Battery packaging method and battery

Abstract

The method comprises the following steps: step S1, executing a sealing ring and sealing plate assembling operation: arranging a sealing ring on the inner side of a sealing plate, arranging a battery cover on the inner side of the sealing ring in a sealing manner, assembling to form an upper sealing assembly, and arranging the upper sealing assembly on the inner side of a top opening of a battery shell main body; step S2, executing shaping and fixing operation: bending the bending part of the sealing ring and the bending part of the sealing plate towards the direction of the battery cover and compacting to ensure sealing connection; s3, executing a positive collector plate welding operation: welding a positive collector plate with the bottom of the battery cover; and S4, executing sealing plate welding operation: welding the sealing plate welding part with the top opening of the battery shell main body, and ensuring that the sealing plate welding part is in sealed connection with the battery shell main body to obtain the battery with the upper part packaged. According to the method, the safe and reliable battery can be prepared without a complicated rolling deformation step, and the problems of local deformation and stress concentration existing in a traditional channeling process can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery packaging method and a battery. Background Technology

[0002] Currently, in the production process of cylindrical batteries, the sealing (encapsulation) is often carried out by grooving.

[0003] The basic principle of groove sealing is as follows: an annular groove is formed at the end of the battery casing through mechanical rolling. The groove and the top cover mechanically interlock and cooperate with the sealing ring to achieve an airtight seal. The core of groove sealing is to lock the top cover and battery casing together through plastic deformation and rely on sealing material to fill the gap to prevent leakage.

[0004] For the grooving and sealing process of cylindrical batteries, aluminum alloy or nickel-plated steel with excellent ductility is typically selected as the battery casing. The ends of the battery casing are pre-reduced using a CNC machine tool, precisely reducing the diameter by 0.1-0.3mm to form a guiding structure, ensuring accurate positioning of the subsequent top cover assembly. Required components include: the top cover assembly and electrolyte-resistant fluororubber sealing rings; the sealing rings need to be vacuum-adsorbed and assembled into the grooves of the top cover. The grooving stage uses a grooving machine, with carbide rollers applying progressive pressure along the circumference of the battery casing using a V-shaped cutting edge, typically forming grooves 0.8-1.5mm wide and 0.3-0.4mm deep.

[0005] The existing traditional grooving sealing method has the following technical defects:

[0006] 1. Risk of stress concentration: Local deformation at the grooves of the battery casing may create stress concentration points. When subjected to long-term vibration or impact, fatigue cracks are likely to occur, affecting battery life.

[0007] 2. Sealing depends on auxiliary materials: Grooves often require the use of sealing rings or adhesives. If the auxiliary materials age or fail, it may lead to leakage or a decrease in airtightness.

[0008] 3. Increased local thermal resistance: Structural changes at the groove may cause heat to accumulate in the groove area, affecting the overall heat dissipation efficiency of the battery, especially in high temperature or high rate charging and discharging scenarios.

[0009] 4. Poor applicability: Conventional 21 and 18 batteries (i.e., batteries with diameters of 21mm and 18mm) can be used with the grooving process, but when the diameter of cylindrical batteries increases (e.g., the 46 series large cylindrical batteries, i.e., batteries with a diameter of 46mm), the sealing performance of the grooving will be greatly reduced.

[0010] 5. Potential deformation issues: If the rolling process is not properly controlled, it may cause slight deformation of the battery casing, affecting the alignment of the internal electrodes or the distribution of the electrolyte.

[0011] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0012] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a battery packaging method and a battery.

[0013] Therefore, the present invention provides a battery packaging method, comprising the following steps:

[0014] Step S1, perform the sealing ring and sealing plate assembly operation: set the sealing ring inside the hollow sealing plate, and seal the battery cover inside the sealing ring to form the upper sealing assembly; then set the upper sealing assembly inside the top opening of the battery case body.

[0015] Step S2, perform shaping and fixing operation: bend the bend of the sealing ring and the bend of the sealing plate 3000 together toward the battery cover and press them together to ensure that after pressing, the bend of the sealing ring is tightly attached to the top of the battery cover, and the bend of the sealing ring, the bend of the sealing plate and the battery cover are in a sealed connection state.

[0016] Step S3, perform positive current collector welding operation: weld the positive current collector to the bottom of the battery cover;

[0017] Step S4, perform sealing plate welding operation: weld the sealing plate welding part of the sealing plate to the top opening of the battery case body, and ensure that the sealing plate welding part and the battery case body are in a sealed connection state after the welding is completed, to obtain the battery with the upper part fully encapsulated.

[0018] In addition, the present invention also provides a battery prepared using the battery encapsulation method described above.

[0019] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides a battery packaging method and battery with a scientific design. The present invention can prepare a safe and reliable battery without complicated rolling deformation steps, which can effectively avoid the problems of local deformation and stress concentration in traditional rolling processes, reduce the risk of fatigue cracking during long-term use, and thus avoid the generation of metal chips, which has great practical significance.

[0020] Furthermore, by applying this invention, the battery manufacturing process steps are significantly reduced, resulting in higher battery production efficiency. The sealing structure of this invention, formed by stamping, replaces the original grooved structure, improving consistency and long-term sealing stability, making it particularly suitable for high-voltage or high-energy-density batteries. The battery encapsulation method of this invention has strong applicability and can be applied to cylindrical batteries of various diameters.

[0021] In addition, the battery packaging method of the present invention adopts the bottom center port liquid injection mode, which is beneficial to reserve a larger welding area and facilitate the connection between the battery and the external electrical load. Attached Figure Description

[0022] Figure 1 A basic flowchart of a battery packaging method provided by the present invention;

[0023] Figure 2 This is a top cross-sectional view of the battery casing after the sealing ring and sealing plate are assembled in step S1, based on the battery packaging method provided by the present invention.

[0024] Figure 3 The battery encapsulation method provided by the present invention includes the assembly of the sealing ring and the sealing plate in step S1, and the bending and compaction of the bent portion of the sealing ring and the sealing plate in step S2, which is the upper cross-sectional view of the battery casing.

[0025] Figure 4 This is a schematic diagram of the overall structure of a battery prepared based on the battery packaging method provided by the present invention.

[0026] Figure 5 A bottom view of a battery prepared based on the battery packaging method provided by the present invention;

[0027] In the picture, 1000 is the battery cover;

[0028] 2000 - Sealing ring, 2001 - Sealing ring bend, 2002 - Sealing ring support.

[0029] 3000 - Sealing plate, 3001 - Sealing plate bending part, 3002 - Sealing plate support part, 3003 - Sealing plate welding part;

[0030] 4000 - Positive current collector; 5000 - Battery casing body; 6000 - Gasket; 7000 - Sealing pin;

[0031] 8000 - Bottom weld joint. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] See Figures 1 to 5 This invention provides a battery packaging method, comprising the following steps:

[0037] Step S1, perform the assembly operation of sealing ring 2000 and sealing plate 3000: See Figure 2 As shown, a sealing ring 2000 is provided inside the hollow sealing plate 3000, and a battery cover 1000 is sealed inside the sealing ring 2000 to form an upper sealing assembly; then the upper sealing assembly is placed inside the top opening of the battery case body 5000.

[0038] In step S1, it should be noted that existing conventional battery assembly fixtures are used to assemble the sealing ring 2000, the sealing plate 3000, and the battery cover 1000. Figure 2 The assembly is performed in a specific manner. After assembly, it is placed on the battery casing body 5000.

[0039] In this invention, specifically, an annular gasket 6000 is provided at the bottom of the sealing plate 3000;

[0040] The bottom of the battery cover 1000 is equipped with a positive current collector 4000.

[0041] In this invention, specifically, the sealing plate 3000 includes a sealing plate bending portion 3001, a sealing plate supporting portion 3002, and a sealing plate welding portion 3003 distributed around the perimeter.

[0042] A sealing plate bending part 3001 is provided on the top inner end of the annular sealing plate support part 3002;

[0043] A sealing plate welding part 3003 is provided around the lower circumferential outer end of the sealing plate support part 3002;

[0044] It should be noted that, in this invention, the sealing plate 3000, which plays a sealing role, is made of a flexible material, preferably aluminum or stainless steel.

[0045] In this invention, specifically, the sealing ring 2000 includes a sealing ring bending portion 2001 and a sealing ring supporting portion 2002;

[0046] The circumferentially distributed sealing ring bend 2001 is located on top of the circumferentially distributed sealing ring support 2002;

[0047] The inner and outer sides of the sealing ring bend 2001 are in contact with the outer circumferential side of the battery cover 1000 and the sealing plate bend 3001 in the sealing plate 3000, respectively.

[0048] It should be noted that, in this invention, the sealing ring 2000 performs its sealing function and is made of a flexible material, such as PBT (polybutylene terephthalate), which has strong resistance to electrolyte corrosion, high thermal stability, and high safety. It is easy to process and is commonly used for battery sealing. The material used for the sealing ring needs to possess all of the above properties.

[0049] Step S2, perform the shaping and fixing operation: see Figure 3 As shown, the sealing ring 2000's bent portion 2001 and the sealing plate 3000's bent portion 3001 are bent together toward the battery cover 1000 and pressed firmly, ensuring that after pressing, the sealing ring bent portion 2001 is tightly attached to the top of the battery cover 1000, and the sealing ring bent portion 2001, the sealing plate bent portion 3001 and the battery cover 1000 are in a sealed connection state (i.e., no air or liquid leakage).

[0050] Step S3, perform the positive current collector 4000 welding operation: weld the positive current collector 4000 to the bottom of the battery cover 1000;

[0051] Step S4, perform the sealing plate 3000 welding operation: weld the sealing plate welding part 3003 of the sealing plate 3000 to the top opening of the battery case body 5000, and ensure that the sealing plate welding part 3003 and the battery case body 5000 are in a sealed connection state (i.e. no air or liquid leakage) after the welding is completed, and obtain the battery with the upper part fully encapsulated.

[0052] Step S5, perform bottom welding operation: weld the bottom shell of the battery case body 5000 to the core inside the battery case body 5000;

[0053] In step S5, in specific implementation, depending on the different forms of the battery cell (using a busbar output or a tab output), different welding methods with mature existing technologies can be used (such as conventional ultrasonic welding methods or laser welding methods).

[0054] Step S6: Perform liquid injection and liquid injection port sealing operation: inject liquid into the liquid injection port located at the center of the bottom shell of the battery casing 5000, and seal the liquid injection port by welding using sealing nails 7000 after liquid injection, thereby obtaining the finished battery with the encapsulation operation completed.

[0055] In this invention, specifically, the bottom shell of the battery casing body 5000 and the winding core inside the battery casing body 5000 are welded together to form multiple (e.g., three) bottom weld points 8000;

[0056] The distribution shape (i.e. welding trajectory) of each bottom weld point (8000) is an arc shape.

[0057] In practice, the multiple arc-shaped bottom weld points 8000 have equal radii and the corresponding center positions are the same. That is, they are located on the same circle.

[0058] In this invention, it should be noted that the structural design of the battery cover 1000 and the gasket 6000 is a conventional design that is well-known and technically mature, and will not be described in detail here.

[0059] Based on the battery packaging method provided by the present invention, the present invention also provides a battery, which is prepared by the battery packaging method described above.

[0060] In specific implementation, the battery of the present invention specifically includes: a battery prepared by steps S1 to S4, and a battery prepared by steps S1 to S6.

[0061] In summary, compared with the prior art, the present invention provides a battery packaging method and battery with a scientific design. The present invention can produce a safe and reliable battery without complicated rolling deformation steps. It can effectively avoid the local deformation and stress concentration problems of traditional rolling processes, reduce the risk of fatigue cracking during long-term use, and thus avoid the generation of metal chips, which has great practical significance.

[0062] Furthermore, by applying this invention, the battery manufacturing process steps are significantly reduced, resulting in higher battery production efficiency. The sealing structure of this invention, formed by stamping, replaces the original grooved structure, improving consistency and long-term sealing stability, making it particularly suitable for high-voltage or high-energy-density batteries. The battery encapsulation method of this invention has strong applicability and can be applied to cylindrical batteries of various diameters.

[0063] In addition, the battery packaging method of the present invention adopts the bottom center port liquid injection mode, which is beneficial to reserve a larger welding area and facilitate the connection between the battery and the external electrical load.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery packaging method, characterized by, The method comprises the following steps: Step S1, performing sealing ring (2000) and sealing plate (3000) assembly operation: setting sealing ring (2000) inside the hollow sealing plate (3000), and sealingly setting battery cover (1000) inside the sealing ring (2000), assembling to form an upper sealing assembly; then setting the upper sealing assembly inside the top opening of the battery shell body (5000); Step S2, performing shaping and fixing operation: bending and compacting the sealing ring bending part (2001) of the sealing ring (2000) together with the sealing plate bending part (3001) of the sealing plate (3000) to the direction of the battery cover (1000), ensuring that the sealing ring bending part (2001) is tightly attached to the top of the battery cover (1000) after compaction, and the sealing ring bending part (2001), the sealing plate bending part (3001) and the battery cover (1000) are in a sealed connection state; Step S3, performing positive electrode current collector plate (4000) welding operation: welding the positive electrode current collector plate (4000) with the bottom of the battery cover (1000); Step S4, performing sealing plate (3000) welding operation: welding the sealing plate welding part (3003) of the sealing plate (3000) with the top opening of the battery shell body (5000), and ensuring that the sealing plate welding part (3003) and the battery shell body (5000) are in a sealed connection state after welding, to obtain a battery with upper completed packaging.

2. The battery packaging method of claim 1, wherein, Further comprising the following steps: Step S5, performing bottom welding operation: welding the bottom shell of the battery shell body (5000) with the roll core inside the battery shell body (5000); Step S6, performing liquid injection and liquid injection port sealing operation: injecting liquid from the liquid injection port at the center of the bottom shell of the battery shell body (5000), and sealing the liquid injection port by welding using the sealing nail (7000) after the liquid injection is completed, thereby obtaining a finished product battery with completed packaging operation.

3. The battery packaging method of claim 1, wherein, The bottom of the sealing plate (3000) is provided with an annular gasket (6000); The bottom of the battery cover (1000) is provided with a positive electrode current collector plate (4000).

4. The battery packaging method of claim 1, wherein, The sealing plate (3000) comprises a sealing plate bending part (3001), a sealing plate supporting part (3002) and a sealing plate welding part (3003) distributed around; The top inside end of the annular sealing plate supporting part (3002) is provided with the sealing plate bending part (3001); The circumferential outside end of the lower part of the sealing plate supporting part (3002) is provided with the sealing plate welding part (3003) around.

5. The battery packaging method of claim 4, wherein, The material of the sealing plate (300) is aluminum or stainless steel.

6. The battery packaging method of claim 1, wherein, The sealing ring (2000) comprises a sealing ring bending part (2001) and a sealing ring supporting part (2002); The circumferentially distributed sealing ring bending part (2001) is located at the top of the circumferentially distributed sealing ring supporting part (2002); The inner and outer sides of the sealing ring bending part (2001) are respectively in contact with the circumferential outside of the battery cover (1000) and the sealing plate bending part (3001) in the sealing plate (300).

7. The battery packaging method according to any one of claims 1 to 6, wherein, A plurality of bottom welding points (8000) are formed by welding between the bottom shell of the battery shell body (5000) and the roll core inside the battery shell body (5000); The distribution shape of each bottom welding point (8000) is a circular arc shape.

8. The battery packaging method of claim 7, wherein, The radii of the plurality of circular arc-shaped bottom welding points (8000) are equal, and the corresponding center positions are the same.

9. A battery, characterized by Obtained by using the battery packaging method according to any one of claims 1 to 8.

10. The battery of claim 9, wherein the electrolyte comprises a lithium salt. The battery is a cylindrical battery.

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