Battery preparation method and battery

Abstract

The present invention relates to a method for preparing a battery and a battery. The method comprises: providing a shell, a cover plate and a cap, wherein a receiving cavity is formed inside the shell, the shell has an opening communicating with the receiving cavity, the cover plate has a first through hole, and the cap comprises a body; fixing the cover plate to the opening; arranging the cap on the cover plate, and connecting the cap to the cover plate through an insulating member.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more specifically, to a method for preparing a battery and a battery. Background Art

[0002] The battery generally includes a shell and a cap assembly. The cap assembly includes a cover plate, an insulating rubber ring and a cap. The cover plate, the insulating rubber ring and the cap are stacked. When assembling, first, the cover plate, the insulating rubber ring and the cap are fixed together; then, the cover plate is welded to the opening of the shell. However, due to the heat release during the welding process, the heat is transferred to the insulating rubber ring, causing the insulating rubber ring to deform, resulting in the connection between the cover plate and the cap being destroyed, and even a gap, which makes the battery prone to leakage.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for a method for preparing a battery.

[0005] According to one aspect of the present invention, a method for preparing a battery is provided. The method comprises:

[0006] A housing, a cover plate and a cap are provided, wherein a receiving cavity is formed inside the housing, the housing has an opening communicating with the receiving cavity, the cover plate has a first through hole, and the cap includes a body portion;

[0007] fixing the cover plate to the opening;

[0008] The cover cap is arranged on the cover plate, and the cover cap is connected to the cover plate through an insulating member.

[0009] Optionally, the cover plate is fixed to the opening by welding.

[0010] Optionally, the step of arranging the cap on the cover plate, wherein the cap is connected to the cover plate via an insulating member, comprises:

[0011] An adhesive is provided between the cover plate and the cover cap, and the cover plate and the cover cap are connected by the adhesive, and the adhesive is the insulating member.

[0012] Optionally, the adhesive is a thermosetting adhesive or a UV adhesive.

[0013] Optionally, the insulating member includes an insulating rubber ring, the insulating rubber ring has a second through hole opposite to the first through hole, and the main body is provided with a boss; the cap is provided on the cover plate, and the cap is connected to the cover plate through the insulating member, comprising:

[0014] Placing an insulating rubber ring on the cover plate;

[0015] The cap is arranged on the insulating rubber ring, and the boss passes through the second through hole and the first through hole;

[0016] The cover plate, the insulating rubber ring and the cover cap are fixed together.

[0017] Optionally, before the insulating rubber ring is arranged on the cover plate, the method includes:

[0018] An adhesive is provided on at least one of the insulating rubber ring and the cover plate.

[0019] Optionally, before the cap is arranged on the insulating rubber ring and the boss passes through the second through hole and the first through hole, the method further comprises:

[0020] An adhesive is provided on at least one of the insulating rubber ring and the cap.

[0021] Optionally, the adhesive is a hot melt adhesive, and the hot melt adhesive is cured by hot melting to bond the cover plate, the insulating rubber ring, and the cover cap together.

[0022] Optionally, the insulating rubber ring is a hot melt adhesive, and the insulating rubber ring is melted by hot melting so that the insulating rubber ring is bonded to the cap and the cover plate respectively.

[0023] Optionally, after the cap is disposed on the cover plate and the cap is connected to the cover plate through an insulating member, the method further comprises:

[0024] A sealant is applied to the gap between the cover cap and the cover plate.

[0025] Optionally, the sealant includes at least one of silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, chloroprene sealant, siloxane sealant, PVC sealant, and asphalt sealant.

[0026] According to another aspect of the present invention, a battery is provided. The battery is prepared according to the preparation method described in the present application.

[0027] One technical effect of the present invention is that, in the embodiment of the present application, first, the cover plate is fixed at the opening of the shell. Then, the cover plate cap is set on the cover plate, and the two are connected together through the insulating member. In this way, it is possible to effectively avoid the heat from welding between the cover plate and the shell from damaging the insulating member, thereby achieving a good sealing effect of the battery and improving the yield rate of the battery.

[0028] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0030] Figure 1 is a cross-sectional view of a cap assembly according to an embodiment of the present application.

[0031] Figure 2 It is a cross-sectional view of another cap assembly according to an embodiment of the present application.

[0032] Figure 3 It is an exploded view of a cap assembly without sealant according to an embodiment of the present application.

[0033] Figure 4 It is a schematic structural diagram of a cap according to an embodiment of the present application.

[0034] Figure 5 It is a bottom view of the cap assembly according to an embodiment of the present application.

[0035] Figure 6 is a cross-sectional view of a button battery according to an embodiment of the present application.

[0036] Figure 7 is a cross-sectional view of another button-type battery according to an embodiment of the present application.

[0037] Figure 8 is a flow chart of a method for preparing a battery according to an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 100, cover plate; 101, first through hole;

[0040] 200, insulating rubber ring; 201, annular protrusion; 202, second through hole;

[0041] 300, cap; 301, boss; 301a, welding point; 302, first gap; 303, second gap;

[0042] 400, sealant;

[0043] 500, housing; 501, side wall; 502, bottom wall;

[0044] 600, battery cell; 601, positive electrode ear; 602, negative electrode ear; 603, cavity; 604, upper end surface. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0047] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0048] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0050] According to one embodiment of the present application, a method for preparing a battery is provided. Figures 1 to 8 As shown, the preparation method comprises:

[0051] A housing 500, a cover plate 100 and a cap 300 are provided, wherein the housing 500 forms a receiving cavity inside, the housing 500 has an opening communicating with the receiving cavity, the cover plate 100 has a first through hole 101, and the cap 300 includes a body portion;

[0052] Fixing the cover plate 100 to the opening of the housing 500;

[0053] The cap 300 is disposed on the cover plate 100 , and the cap 300 is connected to the cover plate 100 via an insulating member.

[0054] Specifically, the battery can be, but is not limited to, a button battery, a cylindrical battery, etc. The housing 500, the cover plate 100, and the cap 300 are made of metal materials, such as stainless steel, aluminum alloy, copper alloy, etc. The housing 500 includes a side wall 501, and one end of the side wall 501 forms an opening. Figure 6 , Figure 7As shown, the side wall 501 forms a cylindrical structure. The cylindrical structure has two opposite openings. The bottom wall is arranged at one of the openings. The cover plate 100 assembly includes the cover plate 100 and the cap 300. For example, a boss 301 is arranged in the middle of the main body. A first through hole 101 is arranged in the middle of the cover plate 100. The boss 301 is inserted into the first through hole 101, thereby connecting to the battery cell 600 or to an external circuit. In other examples, the main body may also be a boss 301. The main body is a flat plate.

[0055] The cover plate 100 is fixed at the opening of the housing 500 by welding. For example, the edge of the cover plate 100 is sealed at the opening at one end of the side wall 501 by laser welding, resistance welding, ultrasonic welding, etc.

[0056] An insulating member is provided between the cap 300 and the cap plate 100. The insulating member connects the cap 300 and the cap plate 100 together. The cap plate 100 and the cap 300 are usually connected to different electrodes of the battery cell 600. The insulating member can prevent a short circuit between the cap 300 and the cap plate 100.

[0057] In the embodiment of the present application, first, the cover plate 100 is fixed at the opening of the housing 500. Then, the cover plate 100 cap 300 is set on the cover plate 100, and the two are connected together through the insulating member. In this way, the heat of welding between the cover plate 100 and the housing 500 can be effectively prevented from damaging the insulating member, so that the sealing effect of the battery is good and the yield rate of the battery is improved.

[0058] In one example, the step of arranging the cap on the cover plate, wherein the cap is connected to the cover plate via an insulating member, comprises:

[0059] An adhesive is disposed between the cover plate 100 and the cap 300 , and the cover plate 100 is connected to the cap 300 through the adhesive. The adhesive is the insulating member.

[0060] In this example, the adhesive bonds the cover plate 100 and the cap 300 together after curing. For example, the adhesive is a polymer material. The adhesive may be, but is not limited to, an acrylic adhesive, a silicone adhesive, an epoxy resin, etc. The above materials all have insulating properties after curing, and can prevent a short circuit between the cover plate 100 and the cap 300.

[0061] Of course, the type of adhesive is not limited here, and those skilled in the art can set it according to actual needs.

[0062] In one example, the adhesive is a thermosetting adhesive or a UV adhesive.

[0063] Thermosetting adhesive refers to an adhesive that is initially in a colloid state and can be cured under heating conditions. For example, epoxy resin, etc. Thermosetting adhesive forms an insulating member after curing and fixes the cover plate 100 and the cap 300 together. UV glue can be cured under UV light. The cured UV glue forms an insulating member and fixes the cover plate 100 and the cap 300 together.

[0064] The specific materials of the thermosetting adhesive and the UV adhesive are not limited here, and those skilled in the art can select them according to actual needs.

[0065] In one example, the battery further includes an insulating rubber ring 200, the insulating rubber ring 200 has a second through hole 202 opposite to the first through hole 101, the body portion is provided with a boss; the cap is provided on the cover plate, and the cap is connected to the cover plate through an insulating member, including:

[0066] The insulating rubber ring 200 is arranged on the cover plate 100;

[0067] The cap 300 is disposed on the insulating rubber ring 200 , and the boss 301 passes through the second through hole 202 and the first through hole 101 ;

[0068] The cover plate 100 , the insulating rubber ring 200 , and the cover cap 300 are fixed together.

[0069] In this example, first, the insulating rubber ring 200 is disposed on the cover plate 100, and the second through hole 202 is disposed opposite to the first through hole 101. Then, the cap 300 is disposed on the insulating rubber ring 200, and the insulating rubber ring 200 is located between the cover plate 100 and the cap 300. Finally, the cover plate 100, the insulating rubber ring 200, and the cap 300 are fixed together to form an integral structure.

[0070] The insulating rubber ring 200 is made of plastic, rubber, silicone, etc. A second through hole 202 is provided in the middle of the insulating rubber ring 200. The insulating rubber ring 200 is in the shape of a circular ring, a rectangular ring, an elliptical ring, etc. The insulating rubber ring 200 has a good insulating effect and can avoid the phenomenon of uneven thickness of the adhesive at different parts, thereby improving the structural consistency of the cover plate 100 assembly.

[0071] Those skilled in the art can set the type, size, etc. of the insulating rubber ring 200 according to actual needs.

[0072] In one example, before the insulating rubber ring 200 is disposed on the cover plate 100, the following steps are included:

[0073] An adhesive is disposed on at least one of the insulating rubber ring 200 and the cover plate 100 .

[0074] In this example, the insulating rubber ring 200 and the cover plate 100 are connected together by an adhesive. The adhesive is as described above. The connection method using the adhesive is simple to operate.

[0075] In one example, before the cap 300 is disposed on the insulating rubber ring 200 and the boss 301 passes through the second through hole 202 and the first through hole 101, the method includes:

[0076] An adhesive is disposed on at least one of the insulating rubber ring 200 and the cap 300 .

[0077] In this example, the insulating rubber ring 200 and the cap 300 are connected together by an adhesive. The adhesive is as described above. The connection method using the adhesive is simple to operate.

[0078] In one example, the adhesive is hot melt adhesive, and the hot melt adhesive is cured by hot melting so that the cover plate 100, the insulating rubber ring 200, and the cover cap 300 are bonded together.

[0079] In this example, the hot melt adhesive is solid at room temperature, and becomes fluid and sticky after being heated. The hot melt adhesive is melted by hot melting, so that the insulating rubber ring 200, the cover plate 100, and the cap 300 are bonded together. The hot melt adhesive has the characteristics of fixed shape and easy positioning. For example, the hot melt adhesive is processed into a ring shape. When in use, the hot melt adhesive is placed between the insulating rubber ring 200 and the cover plate 100, and between the insulating rubber ring 200 and the cap 300. Since the hot melt adhesive has a fixed shape, it can be accurately positioned.

[0080] Optionally, the hot melt adhesive may be, but is not limited to, TPU hot melt adhesive, PES hot melt adhesive, EVA hot melt adhesive, PA hot melt adhesive, PO hot melt adhesive and EAA hot melt adhesive.

[0081] In one example, the insulating rubber ring 200 is hot melt adhesive, and the insulating rubber ring 200 is melted by hot melting so that the insulating rubber ring 200 is bonded to the cap 300 and the cover plate 100 respectively.

[0082] In this example, the insulating rubber ring 200 itself is made of hot melt adhesive, so there is no need to set up hot melt adhesive separately. When connecting, the insulating rubber ring 200 is directly hot-melted, so that the cover plate 100, the cap 300 and the insulating rubber ring 200 are bonded together.

[0083] In one example, after the cap is disposed on the cover plate and the cap is connected to the cover plate through an insulating member, the method includes:

[0084] A sealant 400 is applied to the gap between the cap 300 and the cover plate 100 .

[0085] In this example, the sealant 400 is a curing glue, that is, the sealant 400 is in liquid state in the initial state, so as to be applied to the above-mentioned gap. After curing, the sealant 400 is in solid state. The cured sealant 400 can fill the gap. For example, the sealant 400 includes at least one of silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, chloroprene sealant, siloxane sealant, PVC sealant, and asphalt sealant. All of the above materials can form good sealing and bonding effects.

[0086] The edge of the insulating rubber ring 200 is easy to fall off from the cover plate 100 and the cap 300. The edge of the insulating rubber ring 200 is usually located at the above-mentioned gap. In this example, the sealant 400 can effectively fill the gap between the cover plate 100 and the cap 300. The sealant 400 can strengthen the connection strength between the insulating rubber ring 200 and the cover plate 100 and the cap assembly to prevent the insulating rubber ring 200 from falling off.

[0087] In one example, the gap is formed between the boss 301 and the side wall of the first through hole 101 , and the sealant 400 is filled in the gap.

[0088] like Figure 2 As shown, the boss 301 is embedded in the first through hole 101 in the middle of the cover plate 100. An annular gap is formed between the side wall of the first through hole 101 and the boss 301. The sealant 400 is filled in the gap. The sealant 400 at this position can effectively prevent liquid or gas from overflowing from the gap.

[0089] In addition, the sealant 400 is an insulating material, and the sealant 400 at this position can effectively prevent the cover plate 100 and the cap 300 from being electrically connected.

[0090] The filling amount of the sealant 400 is not limited here, and those skilled in the art can set it according to actual needs.

[0091] In one example, the gap is formed between the outer edge of the cap 300 and the cover plate 100 , and the sealant 400 is filled in the gap.

[0092] like Figure 1 , Figure 5 As shown, an annular step structure is formed on the outer edge of the cap 300. The step structure forms an annular gap. The sealant 400 fills the gap. The sealant 400 has an annular structure. The length of the annular gap is relatively long. The sealant 400 fills the gap to effectively prevent liquid and gas from overflowing from the gap.

[0093] In addition, the sealant 400 covers the step structure to prevent the edges of the insulating rubber ring 200 and the cap 300 from being exposed, thereby reducing the surface tension there and reducing the strain generated by the insulating rubber ring 200 and the cap 300 there.

[0094] In addition, the sealant 400 can effectively prevent the accumulation of pollutants, especially salt, at the step structure, which may cause contamination and corrosion of the cap assembly.

[0095] In an example, the outer edge of the insulating rubber ring 200 protrudes from the outer edge of the cap 300 , the outer edge of the cover plate 100 protrudes from the outer edge of the insulating rubber ring 200 , and the sealant 400 covers the outer edge of the insulating rubber ring 200 and the outer edge of the cap 300 .

[0096] like Figure 1 , Figure 5 As shown, the cover plate 100 and the cap 300 usually connect different electrodes of the battery cell. The diameter of the insulating rubber ring 200 is larger than the diameter of the cap 300, so that the outer edge of the insulating rubber ring 200 protrudes from the outer edge of the cap 300. The diameter of the cover plate 100 is larger than the diameter of the insulating rubber ring 200, so that the outer edge of the cover plate 100 protrudes from the outer edge of the insulating rubber ring 200. In this arrangement, the outer edge of the insulating rubber ring 200 can effectively isolate the cover plate 100 and the cap 300, thereby effectively avoiding the formation of an electrical connection between the cover plate 100 and the cap. The cap 300, the insulating rubber ring 200 and the cover plate 100 form a multi-step structure at the edge position. The sealant 400 covering the multi-step structure can effectively prevent the multi-step structure from being exposed, and this method can reduce the accumulation of pollutants in the multi-step structure.

[0097] In addition, the softer insulating rubber ring 200 is sandwiched between the harder cover plate 100 and the cover cap 300. The insulating rubber ring 200 is prone to wrinkles at the outer edge and may fall off. The sealant 400 can effectively fix the insulating rubber ring 200, thereby improving the structural stability of the insulating rubber ring 200.

[0098] Of course, the cover plate 100, the insulating rubber ring 200 and the cover cap 300 are not limited to circular shapes, but may also be rectangular, elliptical or other shapes, and those skilled in the art may configure them according to actual needs.

[0099] In one example, an annular protrusion 201 is formed in the middle of the insulating rubber ring 200, and a second through hole 202 is formed inside the annular protrusion 201. The boss 301 is located in the second through hole 202 and abuts against the inner wall of the second through hole 202. The annular protrusion 201 is located in the first through hole 101 and abuts against the inner wall of the first through hole 101.

[0100] like Figure 1As shown, an annular protrusion 201 is formed in the middle of the insulating rubber ring 200. The annular protrusion 201 is embedded in the first through hole 101. For example, the insulating rubber ring 200 is integrally formed by injection molding. The insulating rubber ring 200 is bonded to the cover plate 100 and the cap assembly by an adhesive. The annular protrusion 201 is arranged around the second through hole 202. The insulating rubber ring 200 can isolate the cover plate 100 and the cap assembly to avoid electrical connection between the two. The annular protrusion 201 increases the connection area between the insulating rubber ring 200 and the cover plate 100 and the cap 300, thereby improving the structural strength of the cap assembly.

[0101] Of course, the shape of the insulating rubber ring 200 is not limited to the above embodiment, and those skilled in the art can configure it according to actual needs.

[0102] In one example, a gap is formed between the insulating rubber ring 200 and the cap 300, and the sealant 400 is filled in the gap; and / or

[0103] A gap is formed between the insulating rubber ring 200 and the cover plate 100 , and the sealant 400 is filled in the gap.

[0104] like Figure 2 As shown, a first gap 302 is formed between the insulating rubber ring 200 and the cap 300. A second gap 303 is formed between the insulating rubber ring 200 and the cover plate 100. The thickness of the outer edge of the insulating rubber ring 200 is usually thinner. The first gap 302 and the second gap 303 are both located at the outer edge of the insulating rubber ring 200, and the first gap 302 and the second gap 303 are respectively located on opposite sides of the insulating rubber ring 200. The sealant 400 is filled in the first gap 302 and the second gap 303. For example, the height of the first gap 302 and the second gap 303 is usually small, and the liquid sealant 400 is filled into the first gap 302 and the second gap 303 by using the siphon effect during filling.

[0105] The sealant 400 in the first gap 302 and the second gap 303 can further enhance the bonding force between the insulating rubber ring 200 and the cover plate 100 and the cover cap 300 , and prevent the first gap 302 and the second gap 303 from accumulating pollutants.

[0106] In an example, Figure 6 , Figure 7As shown, the side wall 501 of the shell 500 forms a cylindrical structure. The cylindrical structure has two opposite openings. At one end of the cylindrical structure, the cover plate 100 is fixed to the side wall 501 by laser welding, resistance welding, etc., and seals the opening of this end. A bottom wall 502 is provided at the other end of the cylindrical structure. The bottom wall 502 is fixed to the side wall 501 by laser welding, resistance welding, etc., and seals the opening of this end. For example, sealant 400 is provided at the middle and outer edge of the insulating rubber ring 200. A accommodating cavity is formed in the shell 500, and a battery cell is provided in the accommodating cavity. The battery cell is connected to the cap assembly and the bottom wall 502 through the pole ear.

[0107] The housing 500 has a good sealing effect.

[0108] Of course, the configuration of the sealant 400 is not limited to the above embodiment, and those skilled in the art can make a selection according to actual needs.

[0109] In one example, the cap 300 is located inside the housing 500 or outside the housing 500 .

[0110] like Figure 6 As shown, the cover plate 100 is fixed to one end of the side wall 501 of the shell 500 to form a seal. An insulating rubber ring 200 and a cap 300 are stacked on the side of the cover plate 100 that is away from the accommodating chamber. The surface of the cap 300 that is away from the boss 301 faces outward. This surface is used to be electrically connected to an external circuit. An annular sealant 400 is provided at the outer edge of the cap 300 and the insulating rubber ring 200. The sealant 400 can effectively protect the insulating rubber ring 200, can effectively prevent the gas and liquid in the accommodating chamber from overflowing, and can prevent the accumulation of pollutants there. The sealant 400 is provided between the boss 301 and the side wall 501 of the first through hole 101. The sealant 400 can further prevent the gas and liquid in the accommodating chamber from overflowing.

[0111] like Figure 7 As shown, the cover plate 100 is fixed to one end of the side wall 501 of the shell 500 to form a seal. An insulating rubber ring 200 and a cap 300 are stacked on the side of the cover plate 100 facing the accommodating chamber. The boss 301 of the cap 300 faces outward. The boss 301 is used to electrically connect to an external circuit. An annular sealant 400 is provided at the outer edge of the cap 300 and the insulating rubber ring 200. The sealant 400 can effectively protect the insulating rubber ring 200, can effectively prevent the gas and liquid in the accommodating chamber from overflowing, and can prevent the accumulation of pollutants there. A sealant 400 is provided between the boss 301 and the side wall of the first through hole 101. The sealant 400 can prevent the accumulation of pollutants there, and can further prevent the gas and liquid in the accommodating chamber from overflowing.

[0112] Of course, the structure of the housing 500 is not limited to the above embodiments, and those skilled in the art can configure it according to actual needs.

[0113] In one example, as mentioned above, the sealant 400 is located inside the housing 500 or outside the housing 500 .

[0114] In this example, the sealant 400 is located inside the housing 500 and can directly contact the gas and liquid in the accommodating cavity, achieving a good anti-leakage effect. The sealant 400 is located outside the housing 500 and can contact the external environment, avoiding the accumulation of pollutants in the gap.

[0115] Of course, those skilled in the art can set the amount and location of the sealant 400 according to actual needs.

[0116] According to another embodiment of the present application, a battery is provided. The battery is prepared according to the preparation method described in the present application.

[0117] For example, the battery is a cylindrical battery, a button battery, etc. The battery has a high yield rate.

[0118] In one example, the button battery also includes a battery cell 600, which includes a positive electrode sheet, a negative electrode sheet and a separator that are spirally wound together, the separator is located between the positive electrode sheet and the negative electrode sheet, and a cavity 603 is formed in the middle of the battery cell 600, the cavity 603 is arranged opposite to the boss 301, the positive electrode sheet is connected to a positive electrode ear 601, and the negative electrode sheet is connected to a negative electrode ear 602, the positive electrode ear 601 or the negative electrode ear 602 is flatly arranged between the end face of the battery cell 600 and the cover plate 100, the positive electrode ear 601 or the negative electrode ear 602 is connected to the boss 301 and covers the cavity 603, and the projection of the sealant 400 on the end face opposite to the boss 301 falls within the projection range of the positive electrode ear 601 or the negative electrode ear 602 on the end face.

[0119] like Figure 6As shown, the battery cell 600 is cylindrical. The cap 300 is located on the upper end surface 604 of the shell 500. The boss 301 is exposed to the accommodating cavity. A core column may be provided in the middle of the battery cell 600 or no core column is provided. The cavity 603 allows the electrolyte to pass through. For example, the positive ear 601 is an aluminum foil. The negative ear 602 is a copper foil. The positive ear 601 or the negative ear 602 is welded to the boss 301 by laser welding or resistance welding. For example, the positive ear 601 is flatly arranged between the upper end surface 604 of the battery cell 600 and the cover plate 100. An insulating layer is provided between the positive ear 601 and the battery cell 600 to prevent the positive electrode sheet from short-circuiting with the negative electrode sheet. The positive ear 601 and the negative ear 602 cover the cavity 603. Since the projection of the sealant 400 on the end face opposite to the boss 301 falls within the projection range of the positive ear 601 or the negative ear 602 on the end face, the sealant 400 is completely located within the range of the positive ear 601 or the negative ear 602. This arrangement allows the positive ear 601 or the negative ear 602 to cover the boss 301 and the sealant 400, further reducing the possibility of gas or liquid leakage in the accommodating cavity and improving the sealing performance of the button battery.

[0120] Of course, in other examples, the battery cell may also be a laminated structure.

[0121] In one example, the positive electrode tab 601 or the negative electrode tab 602 is connected to the boss 301 by welding, and the welding point 301 a faces the cavity 603 .

[0122] For example, laser welding or resistance welding is used to weld the positive electrode ear 601 or the negative electrode ear 602 to the boss 301 from the outside of the housing 500. The welding point 301a is directly opposite to the cavity 603, so that the welding point 301a falls into the cavity 603 instead of on the positive electrode sheet or the negative electrode sheet, thereby avoiding damage to the battery cell 600 caused by the heat during welding.

[0123] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing a battery, characterized in that: include: A housing, a cover plate and a cap are provided, wherein a receiving cavity is formed inside the housing, the housing has an opening communicating with the receiving cavity, the cover plate has a first through hole, and the cap includes a body portion, wherein the body portion is provided with a boss; First, fix the cover plate to the opening; Then, the cap is arranged on the cover plate, and the cap is connected to the cover plate through an insulating member; A gap is formed between the boss and the side wall of the first through hole, and the gap is filled with sealant; the battery includes a battery cell, and the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator that are spirally wound together, the separator is located between the positive electrode sheet and the negative electrode sheet, and a cavity is formed in the middle of the battery cell, the cavity is arranged opposite to the boss, the positive electrode sheet is connected with a positive electrode ear, and the negative electrode sheet is connected with a negative electrode ear, the positive electrode ear or the negative electrode ear is flatly arranged between the end face of the battery cell and the cover plate, the positive electrode ear or the negative electrode ear is connected to the boss and covers the cavity, and the projection of the sealant on the end face opposite to the boss falls within the projection range of the positive electrode ear or the negative electrode ear on the end face; the positive electrode ear or the negative electrode ear is connected to the boss by welding, and the welding point is opposite to the cavity.

2. The preparation method according to claim 1, characterized in that: The cover plate is welded and fixed to the opening.

3. The preparation method according to claim 1, characterized in that: The step of arranging the cap on the cover plate, wherein the cap is connected to the cover plate via an insulating member, comprises: An adhesive is provided between the cover plate and the cover cap, and the cover plate and the cover cap are connected by the adhesive, and the adhesive is the insulating member.

4. The preparation method according to claim 3, characterized in that: The adhesive is a thermosetting adhesive or a UV adhesive.

5. The preparation method according to claim 1, characterized in that: The insulating member includes an insulating rubber ring, and the insulating rubber ring has a second through hole opposite to the first through hole; the cap is arranged on the cover plate, and the cap is connected to the cover plate through the insulating member, comprising: Placing an insulating rubber ring on the cover plate; The cap is arranged on the insulating rubber ring, and the boss passes through the second through hole and the first through hole; The cover plate, the insulating rubber ring and the cover cap are fixed together.

6. The preparation method according to claim 5, characterized in that: Before the insulating rubber ring is arranged on the cover plate, the method includes: An adhesive is provided on at least one of the insulating rubber ring and the cover plate.

7. The preparation method according to claim 5, characterized in that: Before the cap is arranged on the insulating rubber ring and the boss passes through the second through hole and the first through hole, the method includes: An adhesive is provided on at least one of the insulating rubber ring and the cap.

8. The preparation method according to claim 6 or 7, characterized in that: The adhesive is a hot melt adhesive, which is cured by hot melting to bond the cover plate, the insulating rubber ring and the cover cap together.

9. The preparation method according to claim 5, characterized in that: The insulating rubber ring is a hot melt adhesive, and the insulating rubber ring is melted by hot melting so that the insulating rubber ring is bonded to the cap and the cover plate respectively.

10. The preparation method according to claim 1, characterized in that: After the cap is arranged on the cover plate and the cap is connected to the cover plate through an insulating member, the method comprises: A sealant is applied to the gap between the cover cap and the cover plate.

11. The preparation method according to claim 10, characterized in that: The sealant includes at least one of silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, chloroprene sealant, siloxane sealant, PVC sealant, and asphalt sealant.

12. A battery, characterized in that: Prepared according to the preparation method according to any one of claims 1 to 11.

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