Single battery and preparation method thereof

Abstract

The invention discloses a single battery and a preparation method thereof, the single battery comprises a pole core, a shell and a cover body, and the single battery has a first direction; the shell comprises a shell body, the shell body comprises a first shell body and a second shell body, the first shell body and the second shell body are welded and fixed in the first direction, the first shell body and the second shell body define a containing cavity, the containing cavity is provided with a cavity opening, the pole core is arranged in the containing cavity, and the cavity opening is covered with the cover body in a sealed mode. The first shell and the second shell are directly welded and fixed in the first direction to form the shell body, meanwhile, the first shell and the second shell are enclosed to form the containing cavity, the pole core is placed in the containing cavity from the cavity opening of the containing cavity, then the cavity opening is covered with the cover body, and finally the single battery is formed. According to the shell body structure, the manufacturing process flow of the shell can be simplified, so that the production efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of single-cell battery production technology, specifically relating to a single-cell battery and its preparation method. Background Technology

[0002] With the acceleration of global energy structure transformation, lithium-ion single-cell batteries, as the core power source of new energy vehicles, have their structural design and manufacturing process directly affecting the energy density, safety performance and manufacturing cost of single-cell battery packs.

[0003] Typically, a single battery cell consists of an electrode core, a casing, and a top cover. The casing has an internal cavity where the electrode core is placed, and the top cover seals the casing. In related technologies, the casing of single batteries is mainly manufactured using a deep drawing process. This process requires multiple steps, making it complex, cumbersome, and inefficient. Summary of the Invention

[0004] This application aims to provide a single-cell battery and its preparation method, which can solve the problems of cumbersome manufacturing process and low production efficiency of single-cell battery casings in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a single-cell battery, comprising: an electrode core, a casing, and a cover, wherein the single-cell battery has a first orientation; The housing includes a housing body, which includes a first housing and a second housing. The first housing and the second housing are welded and fixed along the first direction. The first housing and the second housing enclose a receiving cavity, which has an opening. The pole core is disposed in the receiving cavity, and the cover is placed at the opening.

[0006] Optionally, the first housing and the second housing are rigid housings.

[0007] Optionally, both the first housing and the second housing are provided with grooves, and the grooves of the first housing and the second housing cooperate to form the receiving cavity.

[0008] Optionally, the first housing and the second housing are symmetrical in structure along the first direction.

[0009] Optionally, the housing further includes a flange, and the individual battery cell also has a second direction, which is perpendicular to the first direction; The shell body has two sides arranged opposite to each other along the second direction, and a bottom surface disposed away from the cavity opening. The flange portion is provided on the side surface and / or the bottom surface of the shell body, and the flange portion is connected to the shell body.

[0010] Optionally, the flanged portion includes a first flange, a first weld is formed on the bottom surface, one end of the first flange is connected to the first weld, and the other end of the first flange is folded toward the first direction to fit against a portion of the bottom surface.

[0011] Optionally, the flanged portion further includes a second flange, a second weld is formed on the side surface, one end of the second flange is connected to the second weld, and the other end of the second flange is folded toward the first direction to fit against a portion of the side surface.

[0012] Optionally, the flanged portion further includes a third flange, which is disposed on the side of the first flange away from the receiving cavity. One end of the third flange is connected to the second flange, and the other end of the third flange is folded toward the bottom surface to fit against a portion of the first flange. Alternatively, the third flange is located on the side of the second flange away from the receiving cavity, one end of the third flange is connected to the first flange, and the other end of the third flange is folded toward the side to fit against a portion of the second flange.

[0013] Optionally, the outer peripheral surface of the housing is provided with an insulating layer, which covers the housing body and / or the flange portion.

[0014] Optionally, the single cell shall satisfy at least one of the following conditions: A. The insulating layer has an opening, at least a portion of the flanged portion is exposed at the opening; B. The first flange has a first region and a second region on the side away from the shell body, the third flange is disposed in the first region, the insulating layer at least covers the second region, and the insulating layer has an opening at the position corresponding to the second region, the first flange being exposed at the opening; C. The second flange has a third region and a fourth region on the side opposite to the shell body. The third flange is disposed in the third region. The insulating layer at least covers the fourth region, and the insulating layer has an opening at the position corresponding to the fourth region, where the second flange is exposed.

[0015] Secondly, embodiments of this application propose a battery pack, including a housing and any of the aforementioned individual batteries, wherein the housing is provided with a receiving groove, and the individual battery is disposed in the receiving groove.

[0016] Optionally, the outer peripheral surface of the housing is provided with an insulating layer, the insulating layer has an opening, the opening has an adhesive layer, and the adhesive layer is connected to the box body; And / or, the housing includes a shell body and a flange, the flange being disposed on the side and / or bottom surface of the shell body, the flange at least partially protruding in a direction away from the shell body to form a protrusion; the inner wall of the housing is provided with a limiting groove, the protrusion being at least partially embedded in the limiting groove.

[0017] Thirdly, embodiments of this application propose a method for preparing a single-cell battery, used to prepare any of the single-cell batteries described above, comprising: A plate is provided, and a groove is machined in the plate to form a prefabricated shell, the prefabricated shell including a main body portion, the groove being disposed in the main body portion; The two prefabricated shells are fastened together along a first direction, wherein the main body of one prefabricated shell is designated as the first shell and the main body of the other prefabricated shell is designated as the second shell, and the first shell and the second shell are combined to form a shell body; The shell body is welded around its perimeter to form a shell with a receiving cavity; The electrode core is inserted into the receiving cavity, and the cover is placed over the opening of the receiving cavity.

[0018] Optionally, the prefabricated shell further includes an edge portion surrounding the main body; The welding of the perimeter of the shell body to form a shell with a receiving cavity includes: The two prefabricated shells are welded at the junction of the main body to form the shell body having the receiving cavity by connecting the main body of the two prefabricated shells; The edges around the main body are folded to form a flange, and the flange is made to fit against the surface of the shell body to form the shell.

[0019] In the embodiments of this application, the first shell and the second shell are directly welded and fixed along the first direction to form a shell body. At the same time, the first shell and the second shell can form a receiving cavity. The electrode core is placed in the receiving cavity from the cavity opening, and then the cover is sealed at the cavity opening to finally form a single cell. This shell body structure can simplify the shell manufacturing process and thus improve production efficiency.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is an isometric view of the welded structure of a single cell according to an embodiment of this application; Figure 2 This is one of the structural schematic diagrams of the housing according to an embodiment of this application; Figure 3 This is an exploded view of a single cell according to an embodiment of this application; Figure 4 This is a second schematic diagram of the shell structure according to an embodiment of this application; Figure 5 This is one of the front views of a first type of single-cell battery according to an embodiment of this application; Figure 6 This is one of the isometric views of a first type of single-cell battery according to an embodiment of this application; Figure 7 This is one of the front views of the flange structure of the first type of single cell according to an embodiment of this application; Figure 8 This is one of the isometric views of the flange structure of the first type of single cell according to the embodiments of this application; Figure 9 This is a second front view of the flange structure of the first type of single cell according to the embodiments of this application; Figure 10 This is the second isometric view of the flange structure of the first type of single cell according to the embodiments of this application; Figure 11 This is a third front view of the first type of single-cell battery according to an embodiment of this application; Figure 12 This is one of the isometric views of a second type of single-cell battery according to an embodiment of this application; Figure 13 This is one of the front views of a second type of single-cell battery according to an embodiment of this application; Figure 14 This is the second isometric view of the second type of single cell according to the embodiments of this application; Figure 15 This is a second front view of a second type of single-cell battery according to an embodiment of this application; Figure 16 This is the third isometric view of the second type of single cell according to the embodiments of this application; Figure 17 This is a third front view of the second type of single-cell battery according to an embodiment of this application; Figure 18 This is the fourth front view of the second type of single-cell battery according to an embodiment of this application; Figure 19 This is one of the isometric views of a third type of single-cell battery according to an embodiment of this application; Figure 20 This is one of the front views of a third type of single-cell battery according to an embodiment of this application; Figure 21 This is the second isometric view of the third type of single cell according to the embodiments of this application; Figure 22 This is a second front view of a third type of single-cell battery according to an embodiment of this application; Figure 23 This is a cross-sectional view of a third type of single-cell battery according to an embodiment of this application; Figure 24 This is a cross-sectional view of a second type of single-cell battery according to an embodiment of this application; Figure 25 This is a schematic diagram of the plate structure according to an embodiment of this application; Figure 26 This is a schematic diagram of the structure of the prefabricated shell according to an embodiment of this application; Figure 27 This is a flowchart of a method for preparing a single-cell battery according to an embodiment of this application; Figure 28 yes Figure 27 The flowchart for step 12.

[0022] Figure label: 10: Core; 20: Shell; 21: First shell; 22: Second shell; 201: Shell body; 202: Receiving cavity; 203: Groove; 23: Flanged part; 231: First flange; 2311: First region; 2312: Second region; 232: Second flange; 2321: Third region; 2322: Fourth region; 233: Third flange; 24: Bottom surface; 25: First weld; 26: Insulating layer; 261: Opening; 27: Second weld; 29: Side; 30: Cover; 40: Plate; 41: Prefabricated shell; 411: Main body; 412: Edge; 413: First tangent; 414: Second tangent; X: First direction; Y: Second direction; Z: Third direction. Detailed Implementation

[0023] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] The following detailed description, in conjunction with the accompanying drawings, of the single-cell battery and its preparation method provided in this application through specific embodiments and application scenarios, will be provided in detail.

[0028] A typical battery consists of an aluminum casing, electrode cores, and a top cover. The aluminum casing contains a cavity. The top cover is first connected to the electrode core and then placed inside the cavity. Finally, the top cover is sealed at the opening of the cavity, thus forming the battery cell. Generally, the aluminum casing is manufactured using a stretching process, requiring multiple stamping or rolling processes to process the sheet aluminum into a casing with a cavity. This manufacturing process requires many stamping dies of different sizes, resulting in a cumbersome process and low production efficiency.

[0029] like Figures 1 to 3As shown, a single-cell battery according to some embodiments of this application includes: an electrode core 10, a housing 20, and a cover 30. The single-cell battery has a first direction. The housing 20 includes a housing body 201, which includes a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are welded and fixed along the first direction. The first housing 21 and the second housing 22 enclose a receiving cavity 202. The receiving cavity 202 has an opening. The electrode core 10 is disposed in the receiving cavity 202, and the cover 30 is sealed at the opening.

[0030] In the embodiments of this application, the first housing 21 and the second housing 22 are directly welded and fixed along the first direction to form the housing body 201. At the same time, the first housing 21 and the second housing 22 can form a receiving cavity 202. The electrode core 10 is placed in the receiving cavity 202 from the cavity opening, and then the cover 30 is sealed at the cavity opening to finally form a single battery cell. This housing body 201 structure can simplify the manufacturing process of the housing 20, thereby improving production efficiency.

[0031] In some embodiments, the first housing 21 and the second housing 22 are rigid housings.

[0032] In this embodiment of the application, by setting the first housing 21 and the second housing 22 as rigid housings, the strength of the housing body 201 can be improved. When the single cell is subjected to external force, the rigid housing can protect the electrode core 10 in the receiving cavity 202, reduce the damage of external force to the electrode core 10, and thus improve the service life and safety of the single cell.

[0033] For example, the material of the rigid shell can be metals such as aluminum and stainless steel, or other materials with high strength and stability. The specific material of the rigid shell can be flexibly selected according to actual process requirements, and the embodiments of this application do not limit it.

[0034] In some embodiments, the first housing 21 is provided with a groove 203, the groove 203 having a first slot along a first direction X and a second slot along a third direction Z, the second housing 22 covering the first slot and connected to the first housing 21, the groove 203 in the first housing 21 and the second housing 22 cooperate to form a receiving cavity 202, and the second slot is the cavity opening of the receiving cavity 202.

[0035] In this embodiment, by providing a groove 203 in the first housing 21, the second housing 22 is directly sealed over the first slot and connected to the first housing 21. The groove 203 in the first housing 21 cooperates with the second housing 22 to form a receiving cavity 202. This reduces the time required to process the groove 203 in the second housing 22, thereby improving production efficiency.

[0036] In some embodiments, the second housing 22 is provided with a groove 203, the groove 203 having a first slot along a first direction X and a second slot along a third direction Z, the first housing 21 is covered by the first slot and connected to the second housing 22, the groove 203 in the second housing 22 cooperates with the first housing 21 to form a receiving cavity 202, and the second slot is the cavity opening of the receiving cavity 202.

[0037] In this embodiment, by providing a groove 203 in the second housing 22, the first housing 21 is directly sealed over the first slot and connected to the second housing 22. The groove 203 in the second housing 22 cooperates with the first housing 21 to form a receiving cavity 202. This reduces the time required to process the groove 203 in the first housing 21, thereby improving production efficiency.

[0038] like Figure 3 and Figure 4 As shown, in some embodiments, both the first housing 21 and the second housing 22 are provided with grooves 203, and the grooves 203 of the first housing 21 and the second housing 22 cooperate to form a receiving cavity 202.

[0039] In this embodiment of the application, by providing grooves 203 in both the first housing 21 and the second housing 22, the grooves 203 in the first housing 21 and the grooves 203 in the second housing 22 cooperate to form a receiving cavity 202, which facilitates the assembly of the housing body 201.

[0040] like Figure 3 As shown, in some embodiments, the first housing 21 and the second housing 22 are symmetrically arranged along the first direction X.

[0041] In this embodiment, by setting the first housing 21 and the second housing 22 as a symmetrical structure along the first direction X, not only can the uniformity of force distribution on the housing body 201 under external force be improved, but the aesthetics of the housing body 201 can also be enhanced. Furthermore, this symmetrical structural design eliminates the need for operators to spend extra time identifying the welding direction of the first housing 21 and the second housing 22, facilitating operation and thereby improving the production efficiency of individual cells.

[0042] like Figure 4 As shown, in some embodiments, the housing 20 further includes a flange 23, and the single cell also has a second direction Y, which is perpendicular to the first direction X; the housing body 201 has two side surfaces 29 arranged opposite to each other along the second direction Y, and a bottom surface arranged away from the cavity opening, the flange 23 is provided on the side surface of the housing body 201, and the flange 23 is connected to the housing body 201.

[0043] In this embodiment of the application, by providing flanged portions 23 on two side surfaces 29 of the shell body 201 that are arranged opposite to each other along the second direction Y, the flanged portions 23 are made to fit against the side surfaces 29 of the shell body 201, thereby increasing the thickness of the two side surfaces 29 of the shell body 201 and thus improving the structural strength of the two side surfaces 29 on the shell body 201.

[0044] like Figure 4 As shown, in some embodiments, the housing 20 further includes a flange 23, and the single cell also has a second direction Y, which is perpendicular to the first direction X; the housing body 201 has two side surfaces 29 arranged opposite to each other along the second direction Y, and a bottom surface 24 disposed away from the cavity opening, the flange 23 is disposed on the bottom surface 24 of the housing body 201, and the flange 23 is connected to the housing body 201.

[0045] In this embodiment of the application, by providing a flange 23 on the bottom surface 24 of the shell body 201, the flange 23 is made to fit against the bottom surface 24 of the shell body 201, thereby increasing the thickness of the bottom surface 24 of the shell body 201 and thus improving the structural strength of the bottom surface 24 of the shell body 201.

[0046] like Figure 4 As shown, the housing 20 further includes a flange 23, and the single cell also has a second direction Y, which is perpendicular to the first direction X; the housing body 201 has two side surfaces 29 arranged opposite to each other along the second direction Y, and a bottom surface 24 disposed away from the cavity opening, the flange 23 is provided on the side surfaces 29 and the bottom surface 24 of the housing body 201, and the flange 23 is connected to the housing body 201.

[0047] In this embodiment of the application, by providing flanged portions 23 on the bottom surface 24 and the two side surfaces 29 of the shell body 201, the flanged portions 23 are made to fit the bottom surface 24 and the side surfaces 29 of the shell body 201, which can simultaneously increase the thickness of the bottom surface 24 and the two side surfaces 29 of the shell body 201, thereby improving the structural strength of the side surfaces 29 and the bottom surface 24 of the shell body 201.

[0048] like Figure 5 As shown, in some embodiments, the flange portion 23 includes a first flange 231, a first weld 25 is formed on the bottom surface 24, one end of the first flange 231 is connected to the first weld 25, and the other end of the first flange 231 is folded toward the first direction X to fit against a portion of the bottom surface 24.

[0049] In this embodiment of the application, by setting a first flange 231, one end of the first flange 231 is connected to the first weld 25 formed by the bottom surface 24, and the other end is folded towards the first direction X and attached to part of the bottom surface 24. This not only improves the strength of the bottom surface 24 by using the first flange 231, but also makes up for the height difference between the first weld 25 and the bottom surface 24 by using the first flange 231, so that the surface of the shell body 201 is flatter.

[0050] like Figure 5 As shown, in some embodiments, the flange portion 23 further includes a second flange 232, a second weld 27 is formed on the side surface 29, one end of the second flange 232 is connected to the second weld 27, and the other end of the second flange 232 is folded toward the first direction X to fit against a portion of the side surface 29.

[0051] In this embodiment of the application, by setting a second flange 232, one end of the second flange 232 is connected to the second weld 27 formed by the side surface 29, and the other end is folded towards the first direction X and attached to part of the side surface 29. This not only improves the strength of the side surface 29 by using the second flange 232, but also makes up for the height difference between the second weld 27 and the side surface 29 by using the second flange 232, so that the surface of the shell body 201 is flatter.

[0052] like Figure 10 and Figure 11 As shown, in some embodiments, the flange portion 23 further includes a third flange 233, which is disposed on the side of the first flange 231 away from the receiving cavity 202. One end of the third flange 233 is connected to the second flange 232, and the other end of the third flange 233 is folded toward the bottom surface 24 to fit against a portion of the first flange 231.

[0053] In this embodiment, a third flange 233 is provided on the side of the first flange 231 away from the receiving cavity 202, so that one end of the third flange 233 is connected to the second flange 232, and the other end of the third flange 233 is folded towards the bottom surface 24 and fits against part of the first flange 231. In this way, the third flange 233 can be used to enhance the structural strength at the junction of the first flange 231 and the second flange 232, thereby further improving the strength of the shell body 201.

[0054] like Figure 18 As shown, the third flange 233 is located on the side of the second flange 232 away from the receiving cavity 202. One end of the third flange 233 is connected to the first flange 231, and the other end of the third flange 233 is folded toward the side 29 to fit against part of the second flange 232.

[0055] In this embodiment, a third flange 233 is provided on the side of the second flange 232 away from the receiving cavity 202, so that one end of the third flange 233 is connected to the first flange 231, and the other end of the third flange 233 is folded towards the side 29 and fits against part of the second flange 232. In this way, the third flange 233 can be used to enhance the structural strength at the junction of the first flange 231 and the second flange 232, thereby further improving the strength of the shell body 201.

[0056] like Figure 23 and Figure 24 As shown, in some embodiments, the outer peripheral surface of the housing 20 is provided with an insulating layer 26, which covers the housing body 201.

[0057] In this embodiment, by providing an insulating layer 26 on the outer peripheral surface of the housing 20, the insulating layer 26 covers the housing body 201. This can improve the insulation performance of the housing 20, prevent the individual battery from causing harm to the user's safety due to leakage, and thus improve the safety of the individual battery.

[0058] like Figure 23 and Figure 24 As shown, in some embodiments, the outer peripheral surface of the housing 20 is provided with an insulating layer 26, which covers the flange portion 23.

[0059] In this embodiment, by providing an insulating layer 26 on the outer peripheral surface of the housing 20, the insulating layer 26 covers the flange portion 23. This allows the insulating layer 26 to provide insulation protection for the outer surface of the housing body 201, and also improves the insulation performance of the housing 20, thereby enhancing the safety of the single battery cell.

[0060] like Figure 23 and Figure 24 As shown, in some embodiments, the outer peripheral surface of the housing 20 is provided with an insulating layer 26, which covers the housing body 201 and the flange portion 23.

[0061] In this embodiment, by providing an insulating layer 26 on the outer peripheral surface of the housing 20, the insulating layer 26 covers both the housing body 201 and the flange portion 23. This allows the insulating layer 26 to provide insulation protection for the outer surface of the housing body 201 and also improves the insulation performance of the housing 20, thereby enhancing the safety of the single battery cell.

[0062] It should be noted that the material of the insulating layer 26 can be polyethylene, polypropylene or polyimide, etc. Of course, the specific type of the insulating layer 26 can be flexibly set according to actual needs, and this application embodiment does not limit it.

[0063] It should also be noted that the insulating layer 26 can be applied to the outer peripheral surface of the housing 20 by means of spraying or heat shrinking. The specific application method can be flexibly selected according to actual needs, and this application embodiment does not limit it. For example, in such Figure 11 In the single-cell battery structure shown, the thickness of the insulating layer 26 in the area where the third flange 233 is not provided on the first flange 231 can be increased to keep the outer surface of the casing 20 flat along the third direction Z, thereby improving the structural stability of the single-cell battery; in such a way... Figure 18 In the single-cell battery structure shown, the thickness of the insulating layer 26 in the area where the third flange 233 is not provided on the second flange 232 can be increased to keep the outer surface of the casing 20 flat along the second direction Y, thereby improving the structural stability of the single-cell battery.

[0064] like Figure 24 As shown, in some embodiments, the insulating layer 26 has an opening 261, at which at least a portion of the flange 23 is exposed.

[0065] In this embodiment of the application, by providing an opening 261 in the insulating layer 26, at least part of the flange 23 is exposed at the opening 261, which is beneficial to the heat dissipation of the shell body 201, thereby improving the stability of the single cell operation.

[0066] like Figure 24 As shown, in some embodiments, the first flange 231 has a first region 2311 and a second region 2312 on the side opposite to the shell body 201, the third flange 233 is disposed in the first region 2311, the insulating layer 26 at least covers the second region 2312, and the insulating layer 26 has an opening 261 at the position corresponding to the second region 2312, where the first flange 231 is exposed.

[0067] In this embodiment of the application, by setting a first region 2311 and a second region 2312 on the side of the first flange 231 away from the shell body 201, and setting a third flange 233 in the first region 2311, the insulating layer 26 at least covers the second region 2312. In this way, the insulating layer 26 can compensate for the height difference between the third flange 233 and the bottom surface 24 due to the setting of the third flange 233 on the bottom surface 24.

[0068] like Figure 23 As shown, in some embodiments, the second flange 232 has a third region 2321 and a fourth region 2322 on the side opposite to the shell body 201, the third flange 233 is disposed in the third region 2321, the insulating layer 26 at least covers the fourth region 2322, and the insulating layer 26 has an opening 261 at the position corresponding to the fourth region 2322, where the second flange 232 is exposed.

[0069] In this embodiment of the application, by providing a third region 2321 and a fourth region 2322 on the side of the second flange 232 away from the shell body 201, and by setting the third flange 233 in the third region 2321, the insulating layer 26 at least covers the fourth region 2322. In this way, the insulating layer 26 can be used to compensate for the height difference between the third flange 233 and the side 29 caused by the third flange 233 being provided on the side 29.

[0070] In some embodiments, this application also proposes a battery pack, including a housing and individual batteries as described in the above embodiments, wherein the housing has a receiving groove and the individual batteries are disposed in the receiving groove.

[0071] In this embodiment of the application, the first housing 21 and the second housing 22 in the single cell are directly welded and fixed along the first direction X to form the housing body 201. At the same time, the first housing 21 and the second housing 22 can form a receiving cavity 202. The electrode core 10 is placed in the receiving cavity 202 from the cavity opening, and then the cover is sealed at the cavity opening to finally form a single cell. This structure can simplify the manufacturing process of the housing 20, thereby improving production efficiency.

[0072] In some embodiments, the outer peripheral surface of the housing 20 is provided with an insulating layer 26, an opening 261 is provided in the insulating layer 26, an adhesive layer is provided in the opening 261, and the adhesive layer is connected to the housing.

[0073] In this embodiment, by providing an adhesive layer within the opening 261 of the insulating layer 26, the individual battery cells are bonded and fixed to the casing. This improves the installation stability of the individual battery cells within the casing and prevents them from shaking within the receiving slot. Simultaneously, placing the adhesive layer within the opening 261 of the insulating layer reduces the space required for a separate adhesive layer, thereby contributing to increased energy density of the battery pack.

[0074] It should be noted that the adhesive layer can be made of epoxy resin, polyurethane adhesive, or other adhesives. Of course, the specific type of adhesive layer can be flexibly selected according to actual needs, and the embodiments of this application do not limit it.

[0075] In some embodiments, the housing 20 includes a housing body 201 and a flange 23. The flange 23 is disposed on the side surface 29 and / or bottom surface 24 of the housing body 201. The flange 23 protrudes at least partially in a direction away from the housing body 201 to form a protrusion. The inner wall of the housing is provided with a limiting groove, and the protrusion is at least partially embedded in the limiting groove.

[0076] In this embodiment, by making the flange 23 protrude away from the shell body 201, the flange 23 forms a protrusion. Simultaneously, a limiting groove is provided inside the casing, allowing the protrusion to be at least partially embedded within the limiting groove. Thus, when the shell 20 is fixed inside the casing, the position of the shell 20 can be limited by the cooperation of the limiting groove and the protrusion, preventing the shell 20 from moving within the casing. This improves the installation stability of the individual battery cells within the casing. Furthermore, utilizing the cooperative structure of the limiting groove and the protrusion, when installing the individual battery cells into the casing, the operator only needs to align the protrusion with the limiting groove and then push the individual battery cells into the casing. This simplifies the installation steps for individual battery cells, thereby improving the assembly efficiency of individual battery cells.

[0077] This application provides a method for preparing a single-cell battery, used to prepare the single-cell battery described in the above embodiments, such as... Figure 27 As shown, the preparation method includes the following steps: Step 10: Provide a plate 40 and process a groove 203 in the plate 40 to form a prefabricated shell 41. The prefabricated shell 41 includes a main body 411 and the groove 203 is provided in the main body 411.

[0078] Specifically, such as Figure 25 and Figure 26 As shown, two plates 40 are prepared, and grooves 203 are machined in the two plates 40 using a stamping or rolling equipment to form two prefabricated shells 41 respectively. One prefabricated shell 41 serves as the first shell 21, and the other prefabricated shell 41 serves as the second shell 22.

[0079] Step 11: Fasten the two prefabricated shells 41 together along the first direction X. The main body 411 of one prefabricated shell 41 is designated as the first shell 21, and the main body 411 of the other prefabricated shell 41 is designated as the second shell 22. The shell body 201 is formed by the cooperation of the first shell 21 and the second shell 22.

[0080] Specifically, the two prefabricated housings 41 are fastened together along the first direction X, and the grooves 203 in the first housing 21 and the second housing 22 cooperate to form a receiving cavity 202. During the fastening process, it is necessary to ensure that the grooves 203 of the first housing 21 and the second housing 22 are aligned to form a complete receiving cavity 202, which facilitates the subsequent placement of the electrode core 10 and the sealing operation of the cover 30.

[0081] Step 12: Weld the perimeter of the shell body 201 to form a shell 20 with a receiving cavity 202.

[0082] Specifically, welding equipment is used to weld and fix the junction of the first shell 21 and the second shell 22, connecting the first shell 21 and the second shell 22 into a whole, thereby forming a complete shell body 201. It is important to note that during the welding process, the strength and sealing of the weld joint must be ensured to prevent electrolyte leakage within the receiving cavity 202 and ensure the normal operation of the single cell. At the same time, deformation of the first shell 21 and the second shell 22 should be avoided as much as possible during the welding operation to maintain the flatness and dimensional accuracy of the formed shell body 201, meeting the assembly requirements of the single cell.

[0083] Step 13: Insert the electrode core 10 into the receiving cavity 202 and cover the opening of the receiving cavity 202 with the cover 30.

[0084] Specifically, the electrode core 10 is inserted into the cavity 202 from the cavity opening, and then the cover 30 is placed on the cavity opening to seal the cavity 202 and prevent external impurities from contaminating and damaging the electrode core 10.

[0085] In some embodiments, the prefabricated housing 41 further includes an edge portion 412 disposed around the main body portion 411; such as Figure 28 As shown, step 12 involves welding around the perimeter of the shell body 201 to form a shell 20 with a receiving cavity 202, specifically including the following steps: Step 121: Weld the two prefabricated shells 41 at the junction of the main body 411 to form a shell body 201 with a receiving cavity 202 by connecting the main body 411 of the two prefabricated shells 41.

[0086] Specifically, when the two prefabricated shells 41 are fastened together along the first direction X, the two prefabricated shells 41 are welded together along the circumference of the two prefabricated shells 41 so that the grooves 203 in the main body 411 of the two prefabricated shells 41 surround and form a receiving cavity 202.

[0087] Step 122: Fold the edges around the main body 411 to form a flange 23, and fit the flange 23 with the surface of the shell body 201 to form the shell 20.

[0088] Specifically, such as Figures 12 to 18As shown, a first tangent line 413 can be provided on the edge portion 412 of the two prefabricated shells 41, and the first tangent line 413 extends along the second direction Y. The edge portion 412 is cut along the first tangent line 413 by a cutting device to form a first cut, so that the edge portion 412 is divided into a first edge portion and a second edge portion. The first edge portion is located on both sides of the main body portion 411 along the second direction Y, and the first edge portion is folded so that the first edge portion can fit with the side surface 29 of the shell body 201 along the second direction Y, thereby forming a second flange 232. The second edge portion includes two sub-second edge portions. The two sub-second edge portions are folded in opposite directions along the X direction so that one sub-second edge portion can fit with the bottom surface 24 of the shell body 201, thereby forming a first flange 231, and the other sub-second edge portion can fit with the first edge portion, thereby forming a third flange 233. like Figures 5 to 11 As shown, a second tangent 414 can also be provided on the edge portion 412 of the two prefabricated shells 41, and the second tangent 414 extends along the third direction Z. The edge portion 412 is cut along the second tangent 414 using a cutting device to form a second cut, so that the edge portion 412 is divided into a first edge portion and a second edge portion. The first edge portion includes two sub-first edge portions, one of which is located on both sides of the main body portion 411 along the second direction Y, and the sub-first edge portion is folded so that the sub-first edge portion can fit with the side surface 29 of the shell body 201 along the second direction Y, thereby forming a second flange 232. The other sub-first edge portion can fit with the second edge portion, thereby forming a third flange 233. The second edge portion can fit with the bottom surface 24 of the shell body 201, thereby forming a first flange 231.

[0089] like Figures 19 to 22 As shown, a first tangent 413 and a second tangent can also be provided on the edge portion 412. The first tangent 413 extends along the second direction Y, and the second tangent 414 extends along the third direction Z. The edge portion 412 is cut along the first tangent 413 and the second tangent 414 using a cutting device to form a first cut and a second cut, respectively. This removes part of the edge portion 412 at the corner of the shell body 201, so that the main body portion 411 has a first edge portion on both sides along the second direction Y and a second edge portion on one side along the Z direction. The first edge portion is folded over so that it can fit with the side surface 29 of the shell body 201 along the second direction Y, thereby forming a second flange 232. The second edge portion is folded over so that it can fit with the bottom surface 24 of the shell body 201, thereby forming a first flange 231. This arrangement can improve the flatness of the shell body 201.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A single cell characterized by, Comprise: a pole core (10), a shell (20) and a cover (30), the single battery has a first direction (X); The shell (20) comprises a shell body (201), the shell body (201) comprises a first shell (21) and a second shell (22), the first shell (21) and the second shell (22) are fixedly welded along the first direction (X), the first shell (21) and the second shell (22) are enclosed to form a containing cavity (202), the containing cavity (202) has a cavity opening, the pole core (10) is arranged in the containing cavity (202), and the cover (30) is covered at the cavity opening.

2. The cell according to claim 1, wherein The first shell (21) and the second shell (22) are rigid shells.

3. The cell according to claim 1, wherein The first shell (21) and the second shell (22) are provided with grooves (203), and the grooves (203) of the first shell (21) and the second shell (22) cooperate to form the containing cavity (202).

4. The cell according to claim 1, wherein The first shell (21) and the second shell (22) are symmetrical along the first direction (X).

5. The single cell according to any one of claims 1 to 4, wherein The shell (20) further comprises a flanging portion (23), and the single battery further has a second direction (Y) perpendicular to the first direction (X); The shell body (201) has two side faces (29) oppositely arranged along the second direction (Y) and a bottom face (24) arranged away from the cavity opening, the flanging portion (23) is arranged on the side face (29) and / or the bottom face (24) of the shell body (201), and the flanging portion (23) is connected with the shell body (201).

6. The cell according to claim 5, wherein The flanging portion (23) comprises a first flange (231), a first welding seam (25) is formed on the bottom face (24), one end of the first flange (231) is connected with the first welding seam (25), and the other end of the first flange (231) is folded towards the first direction (X) to be attached to part of the bottom face (24).

7. The cell according to claim 6, wherein The flanging portion (23) further comprises a second flange (232), a second welding seam (27) is formed on the side face (29), one end of the second flange (232) is connected with the second welding seam (27), and the other end of the second flange (232) is folded towards the first direction (X) to be attached to part of the side face (29).

8. The cell according to claim 7, wherein The flanging portion (23) further comprises a third flange (233), the third flange (233) is arranged on a side of the first flange (231) away from the containing cavity (202), one end of the third flange (233) is connected with the second flange (232), and the other end of the third flange (233) is folded towards the bottom face (24) to be attached to part of the first flange (231); Or, the third flange (233) is arranged on the side of the second flange (232) away from the accommodating cavity (202), one end of the third flange (233) is connected with the first flange (231), and the other end of the third flange (233) is folded towards the side surface (29) to be attached to part of the second flange (232).

9. The cell according to claim 8, wherein The outer peripheral surface of the shell (20) is provided with an insulating layer (26), and the insulating layer (26) covers the shell body (201) and / or the flange portion (23).

10. The cell according to claim 9, wherein The single battery at least meets one of the following conditions: A. The insulating layer (26) is provided with an opening (261), and at least part of the flange portion (23) is exposed at the opening (261); B. The first flange (231) has a first area (2311) and a second area (2312) on the side away from the shell body (201), the third flange (233) is arranged on the first area (2311), the insulating layer (26) at least covers the second area (2312), and the insulating layer (26) is provided with an opening (261) at a position corresponding to the second area (2312), and the first flange (231) is exposed at the opening (261); C. The second flange (232) has a third area (2321) and a fourth area (2322) on the side away from the shell body (201), the third flange (233) is arranged on the third area (2321), the insulating layer (26) at least covers the fourth area (2322), and the insulating layer (26) is provided with an opening (261) at a position corresponding to the fourth area (2322), and the second flange (232) is exposed at the opening (261).

11. A battery pack, characterized by The box body is provided with a receiving groove, and the protruding portion is at least partially embedded in the receiving groove.

12. The cell according to claim 11, wherein The outer peripheral surface of the shell (20) is provided with an insulating layer (26), and the insulating layer (26) is provided with an opening (261), and the opening (261) is provided with an adhesive layer, and the adhesive layer is connected with the box body. And / or, the shell (20) comprises a shell body (201) and a flange portion (23), the flange portion (23) is arranged on the side surface (29) and / or the bottom surface (24) of the shell body (201), and the flange portion (23) at least partially protrudes away from the shell body (201) to form a protruding portion; the inner wall of the box body is provided with a limiting groove, and the protruding portion is at least partially embedded in the limiting groove.

13. A method for producing a unit cell for producing a unit cell according to any one of claims 1 to 10, characterized in that The method comprises the following steps: A plate body (40) is provided, and a recess (203) is processed in the plate body (40) to form a prefabricated shell (41), and the prefabricated shell (41) comprises a main body portion (411), and the recess (203) is arranged in the main body portion (411); Two of the prefabricated shells (41) are buckled along a first direction (X), wherein the main body part (411) of one of the prefabricated shells (41) is set as a first shell (21), and the main body part (411) of the other of the prefabricated shells (41) is set as a second shell (22), and the first shell (21) and the second shell (22) cooperate to form a shell body (201); The periphery of the shell body (201) is welded to form a shell (20) with a containing cavity (202); A pole core (10) is loaded into the containing cavity (202), and a cover (30) is covered on the cavity opening of the containing cavity (202).

14. The method of manufacturing a unit cell according to claim 13, wherein The prefabricated shell (41) further comprises an edge part (412) arranged around the periphery of the main body part (411); The welding of the periphery of the shell body (201) to form the shell (20) with the containing cavity (202) comprises: The main body parts (411) of the two prefabricated shells (41) are welded at the joint to connect the main body parts (411) of the two prefabricated shells (41) to form the shell body (201) with the containing cavity (202); The edge part (412) around the periphery of the main body part (411) is folded to form a folded edge part (23), and the folded edge part (23) is attached to the surface of the shell body (201) to form the shell (20).

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