Battery housing, battery and electrical device

Abstract

A battery housing (10), a battery (100), and an electrical device. The battery housing (10) comprises a housing body (11) and a cover body (30). An accommodating cavity (41) having an opening (110) is formed on the side of the housing body (11) in a third direction, and the cover body (30) is fitted for covering the opening (110). The cover body (30) comprises a main part (31) and an end part (32). The end part (32) is of a step structure and comprises a step main part (321) and a first step wall (50). The step main part (321) comprises a second step wall (51). The first step wall (50) is connected between the second step wall (51) and the main body part (31). A liquid injection hole (34) is formed in the first step wall (51). A post hole (33) is formed in the second step wall (51).

Description

Battery casing, battery and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202322673192.X and application date September 28, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery housing, a battery, and an electrical device. Background Art

[0004] In the related art, the pole is installed on the side of the shell with a smaller area, and the layout space is limited. The pole is often arranged to protrude from the side, which takes up space and is not conducive to the assembly of the battery. Therefore, it is necessary to set a thinning portion on the large surface of the battery. By setting the pole on the thinning portion, the pole can be hidden in the thinning portion, thereby optimizing the spatial layout of the entire battery shell structure.

[0005] However, due to the unreasonable location of the injection hole in the related art, the electrolyte injected into the battery through the injection hole has a low infiltration efficiency on the electrode core. Therefore, improvement is needed.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a battery case, wherein the end of the cover is configured to have a stepped structure, so that the end of the cover and another part of the shell body form a thinned portion with a smaller thickness, the end is configured to include a stepped main portion and a first stepped wall forming the stepped structure, the injection hole is provided in the first stepped wall, and the second stepped wall of the stepped main portion is formed with a pole hole, so that the space at the end of the cover can be fully utilized, so that the pole installed in the pole hole can be hidden in the thinned portion, thereby optimizing the spatial layout of the entire battery case structure, making the overall structure compact, and improving the space utilization of the battery to a certain extent; and because the injection hole is provided in the first stepped wall, the injection hole can be closer to the pole core located in the accommodating cavity, which can optimize the infiltration path of the electrolyte in the pole core, that is, the electrolyte can directly penetrate into the pole core through the gap between the positive electrode sheet, the separator and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0008] The present application proposes a battery having the above-mentioned battery housing.

[0009] The present application also proposes an electrical device having the battery.

[0010] The battery case according to the embodiment of the first aspect of the present application comprises: a shell body, the shell body comprising a bottom plate and side plates extending along the circumference of the bottom plate, the side plates being a plurality of side plates connected in sequence along the circumference of the bottom plate, and the shell body being formed with a receiving cavity having an opening on one side along a third direction; a cover body, the cover body being adapted to cover the opening, the area of ​​the cover body being larger than the area of ​​the side plates; wherein the cover body comprises a main body portion and an end portion, the end portion being connected to one side of the main body portion along a first direction, the first direction intersecting with the third direction, the main body portion and a portion of the shell body constituting a main shell portion, the end portion and another portion of the shell body constituting a thinned portion, At least part of the thinning portion has a dimension in the third direction smaller than that of the main shell portion in the third direction, the end portion includes a step main portion and a first step wall, the step main portion and the first step wall form a step structure, the step main portion includes a second step wall, one end of the first step wall is connected to the main body, and the other end of the first step wall is connected to the second step wall, the first step wall extends along the third direction toward the direction adjacent to the shell body, an angle is formed between the first step wall and the main body and an angle is formed between the first step wall and the second step wall, the first step wall is formed with a liquid injection hole, and the second step wall is formed with a pole hole.

[0011] According to the battery shell of the embodiment of the present application, the end of the cover body is set to a step-like structure, so that the end of the cover body and the other part of the shell body form a thinning portion with a smaller thickness, and the end is set to include a step main part and a first step wall forming a step structure, the injection hole is set on the first step wall, and the second step wall of the step main part is formed with a pole hole. The space at the end of the cover body can be fully utilized, so that the pole installed in the pole hole can be hidden in the thinning portion, thereby optimizing the spatial layout of the entire battery shell structure, making the overall structure compact, and improving the space utilization of the battery to a certain extent; and, since the injection hole is set on the first step wall, the injection hole can be closer to the pole core located in the accommodating cavity, which can optimize the infiltration path of the electrolyte in the pole core, that is, the electrolyte can directly penetrate into the interior of the pole core through the gap between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0012] According to some embodiments of the present application, the dimension of the first step wall in the third direction is W1, the maximum dimension of the injection hole in the third direction is W2, W1 and W2 satisfy: 0.3W1≤W2≤0.8W1, and W1 and W2 are measured in the same unit.

[0013] According to some embodiments of the present application, the connection between the first step wall and the main body is formed as a first rounded corner portion, the radius of the first rounded corner portion is R1, R1 ≥ 0.2 mm; and / or, the connection between the first step wall and the second step wall is formed as a second rounded corner portion, the radius of the second rounded corner portion is R2, R2 ≥ 0.2 mm.

[0014] According to some embodiments of the present application, a matching notch is formed on a side of the side plate facing the cover body, and the end portion matches with the matching notch.

[0015] According to some embodiments of the present application, the main portion of the step also includes a third step wall, one end of which is connected to the second step wall, and the third step wall extends in the third direction toward the direction adjacent to the shell body, and there is an angle between the third step wall and the second step wall.

[0016] According to some optional embodiments of the present application, in the third direction, the size of the first step wall is larger than the size of the third step wall.

[0017] According to some embodiments of the present application, the cover and the shell body are formed independently.

[0018] According to some embodiments of the present application, the end portion of the cover body is formed by bending.

[0019] According to some embodiments of the present application, the side panels and the bottom panel are independently formed.

[0020] According to some embodiments of the present application, the thickness of the side panel is greater than the thickness of the cover body, and / or the thickness of the side panel is greater than the thickness of the bottom panel.

[0021] According to some embodiments of the present application, the side panels are arranged perpendicularly to the main body, and the side panels are arranged perpendicularly to the bottom panel.

[0022] According to the second aspect of the present application, the battery includes: a pole core; a battery shell according to the first aspect of the present application, wherein the pole core is arranged in the accommodating cavity, and the thickness direction of the pole core is consistent with the third direction; and a pole assembly, which is installed in the pole hole and electrically connected to the pole core.

[0023] According to the battery of the embodiment of the present application, by providing the above-mentioned battery shell, the spatial layout of the entire battery shell structure is optimized, making the overall structure compact, which can improve the space utilization of the battery to a certain extent; and, since the injection hole is provided on the first step wall, the injection hole can be closer to the pole core located in the accommodating cavity, which can optimize the infiltration path of the electrolyte in the pole core, that is, the electrolyte can directly penetrate into the interior of the pole core through the gap between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0024] According to some embodiments of the present application, the pole tab of the pole core is located at one end of the pole core adjacent to the end portion, and a projection of the pole tab on the first step wall does not overlap with the liquid injection hole.

[0025] According to some embodiments of the present application, the end face of the pole core opposite to the first step wall is the first end face, and the distance between the first end face and the inner wall surface of the first step wall is H1, and H1 satisfies: 0.2mm≤H1≤3mm.

[0026] According to some embodiments of the present application, a surface of the main body away from the shell body is a first surface, and along the third direction, the pole assembly installed in the pole hole does not exceed the first surface.

[0027] According to some embodiments of the present application, the pole assembly includes a pole, an insulating structure and a connecting gasket, the pole is passed through the pole hole, the insulating structure is located between the pole and the end, the connecting gasket is connected to the pole and is located in the battery casing, and the connecting gasket electrically connects the pole and the corresponding pole ear.

[0028] According to some embodiments of the present application, the pole lugs corresponding to the pole assembly are insulated and separated from the shell body.

[0029] According to some optional embodiments of the present application, an insulating layer is provided between the pole tab corresponding to the pole assembly and the shell body, and the pole tab corresponding to the pole assembly abuts against the insulating layer.

[0030] According to some embodiments of the present application, the pole core is arranged in the main shell, and the pole lugs corresponding to the pole assembly are led out through the pole assembly.

[0031] An electrical device according to an embodiment of the third aspect of the present application includes: a battery according to an embodiment of the second aspect of the present application.

[0032] According to the electrical equipment of the embodiment of the present application, by arranging the above-mentioned battery, the spatial layout of the entire battery shell structure is optimized, so that the overall structure is compact, which can improve the space utilization of the battery to a certain extent; and, since the injection hole is arranged on the first step wall, the injection hole can be closer to the pole core located in the accommodating cavity, which can optimize the infiltration path of the electrolyte in the pole core, that is, the electrolyte can directly penetrate into the interior of the pole core through the gap between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] FIG1 is a schematic diagram of a battery according to some embodiments of the present application;

[0036] FIG2 is an exploded view of the battery in FIG1 ;

[0037] FIG3 is a schematic diagram of the cover and the terminal assembly of the battery housing in FIG1 ;

[0038] FIG4 is a top view of the battery in FIG1 ;

[0039] FIG5 is a cross-sectional view taken along line AA in FIG4 ;

[0040] FIG6 is a partial enlarged view of point D in FIG5 ;

[0041] Figure 7 is a cross-sectional view along line BB in Figure 4;

[0042] FIG8 is a partial enlarged view of point E in FIG7 ;

[0043] FIG9 is a cross-sectional view taken along line CC in FIG4 ;

[0044] FIG10 is a partial enlarged view of point F in FIG9 ;

[0045] FIG11 is a partial enlarged view of point G in FIG9 ;

[0046] FIG12 is a top view of a battery according to some other embodiments of the present application;

[0047] FIG13 is a top view of a battery according to some further embodiments of the present application.

[0048] Figure markings: 100, battery; 10, battery shell; 11, shell body; 110, opening; 12, main shell portion; 13, thinning portion; 20, side panel; 21, first end; 22, second end; 23, matching notch; 30, cover; 31, main body; 32, end; 321, step main portion; 33, pole hole; 34, injection hole; 40, bottom plate; 41, accommodating chamber; 50, first step wall; 51, second step wall; 52, third step wall; 53, first fillet portion; 54, second fillet portion; 55, third fillet portion; 60, sealing assembly; 61, sealing cover; 62, sealing plug; 70, pole core; 71, pole ear. DETAILED DESCRIPTION

[0049] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0050] The battery housing 10 according to an embodiment of the present application will be described below with reference to FIG. 1 to FIG. 13 .

[0051] Referring to Figures 1-11, the battery shell 10 according to the first embodiment of the present application includes a shell body 11 and a cover body 30. The shell body 11 is formed with a accommodating cavity with an opening 110 on one side along the third direction (refer to the e3 direction of Figure 1), and the cover body 30 is suitable for covering the opening 110.

[0052] The housing body 11 includes a bottom plate 40 and side plates 20 extending circumferentially from the bottom plate 40. Multiple side plates 20 are sequentially connected along the circumference of the bottom plate 40. For example, there are four side plates 20, which are sequentially connected along the circumference of the bottom plate 40 to form a frame structure. The area of ​​the cover 30 is larger than that of the side plates 20. This gives the cover 30 a larger area, making it the largest surface of the battery housing 10.

[0053] The cover 30 includes a main body 31 and an end portion 32. The end portion 32 is connected to one side of the main body 31 along a first direction (refer to the direction e1 in FIG. 1 ). The first direction intersects with the third direction. The main body 31 and a portion of the shell body 11 constitute the main shell portion 12. The end portion 32 and another portion of the shell body 11 constitute the thinned portion 13. The dimension d2 of at least a portion of the thinned portion 13 in the third direction is smaller than the dimension d1 of the main shell portion 12 in the third direction. The dimension d2 of at least a portion of the thinned portion 13 in the third direction is smaller than the dimension d1 of the main shell portion 12 in the third direction. That is, the dimension d2 of a portion of the thinned portion 13 in the third direction may be smaller than the dimension d1 of the main shell portion 12 in the third direction, or the dimension d2 of the thinned portion 13 in the third direction may be smaller than the dimension d1 of the main shell portion 12 in the third direction.

[0054] 1-3 and 7-8 , in some embodiments, the end portion 32 is recessed relative to the main body portion 31 toward the accommodating cavity 41. Through this arrangement, the size of the thinned portion 13 in the third direction can be smaller than the size of the main shell portion 12 in the third direction, so that there is enough space at the end portion 32 to set the injection hole 34, which can improve the space utilization of the battery to a certain extent. At the same time, it is also convenient to perform the injection operation at the injection hole 34.

[0055] In some embodiments, the end portion 32 is provided with an injection hole 34, through which electrolyte can be injected into the interior of the battery case 10. The pole core 70 of the battery 100 includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive and negative electrode sheets. The pole core 70 is disposed in the accommodating cavity 41 of the battery case 10, and the electrolyte is then injected into the interior of the battery case 10 through the injection hole 34 at the end portion 32 of the cover 30. Because the injection hole 34 is located at the end portion 32 and on one side of the pole core 70 along the first direction, when the electrolyte is injected into the interior of the battery case 10 through the injection hole 34, the electrolyte can directly penetrate into the interior of the pole core 70 through the gaps between the positive electrode sheet, the separator, and the negative electrode sheet, thereby improving the infiltration efficiency of the electrolyte into the pole core 70 to a certain extent.

[0056] Optionally, referring to Figures 2 and 7-8, a sealing assembly 60 can be provided at the injection hole 34 to seal the injection hole 34. The sealing assembly 60 can include a sealing cover 61 and a sealing plug 62. After the injection is completed, the sealing plug 62 can be first inserted into the injection hole 34, and then the sealing cover 61 can be pressed onto the sealing plug 62. During the pressing process of the sealing cover 61 onto the sealing plug 62, the sealing plug 62 is squeezed, thereby achieving a good sealing effect. At the same time, the sealing assembly 60 is provided at the injection hole 34 located at the step, so that the space at the step can be fully utilized, thereby improving the space utilization of the battery to a certain extent.

[0057] Optionally, the portion of the sealing plug 62 exposed on the surface of the cover body 30 may be larger than the diameter of the liquid injection hole 34 , and the sealing plug 62 and the liquid injection hole 34 may be interference fit.

[0058] Optionally, the battery housing 10 may be made of a metal material such as stainless steel, nickel alloy, chromium alloy or aluminum alloy, and the battery housing 10 may have good electrical conductivity and heat transfer properties.

[0059] 1-3 , according to some embodiments of the present application, the end portion 32 is formed with a pole hole 33 for mounting a pole assembly 80. The end portion 32 of the battery housing 10 is connected to one side of the main body portion 31, and the dimension of the thinned portion 13 in the third direction is smaller than the dimension of the main housing portion 12 in the third direction. The end portion 32 is formed with a pole hole 33 for mounting the pole assembly 80. The pole assembly 80 is mounted at the end portion 32 through the pole hole 33. Therefore, when the overall thickness of the battery is relatively small, the pole assembly 80 can be fixed at the end portion 32, which facilitates the installation and fixation of the pole assembly 80 on the housing 10.

[0060] Referring to Figures 1 to 8, according to some embodiments of the present application, the end portion 32 includes a step main portion 321 and a first step wall 50, the step main portion 321 and the first step wall 50 form a step structure, the step main portion 321 includes a second step wall 51, one end of the first step wall 50 is connected to the main body 31, and the other end of the first step wall 50 is connected to the second step wall 51, the first step wall 50 extends in the third direction toward the direction of the adjacent shell body 11, and has an angle between the first step wall 50 and the main body 31 and an angle between the first step wall 50 and the second step wall 51.

[0061] The second step wall 51 is formed with a terminal hole 33. The end portion 32 includes a first step wall 50 and a step main portion 321. The first step wall 50 is angled with the main portion 31 and the second step wall 51, forming a stepped structure at the end portion 32 of the cover 30. The second step wall 51 is formed with a terminal hole 33, which is used to install the terminal assembly 80. This fully utilizes the space at the end portion of the cover 30, allowing the terminal 81 installed in the terminal hole 33 to be hidden in the thinned portion 13, optimizing the spatial layout of the entire battery housing structure, making the overall structure compact, and to a certain extent improving the space utilization of the battery 100.

[0062] The housing body 11 has a side formed along the third direction with a housing cavity 41, which accommodates the electrode core 70. The end 32 of the cover 30 is provided with a terminal hole 33 for mounting the terminal assembly 80. The housing cavity 41 is used to accommodate the electrode core 70, and the terminal hole 33 provided in the second step wall 51 is used to mount the terminal assembly 80. This allows for a rational layout of the internal space of the battery housing 10, a compact structure, and high space utilization. This improves the energy density of the battery 100 while maintaining a certain size.

[0063] The first step wall 50 is provided with an injection hole 34. This arrangement allows the injection hole 34 to be closer to the electrode core 70, and the injection hole 34 is located on one side of the electrode core 70 along the first direction, which can optimize the electrolyte infiltration path in the electrode core 70. That is, the electrolyte can directly penetrate into the electrode core 70 through the gaps between the positive electrode sheet, the separator, and the negative electrode sheet, thereby improving the injection efficiency to a certain extent.

[0064] According to the battery case 10 of some embodiments of the present application, by setting the end 32 of the cover 30 into a step-like structure, the end 32 of the cover 30 and another part of the shell body 11 form a thinned portion 13 with a smaller thickness, and the end 32 is set to include a step main portion 321 and a first step wall 50 forming a step structure, the injection hole 34 is provided on the first step wall 50, and the second step wall 51 of the step main portion 321 is formed with a pole hole 33, which can fully utilize the space of the end 32 of the cover 30 so that the pole hole 33 can be installed. The pole can be hidden in the thinned portion 13, optimizing the spatial layout of the entire battery shell structure, making the overall structure compact, and improving the space utilization of the battery 100 to a certain extent; and, since the injection hole 34 is provided on the first step wall 50, the injection hole 34 can be made closer to the pole core 70 located in the accommodating cavity 41, which can optimize the infiltration path of the electrolyte in the pole core 70, that is, the electrolyte can directly penetrate into the interior of the pole core 70 through the gap between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0065] 1-3 , according to some embodiments of the present application, the tab 71 of the electrode core 70 is located at one end of the electrode core 70 adjacent to the end portion 32 , and the projection of the tab 71 on the first step wall 50 does not overlap with the injection hole 34 . This arrangement facilitates subsequent injection of electrolyte into the battery 100 through the injection hole 34 , preventing the tab 71 from interfering with the injection operation.

[0066] Referring to Figure 8 , according to some embodiments of the present application, the dimension of the first step wall 50 in the third direction is W1, and the maximum dimension of the injection hole 34 in the third direction is W2. W1 and W2 satisfy the following relationship: 0.3W1≤W2≤0.8W1, with W1 and W2 being expressed in the same unit. This arrangement ensures that the dimensions of the first step wall 50 and the injection hole 34 are moderate and reasonable, facilitating both injection and sealing.

[0067] Referring to Figure 8 , according to some embodiments of the present application, the end surface of the pole core 70 opposite the first step wall 50 is the first end surface 21. The distance between the first end surface 21 and the inner wall surface of the first step wall 50 is H1, and H1 satisfies the following conditions: 0.2 mm ≤ H1 ≤ 3 mm. By setting H1 within this range, sufficient space can be reserved for the injection operation, facilitating the injection operation.

[0068] 4-8 , according to some embodiments of the present application, along the third direction, the surface of the main body 31 away from the bottom plate 40 is a first surface, and the terminal assembly 80 installed in the terminal hole 33 does not extend beyond the first surface. The fact that the terminal assembly 80 does not extend beyond the first surface can improve the space utilization of the battery 100 and increase the energy density of the battery 100 when the battery 100 has a certain size.

[0069] 4-8 , according to some embodiments of the present application, the connection between the first step wall 50 and the main body 31 is formed as a first fillet 53, and the radius of the first fillet 53 is R1, where R1 is ≥ 0.2 mm. By providing the first fillet 53, the transition between the first step wall 50 and the main body 31 is smooth, which can reduce stress concentration at the connection. At the same time, the first fillet 53 can make the appearance of the cover 30 more beautiful. In addition, by providing the first fillet 53, the safety of the battery housing 10 during production, processing, and assembly can be improved to a certain extent.

[0070] 4-8 , the connection between the first step wall 50 and the second step wall 51 is formed as a second fillet 54. The radius of the second fillet 54 is R2, where R2 is ≥ 0.2 mm. The provision of the second fillet 54 provides a smooth transition between the connection between the first step wall 50 and the second step wall 51, thereby reducing stress concentration at the connection. Furthermore, the second fillet 54 enhances the appearance of the cover 30 and, to a certain extent, improves the safety of the battery housing 10 during production, processing, and assembly.

[0071] 1-2 , according to some embodiments of the present application, a mating notch 23 is formed on the side of the side panel 20 facing the shell body 11, and the end portion 32 mates with the mating notch 23. The side panel 20 and the shell body 11 mate with each other via the mating notch 23 and the end portion 32. The mating notch 23 ensures a good mating effect and prevents misalignment during mating, thereby improving positioning accuracy during mating and facilitating processing.

[0072] 1-2 , according to some embodiments of the present application, the shell body 11 includes a bottom plate 40 and a side plate 20 extending along the circumference of the cover 30. The side plate 20 is formed with a matching notch 23, and the step portion 32 is matched with the matching notch 23. During the assembly process of the cover 30 and the side plate 20 of the battery shell 10, the matching notch 23 of the side plate 20 is matched with the end 32 of the cover 30 to limit the position. At this time, the main body 31 of the cover 30 overlaps the rest of the side plate 20. After the limiting is completed, the overlapping portion of the cover 30 and the side plate 20 is connected and positioned. For example, welding can be used for connection and positioning. The assembly process is simple, easy to process, and can ensure the molding effect of the battery shell 10.

[0073] For example, referring to Figures 1 and 2, the two ends of the side plate 20 along the circumferential extension direction of the cover body 30 are respectively a first end 21 and a second end 22, the first end 21 and the second end 22 are spaced apart, and the first end 21 and the second end 22 can each be formed with a matching notch 23, and the step portion 32 can be connected to the first end 21 and the second end 22. The matching notches 23 at the first end 21 and the second end 22 of the side plate 20 can ensure the connection between the side plate 20 and the cover body 30, avoid the occurrence of misalignment during the connection process, improve the positioning accuracy during the connection, facilitate processing, and thus ensure the molding effect of the battery case 10.

[0074] Optionally, the first end 21 and the second end 22 are respectively located on opposite sides of the cover 30 along the second direction (refer to the e2 direction in FIG. 1 ), wherein the first direction, the second direction and the third direction intersect with each other.

[0075] 1-8 , according to some embodiments of the present application, the end portion 32 includes a step main portion 321 and a first step wall 50, the step main portion 321 includes a second step wall 51 and a third step wall 52, one end of the first step wall 50 is connected to the main body portion 31, the other end of the first step wall 50 is connected to the second step wall 51, the first step wall 50 extends in the third direction toward the direction of the adjacent shell body 11, one end of the third step wall 52 is connected to the second step wall 51, the third step wall 52 extends in the third direction toward the direction of the adjacent shell body 11, the first step wall 50 has an angle with the main body portion 31 and an angle with the second step wall 51, and the third step wall 52 has an angle with the second step wall 51.

[0076] The main step portion 321 includes a second step wall 51 and a third step wall 52. There is an angle between the first step wall 50 and the main body portion 31 and the second step wall 51, and there is an angle between the third step wall 52 and the second step wall 51, so that the cover body 30 forms a step-like structure with a simple and reasonable structure and high space utilization, which can improve the energy density of the battery 100 to a certain extent.

[0077] For example, referring to Figures 1-2 , the two ends of the side panel 20 along the circumferential extension direction of the cover 30 are respectively a first end 21 and a second end 22. The first end 21 and the second end 22 are spaced apart, and each of the first end 21 and the second end 22 may be formed with a mating notch 23. The step portion 32 may connect to the first end 21 and the second end 22, respectively. The first end 21 and the second end 22 are located on opposite sides of the cover 30 along the second direction (referring to the direction e2 in Figure 1 ). The third step wall 52 of the step portion 32 may connect the first end 21 and the second end 22, and the main step portion 321 and another portion of the shell body 11 form a thinned portion 13. This arrangement allows the third step wall 52 to connect with the mating notches 23 of the first end 21 and the second end 22, thereby ensuring a secure connection between the side panel 20 and the cover 30, preventing misalignment during the connection process, improving positioning accuracy during connection, and facilitating processing, thereby ensuring a well-formed battery housing 10.

[0078] Referring to Figures 1-8, according to some embodiments of the present application, in the third direction, the dimensions of the first step wall 50 are larger than those of the third step wall 52. This arrangement can improve the space utilization of the battery 100 and increase the energy density of the battery 100. The relatively large dimensions of the first step wall 50 provide sufficient operating space, facilitating the injection operation and sealing after the injection is completed. The dimensions of the third step wall 52 are compatible with the thickness of the terminal assembly 80, which can rationalize the internal space layout of the battery housing 10 and make the structure more compact.

[0079] 4-8 , in some embodiments, the connection between the third step wall 52 and the second step wall 51 is formed as a third fillet 55 , and the radius of the third fillet 55 is R3, R3 ≥ 0.2 mm. By providing the third fillet 55 , the connection between the third step wall 52 and the second step wall 51 is smoothly transitioned, which can reduce stress concentration at the connection. At the same time, the third fillet 55 can make the appearance of the cover 30 more beautiful. In addition, by providing the third fillet 55 , the safety of the battery case 10 during production, processing, and assembly can be improved to a certain extent.

[0080] 1-3 , the cover 30 and the shell body 11 are formed independently, and the cover 30 is processed into a stepped shape alone. Compared with other processing methods, for example, the cover 30 and the side panel 20 are integrally formed, the process difficulty is lower, and the difficulty of processing and forming the battery shell 10 can be reduced. It can also be applied to battery shells 10 of different shapes and material thicknesses, with a wide range of applications and high flexibility.

[0081] 1-4 , according to some embodiments of the present application, the end portion 32 of the cover 30 is formed by a bending process. The bending process is relatively simple and facilitates the forming of the end portion 32 . Furthermore, the bending process is suitable for processing a variety of materials of varying thicknesses, offering a wide range of applications and high flexibility.

[0082] 1-4 , according to some embodiments of the present application, the housing body 11 includes a bottom plate 40 and side plates 20 extending circumferentially of the cover 30, with the side plates 20 and bottom plate 40 being independently molded. Separately molding the side plates 20, cover 30, and bottom plate 40 reduces the complexity and facilitates fabrication compared to other molding methods, such as integrally molding the cover 30 and side plates 20 or integrally molding the bottom plate 40 and side plates 20.

[0083] For example, referring to FIG. 12-FIG . 13 , the side panel 20 can be formed by a bending process. The bending process has a low process difficulty and can facilitate the processing and forming of the side panel 20 .

[0084] In addition, the bending process is suitable for processing battery casings 10 of different material thicknesses and shapes, with a wide range of applications and high flexibility. For example, referring to Figures 12 and 13, the side panels 20 can be formed into a variety of different shapes by bending, and the cover 30 and bottom panel 40 can be adapted according to the shape of the side panels 20 to form battery casings 10 of different shapes. Therefore, this processing method has a wide range of applications and high flexibility.

[0085] 9-11 , according to some embodiments of the present application, the housing body 11 includes a bottom plate 40 and a side plate 20 extending circumferentially of the cover 30 , wherein the thickness of the side plate 20 is greater than the thickness of the cover 30 . The thicker side plate 20 has higher mechanical strength, thereby ensuring the structural strength of the battery housing 10 . Furthermore, the thicker side plate 20 increases the contact area between the side plate 20 and the cover 30 and bottom plate 40 , facilitating processing and fixing.

[0086] 9-11 , according to some embodiments of the present application, the housing body 11 includes a bottom plate 40 and a side plate 20 extending circumferentially of the cover 30 , wherein the thickness of the side plate 20 is greater than that of the bottom plate 40. The thicker side plate 20 has higher mechanical strength, thereby ensuring the structural strength of the battery housing 10 . Furthermore, the thicker side plate 20 can increase the contact area between the side plate 20 and the cover 30 and bottom plate 40 , facilitating processing and fixing.

[0087] Optionally, the side panel 20 and the cover body 30 as well as the side panel 20 and the bottom panel 40 may be connected by welding or bonding.

[0088] 9-11 , according to some embodiments of the present application, the housing body 11 includes a bottom plate 40 and a side plate 20 extending along the circumference of the cover 30. The side plate 20 is disposed perpendicularly to the main body 31, and the side plate 20 is disposed perpendicularly to the bottom plate 40. The side plate 20 is vertically connected to the main body 31 of the cover 30 and the bottom plate 40. This arrangement increases the size of the accommodating cavity 41 within the battery housing 10 while maintaining a certain size of the battery housing 10, thereby improving the space utilization within the battery housing 10 and thereby increasing the energy density of the battery 100.

[0089] 1-13 , a battery 100 according to an embodiment of the second aspect of the present application includes a battery housing 10, a pole core 70, and a pole assembly 80 according to the embodiment of the first aspect of the present application. The pole core 70 is disposed within the accommodating cavity 41. The battery housing 10 has a pole hole 33. The thickness direction of the pole core is consistent with the third direction. The pole assembly 80 is installed in the pole hole 33 and is electrically connected to the pole core 70.

[0090] The pole core 70 can be arranged in the accommodating cavity 41 formed on one side of the shell body 11 along the third direction, and the pole assembly 80 is installed at the end 32 of the cover body 30 through the pole hole 33. Therefore, the space layout inside the battery shell 10 is reasonable, the space utilization rate of the battery 100 is high, and the energy density of the battery 100 can be improved to a certain extent.

[0091] According to the battery 100 of the embodiment of the present application, by providing the above-mentioned battery shell 10, when the electrolyte is injected into the interior of the battery shell 10 through the injection hole 34, the electrolyte can directly penetrate into the interior of the electrode core 70 through the gaps between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the infiltration efficiency of the electrolyte into the electrode core 70.

[0092] In addition, the spatial layout of the entire battery shell structure can be optimized, making the overall structure compact, which can improve the space utilization of the battery 100 to a certain extent; and, since the injection hole 34 is provided on the first step wall 50, the injection hole 34 can be closer to the pole core 70 located in the accommodating cavity 41, which can optimize the infiltration path of the electrolyte in the pole core 70, that is, the electrolyte can directly penetrate into the pole core 70 through the gap between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0093] 1-3 , according to some embodiments of the present application, the tab 71 of the electrode core 70 is located at one end of the electrode core 70 adjacent to the end portion 32 , and the projection of the tab 71 on the first step wall 50 does not overlap with the injection hole 34 . This arrangement facilitates subsequent injection of electrolyte into the battery 100 through the injection hole 34 , preventing the tab 71 from interfering with the injection operation.

[0094] Referring to Figure 8 , according to some embodiments of the present application, the end surface of the pole core 70 opposite the first step wall 50 is the first end surface 21. The distance between the first end surface 21 and the inner wall surface of the first step wall 50 is H1, and H1 satisfies the following conditions: 0.2 mm ≤ H1 ≤ 3 mm. By setting H1 within this range, sufficient space can be reserved for the injection operation, facilitating the injection operation.

[0095] 4-8 , according to some embodiments of the present application, along the third direction, the surface of the main body 31 away from the bottom plate 40 is a first surface, and the terminal assembly 80 installed in the terminal hole 33 does not extend beyond the first surface. The fact that the terminal assembly 80 does not extend beyond the first surface can improve the space utilization of the battery 100 and increase the energy density of the battery 100 when the battery 100 has a certain size.

[0096] 5-6 and 9-10, according to some embodiments of the present application, the pole assembly 80 includes a pole 81, an insulating structure 83, and a connecting gasket 82. The pole 81 is inserted into the pole hole 33. The insulating structure 83 is located between the pole 81 and the end 32. The connecting gasket 82 is connected to the pole 81 and is located within the battery housing 10. The connecting gasket 82 electrically connects the pole 81 with the corresponding pole lug 71. During the assembly of the pole assembly 80 with the battery housing 10, the pole assembly 80 passes through the insulating structure 83 and the connecting gasket 82 in sequence from the outside to the inside of the battery housing 10. The connecting gasket 82 is electrically connected to the pole 81 and the corresponding pole lug 71, and the assembly process is simple.

[0097] The insulating structure 83 can insulate the terminal 81 from the shell body 11, preventing the battery 100 from short-circuiting due to contact between the two. The connecting gasket 82 can increase the contact area between the terminal assembly 80 and the terminal lug 71, thereby improving the connection effect.

[0098] Optionally, the electrical connection between the pole assembly 80 and the tab 71 may be achieved by welding or bonding.

[0099] Optionally, another tab 71 of the electrode assembly can be electrically connected to the battery housing 10 , and after the connection is completed, it and the tab 71 connected to the pole 81 form the positive and negative poles of the battery 100 .

[0100] Optionally, both the insulating structure 83 and the connecting gasket 82 may be provided with through holes, and the through holes of the insulating structure 83 and the connecting gasket 82 are concentrically arranged with the pole hole 33 to facilitate assembly of the pole assembly 80 .

[0101] Optionally, the insulating structure 83 may be provided with a first insulating member 83a and a second insulating member 83b in sequence along the direction of the pole 81 to insulate and protect the pole 81 and the inner and outer surfaces of the shell body 11 respectively, thereby ensuring the insulation effect.

[0102] 5-6 and 9-10 , according to some embodiments of the present application, the tabs 71 corresponding to the terminal assembly 80 are insulated from the housing 11. This arrangement insulates the tabs 71 corresponding to the terminal assembly 80 from the housing 11, preventing a short circuit in the battery 100 caused by contact between the tabs 71 and the housing 11.

[0103] 5-6 and 9-10 , according to some embodiments of the present application, an insulating layer 84 is provided between the tabs 71 corresponding to the electrode assembly 80 and the housing body 11, and the tabs 71 corresponding to the electrode assembly 80 abut against the insulating layer 84. The insulating layer 84 can insulate the tabs 71 from the housing body 11, preventing a short circuit in the battery 100 caused by contact between the tabs 71 and the housing body 11.

[0104] Optionally, the tab 71 can be arranged between the insulating layer 84 and the pole assembly 80, which can prevent the tab 71 from shaking during subsequent use of the battery 100, resulting in contact between the tab 71 and the battery shell 10, thereby causing a short circuit in the battery 100, thereby improving the safety of the battery 100.

[0105] Optionally, the insulating layer 84 may be made of insulating tape or insulating paint.

[0106] 5-6 and 9-10 , according to some embodiments of the present application, the pole core 70 is disposed within the main housing portion 12 , the pole post assembly 80 is disposed within the thinned portion, and the pole tab 71 corresponding to the pole post assembly 80 is extended through the pole post assembly 80 . The main housing portion 12 is used to accommodate the pole core 70 , and the thinned portion 133 is used to mount the pole post assembly 80 . This allows for a rational layout of the internal space of the battery housing 10 , a compact structure, and high space utilization. This improves the energy density of the battery 100 , given a given battery size. Furthermore, this arrangement facilitates the connection of the pole post assembly 80 to the corresponding pole tab 71 .

[0107] 1-13 , an electrical device according to an embodiment of the third aspect of the present application includes: a battery according to the embodiment of the second aspect of the present application.

[0108] According to the electrical equipment of the embodiment of the present application, by providing the above-mentioned battery 100, when the electrolyte is injected into the interior of the battery shell 10 through the injection hole 34, the electrolyte can directly penetrate into the interior of the electrode core 70 through the gaps between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the infiltration efficiency of the electrolyte into the electrode core 70.

[0109] In addition, the spatial layout of the entire battery shell structure can be optimized, making the overall structure compact, which can improve the space utilization of the battery 100 to a certain extent; and, since the injection hole 34 is provided on the first step wall 50, the injection hole 34 can be closer to the pole core 70 located in the accommodating cavity 41, which can optimize the infiltration path of the electrolyte in the pole core 70, that is, the electrolyte can directly penetrate into the pole core 70 through the gap between the positive electrode sheet, the diaphragm and the negative electrode sheet, which can improve the injection efficiency to a certain extent.

[0110] Optionally, the electric device may be a vehicle, for example, a car.

[0111] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0112] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery housing (10), wherein: include: A shell body (11), the shell body (11) comprising a bottom plate (40) and side plates (20) extending along the circumference of the bottom plate (40), the side plates (20) being a plurality of side plates connected in sequence along the circumference of the bottom plate (40), and a receiving cavity (41) having an opening (110) being formed on one side of the shell body (11) along the third direction; a cover body (30), the cover body (30) being suitable for covering the opening (110), and the area of ​​the cover body (30) being larger than the area of ​​the side plate (20); The cover body (30) comprises a main body (31) and an end portion (32), wherein the end portion (32) is connected to one side of the main body (31) along a first direction, wherein the first direction intersects with the third direction, wherein the main body (31) and a portion of the shell body (11) constitute a main shell portion (12), wherein the end portion (32) and another portion of the shell body (11) constitute a thinning portion (13), wherein at least a portion of the thinning portion (13) has a dimension in the third direction that is smaller than a dimension of the main shell portion (12) in the third direction, wherein the end portion (32) comprises a step main portion (321) and a first step wall (50), wherein the step main portion (321) is ) and the first step wall (50) form a step structure, the step main part (321) includes a second step wall (51), one end of the first step wall (50) is connected to the main body (31), the other end of the first step wall (50) is connected to the second step wall (51), the first step wall (50) extends along the third direction toward the direction adjacent to the shell body (11), the first step wall (50) has an angle with the main body (31) and an angle with the second step wall (51), the first step wall (50) is formed with a liquid injection hole (34), and the second step wall (51) is formed with a pole hole (33).

2. The battery housing (10) according to claim 1, wherein: The dimension of the first step wall (50) in the third direction is W1, the maximum dimension of the injection hole (34) in the third direction is W2, W1 and W2 satisfy: 0.3W1≤W2≤0.8W1, and W1 and W2 are measured in the same unit.

3. The battery housing (10) according to claim 1 or 2, wherein: The connection between the first step wall (50) and the main body (31) is formed as a first rounded corner (53), and the radius of the first rounded corner (53) is R1, R1≥0.2mm; and / or the connection between the first step wall (50) and the second step wall (51) is formed as a second rounded corner (54), and the radius of the second rounded corner (54) is R2, R2≥0.2mm.

4. The battery housing (10) according to any one of claims 1 to 3, wherein: A matching notch (23) is formed on one side of the side plate (20) facing the cover body (30), and the end portion (32) matches with the matching notch (23).

5. The battery housing (10) according to any one of claims 1 to 4, wherein: The step main portion (321) further comprises a third step wall (52), one end of the third step wall (52) being connected to the second step wall (51), the third step wall (52) extending in the third direction toward a direction adjacent to the shell body (11), and an angle being formed between the third step wall (52) and the second step wall (51).

6. The battery housing (10) according to claim 5, wherein: In the third direction, the size of the first step wall (50) is greater than the size of the third step wall (52).

7. The battery housing (10) according to any one of claims 1 to 6, wherein: The cover body (30) and the shell body (11) are independently formed.

8. The battery housing (10) according to any one of claims 1 to 7, wherein: The end portion (32) of the cover body (30) is formed by bending.

9. The battery housing (10) according to any one of claims 1 to 8, wherein: The side plate (20) and the bottom plate (40) are independently formed.

10. The battery housing (10) according to any one of claims 1 to 9, wherein: The thickness of the side plate (20) is greater than the thickness of the cover body (30), and / or the thickness of the side plate (20) is greater than the thickness of the bottom plate (40).

11. The battery housing (10) according to any one of claims 1 to 10, wherein: The side plate (20) is arranged perpendicularly to the main body (31), and the side plate (20) is arranged perpendicularly to the bottom plate (40).

12. A battery (100), wherein: include: A pole core (70); According to the battery casing (10) according to any one of claims 1 to 11, the pole core (70) is arranged in the accommodating cavity (41), and the thickness direction of the pole core (70) is consistent with the third direction; A pole assembly is installed in the pole hole (33) and is electrically connected to the pole core (70).

13. The battery (100) according to claim 12, wherein: The pole ear (71) of the pole core (70) is located at one end of the pole core (70) adjacent to the end portion (32), and the projection of the pole ear (71) on the first step wall (50) does not overlap with the injection hole (34).

14. The battery (100) according to claim 12 or 13, wherein: The end face of the pole core (70) opposite to the first step wall (50) is a first end face (21), and the distance between the first end face (21) and the inner wall face of the first step wall (50) is H1, and H1 satisfies: 0.2mm≤H1≤3mm.

15. The battery (100) according to any one of claims 12 to 14, wherein: The surface of the main body (31) away from the shell body (11) is a first surface, and along the third direction, the pole assembly installed in the pole hole (33) does not exceed the first surface.

16. The battery (100) according to any one of claims 12 to 15, wherein: The pole assembly comprises a pole, an insulating structure and a connecting gasket, the pole is inserted into the pole hole (33), the insulating structure is located between the pole and the end (32), the connecting gasket is connected to the pole and is located in the battery housing (10), and the connecting gasket electrically connects the pole and the corresponding pole lug (71).

17. The battery (100) according to any one of claims 12 to 16, wherein: The pole lug (71) corresponding to the pole assembly is insulated and separated from the shell body (11).

18. The battery (100) according to claim 17, wherein: An insulating layer is provided between the pole lug (71) corresponding to the pole assembly and the shell body (11), and the pole lug (71) corresponding to the pole assembly abuts against the insulating layer.

19. The battery (100) according to any one of claims 12 to 18, wherein: The pole core (70) is arranged in the main shell (12), and the pole lug (71) corresponding to the pole assembly is led out through the pole assembly.

20. An electrical device, wherein: include: The battery (100) according to any one of claims 12 to 19.

Images