second shell unit, the first shell unit encloses to form a first accommodating cavity, the second shell unit encloses to form a second accommodating cavity, the edge of the first shell unit and the edge of the second shell unit abut against each other and are in welded connection, and the first shell unit and the second shell unit are in welded connection. And the first accommodating cavity is communicated with the second accommodating cavity. The material of the battery cell shell is changed into steel, so that the structural strength can be ensured on the premise that the thickness is reduced, the space utilization rate in the battery cell shell is improved, and the energy density of the manufactured battery cell is improved. The battery cell shell is formed by mutually welding and connecting the first shell unit and the second shell unit, and the first accommodating cavity and the second accommodating cavity are communicated to jointly accommodate the electrode assembly of the battery cell, so that the size of the whole battery cell shell can be increased under the condition that the processing size and the processing difficulty of parts are not increased, and the battery cell with a larger size can be manufactured.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery cell technical field, especially a kind of cell shell. BACKGROUND

[0002] At present, various kinds of cell shell including square battery are usually made of aluminum alloy, which has high wall thickness, low strength and is not resistant to high temperature, cannot bear large pressure, is easy to be burned through seriously, has large risk of cell heat diffusion, and occupies cell use space. Although the cell shell made of steel including stainless steel can solve the problems of strength and high temperature resistance, the steel material is hard and difficult to process, and the production efficiency is low. SUMMARY

[0003] The utility model solves the technical problems that the cell shell in the prior art is difficult to process and has low production efficiency, and provides a cell shell.

[0004] The utility model solves the above technical problems by the following technical scheme:

[0005] A kind of cell shell, the material of the cell shell is steel, the cell shell includes first shell unit and second shell unit, the first shell unit is surrounded to form first containing cavity, the second shell unit is surrounded to form second containing cavity, the first shell unit and the second shell unit edge abut and are welded to connect, to make the first containing cavity and the second containing cavity communicate.

[0006] The structure setting scheme, the material of the cell shell is replaced by steel material instead of aluminum alloy, which can ensure the structural strength under the premise of thickness thinning, thereby improving the space utilization rate inside the cell shell, and further improving the energy density of the manufactured cell.

[0007] Meanwhile, the cell shell is formed by welding the first shell unit and the second shell unit, the first containing cavity of the first shell unit and the second containing cavity of the second shell unit communicate to jointly contain the electrode assembly of the cell, the cell shell is composed of two or more shell unit parts, which can increase the size of the entire cell shell without increasing the processing size and difficulty of the parts, and manufacture larger size cell. Since the steel material has high strength and is difficult to process, this scheme of splitting the cell shell for manufacturing enables the processing technology of the original large-size steel material cell shell to also achieve the manufacturing of the cell shell. For example, the stamping process has a processing size limit, and the shell with too large size cannot be manufactured by the stamping process. By splitting the cell shell into two or more shell units, the shell units can be manufactured by the stamping process, and then welded and connected, effectively solving the problem that some processing technologies cannot process large-size steel material cell shell.

[0008] Alternatively, in the case of the unchanged size of the battery cell housing, the size of the parts constituting the single housing unit of the battery cell housing can be reduced to reduce the processing difficulty of the parts of the single housing unit, so that the housing unit can be realized by relatively low processing difficulty and high processing efficiency processes such as bending and stamping, which can improve the processing efficiency of the entire battery cell housing and reduce the processing difficulty.

[0009] Preferably, the first housing unit comprises at least one first housing connected head-to-tail, the first housing surrounding the first accommodating cavity, and the second housing unit comprises at least one second housing connected head-to-tail, the second housing surrounding the second accommodating cavity.

[0010] The edge of the first housing abuts and is welded to the edge of the second housing, and the first housing and the second housing jointly form the side surface of the battery cell housing.

[0011] The structure setting scheme, the first housing unit comprises a ring structure formed by at least one first housing connected head-to-tail, and the second housing unit comprises a ring structure formed by at least one second housing connected head-to-tail, which is beneficial to be processed by simple processes such as stamping.

[0012] At the same time, the first housing of the first housing unit and the second housing of the second housing unit jointly form the side surface of the battery cell housing by welding, and the welding position is not located at the corner position of the battery cell housing, avoiding the stress concentration of the battery cell housing at the welding position.

[0013] Preferably, the first housing is a planar structure, and a plurality of the first housings are connected head-to-tail and surround the first accommodating cavity.

[0014] The second housing is a planar structure, and a plurality of the second housings are connected head-to-tail and surround the second accommodating cavity.

[0015] In the structure setting scheme, the first housing and the second housing are surrounded by a plurality of planar structures, and the first housing unit and the second housing unit can form a polygonal battery cell housing after being welded, which can meet the requirements of different shapes of the battery cell.

[0016] Preferably, the number of the first housing and the second housing is four, and the battery cell housing is a rectangular housing.

[0017] In the structure setting scheme, the number of the first housing and the second housing is four, and the battery cell housing formed thereby is a rectangular housing. Therefore, it can adapt to the shapes of most electrode assemblies for accommodation at present, and the battery cell made of the battery cell housing can also meet the requirements of integrated layout.

[0018] Preferably, the edges of the first housings of the first housing unit are flush.

[0019] Preferably, edges of each of the second shells of the second shell unit are flush.

[0020] The structure arrangement facilitates the alignment of the two shell units during welding, while ensuring uniformity of welding and improving welding effect.

[0021] Preferably, an end of the first shell unit away from the second shell unit is closed to form an end face of the battery cell shell.

[0022] The structure arrangement forms the end face of the battery cell shell by closing an end of the first shell unit, without the need for an additional cover plate part to cover the end of the battery cell shell, thereby reducing the number of parts constituting the shell, lowering processing cost and improving processing efficiency.

[0023] Preferably, an end of the second shell unit away from the first shell unit is closed to form an end face of the battery cell shell.

[0024] The structure arrangement forms the end face of the battery cell shell by closing an end of the second shell unit, without the need for an additional cover plate part to cover the end of the battery cell shell, thereby reducing the number of parts constituting the shell, lowering processing cost and improving processing efficiency.

[0025] Preferably, a dimension of the first shell unit along a height direction of the battery cell shell is less than or equal to 400 mm.

[0026] The structure arrangement controls the dimension of the first shell unit along the height direction of the battery cell shell to be less than or equal to 400 mm, thereby reducing the difficulty of processing the first shell unit by stamping process.

[0027] Preferably, a dimension of the second shell unit along a height direction of the battery cell shell is less than or equal to 400 mm.

[0028] The structure arrangement controls the dimension of the second shell unit along the height direction of the battery cell shell to be less than or equal to 400 mm, thereby reducing the difficulty of processing the second shell unit by stamping process.

[0029] Preferably, the first shell unit comprises a first plane, a plurality of second planes and a third plane formed in sequence after circumferential bending, the first plane, the plurality of second planes and the third plane surrounding to form the first accommodating cavity, and the second shell unit comprises a fourth plane, a plurality of fifth planes and a sixth plane formed in sequence after circumferential bending, the fourth plane, the plurality of fifth planes and the sixth plane surrounding to form the first accommodating cavity.

[0030] The edge of the first plane away from the second plane is abutted and welded to the edge of the fourth plane away from the fifth plane, and the first plane and the fourth plane form one side of the battery cell shell;

[0031] The edge of the third plane away from the second plane is abutted and welded to the edge of the sixth plane away from the fifth plane, and the third plane and the sixth plane form the other side of the battery cell shell.

[0032] The structure setting scheme, the first shell unit includes a sheet structure formed by bending in the circumferential direction, and the second shell unit includes a sheet structure formed by bending in the circumferential direction, which is beneficial to be processed by simple processes such as sheet metal bending.

[0033] Meanwhile, the first plane of the first shell unit and the fourth plane of the second shell unit form a side of the battery cell shell by welding, avoiding the welding position at the corner position of the battery cell shell, thereby avoiding stress concentration at the welding position. Meanwhile, the third plane of the first shell unit and the sixth plane of the second shell unit form a side of the battery cell shell by welding, avoiding the welding position at the corner position of the battery cell shell, thereby avoiding stress concentration at the welding position.

[0034] Preferably, the first plane and the third plane of the first shell unit are flush.

[0035] Preferably, the fourth plane and the sixth plane of the second shell unit are flush.

[0036] The structure setting scheme facilitates the alignment of the two shell units during welding, while ensuring uniformity of welding and improving welding effect.

[0037] Preferably, the number of the second plane and the fourth plane is one, and the battery cell shell is a rectangular shell.

[0038] The structure setting scheme, the number of the second plane and the fourth plane is one, and the battery cell shell is a rectangular shell. Therefore, it can adapt to the shapes of most electrode assemblies for accommodation at present, and the battery cell made of the battery cell shell can also meet the demand of integrated layout.

[0039] Preferably, the first shell unit and the second shell unit have the same size.

[0040] The structure setting scheme, by making the size of the first shell unit and the second shell unit the same, facilitates batch processing, and can improve processing efficiency.

[0041] Preferably, the thickness of the first shell unit is less than or equal to 5mm.

[0042] This structural design controls the thickness of the first shell unit to be less than or equal to 5mm, thereby reducing the difficulty of processing the first shell unit through processes such as stamping and bending while meeting the shell strength requirements.

[0043] Preferably, the thickness of the second housing unit is less than or equal to 5 mm.

[0044] This structural design controls the thickness of the second shell unit to be less than or equal to 5mm, thereby reducing the difficulty of processing the first shell unit through processes such as stamping and bending while meeting the shell strength requirements.

[0045] The positive and progressive effects of this utility model are as follows:

[0046] The material of the battery cell casing has been changed to steel, which can ensure structural strength while reducing the thickness, improve the space utilization inside the battery cell casing, and increase the energy density of the battery cell.

[0047] By constructing a battery cell housing from two or more housing units, the overall size of the battery cell housing can be increased without increasing the machining dimensions or difficulty of the parts, thus enabling the manufacture of larger battery cells. This also makes it possible to manufacture battery cell housings using processes that were previously unable to produce large-sized steel battery cell housings (such as stamping processes).

[0048] Meanwhile, while keeping the size of the battery cell housing unchanged, the size of the parts in a single housing unit that makes up the battery cell housing can be reduced, which can reduce the difficulty of machining the parts in the housing unit and improve the machining efficiency of the entire battery cell housing. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the battery cell structure of Embodiment 1 of this utility model.

[0050] Figure 2 This is a schematic diagram of the battery cell housing of Embodiment 1 of this utility model.

[0051] Figure 3 This is a schematic diagram showing the positional relationship between the battery cell housing and the electrode assembly in Embodiment 1 of this utility model.

[0052] Figure 4 This is a schematic diagram of the structure of the first housing unit of Embodiment 1 of this utility model.

[0053] Figure 5 This is a schematic diagram of the battery cell housing in Embodiment 2 of this utility model.

[0054] Figure 6 This is a schematic diagram of the battery cell housing in Embodiment 3 of this utility model.

[0055] Figure 7 This is a schematic diagram of the structure of the first housing unit in Embodiment 4 of this utility model.

[0056] Figure 8 This is a schematic diagram of the structure of the second housing unit in Embodiment 4 of this utility model.

[0057] Figure 9 This is a schematic diagram of the battery cell housing in Embodiment 4 of this utility model.

[0058] Figure 10 This is a schematic diagram showing the positional relationship between the battery cell housing and the electrode assembly in Embodiment 4 of this utility model.

[0059] Figure 11 This is a schematic diagram of the battery cell housing in Embodiment 5 of this utility model.

[0060] Explanation of reference numerals in the attached figures:

[0061] Cell casing 1000, circumferential A

[0062] First housing unit 100, first receiving cavity 110

[0063] First shell 101

[0064] First plane 10, second plane 20, third plane 30

[0065] Second housing unit 200, second receiving cavity 210

[0066] Second shell 201

[0067] Fourth plane 40, fifth plane 50, sixth plane 60

[0068] Edge 300

[0069] Electrode terminals 2000

[0070] Injection port 3000

[0071] Explosion-proof sheet 4000

[0072] Electrode assembly 5000 Detailed Implementation

[0073] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0074] Example 1

[0075] like Figure 1As shown, this utility model provides a battery cell housing 1000 for accommodating an electrode assembly (not shown in the figure), and leading out the positive and negative electrodes of the electrode assembly from electrode terminals 2000 located on the surface of the housing. In addition, the surface of the battery cell housing 1000 is also provided with other structures such as a liquid injection hole 3000 and an explosion-proof sheet 4000 to realize other functions of the battery cell. Specifically, the battery cell housing 1000 of this utility model is made of steel, replacing the traditional aluminum alloy material. This ensures structural strength while reducing thickness, improves the space utilization rate inside the battery cell housing 1000, and increases the energy density of the manufactured battery cell. More preferably, 304 stainless steel can be used to obtain relatively better structural strength, greater corrosion resistance, and significantly improved durability.

[0076] To address the issue that steel is more difficult to process than commonly used materials for battery cell casings such as aluminum alloy, such as... Figure 2 and Figure 3 As shown, the battery cell housing 1000 of this utility model includes a first housing unit 100 and a second housing unit 200. The first housing unit 100 surrounds and forms a first receiving cavity 110, and the second housing unit 200 surrounds and forms a second receiving cavity 210. The edges 300 of the first housing unit 100 and the second housing unit 200 abut against each other and are welded together, so that the first receiving cavity 110 and the second receiving cavity 210 are in communication.

[0077] In this structural arrangement, the cell housing 1000 is connected to the first receiving cavity 110 of the first housing unit 100 and the second receiving cavity 210 of the second housing unit 200 to jointly accommodate the electrode assembly 5000 of the cell. The cell housing 1000 is composed of parts from two or more housing units. This allows for an increase in the overall size of the cell housing 1000 without increasing the processing size or difficulty of the parts, thus enabling the manufacture of larger cells.

[0078] Due to the high strength and processing difficulty of steel, this method of manufacturing the battery cell casing 1000 by disassembling it allows for the production of battery cell casings that were previously impossible using traditional processing techniques. For example, stamping processes have size limitations; casings that are too large cannot be manufactured using stamping. By disassembling the battery cell casing 1000 into two or more casing units, these units can be manufactured using stamping and then welded together, effectively solving the problem that some processing techniques cannot manufacture large-sized steel battery cell casings.

[0079] Furthermore, for the relatively small-sized battery cell housing 1000, this method of disassembling it into parts and then welding them together allows for a reduction in the size of the individual housing units that make up the battery cell housing 1000. This reduces the manufacturing difficulty of individual housing units while maintaining the same material and overall dimensions. The housing units can then be manufactured using relatively low-difficulty, high-efficiency processes such as bending and stamping, thereby improving the overall manufacturing efficiency of the battery cell housing 1000 and reducing its manufacturing complexity.

[0080] Specifically in this embodiment, such as Figure 4 As shown, the first housing unit 100 includes four first housings 101 connected end to end, which together form a first receiving cavity 110. Corresponding to the structure of the first housing unit 100, the second housing unit 200 is also formed by four second housings 201, which together form a second receiving cavity 210. Figure 2 As shown, the edge 300 of the first housing 101 abuts and is welded to the edge 300 of the second housing 201, so that the first housing 101 and the second housing 201 together form the side of the cell housing 1000. By making the first housing 101 and the second housing 201 surrounded by multiple planar structures, the first housing unit 100 and the second housing unit 200 can be welded together to form a polygonal cell housing 1000, which can meet different cell shape requirements. In this embodiment, the first housing unit 100 and the second housing unit 200 are formed by a stamping process.

[0081] Specifically, steel is harder than aluminum alloy, making it more difficult to stamp. Generally, it's difficult to process materials exceeding 400mm in height using stamping. In this embodiment, by dividing the cell housing 1000 into two parts, a first housing unit 100 and a second housing unit 200, the size of individual parts is reduced, thus simplifying the stamping process. Specifically, the first housing unit 100 and the second housing unit 200 are processed using a stamping process. The dimension H of the first housing unit 100 and the second housing unit 200 in the height direction (referring to the height direction of the cell and the cell housing 1000) is controlled to be less than or equal to 400mm. After welding the first housing unit 100 and the second housing unit 200 together, a large-size cell housing 1000 with a height of less than or equal to 800mm can be formed. More preferably, all external dimensions of the first housing unit 100 and the second housing unit 200, including the height dimension, should be identical, so that the first housing unit 100 and the second housing unit 200 can be processed separately using a single stamping process, further simplifying the manufacturing process.

[0082] In other embodiments, if the total height of the cell housing 1000 is greater than 800mm, then even if the cell housing 1000 is divided into two housing units with the same height dimension H along the height direction, it is difficult to process by stamping. In this case, the cell housing 1000 can be divided into three or more sections (i.e., multiple first housing units 100 or second housing units 200 are welded together) to further reduce the height of individual parts, so as to facilitate the manufacturing of large-sized cell housing 1000 by stamping and welding.

[0083] Specifically, in this embodiment, the cell housing 1000 is a rectangular housing. The rectangular shape can adapt to most of the electrode assembly shapes currently used for housing, and the cell made from this cell housing 1000 can also meet the requirements of integrated layout. Of course, in other embodiments, the number of the first housing 101 and the second housing 201 can also be set as needed according to the required shape of the cell housing 1000. For example, if there are three first housings 101 and two housings 201, the shape of the first housing unit 100 and the second housing unit 200 formed is triangular, and the cell housing 1000 formed after welding is also triangular. If there are six first housings 101 and two housings 201, the shape of the first housing unit 100 and the second housing unit 200 formed is hexagonal, and the cell housing 1000 formed after welding is also hexagonal.

[0084] like Figure 4 As shown, in this embodiment, the edges 300 of each first housing 101 of the first housing unit 100 are flush to ensure alignment of the first housing unit 100 relative to the second housing unit 200 during welding, thereby ensuring welding uniformity and improving welding effect. Corresponding to the shape of each first housing 101 of the first housing unit 100, the edges 300 of each second housing 201 of the second housing unit 200 should also be flush. When the first housing unit 100 and the second housing unit 200 are formed by stamping, due to the limitations of the stamping process's processing precision, the edges 300 of the stamped first housing unit 100 or the second housing unit 200 may not be completely flat. In this case, cutting processing can be used to ensure that the edges 300 of the first housing unit 100 or the second housing unit 200 are flat and flush.

[0085] In addition, from Figure 2As can be seen, the end of the second housing unit 200 furthest from the first housing unit 100 is completely closed to form the end face of the cell housing 1000. By closing one end of the second housing unit 200 to form the end face of the cell housing 1000, there is no need to additionally provide a cover plate to cover the end of the cell housing 1000, which reduces the number of parts constituting the outer casing, lowers processing costs, and improves processing efficiency. Correspondingly, the end of the first housing unit 100 furthest from the second housing unit 200 is also closed, similarly used to form the end face of the cell housing 1000. This bottom-closed annular structure can be achieved through a stamping process, or it can be achieved through other processes with low processing difficulty and high processing efficiency.

[0086] like Figure 4 As shown, in this embodiment, the thickness T of the first housing unit 100 is controlled to be less than or equal to 5 mm, so as to reduce the difficulty of processing the first housing unit 100 by processes such as stamping while meeting the housing strength requirements. Corresponding to the thickness of the first housing unit 100, the thickness of the second housing unit 200 is also controlled to be less than or equal to 5 mm.

[0087] Example 2

[0088] like Figure 5 As shown, this embodiment also provides a cell housing 1000, whose structure is roughly the same as that of the cell housing 1000 in Embodiment 1. The difference is that in this embodiment, the end of the second housing unit 200 away from the first housing unit 100 is not closed, but is open. This structural arrangement makes it convenient to insert the electrode assembly from the end of the second housing unit 200 after the welding of the second housing unit 200 and the first housing unit 100 is completed, and a top cover (not shown in the figure) is further provided to close the end of the second housing unit 200.

[0089] Example 3

[0090] like Figure 6 As shown, this embodiment also provides a cell housing 1000, whose structure is generally the same as that of the cell housing 1000 in Embodiment 1, except that: in this embodiment, the shape formed by the first housing unit 100 and the second housing unit 200 is circular, that is, the first housing unit 100 is formed by connecting the first and second ends of a non-planar first housing 101, and the second housing unit 200 is formed by connecting the first and second ends of a non-planar second housing 201. After the first housing unit 100 and the second housing unit 200 are welded together, a cylindrical cell housing 1000 is formed, which can be used to manufacture cylindrical cells.

[0091] The cylindrical first housing unit 100 and the second housing unit 200 can also be realized by stamping, or by other processes with low processing difficulty and high processing efficiency.

[0092] Example 4

[0093] This embodiment also provides a battery cell housing 1000, which is also formed by welding together a first housing unit 100 and a second housing unit 200. The difference from Embodiment 1 is the structure of the first housing unit 100 and the second housing unit 200 and the preferred processing technology.

[0094] Specifically, such as Figure 7 and Figure 8 As shown, the first housing unit 100 includes a first plane 10, a second plane 20, and a third plane 30 formed sequentially after being bent along the circumferential direction A, and the second housing unit 200 includes a fourth plane 40, a fifth plane 50, and a sixth plane 60 formed sequentially after being bent along the circumferential direction A. Here, the so-called circumferential direction A refers to the circumferential direction of the cell housing 1000. Figure 9 and Figure 10 As shown, the first housing unit 100 is bent to form a first receiving cavity 110, and the second housing unit 200 is bent to form a second receiving cavity 210. The edge of the first plane 10 away from the second plane 20 abuts and is welded to the edge of the fourth plane 40 away from the fifth plane 50. The first plane 10 and the fourth plane 40 form one side of the cell housing 1000. The edge of the third plane 30 away from the second plane 20 abuts and is welded to the edge of the sixth plane 60 away from the fifth plane 50. The third plane 30 and the sixth plane 60 form the other side of the cell housing 1000.

[0095] In this embodiment, the first housing unit 100 includes a sheet-like structure formed by bending along the circumferential direction A, and the second housing unit 200 includes a sheet-like structure formed by bending along the circumferential direction A, which facilitates processing through simple processes such as sheet metal bending. The first plane 10 and the fourth plane 40 are welded together to form the side surface of the cell housing 1000, and the third plane 30 and the sixth plane 60 are welded together to form the side surface of the cell housing 1000, avoiding the welding position being located at the corner of the cell housing 1000, thereby avoiding stress concentration at the welding position.

[0096] like Figure 7 and Figure 8As shown, the first plane 10 and the third plane 30 of the first housing unit 100 are flush, and the fourth plane 40 and the sixth plane 60 of the second housing unit 200 are flush, so as to facilitate alignment of the two housing units during welding, and at the same time ensure welding uniformity and improve welding effect. In addition, the first housing unit 100 and the second housing unit 200 have the same external dimensions, which facilitates batch processing and can improve processing efficiency.

[0097] In this embodiment, there is one second plane 20 and one fourth plane 40. The cell housing 1000 is a rectangular housing, which can be adapted to the shape of most electrode assemblies 5000 currently used for housing. The cell made by the cell housing 1000 can also meet the requirements of integrated layout.

[0098] Example 5

[0099] like Figure 11 As shown, this embodiment also provides a cell housing 1000, whose structure is roughly the same as that of the cell housing 1000 in embodiment 4. The difference is that in this embodiment, there are multiple second planes 20 and four planes 40, specifically two. Therefore, the cross-section of the cell housing 1000 formed by welding the first housing unit 100 and the second housing unit 200 is not rectangular, but hexagonal. Of course, in other embodiments, the number of second planes 20 and four planes 40 in the first housing unit 100 and the second housing unit 200 can be further changed, so that the first housing unit 100 and the second housing unit 200 can be processed by sheet metal bending, and other polygonal cross-sections of the cell housing 1000 can be formed by welding the first housing unit 100 and the second housing unit 200.

[0100] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A battery cell housing, characterized in that, The battery cell housing is made of steel. The battery cell housing includes a first housing unit and a second housing unit. The first housing unit surrounds a first receiving cavity, and the second housing unit surrounds a second receiving cavity. The edges of the first housing unit and the second housing unit abut against each other and are welded together so that the first receiving cavity and the second receiving cavity are in communication.

2. The cell housing as described in claim 1, characterized in that, The first housing unit includes at least one first housing connected end to end, the first housing enclosing to form the first receiving cavity; the second housing unit includes at least one second housing connected end to end, the second housing enclosing to form the second receiving cavity. The edge of the first housing abuts against and is welded to the edge of the second housing, and the first housing and the second housing together form the side of the cell housing.

3. The cell housing as described in claim 2, characterized in that, The first housing is a planar structure, and multiple first housings are connected end to end to form the first receiving cavity; The second housing is a planar structure, and multiple second housings are connected end to end to form the second receiving cavity.

4. The cell housing as described in claim 3, characterized in that, There are four of each of the first and second housings, and the battery cell housing is a rectangular housing.

5. The cell housing as described in claim 3, characterized in that, The edges of each of the first housing units are flush with each other; And / or, the edges of each of the second housing units are flush with each other.

6. The cell housing as described in claim 2, characterized in that, The end of the first housing unit away from the second housing unit is closed to form the end face of the cell housing; And / or, the end of the second housing unit away from the first housing unit is closed to form the end face of the cell housing.

7. The cell housing as described in claim 1, characterized in that, Along the height direction of the battery cell housing, the size of the first housing unit is less than or equal to 400 mm; And / or, along the height direction of the cell housing, the size of the second housing unit is less than or equal to 400 mm.

8. The cell housing as described in claim 1, characterized in that, The first housing unit includes a first plane, a plurality of second planes and a third plane formed sequentially after being bent along the circumference. The first plane, the plurality of second planes and the third plane surround the first receiving cavity. The second housing unit is also formed a fourth plane, a plurality of fifth planes and a sixth plane formed sequentially after being bent along the circumference. The fourth plane, the plurality of fifth planes and the sixth plane surround the first receiving cavity. The edge of the first plane away from the second plane abuts against and is welded to the edge of the fourth plane away from the fifth plane, and the first plane and the fourth plane form one side of the cell housing; The edge of the third plane away from the second plane abuts against and is welded to the edge of the sixth plane away from the fifth plane, and the third plane and the sixth plane form another side of the cell housing.

9. The cell housing as described in claim 8, characterized in that, The first plane and the third plane of the first housing unit are flush. And / or, the fourth plane and the sixth plane of the second housing unit are flush; And / or, the number of the second plane and the fourth plane is one, and the cell housing is a rectangular housing.

10. The cell housing as described in any one of claims 1-9, characterized in that, The first housing unit and the second housing unit have the same external dimensions; And / or, the thickness of the first housing unit is less than or equal to 5 mm; And / or, the thickness of the second housing unit is less than or equal to 5 mm.

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