Lithium battery cover, lithium battery, and method for fixing winding core of lithium battery cover

Abstract

The application relates to the technical field of batteries, and provides a lithium battery cover plate, a lithium battery and a method for fixing a winding core of a lithium battery cover plate. The lithium battery cover plate comprises a cover plate body and an elastic sealing ring assembled with the cover plate body in an integrated mode, the cover plate body is used for covering a shell, and a boss is arranged at a lower surface of the elastic sealing ring close to an outer periphery. The boss can play a buffering role on the winding core when the winding core is subjected to up-down vibration, and the winding core is further protected. Meanwhile, the welding points between the winding core and the current collecting disc can be prevented from being torn, and the tightness of the connection between the winding core and the current collecting disc is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a lithium battery cover, a lithium battery, and a method for fixing a winding core of a lithium battery cover. Background Art

[0002] The lithium battery cover is a core component in new energy vehicles. Its main function is to reduce overcurrent and the probability of the flip plate being melted, thereby reducing the risk of power battery fire and explosion.

[0003] In existing cylindrical steel-cased lithium-ion batteries with full-tab structures, the bottom of the cover plate presses down on the tab to prevent rigid contact between the cover plate and the collector plate. This can cause material to fall off at the base of the tab, potentially piercing the diaphragm and causing internal short circuits, or material falling off and causing self-discharge, a significant safety risk. To mitigate this risk, a certain gap is typically left between the cover plate and the collector plate. When the battery cell vibrates during operation, the core can move up and down due to a loose core winding, potentially causing the welds between the core and the collector plate to tear, increasing internal resistance and risking excessive temperature rise. Summary of the Invention

[0004] The present invention provides a lithium battery cover plate, which is used to solve the defects in the prior art that the vibration of the battery cell during operation causes the welding point between the winding core and the current collecting disk to tear, thereby causing increased internal resistance and excessive temperature rise. When the winding core vibrates, the welding point between the winding core and the current collecting disk can be ensured not to tear.

[0005] The present invention provides a lithium battery cover plate, comprising:

[0006] a cover body, used to cover the housing; and

[0007] An elastic sealing ring is assembled integrally with the cover plate body, and a boss is provided on the lower surface of the elastic sealing ring near the outer periphery.

[0008] In an embodiment of the present invention, when securing the core, the annular boss is relatively protruding, so the bottom of the annular boss first contacts the current collecting plate on the core. While squeezing the collecting plate, the annular boss also prevents other rigid components on the cover plate from squeezing the collecting plate, thereby effectively protecting the collecting plate. Furthermore, the annular boss and the elastic sealing ring form a structure that is thin in the middle and thick at the periphery. A hole is provided in the center of the thinner area of ​​the elastic sealing ring, which is used to fit the sealing ring over the cover plate rivet. Since the cover plate rivet is embedded in the cover plate body, the cover plate body, rivet, and elastic sealing ring are assembled as a single unit, making it easy to disassemble and install. To secure the core, only the cover plate needs to be manipulated, eliminating the tedious process of assembling the sealing ring and the cover plate body, greatly improving assembly and disassembly efficiency. Furthermore, when assembling the cover plate, interference with the core inside the housing is inevitable, causing the core to wobble up and down. In this case, the cover plate can simply be used to press the core with appropriate pressure. Because the annular boss is elastic, it compresses the core and maintains flexible contact with it. Therefore, it acts as a buffer when the core vibrates up and down, further protecting the core. Finally, because the boss is elastic, when the core vibrates after the cover is installed, it acts as a buffer, thus preventing the weld between the core and the collector tray from tearing, ensuring a tight connection between the core and the collector tray.

[0009] According to a lithium battery cover provided by the present invention, a plurality of air chamber holes are provided on the boss in a circular array with the center of the sealing ring as the center.

[0010] In this embodiment, when the battery cell is charged or discharged, gas is generated inside the cell. If the internal space of the battery is too small, there is no room for the gas to be stored, and the gas pressure inside the battery will increase. In serious cases, it may cause the battery shell to bulge or the battery pressure relief device to rupture, resulting in battery failure. However, the above structure can increase the internal space of the battery, thereby alleviating the internal pressure of the battery to a certain extent and improving battery performance.

[0011] According to a lithium battery cover provided by the present invention, a plurality of gaps are provided between two adjacent air chamber holes along the radial direction of the boss;

[0012] One end of the gap extends to the inner circumference of the boss, and the other end is located at a point outside the periphery of the boss.

[0013] In this embodiment, after the battery cover is assembled, the rivets need to be pulled to seal the cover. Pulling the rivets will cause the positive current collector to move upward, damaging the welds between the positive current collector and the winding core, and in severe cases, tearing the welds between the positive current collector and the winding core. However, with the above-described structure, the flexible areas act as a buffer against the upward pulling force of the rivets during sealing, thereby preventing the welds between the positive current collector and the winding core from tearing.

[0014] According to a lithium battery cover provided by the present invention, the elastic sealing ring is circular in shape.

[0015] According to a lithium battery cover provided by the present invention, the elastic sealing ring is made of silicone.

[0016] In this embodiment, silicone rubber is heat-resistant: it has an applicable temperature range of -40 to 230 degrees Celsius, does not harden at low temperatures, does not melt at high temperatures, and produces no toxic substances. Silicone rubber also has a high resistivity, and its resistance remains stable over a wide temperature and frequency range. Silicone rubber is also highly resistant to high-voltage corona discharge and arc discharge. Importantly, silicone rubber has excellent elasticity, which protects the winding core.

[0017] According to a lithium battery cover provided by the present invention, the air chamber hole is fan-shaped.

[0018] In this embodiment, a fan-shaped structure is adopted. On the one hand, the fan-shaped structure can be well matched with the circular sealing ring while ensuring a certain aesthetics. On the other hand, the fan-shaped structure can maximize the area of ​​the battery cell gas chamber, thereby maximizing the gas capacity inside the battery, extending the battery life and improving the battery performance to a certain extent.

[0019] According to a lithium battery cover provided by the present invention, a cover rivet is embedded in the middle of the cover body;

[0020] A pull rivet is provided inside the cover rivet;

[0021] A gap is left between the cover plate rivet and the pull rivet.

[0022] During the winding core securing process, after the winding core is welded within the battery housing, the lithium battery cover is secured to it. Once secured, the battery cell needs to be injected with liquid. At this point, the battery is already sealed, requiring a through-hole connecting the interior and exterior of the battery. After injection, the battery needs to be further sealed. Rivets meet both of these requirements. First, a through-hole is provided in the center of the rivet. Once the battery cover is welded, the battery cell can be injected with liquid through this hole. Once injection is complete, the rivet is then used to seal the battery housing. A gap is left between the cover rivet and the rivet. This provides space for subsequent rivet sealing and facilitates the connection of the positive current collector to the cover. When securing the cover, the raised portion of the positive current collector fits into the gap between the cover rivet and the rivet. The rivet is then pulled to connect the positive current collector to the cover.

[0023] According to a lithium battery cover provided by the present invention, an injection-molded sealing ring is provided between the cover rivet and the cover body.

[0024] A lithium battery, comprising: a shell;

[0025] The lithium battery cover plate as described above is welded to the top of the shell; and

[0026] The winding core is arranged inside the shell and the top is covered by the lithium battery cover. The upper and lower ends of the winding core are respectively welded with a positive current collecting disc and a negative current collecting disc. The negative current collecting disc is welded to the bottom of the shell, and the positive current collecting disc is connected to the lithium battery cover.

[0027] This lithium battery cover is equipped with an elastic sealing ring with a boss at its base. When securing the winding core, the boss first contacts the core. Due to its elasticity, it provides a cushioning effect for the core. Furthermore, since the boss first contacts the core, it prevents contact between other rigid components of the cover and the core, preventing damage to the core. This provides a certain degree of protection for the core. Furthermore, the elastic sealing ring is integrally assembled with the cover body, making it more convenient and quick to secure the core using this lithium battery cover. After assembling the battery cover, a rivet is pulled to seal the cover. Pulling the rivet causes the positive current collector plate to move upward, damaging the weld between the positive current collector plate and the winding core, and in severe cases, tearing the weld between the positive current collector plate and the winding core. With this structure, several flexible areas cushion the upward force of the rivet during sealing, preventing the weld between the positive current collector plate and the winding core from tearing.

[0028] A method for fixing a winding core of a lithium battery cover plate comprises the following steps:

[0029] S1: Welding the positive electrode current collecting disc and the negative electrode current collecting disc to the upper and lower ends of the winding core respectively;

[0030] S2: Assembling the whole welded in step S1 into the interior of the shell, so that the negative electrode current collecting plate is welded to the bottom end of the shell;

[0031] S3: Assembling the lithium battery cover plate to the top of the winding core so that the raised portion of the positive electrode current collecting disc is located in the gap between the cover plate rivet and the pull rivet, and at the same time, the boss of the elastic sealing ring and the flat portion of the positive electrode current collecting disc are in contact with each other and generate a force;

[0032] S4: Welding the lithium battery cover plate to the housing;

[0033] S5: Inject the battery liquid from the hole in the middle of the rivet;

[0034] S6: Use rivets to seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 is a cross-sectional view of the lithium battery cover provided by the present invention;

[0037] Figure 2 This is a cross-sectional view of the assembled lithium battery cover and housing provided by the present invention;

[0038] Figure 3 is a top view of the elastic sealing ring provided by the present invention;

[0039] Figure 4 The present invention provides Figure 3 Cross-sectional view along the AA direction.

[0040] Reference numerals:

[0041] 1: rivet; 2: cover rivet; 3: cover body; 4: injection-molded sealing ring; 5: elastic sealing ring; 6: positive electrode current collecting plate; 7: winding core; 8: shell; 9: air chamber hole; 10: gap. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly illustrating the product components and do not represent any substantial difference. The directions of "up" and "down" shall be based on the directions shown in the accompanying drawings. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. In the specification and claims, "and / or" means at least one of the connected objects, and the character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0045] The invention provides a lithium battery cover plate.

[0046] like Figure 1 As shown, in an embodiment of the present invention, the lithium battery cover includes: a cover body 3 for covering the housing 8; and an elastic sealing ring 5 integrally assembled with the cover body 3. The elastic sealing ring 5 has a boss on its lower surface near the periphery. The boss can be an annular structure. When the boss is annular, the annular boss is coaxial with the sealing ring and is located on the outside of the bottom of the sealing ring. The annular boss is part of the elastic sealing ring 5, so both are made of the same material and are elastic.

[0047] According to the above structure, when the winding core 7 is fixed, since the annular boss is relatively protruding, the bottom of the annular boss first contacts the collecting disk on the winding core 7. While the annular boss plays the role of squeezing the collecting disk, it also avoids the squeezing of the collecting disk by other rigid components on the cover plate, thereby well protecting the collecting disk. In addition, the annular boss and the elastic sealing ring 5 form a structure that is thin in the middle and thick on the periphery, and a sleeve hole is provided in the middle of the thin area of ​​the elastic sealing ring 5. The function of the hole is to put the sealing ring on the cover plate rivet 2. Since the cover plate rivet 2 is embedded in the cover plate body 3, the cover plate body 3, the rivet and the elastic sealing ring 5 are assembled as one, which is convenient for disassembly and installation. When fixing the winding core 7, it is only necessary to operate the cover plate, avoiding the tedious procedure of assembling the sealing ring and the cover plate body 3, and greatly improving the work efficiency of assembly and disassembly. Furthermore, when assembling the cover plate, it will inevitably interfere with the core 7 inside the shell 8, causing the core 7 to shake up and down. In this case, it is only necessary to press the core 7 with appropriate pressure through the cover plate. Because the annular boss is elastic and presses the core 7 tightly, while also making flexible contact with the core 7, it acts as a buffer when the core 7 vibrates up and down, further protecting the core 7. Finally, because the boss is elastic, after the cover plate is installed, when the core 7 vibrates, the boss acts as a buffer, thereby ensuring that the weld between the core 7 and the collecting plate will not be torn, ensuring the tightness of the connection between the core 7 and the collecting plate.

[0048] It will be appreciated that in this embodiment, the shape and number of the bosses are not limited to a single ring; one or more bosses of other shapes are also acceptable, as long as they align with the position of the positive electrode current collecting disc 6 when assembled on the cover plate, with the bottom surface of the entire assembly lying on the same plane and protruding further from the other components of the cover plate. For example, several small bosses, such as circular, triangular, or square, can be arranged in a circular array on the bottom of the sealing ring.

[0049] Reference Figure 1-Figure 4 In some embodiments of the present invention, the boss is provided with a plurality of air chamber holes arranged in a circular array centered around the center of the sealing ring. When the cover plate is assembled, these air chamber holes can be used as the battery cell air chamber, further expanding the space inside the battery.

[0050] When a battery cell is charged or discharged, gas is generated inside the cell. If the internal space of the battery is too small, there is no room for the gas to accumulate, and the gas pressure inside the battery will increase. In severe cases, it may cause the battery shell to bulge or the battery pressure relief device to rupture, resulting in battery failure. The above structure can increase the internal space of the battery, thereby alleviating the internal pressure of the battery to a certain extent and improving battery performance.

[0051] It is understood that the number of the pores can be any number such as 3, 4, 5, 6, 7, or 8. The specific number can be set according to actual conditions and will not be elaborated here. At the same time, the size of the pores can also be set according to actual conditions, as long as the pores are evenly spaced.

[0052] Reference Figure 3 In some embodiments of the present invention, a plurality of gaps 10 are defined radially along the boss between adjacent air chamber holes 9. One end of each gap 10 extends to the inner edge of the boss, while the other end is located at a point on the outer periphery of the boss. These gaps 10 divide the inner opening of the elastic sealing ring 5 into several flexible zones.

[0053] After the battery cover is assembled, the rivet 1 needs to be pulled to seal it. Pulling the rivet 1 will cause the positive current collector plate to move upward, thereby damaging the weld between the positive current collector plate and the winding core 7, and in severe cases, causing the weld between the positive current collector plate and the winding core 7 to tear. With the above structure, the several flexible areas have a buffering effect on the upward pulling force of the rivet 1 during sealing, thereby preventing the weld between the positive current collector plate 6 and the winding core 7 from tearing.

[0054] It is understandable that the number of gaps 10 between the air chamber holes 9 can be various, such as 1, 2 or 3, and can be set according to actual conditions, which will not be elaborated here.

[0055] Reference Figure 3 In some embodiments of the present invention, the elastic sealing ring 5 is circular in shape.

[0056] It is understandable that the shape of the elastic sealing ring 5 is not limited to a circle. Its shape only needs to be compatible with the shape of the cover body 3 and can be matched according to the actual shape of the cover body 3 .

[0057] In some embodiments of the present invention, the elastic sealing ring 5 is made of silicone.

[0058] Silicone rubber is heat-resistant: it operates within a temperature range of -40 to 230 degrees Celsius, does not harden at low temperatures, does not melt at high temperatures, and produces no toxic substances. Silicone rubber also has a high resistivity, and its resistance remains stable over a wide temperature and frequency range. Silicone rubber is also highly resistant to high-voltage corona and arc discharges. Importantly, silicone rubber possesses excellent elasticity, which protects the winding core 7.

[0059] It is understandable that the material of the elastic sealing ring 5 can also be vulcanized rubber, TPV injection molding material, etc.

[0060] Reference Figure 3In some embodiments of the present application, the air chamber hole 9 is shaped as a sector.

[0061] With the sector shape, on the one hand, the sector can be well matched with the circular sealing ring while ensuring a certain aesthetic appearance, and on the other hand, the sector can maximize the expansion of the air chamber area of the battery cell, thereby maximizing the air capacity inside the battery, to a certain extent, prolonging the life of the battery and improving the performance of the battery.

[0062] It can be understood that the shape of the air chamber hole 9 is not limited to a sector, but can be a circle, a square, a rectangle, a triangle, or other shapes.

[0063] Referring to Figure 1 and Figure 2 In some embodiments of the present application, the middle of the cover plate body 3 is inlaid with a cover plate rivet 2; the inside of the cover plate rivet 2 is provided with a pull rivet 1;

[0064] During the fixing process of the winding core 7, after the winding core 7 is welded in the shell 8, the lithium battery cover plate is fixed, and after being fixed, the inside of the shell 8 needs to be injected with the cell liquid, and at this time the battery has been sealed, so a through hole for connecting the inside and outside of the battery is needed, and after the cell liquid injection is completed, the battery needs to be further sealed. The pull rivet 1 meets the above two requirements. First, the middle of the pull rivet 1 is provided with a through hole, and after the battery cover plate is welded, the cell liquid can be injected into the inside of the battery shell 8 through the hole, and after the cell liquid is injected, the pull rivet 1 is sealed.

[0065] Further, a gap is left between the cover plate rivet 2 and the pull rivet 1.

[0066] Leaving a gap between the cover plate rivet 2 and the pull rivet 1, on the one hand, provides an operable space for subsequent sealing of the pull rivet 1, and on the other hand, facilitates the connection of the positive current collector 6 and the cover plate. When the cover plate is fixed, the protruding part of the positive current collector 6 needs to be clamped in the gap between the cover plate rivet 2 and the pull rivet 1. Then the positive current collector 6 is connected with the cover plate by pulling the pull rivet 1.

[0067] In some embodiments of the present application, an injection sealing ring 4 is arranged between the cover plate rivet and the cover plate body.

[0068] The present application provides a lithium battery.

[0069] In some embodiments of the present application, the lithium battery comprises a shell 8;

[0070] The lithium battery cover plate described above is welded on the top of the shell 8; and

[0071] The core 7 is arranged in the inside of the shell 8 and the top is covered by the lithium battery cover plate, the upper and lower ends of the core 7 are welded with the positive current collector disc 6 and the negative current collector disc respectively, the negative current collector disc is welded with the bottom of the shell, and the positive current collector disc 6 is connected with the lithium battery cover plate.

[0072] The lithium battery cover plate is provided with the elastic sealing ring 5, the bottom of the elastic sealing ring 5 is provided with the boss, the boss is first contacted with the core 7 when the core 7 is fixed, the boss has elasticity, so that the core 7 can be buffered to a certain extent. At the same time, since the boss is first contacted with the core 7, the contact between other rigid parts of the cover plate and the core 7 is avoided, and the damage of other rigid parts to the core 7 is avoided. The core 7 is protected to a certain extent. At the same time, the elastic sealing ring 5 is assembled with the cover plate body 3, so that when the lithium battery cover plate is used to fix the core 7, it is more convenient and fast. When the battery cover plate is assembled, the pull rivet 1 needs to be pulled to seal, when the pull rivet 1 is pulled, the positive current collector plate will move upward, thereby damaging the welding point between the positive current collector plate and the core 7, and seriously tearing the welding point between the positive current collector plate and the core 7. After using the above structure, when the mouth is pulled, the upward tension of the pull rivet 1 is buffered by the flexible area, thereby preventing the welding point between the positive current collector disc 6 and the core 7 from being torn.

[0073] The application provides a method for fixing a core of a lithium battery cover plate.

[0074] In some embodiments of the application, the method comprises the following steps:

[0075] S1: welding the positive current collector disc 6 and the negative current collector disc to the upper and lower ends of the core 7 respectively;

[0076] S2: assembling the whole welded in step S1 to the inside of the shell 8, so that the negative current collector disc is welded with the bottom end inside the shell 8;

[0077] It should be noted that when the above whole is welded, the positive current collector disc 6 is upward, the negative current collector disc is downward, and the whole is vertically placed. Then the negative current collector disc is welded with the bottom of the shell 8, so that the above whole is vertically installed in the middle of the inside of the shell 8.

[0078] S3: assembling the lithium battery cover plate to the top end of the core 7, so that the convex part of the positive current collector disc 6 is located in the gap between the cover plate rivet 2 and the pull rivet 1, and the boss of the elastic sealing ring 5 is in contact with the flat part of the positive current collector disc 6 and generates a force;

[0079] The contact between the boss and the positive current collector disc 6 and the generated force ensure that the cover plate is tightly fixed to the core 7. At the same time, the elastic sealing ring 5 can play a certain damping effect.

[0080] S4: welding the lithium battery cover plate with the shell 8;

[0081] When welding, it is necessary to ensure that the convex platform of the sealing ring is in contact with the flat part of the positive current collector plate.

[0082] S5: injecting the cell liquid into the shell 8 through the hole in the middle of the pull rivet 1;

[0083] S6: sealing by the pull rivet 1.

[0084] When pulling the pull rivet 1, the cover plate needs to be applied with opposite pressure to prevent the welding point between the cover plate and the shell 8 from being torn.

[0085] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature can be "below", "under" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0086] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0087] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium battery cover, characterized in that: include: a cover body, used to cover the shell; and an elastic sealing ring integrally assembled with the cover body, wherein a boss is provided on the lower surface of the elastic sealing ring near the outer periphery; The boss is provided with a plurality of air chamber holes in a circular array with the center of the sealing ring as the center; A plurality of gaps are provided between two adjacent air chamber holes along the radial direction of the boss; One end of the gap extends to the inner edge of the boss, and the other end is located at a point on the outer periphery of the boss; A cover rivet is embedded in the middle of the cover body; A pull rivet is provided inside the cover rivet; A gap is left between the cover plate rivet and the pull rivet.

2. The lithium battery cover according to claim 1, wherein: The elastic sealing ring is circular in shape.

3. The lithium battery cover according to claim 1 or 2, characterized in that: The elastic sealing ring is made of silicone.

4. The lithium battery cover according to claim 1, wherein: The shape of the air chamber hole is fan-shaped.

5. The lithium battery cover according to claim 1, wherein: An injection-molded sealing ring is provided between the cover plate rivet and the cover plate body.

6. A lithium battery, characterized in that: include: case; The lithium battery cover plate according to any one of claims 1, 2, 4, and 5, wherein the lithium battery cover plate is welded to the top of the shell; as well as The winding core is arranged inside the shell and the top is covered by the lithium battery cover. The upper and lower ends of the winding core are respectively welded with a positive current collecting disc and a negative current collecting disc. The negative current collecting disc is welded to the bottom of the shell, and the positive current collecting disc is connected to the lithium battery cover.

7. A method for fixing a winding core of a lithium battery cover, characterized in that: The lithium battery cover according to any one of claims 1 to 5 is implemented, comprising the following steps: S1: Welding the positive electrode current collecting disc and the negative electrode current collecting disc to the upper and lower ends of the winding core respectively; S2: Assembling the whole body welded in step S1 into the interior of the shell, so that the negative electrode current collecting plate is welded to the bottom end of the interior of the shell; S3: Assembling the lithium battery cover plate to the top of the winding core so that the raised portion of the positive electrode current collecting disc is located in the gap between the cover plate rivet and the pull rivet, and at the same time, the boss of the elastic sealing ring and the flat portion of the positive electrode current collecting disc are in contact with each other and generate a force; S4: Welding the lithium battery cover plate to the housing; S5: injecting battery liquid into the shell through the hole in the middle of the rivet; S6: Use rivets to seal.

Images