Lithium ion battery and electronic product

Abstract

The utility model relates to the field of lithium ion batteries, and discloses a lithium ion battery and an electronic product. The lithium ion battery comprises an integrated steel shell, the integrated steel shell comprises a shell opening, a side wall surrounding the shell opening and a shell bottom right opposite to the shell opening, a first annular step is arranged on the side, close to the shell opening, of the inner wall of the side wall, the first annular step surrounds the side wall to form a continuous closed ring shape, a positive electrode hole part is further formed in the steel shell, and a positive electrode end plate is riveted to the positive electrode hole part through an insulating sleeve piece; the steel shell, the positive electrode end plate and the rivet are isolated by the insulating sleeve piece, the positive electrode hole part is sealed, the positive electrode of the battery core body is connected to the head, located in the cavity of the steel shell, of the rivet, the battery core body is sealed in the cavity, and the negative electrode is electrically connected with the steel shell; the outer edge of the bottom face of the steel cover plate is attached to the top face of the first annular step, metal of the two attached faces is fused, sealed and combined, and the cover plate seals the shell opening. By adopting the technical scheme, the heat dissipation performance of the battery is improved, and the battery is easier to disassemble and recycle.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, in particular to a lithium ion battery and an electronic product. Background Art

[0002] As the application of smart wearable products becomes more and more extensive, people's demand for secondary rechargeable batteries is also increasing.

[0003] Soft-pack batteries sealed with aluminum-plastic film are widely used due to their mature manufacturing process. However, during the research process of the present invention, the inventors found that soft-pack lithium-ion batteries have the following defects:

[0004] The space at the folded edge in the width direction of the soft-pack battery and the tab sealing part cannot be effectively utilized, resulting in low volume energy density of the battery.

[0005] The heat dissipation is poor, especially with the development and promotion of fast charging technology, its heat dissipation effect cannot meet the increasingly high heat dissipation requirements.

[0006] The positive and negative electrodes of soft-pack lithium-ion batteries are both soft tabs heat-sealed between aluminum-plastic films. They are poorly replaceable and cannot meet the requirements of the new version of the Battery Regulation (EU) 2023 / 1542 that the battery must be removable and replaceable. Summary of the Invention

[0007] One of the purposes of the embodiments of the present utility model is to provide a lithium-ion battery and an electronic product. The adoption of this technical solution is conducive to improving the heat dissipation of the battery and making it easier to disassemble and recycle.

[0008] In a first aspect, this embodiment provides a lithium-ion battery comprising:

[0009] An integrated steel shell, comprising a shell opening, side walls surrounding the shell opening, and a shell bottom facing the shell opening.

[0010] A first annular step is provided on the inner wall of the side wall near the shell opening, and the first annular step surrounds the side wall in a continuous closed ring shape.

[0011] A positive hole is also provided on the steel shell, and the positive terminal plate is riveted to the positive hole through an insulating sleeve.

[0012] The insulating kit insulates the steel shell from the positive terminal plate and the rivet, seals the positive electrode hole, and the positive electrode of the battery cell is connected to the head of the rivet located in the cavity of the steel shell.

[0013] The battery core is sealed in the cavity, and the negative electrode is electrically connected to the steel shell;

[0014] The outer edge of the bottom surface of the steel cover plate is in contact with the top surface of the first annular step, and the metals of the two surfaces are melted and sealed, and the cover plate seals the shell opening.

[0015] Optionally, the insulation kit includes an inner insulation rubber part and an outer insulation film.

[0016] The inner insulating rubber part includes: an integral insulating collar and an insulating skirt, wherein the insulating skirt is formed along the outer edge of the bottom end of the insulating collar and extends radially outward to a predetermined width.

[0017] The insulating skirt is in close contact with the inner wall of the steel shell, the insulating collar is sleeved in the positive electrode hole, and the end thereof extends out of the steel shell;

[0018] The outer insulating film and the positive terminal plate are respectively provided with a through hole, and are jointly sleeved on the outside of the insulating sleeve extending outside the steel shell. The outer insulating film is closely attached to the outer wall of the side wall, and the positive terminal plate is closely attached to the top surface of the outer insulating film. The outer insulating film insulates and separates the positive terminal plate and the steel shell.

[0019] The core of the rivet passes through the insulating collar, one head is pressed against the bottom surface of the insulating skirt, and the other head is pressed against the top surface of the positive terminal plate. The insulating collar insulates the rivet from the steel shell.

[0020] The insulating sleeve and the insulating skirt are both in a compressed state, sealing the positive electrode hole.

[0021] Optionally, a second annular step lower than the top surface of the positive end plate is further provided on the top surface of the positive end plate, and the second annular step is in a continuous closed shape, surrounding the through hole of the positive end plate.

[0022] The outer edge of the head of the rivet is tightly against the top surface of the second annular step.

[0023] Optionally, the core of the rivet is solid.

[0024] Optionally, a liquid injection hole is further provided on one side wall of the steel shell, and a sealing sheet is provided on the liquid injection hole. The bottom surface of the sealing sheet is in contact with the outer surface of the side wall outside the liquid injection hole, and the metal of the adjacent surfaces is melted and sealed, and the sealing sheet seals the liquid injection hole.

[0025] Optionally, a negative terminal plate is welded to the outside of the steel shell.

[0026] Optionally, a negative electrode hole is further provided on the steel shell, the negative terminal plate is seal-welded to the negative electrode hole, and the negative electrode of the battery cell is welded to the end face of the negative terminal plate exposed in the negative electrode hole.

[0027] Optionally, an explosion-proof portion is further provided on the steel shell and / or the cover plate, and the wall thickness of the explosion-proof portion is thinner than the wall thickness of the steel shell and / or the cover plate.

[0028] Optionally, the height from the annular step to the shell opening is equal to the thickness of the cover plate, and the top surface of the cover plate is flush with the end surface of the shell opening of the steel shell.

[0029] In a second aspect, an electronic product provided by an embodiment of the present invention includes a power supply compartment,

[0030] The power supply compartment is provided with any of the above-mentioned lithium-ion batteries.

[0031] The positive electrode and the negative electrode of the lithium ion battery are electrically connected to the positive electrode and the negative electrode of the driving circuit of the electronic product respectively.

[0032] As can be seen from the above, the application of the technical solution of this embodiment is beneficial for increasing the capacity of lithium-ion batteries. Furthermore, the application of the steel shell assembly structure of this embodiment is beneficial for improving the heat dissipation of the battery, making it particularly suitable for rapid charging and high-current discharge. Furthermore, the lithium-ion battery of this solution is easier to disassemble and replace, facilitating the repair, disassembly, and recycling of lithium-ion batteries, making it more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute an improper limitation of the present invention.

[0034] Figure 1 A schematic diagram of the three-dimensional structure of a lithium-ion battery provided in Example 1 of the present utility model;

[0035] Figure 2 A schematic diagram of the three-dimensional structure of a lithium-ion battery provided in Example 1 of the present utility model from another perspective;

[0036] Figure 3 A schematic side view of the structure of a lithium-ion battery provided in Example 1 of the present utility model;

[0037] Figure 4 A schematic diagram of the three-dimensional structure of a steel shell of a lithium-ion battery provided in Example 1 of the present utility model;

[0038] Figure 5 for Figure 4 The schematic diagram of the exploded three-dimensional structure of the steel shell before riveting the positive end plate;

[0039] Figure 6 for Figure 5 The exploded side perspective structural diagram of the steel shell before the positive end plate is riveted;

[0040] Figure 7 A bottom view of the structure of a cover plate of a lithium-ion battery provided in the first embodiment of the present invention;

[0041] Figure 8 A schematic top view of the structure of a cover plate of a lithium-ion battery provided in Example 1 of the present utility model;

[0042] Figure 9 A schematic side perspective structural diagram of a cover plate of a lithium-ion battery provided in a first embodiment of the present invention.

[0043] 1: steel shell; 11: shell bottom; 12: side wall; 13: first annular step; 14: positive electrode hole;

[0044] 2: Cover plate; 3: Rivet; 31: First head; 32: Second head; 33: Core;

[0045] 4: positive terminal plate; 41: second annular step; 5: inner insulating rubber part; 51: insulating collar;

[0046] 52: Insulation skirt; 6: External insulation film; 7: Injection hole; 8: Sealing sheet;

[0047] 9: Negative terminal plate; 10: Explosion-proof part. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0049] Examples of embodiments of the present invention described in detail below are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0050] The embodiments described below with reference to the drawings attached to this specification are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be construed as limiting the present invention.

[0051] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0052] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example

[0053] See also Figure 1-9 .

[0054] This embodiment provides a steel-cased lithium-ion battery, which includes a steel casing 1, a cover plate 2, and a battery cell (not shown in the figure, for specific preparation, refer to the prior art). The steel casing 1 is made of a stainless steel plate, one end of the steel casing 1 is a casing opening, the closed end opposite the casing opening is a casing bottom 11, and the casing wall surrounding the casing bottom 11 and extending from the casing bottom 11 to the casing opening is a side wall 12.

[0055] An annular step of a certain width (referred to as a first annular step 13) is also formed on the inner wall of the sidewall 12. The first annular step 13 surrounds the sidewall 12 on all sides, forming a continuous, closed ring shape. It is parallel to the end surface of the sidewall 12 at the shell opening. The top surface of the first annular step 13 is lower than the shell opening, and the area of ​​the closed figure enclosed by the inner edge of the first annular step 13 is smaller than the area of ​​the closed figure enclosed by the inner edge of the shell opening. The steel shell 1 can be manufactured by, but is not limited to, a stamping process. A stamping part having the same shape as the shell bottom 11 of the steel shell 1 is stamped out of the steel plate to form a cavity. The stamped end of the cavity is formed by the stamping part, and the shell opening is further formed by further stamping using a stamping part with a larger area than the original stamping part. The sidewall 12 of the steel shell 1 near the shell opening is bent outward to form the first annular step 13 near the shell opening.

[0056] As an illustration of this embodiment, the top surface of the first annular step 13 has the same width at all locations. The height from the first annular step 13 to the end surface of the shell opening is equal to the thickness of the cover plate 2. The closed shape formed by the outer edge of the first annular step 13 is consistent with the outer shape of the cover plate 2. The first annular step 13 serves as a supporting platform for the cover plate 2. When the cover plate 2 is sealed to the top surface of the first annular step 13, the bottom surface of the cover plate 2, close to the outer edge, is face-to-face with the top surface of the first annular step 13. The end surface of the outer edge of the cover plate 2 is in contact with the inner wall of the side wall 12. The cover plate 2 is sunken and sealed inside the shell opening, and there is a seamless design between the cover plate 2 and the shell opening.

[0057] The cover plate 2 can be, but is not limited to, a sheet of steel plate. A vertical welding machine is used to weld along the edge of the top surface of the cover plate 2. The metal on the two surfaces of the cover plate 2 and the first annular step 13 that are in contact with each other melts and is fully sealed and bonded. The structure of welding the cover plate 2 with the first annular step 13 of this embodiment is conducive to accurately positioning the cover plate 2, avoiding displacement of the cover plate 2 and affecting the welding effect of the cover plate 2, ensuring the sealing between the cover plate 2 and the steel shell 1, and relative to the solution of welding the cover plate 2 to the end face of the side wall 12 of the shell opening, the design of this solution can design the width of the top surface of the first annular step 13 as the welding area of ​​the cover plate 2. The welding area of ​​the cover plate 2 is not limited to the thickness of the shell wall of the steel shell 1, which is conducive to the ultra-thin design of the steel shell 1 and the cover plate 2, so as to fully utilize the volume of the lithium-ion battery and improve the volume energy density.

[0058] As an illustration of this embodiment, the distance between the top surface of the first annular step 13 located on the inner wall of the side wall 12 and the shell opening is preferably equal to the thickness of the cover plate 2. This ensures that after the cover plate 2 is welded to the first annular step 13, the top surface of the cover plate 2 is flush with the end surface of the shell opening. This design ensures that the lithium-ion battery has a smooth and consistent appearance, which helps to fully utilize the space in the shell and increase the capacity of the lithium-ion battery.

[0059] The steel shell 1 is also provided with a hole, referred to as the positive electrode hole 14. In this first embodiment, the positive electrode hole 14 is designed in a side wall 12 of the steel shell 1 for illustration purposes. The positive electrode terminal plate 4 is hermetically riveted to the positive electrode hole 14 via an insulating sleeve and rivet 3. The positive electrode terminal plate 4 is located on the outer surface of the side wall 12, and the insulating sleeve insulates the steel shell 1 from the positive electrode terminal plate 4 (and the rivet 3). The first head 31 of the rivet 3, located outside the steel shell 1, presses against the positive electrode terminal plate 4 with a certain amount of pressure, while the second head 32, located inside the steel shell 1, presses against the insulating sleeve with a certain amount of pressure. Under the clamping action of the rivet 3, the insulating sleeve seals the positive electrode hole 14.

[0060] During the lithium-ion battery assembly process, a positive terminal plate 4 is pre-riveted onto the steel shell 1 as a preparatory material. During the battery cell assembly, the positive electrode of the battery cell is welded to the first head 31 of the rivet 3 located inside the steel shell 1, and the negative electrode of the battery cell is connected to any point on the inner wall of the steel shell 1. The positive terminal plate 4 connected to the rivet 3 serves as the positive electrode of the lithium-ion battery, and the steel shell 1 serves as the negative electrode of the lithium-ion battery.

[0061] This embodiment uses a laminated lithium-ion battery cell. The shape of each pole piece of the laminated battery cell is consistent with the shape of the shell bottom 11 of the steel shell 1. The thickness of the laminated battery cell is the same as or substantially the same as the height from the shell bottom 11 to the first annular step 13 of the steel shell 1. The space in the cavity of the steel shell 1 is fully utilized to improve the volume energy density of the lithium-ion battery.

[0062] Especially when applied to square batteries or heterogeneous steel shell batteries, compared with cylindrical wound battery cells, the laminated lithium-ion battery using the above solution can fully utilize the space inside the shell and improve the volume energy density of the battery.

[0063] As can be seen from the above, the application of the technical solution of this embodiment has the following beneficial effects:

[0064] On the one hand, it is beneficial to improve the volume energy density of lithium-ion batteries;

[0065] On the other hand, compared with the soft-pack lithium-ion battery, the steel shell 1 structure of this embodiment has better heat dissipation and is particularly suitable for fast charging and high-current discharge;

[0066] Moreover, compared with soft-pack lithium-ion batteries, the lithium-ion batteries of this solution are easy to disassemble, recycle, and replace, and their application is more in line with environmental protection requirements.

[0067] As an illustration of this embodiment, the insulation kit of this embodiment includes an inner insulation rubber part 5 and an outer insulation film 6.

[0068] The inner insulating rubber part 5 includes an insulating collar 51 and an insulating skirt 52 , and the insulating collar 51 and the insulating skirt 52 are integrally formed by injection molding.

[0069] The height of the insulating collar 51 is greater than the wall thickness of the steel shell 1. When the insulating collar 51 is inserted into the positive electrode hole 14, the end of the insulating collar 51 protrudes a certain height outside the steel shell 1. The inner diameter of the insulating collar 51 is equal to or slightly smaller than the outer diameter of the core 33 of the rivet 3, so that when the core 33 of the rivet 3 passes through the insulating collar 51, the insulating collar 51 is tightly fitted around the outside of the rivet 3. The outer diameter of the insulating collar 51 is equal to or slightly smaller than the diameter of the positive electrode hole 14 in the steel shell 1, so that the insulating collar 51, with the core 33 of the rivet 3 inserted, is tightly fitted within the positive electrode hole 14, sealing the positive electrode hole 14.

[0070] The insulating skirt 52 is located at the bottom end of the insulating collar 51. The insulating skirt 52 is an insulating sheet extending radially outward from the outer edge of the insulating collar 51 to a certain width. The insulating skirt 52 is a sheet-shaped insulating skirt 52 surrounding the insulating collar 51. The outer diameter of the insulating skirt 52 is equal to or greater than the width of the second head 32 of the rivet 3 located within the steel shell 1.

[0071] The thickness of the insulation layers of the insulating collar 51 and the insulating skirt 52 may be the same or different.

[0072] The outer insulating film 6 is in sheet form and has a through hole. The diameter of the through hole is equal to or slightly larger than the outer diameter of the insulating collar 51. The insulating collar 51 extending outside the steel shell 1 passes through the through hole of the outer insulating film 6.

[0073] When assembling the positive terminal plate 4, the inner insulating rubber member 5 is inserted into the steel shell 1 through the shell opening. The insulating collar 51 passes through the positive electrode hole 14 from the steel shell 1 and fits within the positive electrode hole 14. The insulating skirt 52 at the bottom end of the inner insulating rubber member 5 is in close contact with the inner wall of the side wall 12 surrounding the outer periphery of the positive electrode hole 14. The end of the insulating collar 51 extends a certain height out of the steel shell 1, slightly exceeding the outer surface of the side wall 12 of the steel shell 1. The outer insulating rubber sheet 6 is in close contact with the outer surface of the side wall 12. The through-holes of the outer insulating rubber sheet 6 and the positive terminal plate 4 are both aligned with the positive electrode hole 14 of the steel shell 1. The positive terminal plate 4 is in close contact with the top surface of the outer insulating rubber sheet 6. The outer insulating rubber sheet 6 and the positive terminal plate 4 are tightly fitted around the insulating collar 51 extending outside the side wall 12 of the steel shell 1. The outer insulating rubber sheet 6 is in close contact with the side wall 12 of the steel shell 1, interposed between the steel shell 1 and the positive terminal plate 4.

[0074] The core 33 of the rivet 3 penetrates the insulating collar 51 of the inner insulating rubber component 5. One head of the rivet 3 is located inside the steel shell 1 and presses against the bottom surface of the insulating skirt 52 of the inner insulating rubber component 5 with a certain amount of pressure. The insulating skirt 52 is insulated and spaced between the second head 32 of the rivet 3 and the side wall 12 of the steel shell 1. The first head 31 of the rivet 3 is located outside the steel shell 1 and presses against the positive terminal plate 4 with a certain amount of pressure. Under the penetration and clamping action of the rivet 3, the insulating skirt 52 and the outer insulating rubber component 6 tightly seal the positive electrode hole 14.

[0075] The positive terminal plate 4 is riveted and fastened to the outside of the steel shell 1 , and the rivet 3 is fastened to the positive terminal plate 4 , and together they serve as the positive terminal of the lithium-ion battery in the steel shell 1 for external connection.

[0076] The head of the rivet 3 located in the cavity of the steel shell 1 serves as a fixed connection end of the positive electrode of the battery cell. The positive electrode of the battery cell is fixed to the head of the rivet 3 by laser welding.

[0077] As an illustration of this embodiment, in a natural state, the size of the external insulating film 6 can be the same as the size of the positive terminal plate 4. Under the penetration and clamping action of the rivet 3, the external insulating film 6 is deformed and slightly wider than the positive terminal plate 4 and exceeds the outer edge of the positive terminal plate 4, ensuring the insulation isolation between the positive terminal plate 4 and the steel shell 1; an external insulating film 6 that is slightly wider than the positive terminal plate 4 in a natural state can also be selected.

[0078] As an illustration of this embodiment, a circle of annular steps lower than the top surface of the positive terminal plate 4 can be further provided on the top surface of the positive terminal plate 4 close to the through hole, which is recorded as the second annular step 41, so that the outer edge of the head of the rivet 3 is tightly against the top surface of the second annular step 41, thereby achieving the fastening and riveting of the positive terminal plate 4. This design is conducive to improving the riveting positioning of the head of the rivet 3 and improving the assembly consistency of the lithium-ion battery.

[0079] As an illustration of this embodiment, the head of the rivet 3 can be made flush with the top surface of the positive terminal plate 4 , or the first head 31 of the rivet 3 can be made slightly higher than the top surface of the positive terminal plate 4 .

[0080] This embodiment uses a rivet 3 with a solid core 33 to reduce the impedance of the positive electrode of the lithium-ion battery. The solid core 33 is also beneficial for enhancing the riveting strength.

[0081] As an illustration of this embodiment, a liquid injection hole 7 may be further provided on the steel shell 1, preferably but not limited to being provided on the side wall 12. During assembly of the battery cell, electrolyte injection is performed after the positive and negative electrodes of the battery cell and the steel shell 1 are welded, and after the cover plate 2 is welded. This can prevent the electrolyte from contaminating the welding surface and affecting the welding effect, resulting in a cold weld.

[0082] In addition, compared with the solution in which the injection hole 7 is provided on the cover plate 2 or the shell bottom 11, the injection hole 7 is provided on the side wall 12, and the electrolyte penetrates from the side of the laminated battery cell, which is more conducive to improving the penetration efficiency of the electrolyte, improving the injection effect and improving work efficiency.

[0083] After the liquid is injected, a metal sheet with an area larger than the liquid injection hole 7 is covered on the liquid injection hole 7 as a sealing sheet 8. The top surface of the sealing sheet 8 is laser welded at a predetermined distance around the outer periphery of the liquid injection hole 7 to form a welding track surrounding the outside of the liquid injection hole 7. In the welding track area, the metal of the contact surface between the sealing sheet 8 and the side wall 12 is melted and sealed to seal the liquid injection hole 7.

[0084] As an illustration of this embodiment, the liquid injection hole 7 and the positive terminal plate 4 can be provided on the same side wall 12 of the steel shell 1 .

[0085] As an illustration of this embodiment, a negative terminal plate 9 may be further provided on the side wall 12 of the steel shell 1 and welded to the side wall 12 of the steel shell 1 to facilitate connection of an external power source.

[0086] As an illustration of this embodiment, a through hole can be further provided on the side wall 12 of the steel shell 1, which is recorded as the negative electrode hole portion. The negative terminal plate 9, which has an area larger than the negative electrode hole portion, covers the negative electrode hole portion. Laser welding is performed from the top surface of the negative terminal plate 9 to melt and seal the adjacent metals of the negative terminal plate 9 and the side wall 12. The negative terminal plate 9 seals the negative electrode through hole. The bottom end of the negative terminal plate 9 is exposed to the interior of the steel shell 1 through the negative electrode hole portion. The negative electrode of the battery cell is welded to the bottom end of the negative terminal plate 9 to achieve fixed-point welding of the negative electrode.

[0087] As an illustration of this embodiment, the explosion-proof portion 10 can be provided at any location on the wall of the steel shell 1 (or cover plate 2), with the wall thickness at the location of the explosion-proof portion 10 being thinner than the wall thickness at other locations of the steel shell 1 (or cover plate 2). For example, but not limited to, the explosion-proof portion 10 can be provided at the bottom 11 of the steel shell 1, or on the cover plate 2 opposite the bottom 11.

[0088] The thinned position of the explosion-proof portion 10 can be located on the outer surface of the battery for easy identification by the user; it can also be located on the inner surface of the battery.

[0089] The lithium-ion battery of this embodiment can be used in electronic products. The lithium-ion battery is installed in the power supply compartment of the electronic product, and the positive and negative electrodes of the lithium-ion battery are electrically connected to the positive and negative electrodes of the driving circuit of the electronic product respectively. The battery is used as the power supply for the driving circuit to drive the circuit of the electronic product.

[0090] As an illustration of this embodiment, the shapes of the positive terminal plate 4 and the negative terminal plate 9 can be designed to be different, but not limited to, to improve the identification of the positive and negative poles and avoid reverse connection.

[0091] As an illustration of this embodiment, it is possible but not limited to setting a power contact opposite to the positive terminal plate 4 and the negative terminal plate 9 of the steel shell 1 battery in the power compartment, and setting a spring at the rear end of the power terminal. Through the elastic force, the power contact with the drive circuit is respectively pressed against the positive terminal plate 4 and the negative terminal plate 9 of the steel shell 1 battery with a certain pressure, so that the connection of the power supply is simple and convenient.

[0092] As an illustration of this embodiment, the outer shell composed of a steel shell 1 and a cover plate 2 of this embodiment can be flexibly designed according to the shape of the power supply compartment of the electronic product. For example, when the power supply compartment has a pentagonal structure, the outer shell can be designed as a cylindrical structure with a closed figure having a pentagonal cross-section. Similarly, when the power supply compartment has other special-shaped structures, the outer shell of the battery is designed to be a matching special shape, which is conducive to making full use of the space of the power supply compartment and improving the volume energy density of the lithium-ion battery.

[0093] The above-described embodiments do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the above-described embodiments shall be included in the scope of protection of this technical solution.

Claims

1. A lithium ion battery, characterized in that: include, An integrated steel shell comprises a shell opening, a side wall surrounding the shell opening, and a shell bottom facing the shell opening. A first annular step is provided on the inner wall of the side wall near the shell opening, and the first annular step surrounds the side wall in a continuous closed ring shape. The steel shell is also provided with a positive hole, and the positive terminal plate is riveted to the positive hole through an insulating sleeve. The insulating kit insulates the steel shell from the positive terminal plate and the rivet, seals the positive electrode hole, and the positive electrode of the battery cell is connected to the head of the rivet located in the cavity of the steel shell. The battery core is sealed in the cavity, and the negative electrode is electrically connected to the steel shell; The outer edge of the bottom surface of the steel cover plate is in contact with the top surface of the first annular step, and the metals of the two surfaces are melted and sealed, and the cover plate seals the shell opening.

2. The lithium-ion battery according to claim 1, characterized in that: The insulation kit includes an inner insulation rubber part and an outer insulation film. The inner insulating rubber part comprises: an integral insulating sleeve ring and an insulating skirt, wherein the insulating skirt is formed along the outer edge of the bottom end of the insulating sleeve ring and radially extends outward to a predetermined width. The insulating skirt is in close contact with the inner wall of the steel shell, the insulating sleeve is sleeved in the positive electrode hole, and the end thereof extends out of the steel shell; The outer insulating film and the positive terminal plate are respectively provided with a through hole, and are collectively sleeved on the outside of the insulating sleeve ring extending outside the steel shell. The outer insulating film is closely attached to the outer wall of the side wall, and the positive terminal plate is closely attached to the top surface of the outer insulating film. The outer insulating film insulates and separates the positive terminal plate from the steel shell. The core of the rivet passes through the insulating sleeve, one head is pressed against the bottom surface of the insulating skirt, and the other head is pressed against the top surface of the positive terminal plate. The inner insulating rubber part insulates the rivet and the steel shell. The insulating sleeve ring and the insulating skirt are both in a compressed state, sealing the positive electrode hole.

3. The lithium-ion battery according to claim 2, characterized in that: A second annular step lower than the top surface of the positive end plate is also provided on the top surface of the positive end plate, and the second annular step is in a continuous closed shape, surrounding the through hole of the positive end plate. The outer edge of the head of the rivet is tightly against the top surface of the second annular step.

4. The lithium-ion battery according to claim 2, characterized in that: The core of the rivet is solid.

5. The lithium-ion battery according to claim 1, characterized in that: A liquid injection hole is also provided on one side wall of the steel shell, and a sealing sheet is provided on the liquid injection hole. The bottom surface of the sealing sheet is in contact with the outer surface of the side wall outside the liquid injection hole, and the metal of the contacting surfaces is molten and sealed, and the sealing sheet seals the liquid injection hole.

6. The lithium-ion battery according to claim 1, characterized in that: A negative terminal plate is also welded on the outer side of the steel shell.

7. The lithium-ion battery according to claim 6, characterized in that: A negative electrode hole is also provided on the steel shell, the negative terminal plate is sealed and welded on the negative electrode hole, and the negative electrode of the battery cell is welded to the end surface of the negative terminal plate exposed from the negative electrode hole.

8. The lithium-ion battery according to claim 1, characterized in that: An explosion-proof portion is also provided on the steel shell and / or the cover plate, and the wall thickness of the explosion-proof portion at the location thereof is thinner than the wall thickness of the steel shell and / or the cover plate.

9. The lithium-ion battery according to claim 1, characterized in that: The height from the annular step to the shell opening is equal to the thickness of the cover plate, and the top surface of the cover plate is flush with the end surface of the shell opening of the steel shell.

10. An electronic product, characterized in that: Including power supply compartment, A lithium-ion battery according to any one of claims 1 to 9 is arranged in the power supply compartment. The positive electrode and the negative electrode of the lithium ion battery are electrically connected to the positive electrode and the negative electrode of the driving circuit of the electronic product respectively.

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