Battery cell structure and battery

Abstract

The embodiment of the utility model provides a battery cell structure and a battery, and relates to the technical field of batteries. The battery cell structure comprises a shell main body and a top cover assembly, wherein the top cover assembly comprises a shell cover, a pole, a sealing adhesive film and a connecting piece; the connecting piece is connected with the shell cover, the pole is located in the opening of the shell cover, the sealing adhesive film is bonded between the pole and the connecting piece, and the projection of the shell cover does not coincide with the projection of the pole in the height direction of the battery cell structure, so that the thickness of the top cover assembly located at the connecting part can be reduced, and the height space of the battery occupied by the top cover assembly can be reduced; the capacity of the battery can be improved, and the energy density of the battery is improved.

Description

Technical Field

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

[0002] With the development of electronic products, the demand for battery capacity in devices such as Bluetooth headsets and electronic bracelets is increasing day by day.

[0003] In related technologies, a cylindrical battery includes a casing body and a top cover assembly. The top cover assembly includes a casing cover, terminals, and a sealing film. The casing cover is welded to the top of the casing body, and the sealing film is bonded between the casing cover and the terminals in the height direction of the battery.

[0004] However, the thickness of the top cover assembly at the connection point is relatively large, resulting in low battery energy density. Utility Model Content

[0005] This utility model provides a cell structure and battery to solve the problem that the battery's energy density is low due to the excessive thickness of the top cover assembly at the connection part.

[0006] In a first aspect, embodiments of the present invention provide a battery cell structure, comprising:

[0007] Shell body;

[0008] A top cover assembly, the top cover assembly including a shell cover, an electrode post, a sealing film, and a connector;

[0009] The cover is connected to the housing body, the cover has an opening, the connector is connected to the cover, the pole is located in the opening of the cover, and the sealing film is bonded between the pole and the connector.

[0010] In the height direction of the cell structure, the projection of the casing does not coincide with the projection of the electrode post.

[0011] In one possible implementation, the pole includes a pole body and a boss, the pole body is connected to the edge of the boss, the pole body is located in the opening of the cover, and the sealing film is bonded between the pole body and the connector.

[0012] In one possible implementation, in the height direction of the cell structure, the thickness of the connector is less than the thickness of the casing; and / or,

[0013] In the height direction of the cell structure, the thickness of the electrode body is less than the thickness of the boss; and / or,

[0014] In the height direction of the battery cell structure, the thickness of the connector is less than the thickness of the electrode body.

[0015] In one possible implementation, in the height direction of the cell structure, the sum of the thickness of the connector, the thickness of the sealant film, and the thickness of the casing is less than the thickness of the electrode post.

[0016] In one possible implementation, the device further includes an electrode core disposed inside the housing body, the connector being located on the side of the housing cover facing the electrode core, the positive electrode tab of the electrode core being welded to the boss of the electrode post, and a first insulating element being disposed between the positive electrode tab and the connector.

[0017] In one possible implementation, in the height direction of the cell structure, the top surface of the connector is located on the side of the bottom surface of the electrode post facing away from the electrode core.

[0018] In one possible implementation, the device further includes an electrode core disposed inside the housing body, the connector being located on the side of the housing cover opposite to the electrode core, the positive electrode tab of the electrode core being welded to the electrode post, and the positive electrode tab and the boss being disposed opposite to each other.

[0019] In one possible implementation, a gap exists between the connector and the boss in the radial direction of the pole post.

[0020] In one possible implementation, the projection of the connector in the height direction of the cell structure covers the sidewall of the housing body.

[0021] In one possible implementation, the boss includes a first end and a second end along the axial direction of the pole post, the first end being flush with the pole post body.

[0022] The main body of the shell is provided with a bottom wall and a side wall, the side wall is connected to the bottom wall, and the bottom wall and the side wall form a cavity.

[0023] In one possible implementation, when the first end of the boss faces the cavity, the outer diameter of the cover is equal to the inner diameter of the cavity; or...

[0024] The second end of the boss faces the cavity, and the outer diameter of the shell cover is larger than the inner diameter of the cavity.

[0025] In one possible implementation, the diameter of the boss is 1 mm to 5 mm; and / or,

[0026] In the height direction of the battery cell structure, the thickness of the boss is 0.1mm to 0.5mm; and / or,

[0027] The thickness of the cover is 0.1mm to 0.3mm, and the cover is made of stainless steel; and / or,

[0028] The thickness of the connector is 0.01mm to 0.08mm, and the connector is a nickel sheet or a nickel-plated stainless steel sheet; and / or,

[0029] The thickness of the connecting portion of the top cover assembly is 0.2mm to 0.3mm; and / or,

[0030] The thickness of the adhesive portion of the sealant film is 0.02 mm to 0.06 mm; and / or,

[0031] The maximum thickness of the pole is 0.1mm to 0.2mm.

[0032] In one possible implementation, in the height direction of the cell structure, the projection of the solder joint between the connector and the cover does not coincide with the projection of the solder joint between the cover and the housing body.

[0033] In one possible implementation, the sealant film includes an overflow portion, an adhesive portion, and an inner overflow portion. In the radial direction of the sealant film, the overflow portion is connected to the outer edge of the adhesive portion, and the inner overflow portion is connected to the inner edge of the adhesive portion; and / or,

[0034] The thickness of both the overflow portion and the inner overflow portion is greater than the thickness of the adhesive portion.

[0035] In one possible implementation, a sealing cap is also included, wherein the boss is provided with an injection hole that penetrates the boss, and the sealing cap is connected to the boss to block the injection hole; and / or,

[0036] The axis of the injection hole coincides with the axis of the electrode post; and / or,

[0037] The diameter of the injection hole is 0.6 mm to 2 mm.

[0038] In one possible implementation, a positive electrode connector is also included;

[0039] In the height direction of the cell structure, the positive electrode pin of the positive electrode connector is located on the side of the electrode post away from the main body of the housing; or, in the radial direction of the electrode post, the positive electrode pin of the positive electrode connector is located on one side of the side wall of the main body of the housing.

[0040] In one possible implementation, the sealing cap is a sealing sheet with a thickness of 0.05 mm to 0.15 mm; and / or,

[0041] The positive electrode connecting piece is welded to the electrode post, and in the height direction of the cell structure, the projection of the welding area of ​​the positive electrode connecting piece does not coincide with the projection of the sealing piece; and / or,

[0042] The projection of the welding area of ​​the positive electrode connector does not coincide with the projection of the sealant film.

[0043] In one possible implementation, the sealing cap includes a sealing piece and a limiting platform, the limiting platform being disposed on the sealing piece and facing the cavity of the housing body, the limiting platform being inserted into the injection hole;

[0044] The positive electrode connecting piece is welded to the sealing piece.

[0045] In one possible implementation, a negative electrode connecting piece is further included. The negative electrode connecting piece is welded to the shell cover or connector. The negative electrode pin of the negative electrode connecting piece is located on the side of the electrode post away from the main body of the shell. The projection of the welding area of ​​the negative electrode connecting piece does not coincide with the projection of the sealing film. A second insulating element is provided between the positive electrode connecting piece and the connector.

[0046] In one possible implementation, the projection of the welding area of ​​the negative electrode connector does not coincide with the projection of the sealant film.

[0047] In one possible implementation, a negative electrode connecting piece is also included, which is welded to the bottom wall of the housing body.

[0048] In one possible implementation, the thickness of the welding area of ​​the negative electrode connector is less than the thickness of other areas of the negative electrode connector.

[0049] Secondly, this utility model provides a battery, including the cell structure described above.

[0050] The battery cell structure and battery provided in this embodiment of the utility model include a top cover assembly with a connector that connects to the casing. The terminal post is located in the opening of the casing, and a sealing film is bonded between the terminal post and the connector. In the height direction of the battery cell structure, the projection of the casing and the projection of the terminal post do not coincide. That is, the casing and the terminal post are arranged in a roughly horizontal manner, thereby avoiding the excessive thickness of the top cover assembly caused by the overlapping projections of the casing and the terminal post. This reduces the thickness of the top cover assembly at the connection part, which in turn reduces the thickness of the top cover assembly at the connection part of the terminal post, sealing film, casing, and connector. This reduces the height space occupied by the top cover assembly in the battery, thereby increasing the battery capacity and improving the battery's energy density. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of a battery cell structure provided in Embodiment 1 of the present utility model;

[0053] Figure 2 for Figure 1 A schematic diagram of the cross-section of the battery cell structure after removing the positive and negative electrode connecting pieces;

[0054] Figure 3 A cross-sectional schematic diagram of the top cover assembly provided in Embodiment 1 of this utility model;

[0055] Figure 4 for Figure 3 An exploded view of the top cover assembly;

[0056] Figure 5 for Figure 3 A schematic diagram of the structure of the sealant film in the middle;

[0057] Figure 6 for Figure 1 A schematic diagram of the cross-section of the battery cell structure after removing the electrode core and the first insulating component;

[0058] Figure 7 for Figure 3 A schematic diagram of the pole structure in the diagram;

[0059] Figure 8 for Figure 1 A top view of the battery cell structure;

[0060] Figure 9 This is a schematic diagram showing the connection between the shell body, the top cover assembly, and the sealing cap provided in Embodiment 2 of this utility model;

[0061] Figure 10 This is a schematic diagram of a battery cell structure provided in Embodiment 3 of this utility model;

[0062] Figure 11 for Figure 10 A schematic diagram of the cross-section of the battery cell structure after removing the electrode core;

[0063] Figure 12 for Figure 10 A schematic diagram of the sealing cap structure;

[0064] Figure 13This is a schematic diagram of a battery cell structure provided in Embodiment 4 of the present invention;

[0065] Figure 14 for Figure 13 A top view of the battery cell structure.

[0066] Explanation of reference numerals in the attached figures:

[0067] 10-Shell body; 101-Bottom wall;

[0068] 102 - Sidewall; 20 - Sheath;

[0069] 201 - Opening; 30 - Pole post;

[0070] 31-Pole post body; 32-Boss;

[0071] 321 - First end; 322 - Second end;

[0072] 323 - Injection hole; 40 - Connector;

[0073] 50 - Sealant film; 501 - Overflow portion;

[0074] 502 - Adhesive portion; 503 - Inner overflow portion;

[0075] 60 - Core electrode; 601 - Positive electrode tab;

[0076] 70 - Sealing cap; 71 - Sealing piece;

[0077] 72 - Limiting stage; 80 - Positive electrode connector;

[0078] 801 - Positive pin; 90 - Negative connector;

[0079] 901 - Negative pin; 91 - First insulating component;

[0080] 92 - Second insulating component. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0082] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0084] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0085] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] In related technologies, the thickness of the top cover assembly at the connection point is relatively large, resulting in low battery energy density. Research by the inventors has revealed that this problem arises because, along the battery's height, the sealing film is bonded between the casing and the terminals. The thickness of the top cover assembly at the connection point is the thickness of the portion where the top cover assembly connects to the terminals, sealing film, and casing. This thickness results in the top cover assembly occupying a large amount of vertical space within the battery, reducing battery capacity and leading to low energy density.

[0087] To address the aforementioned issues, the battery cell structure and battery provided in this embodiment of the present invention are connected to the casing via a connector, with a sealing film bonded between the terminals and the connector. In the height direction of the battery cell structure, the projection of the casing does not coincide with the projection of the terminals. Compared to the thickness of the top cover assembly in the related art at the connection point of the terminals, sealing film, and casing, the thickness of the top cover assembly at this connection point is smaller. This reduces the vertical space occupied by the top cover assembly in the battery, thereby increasing the battery capacity and, consequently, improving the battery's energy density.

[0088] The cell structure and battery provided in this utility model embodiment will be described in detail below with reference to specific embodiments.

[0089] Example 1

[0090] See Figure 1 As shown, this embodiment of the invention provides a cell structure for use in a battery. The height direction of the cell structure is the Z-axis direction.

[0091] The cell structure includes a housing body 10. The housing body 10 is cylindrical. In some examples, the housing body 10 is cylindrical.

[0092] See Figure 2 As shown, the housing body 10 contains the electrode core 60. Specifically, the housing body 10 is provided with a bottom wall 101 and a side wall 102. The side wall 102 is connected to the bottom wall 101. The bottom wall 101 and the side wall 102 form a cavity. The cavity is cylindrical, and the electrode core 60 is contained in the cavity.

[0093] See Figure 3 and Figure 4 As shown, the cell structure includes a top cover assembly. The top cover assembly includes a housing cover 20. In some examples, the housing cover 20 is cylindrical.

[0094] The cover 20 is connected to the housing body 10. Exemplarily, the cover 20 is welded to the housing body 10 to achieve a sealed connection between the cover 20 and the housing body 10.

[0095] The cover 20 is made of metal. In some examples, the cover 20 is a stainless steel cover.

[0096] The thickness of the cover 20 is the thickness of the cover 20 in the height direction of the cell structure. In some examples, the thickness of the cover 20 can be 0.1mm to 0.3mm, that is, the thickness of the cover 20 is greater than or equal to 0.1mm and less than or equal to 0.3mm.

[0097] The cover 20 has an opening 201. The opening 201 is circular in shape. The center of the opening 201 is located on the axis of the cover 20.

[0098] The top cover assembly also includes a pole post 30. The pole post 30 may be cylindrical.

[0099] The terminal post 30 is located in the opening 201 of the housing 20. At the height of the cell structure, the terminal post 30 is located on one side of the cell core 60.

[0100] The top cover assembly also includes a connector 40. The connector 40 may be annular. In some examples, the axis of the connector 40 coincides with the axis of the cover 20.

[0101] The connector 40 is connected to the housing cover 20. Exemplarily, the connector 40 is welded to the housing cover 20 to achieve a sealed connection. In the height direction of the cell structure, the projection of the solder joint between the connector 40 and the housing cover 20 does not coincide with the projection of the solder joint between the housing cover 20 and the housing body 10. This arrangement prevents interference between the two solder joints and also prevents problems such as incomplete or missing solder joints.

[0102] The connector 40 is made of metal. In some examples, the connector 40 may be a nickel sheet or a nickel-plated stainless steel sheet.

[0103] The thickness of connector 40 is equal to its thickness along the height of the cell structure. In some examples, the thickness of connector 40 can be 0.01mm to 0.08mm, meaning it is greater than or equal to 0.01mm and less than or equal to 0.08mm. When the thickness of connector 40 is less than 0.01mm, it is prone to deformation due to heat during welding, leading to poor sealing between connector 40 and cover 20 and increasing the risk of leakage. When the thickness of connector 40 is greater than 0.08mm, the material usage of connector 40 increases, resulting in increased production costs. By ensuring the thickness of connector 40 is greater than or equal to 0.01mm and less than or equal to 0.08mm, connector 40 is less prone to deformation due to heat during welding, reducing the risk of leakage, and the material usage of connector 40 is reduced, thus lowering production costs.

[0104] The top cover assembly also includes a sealing film 50. The sealing film 50 is made of an insulating material.

[0105] The inner diameter of connector 40 is smaller than the diameter of opening 201. In the height direction of the cell structure, the projection of pole 30 overlaps with the projection of connector 40.

[0106] The sealing film 50 is bonded between the pole 30 and the connector 40. This arrangement allows the sealing film 50 to seal between the pole 30 and the connector 40, thereby sealing the opening 201 of the cover 20.

[0107] The sealing film 50 can be bonded between the pole post 30 and the connector 40 by hot pressing.

[0108] In some examples, the thickness of the sealant film 50 before hot pressing can be 0.08 mm to 0.2 mm, that is, the thickness of the sealant film 50 before hot pressing is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

[0109] The sealant film 50 will soften during the hot pressing process. See also Figure 5 As shown, the sealant film 50 cures and solidifies after hot pressing, and the sealant film 50 can be annular. In some examples, the axis of the sealant film 50 coincides with the axis of the cover 20.

[0110] exist Figure 5 In the direction from left to right, the portion between the first and second dashed lines and the portion between the third and fourth dashed lines is the adhesive portion 502, the portion between the second and third dashed lines is the overflow portion 503, and the portion to the left of the first dashed line and the portion to the right of the fourth dashed line is the overflow portion 501.

[0111] See Figure 5 As shown, the sealant film 50 includes an overflow portion 501, an adhesive portion 502, and an inner overflow portion 503. In the radial direction of the sealant film 50, the overflow portion 501 is connected to the outer edge of the adhesive portion 502, and the inner overflow portion 503 is connected to the inner edge of the adhesive portion 502. See also... Figure 5 and Figure 6 As shown, in the height direction of the cell structure, the adhesive portion 502 is located between the electrode post 30 and the connector 40. The overflow portion 501 and the inner overflow portion 503 are the portions of the sealant film 50 that overflow from between the electrode post 30 and the connector 40 during the hot pressing process.

[0112] The thickness H1 of the overflow portion 501 is the thickness of the overflow portion 501 in the height direction of the cell structure. The thickness H3 of the inner overflow portion 503 is the thickness of the inner overflow portion 503 in the height direction of the cell structure. The thickness H2 of the adhesive portion 502 is the thickness of the adhesive portion 502 in the height direction of the cell structure.

[0113] In some examples, the thickness H1 of the overflow portion 501 and the thickness H3 of the inflow portion 503 are both greater than the thickness H2 of the adhesive portion 502. The thickness H2 of the adhesive portion 502 is greater than or equal to 1 / 5 of the thickness of the sealant film 50 before hot pressing, and less than or equal to 4 / 5 of the thickness of the sealant film 50 before hot pressing. When the thickness H2 of the adhesive portion 502 is less than 1 / 5 of the thickness of the sealant film 50 before hot pressing, the adhesive portion 502 is too thin and cannot provide sufficient adhesive strength, causing the pole 30 to easily separate from the connector 40. When the thickness H2 of the adhesive portion 502 is greater than 4 / 5 of the thickness of the sealant film 50 before hot pressing, the adhesive portion 502 is too thick, and the adhesive portion 502 is prone to incomplete curing, resulting in a decrease in the adhesive strength of the adhesive portion 502. By ensuring that the thickness H2 of the adhesive portion 502 is greater than or equal to 1 / 5 of the thickness of the sealant film 50 before hot pressing, and the thickness H2 of the adhesive portion 502 is less than or equal to 4 / 5 of the thickness of the sealant film 50 before hot pressing, the adhesive portion 502 is fully cured, which can improve the bonding strength of the adhesive portion 502 and make it difficult for the pole post 30 and the connector 40 to separate.

[0114] The positive electrode tab 601 of the core 60 (see...) Figure 2 (As shown) can be electrically connected to the pole post 30; the negative tab of the pole core 60 can be electrically connected to the housing body 10 or the housing cover 20.

[0115] In the height direction of the cell structure, the projection of the casing 20 does not coincide with the projection of the terminal post 30. This arrangement means that the casing and terminal post are arranged roughly horizontally, thus avoiding excessive thickness of the top cover assembly caused by overlapping projections of the casing and terminal post. This reduces the thickness of the top cover assembly at the connection point, specifically at the connection between the terminal post 30, the sealing film 50, the casing 20, and the connector 40. Consequently, it reduces the height space occupied by the top cover assembly in the battery, thereby increasing the battery capacity and energy density.

[0116] It should be noted that the thickness of the top cover assembly at the connection point of the terminal post 30, sealing film 50, housing cover 20, and connector 40 can be equal to the thickness H of the connection point of the top cover assembly. The thickness H of the connection point of the top cover assembly can be equal to the thickness of the connection point between the housing cover 20 and connector 40 in the height direction of the cell structure. Alternatively, the thickness H of the connection point of the top cover assembly can also be equal to the thickness of the connection point of the terminal post 30, sealing film 50, and connector 40.

[0117] In one possible implementation, the thickness H of the connecting portion of the top cover assembly can be 0.2mm to 0.3mm, that is, the thickness H of the connecting portion of the top cover assembly is greater than or equal to 0.2mm and less than or equal to 0.3mm. The thickness of the shell cover 20 can be 0.15mm to 0.25mm, that is, the thickness of the shell cover 20 is greater than or equal to 0.15mm and less than or equal to 0.25mm. The thickness of the connector 40 can be 0.035mm to 0.075mm, that is, the thickness of the connector 40 is greater than or equal to 0.035mm and less than or equal to 0.075mm. The thickness of the adhesive portion 502 of the sealing film 50 can be 0.02mm to 0.06mm, that is, the thickness of the adhesive portion 502 of the sealing film 50 is greater than or equal to 0.02mm and less than or equal to 0.06mm. The maximum thickness of the pole post 30 can be 0.1mm to 0.2mm, that is, the maximum thickness of the pole post 30 is greater than or equal to 0.1mm and less than or equal to 0.2mm.

[0118] For example, the thickness H of the connecting portion of the top cover assembly can be 0.2mm to 0.3mm, that is, the thickness H of the connecting portion of the top cover assembly is greater than or equal to 0.2mm and less than or equal to 0.3mm. The thickness of the shell cover 20 can be 0.15mm. The thickness of the connector 40 can be 0.05mm. The thickness of the adhesive portion 502 of the sealing film 50 can be 0.05mm. The maximum thickness of the pole 30 can be 0.1mm.

[0119] In one possible implementation, see Figure 7 As shown, the pole post 30 includes a pole post body 31 and a boss 32. In some examples, the pole post body 31 and the boss 32 are integrally formed. The pole post body 31 is annular, and the boss 32 is cylindrical.

[0120] exist Figure 7 The portion between the two dotted lines is boss 32. Figure 7 The remaining part after removing the boss 32 is the pole body 31.

[0121] The pole body 31 is connected to the edge of the boss 32. The inner diameter of the pole body 31 is equal to the diameter of the boss 32. The diameter of the boss 32 is smaller than the inner diameter of the connector 40.

[0122] The axis of the terminal post 30 extends along the height direction of the cell structure. In the axial direction of the terminal post 30, one end of the terminal post body 31 is aligned with one end of the boss 32.

[0123] The thickness H4 of the electrode body 31 is the thickness of the electrode body 31 in the height direction of the cell structure. The thickness H5 of the boss 32 is the thickness of the boss 32 in the height direction of the cell structure. The thickness H4 of the electrode body 31 is less than the thickness H5 of the boss 32. It can be understood that the maximum thickness of the electrode 30 is equal to the thickness H5 of the boss 32.

[0124] The connection between the electrode post 30 and the sealing film 50 is the electrode post body 31. The electrode post body 31 is located in the opening 201 of the housing cover 20. The sealing film 50 is bonded between the electrode post body 31 and the connector 40.

[0125] In the height direction of the cell structure, the thickness of the connector 40 is less than the thickness of the shell cover 20, and the thickness of the connector 40 is less than the thickness of the terminal body 31. With this configuration, when the thickness H of the connecting portion of the top cover assembly is equal to the thickness of the portion where the connector 40 connects to the shell cover 20, the thickness H of the connecting portion of the top cover assembly is less than the thickness of the portion where the top cover assembly connects to the terminal, sealing film, and shell cover in related technologies. This reduces the thickness H of the connecting portion of the top cover assembly, thereby reducing the height space occupied by the top cover assembly in the battery, increasing the battery capacity, and improving the battery's energy density.

[0126] When the thickness H of the connecting part of the top cover assembly is equal to the thickness of the part where the connector 40, the sealing film 50 and the electrode body 31 are connected, the thickness H of the connecting part of the top cover assembly is less than the thickness of the part where the top cover assembly, the sealing film and the shell cover are connected in the related technology. This can reduce the thickness H of the connecting part of the top cover assembly, thereby reducing the height space occupied by the top cover assembly in the battery, which can increase the battery capacity and improve the battery energy density.

[0127] In one possible implementation, the sum of the thicknesses of the connector 40, the sealing film, and the casing 20 in the height direction of the cell structure is less than the thickness of the terminal post 30. This arrangement prevents the connector 40 from interfering with the connection between the terminal post 30 and the positive electrode tab 601. Additionally, it avoids the cell structure from becoming too thick overall, which could affect energy density.

[0128] In one possible implementation, there is a gap between the electrode body 31 and the housing cover 20 in the radial direction of the electrode 30. This arrangement prevents the electrode body 31 from contacting the housing cover 20, thereby preventing a short circuit between the positive tab 601 and the negative tab of the electrode core 60.

[0129] In the radial direction of the terminal post 30, there is a gap between the connector 40 and the boss 32. With this arrangement, a glue reservoir can be formed between the connector 40 and the boss 32. The glue reservoir can store the glue that overflows from the sealing film 50 during the hot pressing process, preventing the overflowing glue from affecting the flatness of the cell structure.

[0130] In one possible implementation, see Figure 7 As shown, along the axial direction of the pole post 30, the boss 32 includes a first end 321 and a second end 322. The first end 321 is flush with the pole post body 31.

[0131] See Figure 6 and Figure 7 As shown, the second end 322 of the boss 32 can face the cavity of the housing body 10. The outer diameter of the cover 20 is larger than the inner diameter of the cavity. This arrangement allows the cover 20 to be connected to the top of the housing body 10.

[0132] See Figure 7 As shown, the boss 32 is provided with an injection hole 323, which penetrates the boss 32. Electrolyte can be injected into the cavity of the housing body 10 through the injection hole 323.

[0133] The injection port 323 can be cylindrical. The axis of the injection port 323 extends along the axial direction of the pole post 30. In some examples, the axis of the injection port 323, the axis of the pole post body 31, and the axis of the boss 32 coincide, that is, the axis of the injection port 323 and the axis of the pole post 30 coincide.

[0134] The cell structure includes a sealing cap 70 (see...) Figure 1 and Figure 2 (As shown). The sealing cap 70 is made of metal.

[0135] The sealing cap 70 is attached to the boss 32. In some examples, the sealing cap 70 is attached to the boss 32 by laser welding.

[0136] The sealing cap 70 seals the injection hole 323 to prevent the electrolyte inside the shell body 10 from leaking out of the injection hole 323.

[0137] The diameter of the injection hole 323 can be between 0.6mm and 2mm, meaning it must be greater than or equal to 0.6mm and less than or equal to 2mm. When the diameter of the injection hole 323 is less than 0.6mm, the injection flow rate is slow, resulting in low injection efficiency. When the diameter of the injection hole 323 is greater than 2mm, the sealing difficulty of the injection hole 323 increases. By using a diameter of 0.6mm or greater and less than or equal to 2mm, the injection flow rate can be increased, improving injection efficiency, and the sealing difficulty of the injection hole 323 can be reduced.

[0138] In some examples, the sealing cap 70 can be a sealing sheet. The thickness of the sealing sheet is the thickness of the sealing sheet in the height direction of the cell structure.

[0139] The thickness of the sealing sheet can range from 0.05mm to 0.15mm, meaning it must be greater than or equal to 0.05mm and less than or equal to 0.15mm. When the thickness is less than 0.05mm, the sealing sheet is prone to deformation due to heat during welding, leading to poor sealing of the injection hole and increasing the risk of leakage. When the thickness is greater than 0.15mm, the material usage increases, resulting in higher production costs. By maintaining a thickness of 0.05mm to 0.15mm, the sealing sheet is less prone to deformation due to heat during welding, reducing the risk of leakage and decreasing material usage, thus lowering production costs.

[0140] In one possible implementation, the connector 40 is located on the side of the housing 20 facing the pole core 60 (see [link]). Figure 2 (As shown).

[0141] The positive tab 601 of the electrode core 60 is welded to the boss 32 of the electrode post 30. Specifically, the positive tab 601 of the electrode core 60 is welded to the second end 322 of the boss 32.

[0142] A first insulating element 91 is provided between the positive electrode tab 601 and the connector 40 (see...). Figure 2 (As shown). This configuration prevents the positive tab 601 from contacting the connector 40, thereby preventing a short circuit between the positive tab 601 and the negative tab of the electrode core 60.

[0143] The first insulating element 91 is made of an insulating material. In some examples, the first insulating element 91 may be polyimide tape or polyethylene terephthalate (PET) tape.

[0144] In one possible implementation, in the height direction of the cell structure, the top surface of the connector 40 is located on the side of the bottom surface of the terminal post 30 facing away from the electrode core 60. This arrangement prevents the connector 40 from interfering with the welding of the terminal post 30 and the positive electrode tab 601.

[0145] In the height direction of the cell structure, the surface of the connector 40 facing away from the electrode core 60 is the top surface of the connector 40.

[0146] In the height direction of the cell structure, the side of the pole post 30 facing the pole core 60 is the bottom surface of the pole post 30.

[0147] For example, the top surface of the connector 40 is located on the side of the bottom surface of the boss 32 of the pole post 30 away from the pole core 60.

[0148] In one possible implementation, the cell structure further includes a positive electrode connector 80 (see...). Figure 1 (As shown).

[0149] The positive electrode connector 80 is welded to the terminal post 30. In some examples, the positive electrode connector 80 is welded to the first end 321 of the boss 32 of the terminal post 30.

[0150] In some examples, the diameter of the boss 32 can be 1mm to 5mm, meaning the diameter of the boss 32 is greater than or equal to 1mm and less than or equal to 5mm. When the diameter of the boss 32 is less than 1mm, the welding area between the positive electrode connector 80 and the terminal post 30 is small, resulting in poor connection stability between the positive electrode connector 80 and the terminal post 30. When the diameter of the boss 32 is greater than 5mm, the material usage of the terminal post 30 increases, leading to increased production costs. By using a diameter of the boss 32 that is greater than or equal to 1mm and less than or equal to 5mm, the welding area between the positive electrode connector 80 and the terminal post 30 can be increased, improving the connection stability between the positive electrode connector 80 and the terminal post 30, and reducing the material usage of the terminal post 30, thus lowering production costs.

[0151] In the height direction of the cell structure, the thickness of the boss 32 can be 0.1mm to 0.5mm, meaning the thickness of the boss 32 is greater than or equal to 0.1mm and less than or equal to 0.5mm. When the thickness of the boss 32 is less than 0.1mm, it is prone to burn-through during welding. When the thickness of the boss 32 is greater than 0.5mm, it increases the material usage of the electrode post 30, leading to increased production costs. By ensuring the thickness of the boss 32 is greater than or equal to 0.1mm and less than or equal to 0.5mm, it is less likely to burn-through during welding, reducing the material usage of the electrode post 30 and lowering production costs.

[0152] The end of the positive terminal connector 80 that does not contact the terminal post 30 is the positive terminal pin 801 (see [link]). Figure 1 , Figure 6 and Figure 8 (As shown).

[0153] See Figure 8 As shown, in the radial direction of the terminal post 30, the positive terminal pin 801 of the positive terminal connector 80 is located on one side of the side wall 102 of the housing body 10. With this configuration, in the radial direction of the terminal post 30, the battery can supply power to the outside from one side of the side wall 102 of the housing body 10.

[0154] In the height direction of the cell structure, the projection of the welding area of ​​the positive electrode connector 80 does not coincide with the projection of the sealing plate, nor does it coincide with the projection of the sealing film 50. This design prevents the welding area of ​​the positive electrode connector 80 from being located in the area corresponding to the sealing plate and the injection hole 323, thus avoiding burn-through of the sealing plate. It also prevents the sealing film 50 from melting easily during the welding process of the positive electrode connector 80.

[0155] It should be noted that the welding area between the positive electrode connecting piece 80 and the electrode post 30 is the welding area of ​​the positive electrode connecting piece 80.

[0156] In one possible implementation, the cell structure further includes a negative electrode connector 90 (see...). Figure 1 and Figure 6 (As shown).

[0157] The negative electrode connecting piece 90 is welded to the bottom wall 101 of the housing body 10. The end of the negative electrode connecting piece 90 that does not contact the housing body 10 is the negative electrode pin 901. For example, the thickness of the housing body 10 is greater than or equal to 1.5 mm, that is, the thickness of both the side wall 102 and the bottom wall 101 of the housing body 10 is greater than or equal to 1.5 mm.

[0158] In some examples, the positive pin 801 of the positive terminal connector 80 and the negative pin 901 of the negative terminal connector 90 are located on one side of the sidewall 102 of the housing body 10 in the radial direction of the terminal 30.

[0159] Example 2

[0160] See Figure 9 As shown, the difference between the battery cell structure in Embodiment 2 and the battery cell structure in Embodiment 1 is that the first end 321 of the boss 32 faces the cavity, and the outer diameter of the cover 20 is less than or equal to the inner diameter of the cavity. This arrangement allows the cover 20 to be connected to the inner wall of the cavity of the housing body 10.

[0161] The connector 40 is located on the side of the housing 20 opposite to the electrode core 60. The cell structure does not have a first insulating element 91.

[0162] The positive tab 601 of the electrode core 60 is welded to the electrode post 30. The positive tab 601 and the boss 32 are arranged opposite to each other.

[0163] In the height direction of the cell structure, the projection of the connector 40 covers the side wall 102 of the housing body 10.

[0164] The remaining structures of the cell structure in Example 2 are the same as those in Example 1.

[0165] Example 3

[0166] See Figures 10 to 12 As shown, the cell structure in Embodiment 3 differs from that in Embodiment 2 in that the sealing cap 70 includes a sealing piece 71 and a limiting platform 72. The limiting platform 72 is disposed on the sealing piece 71, facing the cavity of the housing body 10, and is inserted into the injection hole 323. This arrangement restricts the position of the sealing cap 70 on the electrode post 30, thereby facilitating the positioning of the sealing cap 70 during welding to the electrode post 30.

[0167] The positive electrode connecting piece 80 is welded to the sealing piece 71. Specifically, in the height direction of the cell structure, the area where the sealing piece 71 overlaps with the limiting platform 72 is the first region of the sealing piece 71. This means that, in the height direction of the cell structure, the projection of the first region of the sealing piece 71 coincides with the projection of the limiting platform 72. The positive electrode connecting piece 80 is welded to the first region of the sealing piece 71. This arrangement, when welding the positive electrode connecting piece 80 and the sealing cap 70, makes it less likely for the sealing cap 70 to be welded through by welding the positive electrode connecting piece 80 to the area where the sealing piece 71 overlaps with the limiting platform 72.

[0168] The thickness of the housing body 10 is less than 1.5 mm, meaning that the thickness of both the bottom wall 101 and the side wall 102 of the housing body 10 is less than 1.5 mm. In some examples, the bottom wall 101 of the housing body 10 is welded to the negative electrode connecting piece 90, and the thickness of the welding area of ​​the negative electrode connecting piece 90 is less than the thickness of other areas of the negative electrode connecting piece 90. With this configuration, during the welding process between the bottom wall 101 of the housing body 10 and the negative electrode connecting piece 90, by reducing the thickness of the welding area of ​​the negative electrode connecting piece 90, the bottom wall 101 of the housing body 10 is less likely to be welded through.

[0169] It should be noted that the welding area between the negative electrode connecting piece 90 and the bottom wall 101 of the housing body 10 is the welding area of ​​the negative electrode connecting piece 90. The other areas of the negative electrode connecting piece 90 are the areas remaining after removing the welding area.

[0170] The remaining structures of the cell structure in Example 3 are the same as those in Example 2.

[0171] Example 4

[0172] See Figure 13 and Figure 14 As shown, the difference between the cell structure in Embodiment 4 and the cell structure in Embodiment 2 is that, in the height direction of the cell structure, the positive electrode pin 801 of the positive electrode connecting piece 80 and the negative electrode pin 901 of the negative electrode connecting piece 90 are located on the side of the electrode post away from the housing body 10.

[0173] The negative electrode connecting piece 90 can be welded to the connector 40. In other embodiments, the negative electrode connecting piece 90 can also be welded to the housing cover 20.

[0174] In the height direction of the battery cell structure, the projection of the welding area of ​​the negative electrode connector 90 does not coincide with the projection of the sealant film. This design prevents the sealant film 50 from melting during the welding process of the negative electrode connector 90.

[0175] A second insulating element 92 is provided between the positive electrode connecting piece 80 and the connector 40. This arrangement can prevent the positive electrode connecting piece 80 from contacting the connector 40, thereby preventing a short circuit between the positive electrode tab 601 and the negative electrode tab of the electrode core 60.

[0176] The second insulating element 92 is made of an insulating material. In some examples, the second insulating element 92 may be polyimide tape or polyethylene terephthalate (PET) tape.

[0177] The remaining structures of the cell structure in Example 4 are the same as those in Example 2.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric cell structure, characterized by comprising: Comprise: A shell body (10); A top cover assembly comprising a shell cover (20), a pole (30), a sealing rubber film (50) and a connecting piece (40); The shell cover (20) is connected with the shell body (10), the shell cover (20) is provided with an opening (201), the connecting piece (40) is connected with the shell cover (20), the pole (30) is located in the opening (201) of the shell cover (20), and the sealing rubber film (50) is bonded between the pole (30) and the connecting piece (40); In the height direction of the battery cell structure, the projection of the shell cover (20) does not coincide with the projection of the pole (30).

2. The cell structure of claim 1, wherein, The pole (30) comprises a pole body (31) and a boss (32), the pole body (31) is connected with the edge of the boss (32), the pole body (31) is located in the opening (201) of the shell cover (20), and the sealing rubber film (50) is bonded between the pole body (31) and the connecting piece (40).

3. The cell structure of claim 2, wherein, In the height direction of the battery cell structure, the thickness of the connecting piece (40) is less than the thickness of the shell cover (20); and / or, In the height direction of the battery cell structure, the thickness of the pole body (31) is less than the thickness of the boss (32); and / or, In the height direction of the battery cell structure, the thickness of the connecting piece (40) is less than the thickness of the pole body (31).

4. The cell structure of claim 2, wherein, In the height direction of the battery cell structure, the sum of the thickness of the connecting piece (40), the sealing rubber film (50) and the shell cover (20) is less than the thickness of the pole (30).

5. The cell structure of claim 2, wherein, Further comprising a pole core (60), the pole core (60) is arranged inside the shell body (10), the connecting piece (40) is located on the side of the shell cover (20) facing the pole core (60), the positive tab (601) of the pole core (60) is welded with the boss (32) of the pole (30), and the first insulating piece (91) is arranged between the positive tab (601) and the connecting piece (40).

6. The cell structure of claim 5, wherein, In the height direction of the battery cell structure, the top surface of the connecting piece (40) is located on the side away from the pole core (60) of the bottom surface of the pole (30).

7. The cell structure of claim 2, wherein, Further comprising a pole core (60), the pole core (60) is arranged inside the shell body (10), the connecting piece (40) is located on the side of the shell cover (20) away from the pole core (60), the positive tab (601) of the pole core (60) is welded with the pole (30), and the positive tab (601) and the boss (32) are arranged oppositely.

8. The cell structure of claim 7, wherein, In the radial direction of the pole (30), there is a gap between the connecting piece (40) and the boss (32).

9. The cell structure of claim 7, wherein, In the height direction of the battery cell structure, the projection of the connecting piece (40) covers the side wall of the shell body (10).

10. The cell structure of claim 2, wherein, In the axial direction of the pole (30), the boss (32) comprises a first end (321) and a second end (322), the first end (321) is flush with the pole body (31); The shell body (10) is provided with a bottom wall (101) and a side wall (102), the side wall (102) is connected with the bottom wall (101), and the bottom wall (101) and the side wall (102) enclose a cavity.

11. The cell structure of claim 10, wherein, The first end (321) of the boss (32) faces the cavity, and the outer diameter of the shell cover (20) is less than or equal to the inner diameter of the cavity; or, The second end (322) of the boss (32) faces the cavity, and the outer diameter of the shell cover (20) is greater than the inner diameter of the cavity.

12. The cell structure of claim 2, wherein, The diameter of the boss (32) is 1mm-5mm; and / or, In the height direction of the battery cell structure, the thickness of the boss (32) is 0.1mm-0.5mm; and / or, The thickness of the shell cover (20) is 0.1mm-0.3mm, and the shell cover (20) is a stainless steel cover; and / or, The thickness of the connecting piece (40) is 0.01mm-0.08mm, and the connecting piece (40) is a nickel sheet or a stainless steel sheet plated with nickel; and / or, The thickness of the connecting part of the top cover assembly is 0.2mm-0.3mm; and / or, The thickness of the adhesive part (502) of the sealing rubber film (50) is 0.02mm-0.06mm; and / or, The maximum thickness of the pole (30) is 0.1mm-0.2mm.

13. The cell structure of any one of claims 1-12, wherein, In the height direction of the battery cell structure, the projection of the welding mark between the connecting piece (40) and the shell cover (20) does not coincide with the projection of the welding mark between the shell cover (20) and the shell body (10).

14. The cell structure of any one of claims 1-12, wherein, The sealing rubber film (50) comprises an overflow part (501), an adhesive part (502) and an inner overflow part (503), in the radial direction of the sealing rubber film (50), the overflow part (501) is connected with the outer edge of the adhesive part (502), and the inner overflow part (503) is connected with the inner edge of the adhesive part (502); and / or, The thickness of the overflow part (501) and the thickness of the inner overflow part (503) are both greater than the thickness of the adhesive part (502).

15. The cell structure of any of claims 2-12, wherein, Further comprising a sealing cover (70), the boss (32) is provided with a liquid injection hole (323) penetrating through the boss (32), the sealing cover (70) is connected on the boss (32), and the sealing cover (70) blocks the liquid injection hole (323); and / or, The axis of the liquid injection hole (323) coincides with the axis of the pole (30); and / or, The diameter of the liquid injection hole (323) is 0.6mm-2mm.

16. The cell structure of claim 15, wherein, Further comprising a positive electrode connecting piece (80); In the height direction of the battery cell structure, the positive electrode pin (801) of the positive electrode connecting piece (80) is located on the side of the pole (30) away from the shell body (10); or, in the radial direction of the pole (30), the positive electrode pin (801) of the positive electrode connecting piece (80) is located on one side of the side wall (102) of the shell body (10).

17. The cell structure of claim 16, wherein, The positive electrode connecting piece (80) is welded with the pole column (30), and the projection of the welding area of the positive electrode connecting piece (80) does not coincide with the projection of the sealing piece (71) in the height direction of the battery cell structure; and / or, The projection of the welding area of the positive electrode connecting piece (80) does not coincide with the projection of the sealing glue film (50).

18. The cell structure of claim 16, wherein, The sealing cover (70) comprises a sealing piece (71) and a limiting table (72), the limiting table (72) is arranged on the sealing piece (71), the limiting table (72) faces the cavity of the shell main body (10), and the limiting table (72) is inserted in the liquid injection hole (323); The positive electrode connecting piece (80) is welded with the sealing piece (71).

19. The cell structure of claim 16, wherein, Further comprising a negative electrode connecting piece (90), the negative electrode connecting piece (90) is welded with the shell cover (20) or the connecting piece (40), the negative electrode lead (901) of the negative electrode connecting piece (90) is located on the side of the pole column (30) away from the shell main body (10), and the second insulating piece (92) is arranged between the positive electrode connecting piece (80) and the connecting piece (40).

20. The cell structure of claim 19, wherein, The projection of the welding area of the negative electrode connecting piece (90) does not coincide with the projection of the sealing glue film (50).

21. The cell structure of claim 16, wherein, Further comprising a negative electrode connecting piece (90), the negative electrode connecting piece (90) is welded with the bottom wall (101) of the shell main body (10).

22. The cell structure of claim 21, wherein, The thickness of the welding area of the negative electrode connecting piece (90) is less than the thickness of other areas of the negative electrode connecting piece (90).

23. A battery, characterized by The battery cell structure comprises the battery cell structure according to any one of claims 1-22.

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