Batteries, winding bodies and current collecting plates

Abstract

The present application provides a battery, a winding body and a current collecting plate, which relate to the field of battery technology. The battery comprises a winding body and a shell; the winding body is a column, and the top and bottom surfaces of the winding body are respectively provided with a first boss and a second boss, the diameter of the first boss is smaller than the diameter of the column, and the diameter of the second boss is smaller than the diameter of the column, so as to avoid the positive electrode of the winding body from contacting with the shell after entering the shell and causing a short circuit, thereby improving the safety of the battery when in use.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, a winding body and a current collecting disc. Background Art

[0002] The wound body in the current battery is easily in contact with the outer shell when it is put into the shell, causing a short circuit, which poses a safety hazard during the production and use of the battery. Summary of the invention

[0003] The embodiments of the present application provide a battery, a winding body and a current collecting plate to solve the problem of potential safety hazards in the production and use of batteries in the prior art.

[0004] The technical solutions of the embodiments of the present application are as follows:

[0005] The embodiment of the present application provides a battery, comprising a wound body and a shell. The wound body is a cylinder, and the top and bottom surfaces of the wound body are respectively provided with a first boss and a second boss, the diameter of the first boss is smaller than the diameter of the cylinder, and the diameter of the second boss is smaller than the diameter of the cylinder, so as to avoid the positive electrode of the wound body from contacting the shell and causing a short circuit when entering the shell.

[0006] In the above implementation process, the diameter of the first boss is smaller than the diameter of the column, and the diameter of the second boss is smaller than the diameter of the column, thereby avoiding short circuit when the winding body enters the shell and improving the safety of the battery.

[0007] Optionally, the battery provided in the embodiment of the present application further includes a positive current collector and a negative current collector. The positive current collector is connected to the first boss, the positive current collector is a metal disk with an edge bent at a preset angle, and the diameter of the positive current collector matches the diameter of the first boss. The negative current collector is connected to the second boss, the negative current collector is a metal disk with an edge bent at a preset angle, and the diameter of the negative current collector matches the diameter of the second boss.

[0008] In the above implementation process, the edges of the positive current collector disc and the negative current collector disc are bent at the preset angle, thereby enhancing the rigidity of the positive current collector disc and the negative current collector disc, preventing the positive current collector disc and the negative current collector disc from being deformed during the welding process, and improving the welding quality of the positive current collector disc, the negative current collector disc and the winding body.

[0009] Optionally, the first boss in the battery provided in an embodiment of the present application is provided with an injection hole, and the injection hole is connected to the internal cavity of the winding body for injecting electrolyte.

[0010] In the above implementation process, the electrolyte is easily injected into the interior of the wound body through the injection hole.

[0011] Optionally, in the battery provided in the embodiment of the present application, the edge of the positive electrode current collecting disk is further connected to a positive electrode lug, and the positive electrode lug and the first boss form a full electrode lug.

[0012] In the above implementation process, the positive electrode ear is a full-pole ear, which can greatly reduce the AC internal resistance and the DC internal resistance, thereby reducing the temperature increase of the battery to achieve fast charging and high-rate discharge.

[0013] Optionally, the positive current collector disc and the negative current collector disc of the battery provided in an embodiment of the present application are respectively connected to the first boss and the second boss by surface welding, and the welding points of the surface welding of the positive current collector disc and the first boss are located at the joint between the positive current collector disc and the first boss, and at the joint between the negative current collector disc and the second boss.

[0014] In the above implementation process, the positive current collector disc and the negative current collector disc are respectively connected to the first boss and the second boss by surface welding. The surface welding method makes the positive current collector disc and the negative current collector disc less likely to deform and can fully fit with the winding body, thereby improving the welding quality of the battery.

[0015] Optionally, the battery provided in an embodiment of the present application also includes a cap, which is arranged on the top surface, and the diameter of the cap is greater than or equal to the diameter of the positive current collecting disk, so that when the cap is welded on the top surface, it covers the positive current collecting disk and the first boss, and the positive electrode ear is connected to the cap.

[0016] In the above implementation process, the cap and the shell cover the first boss and seal the wound body, thereby preventing the electrolyte from flowing out of the shell and improving the safety of the battery.

[0017] Optionally, the battery provided in the embodiment of the present application further includes an insulating reinforcement film, wherein the insulating reinforcement film is wrapped around the outer surface of the winding body.

[0018] In the above implementation process, the insulating reinforcement film is wrapped around the outer surface of the winding body to reinforce the winding body and prevent the winding body from loosening. At the same time, the insulating reinforcement film insulates the winding body to prevent the winding body from conducting electricity with the outside world, thereby improving the safety performance of the battery.

[0019] Optionally, the outer shell of the battery described in any one of the above embodiments provided in the present application is a hollow cylinder with an opening on the top surface surrounding the wound body, the top surface or bottom surface of the outer shell is detachably connected to the outer shell, and the bottom surface of the hollow cylinder is connected to the wound body.

[0020] In the above implementation process, the shell surrounds the wound body to prevent the wound body from being damaged due to impact, water vapor, etc. when placed in the environment, thereby increasing the service life of the battery.

[0021] An embodiment of the present application also provides a winding body, which is a cylinder, and the top and bottom surfaces of the winding body are respectively provided with a first boss and a second boss, the diameter of the first boss is smaller than the diameter of the cylinder, and the diameter of the second boss is smaller than the diameter of the cylinder, so that the first boss and the second boss will not touch the outer shell when the winding body enters the outer shell, so as to avoid a short circuit caused by the contact with the outer shell when the winding body enters the outer shell of the battery.

[0022] In the above implementation process, the diameter of the first boss is smaller than the diameter of the column, and the diameter of the second boss is smaller than the diameter of the column, thereby avoiding short circuit caused by the contact between the winding body and the battery shell when assembled into a battery, thereby improving the safety of the winding body application.

[0023] An embodiment of the present application also provides a current collecting plate, comprising: a positive current collecting plate and a negative current collecting plate; the positive current collecting plate is used to connect with the first boss of the above-mentioned winding body, the positive current collecting plate is a metal plate with an edge bent at a preset angle, and the diameter of the positive current collecting plate matches the diameter of the first boss; the negative current collecting plate is used to connect with the second boss of the winding body, the negative current collecting plate is a metal plate with an edge bent at a preset angle, and the diameter of the negative current collecting plate matches the diameter of the second boss.

[0024] In the above implementation process, the edges of the positive current collector disc and the negative current collector disc are bent at the preset angle, thereby enhancing the rigidity of the positive current collector disc and the negative current collector disc, preventing the positive current collector disc and the negative current collector disc from being deformed during the welding process, and improving the welding quality of the positive current collector disc, the negative current collector disc and the winding body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] As shown in the accompanying drawings, the above and other purposes, features and advantages of the present application will be more clear. The same figure marks in all the drawings indicate the same parts, and the drawings are not deliberately scaled according to the actual size. The focus is on showing the purpose of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present application, it should be noted that the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by implementing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description and the drawings.

[0031] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0032] Figure 2 A front view of a winding body provided in an application embodiment.

[0033] Figure 3 A top view of a winding body provided in an application embodiment.

[0034] Figure 4 A schematic structural diagram of a positive electrode current collecting disk provided in an application embodiment.

[0035] Figure 5 A schematic diagram of the structure of a negative electrode current collector provided in an application embodiment.

[0036] Icons: 10 - battery; 101 - winding body; 1011 - first boss; 1012 - second boss; 102 - housing; 103 - positive electrode collector; 104 - negative electrode collector; 105 - injection hole; 106 - positive electrode ear; 107 - cap; 108 - insulation reinforcement film. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] Please see Figure 1 , Figure 1 A schematic diagram of the structure of a battery 10 provided in an embodiment of the present application.

[0039] The battery 10 includes a jellyroll 101 and a housing 102 . The housing 102 is used to accommodate and protect the jellyroll 101 .

[0040] The winding body 101 is a cylinder, and the top and bottom surfaces of the winding body 101 are respectively provided with a first boss 1011 and a second boss 1012. The diameter of the first boss 1011 is smaller than the diameter of the cylinder, and the diameter of the second boss 1012 is smaller than the diameter of the cylinder to avoid a short circuit caused by the first boss 1011 or the second boss 1012 contacting the outer shell 102 when the winding body 101 enters the outer shell 102 of the battery 10.

[0041] Optionally, the wound body 101 may be a column such as a cylinder or a prism, and when the wound body 101 enters the outer shell 102, a short circuit phenomenon is avoided when the positive electrode of the wound body 101 enters the outer shell, thereby improving the safety of the battery 10 during production and use.

[0042] Optionally, the first boss 1011 or the second boss 1012 may be formed by flattening a reserved blank foil.

[0043] Optionally, the cross-sectional shape of the first boss 1011 and the second boss 1012 may be the same as that of the wound body 101 , and the height thereof protruding from the wound body 101 may be adjusted according to specific needs according to the relative distance between the two when the wound body 101 is placed in the housing 102 .

[0044] Please see Figure 2 , Figure 3 . Figure 2 This is a front view of a winding body provided in an embodiment of the present application. Figure 3 A top view of a winding body provided in an embodiment of the present application.

[0045] As an implementation mode, selecting a cylindrical shape as the shape of the winding body 101 can effectively increase the volume of the winding body 101 under the same area of ​​material.

[0046] See also Figure 4 , Figure 5 . Figure 4 A schematic diagram of the structure of a positive electrode current collector provided in an embodiment of the application, Figure 5 A schematic diagram of the structure of a negative electrode current collector provided in an application embodiment.

[0047] Optionally, the battery 10 further includes a positive current collector disc 103 and a negative current collector disc 104, the positive current collector disc 103 is connected to the first boss 1011, the positive current collector disc 103 is a metal disc with an edge bent at a preset angle, and the diameter of the positive current collector disc 103 matches the diameter of the first boss 1011. The negative current collector disc 104 is a metal disc with an edge bent at a preset angle, and the diameter of the negative current collector disc 104 matches the diameter of the second boss 1012.

[0048] The preset angle of the edge bend of the positive collector disc 103 refers to the angle between the positive collector disc 103 and the non-bent plane of the positive collector disc 103, and the preset angle can be specifically set according to the structural strength, material properties, etc., such as 80°, 90°, 95°, etc. It should be understood that the edge bend setting in the negative collector disc 104 is similar to that of the positive collector disc 103.

[0049] It can be understood that the diameter of the positive current collecting disc 103 matches the diameter of the first boss 1011, which means that the diameter of the positive current collecting disc 103 is greater than or equal to the diameter of the first boss 1011, and less than or equal to the diameter of the column.

[0050] Likewise, matching the diameter of the negative electrode current collecting disc 104 with the diameter of the second boss 1012 means that the diameter of the negative electrode current collecting disc 104 is greater than or equal to the diameter of the second boss 1012 and less than or equal to the diameter of the column.

[0051] The positive electrode collector 103 and the negative electrode collector 104 can stably fit with the first boss 1011 or the second boss 1012 when the above-mentioned diameters are met, but will not exceed the top or bottom surface of the winding body 101, thereby avoiding a short circuit caused by the positive electrode collector 103 or the negative electrode collector 104 touching the outer shell 102.

[0052] Typically, the connection method between the positive electrode current collecting disc 103 and the first boss 1011 , and the connection method between the negative electrode current collecting disc 104 and the second boss 1012 may also be, but not limited to, spot welding or surface welding.

[0053] Spot welding refers to a welding method that uses a columnar electrode to form a welding spot between the contact surfaces of two overlapping workpieces. Spot welding is mainly used for welding thin plate components and stamping parts with a thickness of less than 4 mm. Surface welding is a welding method based on the weld seam to weld the welding surface as a whole. Surface welding has certain requirements for the thickness and width of the weld seam. Therefore, this embodiment can flexibly select the welding method according to the thickness, area and other parameters of the positive collector plate 103 and the negative collector plate 104.

[0054] The positive electrode current collecting plate 103 guides and protects the first boss 1011. Since copper and aluminum have good conductivity, soft texture, and good stability, and copper and aluminum are relatively cheap, and copper and aluminum resources are abundant in the world, the positive electrode current collecting plate 103 can be made of metal materials such as aluminum or aluminum alloys, and the negative electrode current collecting plate 104 can be made of nickel-plated copper or other copper alloys.

[0055] Optionally, a liquid injection hole 105 is provided on the first boss 1011 , and the liquid injection hole 105 is communicated with the internal cavity of the winding body 101 for injecting electrolyte.

[0056] It is understandable that the shape of the injection hole 105 can be a common geometric shape such as a circle, a square, a triangle, etc.

[0057] Please continue to see Figure 4 The edge of the positive current collecting disk 103 is also connected to a positive electrode ear 106, which is a full-electrode ear. The full-electrode ear can greatly reduce the AC internal resistance and the DC internal resistance, thereby reducing the temperature rise of the battery to achieve fast charging and high-rate discharge.

[0058] Please continue to see Figure 1 The positive electrode tab 106 utilizes the empty foil area formed by the first boss 1011 to form a full tab, and there is no need to weld multiple tabs to the positive electrode current collecting plate 103, thereby reducing the complexity of battery manufacturing.

[0059] The positive current collector 103 and the negative current collector 104 are connected to the first boss 1011 and the second boss 1012 respectively by surface welding. The welding point of the surface welding between the positive current collector 103 and the first boss 1011 is located at the joint between the positive current collector 103 and the first boss 1011, and the welding point of the surface welding between the negative current collector 104 and the second boss 1012 is located at the joint between the negative current collector 104 and the second boss 1012.

[0060] The positive electrode current collector 103 and the negative electrode current collector 104 are connected to the first boss 1011 and the second boss 1012 respectively by surface welding. The surface welding method makes the positive electrode current collector 103 and the negative electrode current collector 104 not easy to deform, and can improve the fit with the winding body 101, making the welding more firm, thereby improving the internal welding quality of the battery 10.

[0061] As another embodiment, the positive electrode current collecting disc 103 and the negative electrode current collecting disc 104 can also be connected to the first boss 1011 and the second boss 1012 respectively by spot welding. The spot welding method has a fast welding speed, which improves the welding rate of the positive electrode current collecting disc 103 and the negative electrode current collecting disc 104 to the first boss 1011 and the second boss 1012 respectively.

[0062] Optionally, the battery 10 further includes a cap 107 , which is disposed on the top surface. The cap 107 has a diameter greater than or equal to the diameter of the positive electrode current collecting disc 103 , so that when the cap 107 is welded on the top surface, it covers the positive electrode current collecting disc 103 and the first boss 1011 , and the positive electrode ear 106 is connected to the cap 107 .

[0063] It should be understood that the cap 107 needs to have a conductive function, so the cap 107 needs to be connected to the positive ear 106. As an embodiment, the positive ear 106 and the cap 107 can be connected by welding, and welding points are selected on the inner surface of the cap 107, and welding can be performed by spot welding or surface welding. The cap 107 seals the battery 10, and the cap 107 can be made of an alloy material with relatively stable performance in an exposed environment, such as stainless steel.

[0064] Optionally, the battery 10 further includes an insulating reinforcement film 108 , which is wrapped around the outer surface of the winding body 101 .

[0065] As an implementation method, the insulating reinforcement film 108 can be a material with good insulating properties such as termination tape, plastic, etc. The termination tape is made of insulating materials such as polypropylene, polyester or polyimide as a base material, and is coated with acrylic glue specially used for electrolyte. It has high electrical insulation, suitable adhesion and conformability, and no residual glue after peeling off.

[0066] The insulating reinforcement film 108 seals the wound body 101 to prevent the wound body 101 from loosening. At the same time, the insulating reinforcement film 108 insulates the wound body 101 to prevent electrical conduction with the outside world, thereby improving the safety performance of the battery 10.

[0067] Optionally, according to any of the above battery 10, the housing 102 is a hollow cylinder surrounding the jellyroll 101, and the top or bottom surface of the housing 102 is detachably connected to the housing to facilitate the insertion or removal of the jellyroll 101. The housing 102 is generally made of steel with good pressure resistance and corrosion resistance.

[0068] To summarize, an embodiment of the present application provides a battery, which includes: a winding body and a shell; the winding body is a cylinder, and the top and bottom surfaces of the winding body are respectively provided with a first boss and a second boss, the diameter of the first boss is smaller than the diameter of the cylinder, and the diameter of the second boss is smaller than the diameter of the cylinder, so as to avoid a short circuit caused by contact with the shell when the winding body enters the shell, thereby improving the safety of the battery when in use.

[0069] An embodiment of the present application also provides a winding body, which is a cylinder, and the top and bottom surfaces of the winding body are respectively provided with a first boss and a second boss, the diameter of the first boss is smaller than the diameter of the cylinder, and the diameter of the second boss is smaller than the diameter of the cylinder, so as to avoid a short circuit caused by contact with the outer shell of the battery when the winding body enters the outer shell of the battery.

[0070] An embodiment of the present application also provides a current collecting plate, comprising: a positive current collecting plate and a negative current collecting plate; the positive current collecting plate is used to connect with the first boss of the above-mentioned winding body, the positive current collecting plate is a metal plate with an edge bent at a preset angle, and the diameter of the positive current collecting plate matches the diameter of the first boss; the negative current collecting plate is used to connect with the second boss of the winding body, the negative current collecting plate is a metal plate with an edge bent at a preset angle, and the diameter of the negative current collecting plate matches the diameter of the second boss.

[0071] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0072] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A battery, It is characterized in that include: winding body and casing; The wound body is a cylinder, and the top and bottom surfaces of the wound body are respectively provided with a first boss and a second boss, the diameter of the first boss is smaller than the diameter of the cylinder, and the diameter of the second boss is smaller than the diameter of the cylinder, so as to avoid the positive electrode of the wound body from contacting the shell and causing a short circuit when entering the shell; The battery also includes a positive electrode current collector disk and a negative electrode current collector disk; The positive electrode current collecting disk is connected to the first boss, the positive electrode current collecting disk is a metal disk with an edge bent at a preset angle, and the diameter of the positive electrode current collecting disk matches the diameter of the first boss; The negative electrode current collecting disk is connected to the second boss, the negative electrode current collecting disk is a metal disk with an edge bent at a preset angle, and the diameter of the negative electrode current collecting disk matches the diameter of the second boss; The first boss is provided with a liquid injection hole, which is connected to the internal cavity of the winding body and is used for injecting electrolyte; The edge of the positive current collector is also connected to a positive electrode ear, and the positive electrode ear and the first boss form a full electrode ear; The positive electrode current collector and the negative electrode current collector are connected to the first boss and the second boss respectively by surface welding, the welding point of the positive electrode current collector and the first boss is located at the joint of the positive electrode current collector and the first boss, and the welding point of the negative electrode current collector and the second boss is located at the joint of the negative electrode current collector and the second boss; The first boss and the second boss are formed by flattening a reserved blank foil; the cross-sectional shape of the first boss and the second boss is the same as that of the winding body.

2. The battery according to claim 1, It is characterized in that The battery further includes a cap, which is disposed on the top surface. The cap has a diameter greater than or equal to that of the positive current collector, so that when the cap is welded on the top surface, it covers the positive current collector and the first boss, and the positive electrode ear is connected to the cap.

3. The battery according to claim 1, It is characterized in that The battery further includes an insulating reinforcement film wrapped around the outer surface of the winding body.

4. The battery according to any one of claims 1 to 3, It is characterized in that The shell is a hollow cylinder with an opening on the top surface surrounding the winding body, and the bottom surface of the hollow cylinder is connected to the winding body.

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