Single battery shell component and single battery

Abstract

The invention belongs to the field of batteries, and particularly relates to a single battery shell component and a single battery. The technical problems of high material selection difficulty, low unpacking efficiency and high operation difficulty in the unpacking process of an existing single battery with a sealing assembly are solved. A magnetic component is arranged on the first area of the shell component, and when the magnetic component is attracted by the magnetic attraction device, an opening penetrating through an inner cavity of the shell is formed in the shell. The magnetic component is fixed on the single battery to serve as an unpacking piece, the shell is torn by the magnetic component under the attraction of the external magnetic attraction device, the opening penetrating through the inner cavity of the shell is formed in the shell, and the inner cavity of the single battery is ensured to be communicated with the shared cavity through the opening. And the unpacking process is convenient and fast, operation is easy, implementation is easy, and the unpacking efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the field of batteries, and in particular relates to a single cell shell component and a single cell. Background Art

[0002] Currently, many batteries on the market are connected in parallel or in series to form large-capacity batteries (also known as battery modules or battery packs).

[0003] However, existing large-capacity batteries have inherent differences among individual cells. Due to the "barrel effect," the performance of the worst cell is often affected, significantly limiting the upper capacity and cycle life of the entire large-capacity battery. Therefore, improving the uniformity of individual cells in large-capacity batteries has become a key and challenging area of ​​research in this field.

[0004] In order to solve the above problems, Chinese patent CN220324596U discloses a large-capacity battery, the structure of which is as follows: Figure 1 As shown, this type of high-capacity battery includes a housing 01 and multiple single cells 1, which are connected in parallel and arranged in the inner cavity of the housing 01. The housing 01 is provided with a shared chamber (here, the shared chamber is an electrolyte shared chamber 02 and / or a gas shared chamber 03), which is connected to the inner cavities of each single cell. The electrolyte and / or gas in the inner cavities of each single cell are connected through the electrolyte shared chamber and / or gas shared chamber, so that the electrolyte and / or gas of all single cells are in the same system, reducing the differences between the single cells and improving the consistency between the single cells to a certain extent, thereby improving the cycle life of the high-capacity battery to a certain extent.

[0005] Typically, the shared chamber can be connected to the internal cavities of all the cells by opening the sealing assembly at the opening of the cell housing. Specifically, the sealing assembly can be opened by external force or by the electrolyte itself. The sealing assembly can be made of the sealing films disclosed in Chinese patents CN218525645U and CN218525614U. One type of sealing film is soluble in electrolyte; another type can be opened by external force.

[0006] However, the above two types of sealing films may have the following problems during actual use:

[0007] 1. Use a sealing film that dissolves in electrolyte. Generally, a protective film that is insoluble in electrolyte needs to be placed on the side of the sealing film facing the inside of the single cell housing. When the sealing film dissolves in the electrolyte, the protective film will fall off. The use of this type of sealing film is firstly difficult to select the material. Such material must have a certain compressive strength to ensure the sealing of the single cell opening before unpacking, and must also dissolve in the electrolyte to ensure smooth unpacking. Secondly, if the dissolution rate of the sealing film in the electrolyte is too slow, the assembly process of the entire large-capacity battery will be prolonged.

[0008] 2. Use a sealing membrane that can be opened by external force. Typically, a pulling ring is provided on the sealing membrane. Pulling the pulling ring with external force creates an opening in the sealing membrane. This type of sealing membrane requires a pulling tool to be inserted into a shared chamber and connected to each pulling ring before the package can be opened. This requires a certain pulling tool and pulling angle, making the operation more difficult. Summary of the Invention

[0009] The purpose of the present invention is to provide a single cell shell component and a single cell, which overcomes the technical problems of the existing single cell with a sealing assembly, such as difficulty in material selection, low unpacking efficiency and difficulty in operation during the unpacking process.

[0010] The technical solution of the present invention is to provide a single battery shell component, which is special in that a magnetic component is provided on the first area of ​​the shell component, and when the magnetic component is attracted by the magnetic attraction device, an opening penetrating the shell cavity is formed on the shell component.

[0011] It should be noted that the single cell housing member described herein may be a single cell housing, or may be a partial structure of a single cell housing, such as at least one of a single cell upper cover plate, a single cell lower cover plate or a single cell cylinder.

[0012] When the single cell housing component is the single cell lower cover, the shared chamber in the large-capacity battery is an electrolyte shared chamber; each single cell is connected to the electrolyte shared chamber through an opening on the lower cover.

[0013] When the single cell shell member is the single cell upper cover, the shared chamber in the large-capacity battery is a gas shared chamber; each single cell is connected to the gas shared chamber through an opening on the upper cover.

[0014] When the single cell housing member is a single cell cylinder, the shared chamber in the large-capacity battery is a gas-liquid shared chamber; each single cell is connected to the gas-liquid shared chamber through an opening on the side wall.

[0015] The present invention fixes a magnetic component as an opening piece on the single battery shell component. Under the attraction of an external magnetic device, the magnetic component tears the shell, forming an opening on the shell component that penetrates the shell cavity. The opening ensures that the single battery cavity and the shared cavity are connected.

[0016] Compared with the method of opening the package using a sealing film that can be dissolved in electrolyte, firstly, the opening piece of the present invention only needs to use a magnetic component (including magnetic metal or magnet and other magnetic materials), and the external opening device can use a conventional magnetic attraction device (with the property of attracting the above-mentioned magnetic component), and the material selection is not difficult; secondly, the present invention can complete the unpacking of all single batteries at one time through magnetic attraction, the unpacking process is convenient, and the unpacking efficiency is high.

[0017] Compared with the method of using a pulling tool to open the package, the magnetic suction device of the present invention does not need to be in direct contact with the magnetic component and can be directly placed outside the shared chamber for operation. The operation is simple and easy to implement.

[0018] Furthermore, to facilitate the formation of an opening in the housing, the present invention provides a weakened region on the first region of the housing member; a magnetic member is fixed to the weakened region; and when the magnetic member is attracted by the magnetic attraction device, at least a portion of the weakened region separates from the housing along with the magnetic member, forming the aforementioned opening. The weakened region herein can be understood as an area that is more easily opened to form an opening than other areas of the housing; after the weakened region is provided, the magnetic member is directly fixed to the weakened region, and under the action of the magnetic attraction device, the magnetic member more easily drives the weakened region to separate from the housing, thereby forming the aforementioned opening.

[0019] Furthermore, the present invention can form the following two types of weak areas on the first area of ​​the shell component:

[0020] The first type of weak area is a first annular groove formed around the first region of the housing component, with the area enclosed by the first annular groove serving as the weak area. Under the action of the magnetic attraction device, the magnetic member more easily pulls at least part of the weak area away from the housing through the first annular groove, forming the aforementioned opening. This effect is particularly effective when the first annular groove has a V-shaped cross-section.

[0021] The second type of weak areas:

[0022] A first through hole is opened on a first area of ​​the housing component and passes through the inner cavity of the housing, and the first through hole is sealed with a sealing member; the first through hole portion with the sealing member is used as a weak area;

[0023] The magnetic component is fixed on the sealing component; when the magnetic component is attracted by the magnetic attraction device, at least part of the sealing component is separated from the shell along with the magnetic component, forming the opening.

[0024] The phrase “at least part of the sealing member is separated from the housing along with the magnetic member to form the opening” mentioned herein includes at least the following two situations:

[0025] 1. Part of the sealing member is separated from the housing along with the magnetic member, forming the opening on the sealing member;

[0026] 2. All seals are separated from the shell along with the magnetic component, forming the opening on the shell.

[0027] Furthermore, the sealing member is a sealing sheet adapted to the shape and size of the first through-hole, with an annular groove defined along its circumference on its outer surface; a portion of the sealing sheet is positioned within the first through-hole, and an edge of the first through-hole is embedded in the annular groove of the sealing sheet. The sealing sheet is preferably made of a non-metallic material that is non-reactive with the electrolyte.

[0028] Furthermore, a magnetic member securing portion is provided on the outer surface of the sealing sheet (herein, the outer surface of the sealing sheet is defined as the surface of the sealing sheet facing away from the inner cavity of the single cell). A second annular groove is defined around the periphery of the magnetic member securing portion, and the magnetic member is secured to the magnetic member securing portion. The magnetic attraction mechanism facilitates the magnetic member to form the aforementioned opening in the sealing sheet through the second annular groove. This effect is further enhanced when the second annular groove has a V-shaped cross-section.

[0029] In order to further improve the reliability of unpacking and reduce the difficulty of unpacking, the present invention also provides a third annular groove on the inner surface of the sealing sheet (here the inner surface of the sealing sheet is the surface of the sealing sheet located in the inner cavity of the single battery), and the third annular groove is concentric with the third annular groove and has the same radius.

[0030] Furthermore, the magnetic component includes a magnetic attraction portion and a fixing portion;

[0031] The magnetic component fixing portion is a concave cavity located on the outer surface of the sealing plate, and a blocking portion is provided at the open end of the concave cavity;

[0032] The magnetic component is located within the cavity, with the magnetic portion exposed at the cavity opening, and the fixed portion inserted between the cavity bottom and the blocking portion. Exposing the magnetic portion at the cavity opening allows an external magnetic device to act directly on the magnetic portion, improving package opening reliability. The magnetic device attracts the magnetic portion, which in turn drives the fixed portion, which in turn applies a force to the blocking portion. Under the action of the blocking portion, the sealing sheet tears from the second annular groove, forming an opening, or directly falls off from the second annular groove, forming an opening.

[0033] After falling off, the detached structure can be removed from the shared chamber through the corresponding device without introducing external impurities, and the unpacking process will not affect the performance of the single battery; in addition, after being removed, the magnetic component can be reused.

[0034] Furthermore, the magnetic attraction portion is a circular iron sheet; the fixing portion is at least two ring-shaped iron sheets, and the two ring-shaped iron sheets are fixed concentrically with the circular iron sheet and relatively to the outer peripheral surface of the circular iron sheet; preferably, the two ring-shaped iron sheets are fixed symmetrically to the outer peripheral surface of the circular iron sheet relative to the center of the circular iron sheet;

[0035] The concave cavity is a cylindrical cavity, and its radius is larger than the maximum radius of the magnetic component; the blocking part is two annular fan-shaped baffles concentrically fixed at the open end of the concave cavity (preferably, the blocking part is two annular fan-shaped baffles symmetrically fixed at the open end of the concave cavity); the inner diameter of the annular fan-shaped baffle is larger than the outer diameter of the magnetic attraction part, and the shape of the open end of the concave cavity with the two annular fan-shaped baffles is adapted to the shape of the magnetic component, ensuring that the magnetic component can be placed into the concave cavity from the open end. After placement, the magnetic component is rotated so that its fixed part is located between the bottom of the concave cavity and the blocking part.

[0036] Furthermore, the first end of the annular fan-shaped baffle is provided with a limit platform extending toward the bottom of the concave cavity. When the fixed portion of the magnetic component contacts the limit platform, it proves that the magnetic component has been rotated into place; the second end face is provided with an inclined surface inclined toward the bottom of the concave cavity, so that the fixed portion of the magnetic component can be screwed into between the bottom of the concave cavity and the blocking portion.

[0037] Furthermore, a limiting groove is formed on the annular sector-shaped baffle; a limiting protrusion is provided on the annular sector-shaped iron sheet along its thickness direction; and the limiting protrusion is snapped into the limiting groove. The limiting protrusion and the limiting groove cooperate with each other to prevent circumferential movement of the magnetic component, ensuring the stability of the magnetic component after installation.

[0038] Furthermore, the seal can usually be a non-metallic injection molded part, which is fixed at the position of the first through hole by injection molding to seal the first through hole. The non-metallic seal is generally made of a material that does not react with the electrolyte (such as polypropylene, which has no effect on the performance of the battery and the electrolyte). Compared with metal parts, it is easier to open. In addition, during the opening process, even if there are flying chips flying out and adhering between the positive and negative electrodes, it will not cause a short circuit in the battery. At the same time, the seal can be fixed at the first through hole by a single injection molding to achieve the sealing of the first through hole. The process is simple, easy to process, and has a high yield rate.

[0039] The present invention also provides a single cell battery, which is special in that it includes the above-mentioned single cell battery shell component.

[0040] Compared with the unpacking methods corresponding to the two types of sealing films in the background art, the present invention has at least the following advantages:

[0041] 1. Compared with the method of opening the package using a sealing film that is soluble in electrolyte, firstly, the opening piece of the present invention only needs to use a magnetic component (including a magnetic material such as a magnetic metal or a magnet), and the external opening device can use a conventional magnetic attraction device (with the property of attracting the above-mentioned magnetic component), which reduces the difficulty of material selection; secondly, the present invention can complete the opening of all single batteries at one time through magnetic attraction, which makes the unpacking process convenient and efficient.

[0042] 2. Compared with the method of using a pulling tool to open the package, the magnetic suction device of the present invention does not need to be in direct contact with the magnetic component and can be directly placed outside the shared chamber for operation. The operation is simple and easy to implement.

[0043] 3. Compared with the method of opening the package using a sealing film that is soluble in electrolyte, the present invention can use corresponding tooling to remove the detached magnetic component and at least part of the weak area adsorbed on the magnetic component from the shared cavity without introducing external impurities. The unpacking process will not affect the performance of the single battery; in addition, after removal, the magnetic component can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of an explosion of a large-capacity battery in the background art;

[0045] Figure 2 Schematic diagram of the partial structure of a single cell in Example 1;

[0046] Figure 3 This is a schematic structural diagram of a single cell in Example 1;

[0047] Figure 4 This is a schematic diagram of a partial explosion of a semi-finished single cell in Example 2;

[0048] Figure 5 This is a schematic structural diagram of the bottom support plate in Example 2;

[0049] Figure 6 This is a schematic structural diagram of a semi-finished single cell of Example 2;

[0050] Figure 7 A partial cross-sectional view of the lower cover plate of the semi-finished single cell of Example 2;

[0051] Figure 8 This is a schematic diagram of a partial explosion of a single cell in Example 2;

[0052] Figure 9 Schematic diagram of the single cell structure of Example 2 Figure 1 ;

[0053] Figure 10 Schematic diagram of the structure of the magnetic component in Example 2;

[0054] Figure 11 This is a schematic structural diagram of the sealing member in Example 2 from a first perspective;

[0055] Figure 12 This is a schematic structural diagram of the sealing member in Example 2 from a second perspective;

[0056] Figure 13 A partial cross-sectional view of the lower cover area of ​​a single cell in Example 2;

[0057] Figure 14 Schematic diagram of the single cell structure of Example 2 Figure 2 ;

[0058] Figure 15 A partial cross-sectional view of a single cell of Example 2;

[0059] Figure 16 This is a schematic diagram of the explosion structure of a local position of a single cell in Example 2;

[0060] Figure 17 This is a schematic diagram of the partial structure of a single cell in Example 2;

[0061] Figure 18 This is a schematic structural diagram of the semi-finished shell in Example 2;

[0062] Figure 19 This is a structural schematic diagram of a semi-finished shell with a bottom support plate in Example 2;

[0063] Figure 20 Schematic diagram of the structure of the semi-finished housing with a seal in Example 2;

[0064] Figure 21 Schematic diagram of the structure of the semi-finished shell with magnetic components in Example 2;

[0065] Figure 22 This is a structural schematic diagram of the process of installing the battery core assembly into the semi-finished housing with a magnetic component in Example 2;

[0066] Figure 23 This is a structural diagram of the process of installing the upper cover in Example 2;

[0067] Figure 24 Schematic diagram of the structure of a single cell in Example 3;

[0068] The accompanying drawings are denoted as follows:

[0069] 01. Housing; 02. Electrolyte shared chamber; 03. Gas shared chamber;

[0070] 1. Single battery; 11. Shell; 111. Cylinder; 112. Lower cover; 113. Upper cover; 114. Cell assembly; 12. Pole; 121. Second end face; 122. Side face; 123. Through groove; 2. First area of ​​shell component; 3. First annular groove; 4. Magnetic component; 41. Magnetic attraction portion; 42. Fixing portion; 43. Operating hole; 44. Limiting protrusion; 5. First through hole; 51. First through hole edge; 6. Sealing member; 61. Annular groove; 62. Magnetic component fixing portion; 63. Second annular groove; 64. Third annular groove; 65. Blocking portion; 651. First end of annular fan-shaped baffle; 652. Limiting platform; 653. Second end of annular fan-shaped baffle; 654. Inclined surface; 655. Limiting groove; 7. Bottom support plate; 71. Avoidance hole; 72. Support rib; 73. Second through hole. DETAILED DESCRIPTION

[0071] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0072] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0073] In the description of the present invention, it should be noted that the terms "top, bottom, upper, lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first, second, third, etc." are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] The present invention provides a single cell battery housing component and a single cell battery. The single cell battery described herein is a prismatic battery battery, comprising an upper cover, a lower cover, a barrel, a cell assembly, and an electrolyte. The upper or lower cover and the barrel can be integrally formed. The cell assembly, which can be referred to as an electrode assembly, comprises a positive electrode, a separator, and a negative electrode arranged in sequence, assembled using a lamination or winding process. The upper cover, barrel, and lower cover constitute the single cell battery housing, within which the cell assembly and electrolyte are located.

[0075] The battery cell assembly described herein may also be a commercially available square shell battery with through holes.

[0076] The single cell housing member described herein may be a single cell housing, or may be a partial structure of a single cell housing, such as at least one of a single cell upper cover plate, a single cell lower cover plate, or a single cell cylinder.

[0077] The present invention sets a magnetic component on the single battery shell component. For the convenience of description, the present invention defines the shell component area where the magnetic component is fixed as the first shell component area; when the magnetic component is attracted by the magnetic attraction device, an opening is formed on the shell component that passes through the shell inner cavity.

[0078] It should be noted here that:

[0079] 1. The aforementioned “forming an opening on the shell member that passes through the inner cavity of the shell”, wherein the opening can be located in the first region of the shell member, or in a shell region outside the first region of the shell member.

[0080] 2. The magnetic component is made of a magnetic metal, such as iron, cobalt, or nickel. Based on cost considerations, iron is preferred in the present invention.

[0081] 3. The magnetic component mentioned above can also be a magnet.

[0082] 4. If the battery cell assembly is a commercially available square-shell battery with a through hole, the opening is connected to the through hole on the commercially available square-shell battery.

[0083] 5. The external magnetic attraction device is a device that has the property of attracting the above-mentioned magnetic component, for example, it can be a permanent magnet or an electromagnet.

[0084] To achieve this opening with minimal suction, the present invention improves the first region of the battery cell housing. The primary approach is to create a weak area within the first region of the housing. A weak area here can be understood as an area that is more easily opened to form an opening than other areas of the housing. For example, the thickness of the first region of the housing can be directly reduced to create the weak area. Alternatively, a first annular groove can be formed in the first region of the housing, with the area enclosed by the first annular groove serving as the weak area. Alternatively, a first through-hole can be formed in the first region of the housing and then sealed with a sealant, with the area of ​​the first through-hole containing the sealant serving as the weak area.

[0085] After the weak area is set, the magnetic component is directly fixed to the weak area. Under the action of the external magnetic attraction device, the magnetic component can more easily drive the weak area to separate from the shell to form the above-mentioned opening.

[0086] Compared with the method of opening the package using a sealing film that can be dissolved in electrolyte, firstly, the opening piece of the present invention only needs to use a magnetic component, and the external opening device can use a conventional magnetic attraction device, which reduces the difficulty of material selection; secondly, the present invention can complete the unpacking of all single batteries at one time through magnetic attraction, which makes the unpacking process convenient and efficient.

[0087] Compared with the method of using a pulling tool to open the package, the magnetic suction device of the present invention does not need to be in direct contact with the magnetic component. The magnetic suction device can be directly placed outside the shared chamber for operation, which is simple to operate and easy to implement.

[0088] The single cell provided by the present invention is mainly used to construct a large-capacity battery, such as the large-capacity battery described in the background art Chinese patent CN220324596U, and can also be used to construct the large-capacity batteries disclosed in Chinese patents CN117477063A, CN117477186A, and CN115275453A.

[0089] Such a large-capacity battery comprises at least a plurality of single cells and at least one shared chamber;

[0090] The shared chamber described here is the shared chamber described in CN220324596U, the hollow component described in CN117477063A, the first hollow component and the second hollow component described in CN117477186A, and the electrolyte shared channel described in CN115275453A.

[0091] When the shell component is the lower cover of the single cell, the shared chamber can be used as an electrolyte shared chamber. An external magnetic device is used to attract the magnetic component to form an opening in the lower cover. The electrolytes in the inner cavities of each single cell are connected through the electrolyte shared chamber, so that the electrolytes of all single cells are in the same system, reducing the differences between the electrolytes of each single cell, improving the consistency between the single cells to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0092] When the shell component is the upper cover of a single cell, the shared chamber can also be used as a gas sharing chamber. An external magnetic device is used to attract the magnetic component to form an opening in the upper cover. The gas in the inner cavity of each single cell is connected through the gas sharing chamber, so that the gas in the inner cavity of the entire large-capacity battery is balanced, which improves the cycle life of the large-capacity battery to a certain extent.

[0093] When the shell component is a single cell cylinder, the shared chamber can be used as a gas-liquid shared chamber. An external magnetic device is used to attract the magnetic component to form an opening on the side wall of the cylinder. The electrolyte and gas in the inner cavity of each single cell can be connected through the gas-liquid shared chamber, so that the electrolyte and gas of all single cells are in the same system, reducing the differences between the single cells and improving the consistency between the single cells to a certain extent, thereby improving the cycle life of the large-capacity battery to a certain extent.

[0094] The following describes in detail the weak areas of different structures and the corresponding magnetic components in conjunction with the accompanying drawings and specific embodiments.

[0095] Example 1

[0096] like Figure 2 As shown in the figure, it is a schematic diagram of the local structure of the single cell 1 of this embodiment. It can be seen from the figure that the shell component of this embodiment is the lower cover plate of the single cell, and the first area 2 of the shell component is located at the lower cover plate 112 of the single cell 1. Two mutually isolated first annular grooves 3 are provided on the lower cover plate 112 of the single cell 1. The area encircled by each first annular groove 3 serves as a weak area, thereby forming two weak areas.

[0097] As can be seen from the figure, the two weak areas are close to the two sides of the lower cover 112. When the battery cell inside the single cell 1 adopts a winding core, there is a large space between the side wall of the single cell 1 shell 11 in the width direction and the winding core. When the weak area is opened close to the edge in the width direction of the lower cover 112, after the weak area is opened, the electrolyte in the inner cavity of the electrolyte sharing chamber can better enter the inner cavity of the single cell 1.

[0098] In some other embodiments, a first annular groove 3 may be provided at the geometric center of the lower cover plate 112 of the single battery 1. Alternatively, two or more first annular grooves 3 may be provided on the lower cover plate 112 of the single battery 1 according to specific requirements.

[0099] This embodiment does not limit the shape of the first annular groove 3 , that is, the shape of the weak area is not limited. It can be circular as shown in the figure, or rectangular, elliptical, etc.

[0100] The depth of the first annular groove 3 needs to meet the following two conditions:

[0101] 1. The groove depth should not be too deep to ensure that the first annular groove 3 has a certain strength, so as to avoid the first annular groove 3 being too weak before opening the package, which may cause the single battery 1 to be scrapped;

[0102] 2. The groove depth cannot be too shallow to ensure that the magnetic device can smoothly open the opening from the first annular groove 3 to ensure a better sharing effect.

[0103] The cross section of the first annular groove 3 can be U-shaped or V-shaped. Compared with the U-shaped cross section, the V-shaped cross section is more likely to crack and form an opening under the action of suction.

[0104] like Figure 3 As shown, this embodiment fixes the magnetic component 4 on the weak area. Normally, the magnetic component 4 is fixed on the outer surface of the weak area (the outer surface of the weak area is the surface of the weak area away from the inner cavity of the shell) so that the external magnetic attraction device can better act on the magnetic component 4.

[0105] However, the present invention does not exclude the solution of fixing the magnetic component 4 on the inner surface of the weak area (the inner surface of the weak area is the surface of the weak area located in the inner cavity of the shell). In such a solution, it is only necessary to ensure that the magnetic component 4 does not affect the environment of the battery cavity. For example, if the magnetic component 4 is an iron sheet, the iron sheet can be wrapped with a protective film and then fixed to the weak area. Such a protective film should meet two requirements. First, it should not react with the electrolyte. Second, it should not affect the magnetism of the magnetic component 4.

[0106] In this embodiment, the magnetic member 4 is an iron sheet, and its shape can be adapted to the shape of the weak area (e.g. Figure 3 As shown), it can also be selected according to actual conditions. In order to improve the reliability of unpacking, under the premise of permitting, the surface area of ​​the first surface of the iron sheet can be increased as much as possible, wherein the first surface of the iron sheet is the surface facing the magnetic attraction device, that is, the surface interacting with the magnetic attraction device.

[0107] It can be fixed on the weak area by gluing or screwing. It should be noted that during the fixing process, the sealing of the weak area needs to be ensured at all times.

[0108] The single cell 1 of this embodiment can be prepared by the following process:

[0109] In this embodiment, the lower cover plate 112 and the barrel 111 are integrally formed. First, two first annular grooves 3 are engraved on the lower cover plate 112. Then, according to conventional assembly methods, the electrode assembly is installed, the upper cover plate 113 is welded, and finally, the magnetic member 4 is secured to the two weak areas. Alternatively, the magnetic member 4 can be secured to the two weak areas before the electrode assembly is installed. Of course, it is also possible to directly engrave the two first annular grooves 3 on the lower cover plate of an already assembled single cell and then secure the magnetic member 4 to the two weak areas.

[0110] After the large-capacity battery is assembled using the above-mentioned single battery 1, the liquid circuit can be unpacked through the following process:

[0111] Place the external magnetic device outside the electrolyte sharing chamber so that its active surface faces the first surface of the magnetic component 4 (the first surface of the iron sheet) of each single battery 1. The magnetic device attracts the magnetic component 4, and the magnetic component 4 drives the weak area to tear from the first annular groove 3 to form an opening, or the magnetic component 4 drives the weak area to directly fall off from the first annular groove 3 to form an opening. This allows the electrolyte sharing chamber to be connected to the inner cavity of the single battery 1, so that the electrolytes of all single batteries 1 are in the same system, achieving an electrolyte sharing effect. During the unpacking process, even if one weak area is not torn or fallen off, the electrolyte sharing effect can be achieved through another weak area (the weak area is torn or completely fallen off).

[0112] After unpacking, in order to prevent the magnetic component 4 from being immersed in the electrolyte and affecting the performance of the large-capacity battery, as mentioned above, a protective film can be coated on the magnetic component 4. The protective film should also have two characteristics: first, it should not react with the electrolyte, and second, it should not affect the magnetism of the magnetic component 4. Generally, materials such as aluminum, copper, zinc, nickel, silver, epoxy resin, PE, PP, polytetrafluoroethylene or EPDM rubber can be selected.

[0113] Alternatively, after unpacking, the magnetic member 4 and any loosened portions of its connection from the shared electrolyte chamber can be removed from the package to overcome the issue of the magnetic member 4 being immersed in the electrolyte and thus affecting the performance of the large-capacity battery. To prevent electrolyte spillage during removal, the large-capacity battery can be inverted so that the shared electrolyte chamber is located upwards. After removal, the magnetic member 4 can be reused.

[0114] Example 2

[0115] Different from Example 1, Figures 4 to 9 As shown, the weak area in this embodiment is the first through hole 5 area with the seal 6. The magnetic component 4 is fixed on the seal 6; when the magnetic component 4 is attracted by the magnetic attraction device, at least part of the seal 6 is separated from the housing 11 along with the magnetic component 4, forming the opening.

[0116] Figure 4 The schematic diagram of the partial explosion of the semi-finished single cell of this embodiment is a semi-finished single cell 1 having a weak area but not yet installed with a magnetic member 4; as can be seen from the figure, in this embodiment, two first through holes 5 are opened in the lower cover plate 112 of the single cell 1 to install the sealing member 6, such as Figure 5 As shown, in this embodiment, two avoidance holes 71 are also provided on the bottom support plate 7 between the lower cover plate 112 and the electrode assembly. Figure 5 It can also be seen that in this embodiment, a plurality of supporting ribs 72 are provided on the bottom support plate 7 and a plurality of second through holes 73 are opened at the same time, so as to facilitate the introduction of electrolyte into the battery cell assembly 114 and improve the electrolyte sharing effect.

[0117] In this embodiment, the two first through holes 5 are close to the two sides of the lower cover plate 112. When the battery cell inside the single battery 1 adopts a winding core, there is a large space between the side wall of the single battery 1 shell 11 in the width direction and the winding core. When the two first through holes 5 are opened close to the edge in the width direction of the lower cover plate 112, after the opening is formed at the position of the first through holes 5, the electrolyte in the inner cavity of the electrolyte sharing chamber can better enter the inner cavity of the single battery 1.

[0118] This embodiment does not limit the shape of the first through hole 5 , that is, the shape of the weak area is not limited. It can be circular as shown in the figure, or rectangular, elliptical, etc.

[0119] The size of the first through hole 5 needs to meet the following conditions:

[0120] 1. The first through hole 5 cannot be too large to ensure that the entire lower cover 112 has a certain strength, so as to avoid the lower cover 112 being scrapped due to poor strength before the seal 6 at the first through hole 5 is opened;

[0121] 2. The first through hole 5 cannot be too small to ensure that after the seal 6 at the first through hole 5 is opened, the electrolyte area in the inner cavity of each single battery 1 and the inner cavity of the electrolyte sharing chamber are smoothly connected to ensure a good sharing effect.

[0122] In other embodiments, a first through hole 5 may be provided at the geometric center of the lower cover plate 112 of the single cell 1. Alternatively, two or more first through holes 5 may be provided on the lower cover plate 112 of the single cell 1 according to specific needs. The size of the first through hole 5 still needs to meet the above two conditions.

[0123] Figure 6 This is a schematic structural diagram of a semi-finished single cell of this embodiment; Figure 7 It is a partial cross-sectional view of the lower cover plate 112 of the semi-finished single cell; Figure 6 and Figure 7 It can be seen that in this embodiment, the sealing member 6 is a sealing sheet that is adapted to the shape and size of the first through hole 5, and an annular groove 61 is provided on the outer peripheral surface of the sealing sheet along its circumference; a partial area of ​​the sealing sheet is located in the first through hole 5, and the edge 51 of the first through hole is embedded in the annular groove 61 of the sealing sheet.

[0124] In this embodiment, the seal 6 can be a non-metallic injection molded part, which is fixed to the position of the first through hole 5 by injection molding to seal the first through hole 5. The non-metallic seal 6 is generally made of a material that does not react with the electrolyte (such as polypropylene, which has no effect on the performance of the battery and the electrolyte). Compared with metal parts, it is easier to open. In addition, during the opening process, even if flying debris flies out and adheres between the positive and negative electrodes, it will not cause a short circuit in the battery. At the same time, the seal 6 can be fixed to the first through hole 5 by a single injection molding to achieve the sealing of the first through hole 5. The process is simple, easy to process, and has a high yield rate.

[0125] In some other embodiments, conventional machining methods may also be used to fix the sealing member on the first through hole.

[0126] from Figure 7 As can be seen in the figure, the first through hole 5 of this embodiment is a stepped through hole. The large hole of the stepped through hole is located near the outer surface of the lower cover plate 112, while the small hole of the stepped through hole is located near the inner surface of the lower cover plate 112. The diameter of the avoidance hole 71 on the bottom support plate 7 is larger than the diameter of the small hole of the stepped through hole and is comparable to the diameter of the large hole of the stepped through hole. The stepped through hole ensures that the outer surface of the seal 6 and the outer surface of the lower cover plate 112 are flush with each other, improving the flatness of the bottom of the single cell 1.

[0127] It should be noted here that the outer surface of the lower cover plate 112 is the surface of the lower cover plate 112 away from the inner cavity of the shell 11 , and the inner surface of the lower cover plate 112 is the surface of the lower cover plate 112 located in the inner cavity of the shell 11 .

[0128] A magnetic component fixing portion 62 is provided on the outer surface of the sealing sheet for fixing the magnetic component 4. Figure 7 It can be seen that the magnetic component fixing portion 62 of this embodiment is a concave cavity opened on the outer surface of the sealing sheet.

[0129] In some other embodiments, the outer surface of the sealing sheet can be directly used as the magnetic component fixing portion 62, and the magnetic component 4 can be directly fixed to the outer surface of the sealing sheet by bonding or screwing.

[0130] In order to use less suction force, an opening is formed on the sealing sheet, such as Figure 7As shown, in this embodiment, a second annular groove 63 is provided on the outer surface of the sealing sheet along the circumference of the magnetic component fixing portion 62. Under the action of the magnetic attraction device, the magnetic component 4 is more likely to form the above-mentioned opening on the sealing sheet from the second annular groove 63. When the second annular groove 63 is set to have a V-shaped cross-section, the above-mentioned effect is more easily achieved. In order to further improve the reliability of unpacking and reduce the difficulty of unpacking, the present embodiment also provides a third annular groove 64 on the inner surface of the sealing sheet. The third annular groove 64 is concentric with the second annular groove 63 and has the same radius. After the third annular groove 64 is opened, the thickness of the sealing sheet at the second annular groove 63 and the third annular groove 64 is reduced, making it easier to form the above-mentioned opening at this location.

[0131] The depths of the second annular groove 63 and the third annular groove 64 also need to meet the following two requirements:

[0132] 1. The groove depth should not be too deep to ensure that the second annular groove 63 and the third annular groove 64 have a certain strength, so as to avoid the second annular groove 63 and the third annular groove 64 being too weak before opening the package, which may cause the single battery 1 to be scrapped;

[0133] 2. The groove depth cannot be too shallow to ensure that the magnetic device can smoothly open the opening from the second annular groove 63 and the third annular groove 64 to ensure a better sharing effect.

[0134] Figure 8 and Figure 9 They are respectively a schematic diagram of a partial explosion of a single cell 1 of this embodiment and a schematic diagram of the structure of a single cell 1 of this embodiment; Figure 8 and Figure 9 It can be seen that in this embodiment, the magnetic component 4 is fixed on the magnetic component fixing portion 62 .

[0135] Figure 10 The following is a schematic diagram of the structure of the magnetic component 4 of this embodiment. The magnetic component 4 of this embodiment is divided into two parts according to their functions, which can be defined as a magnetic attraction portion 41 and a fixed portion 42. The magnetic attraction portion 41 is mainly used to interact with an external magnetic attraction device and can be made of a magnetic metal. The fixed portion 42 is mainly used to fix the entire magnetic component 4 to the magnetic component fixing portion 62. There is no specific limitation on its material. However, for ease of processing, the material of the fixed portion 42 of this embodiment is the same as that of the magnetic attraction portion 41. Based on cost considerations, iron is preferably used in this embodiment.

[0136] from Figure 10 It can be seen that in this embodiment, the magnetic attraction part 41 is a circular iron sheet, and the fixing part 42 is two annular fan-shaped iron sheets; the two annular fan-shaped iron sheets are fixed symmetrically on the outer peripheral surface of the circular iron sheet relative to the center of the circular iron sheet; the thickness of the annular fan-shaped iron sheet is slightly smaller than the thickness of the circular iron sheet.

[0137] Corresponding to the magnetic member 4, the magnetic member fixing portion 62 of this embodiment is as follows Figure 11 、 Figure 12 and Figure 13 As shown:

[0138] Figure 11 and Figure 12 Schematic diagrams of the sealing member 6 of this embodiment from different perspectives. In this embodiment, the magnetic component fixing portion 62 is a concave cavity located on the outer surface of the sealing plate, and a blocking portion 65 is provided at the open end of the concave cavity. After the blocking portion 65 is provided, the size of the open end of the concave cavity needs to ensure that the above-mentioned magnetic member 4 can be placed into the concave cavity from the open end.

[0139] The concave cavity is a cylindrical cavity, and its radius is larger than the maximum radius of the magnetic component 4; the blocking part 65 is two annular fan-shaped baffles symmetrically fixed at the open end of the concave cavity; the inner diameter of the annular fan-shaped baffle is larger than the outer diameter of the magnetic attraction part 41, and the shape of the open end of the concave cavity with two annular fan-shaped baffles is adapted to the shape of the magnetic component 4, ensuring that the magnetic component 4 can be placed into the concave cavity from the open end.

[0140] like Figure 14 and Figure 15 As shown, after the magnetic member 4 is placed into the cavity from the opening end of the cavity, the magnetic attraction portion 41 is exposed from the opening end of the cavity, and the magnetic member 4 is rotated so that its fixing portion 42 is located between the bottom of the cavity and the blocking portion 65 (see Figure 13 and Figure 15 Two operating holes 43 are provided on the magnetic portion 41. The head of a twisting tool (such as needle-nose pliers or round-nose pliers) is inserted into the operating holes 43 to rotate the magnetic member 4. The exposed end of the magnetic portion 41 allows an external magnetic device to directly act on the magnetic portion 41, improving the reliability of package opening.

[0141] In some other embodiments, the blocking portion 65 can also be a rectangular plate; as long as the magnetic component 4 is placed in the cavity, the fixing portion 42 of the magnetic component 4 is positioned by the blocking portion 65 to prevent the magnetic component 4 from falling out of the cavity.

[0142] from Figure 12 It can also be seen that in this embodiment, a limit platform 652 extending toward the bottom of the concave cavity is provided at the first end 651 of the annular fan-shaped baffle. When the fixing portion 42 of the magnetic component 4 contacts the limit platform 652, it proves that the magnetic component 4 has been rotated into place; the end face of the second end 653 of the annular fan-shaped baffle is provided with an inclined surface 654 inclined toward the bottom of the concave cavity, so that the fixing portion 42 of the magnetic component 4 can be screwed into between the bottom of the concave cavity and the blocking portion 65.

[0143] Figure 16 This is a schematic diagram of the explosion structure of a local position of a single cell 1 in this embodiment. Figure 17Schematic diagram of the local structure of the single cell 1 of this embodiment; as can be seen from the figure, in order to further improve the stability of the magnetic component 4 in the installation portion of the magnetic component 4, a limiting groove 655 is provided on the annular fan-shaped baffle in this embodiment; the fixing portion 42 is provided with a limiting protrusion 44 extending along its thickness direction; because the blocking portion 65 has a certain elasticity, when the magnetic component 4 is placed in the concave cavity from the opening end of the concave cavity and the magnetic component 4 is rotated by a twisting tool, the blocking portion 65 is slightly deformed by the action of the limiting protrusion 44. After being rotated into place, the limiting protrusion 44 is snapped into the limiting groove 655. The limiting protrusion 44 cooperates with the limiting groove 655 to prevent the circumferential movement of the magnetic component 4, thereby ensuring the stability of the magnetic component 4 after being installed in place.

[0144] In this embodiment, the single cell 1 can be prepared through the following process:

[0145] Step 1, such as Figure 18 As shown, two first through holes 5 are provided on the lower cover plate 112 of the single battery 1. In this embodiment, the lower cover plate 112 of the single battery 1 and the cylinder 111 are integrated. For the convenience of description, the integrated part is defined as a semi-finished shell 11. Two corresponding avoidance holes 71 are provided on the bottom support plate 7. The bottom support plate 7 is placed in the semi-finished shell 11 to form the following Figure 19 The semi-finished housing 11 is shown.

[0146] Step 2, such as Figure 20 As shown, sealing members 6 are formed at the two first through holes 5 based on an injection molding process to seal the first through holes 5;

[0147] Step three, such as Figure 21 , fixing the magnetic member 4 on the magnetic member fixing portion 62 of the seal 6;

[0148] Step 4: Figure 22 , install the battery cell assembly 114 into the semi-finished housing 11 of step 3;

[0149] Step five, such as Figure 23 , the upper cover plate 113 of the single battery 1 is sealed and fixed to the open end of the semi-finished shell 11.

[0150] It should be noted that the above step 3 can also be performed after step 5. That is, steps 4 and 5 can be performed directly after step 2. The battery cell assembly 114 is installed in the semi-finished housing 11 of step 2; the upper cover plate 113 of the single battery 1 is sealed and fixed to the open end of the semi-finished housing 11, and finally the magnetic member 4 is fixed to the magnetic member fixing portion 62 of the seal 6.

[0151] After the large-capacity battery is assembled using the above-mentioned single battery 1, the liquid circuit can be unpacked using the following process.

[0152] Place the external magnetic device outside the electrolyte sharing chamber so that its active surface faces the magnetic attraction portion of the magnetic component 4 of each single battery 1. The magnetic device attracts the magnetic component 4, which drives the seal 6 to tear from the second annular groove 63 and the third annular groove 64 to form an opening, or the magnetic component 4 drives the seal 6 to directly fall off from the second annular groove 63 and the third annular groove 64 to form an opening. This allows the electrolyte sharing chamber to be connected to the inner cavity of the single battery 1, so that the electrolytes of all single batteries 1 are in the same system, achieving an electrolyte sharing effect. During the unpacking process, even if one weak area is not torn or fallen off, the electrolyte sharing effect can be achieved through another weak area (the weak area is torn or completely fallen off).

[0153] After unpacking, in order to prevent the magnetic component 4 from being immersed in the electrolyte and affecting the performance of the large-capacity battery, as mentioned above, a protective film can be coated on the magnetic component 4. The protective film should also have two characteristics: first, it should not react with the electrolyte, and second, it should not affect the magnetism of the magnetic component 4. Generally, materials such as aluminum, copper, zinc, nickel, silver, epoxy resin, PE, PP, polytetrafluoroethylene or EPDM rubber can be selected.

[0154] Alternatively, after unpacking, the magnetic member 4 and any loosened portions of its connection from the shared electrolyte chamber can be removed from the package to overcome the issue of the magnetic member 4 being immersed in the electrolyte and thus affecting the performance of the large-capacity battery. To prevent electrolyte spillage during removal, the large-capacity battery can be inverted so that the shared electrolyte chamber is located upwards. After removal, the magnetic member 4 can be reused.

[0155] Example 3

[0156] like Figure 24 As shown, unlike the above embodiment, this embodiment further comprises a magnetic member 4 disposed on the upper cover plate 113 of the single cell 1 (i.e., the single cell housing components in this embodiment are the single cell upper cover plate and the single cell lower cover plate). When the magnetic member 4 is attracted by the magnetic attraction device, an opening is formed on the housing 11 that penetrates the inner cavity of the housing 11. The specific structure and installation method of the magnetic member 4 are the same as those in the above embodiment and will not be repeated here.

[0157] After the large-capacity battery is assembled using the above-mentioned single battery 1, it can be unpacked in the same manner as in Example 1 and Example 2. The following is an example of the same method as in Example 2:

[0158] An external magnetic device is placed outside the gas-sharing chamber, with its active surface facing the magnetic attraction portion of the magnetic member 4 of each single battery 1. The magnetic device attracts the magnetic member 4, which in turn drives the seal to tear through the second and third annular grooves, forming an opening. Alternatively, the magnetic member 4 drives the seal to directly fall off from the second and third annular grooves, forming an opening. This allows the gas-sharing chamber to communicate with the inner cavity of the single battery 1, allowing the gas from all single batteries 1 to be in the same system, achieving a gas-sharing effect.

[0159] In addition, from Figure 24 It can also be seen that in this embodiment, a through groove 123 is provided in the terminal post 12 of the single cell 1, which serves as a clamping portion for the heat transfer tube. In this embodiment, the terminal post 12 of the single cell 1 is cylindrical, including a first end face, a second end face 121, and a side face 122 (the first end face and the second end face 121 are parallel to each other). The through groove 123 is provided in the side face 122 of the terminal post 12, that is, the opening of the through groove 123 is located on the side face 122.

[0160] In some other embodiments, a through hole may be further provided on the side surface 122 , that is, the opening of the through hole is located on the side surface 122 .

[0161] In some other embodiments, a through slot 123 may be further provided on the second end surface 121 , that is, an opening of the through slot 123 is located on the second end surface 121 .

[0162] The second end face 121 serves as the electrical connection portion of the pole 12 and is used to connect to the electrical connector to achieve electrical connection between each single battery 1 and / or two large-capacity batteries; the first end face is used to electrically connect to the battery cell assembly 114 in the shell 11 of the single battery 1.

[0163] Providing a through-slot 123 or through-hole on the side surface 122 increases the contact area between the heat transfer tube and the inner wall of the through-slot 123 or through-hole, compared to providing a through-slot 123 on the second end surface 121, resulting in higher heat exchange efficiency. Furthermore, when the through-slot 123 or through-hole is located on the side surface 122, the entire area of ​​the second end surface 121 can be used as an electrical connection area. It is also possible to simultaneously provide two through-slots 123 or through-holes on the side surface 122 of the pole 12 to increase the number of heat transfer tubes that can be placed, further improving heat exchange efficiency. Compared to through-hole structures, through-slots 123 make heat transfer tubes easier to install.

[0164] The cross section of the through groove 123 is C-shaped. The opening width of the through groove 123 is smaller than the widest part of the through groove 123. This design is conducive to the interference fit of the heat transfer tube in the through groove 123. The arc formed at both ends of the C-shaped through groove 123 has natural tension, which is conducive to tightly fitting the heat transfer tube in the through groove 123.

[0165] The heat transfer tube is fixed in the through groove 123 or through hole (the heat transfer tube is insulated from the single battery 1). When the temperature of the large-capacity battery is higher than the set threshold, a low-temperature heat transfer medium is introduced into the heat transfer tube to cool the large-capacity battery. When the temperature of the large-capacity battery is lower than the set threshold, a high-temperature heat transfer medium is introduced into the heat transfer tube to heat the large-capacity battery. By controlling the temperature of the heat transfer medium, the large-capacity battery can always operate at its normal operating temperature.

[0166] In other embodiments, the magnetic member 4 may be disposed solely on the upper cover plate 113 of the single cell 1. When attracted by the magnetic attraction device, the magnetic member 4 forms an opening through the inner cavity of the housing 11 on the upper cover plate 113 of the single cell 1. The specific structure, installation method, and corresponding unpacking method of the magnetic member 4 are the same as those in the above embodiment and will not be further described here.

[0167] In some other embodiments, a magnetic member 4 may be provided on the side wall of the cylindrical body 111 of the single cell 1 (i.e., the single cell housing member is the single cell cylindrical body). When the magnetic member 4 is attracted by the magnetic attraction device, an opening is formed on the side wall of the cylindrical body 111 that penetrates the inner cavity of the housing 11. The specific structure, installation method, and unpacking method of the magnetic member 4 are the same as those in the above embodiment and will not be repeated here.

Claims

1. A single battery housing component, characterized in that: A magnetic component is provided on the first area of ​​the shell component. When the magnetic component is attracted by the magnetic attraction device, an opening penetrating the inner cavity of the shell is formed on the shell component.

2. The single cell housing member according to claim 1, wherein: A weak area is set on the first area of ​​the shell component; the magnetic component is fixed in the weak area; when the magnetic component is attracted by the magnetic attraction device, at least part of the weak area is separated from the shell along with the magnetic component, forming the opening.

3. The single cell housing member according to claim 2, wherein: A first annular groove is provided around the first area of ​​the shell component, and the area circled by the first annular groove is a weak area.

4. The single cell housing member according to claim 2, wherein: A first through hole penetrating the inner cavity of the shell is formed on the first area of ​​the shell component, and a sealing member is fixed at the first through hole to seal the first through hole, with the first through hole portion having the sealing member being used as a weak area; The magnetic component is fixed on the sealing component; when the magnetic component is attracted by the magnetic attraction device, at least part of the sealing component is separated from the shell along with the magnetic component, forming the opening.

5. The single cell housing member according to claim 4, characterized in that: The sealing member is a sealing sheet that matches the shape and size of the first through hole, and an annular groove is provided on the outer peripheral surface of the sealing sheet along its circumference; a part of the sealing sheet is located in the first through hole, and the edge of the first through hole is embedded in the annular groove of the sealing sheet.

6. The single cell housing member according to claim 5, wherein: A magnetic component fixing portion is provided on the outer surface of the sealing sheet, and a second annular groove is provided on the outer surface of the sealing sheet along the periphery of the magnetic component fixing portion; the magnetic component is fixed on the magnetic component fixing portion.

7. The single cell housing member according to claim 6, wherein: A third annular groove is provided on the inner surface of the sealing plate. The third annular groove is concentric with the second annular groove and has the same radius as the second annular groove.

8. The single cell housing member according to claim 6, wherein: The magnetic component includes a magnetic attraction portion and a fixing portion; The magnetic component fixing portion is a concave cavity located on the outer surface of the sealing plate, and a blocking portion is provided at the open end of the concave cavity; The magnetic component is located in the concave cavity, with the magnetic attraction portion exposed at the opening end of the concave cavity, and the fixing portion clamped between the bottom of the concave cavity and the blocking portion.

9. The single cell housing member according to claim 8, wherein: The magnetic attraction portion is a circular iron sheet; the fixed portion is at least two ring-shaped iron sheets, and the two ring-shaped iron sheets are symmetrically fixed to the outer peripheral surface of the circular iron sheet relative to the center of the circular iron sheet; The concave cavity is a cylindrical cavity, and its radius is larger than the maximum radius of the magnetic component; the blocking part is two annular fan-shaped baffles symmetrically fixed at the open end of the concave cavity; the inner diameter of the annular fan-shaped baffle is larger than the outer diameter of the magnetic attraction part, and the shape of the open end of the concave cavity with the two annular fan-shaped baffles is adapted to the shape of the magnetic component.

10. The single cell housing member according to claim 9, characterized in that: A limiting platform extending toward the bottom of the cavity is provided at the first end of the annular sector baffle, and an inclined surface inclined toward the bottom of the cavity is provided at the second end surface of the annular sector baffle.

11. The single cell housing member according to claim 10, characterized in that: A limiting groove is provided on the annular fan-shaped baffle; a limiting protrusion is provided on the annular fan-shaped iron sheet extending along its thickness direction; The limiting protrusion is inserted into the limiting groove.

12. The single cell housing member according to any one of claims 4 to 11, characterized in that: The seal is a non-metal injection molded part.

13. A single battery, characterized in that: A single cell casing member comprising the single cell casing member according to any one of claims 1 to 12.

Images