Shell, battery cell and battery

Abstract

The invention provides a shell, a battery monomer and a battery, an opening is formed in the end part of the shell along the height direction of the shell, the shell comprises a first side plate and a second side plate, the first side plate and the second side plate are adjacently arranged along the circumferential direction of the opening, and a corner is formed between the first side plate and the second side plate; the area of the outer wall of the first side plate is smaller than that of the outer wall of the second side plate; the first side plate comprises a first plate section and a second plate section which are arranged in the height direction of the shell, the thickness of the first plate section is larger than that of the second plate section, and the thickness difference is a; the second side plate comprises a two-plate first section and a two-plate second section which are arranged in the height direction of the shell, the thickness of the two-plate first section is larger than that of the two-plate second section, and the thickness difference is b; wherein in the height direction of the shell, the position of the one-plate two-section corresponds to the position of the two-plate two-section, and a is smaller than b. The shell, the battery monomer and the battery provided by the invention have better sealing performance and safety.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a casing, a battery cell, and a battery. Background Technology

[0002] In the development of battery technology, besides improving cell performance, safety is also a crucial issue that cannot be ignored. If battery safety cannot be guaranteed, then the battery is unusable. Therefore, how to enhance battery safety is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a casing, a battery cell, and a battery to at least partially solve the problem of low battery safety.

[0004] To achieve the above objectives, a first aspect of this application provides a housing, wherein an opening is formed at one end along the height direction of the housing, the housing comprising: a first side plate and a second side plate, which are circumferentially adjacent to each other along the opening and form an angle between them; the outer wall area of ​​the first side plate is smaller than the outer wall area of ​​the second side plate; the first side plate comprises a first plate segment and a second plate segment disposed along the height direction of the housing, the thickness of the first plate segment being greater than the thickness of the second plate segment, and the thickness difference being [missing information]. a; The second side plate includes a first section and a second section of the second plate disposed along the height direction of the shell, wherein the thickness of the first section of the second plate is greater than the thickness of the second section of the second plate and the thickness difference is [missing information]. b; wherein, along the height direction of the shell, the positions of the first plate segment and the second plate segment correspond, and a< b.

[0005] Based on the same inventive concept, the second aspect of this application also provides a battery cell, including the housing described in the first aspect; a cover assembly that covers the opening of the housing and forms a receiving space with the housing; and an electrode assembly disposed within the receiving space; wherein, along the height direction of the housing, the cover assembly is located on the side of the plate section closer to the opening.

[0006] Based on the same inventive concept, the third aspect of this application also provides a battery cell, including the battery cell described in the second aspect.

[0007] As can be seen from the above, in the casing, battery cell, and battery provided in this application, the outer wall area of ​​the first side plate is smaller than that of the second side plate. That is, compared with the second side plate, the straight-line distance from the center area to the area near the corner of the first side plate is smaller. The material flow rate of the area near the corner of the first side plate is greatly affected by the thinning degree. In order to make the material flow rate of the area near the corner of the first side plate more consistent with that of the area near the corner of the second side plate, the thinning degree of the first side plate is designed to be less than that of the second side plate. This makes the thickness of different areas along the width direction of the corner more similar, effectively reducing the risk of stress at the junction of the thicker and thinner areas of the corner, which helps to improve the structural strength of the corner, reduce the risk of cracks and splits, and help to improve the sealing and safety of the battery cell. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a partial cross-sectional schematic diagram of a battery cell with the first structure according to an embodiment of this application; Figure 2 This is a top view of the shell of the second structure according to an embodiment of this application; Figure 3 for Figure 2 Partial cross-sectional diagram of section AA; Figure 4 for Figure 3 An enlarged schematic diagram of section C; Figure 5 for Figure 2 Partial cross-sectional view of section BB in the middle; Figure 6 This is a schematic diagram comparing the partial structures of the first side plate and the second side plate in the shell of the second structure according to an embodiment of this application; Figure 7 For the shell of the third structure in Figure 2 Partial cross-sectional diagram of section AA; Figure 8 For the shell of the third structure in Figure 2 Partial cross-sectional view of section BB in the middle; Figure 9 This is a partial structural comparison diagram of the first side plate and the second side plate in the shell of the third structure of this application embodiment; Figure 10 Examples of embodiments of this application a = b. Schematic diagram of material flow during the stamping process of the shell; Figure 11 Examples of embodiments of this application a< A schematic diagram of material flow during the stamping process of shell b; Figure 12 for Figure 3 Partial cross-sectional diagram of section DD; Figure 13 These are thickness measurement data for each region of the second side plate in this embodiment of the application; Figure 14 These are thickness measurement data for each region of the first side panel in this embodiment of the application; Figure 15 This is a partial cross-sectional schematic diagram of a battery cell with the second structure according to an embodiment of this application; Figure 16 This is a partial cross-sectional schematic diagram of the molding die according to an embodiment of this application; Figure 17 This is a side view of the punch in the molding die according to an embodiment of this application; Figure 18 This is a schematic diagram of the punch and the formed shell according to an embodiment of this application; Figure 19 This is a side view of the punch and the formed housing according to an embodiment of this application; Figure 20 This is a schematic diagram of a punch with another structure according to an embodiment of this application.

[0010] Explanation of reference numerals in the attached figures: 1000, Shell; 100, First side plate; 110, One plate with four sections; 120, One plate with one section; 130, One plate with three sections; 140, One plate with five sections; 150, One plate with two sections; 200. Second side panel; 210. Second panel, first section; 220. Second panel, third section; 230. Second panel, second section; 231. Second section, first part; 232. Second section, second part; 300°, opening; 400°, corner; 2000, Cover plate assembly; 2100, Cover plate; 2200, Pole post; 3000, Electrode assembly; 4000, Accommodation space; 5100, Die cavity; 5110, Receiving cavity; 5200, Punch; 5210, First end; 5220, First outer surface; 5221, One surface, one area; 5222, One surface, two areas; 5223, One surface, three areas; 5230, Second outer surface; 5231, Two surfaces, one area; 5232, Two surfaces, two areas; 5233, Two surfaces, three areas; 5240, Elastic element. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0012] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0013] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0014] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0015] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] Figure 1 A partial cross-sectional schematic diagram of the battery cell of the first structure is shown.

[0017] The battery cell includes a housing 1000 and a cover assembly 2000, the housing 1000 being arranged along its height direction (e.g., Figure 1An opening 300 (which can also be called an open end) is formed at the top of the Z direction. The cover plate assembly 2000 is connected to the opening 300 and surrounds the housing 1000 to form a receiving space 4000. The electrode assembly 3000 is disposed in the receiving space 4000.

[0018] To meet the high capacity requirements of individual battery cells, it is necessary to increase the energy density of the individual battery cells. One way to do this is to thin a portion of the sidewall of the casing 1000 so that the thickness of that portion is less than the thickness of other areas of the casing 1000, that is, to form a casing 1000 with variable wall thickness.

[0019] by Figure 1 Taking the structure and orientation of the housing 1000 as an example, the portion of the sidewall of the housing 1000 near the opening 300 is thicker, and correspondingly, this portion has greater structural strength, allowing for a reliable connection with the cover assembly 2000; while the other portions are thinner, and their positions correspond to the placement positions of the electrode assembly 3000. This allows for an increase in the size of the accommodating space 4000 without changing the outer dimensions of the housing, thus accommodating a larger electrode assembly 3000.

[0020] A shell with varying wall thickness 1000 can be formed by stamping a plate-shaped workpiece. (Still using...) Figure 1 Taking the shell 1000 with the structure shown as an example, under the extrusion action of the mold on the workpiece to be processed, the material of the workpiece to be processed flows from the bottom of the shell 1000 to the opening 300 (understandably, when the shell 1000 is formed by stamping, the bottom of the shell 1000 is formed first), so that the part of the side wall of the shell 1000 near the bottom of the shell 1000 forms a thin-walled section with a smaller thickness, and the part near the opening 300 forms a thick-walled section with a larger thickness.

[0021] However, the applicant's research found that during the stamping process of forming the variable-wall thickness shell 1000, if the material cannot flow stably, physical defects may occur at the interface between the thick-walled and thin-walled sections, leading to insufficient fatigue strength at that location. During the charge-discharge cycle of the battery cell, the electrode assembly 3000 repeatedly expands and contracts, easily applying mechanical stress to the aforementioned interface. When physical defects exist at the interface, cracks or even ruptures are likely to occur due to insufficient fatigue strength, adversely affecting the sealing and safety of the battery cell.

[0022] To address the aforementioned issues, embodiments of this application provide housings 1000 with alternative structures.

[0023] Figure 2 A top view of the second type of shell 1000 is shown. Figure 3 Showing Figure 2A partial cross-sectional diagram of section AA.

[0024] like Figure 2 and Figure 3 In some embodiments, the housing 1000 is positioned along its height direction (e.g., ...). Figure 3 An opening 300 is formed at the end of the housing 1000 (in the Z direction). The housing 1000 includes a first side plate 100, which is disposed on at least one side of the opening 300 along the circumference of the opening 300. The first side plate 100 includes a plate with four segments 110, a plate with one segment 120, and a plate with three segments 130 arranged sequentially along the height direction of the housing 1000. The plate with four segments 110 is close to the opening 300. The thickness of the plate with one segment 120 is greater than the thickness of the other parts of the first side plate 100 except for the plate with one segment 120. The thickness of the four-section plate 110 gradually increases from the side closer to the opening 300 towards the one-section plate 120, and the thickness of the three-section plate 130 gradually decreases from the one-section plate 120 towards the side farther from the opening 300. Among them, relative to the inner wall of the one-section plate 120, the inner wall of the four-section plate 110 is inclined towards the opening 300, and the inner wall of the three-section plate 130 is inclined towards the direction away from the opening 300. The slope of the inner wall of the four-section plate 110 is greater than the slope of the inner wall of the three-section plate 130.

[0025] For example, the material of the housing 1000 can be copper, iron, aluminum, stainless steel or aluminum alloy, etc., and is not limited here.

[0026] It should be noted that when the housing 1000 is used for a single battery cell, the opening 300 is connected to the receiving space 4000, and the electrode assembly 3000 can be installed in the receiving space 4000 through the opening 300.

[0027] In this embodiment, "one plate with four segments 110 is closer to the opening 300" means that "one plate with four segments 110 is closer to the opening 300" compared to "one plate with one segment 120" and "one plate with three segments 130", and does not mean that "one plate with four segments 110 generally extends to the opening 300".

[0028] like Figure 2 The shell 1000 can be a square shell, and the opening 300 can be formed by four side plates. The four side plates include two side plates with smaller outer wall areas (hereinafter referred to as small side plates) spaced apart along the X direction, and two side plates with larger outer wall areas (hereinafter referred to as large side plates) spaced apart along the Y direction. The first side plate 100 can be constructed as at least one of the four side plates.

[0029] by Figure 3Taking the structure shown as an example, the outer walls of the four-section plate 110, the one-section plate 120, and the three-section plate 130 can be located in the same vertical plane. That is, the thickness difference or thickness variation of the three sections 110, 120, and 130 are all reflected in their inner walls.

[0030] It should also be noted that, with Figure 3 Taking the direction in the middle as an example, the thickness of a three-section 130 plate gradually decreases from top to bottom, so the thickness of the part below the three-section 130 plate is less than the thickness of the three-section 130 plate. Similarly, the thickness of a four-section 110 plate gradually decreases from bottom to top, so the thickness of the part above the four-section 110 plate is less than the thickness of the four-section 110 plate.

[0031] Figure 4 Showing Figure 3 An enlarged schematic diagram of section C.

[0032] like Figure 4 The material flow of the first side plate 100 is as follows Figure 4 As shown by the dashed arrow, during the stamping process of forming the first side plate 100, the material flows from the side of the three-section plate 130 away from the opening 300 to the four-section plate 110. In this embodiment, the slope of the inner wall of the three-section plate 130 is designed to be relatively small, which allows the material to flow more smoothly and stably towards the three-section plate 130 and the first section plate 120. This helps reduce the risk of physical defects forming at the lower edge of the three-section plate 130 (i.e., the edge away from the opening 300, which is the junction of the three-section plate 130 and the thin-walled section in the first side plate 100). At the same time, the slope of the inner wall of the four-section plate 110 is designed to be relatively large, which allows material to accumulate at the positions of the first section plate 120 and the four-section plate 110 during the material flow. This causes the grain spacing of the metal material in this area to be refined due to extrusion, thereby strengthening this area.

[0033] The applicant's research revealed that the relationship between the slope of the inner wall of a 110-section plate (four segments) and the slope of the inner wall of a 130-section plate (three segments) is key to controlling the refinement level of 120-section plates (one segment) and 110-section plates (four segments). When the slope of the inner wall of a 110-section plate (four segments) is greater than the slope of the inner wall of a 130-section plate (three segments), the refinement level of 120-section plates and 110-section plates (one segment) can meet the strength requirements.

[0034] The housing 1000 provided in this embodiment has a first side plate 100 with a fourth section 110 connected to the first section 120 on the side of the thicker section 120 near the opening 300, and a third section 130 connected to the first section 120 on the side away from the opening 300. The inner wall of the third section 130 is designed as a slope with a small gradient, which allows the material of the first side plate 100 to flow more smoothly and stably during the stamping process of the housing 1000. This avoids physical defects at the junction of the third section 130 and the adjacent thinner part, giving the junction strong fatigue strength. When subjected to repeated compression (caused by the repeated expansion and contraction of the electrode assembly 3000) or vibration, the risk of cracks at the junction is low. For battery cells using the housing 1000 of this embodiment, this helps to improve their sealing and safety.

[0035] Meanwhile, compared to the three-section plate 130, designing the inner wall of the four-section plate 110 as a sloped surface with a larger gradient allows for material accumulation on the one-section plate 120 and the four-section plate 110 during material flow, thereby achieving structural reinforcement. This gives the one-section plate 120 and the four-section plate 110 higher structural strength, ensuring that the opening 300 of the casing 1000 can resist irreversible deformation of the casing 1000 caused by thermal stress during welding, and enabling a reliable connection with the cover plate assembly 2000. This also helps to improve the sealing and safety of the battery cell.

[0036] like Figure 3 In some embodiments, the angle α formed by the extension line of a section 120 along the height direction of the housing 1000 toward the opening 300 and the inner wall of the section 110 is 10° to 45°.

[0037] For example, the angle of 'a' can be 10°, 15°, 20°, 25°, 30°, 35°, 40°, or 45°.

[0038] It should be noted that, with Figure 3 Taking the structure and orientation shown as an example, the included angle α can be the upward extension of a 120° segment of a plate and the inner wall of a 110° segment of a plate. Figure 3 The included angle in the cross section shown, or the included angle in other cross sections of the first side plate 100 parallel to this cross section.

[0039] If the included angle α is too large, during the stamping process to form the shell 1000, it will become extremely difficult for the material of the first side plate 100 to continue flowing upward through the four-section plate 110. This will cause a large amount of material to accumulate in the four-section plate 110 and the portion below it, thereby increasing the risk of physical defects at the junction between adjacent sections of the first side plate 100. If the included angle α is too small, it will be difficult to achieve structural reinforcement in the one-section plate 120 and the four-section plate 110.

[0040] To avoid the aforementioned problems, this embodiment designs the included angle α to be between 10° and 45°. This not only effectively strengthens the structure of the plate-120 and plate-410, helping to prevent irreversible deformation of the casing 1000, but also allows the material to flow more smoothly and stably after passing through the plate-410 during the stamping process of the casing 1000. This reduces the risk of physical defects in the plate-410 and the parts below it, helping to ensure that the casing 1000 as a whole has high fatigue strength and improving the sealing and safety of the battery cells.

[0041] like Figure 3 In some embodiments, the angle b formed by the extension line of the plate segment 120 along the height direction of the housing 1000 away from the opening 300 and the inner wall of the plate segment 130 is 1° to 25°.

[0042] For example, the angle of b can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 12°, 14°, 16°, 18°, 20°, 22° or 25°.

[0043] It should be noted that, with Figure 3 Taking the structure and orientation shown as an example, the included angle b can be the downward extension of a 120° segment of a plate and the inner wall of a 130° segment of a plate. Figure 3 The included angle in the cross section shown, or the included angle in other cross sections of the first side plate 100 parallel to this cross section.

[0044] If the included angle b is too large, the material flow of the first side plate 100 will be obstructed during the stamping process of the shell 1000, resulting in physical defects at the junction of the three-section plate 130 and the adjacent thinner section. If the included angle b is too small, the thickness of the three-section plate 120 may be too small, making it impossible to achieve structural reinforcement of the portion of the shell 1000 near the opening 300 by setting the three-section plate 120, and the shell 1000 may be at risk of irreversible deformation; it may also cause the three-section plate 130 to occupy too much space on the first side plate 100 along the height direction of the shell 1000, and the effect of expanding the internal space of the shell 1000 will not be obvious.

[0045] To avoid the above problems, this embodiment designs the included angle b to be between 1° and 25°. This allows the material of the first side plate 100 to flow more smoothly and stably during the stamping process to form the housing 1000. It also prevents physical defects from occurring at the junction of the three sections 130 of the plate and the adjacent thinner sections, resulting in stronger fatigue strength at the junction. Furthermore, it ensures that the thickness of the three sections 120 of the plate meets the requirements for reinforcing the housing 1000, which helps improve the sealing and safety of the battery cells. It also effectively expands the internal space of the housing 1000, which helps to increase the energy density of the battery cells.

[0046] like Figure 3 In some embodiments, the first side plate 100 further includes a plate with five segments 140, which extends from the opening 300 to a plate with four segments 110, and the thickness of the plate with five segments 140 is less than the thickness of the plate with four segments 110.

[0047] For example, a plate with five sections of uniform thickness (140mm) is used.

[0048] by Figure 3 Taking the structure and orientation shown as an example, a thinner five-segment plate 140 is set above a four-segment plate 110. On the one hand, the five-segment plate 140 can be used to cooperate with the cover plate assembly 2000 and limit the cover plate assembly 2000 along the height direction of the shell 1000. On the other hand, when the structure of the side plate adjacent to the first side plate 100 along the circumference of the opening 300 is different from the structure of the first side plate 100, the five-segment plate 140 can also be used to reserve space for the thick-walled section of the adjacent side plate, so that the thicker one-segment plate 120 on the first side plate 100 and the thick-walled section of the adjacent side plate are staggered along the height direction of the shell 1000, which facilitates the demolding of the shell 1000.

[0049] like Figure 3 In some embodiments, the ratio of the size of the five-segment plate 140 to the size of the four-segment plate 110 (hereinafter referred to as the height ratio of the five-segment plate 140 to the four-segment plate 110) along the height direction of the housing 1000 is 1 to 30.

[0050] For example, the height ratio of a five-segment board 140 to a four-segment board 110 can be 1, 3, 6, 10, 15, 20, 25 or 30.

[0051] If the height ratio between the five-segment plate 140 and the four-segment plate 110 is too small, the dimension of the four-segment plate 110 along the height direction of the shell 1000 may be too large, resulting in an excessively small included angle α. This would make it difficult to achieve structural reinforcement for the one-segment plate 120 and the four-segment plate 110. Conversely, if the height ratio between the five-segment plate 140 and the four-segment plate 110 is too large, the dimension of the four-segment plate 110 along the height direction of the shell 1000 may be too small, resulting in an excessively large included angle α. This could lead to a risk of physical defects at the junction between adjacent segments of the first side plate 100.

[0052] To avoid the aforementioned problems, this embodiment designs the height ratio of the five-segment plate 140 to the four-segment plate 110 to be 1 to 30. This not only effectively strengthens the structure of the one-segment plate 120 and the four-segment plate 110, helping to prevent irreversible deformation of the casing 1000, but also allows the material to flow more smoothly and stably after passing through the four-segment plate 110 during the stamping process of the casing 1000. This reduces the risk of physical defects in the four-segment plate 110 and the parts below it, helping to ensure that the casing 1000 as a whole has high fatigue strength and improving the sealing and safety of the battery cells.

[0053] like Figure 3 In some embodiments, the first side plate 100 further includes a plate segment 150, which extends from a plate segment 130 in a direction away from the opening 300. The thickness of the plate segment 150 is less than the thickness of the plate segment 130. Along the height direction of the housing 1000, the ratio of the size of the plate segment 150 to the size of the plate segment 130 (hereinafter referred to as the height ratio of the plate segment 150 to the plate segment 130) is greater than 3.

[0054] For example, the thickness of the two sections of the plate is uniform at 150 mm.

[0055] For example, the thickness of a two-section plate of 150 can be the same as or different from the thickness of a five-section plate of 140.

[0056] For example, the first plate with two segments 150 extends to the end of the first side plate 100 away from the opening 300, and the position of the first plate with two segments 150 corresponds to the position of the electrode assembly 3000 in the battery cell.

[0057] For example, the height ratio of the second section 150 of the first plate to the third section 130 of the first plate can be less than or equal to 40, so as to further reduce the risk of physical defects at the junction of the second section 150 of the first plate and the third section 130 of the first plate.

[0058] For example, the height ratio of a two-section plate 150 to a three-section plate 130 can be 3, 4, 5, 10, 15, 20, 25, 30, 35 or 40.

[0059] If the height ratio of the first plate section 150 to the first plate section 130 is too small, it may cause the size of the first plate section 130 along the height direction of the shell 1000 to be too large, resulting in the included angle b being too small, and the structural reinforcement of the part of the shell 1000 near the opening 300 cannot be achieved by setting the first plate section 120.

[0060] To avoid the above problems, this embodiment designs the height ratio of the first plate segment 150 to the first plate segment 130 to be greater than 3. This allows the material of the first side plate 100 to flow more smoothly and stably during the stamping process to form the housing 1000, avoiding physical defects at the junction of the first plate segment 130 and the adjacent thinner portion. This results in stronger fatigue strength at the junction and also ensures that the thickness of the first plate segment 120 meets the requirements for reinforcing the housing 1000. This helps improve the sealing and safety of the battery cell and effectively expands the internal space of the housing 1000, which in turn helps improve the energy density of the battery cell.

[0061] like Figure 3 In some embodiments, the hardness of the portion of the fourth segment 110 of the plate near the fifth segment 140 of the plate is greater than the hardness of the portion of the third segment 130 of the plate near the second segment 150 of the plate.

[0062] Based on the foregoing, the portion of the first plate, fourth segment 110 near the fifth plate, fourth segment 140, exhibits greater rigidity. This rigidity can reinforce the portion of the casing 1000 near the opening 300, reducing the risk of cracks or splits in the casing 1000 under vibration or repeated pressure. Simultaneously, it can improve the connection strength between the casing 1000 and the cover assembly 2000, ensuring a reliable connection and further enhancing the sealing and safety of the battery cell.

[0063] like Figure 3 In some embodiments, the grain spacing of the portion of the fourth segment 110 of the plate near the fifth segment 140 of the plate is smaller than the grain spacing of the portion of the third segment 130 of the plate near the second segment 150 of the plate.

[0064] As described above, by designing the included angle α, the grain spacing of the portion of the four-segment plate 110 near the five-segment plate 140 can be refined due to compression during the stamping process of the housing 1000. This helps to strengthen the structure of the four-segment plate 110, reducing the risk of cracks or splitting in the housing 1000 under vibration or repeated compression. Simultaneously, it also improves the connection strength between the housing 1000 and the cover assembly 2000, ensuring a reliable connection and further enhancing the sealing and safety of the battery cell.

[0065] like Figure 3 In some embodiments, the dimension L4 of the four segments 110 of the plate is 0.1 mm to 1 mm along the height direction of the housing 1000.

[0066] For example, L4 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0067] The problems caused by an excessively large or small L4 value are similar to those mentioned above, and will not be repeated here.

[0068] The beneficial effects achieved by designing L4 to be 0.1mm to 1mm in this embodiment are similar to the beneficial effects achieved by designing the height ratio of a five-segment plate 140 to a four-segment plate 110 to be 1 to 30, as described above, and will not be repeated here.

[0069] like Figure 3 In some embodiments, along the height direction of the housing 1000, the dimension L1 of a plate segment 120 is 3mm to 30mm.

[0070] For example, L1 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, 25mm or 30mm.

[0071] If L1 is too small, it is impossible to strengthen the structure of the part of the housing 1000 near the opening 300 by setting a plate and section 120; if L1 is too large, the thicker plate and section 120 will occupy too much space inside the housing 1000, which is not conducive to improving the energy density of the battery cell.

[0072] In this embodiment, L1 is designed to be 3mm to 30mm. This can strengthen the structure of the housing 1000 near the opening 300 by setting a plate and a section 120, reducing the risk of cracks, splits or irreversible deformation of the housing 1000. It also helps to expand the space inside the housing 1000 for setting the electrode assembly 3000, which is beneficial to improving the energy density of the battery cell.

[0073] like Figure 3 In some embodiments, along the height direction of the housing 1000, the dimension L3 of the three-section plate 130 is 1mm to 20mm.

[0074] For example, L3 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm or 20mm.

[0075] If L3 is too large, the included angle b will be too small, making it impossible to achieve structural reinforcement of the portion of the shell 1000 near the opening 300 by setting a single plate and section 120. If L3 is too small, the included angle b will be too large, which will cause the material flow of the first side plate 100 to be obstructed during the stamping process of the shell 1000, resulting in physical defects at the junction of the single plate and section 130 and the single plate and section 140.

[0076] To avoid the above problems, in this embodiment, L3 is designed to be 1mm to 10mm. This allows the material of the first side plate 100 to flow more smoothly and stably during the stamping process to form the housing 1000. It also prevents physical defects from occurring at the junction of the three sections 130 of the plate and the adjacent thinner sections, thus giving the junction strong fatigue strength. Furthermore, it ensures that the thickness of the section 120 of the plate meets the requirements for reinforcing the housing 1000, which helps to improve the sealing and safety of the battery cell.

[0077] like Figure 3 In some embodiments, along the height direction of the housing 1000, the dimension L5 of the five-segment plate 140 is 1mm to 3mm.

[0078] For example, L5 can be 1mm, 1.5mm, 2mm, 2.5mm or 3mm.

[0079] If L5 is too large, the placement of section 120 on the first side plate 100 will be too low, limiting the height of the electrode assembly 3000 and resulting in low utilization of the space 4000 within the battery cell, which is detrimental to improving the energy density of the battery cell. If L5 is too small, as mentioned above, on the one hand, it may result in insufficient space for the cover assembly 2000, and on the other hand, it may result in insufficient space for the thick-walled section of the side plate adjacent to the first side plate 100.

[0080] To avoid the above problems, in this embodiment, L5 is designed to be 1mm to 3mm, which can ensure that there is sufficient space inside the housing 1000 for setting the electrode assembly 3000 and for setting the cover plate assembly 2000. This is beneficial to improving the energy density of the battery cell and can also provide sufficient space for the thick-walled section of the side plate adjacent to the first side plate 100. While ensuring the structural strength of the housing 1000 near the opening 300, it is also convenient for the housing 1000 to be demolded.

[0081] like Figure 3 In some embodiments, along the height direction of the housing 1000, the dimension L2 of the two sections 150 of the plate is not less than 30mm.

[0082] For example, L2 can be 30mm, 35mm, 40mm, 45mm or 50mm.

[0083] If L2 is too small, it will limit the height of the electrode assembly 3000, resulting in low utilization of the space 4000 within the battery cell, which is not conducive to improving the energy density of the battery cell.

[0084] To avoid the above problems, this embodiment designs L2 to be no less than 30mm, which can ensure that there is sufficient space inside the housing 1000 for setting the electrode assembly 3000, which is beneficial to improving the energy density of the battery cell.

[0085] Figure 5 Showing Figure 2 A partial cross-sectional view of section BB.

[0086] like Figure 2 and Figure 5 In some embodiments, the housing 1000 further includes a second side plate 200, wherein the first side plate 100 and the second side plate 200 are arranged circumferentially adjacent to each other along the opening 300; the second side plate 200 includes a second plate section 210, the thickness of the second plate section 210 being greater than the thickness of the other parts of the second side plate 200 excluding the second plate section 210.

[0087] like Figure 2 The shell 1000 can be a square shell, and the opening 300 can be formed by four side plates. The first side plate 100 can be constructed as two side plates that are arranged opposite to each other among the four side plates, and the second side plate 200 can be constructed as two other side plates that are arranged opposite to each other.

[0088] A thicker second plate section 210 is provided on the second side plate 200 adjacent to the first side plate 100, which can further strengthen the structure of the housing 1000. When the housing 1000 is subjected to vibration or repeated compression, the first plate section 120 and the second plate section 210 cooperate to further reduce the risk of cracks, splits, or irreversible deformation of the housing 1000. It can also ensure a reliable connection between the housing 1000 and the cover plate assembly 2000, which helps to improve the sealing and safety of the battery cell.

[0089] like Figure 5 In some embodiments, along the height direction of the housing 1000, a section 210 of the second plate extends from the opening 300 in a direction away from the opening 300.

[0090] In the second side plate 200, the thicker section 210 of the second plate extends upward to the opening 300, which can effectively strengthen the part of the housing 1000 near the opening 300. When the cover plate assembly 2000 covers the opening 300 and is welded to the housing 1000, the thicker section 210 of the second plate can resist the deformation of the housing 1000 caused by welding thermal stress, and helps to increase the width of the welded joint, improve the welding quality, improve the connection reliability between the cover plate assembly 2000 and the housing 1000, and help to improve the sealing and safety of the battery cell.

[0091] Figure 6 A schematic diagram showing a partial structural comparison of the first side plate 100 and the second side plate 200 in the shell 1000 of the second structure is shown.

[0092] like Figure 6 In some embodiments, along the height direction of the housing 1000, the second plate section 210 is located on the side of the first plate section 120 near the opening 300.

[0093] For example, with Figure 6 Taking the direction shown as an example, along the height direction of the housing 1000, the lower edge of the second plate section 210 and the upper edge of the first plate section 120 can be aligned, or they can be spaced apart.

[0094] For example, the thickness of section 120 of a single plate can be the same as or different from the thickness of section 210 of a second plate.

[0095] Plate 120 is the thicker portion of the first side plate 100, and plate 210 is the thicker portion of the second side plate 200. During demolding of the housing 1000, plate 120 and plate 210 will have an interference fit with the stamping die. If plate 120 and plate 210 are aligned along the height direction of the housing 1000, such as... Figure 2 Therefore, at the same height position of the housing 1000, it is necessary to deform outwards simultaneously along the X and Y directions to allow the stamping die to come out of the housing 1000. This requires a large amount of deformation of the housing 1000, which increases the risk of cracks in the housing 1000.

[0096] In this embodiment, the two plates, one section 210 and the one plate, one section 120 are staggered along the height direction of the shell 1000. When the shell 1000 is demolded, the lower part of the shell 1000 only needs to deform along the X direction, and the higher part only needs to deform along the Y direction. This can effectively reduce the amount of deformation at the same height position of the shell 1000, making it easier to demold the shell 1000. This can effectively reduce the risk of cracks in the shell 1000 and help improve the molding quality of the shell 1000.

[0097] like Figure 5 In some embodiments, the second side plate 200 includes two plates and three segments 220. The two plates and three segments 220 extend from the first plate 210 away from the opening 300 and gradually decrease in thickness. The inner wall of the two plates and three segments 220 is inclined relative to the inner wall of the first plate 210 away from the opening 300. The angle c between the extension line of the first plate 210 away from the opening 300 along the height direction of the housing 1000 and the inner wall of the two plates and three segments 220 is 1° to 25°.

[0098] For example, the angle of c can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 12°, 14°, 15°, 16°, 18°, 20°, 22° or 25°.

[0099] It should be noted that, with Figure 5 Taking the structure and orientation shown as an example, the included angle c can be the downward extension of the first segment 210 of the second plate and the inner wall of the third segment 220 of the second plate. Figure 5 The included angle in the cross section shown, or the included angle in other cross sections of the second side plate 200 parallel to this cross section.

[0100] The problems caused by an angle c being too large or too small are similar to those caused by an angle b being too large or too small, and will not be elaborated here.

[0101] The beneficial effects achieved by designing the included angle c to be between 1° and 25° are similar to those achieved by designing the included angle b to be between 1° and 25°, and will not be elaborated further here.

[0102] like Figure 6 In some embodiments, the minimum thickness of the second side plate 200 is less than the minimum thickness of the first side plate 100.

[0103] Combination Figure 6 It can be seen that, along the height direction of the housing 1000, the smaller portion of the second side plate 200 has a larger dimension, while the smaller portion of the first side plate 100 has a smaller dimension. Based on this difference, designing the minimum thickness of the second side plate 200 to be smaller allows for a more uniform and consistent flow of material between the first side plate 100 and the second side plate 200 during the stamping process of the housing 1000. This is especially beneficial at the junction of the first side plate 100 and the second side plate 200, reducing physical defects caused by the difference in material flow between the two side plates. This helps improve the structural strength of the housing 1000, reduces the risk of cracks or splits, and improves the sealing and safety of the battery cells.

[0104] like Figure 6In some embodiments, the second side plate 200 includes a second plate three-segment 220 and a second plate two-segment 230 connected sequentially along the height direction of the housing 1000. The second plate three-segment 220 is connected to the second plate one-segment 210. The thickness of the second plate two-segment 230 is less than the thickness of the second plate three-segment 220 and less than the thickness of the first plate two-segment 150.

[0105] For example, the thickness of the two sections of the two plates is uniform.

[0106] A single plate with two segments 150 forms a thin-walled segment of the first side plate 100, with the minimum thickness of the first side plate 100 located within the single plate with two segments 150. Similarly, a second plate with two segments 230 forms a thin-walled segment of the second side plate 200, with the minimum thickness of the second side plate 200 located within the second plate with two segments 230. It is understandable that the beneficial effect achieved by the thickness of the second plate with two segments 230 being less than the thickness of the single plate with two segments 150 is similar to the beneficial effect achieved by the minimum thickness of the second side plate 200 being less than the minimum thickness of the first side plate 100, and will not be elaborated further here.

[0107] like Figure 5 In some embodiments, along the height direction of the housing 1000, the ratio of the size of the second plate segment 230 to the size of the third plate segment 220 (hereinafter referred to as the height ratio of the second plate segment 230 and the third plate segment 220) is greater than 6.

[0108] For example, the height ratio of the two-section two-plate 230 and the two-section three-plate 220 can be 6, 8, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 or 150.

[0109] For example, the location of a portion of the second plate, second segment 230 corresponds to the location of the electrode assembly 3000 in the battery cell.

[0110] For example, the height ratio of the first plate second section 150 to the first plate third section 130 can be less than or equal to 150, so as to further reduce the risk of physical defects at the junction of the second plate second section 230 and the second plate third section 220.

[0111] If the height ratio of the second plate segment 230 to the third plate segment 220 is too small, it may cause the third plate segment 220 to be too large in the height direction of the shell 1000, resulting in the included angle c being too small, making it impossible to achieve structural reinforcement of the part of the shell 1000 near the opening 300 by setting the second plate segment 210.

[0112] To avoid the above problems, this embodiment designs the height ratio of the second plate segment 230 to the third plate segment 220 to be greater than 6. This allows the material of the second side plate 200 to flow more smoothly and stably during the stamping process to form the housing 1000, avoiding physical defects at the junction of the third plate segment 220 and the second plate segment 230. This results in a stronger fatigue strength at the junction and also ensures that the thickness of the first plate segment 210 meets the requirements for reinforcing the housing 1000, which helps to improve the sealing and safety of the battery cell.

[0113] like Figure 5 In some embodiments, along the height direction of the housing 1000, the dimension L6 of the second plate section 210 is 3mm to 15mm.

[0114] For example, L6 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, 11mm, 12mm, 13mm, 14mm or 15mm.

[0115] The problems caused by an excessively large or small L6 are similar to those caused by an excessively large or small L1, and will not be repeated here.

[0116] The beneficial effects achieved by designing L6 to 3mm to 15mm in this embodiment are similar to the beneficial effects achieved by designing L1 to 3mm to 30mm as described above, and will not be repeated here.

[0117] like Figure 5 In some embodiments, the dimension L8 of the two-plate three-section 220 along the height direction of the housing 1000 is 0.2mm to 5mm.

[0118] For example, L8 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0119] The problems caused by an excessively large or small L8 are similar to those caused by an excessively large or small L3, and will not be repeated here.

[0120] The beneficial effects achieved by designing L8 to 0.2mm to 5mm in this embodiment are similar to the beneficial effects achieved by designing L3 to 1mm to 10mm as described above, and will not be repeated here.

[0121] like Figure 5 In some embodiments, along the height direction of the housing 1000, the dimension L7 of the two plates and two sections 230 is not less than 30mm.

[0122] For example, L7 can be 30mm, 35mm, 40mm, 45mm or 50mm.

[0123] The problems caused by an insufficient L7 are similar to those caused by an insufficient L2, and will not be repeated here.

[0124] The beneficial effects achieved by designing L7 to be no less than 30mm in this embodiment are similar to the beneficial effects achieved by designing L2 to be no less than 30mm as described above, and will not be repeated here.

[0125] like Figure 2 In some embodiments, the outer wall area of ​​the first side plate 100 is smaller than the outer wall area of ​​the second side plate 200.

[0126] In this embodiment, the first side plate 100 is configured as a small-face side plate of the housing 1000, and the second side plate 200 is configured as a large-face side plate of the housing 1000. Based on the foregoing, it can be understood that the dimensions of the first plate segment 150 along the height direction of the housing 1000 are relatively small, while the dimensions of the second plate segment 230 along the height direction of the housing 1000 are relatively large. Configuring the second side plate 200 as a large-face side plate can significantly expand the internal space of the housing 1000, reduce the overall weight of the housing 1000, help reduce the cost of the housing 1000, and increase the energy density of the battery cells.

[0127] like Figure 3 In some embodiments, the outer wall of the first side plate 100 is a flat surface.

[0128] For example, one plate with one section 120, one plate with two sections 150, one plate with three sections 130, one plate with four sections 110, and one plate with five sections 140 are integrally formed and connected.

[0129] Designing the outer wall of the first side panel 100 as a flat surface not only improves the appearance quality of the housing 1000, but also facilitates the stacking of battery cells, allowing more battery cells to be placed in a unit space, which helps to improve the energy density of the battery pack including the battery cells.

[0130] like Figure 5 In some embodiments, the outer wall of the second side plate 200 is a flat surface.

[0131] For example, two plates, one section 210, two plates, two sections 230, two plates, three sections 220, are integrally formed and connected.

[0132] The beneficial effects achieved by designing the outer wall of the second side panel 200 as a flat surface are similar to those achieved by designing the outer wall of the first side panel 100 as a flat surface, and will not be repeated here.

[0133] Figure 7The third type of shell 1000 was demonstrated. Figure 2 Partial cross-sectional diagram of section AA. Figure 8 The third type of shell 1000 was demonstrated. Figure 2 Partial cross-sectional diagram of section BB. Figure 9 A schematic diagram showing a partial structural comparison of the first side plate 100 and the second side plate 200 in the shell 1000 of the third structure is presented.

[0134] like Figure 2 , Figure 7 , Figure 8 and Figure 9 In some embodiments, the housing 1000 has an opening 300 at its end along the height direction of the housing 1000. The housing 1000 includes a first side plate 100 and a second side plate 200 arranged circumferentially adjacent to each other along the opening 300. The first side plate 100 includes a plate segment 120, the thickness of which is greater than the thickness of the other parts of the first side plate 100 except for the plate segment 120. The second side plate 200 includes a second plate segment 210, the thickness of which is greater than the thickness of the other parts of the second side plate 200 except for the second plate segment 210. The plate segment 120 and the second plate segment 210 are staggered along the height direction of the housing 1000.

[0135] In the third type of housing 1000, the first plate section 120 and the second plate section 210 are staggered along the height direction of the housing 1000. Based on the above, it can be seen that in the second type of housing 1000, the first plate section 120 and the second plate section 210 are also staggered along the height direction of the housing 1000. The beneficial effects achieved by the two are similar, and will not be repeated here.

[0136] like Figure 7 In some embodiments, along the height direction of the housing 1000, the inner wall of a plate segment 120 is transitioned to the inner wall of an adjacent portion located on the side away from the opening 300 by an arc surface.

[0137] For example, the curved surface in this embodiment can be a circular arc surface or an irregular curved surface.

[0138] by Figure 7Taking the structure and orientation shown as an example, during demolding of the housing 1000, the stamping die located inside the housing 1000 exits from bottom to top through the opening 300. During the movement of the stamping die, it will have an interference fit with a portion of the three-section plate 130 and the one-section plate 120. If a sharp edge is formed between the three-section plate 130 and the one-section plate 120, material may fall off at the sharp edge when the stamping die squeezes it, forming metal shavings. If these metal shavings are not cleaned up, they may scratch the electrode assembly 3000 inside the housing 1000, adversely affecting the internal insulation performance of the battery cell, and consequently, the safety performance of the battery cell.

[0139] To avoid the above problems, the transition between the first section 120 and the third section 130 of the first plate in this embodiment is through an arc surface, which can avoid the formation of sharp edges between the third section 130 and the first section 120, facilitate the demolding of the casing 1000, reduce the risk of generating metal shavings, and help improve the insulation and safety performance of the battery cell.

[0140] like Figure 8 In some embodiments, along the height direction of the housing 1000, the inner wall of the first section 210 of the second plate is transitioned to the inner wall of the adjacent portion located on the side away from the opening 300 by an arc surface.

[0141] For example, the curved surface in this embodiment can be a circular arc surface or an irregular curved surface.

[0142] by Figure 8 Taking the structure and orientation shown as an example, the transition between the first section 210 of the second plate and the third section 220 of the second plate is through an arc surface. The beneficial effects that can be achieved are similar to those that can be achieved between the first section 120 of the first plate and the third section 130 of the first plate through an arc surface, and will not be elaborated here.

[0143] like Figure 7 In some embodiments, the first side plate 100 includes a plate with two segments 150, which are disposed along the height direction of the housing 1000 on the side of the plate with one segment 120 away from the opening 300; the thickness difference between the plate with two segments 150 and the plate with one segment 120 is... a ranges from 0.1 mm to 0.3 mm.

[0144] For example, a can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm.

[0145] like If a is too small, then expanding the internal space of the shell by setting a thinner two-section plate of 150mm will not be effective. If the value of 'a' is too large, the thickness of the first plate and second section 150 may be too small, resulting in insufficient structural strength. During demolding of the shell 1000, the first plate and second section 150 may undergo irreversible deformation, affecting the molding quality of the shell 1000. At the same time, the first plate and second section 150 is at greater risk of cracking or splitting after being subjected to vibration or repeated compression.

[0146] To avoid the above problems, this embodiment will The design of a is 0.15mm to 0.25mm, which can effectively expand the internal space of the housing 1000 so that the housing 1000 can accommodate larger electrode components 3000, which helps to improve the energy density of the battery cell. It can also ensure that the housing 1000 has high structural strength, reduce the risk of cracks, splits or irreversible deformation of the housing 1000, and help improve the sealing and safety of the battery cell.

[0147] like Figure 8 In some embodiments, the second side plate 200 includes two plates and two sections 230, which are disposed along the height direction of the housing 1000 on the side of the first section 210 away from the opening 300; the thickness difference between the second section 230 and the first section 210 is... b ranges from 0.15 mm to 0.4 mm.

[0148] For example, b can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm or 0.4mm.

[0149] Will The beneficial effects achieved by designing a thickness of 0.15mm to 0.4mm and the The beneficial effects achieved by designs with a thickness of 0.1mm to 0.3mm are similar and will not be elaborated further here.

[0150] like Figure 7 and Figure 8In some embodiments, the first side plate 100 includes a fourth plate segment 110 and a third plate segment 130 respectively disposed on opposite sides of a first plate segment 120 along the height direction of the housing 1000. The fourth plate segment 110 is close to the opening 300; the thickness of the fourth plate segment 110 gradually increases from the side close to the opening 300 toward the first plate segment 120, and the third plate segment 130 extends from the first plate segment 120 away from the opening 300 and gradually decreases in thickness; the second side plate 200 includes a third plate segment 220, which extends from the first plate segment 210 away from the opening 300 and gradually decreases in thickness; along the height direction (Z) of the housing 1000, the sum of the dimensions of the first plate segment 120, the fourth plate segment 110, and the third plate segment 130 is L. A The total dimensions of the two-plate section 210 and the two-plate section 320 are L. B The dimensions of a 130mm three-section board are L3, and the dimensions of a 220mm three-section board are L8. A >L B >L8.

[0151] like Figure 9 In this case, along the height direction of the shell 1000, the second plate and third section 220 is located on the side of the first plate and first section 120 near the opening 300.

[0152] When stamping to form the housing 1000, the first side plate 100 is easier to form than the second side plate 200.

[0153] In this embodiment, the shell 1000 of the third structure is designed as L. A >L B >L8, along the height direction of the housing 1000, the first plate section 120 is located below the second plate section 210. When the housing 1000 is formed by stamping, the first plate section 120 is formed first, and then the second plate section 210 is formed. When the housing 1000 is demolded, under the extrusion of the stamping die, the lower part of the first side plate 100 will deform outward of the housing 1000 first. Then, the higher part of the second side plate 200 (the part adjacent to the opening 300) will deform outward. This facilitates the removal of the stamping die from the housing 1000 and reduces the risk of cracks, splits, or irreversible deformation of the housing 1000, thus helping to improve the sealing and safety of the battery cells.

[0154] like Figure 7 In some embodiments, L A The thickness ranges from 5mm to 30mm.

[0155] For example, L AIt can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 28mm or 30mm.

[0156] L A The problems caused by being too large or too small are similar to those caused by being too large or too small for L4, L1 and L3 mentioned above, and will not be repeated here.

[0157] Understandably, L A The beneficial effects that can be achieved by designing L4, L1 and L3 to their respective size ranges are similar to the beneficial effects that can be achieved by designing L4, L1 and L3 to their respective size ranges, and will not be repeated here.

[0158] like Figure 8 In some embodiments, L B The thickness ranges from 2mm to 10mm.

[0159] For example, L B It can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0160] L B The problems caused by being too large or too small are similar to those caused by being too large or too small for L6 and L8 mentioned above, and will not be repeated here.

[0161] Understandably, L B The beneficial effects that can be achieved by designing L6 and L8 to be between 2mm and 10mm are similar to the beneficial effects that can be achieved by designing L6 and L8 to their respective size ranges, as mentioned above, and will not be repeated here.

[0162] In the aforementioned content, the uniform thickness of section 120, section 150, section 120, section 210, and section 230 means that the thickness of each part is roughly the same. However, from a microscopic perspective, it can be found that the thickness of different areas in each part is not exactly the same.

[0163] like Figure 2 In the housing 1000, the second side plate 200 is a large side plate, the first side plate 100 is a small side plate, and a corner 400 is formed between the first side plate 100 and the second side plate 200.

[0164] Figure 10 A schematic diagram showing the material flow during the stamping process of a shell 1000 with the same degree of thinning of each side panel.

[0165] It should be noted that, Figure 10The first side panel 100, corner 400, and second side panel 200 are horizontally unfolded for easy display.

[0166] Figure 10 The dashed arrows in the diagram represent the material flow of the housing 1000 during stamping. It is understandable that the material flow in both the first side plate 100 and the second side plate 200 will be along the width direction. Figure 10 In the transverse direction (of the curve), the material flow encounters less resistance in the middle region, making material flow relatively easy. However, near the 40° corner, the material flow encounters greater resistance, making material flow relatively difficult. In other words, the amount of material flowing gradually decreases from the middle region towards the region near the 40° corner.

[0167] Meanwhile, for the second side plate 200, its width is larger, resulting in a larger difference in material flow between the middle area and the area near the corner 400; for the first side plate 100, its width is smaller, resulting in a smaller difference in material flow between the middle area and the area near the corner 400. Figure 10 This is reflected in the slope k1 < slope k2.

[0168] Based on the above principles, if the thinning degree of the second side panel 200 (i.e., the thickness difference between the first section 210 and the second section 230 of the second panel) is designed to be the same as the thinning degree of the first side panel 100 (i.e., the thickness difference between the first section 120 and the second section 150 of the first panel), then... Figure 10 If the material flow rate of the second side plate 200 near the corner 400 is less than that of the first side plate 100 near the corner 400, the difference between the two will cause uneven thickness of the corner 400 (between different areas along the width direction), generating stress and increasing the risk of cracks and breakage in the corner 400, which will have an adverse effect on the sealing and safety of the battery cell.

[0169] To avoid the above problems, this embodiment redesigns the thinning degree of the first side plate 100 and the thinning degree of the second side plate 200.

[0170] like Figure 2 , Figure 3 and Figure 5 In some embodiments, the housing 1000 has an opening 300 at its end along the height direction. The housing 1000 includes a first side plate 100 and a second side plate 200, which are circumferentially adjacent to each other along the opening 300 and form a corner 400 between them. The outer wall area of ​​the first side plate 100 is smaller than the outer wall area of ​​the second side plate 200. The first side plate 100 includes a first plate section 120 and a second plate section 150 arranged along the height direction of the housing 1000. The thickness of the first plate section 120 is greater than the thickness of the second plate section 150, and the thickness difference is [missing information]. a; The second side plate 200 includes a first section 210 and a second section 230 of the second plate arranged along the height direction of the shell 1000. The thickness of the first section 210 is greater than the thickness of the second section 230, and the thickness difference is... b; where, along the height direction of the shell 1000, the positions of the first plate, second section 150 and the second plate, second section 230 correspond, and a< b.

[0171] In conjunction with the foregoing, in this embodiment, the outer wall area of ​​the first side plate 100 is smaller than that of the second side plate 200. That is, compared to the second side plate 200, the straight-line distance from the center region of the first side plate 100 to the region near the corner 400 is smaller. Therefore, the material feed rate of the region near the corner 400 of the first side plate 100 is significantly affected by the degree of thinning. To make the material feed rate of the region near the corner 400 of the first side plate 100 more consistent with that of the region near the corner 400 of the second side plate 200, the degree of thinning of the first side plate 100 can be designed to be less than that of the second side plate 200. a< b.

[0172] Figure 11 Showing a< A schematic diagram of material flow during the stamping process of shell 1000 (b).

[0173] like Figure 11 In contrast a = The structure of b, when a< When b, the material flow rate of the area of ​​the first side plate 100 near the corner 400 is more consistent with the material flow rate of the area of ​​the second side plate 200 near the corner 400. The thickness of different areas of the corner 400 along the width direction tends to be the same, which effectively reduces the risk of stress at the junction of the thicker and thinner areas of the corner 400, helps to improve the structural strength of the corner 400, reduces the risk of cracks and splits, and helps to improve the sealing and safety of the battery cell.

[0174] like Figure 2 , Figure 3 and Figure 5 In some embodiments, the width of the inner wall of the first side plate 100 is Wa, the width of the inner wall of the second side plate 200 is Wb, and the width direction of the first side plate 100 and the width direction of the second side plate 200 are both perpendicular to the height direction of the housing 1000. The ratio of b to Wb is not less than The ratio of a to Wa.

[0175] In this embodiment, .

[0176] Based on the foregoing, it can be seen that the material feed rate of the area near the corner 400 of the first side plate 100 and the material feed rate of the area near the corner 400 of the second side plate 200 are both affected by their respective thinning degree and their respective width.

[0177] In the foregoing embodiments, based on determining the relationship between the thinning degrees of the first side plate 100 and the second side plate 200, the inner wall width Wa of the first side plate 100 and the inner wall width Wb of the second side plate 200 are combined with... a and The relationship between b is optimized to further reduce the difference between the material flow rate of the first side plate 100 near the corner 400 and the material flow rate of the second side plate 200 near the corner 400, so that the thickness between different areas of the corner 400 along the width direction is further made more uniform. This can further improve the structural strength of the corner 400, reduce the risk of cracks or even breakage, and improve the sealing and safety of the battery cell.

[0178] like Figure 3 and Figure 5 In some embodiments, the thickness of the two 150mm sections of the plate is H. a The thickness of the two sections of the 230 plate is H. b ; a and H a The ratio and b and H b The absolute value of the difference between the two ratios is no greater than 0.1.

[0179] In this embodiment, ≤0.1, for example, can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1.

[0180] In determining a and Based on the size relationship of b, the thickness of the first side plate after thinning by 100 should also be considered, i.e., H. a And the thickness of the second side plate after thinning, i.e., H b ,right a and The relationship between b needs further optimization.

[0181] like and If the difference between the two is too large, it will lead to a large difference in the material flow of the first side plate 100 and the second side plate 200, which will increase the risk of physical defects in the shell 1000 and have an adverse effect on the molding quality and structural strength of the shell 1000.

[0182] To avoid the above problems, this embodiment will Designed for ≤0.1, making and The material flow of the first side plate 100 and the second side plate 200 is made more uniform during the stamping of the housing 1000. This helps to improve the forming quality and structural strength of the first side plate 100, the corner 400 and the second side plate 200, reduce the risk of cracks or even breakage in the housing 1000, and improve the sealing and safety of the battery cells.

[0183] like Figure 5 In some embodiments, b and H b The ratio is between 0.25 and 0.4.

[0184] In this embodiment, 25% ≤ ≤40%, for example, it can be 25%, 30%, 35% or 40%.

[0185] like If the thickness is too small, then setting a thinner two-plate, two-section 230 will not significantly expand the internal space of the casing 1000, and correspondingly, the effect of increasing the energy density of the battery cells will also be limited. If If the thickness is too large, the second plate and second section 230 may be too thin, resulting in insufficient structural strength. During demolding of the shell 1000, the second plate and second section 230 may undergo irreversible deformation, affecting the molding quality of the shell 1000. At the same time, the second plate and second section 230 is at greater risk of cracking or splitting after being subjected to vibration or repeated compression.

[0186] To avoid the above problems, this embodiment will The design of 0.25 to 0.4 can effectively expand the internal space of the housing 1000 so that the housing 1000 can accommodate larger electrode components 3000, which helps to improve the energy density of the battery cell. At the same time, it can ensure that the housing 1000 has high structural strength, reduce the risk of cracks, splits or irreversible deformation of the housing 1000, and help improve the sealing and safety of the battery cell.

[0187] like Figure 3 In some embodiments, a and H a The ratio is between 0.25 and 0.35.

[0188] In this embodiment, 25% ≤ ≤35%, for example, it can be 25%, 27%, 30%, 32% or 35%.

[0189] Problems caused by being too large or too small The problems caused by being too large or too small are similar, and will The beneficial effects achieved by designing values ​​between 0.25 and 0.35 are related to... The beneficial effects achieved by designs with values ​​between 0.25 and 0.4 are similar and will not be elaborated further here.

[0190] Figure 12 Showing Figure 3 Partial cross-sectional diagram of section DD. Figure 13 The thickness measurement data for various regions of the second side panel 200 are shown. Figure 14 The thickness measurement data for each region of the first side panel 100 are shown.

[0191] like Figure 12 and Figure 14 In some embodiments, in the first side panel 100, along the width direction of the first side panel 100 (e.g. Figure 12 The thickness of the middle region is less than the thickness of the region near the corner 400; the width direction of the first side plate 100 is perpendicular to the height direction of the shell 1000.

[0192] Understandably, in a single battery cell, the electrode assembly 3000 primarily compresses the second side plate 200 during expansion, while the first side plate 100 experiences less compressive force. Therefore, the risk of the first side plate 100 cracking due to the compression from the electrode assembly 3000 is relatively low. In other words, the structural strength requirements for the first side plate 100 are lower.

[0193] Therefore, in this embodiment, designing the thickness of the middle region of the first side plate 100 to be relatively small can effectively reduce the material cost of the casing 1000, which is beneficial for mass production. At the same time, designing the thickness of the region of the first side plate 100 near the corner 400 to be relatively large can ensure that the thickness of different regions along the width direction of the corner 400 is relatively uniform, which helps to reduce the risk of cracks or splits at the corner 400 and helps to improve the sealing and safety of the battery cell.

[0194] like Figure 12 and Figure 13 In some embodiments, in the second side panel 200, along the width direction of the second side panel 200 (e.g. Figure 12The thickness of the middle region is greater than the thickness of the region near the corner 400 (in the X direction); the width direction of the second side plate 200 is perpendicular to the height direction of the shell 1000.

[0195] Understandably, when the electrode assembly 3000 expands, the expansion at its center will be greater than that near its edges. In conjunction with the foregoing, the expansion of the electrode assembly 3000 primarily compresses the second side plate 200, and the compressive force applied to the central region of the second side plate 200 is greater than the compressive force applied to the region near the corner 400. In other words, the structural strength requirement for the central region of the second side plate 200 is higher.

[0196] Therefore, in this embodiment, designing the thickness of the middle region of the second side plate 200 to be relatively large can effectively improve the structural strength of the middle region of the second side plate 200, making it less prone to damage when subjected to pressure from the electrode assembly 3000, thus helping to improve the sealing and safety of the battery cell. Simultaneously, designing the thickness of the region of the second side plate 200 near the corner 400 to be relatively small ensures that the thickness of different regions along the width direction of the corner 400 is more uniform, helping to reduce the risk of cracks or splitting at the corner 400.

[0197] In order to make the material flow of the first side plate 100 and the second side plate 200, especially the first plate two-section 150 and the second plate two-section 230 more uniform, it is necessary to design the thickness of different regions along the width direction in the first side plate 100 and the thickness of different regions along the width direction in the second side plate 200.

[0198] Specifically, such as Figure 12 In some embodiments, in the first side plate 100, the thickness H in the middle region is... e Thickness H of the area near the 40° corner E The difference between them is e; In the second side plate 200, the thickness H in the middle region D Thickness H of the area near the 40° corner d The difference between them is d; e and H E The ratio is not less than d and H D The ratio of .

[0199] In this embodiment, ≥ .

[0200] Based on the material flow pattern of the first side plate 100 and the second side plate 200 during the stamping of the housing 1000, this embodiment will... and Designed for ≥ This ensures that the material flow of the first side plate 100 and the second side plate 200, especially the first plate two-section 150 and the second plate two-section 230, is more uniform during the stamping of the housing 1000. This helps to improve the forming quality and structural strength of the first side plate 100, the corner 400 and the second side plate 200, reduce the risk of cracks or even breakage in the housing 1000, and improve the sealing and safety of the battery cells.

[0201] In some embodiments, e and H E The ratio and d and H D The difference between the two ratios is between 0 and 0.1.

[0202] In this embodiment, 0≤ - ≤0.1, for example, - It can be 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1.

[0203] like and If the difference between the two is too large, it will lead to a large difference in the material flow of the first side plate 100 and the second side plate 200, which will increase the risk of physical defects in the shell 1000 and have an adverse effect on the molding quality and structural strength of the shell 1000.

[0204] To avoid the above problems, this embodiment will - Designed to be 0 to 0.1, so that and The material flow of the first side plate 100 and the second side plate 200 is made more uniform during the stamping of the housing 1000. This helps to improve the forming quality and structural strength of the first side plate 100, the corner 400 and the second side plate 200, reduce the risk of cracks or even breakage in the housing 1000, and improve the sealing and safety of the battery cells.

[0205] like Figure 3 , Figure 5 and Figure 12 In some embodiments, the corner 400 is a rounded corner, and the radius of the portion of the inner side of the corner 400 located between the first plate segment 150 and the second plate segment 230 is R. 内The radius of the outer surface of the 40° corner is R. 外 The thickness of the two sections of the plate is 150, which is H. a The thickness of the two sections of the 230 plate is H. b ;R 内 -(H b +0.2)<R 外 <R 内 +H a .

[0206] If R 外 With R 内 If the difference is too large, it will result in an excessively thick corner 400, and a significant thickness difference between it and the first side plate 100 and the second side plate 200 at the same height in the shell 1000. This can easily lead to stress concentration at the junction of corner 400 and the first side plate 100, and at the junction of corner 400 and the second side plate 200, thus increasing the risk of cracks, splits, or irreversible deformation at these junctions. Similarly, if R... 外 With R 内 If the difference is too small, the thickness of the corner 400 will be too small. There will still be a significant thickness difference between the first side plate 100 and the second side plate 200 at the same height in the shell 1000. This will not only make stress concentration more likely at the junction, but also result in lower structural strength of the transition. Consequently, there is a higher risk of cracks, fissures or irreversible deformation at the junction and corner 400.

[0207] To avoid the above problems, this embodiment will use R 外 Designed for R 内 -(H b +0.2)<R 外 <R 内 +H a This helps to make the thickness of the first side plate 100, the corner 400 and the second side plate 200 at the same height position in the housing 1000 more uniform and the tensile strength consistent, which helps to reduce the risk of cracks, splits or irreversible deformation of the housing 1000, thereby improving the sealing and safety of the battery cell.

[0208] like Figure 3 , Figure 5 and Figure 12 In some embodiments, R 内 -(H b +0.2)<R 外 <R 内 -H b .

[0209] In order to further make the thickness of the first side plate 100, the corner 400 and the second side plate 200 at the same height position in the housing 1000 more uniform, this embodiment further limits the R outside, so as to further reduce the risk of cracks, splits or irreversible deformation of the housing 1000 and improve the sealing and safety of the battery cell.

[0210] like Figure 5 and Figure 12 In some embodiments, in the second side plate 200, the thickness of the intermediate region along the width direction of the second side plate 200 is H. D The thickness of the area near the 400° corner is H. d H D With H d The difference is d, d and H D The ratio is the lateral thickness change rate K; the two-section 230 includes a first section 231 and a second section 232 arranged along the height direction of the housing 1000, and the second section 232 extends to the end of the housing 1000 away from the opening 300; the lateral thickness change rate of the first section 231 is greater than the lateral thickness change rate of the portion of the second side plate 200 excluding the first section 231.

[0211] Along the height direction of the casing 1000, the second section 1 231 is located between the second plate 1 210 and the second section 232, that is, the second section 1 231 corresponds to the center position of the electrode assembly 3000. As mentioned above, the center position of the electrode assembly 3000 expands significantly. To resist the large compressive force exerted on the second side plate 200 by the center position of the electrode assembly 3000, this embodiment designs a relatively large lateral thickness variation rate for the second section 1 231. In other words, compared to the area near the corner 400, the thickness increase in the middle region of the second section 1 231 is greater. Therefore, the structural strength of the middle region of the second section 1 231 is correspondingly greater, meeting the requirement to resist the compressive force of the electrode assembly 3000. This helps reduce the risk of cracks, splits, or irreversible deformation of the second side plate 200 after repeated compression by the electrode assembly 3000, improving the sealing and safety of the battery cell.

[0212] like Figure 5 In some embodiments, the lateral thickness variation rate of section 210 of the second plate is K1, the lateral thickness variation rate of section 231 is K2, and the lateral thickness variation rate of section 232 is K3, where K2 > K1 > K3.

[0213] The beneficial effects of maximizing K2 have been explained above and will not be repeated here.

[0214] For the second plate section 210, which is located at the opening 300 of the housing 1000, the second plate section 210 will bear the thermal stress generated by welding when the cover plate assembly 2000 is welded to the housing 1000. In order to reduce the risk of deformation of the opening 300 of the housing 1000 during welding, the structural strength requirements of the second plate section 210 will also be higher.

[0215] Understandably, for the second plate section 210, the area near the corner 400 is constrained by the first side plate 100 and the corner 400, resulting in a lower risk of deformation. However, the middle area is far from the corner 400, and is less constrained by the first side plate 100 and the corner 400, resulting in a higher risk of deformation. Therefore, designing K2 to be larger can increase the structural strength of the middle area of ​​the second plate section 210, better resisting thermal stress, thereby effectively reducing the risk of deformation of the second plate section 210 when welded to the cover plate assembly 2000.

[0216] For the second section 232, which is located at the bottom of the second side plate 200, designing K3 to be smaller can make the thickness of the middle area of ​​the second section 232 similar to the thickness of the area near the corner 400, so that the second section 232 can better provide reliable support for the part above it.

[0217] In some embodiments, K1 is 0.01 to 0.03.

[0218] For example, K1 can be 0.01, 0.02, or 0.03.

[0219] Based on the foregoing, if K1 is too small, it will be impossible to achieve targeted structural reinforcement of the middle area of ​​the second plate section 210, and the risk of deformation in the middle area of ​​the second plate section 210 during welding will be high. If K1 is too large, it will lead to higher material costs for the shell 1000, which is not conducive to the mass production of the shell 1000.

[0220] To avoid the above problems, this embodiment designs K1 to be 0.01 to 0.03, which can not only provide targeted structural reinforcement to the middle area of ​​the second plate section 210, effectively reducing the risk of deformation in the middle area of ​​the second plate section 210, but also help reduce the high material cost of the shell 1000, which is beneficial to the mass production of the shell 1000.

[0221] In some embodiments, K2 is 0.03 to 0.1.

[0222] For example, K2 can be 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1.

[0223] Based on the foregoing, if K2 is too small, it will be impossible to achieve targeted structural reinforcement of the middle area of ​​the second section 231. Under repeated compression from the electrode assembly 3000, the middle area of ​​the second section 231 is at high risk of damage. If K2 is too large, it will lead to higher material costs for the housing 1000, which is not conducive to the mass production of the housing 1000.

[0224] To avoid the above problems, this embodiment designs K2 to be 0.03 to 0.1, which can not only provide targeted structural reinforcement to the middle area of ​​the second section 231, effectively reducing the risk of deformation in the middle area of ​​the second section 231, but also help reduce the high material cost of the shell 1000, which is beneficial to the mass production of the shell 1000.

[0225] In some embodiments, K3 is 0.003 to 0.025.

[0226] For example, K3 can be 0.003, 0.005, 0.007, 0.008, 0.01, 0.013, 0.015, 0.017, 0.018, 0.02, 0.023 or 0.025.

[0227] Based on the foregoing, if K3 is too large, it will result in a large difference in thickness between different regions of the two sections 232 along the width direction, making it difficult to reliably support the part above it.

[0228] To avoid the above problems, this embodiment designs K3 to be 0.003 to 0.025, which can make the thickness of the two sections 232 more uniform in different regions along the width direction, and better provide reliable support for the part located above it.

[0229] like Figure 5 In some embodiments, the dimension L9 of the two sections 232 along the height direction of the housing 1000 is 5mm to 20mm.

[0230] For example, L9 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0231] If L9 is too small, then the corresponding dimension of the second section 231 along the height direction of the housing 1000 (hereinafter referred to as the height of the second section 231) will be too large. As mentioned above, the middle area of ​​the second section 231 is relatively thick. If the height of the second section 231 is too large, it will lead to a higher material cost for the housing 1000, which is not conducive to the mass production of the housing 1000. If L9 is too large, then the area near the upper edge of the second section 232 will be too close to the center of the electrode assembly 3000, and it is prone to damage when subjected to a large compressive force applied by the electrode assembly 3000.

[0232] To avoid the above problems, in this embodiment, L9 is designed to be 5mm to 20mm. This allows the second section 232 to be farther from the center of the electrode assembly 3000 in the height direction of the housing 1000, so that the second section 232 is subjected to less compressive force by the electrode assembly 3000, thereby reducing the risk of the second section 232 being damaged by pressure. It also controls the material cost of the housing 1000 and is conducive to the mass production of the housing 1000.

[0233] Based on the same inventive concept, corresponding to the housing 1000 of any of the above embodiments, this application also provides a battery cell, which has the corresponding technical effects of the housing 1000 of the above embodiments, and will not be repeated here.

[0234] Figure 15 A partial cross-sectional schematic diagram of the battery cell with the second structure is shown.

[0235] like Figure 15 The battery cell provided in this embodiment includes: a housing 1000 as described in the above embodiments; a cover plate assembly 2000, which covers the opening 300 of the housing 1000 and forms a receiving space 4000 with the housing 1000; and an electrode assembly 3000 disposed in the receiving space 4000.

[0236] For example, a single battery cell can be a prismatic battery.

[0237] It should be noted that a battery cell refers to the smallest unit that constitutes a battery module or battery pack. Multiple battery cells can be connected in series and / or in parallel for various applications.

[0238] like Figure 15 In some embodiments, along the height direction of the housing 1000, the cover assembly 2000 is located on the side of the four-section plate 110 near the opening 300.

[0239] In some embodiments, the cover plate assembly 2000 is connected to the second plate section 210.

[0240] The cover assembly 2000 may include a cover 2100 made of metal material, which may overlap the end of the housing 1000 with an opening 300 and seal the opening 300. During welding, the cover 2100 can be welded to the second plate section 210 and the first plate section 140 from above, facilitating operation. After welding, a reliable sealed connection can be achieved between the cover assembly 2000 and the housing 1000.

[0241] The cover plate assembly 2000 also includes a terminal post 2200 penetrating the cover plate. The terminal post 2200 may include a positive terminal post and a negative terminal post, and the terminal post 2200 is insulated and sealed to the cover plate 2100. The electrode assembly 3000 includes multiple positive electrode plates, multiple negative electrode plates, and a separator separating the positive and negative electrode plates. The positive electrode plates, negative electrode plates, and separator can form a stacked structure or a wound structure. A portion of each positive electrode plate extends outward to form a positive electrode tab, which is electrically connected to the positive terminal post. A portion of each negative electrode plate extends outward to form a negative electrode tab, which is electrically connected to the negative terminal post.

[0242] Based on the same inventive concept, corresponding to the battery cell of any of the above embodiments, this application also provides a battery that has the corresponding technical effects of the battery cells of the above embodiments, which will not be repeated here.

[0243] The battery provided in this embodiment includes battery cells as described in the various embodiments above.

[0244] It should be noted that the battery mentioned in this embodiment refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, a battery may include a battery module or a battery pack. The battery may include a housing for encapsulating one or more battery cells, which can prevent liquids or other foreign matter from affecting the battery.

[0245] In order to prepare the housing 1000 of the various embodiments described above, this application also provides a molding die for molding the housing 1000.

[0246] Figure 16 A partial schematic diagram of the molding die is shown. Figure 17 A side view of the punch 5200 in the forming die is shown.

[0247] like Figure 16 and Figure 17 In some embodiments, the forming die is used for forming the housing 1000. The forming die includes: a concave die 5100 having a receiving cavity 5110; and a convex die 5200 for pressing the workpiece into the receiving cavity 5110 to cooperate with the receiving cavity 5110 to extrude the workpiece; the stamping direction of the convex die 5200 is a first direction (e.g., Figure 16In the Z direction), the punch 5200 includes a first end 5210 that first enters the receiving cavity 5110 along the first direction; wherein, the punch 5200 includes a first outer side surface 5220 and a second outer side surface 5230 that are circumferentially adjacent to the first end 5210; the first outer side surface 5220 includes a surface-one region 5221, which is recessed relative to the other regions of the first outer side surface 5220 except for the surface-one region 5221; the second outer side surface 5230 includes two surfaces-one regions 5231, which are recessed relative to the other regions of the second outer side surface 5230 except for the two surfaces-one regions 5231; along the first direction, the edge of the surface-one region 5221 near the first end 5210 and the edge of the two surfaces-one region 5231 near the first end 5210 are spaced apart.

[0248] During the process of forming the shell 1000 by the molding die, the die 5100 can be fixed by structural components such as the lower die base. The punch 5200, driven by the upper die base and other structural components that move up and down, presses the workpiece to be processed into the receiving cavity 5110 through the top opening of the receiving cavity 5110. The outer surface of the punch 5200 and the inner surface of the receiving cavity 5110 cooperate to compress the workpiece to be processed, so that the workpiece to be processed will generate material flow under compression and change its original shape, and finally form the shell 1000 with the preset structure.

[0249] Figure 18 A schematic diagram showing the punch 5200 and the formed housing 1000 is presented. Figure 19 A side view of the punch 5200 and the formed housing 1000 is shown.

[0250] like Figure 18 In the first outer surface 5220, a relatively concave area 5221 is used to form a plate segment 120 of considerable thickness in the housing 1000. For example... Figure 19 In the second outer surface 5230, the relatively recessed two-sided area 5231 is used to form a thicker two-plate section 210 in the housing 1000.

[0251] In order to stagger the first plate segment 120 and the second plate segment 150 along the height direction of the housing 1000, in this embodiment, along the first direction, the edge of the surface region 5221 near the first end 5210 (i.e., Figure 16 The edge of n in the region 5231 and the edge of the region 5231 near the first end 5210 (i.e., Figure 16 The m-edge spacing setting.

[0252] by Figure 16Taking the structure and orientation shown as an example, the edge of the two-sided region 5231 near the first end 5210 is located above the edge of the one-sided region 5221 near the first end 5210. Correspondingly, the shell 1000 formed by the molding die of this embodiment has two plates and one section 210 corresponding to the two-sided region 5231 located above the one plate and one section 120 corresponding to the one-sided region 5221, and the two are staggered.

[0253] The beneficial effects achieved by the staggered arrangement of the first plate section 120 and the second plate section 210 along the height direction of the shell 1000 have been explained in the foregoing and will not be repeated here.

[0254] like Figure 16 and Figure 17 In some embodiments, the second outer surface 5230 further includes a two-sided two-region 5232, which extends from the two-sided one-region 5231 toward the first end 5210 and is inclined in a direction away from the first end 5210; along the first direction, the edge of the two-sided two-region 5232 near the first end 5210 is aligned with the edge of the one-sided one-region 5221 near the first end 5210.

[0255] like Figure 19 The two-sided two-region 5232 is used to form the shell 1000 with two plates and three sections 220 with inclined inner walls. When the shell 1000 is formed by stamping, the two-sided three-section 220 is provided below the two-plate-one-section 210, which allows the material of the second side plate 200 to flow more smoothly and stably, helping to reduce the risk of physical defects in the second side plate 200. At the same time, along the height direction of the shell 1000, the two-sided two-region 5232 and part of the one-sided one-region 5221 are at the same height, providing height space for forming the one-plate-one-section 120, which can ensure that the one-plate-one-section 120 and the two-plate-one-section 210 in the shell 1000 are staggered.

[0256] like Figure 17 In some embodiments, along the first direction, the size of the two-sided two-region 5232 is L. 10 L 10 The thickness ranges from 0.2mm to 5mm.

[0257] For example, L 10 The thickness can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0258] Based on the foregoing, it can be seen that the two-sided, two-region 5232 corresponds to the two-plate, three-segment 220 of the shell 1000. Therefore, L 10The problems caused by an excessively large or small L8 are similar to those caused by an excessively large or small L8 mentioned above, and will not be repeated here.

[0259] L 10 The beneficial effects achieved by designing the L8 to be 0.2mm to 5mm are similar to those achieved by designing the L8 to be 0.2mm to 5mm, and will not be repeated here.

[0260] like Figure 19 In some embodiments, the formed housing 1000 has an opening 300 at the end away from the first end 5210, and along the first direction, the dimension between the edge of the two-sided region 5232 near the first end 5210 and the opening 300 is L. 11 L 11 The thickness ranges from 2mm to 10mm.

[0261] For example, L 11 It can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0262] Based on the foregoing, L 11 Let L be the sum of the dimensions of the two-sided region 5231 and the two-sided region 5232 along the first direction. The two-sided region 5231 is used to form the shell 1000 into a two-plate segment 210, and the two-sided region 5232 is used to form the shell 1000 into a two-plate segment 220. 11 The problems caused by L being too small or too large are similar to those mentioned above. B The problems caused by being too small or too large are similar and will not be elaborated here.

[0263] Understandably, L 11 The beneficial effects that can be achieved by designing for 2mm to 10mm are similar to those mentioned above regarding L. B The beneficial effects achievable with a design thickness of 2mm to 10mm are similar and will not be elaborated upon here.

[0264] like Figure 18 In some embodiments, the first outer surface 5220 further includes a second surface region 5222, which extends from the first surface region 5221 toward the first end 5210 and is inclined in a direction away from the first end 5210; along the first direction, the size of the second surface region 5222 is L. 12 L 12 The thickness ranges from 1mm to 20mm.

[0265] The second area 5222 is used to form a plate with three sections 130 with an inclined inner wall of the housing 1000. When the housing 1000 is formed by stamping, the plate with three sections 130 is provided below the plate with one section 120, which can make the material of the first side plate 100 flow more smoothly and stably, which helps to reduce the risk of physical defects in the first side plate 100.

[0266] L 12 The problems caused by an excessively large or small L3 value are similar to those caused by an excessively large or small L3 value mentioned above, and will not be repeated here.

[0267] This embodiment will use L 12 The beneficial effects achieved by designing L3 to 1mm to 20mm are similar to those achieved by designing L3 to 1mm to 10mm, and will not be repeated here.

[0268] like Figure 18 In some embodiments, the formed housing 1000 has an opening 300 at the end away from the first end 5210, and along the first direction, the dimension between the edge of the two regions 5222 near the first end 5210 and the opening 300 is L. 13 L 13 Greater than 5mm.

[0269] For example, L 13 It can be 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 28mm or 30mm.

[0270] Based on the foregoing, L 13 Let L be the sum of the dimensions of one surface region 5221 and one surface region 5222 along the first direction. One surface region 5222 is used to form the shell 1000 into a plate with three segments 130, and one surface region 5221 is used to form the shell 1000 into a plate with one segment 120, a plate with four segments 110, and a plate with five segments 140. 13 The problems caused by being too small or too large are similar to those caused by being too small or too large for L1, L3, L4 and L5 mentioned above, and will not be repeated here.

[0271] Understandably, L 13 The beneficial effects that can be achieved by designing L1, L3, L4 and L5 to their respective size ranges are similar to the beneficial effects that can be achieved by designing L1, L3, L4 and L5 to their respective size ranges, and will not be repeated here.

[0272] like Figure 18In some embodiments, the angle f between the extension line of one surface region 5221 toward the first end 5210 along the first direction and the second surface region 5222 is greater than the preset angle at the corresponding position on the housing 1000.

[0273] For example, the included angle f is at least 5° greater than the preset angle at the corresponding position on the housing 1000.

[0274] Angle f corresponds to angle b on the housing 1000. During the process of the punch 5200 extruding the workpiece to form the housing 1000, the angle between the inner walls of the three-section plate 130 and the inner walls of the one-section plate 120 on the housing 1000 will be the same as angle f. However, after the housing 1000 is demolded, it will spring back, and the angle between the inner walls of the three-section plate 130 and the one-section plate 120 will decrease, eventually forming angle b. Furthermore, after the housing 1000 springs back, the arc transition structure between the inner walls of the three-section plate 130 and the one-section plate 120 will be retained to facilitate the demolding of the housing 1000.

[0275] like Figure 19 In some embodiments, the angle between the extension line of the second surface region 5231 along the first direction toward the first end 5210 and the second surface region 5232 is h, and the angle h is less than the preset angle at the corresponding position on the housing 1000.

[0276] For example, the included angle h is at least 5° greater than the preset angle at the corresponding position on the housing 1000.

[0277] The beneficial effects achieved by designing the included angle h to be relatively large are similar to those achieved by designing the included angle f to be relatively large, and will not be elaborated further here.

[0278] like Figure 18 In some embodiments, the first outer surface 5220 further includes a three-sided surface 5223, which is located on the side of the one-sided surface 5221 near the first end 5210 along the first direction. The height difference H1 between the one-sided surface 5221 and the three-sided surface 5223 along the direction perpendicular to the first direction is 0.1 mm to 0.3 mm.

[0279] For example, H1 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm.

[0280] The three-section area 5223 is used to form a thinner plate-two-segment 150 in the shell 1000. H1 is the thickness difference between the plate-one-segment 120 and the plate-two-segment 150. Therefore, problems caused by H1 being too large or too small are related to... The problems caused by H1 being too large or too small are similar and will not be elaborated here. Furthermore, the beneficial effects achieved by designing H1 to be 0.1mm to 0.3mm are similar to those achieved by... The beneficial effects achieved by designs with a thickness of 0.1mm to 0.3mm are similar and will not be elaborated further here.

[0281] like Figure 19 In some embodiments, the second outer surface 5230 further includes a two-sided three-region 5233, which is located on the side of the two-sided one-region 5231 near the first end 5210 along the first direction. The height difference H2 between the two-sided one-region 5231 and the two-sided three-region 5233 along the direction perpendicular to the first direction is 0.15mm to 0.4mm.

[0282] For example, H2 can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm or 0.4mm.

[0283] The two-sided, three-region 5233 is used to form the shell 1000 with two plates and two segments 230 of relatively small thickness. H2 is the thickness difference between the first segment 210 and the second segment 230. Therefore, problems caused by H2 being too large or too small are related to... The problems caused by b being too large or too small are similar and will not be elaborated here. Furthermore, the beneficial effects achieved by designing H2 to be 0.15mm to 0.4mm are similar to those achieved by... The beneficial effects achieved by designs with a thickness of 0.15mm to 0.4mm are similar and will not be elaborated further here.

[0284] In some embodiments, during the process of the punch 5200 disengaging from the formed housing 1000, a portion of the housing 1000 and the punch 5200 are interference-fitted, and the interference ratio is 20% to 45%.

[0285] For example, the profit margin can be 20%, 25%, 30%, 35%, 40%, or 45%.

[0286] As described above, during demolding of the casing 1000, the punch 5200 will have an interference fit with the first plate section 120 and the second plate section 210. If the interference ratio is too large, the casing 1000 will deform rapidly during demolding, generating excessive metal shavings. This can lead to cracks or other damage to the casing 1000 and also affect the safety of the battery cells. If the interference ratio is too small, it indicates that the thickness of the first plate section 120 and the second plate section 210 of the casing 1000 does not meet the process requirements, indicating a material shortage problem in the casing 1000.

[0287] To avoid the above problems, this embodiment designs the interference ratio to be 20% to 45%. This ensures that the thickness of the first plate section 120 and the second plate section 210 formed after the casing 1000 is formed meets the process requirements. It also reduces the risk of damage such as cracks or splits in the casing 1000 when it is demolded, which helps to improve the forming quality of the casing 1000 and thus helps to improve the sealing and safety of the battery cell.

[0288] Figure 20 A schematic diagram of a punch 5200 with another structure is shown.

[0289] like Figure 20 In some embodiments, the first end 5210 is uniformly provided with a plurality of elastic members 5240 for supporting the workpiece to be processed.

[0290] For example, the elastic element 5240 can be a spring or other stretchable and deformable structural element.

[0291] For example, 6 to 12 elastic elements 5240 can be provided based on the end face area of ​​the first end 5210.

[0292] By uniformly arranging multiple elastic elements 5240 at the first end 5210 and having the elastic elements 5240 contact the workpiece to be processed, the extrusion force applied by the punch 5200 to the workpiece to be processed can be made more uniform, preventing the workpiece from tilting and ensuring that the stretching and deformation trends of the two first side plates 100 of the housing 1000 are consistent, and the stretching and deformation trends of the two second side plates 200 are consistent, which helps to improve the forming quality of the housing 1000.

[0293] In some embodiments, the surface area of ​​the first outer side 5220 is smaller than the surface area of ​​the second outer side 5230.

[0294] The first outer surface 5220 of the punch 5200 is used to form the first side plate 100 of the housing 1000, i.e., the small side plate; the second outer surface 5230 of the punch 5200 is used to form the second side plate 200, i.e., the large side plate.

[0295] In some embodiments, the axis of the receiving cavity 5110 extends along a first direction, and the receiving cavity 5110 includes a plurality of inner surfaces disposed around its axis, the plurality of inner surfaces being flat surfaces.

[0296] The inner surface of the receiving cavity 5110 is used to form the outer wall of the first side plate 100 and the outer wall of the second side plate 200 of the housing 1000. The inner surface of the receiving cavity 5110 is a flat surface, so that the outer walls of the first side plate 100 and the second side plate 200 can also form flat surfaces. The beneficial effects achieved by the outer walls of the first side plate 100 and the second side plate 200 being flat surfaces have been explained in the foregoing and will not be repeated here.

[0297] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0298] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0299] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0300] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0301] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0302] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A housing, characterized in that, The housing has an opening at one end along its height direction, and the housing includes: The first side plate and the second side plate are arranged adjacent to each other along the circumferential direction of the opening, and a corner is formed between them; the outer wall area of ​​the first side plate is smaller than the outer wall area of ​​the second side plate. The first side plate includes a first plate section and a second plate section disposed along the height direction of the shell, wherein the thickness of the first plate section is greater than the thickness of the second plate section and the thickness difference is [missing information]. a; The second side plate includes a first section and a second section of the second plate disposed along the height direction of the shell, wherein the thickness of the first section of the second plate is greater than the thickness of the second section of the second plate and the thickness difference is [missing information]. b; Wherein, along the height direction of the shell, the positions of the first plate segment and the second plate segment correspond, and a< b.

2. The housing according to claim 1, characterized in that, The width of the inner wall of the first side plate is W. a The width of the inner wall of the second side plate is W. b The width direction of the first side plate and the width direction of the second side plate are both perpendicular to the height direction of the shell; b and W b The ratio is not less than a and W a The ratio of .

3. The housing according to claim 1, characterized in that, 0.1mm≤ a≤0.3mm; and / or 0.2mm< b≤0.4mm。 4. The housing according to claim 1, characterized in that, The thickness of the two sections of the plate is H. a The thickness of the two sections of the two plates is H. b ; a and H a The ratio and b and H b The absolute value of the difference between the two ratios is no greater than 0.

1.

5. The housing according to claim 4, characterized in that, b and H b The ratio is between 0.25 and 0.4; and / or, a and H a The ratio is between 0.25 and 0.

35.

6. The housing according to claim 1, characterized in that, In the first side plate, the thickness of the middle region along the width direction of the first side plate is less than the thickness of the region near the corner; in the second side plate, the thickness of the middle region along the width direction of the second side plate is greater than the thickness of the region near the corner; the width direction of the first side plate and the width direction of the second side plate are both perpendicular to the height direction of the shell.

7. The housing according to claim 1, characterized in that, In the first side plate, the thickness H in the middle region e With the thickness H of the region near the corner E The difference between them is e; In the second side plate, the thickness H in the middle region D With the thickness H of the region near the corner d The difference between them is d; e and H E The ratio is not less than d and H D The ratio of .

8. The housing according to claim 7, characterized in that, e and H E The ratio and d and H D The difference between the two ratios is between 0 and 0.

1.

9. The housing according to claim 1, characterized in that, The corner is rounded, and the radius of the portion of the inner surface of the corner located between the first plate segment and the second plate segment is R. 内 The radius of the outer surface of the corner is R. 外 The thickness of the two sections of the plate is H. a The thickness of the two sections of the two plates is H. b ;R 内 -(H b +0.2)<R 外 <R 内 +H a .

10. The housing according to claim 9, characterized in that, R 内 -(H b +0.2)<R 外 <R 内 -H b 。 11. The housing according to claim 1, characterized in that, Along the height direction of the housing, one section of the first plate is spaced apart from the opening, and one section of the second plate extends to the opening.

12. The housing according to claim 1, characterized in that, The outer wall of the first side plate is a flat surface; and / or, The outer wall of the second side plate has a flat surface.

13. A single battery cell, characterized in that, Includes the housing as described in any one of claims 1-12; A cover assembly that covers the opening of the housing and forms a receiving space with the housing; Electrode assembly, disposed within the receiving space; Wherein, along the height direction of the housing, the cover plate assembly is located on the side of the plate section closest to the opening.

14. A battery, characterized in that, Includes the battery cell as described in claim 13.

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