Battery cell housing and battery

Abstract

The utility model relates to battery technology field discloses a kind of battery shell and battery.The battery shell includes first flange and second flange of independent forming.Both are formed part profile by at least one end circumferential bending along first direction, and are enclosed to constitute hollow shell by two ends butt joint. The butt joint forms first weld and second weld extending along first direction, and the first opening and second opening are formed in both ends of shell. First end cover and second end cover cover two openings respectively, and its projection completely covers the opening projection. The first flange and second flange are central symmetrical about the central axis parallel to first direction. Battery includes the shell and built-in battery component, and its positive / negative pole component respectively from two end covers. By split type symmetrical flange design, the multiple continuous bending of a kind of scheme whole plate material is decomposed into independent single / double bending, and the risk of spatial interference of multiple bending is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell casing and a battery. Background Technology

[0002] With the continuous development of new energy technologies, batteries are increasingly widely used in various products. The design and processing technology of battery cell casings directly affect the safety, stability and service life of batteries.

[0003] As a crucial component of a battery, the difficulty of molding the cell casing directly impacts the battery's production cost. Therefore, effectively reducing the molding difficulty of the cell casing is a pressing issue in battery technology. Utility Model Content

[0004] This utility model provides a cell casing and a battery to reduce the difficulty of its processing and molding.

[0005] The present invention provides a battery cell housing, comprising:

[0006] The first folding plate is independently formed and at least one end is bent around a first direction;

[0007] The second folding plate is independently formed and at least one end is bent around the first direction. The two ends of the second folding plate are respectively connected to the two ends of the first folding plate to enclose and form a hollow battery cell shell. The connection end between the second folding plate and the first folding plate forms a first weld and a second weld. The first weld and the second weld extend along the first direction. The two ends of the battery cell shell in the first direction form a first opening and a second opening.

[0008] A first end cap is connected to and sealed to the first opening;

[0009] The second end cap is connected to and sealed to the second opening;

[0010] The first folding plate and the second folding plate are centrally symmetrical about a central axis, which is parallel to the first direction.

[0011] In one embodiment of the present invention, the first folding plate includes a first main body portion parallel to the second direction and a first bending portion and a second bending portion parallel to the third direction, wherein the first bending portion and the second bending portion are respectively connected to the two ends of the first main body portion in the second direction;

[0012] The second folding plate includes a second main body portion parallel to the second direction and a third bending portion and a fourth bending portion parallel to the third direction, wherein the third bending portion and the fourth bending portion are respectively connected to the two ends of the second main body portion in the second direction;

[0013] The first bent portion and the third bent portion are connected by the first weld, and the second bent portion and the fourth bent portion are connected by the second weld.

[0014] In one embodiment of the present invention, in the third direction, the first bent portion, the second bent portion, the third bent portion, and the fourth bent portion have equal dimensions.

[0015] In one embodiment of the present invention, in the third direction, the size of the first bent portion is smaller than that of the third bent portion, and the size of the second bent portion is larger than that of the fourth bent portion.

[0016] In one embodiment of this utility model, in the third direction, the dimension a of the first bending portion satisfies: 0.8mm≤a≤t-2R, where t is the dimension of the battery cell housing in the third direction, R is the bending radius of the bending position of the first bending portion, and the dimension range of the second bending portion, the third bending portion, and the fourth bending portion is the same as that of the first bending portion.

[0017] In one embodiment of the present invention, the dimension of the battery cell housing in the first direction is ≤350mm, the dimension of the battery cell housing in the second direction is ≤200mm, and the dimension of the battery cell housing in the third direction is ≤75mm.

[0018] In one embodiment of the present invention, the first folding plate includes a first main body portion parallel to the second direction and a fifth bending portion parallel to the third direction, wherein the fifth bending portion is connected to one end of the first main body portion in the second direction;

[0019] The second folding plate includes a second main body portion parallel to the second direction and a sixth bending portion parallel to the third direction, the sixth bending portion being connected to one end of the second main body portion in the second direction;

[0020] The fifth bend is connected to the end of the second main body away from the sixth bend via the first weld, and the sixth bend is connected to the end of the first main body away from the fifth bend via the second weld.

[0021] In one embodiment of the present invention, the dimension of the battery cell housing in the first direction is ≤150mm, the dimension of the battery cell housing in the second direction is ≤80mm, and the dimension of the battery cell housing in the third direction is ≤75mm.

[0022] In one embodiment of the present invention, the ratio of the dimension of the battery cell housing in the first direction to the dimension of the battery cell housing in the second direction is ≤4, and the ratio of the dimension of the battery cell housing in the second direction to the dimension of the battery cell housing in the third direction is ≤5.

[0023] In one embodiment of the present invention, the ratio of the dimension of the battery cell housing in the second direction to the dimension of the battery cell housing in the third direction is greater than 5, and the wall thickness of the battery cell housing is ≥0.4mm.

[0024] In one embodiment of the present invention, the dimension of the battery cell housing in the first direction is greater than 350 mm, and / or the dimension of the battery cell housing in the second direction is greater than 200 mm;

[0025] The battery cell housing is provided with reinforcing ribs and / or has an internal support frame.

[0026] In one embodiment of the present invention, a first welding layer is formed on the side of the first end cap away from the housing, the first welding layer connecting the first end cap and the first opening to form a seal, and a second welding layer is formed on the side of the second end cap away from the housing, the second welding layer connecting the second end cap and the second opening to form a seal.

[0027] This utility model also provides a battery, comprising:

[0028] The aforementioned battery cell housing;

[0029] The battery cell assembly is housed within the battery cell housing.

[0030] The beneficial effects of this utility model are as follows: The battery cell casing and battery proposed by this utility model decompose the four continuous bending of the whole plate in one solution into the independent forming of the first fold plate and the second fold plate. Each plate only needs to complete the circumferential bending at one end or both ends, which greatly reduces the number of bending times in a single processing and avoids the process feasibility problem caused by spatial interference during multiple bending processes. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0032] In the attached diagram:

[0033] Figure 1 A three-dimensional structural schematic diagram of the battery cell housing provided in Embodiment 1 of this utility model;

[0034] Figure 2 A schematic diagram of the structure of the first folding plate provided in Embodiment 1 of this utility model (the dotted lines in the figure indicate the bending positions);

[0035] Figure 3 This is a schematic diagram of the end face structure of the battery cell housing provided in Embodiment 1 of this utility model;

[0036] Figure 4 A three-dimensional structural schematic diagram of the battery cell housing provided in Embodiment 2 of this utility model;

[0037] Figure 5 This is a schematic diagram of the structure of the first folding plate provided in Embodiment 2 of this utility model (the dotted lines in the figure indicate the bending positions);

[0038] Figure 6 This is a schematic diagram of the end face structure of the battery cell housing provided in Embodiment 2 of this utility model;

[0039] Figure 7 A three-dimensional structural schematic diagram of the battery cell housing provided in Embodiment 3 of this utility model;

[0040] Figure 8 This is a schematic diagram of the structure of the first folding plate provided in Embodiment 3 of this utility model (the dotted lines in the figure indicate the bending positions);

[0041] Figure 9 This is a schematic diagram of the end face structure of the battery cell housing provided in Embodiment 3 of this utility model.

[0042] The attached figures are labeled as follows:

[0043] 10. First folded plate; 11. First main body; 12. First bend; 13. Second bend; 14. Fifth bend; 20. Second folded plate; 21. Second main body; 22. Third bend; 23. Fourth bend; 24. Sixth bend; 30. First opening; 40. Second opening; 50. First weld; 60. Second weld. Detailed Implementation

[0044] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0046] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0047] With the continuous advancement of new energy technologies, the importance of batteries in diverse application scenarios is becoming increasingly prominent. As a key structural component of the battery system, the design rationality and processing quality of the battery cell casing directly affect the battery's safety, structural stability, and overall lifespan. At the same time, the complexity of the casing molding process is highly correlated with manufacturing costs; therefore, reducing its molding difficulty has become a crucial technological bottleneck that urgently needs to be overcome to enhance the competitiveness of battery products.

[0048] Taking a typical dual-channel battery casing as an example, its material is usually aluminum or stainless steel. Taking stainless steel casing processing as an example, one process requires bending a single metal plate multiple times (typically four times) to form a rectangular cylindrical structure, and finally welding to seal the seams to form a hollow cavity. This multi-bending process has two main drawbacks: firstly, subsequent bending operations are prone to spatial interference with previously formed structural parts, reducing processing feasibility; secondly, accumulated process errors may affect the dimensional accuracy and shape consistency of the casing. These factors not only increase the difficulty of process debugging and the complexity of production cycle control, but also limit the potential for manufacturing cost optimization. Developing more efficient and reliable casing forming solutions is of great significance for promoting the development of battery technology.

[0049] The first direction of this utility model (X direction in the figure) refers to the bending axis direction of the first folding plate 10 and the second folding plate 20, the second direction (Y direction in the figure) is the width direction of the battery cell shell and is perpendicular to the first direction, and the third direction (Z direction in the figure) is the thickness direction of the battery cell shell and is perpendicular to the first and second directions.

[0050] Please see Figure 1-9 , Figure 1 , 4 7 is a battery cell housing provided by this utility model, including a first folding plate 10, a second folding plate 20, a first end cap, and a second end cap.

[0051] Both the first folding plate 10 and the second folding plate 20 are independently manufactured by bending around the first direction (single-end or double-end). The specific manufacturing process involves bending one or both ends of a single sheet of material to form the first folding plate 10 or the second folding plate 20. Each bending position can be formed by multiple small-angle bends in stages. Compared to a single large-angle bend, multiple small-angle bends in stages can more evenly distribute the stress in the material (e.g., stainless steel), reducing the deformation stress caused by a single large-angle bend.

[0052] like Figure 3 , 6 As shown in Figure 9, the two ends of the second folding plate 20 are respectively connected to the two ends of the first folding plate 10 (specifically, by laser segmented welding to reduce thermal deformation) to enclose and form a hollow battery cell shell (specifically, a square cylindrical structure). The connection ends of the second folding plate 20 and the first folding plate 10 form a first weld 50 and a second weld 60, which extend along a first direction. The two ends of the battery cell shell in the first direction form a first opening 30 and a second opening 40. The first opening 30 and the second opening 40 facilitate the installation of end caps to close the battery cell shell. The effective weld width of the first weld 50 and the second weld 60 is ≥600μm, and the effective weld depth is ≥250μm.

[0053] The first end cap connects to and seals the first opening 30, and the second end cap connects to and seals the second opening 40. The first and second end caps ensure that the casing can be effectively sealed and possesses excellent sealing performance, preventing leakage of liquid or gas inside the battery. The projection of the end caps covers the projection of the openings, ensuring the reliability of the sealing effect and preventing the external environment from affecting the battery during use.

[0054] Among them, such as Figure 3 , 6 As shown in Figure 9, the first folding plate 10 and the second folding plate 20 are centrally symmetrical about a central axis, which is parallel to the first direction. Since the first folding plate 10 and the second folding plate 20 are symmetrical and identical in shape, only one type of component needs to be manufactured. This not only reduces the types of parts in the production process but also lowers manufacturing costs and inventory management complexity. Using identical components ensures structural consistency for each cell casing, avoiding assembly errors or shape inconsistencies caused by differences in component shapes. Due to the symmetry of the folding plates, the assembly process is simpler. Whether welding, installing end caps, or conducting quality inspection, operators can perform tasks according to the same standards, further simplifying the assembly process and improving assembly accuracy.

[0055] The above solution avoids the complex operation of multiple bending steps in a single process by employing a symmetrical design and independent processing. In this process, a single metal plate is bent four times to form a rectangular cylindrical structure (the four bends correspond to the four edges of the rectangular cylinder), and finally welded to seal the seams and create a hollow cavity. After the first two bends form a U-shaped groove, the last two bends (the third and fourth) need to be performed in a semi-enclosed space. This semi-enclosed space restricts the movement of the bending tool, and the tool's operation in the narrow space may be hindered, increasing the difficulty of operation. Multiple bends may lead to cumulative errors, affecting the accuracy of the final structure. Multiple bends require precise control, increasing the difficulty of debugging and time costs.

[0056] The above solution splits a single metal sheet into two sheets for separate bending, with each sheet requiring only 1-2 bends (1 bend at one end, 2 bends at both ends). Each sheet operates as an open planar structure during bending, without any enclosing constraints, allowing unrestricted movement of the bending tool and avoiding the semi-enclosed space operation problem common in some processes. The two bent sheets are welded together to form a complete rectangular cylindrical hollow cavity, ensuring structural integrity and sealing. By reducing the number of bends, employing a symmetrical design, and using identical bending plate structures, the processing flow is simplified, and process complexity is reduced. Using identical or symmetrical bending designs for both sheets reduces the types of molds and the number of components, simplifying production management.

[0057] In one embodiment of this utility model, as Figure 1 , 4 As shown in Figure 7, the first folding plate 10 includes a first main body portion 11 parallel to the second direction and a first bent portion 12 and a second bent portion 13 parallel to the third direction. The first bent portion 12 and the second bent portion 13 are respectively connected to the two ends of the first main body portion 11 in the second direction. That is, both ends of the first folding plate 10 are bent, and the included angle between the first main body portion 11 and the first bent portion 12 and the second bent portion 13 is 89°-91°.

[0058] like Figure 1 , 4 As shown in Figure 7, the second folding plate 20 includes a second main body portion 21 parallel to the second direction and a third bent portion 22 and a fourth bent portion 23 parallel to the third direction. The third bent portion 22 and the fourth bent portion 23 are respectively connected to the two ends of the second main body portion 21 in the second direction. That is, both ends of the second folding plate 20 are bent, and the included angle between the second main body portion 21 and the third bent portion 22 and the fourth bent portion 23 is 89°-91°.

[0059] The first bend 12 and the third bend 22 are connected by the first weld 50, and the second bend 13 and the fourth bend 23 are connected by the second weld 60.

[0060] In the above design, the first weld 50 and the second weld 60 are located on two opposite surfaces, and the first weld 50 and the second weld 60 are located on the two smaller surfaces of the battery cell casing. Since the battery cell may expand during use, the smaller surfaces are less likely to be directly affected by the expansion pressure. Therefore, this design ensures that the weld locations will not deform or fail due to excessive pressure during the expansion of the battery cell casing.

[0061] Example 1, as Figure 1-3 As shown, in the third direction, the dimensions of the first bend 12, the second bend 13, the third bend 22, and the fourth bend 23 are equal. That is, the first weld 50 and the second weld 60 are both centrally located. During the welding process, due to the uneven thermal expansion and contraction, deformation of the welded part often occurs. By centrally arranging the welds, the influence of welding deformation can be effectively reduced, and the thermal stress generated on both sides during the welding process is basically the same, which can reduce the asymmetric distortion of the overall structure.

[0062] Example 2, as Figure 4-6 As shown, in the third direction, the size of the first bend 12 is smaller than that of the third bend 22, and the size of the second bend 13 is larger than that of the fourth bend 23. That is, the first weld 50 and the second weld 60 are offset from the centerline, and are closer to the bend positions on one side. During bending, the strength at the bend position is higher than in other areas; although the plasticity decreases, the strength increases. This means that during welding, the bend position can withstand the heat effects of welding more effectively than other areas, thus reducing the risk of deformation due to thermal expansion or cooling contraction. Placing the first weld 50 and the second weld 60 near these high-strength bend positions avoids the influence of the heat-affected zone on the casing deformation, significantly improving the casing forming yield, i.e., reducing the scrap rate during production. Simultaneously, because the first weld 50 and the second weld 60 are close to the bend positions, the stress on the battery casing during expansion is less than when they are located in the central region. This is because the higher strength at the bend positions provides better mitigation of stress diffusion caused by cell expansion. This effectively prevents the casing from being excessively deformed, which could affect the overall performance and safety of the battery and improve the stability and reliability of the battery cell.

[0063] In one embodiment of this utility model, taking the wall thickness of the battery cell casing as 0.2mm as an example, in the third direction, the dimension 'a' of the first bending portion 12 satisfies 0.8mm≤a≤t-2R, where R is the bending radius, 0.5mm≤R≤5mm, and preferably 0.8mm≤a≤60mm. The lower limit of the dimension 'a' of the first bending portion 12 is set because an excessively small bending portion dimension may lead to excessive bending stress, thereby increasing the risk of material deformation or breakage. Such a dimension setting can effectively ensure that there is sufficient metal material for bending during bending. At the same time, if the bending portion dimension is too small, the bending position may be too compact, making it difficult to achieve a smooth bending operation, thus affecting the shape accuracy after bending.

[0064] The upper limit of dimension a of the first bending portion 12 is set to avoid the first bending portion 12 occupying one full surface of the cell housing. The dimension range of the second bending portion 13, the third bending portion 22 and the fourth bending portion 23 is the same as that of the first bending portion 12.

[0065] In one embodiment of this utility model, the wall thickness of the cell casing is taken as 0.2mm, and the dimension h of the cell casing in the first direction is ≤350mm. The main function of this dimension limitation is to avoid thermal deformation due to thermal expansion during the welding process. The cell casing will be heated during the welding process. If the casing is too hot, thermal deformation may lead to structural distortion and failure, thereby affecting the safety and life of the battery.

[0066] Taking a cell casing wall thickness of 0.2mm as an example, the cell casing dimension w in the second direction should be ≤200mm. The purpose of the width restriction is to reduce the risk of lateral instability of the cell casing. An excessively wide cell casing may bend or deform laterally when subjected to external pressure or vibration, thereby reducing the mechanical strength and stability of the battery.

[0067] Taking a cell casing wall thickness of 0.2mm as an example, the dimension t in the third direction of the cell casing should be ≤75mm. Limiting the thickness dimension helps prevent indentation in the center of the cell casing's small facet. If the casing thickness is too thin or the size is too large, indentation may occur when the small facet is subjected to pressure during manufacturing or use, thus affecting the battery's packaging quality and the cell's safety.

[0068] Example 3, as Figure 7-9As shown, the first folding plate 10 includes a first main body portion 11 parallel to the second direction and a fifth bent portion 14 parallel to the third direction, the fifth bent portion 14 being connected to one end of the first main body portion 11 in the second direction. The second folding plate 20 includes a second main body portion 21 parallel to the second direction and a sixth bent portion 24 parallel to the third direction, the sixth bent portion 24 being connected to one end of the second main body portion 21 in the second direction. The end of the fifth bent portion 14 away from the sixth bent portion 24 of the second main body portion 21 is connected by a first weld 50, and the end of the sixth bent portion 24 away from the fifth bent portion 14 of the first main body portion 11 is connected by a second weld 60.

[0069] This design requires only one bending of each of the first and second folding plates 10 and 20, followed by two welding operations, simplifying the production process. Compared to other designs that may require multiple bending and welding steps, this design reduces the time spent adjusting and repositioning the workpiece, thus improving overall production efficiency. Reducing the number of bending operations avoids microcracks or plastic deformation caused by large localized stress concentrations, and reduces stress accumulation during multiple bending processes, thereby lowering the risk of material breakage and improving the overall reliability of the battery cell casing.

[0070] In one embodiment of this utility model, based on Embodiment 3, the wall thickness of the battery cell casing is taken as 0.2mm, and the dimension h of the battery cell casing in the first direction is ≤150mm, preferably 30mm-120mm. This size limitation can effectively prevent the battery cell casing from being too large, which could lead to the risk of thermal and mechanical deformation during production. Especially during the welding process, an excessively tall casing may accumulate heat and cause uneven deformation.

[0071] Taking a cell casing wall thickness of 0.2mm as an example, the cell casing dimension w in the second direction is ≤80mm, preferably 15mm-60mm. This dimensional limitation helps reduce the risk of lateral instability of the casing during use. If the battery casing is too wide, it may bend laterally under external forces, affecting its mechanical strength and service life.

[0072] Taking a cell casing wall thickness of 0.2mm as an example, the dimension t of the cell casing in the third direction should be ≤75mm, preferably 5mm-50mm. This limitation helps prevent indentation in the center of the casing facet. Excessive casing thickness may cause external pressure concentration during manufacturing or in actual use, leading to indentation or uneven deformation on the casing surface.

[0073] Small-sized batteries are commonly used in consumer electronics products such as smartphones, headphones, and watches, where the strength requirements for batteries are relatively low. Their casing design can focus on portability and cost-effectiveness without needing to withstand high-intensity external impacts or extreme environmental changes. Small-sized batteries are suitable for the solution in Example 3, which reduces structural strength while also lowering costs.

[0074] In one embodiment of this utility model, the ratio of the dimension h of the battery cell housing in the first direction to the dimension w of the battery cell housing in the second direction is ≤4. This ensures that the ratio of the height h to the width w of the battery cell housing is appropriate, preventing the sidewall of the housing from buckling or deforming due to excessive height under external forces (such as vibration or external pressure). If h is too large and w is too small, the housing is prone to local bending or buckling, resulting in a decrease in structural strength.

[0075] The ratio of the cell casing's dimension *w* in the second direction to its dimension *t* in the third direction should be ≤ 5. Ensure the ratio of the cell casing's width *w* to its thickness *t* is reasonable. If *w* is relatively large and *t* is thin, the center of the battery casing is prone to denting under external forces, especially under pressure during manufacturing, transportation, or use. A reasonable ratio can prevent denting caused by an excessively thin casing.

[0076] In one embodiment of this utility model, the ratio of the dimension w of the cell housing in the second direction to the dimension t of the cell housing in the third direction is greater than 5, and the wall thickness of the cell housing is ≥0.4mm. When the dimension w of the cell housing in the second direction (width direction) is large, and the wall thickness of the cell housing is appropriately increased, structural instability caused by excessive width can be effectively avoided. Increasing the wall thickness helps to distribute external pressure, preventing central depression or instability due to a weak housing. Increasing the wall thickness can effectively prevent deformation or cracking caused by external forces (such as collisions or pressure). By increasing the wall thickness, the housing can better resist external impacts, ensuring the safety of the battery during use.

[0077] In one embodiment of this utility model, the wall thickness of the battery cell housing is taken as 0.2mm. The dimension h of the battery cell housing in the first direction is greater than 350mm, and / or the dimension w of the battery cell housing in the second direction is greater than 75mm. The battery cell housing is provided with reinforcing ribs and / or has an internal support frame. The reinforcing ribs, by adding support structures inside or outside the battery cell housing, can effectively increase the rigidity of the housing and improve its compressive and bending resistance. Especially for larger battery cell housings, where a single wall thickness cannot meet the strength requirements, reasonably arranged reinforcing ribs can disperse external pressure or load, preventing the housing from deforming or cracking.

[0078] The support frame further enhances the structural stability of the cell casing. In larger cell casings, the support frame, by forming a grid-like or frame structure, effectively distributes external forces and prevents the cell casing from twisting or partially collapsing under external impacts, vibrations, or pressure changes.

[0079] A first weld layer is formed on the side of the first end cap away from the housing, the first weld layer connecting the first end cap and the first opening 30 to form a seal, and a second weld layer is formed on the side of the second end cap away from the housing, the second weld layer connecting the second end cap and the second opening 40 to form a seal.

[0080] Placing the first and second weld layers on the side away from the shell prevents them from overlapping with the first weld 50 and the second weld 60 on the shell. This avoids intensified thermal deformation and localized material property degradation, protecting the main shell structure (the area of ​​the first weld 50 and the second weld 60 and its vicinity) from concentrated thermal damage.

[0081] This utility model also provides a battery, including the aforementioned cell housing and cell assembly.

[0082] The battery cell assembly is housed within the battery cell casing.

[0083] In summary, this utility model, by employing a symmetrical design and independent processing method, avoids the need for multiple bending and complex operations in the process of a single solution, thus reducing the complexity of the process steps. This not only improves production efficiency but also reduces debugging and time costs during production, lowering manufacturing difficulty and defect rate. The use of bending and welding connections optimizes the shape and strength of the battery cell casing. In particular, the design incorporates reasonable bending dimensions, weld placement, and symmetry, effectively preventing deformation caused by uneven thermal expansion during welding, thereby improving the overall stability and strength of the battery cell casing. The design reduces the number of parts by using identical components (such as the symmetrical structure of the first folding plate 10 and the second folding plate 20), reducing the difficulty of parts management during production, as well as manufacturing costs and inventory management complexity. Furthermore, the simplified production process reduces assembly errors caused by inconsistent parts shapes, further improving product quality. By reasonably limiting the dimensions of the battery cell casing in different directions (e.g., limiting the ratio of size to wall thickness), problems such as thermal deformation and lateral instability that may occur during manufacturing and use are effectively avoided. Proper dimensional design ensures the stability of the cell casing shape during processing, reducing the impact of external environments (such as high temperature or pressure) on battery performance.

[0084] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery cell housing, characterized in that, include: The first folding plate is independently formed and at least one end is bent around a first direction; The second folding plate is independently formed and at least one end is bent around the first direction. The two ends of the second folding plate are respectively connected to the two ends of the first folding plate to enclose and form a hollow battery cell shell. The connection end between the second folding plate and the first folding plate forms a first weld and a second weld. The first weld and the second weld extend along the first direction. The two ends of the battery cell shell in the first direction respectively form a first opening and a second opening. A first end cap is connected to and sealed to the first opening; The second end cap is connected to and sealed to the second opening; The first folding plate and the second folding plate are centrally symmetrical about a central axis, which is parallel to the first direction.

2. The cell housing according to claim 1, characterized in that, The first folding plate includes a first main body portion parallel to the second direction and a first bending portion and a second bending portion parallel to the third direction, wherein the first bending portion and the second bending portion are respectively connected to the two ends of the first main body portion in the second direction; The second folding plate includes a second main body portion parallel to the second direction and a third bending portion and a fourth bending portion parallel to the third direction, wherein the third bending portion and the fourth bending portion are respectively connected to the two ends of the second main body portion in the second direction; The first bent portion and the third bent portion are connected by the first weld, and the second bent portion and the fourth bent portion are connected by the second weld.

3. The cell housing according to claim 2, characterized in that, In the third direction, the dimensions of the first bend, the second bend, the third bend, and the fourth bend are equal, or... In the third direction, the size of the first bend is smaller than that of the third bend, and the size of the second bend is larger than that of the fourth bend.

4. The cell housing according to claim 2, characterized in that, In the third direction, the dimension a of the first bending portion satisfies: 0.8mm≤a≤t-2R, where t is the dimension of the cell housing in the third direction, R is the bending radius of the bending position of the first bending portion, and the dimension range of the second bending portion, the third bending portion, and the fourth bending portion is the same as that of the first bending portion.

5. The cell housing according to any one of claims 1-4, characterized in that, The cell housing has a dimension ≤350mm in the first direction, a dimension ≤200mm in the second direction, and a dimension ≤75mm in the third direction.

6. The cell housing according to claim 1, characterized in that, The first folding plate includes a first main body portion parallel to the second direction and a fifth bending portion parallel to the third direction, wherein the fifth bending portion is connected to one end of the first main body portion in the second direction; The second folding plate includes a second main body portion parallel to the second direction and a sixth bending portion parallel to the third direction, the sixth bending portion being connected to one end of the second main body portion in the second direction; The fifth bend is connected to the end of the second main body away from the sixth bend via the first weld, and the sixth bend is connected to the end of the first main body away from the fifth bend via the second weld.

7. The cell housing according to claim 6, characterized in that, The cell housing has a dimension ≤150mm in the first direction, a dimension ≤80mm in the second direction, and a dimension ≤75mm in the third direction.

8. The cell housing according to claim 1, characterized in that, The ratio of the dimension of the battery cell housing in the first direction to the dimension of the battery cell housing in the second direction is ≤4, and the ratio of the dimension of the battery cell housing in the second direction to the dimension of the battery cell housing in the third direction is ≤5, or... The ratio of the dimension of the cell housing in the second direction to the dimension of the cell housing in the third direction is greater than 5, and the wall thickness of the cell housing is ≥0.4mm.

9. The cell housing according to claim 1, characterized in that, The cell housing has a dimension greater than 350 mm in the first direction, and the cell housing is provided with reinforcing ribs and / or has an internal support frame, and / or... The cell housing has a dimension greater than 200mm in the second direction, and the cell housing is provided with reinforcing ribs and / or has an internal support frame, and / or... A first weld layer is formed on the side of the first end cap away from the housing, the first weld layer connecting the first end cap and the first opening to form a seal, and a second weld layer is formed on the side of the second end cap away from the housing, the second weld layer connecting the second end cap and the second opening to form a seal.

10. A battery, characterized in that, include: The cell housing as described in any one of claims 1-9; The battery cell assembly is housed within the battery cell housing.

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