Button-type battery cell

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a button type battery cell. The buckle type battery cell comprises a shell assembly, a positive terminal, a negative terminal and a roll core, the shell assembly comprises a shell with two open ends, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are both provided with open holes, and the upper cover plate and the lower cover plate are arranged at the two opposite ends of the shell respectively; the positive terminal is arranged on the side, facing the lower cover plate, of the upper cover plate, the negative terminal is arranged on the side, facing the upper cover plate, of the lower cover plate, the positive terminal and the negative terminal extend and penetrate through the open holes respectively, the positive terminal and the upper cover plate are arranged in an insulated mode, and the negative terminal and the lower cover plate are arranged in an insulated mode; and the roll core is arranged in the shell, is connected with the positive terminal through the positive tab and is connected with the negative terminal through the negative tab. The problem of easy external short circuit between the positive electrode and the negative electrode in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a button-type battery core. Background Art

[0002] Button cell is a common type of rechargeable battery, also known as lithium-ion battery. It consists of a shell (usually steel shell) enclosing the positive and negative electrodes and electrolyte of the battery. The design of button cell makes it suitable for many applications, such as portable electronic devices, power tools, electric vehicles, etc. They have high energy density, long life and low self-discharge rate, so they are widely used in many applications.

[0003] Most of the button-type batteries currently on the market use the entire steel shell surface as the negative electrode, and the positive and negative electrodes are isolated by only a layer of insulating rubber layer. Because the gap between the insulating rubber layer is small and thin, there is a common problem of external short circuit between the positive and negative electrodes. Utility Model Content

[0004] The technical problem to be solved by the embodiment of the utility model is to provide a button-type battery cell to solve the problem of easy external short circuit between the positive electrode and the negative electrode in the prior art.

[0005] The utility model discloses a button-type battery cell, comprising: a shell component, a positive terminal, a negative terminal and a winding core, the shell component comprising a shell with openings at both ends, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are both provided with openings, and the upper cover plate and the lower cover plate are respectively arranged at opposite ends of the shell; the positive terminal is arranged on a side of the upper cover plate facing the lower cover plate, the negative terminal is arranged on a side of the lower cover plate facing the upper cover plate, and the positive terminal and the negative terminal respectively extend and pass through the opening, the positive terminal is insulated from the upper cover plate, and the negative terminal is insulated from the lower cover plate; the winding core is arranged in the shell, and the winding core is connected to the positive terminal through a positive ear, and is connected to the negative terminal through a negative ear.

[0006] Optionally, a first insulating layer is provided between the upper cover plate and the positive terminal, and a second insulating layer is provided between the lower cover plate and the negative terminal.

[0007] Optionally, the outer shell is respectively connected to the upper cover plate and the lower cover plate by welding.

[0008] Optionally, the positive terminal and the negative terminal are both made of steel.

[0009] Optionally, the positive terminal is made of aluminum, and the negative terminal is made of steel.

[0010] Optionally, the positive terminal is connected to the upper cover plate by thermally compounding a PP glue layer, and / or the negative terminal is connected to the lower cover plate by thermally compounding a PP glue layer.

[0011] Optionally, the negative terminal is connected to the lower cover plate by riveting, and / or the positive terminal is connected to the upper cover plate by riveting.

[0012] Optionally, the positive electrode tab is connected to the upper cover plate by laser welding, resistance welding or ultrasonic welding, and the negative electrode tab is connected to the lower cover plate by laser welding, resistance welding or ultrasonic welding.

[0013] Optionally, the second insulating layer passes through the opening of the lower cover plate and extends to a side of the lower cover plate facing away from the upper cover plate, and / or the first insulating layer passes through the opening of the upper cover plate and extends to a side of the upper cover plate facing away from the lower cover plate.

[0014] Optionally, the housing assembly is a cylindrical structure or a rectangular structure.

[0015] Compared with the prior art, the beneficial effect of the button-type battery provided by the embodiment of the utility model is that the shell assembly is composed of an outer shell, an upper cover plate and a lower cover plate. This design provides a stable shell assembly to protect the winding core contained inside from the influence of the external environment. The openings of the upper cover plate and the lower cover plate allow the positive terminal and the negative terminal to pass through and connect to the outside world, so that the positive terminal passing through the opening of the upper cover plate and the negative terminal passing through the opening of the lower cover plate serve as the positive and negative polarity areas of the button-type battery cell, effectively reducing the polarity area of ​​the negative electrode and improving the problem that the button-type battery cell is prone to external short circuit. The winding core is connected to the positive terminal through the positive ear and to the negative terminal through the negative ear, providing a current transmission path. The design of the positive terminal extending and passing through the opening of the upper cover plate and the negative terminal extending and passing through the opening of the lower cover plate ensures a reliable connection between the button-type battery cell and the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 It is a schematic diagram of a button-type battery provided by an embodiment of the utility model;

[0018] Figure 2 It is a connection diagram of an upper cover plate and a lower cover plate provided in another embodiment of the utility model.

[0019] The reference numerals in the figures are:

[0020] 1000, button-type battery cell; 100, shell assembly; 101, shell; 102, upper cover; 1021, opening; 103, lower cover; 201, positive terminal; 202, negative terminal; 300, winding core; 301, positive ear; 302, negative ear; 401, first insulating layer; 402, second insulating layer. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0022] The present utility model embodiment provides a button type battery cell 1000, such as Figure 1 As shown, the button-type battery cell 1000 includes: a shell assembly 100, a positive terminal 201, a negative terminal 202 and a winding core 300, the shell assembly 100 includes a shell 101 with openings at both ends, an upper cover plate 102 and a lower cover plate 103, the upper cover plate 102 and the lower cover plate 103 are both provided with openings 1021, and the upper cover plate 102 and the lower cover plate 103 are respectively arranged at opposite ends of the shell 101; the positive terminal 201 is arranged on the side of the upper cover plate 102 facing the lower cover plate 103 The negative terminal 202 is arranged on the side of the lower cover 103 facing the upper cover 102, and the positive terminal 201 and the negative terminal 202 extend and pass through the opening 1021 respectively, the positive terminal 201 and the upper cover 102 are insulated, and the negative terminal 202 and the lower cover 103 are insulated; the winding core 300 is arranged in the outer shell 101, and the winding core 300 is connected to the positive terminal 201 through the positive ear 301, and is connected to the negative terminal 202 through the negative ear 302.

[0023] The shell assembly 100 is composed of an outer shell 101, an upper cover plate 102 and a lower cover plate 103. This design provides a stable shell assembly 100, which protects the core 300 contained inside from the influence of the external environment. The openings 1021 of the upper cover plate 102 and the lower cover plate 103 allow the positive terminal 201 and the negative terminal 202 to pass through and connect to the outside world, so that the positive terminal 201 passing through the opening 1021 of the upper cover plate 102 and the negative terminal 202 passing through the opening 1021 of the lower cover plate 103 serve as the positive and negative polarity areas of the button-type battery cell 1000, effectively reducing the polarity area of ​​the negative pole and improving the problem that the button-type battery cell 1000 is prone to external short circuit. The core 300 is connected to the positive terminal 201 through the positive ear 301 and is connected to the negative terminal 202 through the negative ear 302, providing a current transmission path. The design that the positive terminal 201 extends through the opening 1021 of the upper cover plate 102 and the negative terminal 202 extends through the opening 1021 of the lower cover plate 103 ensures reliable connection between the button-type battery 1000 and the outside world.

[0024] Specifically, the winding core 300 is located inside the housing 101, connected to the positive terminal 201 through the positive pole ear 301, and connected to the negative terminal 202 through the negative pole ear 302, thereby ensuring the flow of current and enabling the button-type battery cell 1000 to work normally.

[0025] Referring to the figure, a first insulating layer 401 is provided between the upper cover plate 102 and the positive terminal 201 , and a second insulating layer 402 is provided between the lower cover plate 103 and the negative terminal 202 .

[0026] The first insulating layer 401 is arranged between the upper cover plate 102 and the positive terminal 201, and the second insulating layer 402 is arranged between the lower cover plate 103 and the negative terminal 202, so as to isolate the positive terminal 201 from the upper cover plate 102, and the negative terminal 202 from the lower cover plate 103, and prevent short circuit and current leakage. Through the above arrangement, the positive terminal 201 and the negative terminal 202 can be effectively isolated from other components to prevent short circuit and current leakage. This helps to improve the safety and reliability of the button cell 1000.

[0027] Specifically, the first insulating layer 401 and the second insulating layer 402 can also provide a certain mechanical protection effect. It can serve as an additional protective layer to protect the positive terminal 201, the negative terminal 202 and other components from external physical damage, such as vibration, collision and pressure. This helps to extend the service life of the button cell 1000 and improve its durability.

[0028] In an optional embodiment of the present invention, the housing 101 is respectively connected to the upper cover plate 102 and the lower cover plate 103 by welding.

[0029] The welded connection between the housing 101 and the upper cover plate 102 and the lower cover plate 103 provides structural stability for the button cell 1000. This connection method can ensure a tight fit between the housing 101 and other components, reducing the possibility of loosening or displacement. The stable structure helps protect the internal components and improves the durability and reliability of the button cell 1000.

[0030] On the other hand, the welding connection between the housing 101 and the upper cover plate 102 and the lower cover plate 103 can provide a certain sealing and protection function. The welding connection can reduce the impact of the external environment on the inside of the button cell 1000, such as moisture, dust and chemicals. This helps to protect the internal components from damage and improve the reliability and safety of the button cell 1000.

[0031] In this embodiment, the upper cover plate 102 and the lower cover plate 103 are respectively connected to the housing 101 by laser welding, which is a high-precision welding technology that uses a laser beam for welding. Laser welding focuses a high-energy-density laser beam on the welding area, causing it to heat and melt rapidly, thereby achieving the connection between the upper cover plate 102 and the lower cover plate 103 and the housing 101. Laser welding has the advantages of high energy density, non-contact, small heat-affected zone, high precision, and strong controllability.

[0032] In an optional embodiment of the present invention, the positive terminal 201 and the negative terminal 202 are both made of steel.

[0033] Using steel material as the material of the positive terminal 201 and the negative terminal 202 can provide good electrical connection performance. Steel has low resistance and good conductivity, so it can ensure reliable and stable electrical connection between the winding core 300 and the positive terminal 201, and between the winding core 300 and the negative terminal 202.

[0034] Specifically, steel has high strength and rigidity, and can provide good structural stability. This is very important for button cells 1000, because they need to withstand vibration, impact, and other external forces. Using steel positive and negative terminals 202 can increase the structural strength of button cells 1000, and improve their durability and reliability.

[0035] Specifically, steel materials generally have good corrosion resistance. There may be some corrosive substances or electrolytes inside the button-type battery 1000, which may corrode the material. The positive terminal 201 and the negative terminal 202 made of corrosion-resistant steel materials can improve the corrosion resistance of the button-type battery 1000 and extend its service life.

[0036] Furthermore, in an optional embodiment of the present invention, the positive terminal 201 is made of aluminum material, and the negative terminal 202 is made of steel material.

[0037] The positive terminal 201 is made of aluminum material, which can provide higher electrical conductivity and electrochemical activity, and is helpful for the charging and discharging process of the button cell 1000. The aluminum material also has a lower tendency to self-corrosion, which can reduce the side reactions inside the housing assembly 100 and improve the efficiency and stability of the button cell 1000.

[0038] Specifically, the aluminum material has a high thermal conductivity, and can effectively conduct the heat generated inside the button-type battery cell 1000, thereby improving the heat dissipation performance of the button-type battery cell 1000. In addition, the aluminum material also has the advantages of being lightweight and corrosion-resistant.

[0039] In an optional embodiment of the present invention, the positive terminal 201 is connected to the upper cover plate 102 by thermally compounding the PP glue layer, and / or the negative terminal 202 is connected to the lower cover plate 103 by thermally compounding the PP glue layer.

[0040] Through the thermal compounding of the PP glue layer, it can be ensured that the positive terminal 201 and the upper cover plate 102, and / or the negative terminal 202 and the lower cover plate 103 are tightly fixed together, reducing the risk of loosening or falling off. A stable connection helps to improve the structural stability and overall mechanical strength of the button-type battery 1000. In practical applications, the positive terminal 201 can be connected to the upper cover plate 102 by thermal compounding of the PP glue layer, and the negative terminal 202 is also connected to the lower cover plate 103 by thermal compounding of the PP glue layer, or only the positive terminal 201 is connected to the upper cover plate 102 by thermal compounding of the PP glue layer, and the negative terminal 202 is connected to the lower cover plate 103 by other means, or only the negative terminal 202 is connected to the lower cover plate 103 by thermal compounding of the PP glue layer, and the positive terminal 201 is connected to the upper cover plate 102 by other means.

[0041] It should be noted that PP adhesive layer refers to polypropylene adhesive layer, which is a film or coating made of polypropylene material. Polypropylene is a thermoplastic polymer with good chemical stability, mechanical properties and thermal properties. PP adhesive layer also has the advantages of good bonding performance, high temperature resistance and light weight.

[0042] Specifically, the PP adhesive layer has good insulation properties and can effectively isolate the electrical signals between the positive terminal 201 and the upper cover 102, and between the negative terminal 202 and the lower cover 103. This helps prevent short circuits or other electrical problems in the button cell 1000 during operation, thereby improving the safety and stability of the button cell 1000.

[0043] It should be noted that thermal bonding is a technology that firmly connects two or more materials through a thermal process. It is achieved by heating the materials to melt or soften their surfaces, and then pressing them together to form a strong connection during the cooling process.

[0044] Further, in an optional embodiment of the present invention, the negative terminal 202 is connected to the lower cover plate 103 by riveting, and / or the positive terminal 201 is connected to the upper cover plate 102 by riveting.

[0045] In actual applications, the negative terminal 202 is connected to the lower cover 103 by riveting, and the positive terminal 201 can also be connected to the upper cover 102 by riveting, or only the negative terminal 202 is connected to the upper and lower cover 103 by riveting, while the positive terminal 201 is connected to the upper cover 102 by other means, or only the positive terminal 201 is connected to the upper cover 102 by riveting, while the negative terminal 202 is connected to the lower cover 103 by other means.

[0046] In this embodiment, by riveting the negative terminal 202 and the lower cover 103 together, it can be ensured that the connection is firm and not easy to loosen or fall off. The negative terminal 202 and the lower cover 103 are riveted together, so that the negative terminal 202 and the lower cover 103 form a structurally stable connection, which effectively improves the stability and vibration resistance of the button-type battery 1000.

[0047] Specifically, riveting is a relatively simple assembly method. Compared with other complex connection methods, riveting connection is easier to implement, can simplify the manufacturing process and improve production efficiency.

[0048] Further, referring to the figure, the second insulating layer 402 passes through the opening 1021 of the lower cover plate 103 and extends to a side of the lower cover plate 103 away from the upper cover plate 102, and / or the first insulating layer 401 passes through the opening 1021 of the upper cover plate 102 and extends to a side of the upper cover plate 102 away from the lower cover plate 103.

[0049] When the lower cover plate 103 is connected to the negative terminal 202 by riveting, and the positive terminal 201 is connected to the upper cover plate 102 by other means, the first insulating layer 401 is pasted between the positive terminal and the upper cover plate 102, and extends into the opening 1021 of the upper cover plate 102, providing good insulation performance between the positive terminal and the upper cover plate 102, and the second insulating layer 402 is arranged between the negative terminal 202 and the lower cover plate 103, and also extends through the opening 1021 of the lower cover plate 103 toward the side of the lower cover plate 103 away from the upper cover plate 102, providing more effective insulation performance between the negative terminal 202 and the lower cover plate 103. The first insulating layer 401 and the second insulating layer 402 can effectively isolate the current between the positive terminal 201 and the negative terminal 202 and the housing assembly 100, and prevent the button-type battery 1000 from having problems such as short circuit or leakage.

[0050] In an optional embodiment of the present invention, the positive electrode tab 301 is connected to the upper cover plate 102 by laser welding, resistance welding or ultrasonic welding, and the negative electrode tab 302 is connected to the lower cover plate 103 by laser welding, resistance welding or ultrasonic welding.

[0051] Laser welding, resistance welding and ultrasonic welding can all provide strong connections. These welding methods can form reliable welding connections between the positive electrode ear 301 and the upper cover plate 102, and between the negative electrode ear 302 and the lower cover plate 103, ensuring a firm connection that is not easy to loosen or fall off, and helping to improve the stability and vibration resistance of the overall assembly.

[0052] Specifically, laser welding, resistance welding and ultrasonic welding can all achieve good electrical connection. These welding methods can ensure good current conduction between the positive electrode ear 301 and the upper cover plate 102, and between the negative electrode ear 302 and the lower cover plate 103, reduce resistance, and improve the electrical performance of the button cell 1000.

[0053] Laser welding, resistance welding and ultrasonic welding can all provide better high temperature performance and corrosion resistance, making the connection between the positive electrode tab 301 and the positive electrode terminal 201, and between the negative electrode tab 302 and the negative electrode terminal 202 more stable, thereby extending the life of the connection.

[0054] In an optional embodiment of the present invention, the housing assembly 100 is a cylindrical structure or a rectangular structure.

[0055] The cylindrical housing assembly 100 can provide better structural stability. The cylindrical structure has the characteristics of uniformly distributed stress and can withstand greater external pressure and extrusion force, thereby protecting the internal winding core 300 and other components from damage.

[0056] Specifically, the cylindrical housing assembly 100 can effectively utilize space. Compared with housings of other shapes, the cylindrical structure can maximize the utilization of the internal space of the button-type battery cell 1000.

[0057] When the shell assembly 100 is rectangular, the shell assembly 100 has a larger surface area. Under the same volume, the rectangular cross-section can provide a larger surface area, which is beneficial to the contact between the winding core 300 and the electrolyte, and improves the energy storage capacity of the button cell 1000. The rectangular cross-section can more effectively utilize the space of the button cell 1000, which is particularly suitable for certain devices or applications of specific shapes. The button cell 1000 with a rectangular cross-section can be more easily stacked in parallel and / or assembled in series to form a battery pack with a larger capacity or higher voltage.

[0058] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A button-type battery cell, characterized in that: include: A shell assembly, the shell assembly comprising a shell with openings at both ends, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are both provided with openings, and the upper cover plate and the lower cover plate are respectively arranged at opposite ends of the shell; A positive terminal and a negative terminal, wherein the positive terminal is disposed on a side of the upper cover plate facing the lower cover plate, and the negative terminal is disposed on a side of the lower cover plate facing the upper cover plate, and the positive terminal and the negative terminal extend and pass through the opening respectively, the positive terminal is insulated from the upper cover plate, and the negative terminal is insulated from the lower cover plate; The winding core is arranged in the shell, and the winding core is connected to the positive terminal through a positive electrode ear and connected to the negative terminal through a negative electrode ear.

2. The button-type battery cell according to claim 1, characterized in that: A first insulating layer is provided between the upper cover plate and the positive terminal, and a second insulating layer is provided between the lower cover plate and the negative terminal.

3. The button-type battery cell according to claim 1, characterized in that: The shell is respectively connected to the upper cover plate and the lower cover plate by welding.

4. The button-type battery cell according to claim 1, characterized in that: The positive terminal and the negative terminal are both made of steel.

5. The button-type battery cell according to claim 4, characterized in that: The positive terminal is made of aluminum material, and the negative terminal is made of steel material.

6. The button-type battery cell according to any one of claims 1 to 5, characterized in that: The positive terminal is connected to the upper cover plate by thermal bonding of a PP glue layer, and / or the negative terminal is connected to the lower cover plate by thermal bonding of a PP glue layer.

7. The button-type battery cell according to any one of claims 1 to 5, characterized in that: The negative terminal is connected to the lower cover plate by riveting, and / or the positive terminal is connected to the upper cover plate by riveting.

8. The button-type battery cell according to any one of claims 1 to 5, characterized in that: The positive electrode ear is connected to the upper cover plate by laser welding, resistance welding or ultrasonic welding, and the negative electrode ear is connected to the lower cover plate by laser welding, resistance welding or ultrasonic welding.

9. The button-type battery cell according to claim 2, characterized in that: The second insulating layer passes through the opening of the lower cover plate and extends to a side of the lower cover plate away from the upper cover plate, and / or the first insulating layer passes through the opening of the upper cover plate and extends to a side of the upper cover plate away from the lower cover plate.

10. The button-type battery cell according to any one of claims 1 to 5, characterized in that: The housing assembly is a cylindrical structure or a rectangular structure.

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