Cap assembly and preparation method thereof, battery and preparation method thereof, and electronic equipment

Abstract

The embodiment of the invention provides a cap assembly and a preparation method thereof, a battery and a preparation method thereof, and electronic equipment. The preparation method of the cap assembly comprises the steps that a first cap is provided, and a through hole is formed in the first cap in the thickness direction of the first cap; an insulating glue layer is arranged on the first cap and covers the first area of the first cap, a notch is formed in the insulating glue layer, and the notch extends inwards along the edge of the insulating glue layer; a tab connecting part penetrates through the through hole, at least a first part of the tab connecting part is wrapped by tab glue, the first part is located at the notch and covers a second area of the first cap, the first part is further located in the through hole, and the second area is an area which is not covered by the insulating glue layer; and a second cap is arranged on the insulating rubber layer, and the first cap and the second cap are sealed in a hot pressing mode.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology. More specifically, the embodiments of the present application relate to a method for preparing a cap assembly, a method for preparing a battery, a cap assembly, a battery, and an electronic device. Background Art

[0002] During the manufacturing process of the battery, the positive and negative electrodes of the cap are often sealed through a precise PP glue hot pressing process to ensure electrical insulation and protection performance. However, this design consideration, while pursuing welding stability and preventing accidental short circuits between the positive and negative electrodes after welding, inevitably limits the size of the sealing area. Since the sealing area is carefully planned to avoid the risk of direct contact, this often results in a relatively small actual sealing area, which in turn increases the risk of sealing failure, especially in the face of extreme conditions of use or after long-term use.

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

[0004] The purpose of the present application is to provide a cap assembly and a method for preparing the same, a battery and a method for preparing the same, and a new technical solution for electronic equipment.

[0005] In a first aspect, an embodiment of the present application provides a method for preparing a cap assembly. The method for preparing the cap assembly comprises the following steps:

[0006] Providing a first cap, wherein the first cap has a through hole formed along a thickness direction thereof;

[0007] Placing an insulating rubber layer on the first cap and covering the first area of ​​the first cap, wherein the insulating rubber layer is formed with a notch, and the notch extends inwardly along the edge of the insulating rubber layer;

[0008] Pass the tab connection portion through the through hole, wherein at least a first portion of the tab connection portion is wrapped by the tab glue, and the first portion is located at the notch and covers a second area of ​​the first cap, and the first portion is also located in the through hole, and the second area is an area not covered by the insulating glue layer;

[0009] The second cap is placed on the insulating adhesive layer, and the first cap and the second cap are sealed by heat pressing.

[0010] Optionally, after sealing the first cap and the second cap, the method further comprises:

[0011] The second part and the third part connected to the first part are bent, wherein the second part and the third part are located at two ends of the first part, the second part is bent toward the center direction of the cap assembly and located at the second cap connection, and the third part is bent away from the center direction of the cap assembly.

[0012] Optionally, before the second part and the third part are bent, the method further comprises:

[0013] The third portion is wrapped with the tab glue, and at least a portion of the second portion is wrapped with the tab glue.

[0014] Optionally, after sealing the first cap and the second cap, the method further comprises:

[0015] The insulating film layer is sleeved on the tab connecting portion to fit the insulating film layer to the lower surface of the first cap.

[0016] Optionally, placing the insulating adhesive layer on the first cap specifically includes:

[0017] The projection of the notch in the thickness direction of the insulating adhesive layer covers the through hole.

[0018] In a second aspect, the present application also provides a method for preparing a battery. The method for preparing a battery comprises the following steps:

[0019] Providing a cap assembly, wherein the cap assembly is prepared by the method for preparing the cap assembly according to the first aspect;

[0020] A steel shell assembly is provided, comprising a steel shell and a battery cell disposed in the steel shell, wherein the battery cell comprises a first pole ear and a second pole ear, wherein the second pole ear is used for welding to the bottom surface of the steel shell;

[0021] Welding the first pole tab and the pole tab connecting portion together;

[0022] The first cap is welded to the steel shell.

[0023] In a third aspect, the present application also provides a cap assembly, which is prepared by the method for preparing the cap assembly as described in the first aspect.

[0024] Optionally, the cap assembly comprises: a first cap, an insulating rubber layer and a second cap which are stacked; the first cap is provided with a through hole along a thickness direction thereof, the insulating rubber layer is provided with a notch, and the notch is used to expose the second area of ​​the first cap;

[0025] The cap assembly further includes a tab connection portion, at least a first portion of the tab connection portion is wrapped with tab glue, and the tab connection portion passes through the through hole, so that a portion of the first portion covers the second area, and another portion of the first portion is disposed in the through hole;

[0026] The first cap and the second cap are sealed and connected via the insulating adhesive layer and the tab adhesive.

[0027] Optionally, the tab connection portion further includes a second portion and a third portion connected to the first portion and located at two ends of the first portion;

[0028] The second portion is bent toward the center direction of the cap assembly, and the second portion is connected to the second cap;

[0029] The third portion is bent in a direction away from the center of the cap assembly, and the third portion is used to be connected to the first pole ear of the battery.

[0030] Optionally, the third portion is wrapped by tab glue, and at least part of the second portion is wrapped by tab glue.

[0031] Optionally, the cap assembly further includes an insulating film layer, which is sleeved on the tab connecting portion and attached to the lower surface of the first cap.

[0032] In a fourth aspect, an embodiment of the present application further provides a battery, wherein the battery is prepared using the battery preparation method as described in the second aspect.

[0033] In a fifth aspect, an embodiment of the present application further provides a battery. The battery comprises a cap assembly as described in the third aspect;

[0034] The battery further comprises a steel shell assembly, wherein the steel shell assembly comprises a steel shell and a battery cell disposed in the steel shell;

[0035] The battery cell comprises a first pole lug and a second pole lug, the first pole lug is welded to the pole lug connecting portion, and the second pole lug is welded to the bottom surface of the steel shell;

[0036] The cap assembly is covered on the open end of the steel shell, and the first cap is welded to the steel shell.

[0037] In a sixth aspect, an embodiment of the present application further provides an electronic device, wherein the electronic device comprises the battery as described in the fourth aspect or the fifth aspect.

[0038] According to the embodiments of the present application, the cap assembly prepared by the method has better sealing performance, and the cap assembly is applied to the battery to improve the overall sealing performance of the battery. Specifically, by adjusting the circuit positive and negative lead-out methods of the first cap and the second cap, the sealing area between the first cap and the second cap is increased, and the risk of battery leakage is reduced.

[0039] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0041] Figure 1 The process of preparing the cap assembly provided in the embodiment of the present application is shown as follows: Figure 1 .

[0042] Figure 2a-2c Shown is flow chart 2 of the method for preparing a cap assembly provided in an embodiment of the present application.

[0043] Figure 3 Shown is a structural exploded view of a battery provided in an embodiment of the present application.

[0044] Figure 4 Shown is a structural cross-sectional view of a battery provided in an embodiment of the present application.

[0045] Figure 5 Shown is a schematic diagram of an existing battery structure.

[0046] Description of reference numerals:

[0047] 1. First cap; 10. Through hole;

[0048] 2. Insulation rubber layer; 20. Notch;

[0049] 3. Tab connection portion; 31. First portion; 32. Second portion; 33. Third portion;

[0050] 4. Ear glue;

[0051] 5. Second block;

[0052] 6. Insulation film layer;

[0053] 7. Steel shell assembly; 71. Steel shell; 72. Battery cell; 721. First pole ear; 722. Second pole ear;

[0054] 81. A first metal cap; 82. An insulating sealing gasket; 83. A second metal cap. DETAILED DESCRIPTION

[0055] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, 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 application.

[0056] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0057] 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.

[0058] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0059] 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.

[0060] Reference Figure 5 The cap assembly of the existing battery includes a first metal cap 81 similar to a convex structure and a second metal cap 83 in a flat shape. The first pole ear 721 is welded to the first metal cap 81, and the second metal cap 83 is welded to the steel shell 71. The second metal cap 83 is sleeved on the first metal cap 81, and an insulating sealing gasket 82 is arranged between the first metal cap 81 and the second metal cap 83. However, in order to ensure welding and avoid short circuit of the positive and negative electrodes after welding, the radial dimension of the first metal cap 81 is usually smaller than the radial dimension of the second metal cap 83. The area of ​​the insulating sealing gasket 82 sandwiched between the first metal cap 81 and the second metal cap 83 is limited, resulting in an excessively small sealing area, which makes the seal easily fail.

[0061] Based on the above technical problems, an embodiment of the present application provides a method for preparing a cap assembly.

[0062] Reference Figure 1 as well as Figure 2a-2c The preparation method of the cap assembly comprises the following steps:

[0063] S101: providing a first cap 1, wherein the first cap 1 is provided with a through hole 10 along a thickness direction thereof;

[0064] S102: placing an insulating rubber layer 2 on the first cap 1 and covering a first area of ​​the first cap 1, wherein a notch 20 is formed on the insulating rubber layer 2, and the notch 20 extends inwardly along an edge of the insulating rubber layer 2;

[0065] S103: passing the tab connection portion 3 through the through hole 10, wherein at least a first portion 31 of the tab connection portion 3 is wrapped by the tab glue 4, the first portion 31 is located at the notch 20 and covers a second area of ​​the first cap 1, and the first portion 31 is also located in the through hole 10, and the second area is an area not covered by the insulating glue layer 2;

[0066] S104: placing the second cover cap 5 on the insulating rubber layer 2, and sealing the first cover cap 1 and the second cover cap 5 by heat pressing.

[0067] In step S101: first, prepare a first cap 1, which is designed with a through hole 10 in the thickness direction. The through hole 10 is designed for the tab connection part 3 to pass through in the subsequent steps. As a part of the cap assembly, the material, size and shape of the first cap 1 need to be designed according to the specific application scenario.

[0068] Exemplarily, the first cap 1 is made of metal, such as steel, etc. The material of the first cap 1 can be the same as that of the battery steel shell 71, so that the first cap 1 and the steel shell 71 can be welded together.

[0069] The first cap 1 may be in the shape of a circular sheet with a through hole 10. Figure 4 The strip-shaped through hole 10 is convenient for the pole piece connection part to pass through in the subsequent steps.

[0070] In step S102: refer to Figure 2a Then, a layer of insulating adhesive layer 2 is placed on the first cap 1, and it is ensured that the insulating adhesive layer 2 covers the first area of ​​the first cap 1. Specifically, the insulating adhesive layer 2 is placed on the upper surface of the first cap 1 and fits with the upper surface of the first cap 1.

[0071] The insulating adhesive layer 2 has one function of providing electrical insulation to prevent current from flowing through unintended paths, thereby ensuring the safety of the battery assembly. Another function of the insulating adhesive layer 2 is to connect the first cap 1 and the second cap 5 to be provided in the subsequent step together by heat pressing. Exemplarily, the insulating adhesive layer 2 is a PP adhesive layer.

[0072] It should be emphasized that the insulating rubber layer 2 is designed to have a notch 20, which extends inward along the edge of the insulating rubber layer 2 (exemplarily, the shape of the notch 20 is similar to a U-shape), providing an exposure space for a specific position of the subsequent pole ear connection part 3, that is, the insulating rubber layer 2 is arranged on the first cap 1, and the insulating rubber layer 2 covers the first area of ​​the first cap 1, and the second area of ​​the first cap 1 is exposed through the notch 20, so that the first part 31 of the subsequent pole ear connection part 3 is arranged in the second area.

[0073] In step S103: refer to Figure 2a , after the insulating rubber layer 2 is placed, the tab connector 3 is passed through the through hole 10 of the first cap 1. The key here is that at least the first part 31 of the tab connector 3 is wrapped by the tab glue 4, and this part is located at the notch 20 of the insulating rubber layer 2, covering the second area not covered by the insulating rubber layer 2 (i.e., the area below the notch 20). The purpose of this design is to allow the tab connector 3 to maintain electrical connection while being protected by the insulating rubber layer 2 and the tab glue 4, avoiding direct contact between the first cap 1 and the subsequent second cap 5, so that the sealing area between the first cap 1 and the second cap 5 is maximized, reducing the risk of battery leakage, and improving the durability and safety of the battery assembly. At the same time, this part of the tab connector 3 is also located in the through hole 10, avoiding the electrical connection between the tab connector 3 and the first cap 1, and thus avoiding the risk of short circuit between the positive and negative electrodes inside the battery.

[0074] It should be emphasized that the pole ear connecting portion 3 is passed through the through hole 10 of the first cap 1, and the pole ear connecting portion 3 is led out of the first cap 1 for electrical connection with the subsequent second cap 5. The first cap 1 is used to electrically connect with the steel shell 71 of the battery (in the prior art, the first metal cap 81 located at the bottom is connected to the pole ear, and the second metal cap 83 located at the top is connected to the steel shell 71. In order to avoid contact between the first metal cap 81 and the inner wall of the steel shell 71, it is necessary to reduce the radial size of the first metal cap 81, thereby reducing the sealing area between the first metal cap 81 and the second metal cap 83). The advantage of this arrangement is that by improving the structure of the cap assembly, the first cap 1 located at the bottom is welded to the steel shell 71, and the ear connecting portion 3 is welded to the second cap 5 located at the top by a lead-out method. In this case, the radial dimensions of the first cap 1 and the second cap 5 can be set to be consistent, and the insulating and sealing components between the first cap 1 and the second cap 5 are consistent with the radial dimensions of the first cap 1 and the second cap 5. Without affecting welding, the sealing area between the first cap 1 and the second cap 5 is increased, thereby improving the overall sealing of the battery.

[0075] In addition, a notch 20 is provided on the insulating rubber layer 2, and a part of the first portion 31 of the tab connection part 3 is located at the notch 20, so that the consistency in thickness between the first portion 31 of the tab connection part 3 and the insulating rubber layer 2 can be ensured, thereby reducing the thickness of the cap assembly.

[0076] In step S104, refer to Figure 2b Finally, the second cap 5 is placed on the insulating rubber layer 2, specifically, the second cap 5 is placed on the insulating rubber layer 2 and the first portion 31 of the tab connection portion 3. After the second cap 5 is placed, the first cap 1 and the second cap 5 are sealed together by hot pressing.

[0077] This step is the key to the entire preparation process. It ensures the sealing of the cap assembly, prevents the intrusion of external harmful substances such as moisture and oxygen, and also avoids the risk of battery leakage, thereby protecting the internal structure of the battery.

[0078] The selection of hot pressing method is based on comprehensive consideration of the plasticity and sealing of the material. Through appropriate temperature and pressure, the first cap 1, the insulating glue layer 2, the pole ear connection part 3 (including the pole ear glue 4 wrapped part) and the second cap 5 are tightly combined to form a complete and sealed cap assembly.

[0079] Therefore, in this embodiment, the cap assembly prepared by the method has better sealing performance, and the cap assembly is applied to the battery to improve the overall sealing performance of the battery. Specifically, by adjusting the circuit positive and negative lead-out methods of the first cap 1 and the second cap 5, the sealing area between the first cap 1 and the second cap 5 is increased, and the risk of battery leakage is reduced.

[0080] In addition, the pole ear connecting part 3 wrapped with the pole ear glue 4 used in the soft-pack battery is led out through the through hole 10 of the first cap 1, and the first cap 1, the pole ear connecting part 3, and the second cap 5 can be sealed by the pole ear glue 4 coated on the pole ear and the other insulating glue layer 2 through hot pressing, so as to realize the combination of the soft-pack pole ear and the steel shell 71 sealed welding battery, which is convenient for flexible winding and pole ear welding in the process stage of the battery cell 72 and the subsequent PACK structure design.

[0081] In one embodiment, referring to Figure 2c After sealing the first cap 1 and the second cap 5, the method further includes: bending the second part 32 and the third part 33 connected to the first part 31, wherein the second part 32 and the third part 33 are located at both ends of the first part 31, the second part 32 is bent toward the center direction of the cap assembly and connected to the second cap 5, and the third part 33 is bent away from the center direction of the cap assembly.

[0082] In this embodiment, after the cap assembly is sealed, the second portion 32 and the third portion 33 connected to the first portion 31 of the tab connection portion 3 are bent. The two portions are located at both ends of the first portion 31 and are extensions of the first portion 31 of the tab connection portion 3.

[0083] Specifically, in the application to the battery, the second part 32 is located outside the steel shell assembly 7, and the second part 32 is bent toward the center direction of the cap assembly, and connected to or close to the second cap 5. This bending method helps to fix the pole ear connection part 3 more tightly on the cap assembly, reduce vibration and movement, and improve the reliability of the connection. Specifically, the current of the first pole ear 721 inside the battery is led out through the pole ear connection part 3, and the second cap 5 and the pole ear connection part 3 are electrically connected together. In the battery structure, the current of the first pole ear 721 in the battery can finally be led out through the second cap 5. Exemplarily, the material of the pole ear connection part 3 is a metal material, and the material of the pole ear connection part 3 can be the same as the material of the first pole ear 721.

[0084] In the application to the battery, the third part 33 is located inside the steel shell assembly 7, and the third part 33 is bent in a direction away from the center of the cap assembly. This design can be to provide more space in the subsequent PACK structure design, and also facilitate the connection with the first pole ear 721. For example, the third part 33 can be bent to be parallel to other parts of the battery (for example, bent to be parallel to the end face of the battery cell 72) or perpendicular (for example, can be bent to be perpendicular to the side wall of the steel shell 71), so as to facilitate welding with the first pole ear 721 led out from the battery cell 72.

[0085] In one embodiment, referring to Figure 2c Before the second part 32 and the third part 33 are bent, the method further includes: wrapping the third part 33 with the tab glue 4 , and wrapping at least part of the second part 32 with the tab glue 4 .

[0086] In this embodiment, the third part 33 of the pole lug connection part 3 is wrapped with the pole lug glue 4. For example, most of the surface of the third part 33 of the pole lug connection part 3 is wrapped with the pole lug glue 4. Only the end face of the third part 33 of the pole lug connection part 3 needs to be exposed to facilitate welding of the end face of the third part 33 of the pole lug connection part 3 with the first pole lug 721.

[0087] Wrapping the tab glue 4 on the third portion 33 of the tab connection portion 3 can avoid direct contact between the first cap 1 and the third portion 33 of the tab connection portion 3, thereby directly avoiding short circuit between the positive and negative electrodes inside the battery.

[0088] And the tab glue 4 is wrapped around at least part of the second portion 32 of the tab connection portion 3. For example, the tab glue 4 can be provided at the bending portion of the second portion 32 of the tab connection portion 3 to ensure that it will not be damaged during the bending process.

[0089] In one embodiment, referring to Figure 2c After the first cap 1 and the second cap 5 are sealed, the method further includes: sleeve the insulating film layer 6 on the tab connecting portion 3 to fit the insulating film layer 6 to the lower surface of the first cap 1 .

[0090] In this embodiment, after the first cap 1 and the second cap 5 are sealed, a step is added, that is, the insulating film layer 6 is sleeved outside the third portion 33 of the tab connection portion 3, and the insulating film layer 6 is ensured to be attached to the lower surface of the first cap 1. This step further enhances the insulation performance of the battery and improves the safety and reliability of the battery.

[0091] In one embodiment, placing the insulating adhesive layer 2 on the first cover cap 1 specifically includes: the through hole 10 is located in the area defined by the notch 20 .

[0092] In this embodiment, after the insulating rubber layer 2 is placed on the upper surface of the first cap 1, the positional relationship between the notch 20 formed by the insulating rubber layer 2 and the through hole 10 formed by the first cap 1 is defined. Specifically, the through hole 10 is located in the area defined by the notch 20, which means that the through hole 10 is not simply adjacent to or intersecting with the edge of the notch 20, but is completely located in the area surrounded by the boundary of the notch 20. This layout ensures that the tab connection portion 3 can be covered and laid flat in the area formed by the notch 20, so that sufficient insulation protection can be provided between the first cap 1 and the second cap 5.

[0093] In a second aspect, the present application also provides a method for preparing a battery. The method for preparing a battery comprises the following steps:

[0094] S201: providing a cap assembly, wherein the cap assembly is prepared by the method for preparing the cap assembly as described above;

[0095] S202: providing a steel shell assembly 7, comprising a steel shell 71 and a battery cell 72 disposed in the steel shell 71, wherein the battery cell 72 comprises a first pole ear 721 and a second pole ear 722, wherein the second pole ear 722 is used for welding to the bottom surface of the steel shell 71;

[0096] S203: welding the first electrode tab 721 and the electrode tab connecting portion 3 together;

[0097] S204: welding the first cover cap 1 and the steel shell 71 together.

[0098] In step S201: a cap assembly is provided. The cap assembly is prepared according to the preparation method of the cap assembly described above. This ensures that the cap assembly has the required insulation performance, sealing performance and design of the tab connection part 3, providing a solid foundation for the connection with the battery cell 72 in the subsequent steps.

[0099] In step S202: Next, prepare the steel shell assembly 7. The steel shell assembly 7 includes a steel shell 71 and a battery cell 72 placed in the steel shell 71. The battery cell 72 is the core part of the battery, which includes a first pole ear 721 and a second pole ear 722. Among them, the second pole ear 722 is usually welded to the bottom surface of the steel shell 71 to form a negative or positive connection of the battery. This design helps to simplify the battery structure and improve the overall stability and safety.

[0100] Exemplarily, the welding of the second pole tab 722 and the steel shell 71 can be performed after the welding of the first cap 1 and the steel shell 71 , or the welding of the second pole tab 722 and the steel shell 71 can be performed before the welding of the first pole tab 721 and the third portion 33 of the pole tab connecting portion 3 .

[0101] In step S203: the first tab 721 of the battery cell 72 is welded to the tab connection portion 3 in the cap assembly. This step is the key to the internal circuit connection of the battery, which ensures that the electric energy of the battery cell 72 can be effectively transmitted to the external circuit through the tab connection portion 3. The welding process requires precise control of parameters such as temperature, time and pressure to ensure reliable welding quality and avoid damage to the battery cell 72 and the cap assembly.

[0102] In step S204, the last step is to weld the first cap 1 of the cap assembly to the steel shell 71. This step completes the sealing of the battery shell and also firmly fixes the battery cell 72 inside the steel shell 71. The welding process also requires strict control of various parameters to ensure welding quality while maintaining the sealing and insulation properties of the battery. After completing this step, the overall structure of the battery is basically formed.

[0103] In a third aspect, the embodiment of the present application further provides a cap assembly. The cap assembly is prepared by the method for preparing the cap assembly as described in the first aspect. The embodiment of the present application provides a cap assembly with good insulation and sealing properties.

[0104] In one embodiment, referring to Figure 3 and Figure 4 The cap assembly comprises: a first cap 1, an insulating rubber layer 2 and a second cap 5 which are stacked; the first cap 1 is provided with a through hole 10 along its thickness direction, the insulating rubber layer 2 is formed with a notch 20, and the notch 20 is used to expose the second area of ​​the first cap 1;

[0105] The cap assembly further includes a tab connection portion 3, at least a first portion 31 of the tab connection portion 3 is wrapped with a tab glue 4, and the tab connection portion 3 passes through the through hole 10, so that a portion of the first portion 31 covers the second area, and another portion of the first portion 31 is disposed in the through hole 10;

[0106] The first cover cap 1 and the second cover cap 5 are sealed and connected via the insulating adhesive layer 2 and the tab adhesive 4 .

[0107] In this embodiment, the cap assembly includes a first cap 1, an insulating adhesive layer 2, and a second cap 5 which are stacked in sequence from the inside to the outside.

[0108] The first cap 1 is used as the inner layer of the cap assembly, and the through hole 10 opened along the thickness direction is used for the tab connection part 3 to pass through and fix the tab connection part 3. The design of the through hole 10 allows the tab connection part 3 to penetrate the first cap 1 and be welded with the first tab 721 of the battery cell 72.

[0109] The insulating rubber layer 2 is located between the first cap 1 and the second cap 5 to provide insulation and sealing. The notch 20 formed on the insulating rubber layer 2 is specially designed to expose the second area of ​​the first cap 1 so that a specific portion of the tab connector 3 can cover and be fixed on the area.

[0110] The second cap 5 is the outer layer of the cap assembly and is sealed with the first cap 1 through the insulating adhesive layer 2 and the ear adhesive 4 to form a sealed end cap of the battery.

[0111] In addition, in this embodiment, the tab connector 3 is a key component for connecting the first tab 721 of the battery cell 72 with the external circuit of the battery. At least the first portion 31 thereof is wrapped with tab glue 4, which helps to enhance the connection strength between the tab connector 3 and the tab of the battery cell 72 and provides additional insulation protection.

[0112] The tab connection part 3 passes through the through hole 10 of the first cap 1, so that the first part 31 thereof can cover the second area of ​​the first cap 1. On the one hand, it is convenient for the first part 31 of the tab connection part 3 to be arranged at the notch 20 of the insulating rubber layer 2, and on the other hand, the tab glue 4 combines with the insulating rubber layer 2 to increase the sealing area between the first cap 1 and the second cap 5. At the same time, another part of the first part 31 is arranged in the through hole 10, avoiding direct contact between the tab connection part 3 and the first cap 1.

[0113] Therefore, in this embodiment, the first cap 1 and the second cap 5 are firmly sealed together by the combined action of the insulating rubber layer 2 and the ear glue 4. This sealing method not only ensures the insulation and sealing performance inside the battery, but also prevents the intrusion of external substances, thereby improving the safety and reliability of the battery.

[0114] In one embodiment, referring to Figure 3 and Figure 4 The tab connection portion 3 further includes a second portion 32 and a third portion 33 connected to the first portion 31 and located at two ends of the first portion 31;

[0115] The second portion 32 is bent toward the center direction of the cap assembly, and the second portion 32 is connected to the second cap 5;

[0116] The third portion 33 is bent in a direction away from the center of the cap assembly, and the third portion 33 is used to connect with the first pole ear 721 of the battery.

[0117] In this embodiment, the second portion 32 of the pole tab connection portion 3 is connected to the first portion 31 and is bent toward the center of the cap assembly. This design helps save space and makes the pole tab connection portion 3 more compact. The second portion 32 is connected to the second cap 5, which can be achieved by welding, gluing or other methods, to further enhance the overall structural strength of the cap assembly and facilitate the current of the first pole tab 721 to be drawn out through the pole tab connection portion 3 and the second cap 5.

[0118] The third part 33 of the tab connector 3 is also connected to the first part 31, but it is bent in a direction away from the center of the cap assembly. This design makes it easier for the third part 33 to connect to the first tab 721 of the battery. The main function of the third part 33 is to connect to the first tab 721 of the battery to achieve electrical connection between the internal circuit of the battery and the external circuit. This direct connection method ensures the efficiency and stability of current transmission.

[0119] In one embodiment, referring to Figure 3 and Figure 4 , the third portion 33 is wrapped by the tab glue 4 , and at least part of the second portion 32 is wrapped by the tab glue 4 .

[0120] In this embodiment, the third part 33 of the pole lug connection part 3 is wrapped with the pole lug glue 4. For example, most of the surface of the third part 33 of the pole lug connection part 3 is wrapped with the pole lug glue 4. Only the end face of the third part 33 of the pole lug connection part 3 needs to be exposed to facilitate welding of the end face of the third part 33 of the pole lug connection part 3 with the first pole lug 721.

[0121] Wrapping the tab glue 4 on the third portion 33 of the tab connection portion 3 can avoid direct contact between the first cap 1 and the third portion 33 of the tab connection portion 3, thereby directly avoiding short circuit between the positive and negative electrodes inside the battery.

[0122] And the tab glue 4 is wrapped around at least part of the second portion 32 of the tab connection portion 3. For example, the tab glue 4 can be provided at the bending portion of the second portion 32 of the tab connection portion 3 to ensure that it will not be damaged during the bending process.

[0123] In one embodiment, referring to Figure 3 and Figure 4 The cap assembly further includes an insulating film layer 6 , which is sleeved on the tab connecting portion 3 and attached to the lower surface of the first cap 1 .

[0124] In this embodiment, the insulating film layer 6 is attached to the lower surface of the first cap 1, which further enhances the insulation performance of the battery and improves the safety and reliability of the battery.

[0125] In a fourth aspect, an embodiment of the present application further provides a battery, wherein the battery is prepared by the method for preparing the battery as described in the second aspect. The battery has good insulation and sealing properties.

[0126] In a fifth aspect, an embodiment of the present application further provides a battery. The battery comprises a cap assembly as described in the third aspect;

[0127] The battery further comprises a steel shell assembly 7, wherein the steel shell assembly 7 comprises a steel shell 71 and a battery cell 72 disposed in the steel shell 71; the battery cell 72 comprises a first pole ear 721 and a second pole ear 722, wherein the first pole ear 721 is welded to the pole ear connecting portion 3, and the second pole ear 722 is welded to the bottom surface of the steel shell 71;

[0128] The cap assembly is covered on the open end of the steel shell 71 , and the first cap 1 is welded to the steel shell 71 .

[0129] In this embodiment, the use of the insulating glue layer 2 and the tab glue 4 effectively isolates the internal circuit of the battery from the external environment, reducing the risk of short circuit and electric shock. The stable welding between the tab connector 3 and the tab of the battery cell 72 ensures the efficiency and stability of current transmission; at the same time, the welding connection between the first cap 1 and the steel shell 71 also enhances the overall structural strength of the battery.

[0130] In a sixth aspect, an embodiment of the present application further provides an electronic device. The electronic device includes the battery as described in the fourth aspect or the fifth aspect. Exemplarily, the electronic device includes but is not limited to a smart phone, a tablet computer, a smart watch, a headset, etc.

[0131] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0132] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for preparing a cap assembly, characterized in that: The following steps are involved: A first cover cap (1) is provided, wherein the first cover cap (1) is provided with a through hole (10) along a thickness direction thereof; Placing an insulating rubber layer (2) on the first cover cap (1) and covering the first area of ​​the first cover cap (1), wherein the insulating rubber layer (2) is formed with a notch (20), and the notch (20) extends inwardly along the edge of the insulating rubber layer (2); Passing the tab connection portion (3) through the through hole (10), wherein at least a first portion (31) of the tab connection portion (3) is wrapped by the tab glue (4), the first portion (31) is located at the notch (20) and covers a second area of ​​the first cap (1), and the first portion (31) is also located in the through hole (10), and the second area is an area not covered by the insulating glue layer (2); The second cover cap (5) is placed on the insulating rubber layer (2), and the first cover cap (1) and the second cover cap (5) are sealed by heat pressing.

2. The method for preparing the cap assembly according to claim 1, characterized in that: After the first cap (1) and the second cap (5) are sealed, the method further comprises: The second part (32) and the third part (33) connected to the first part (31) are bent, wherein the second part (32) and the third part (33) are located at two ends of the first part (31), the second part (32) is bent toward the center direction of the cap assembly and is located at the second cap (5) for connection, and the third part (33) is bent away from the center direction of the cap assembly.

3. The method for preparing the cap assembly according to claim 2, characterized in that: Before the second part (32) and the third part (33) are bent, the method further comprises: The tab glue (4) is wrapped around the third portion (33), and the tab glue (4) is wrapped around at least a portion of the second portion (32).

4. The method for preparing the cap assembly according to claim 1 or 2, characterized in that: After the first cap (1) and the second cap (5) are sealed, the method further comprises: The insulating film layer (6) is sleeved on the tab connection portion (3) so that the insulating film layer (6) is attached to the lower surface of the first cap (1).

5. The method for preparing the cap assembly according to claim 1, characterized in that: Placing the insulating adhesive layer (2) on the first cover cap (1) specifically includes: the through hole (10) is located within the area defined by the notch (20).

6. A method for preparing a battery, characterized in that: The following steps are involved: Providing a cap assembly, wherein the cap assembly is prepared by the method for preparing a cap assembly according to any one of claims 1 to 5; A steel shell assembly (7) is provided, comprising a steel shell (71) and a battery cell (72) disposed in the steel shell (71), wherein the battery cell (72) comprises a first pole lug (721) and a second pole lug (722), wherein the second pole lug (722) is used for welding to the bottom surface of the steel shell (71); Welding the first pole lug (721) and the pole lug connecting portion (3) together; The first cover cap (1) and the steel shell (71) are welded together.

7. A cap assembly, characterized in that: The cap assembly is prepared by the method for preparing a cap assembly according to any one of claims 1 to 5.

8. The cap assembly according to claim 7, characterized in that: The cap assembly comprises: a first cap (1), an insulating rubber layer (2) and a second cap (5) which are stacked; the first cap (1) is provided with a through hole (10) along its thickness direction, the insulating rubber layer (2) is formed with a notch (20), and the notch (20) is used to expose the second area of ​​the first cap (1); The cap assembly further comprises a tab connection portion (3), at least a first portion (31) of the tab connection portion (3) is wrapped with a tab glue (4), the tab connection portion (3) passes through the through hole (10), so that a portion of the first portion (31) covers the second area, and another portion of the first portion (31) is disposed in the through hole (10); The first cover cap (1) and the second cover cap (5) are sealed and connected via the insulating adhesive layer (2) and the tab adhesive (4).

9. The cap assembly according to claim 8, characterized in that: The tab connection portion (3) further comprises a second portion (32) and a third portion (33) connected to the first portion (31) and located at two ends of the first portion (31); The second portion (32) is bent toward the center direction of the cap assembly, and the second portion (32) is connected to the second cap (5); The third portion (33) is bent in a direction away from the center of the cap assembly, and the third portion (33) is used to connect to the first pole ear (721) of the battery.

10. The cap assembly according to claim 9, characterized in that: The third portion (33) is wrapped by the tab glue (4), and at least part of the second portion (32) is wrapped by the tab glue (4).

11. The cap assembly according to claim 8 or 9, characterized in that: The cap assembly further comprises an insulating film layer (6), wherein the insulating film layer (6) is sleeved on the tab connection portion (3) and attached to the lower surface of the first cap (1).

12. A battery, characterized in that: The battery is prepared by the battery preparation method according to claim 6.

13. A battery, characterized in that: The battery comprises a cap assembly as claimed in any one of claims 7 to 11; The battery further comprises a steel shell assembly (7), wherein the steel shell assembly (7) comprises a steel shell (71) and a battery cell (72) disposed in the steel shell (71); The battery cell (72) comprises a first pole lug (721) and a second pole lug (722), the first pole lug (721) being welded to the pole lug connecting portion (3), and the second pole lug (722) being welded to the bottom surface of the steel shell (71); The cover cap assembly is arranged to cover the open end of the steel shell (71), and the first cover cap (1) is welded to the steel shell (71).

14. An electronic device, characterized in that: The electronic device comprises the battery according to claim 12 or 13.

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