Lithium battery with temperature control protection function

Abstract

The utility model relates to a lithium battery with a temperature control protection function, which comprises a core body, a shell and a cover plate, the shell is connected with a cathode of the core body and wraps the periphery of the core body, the cover plate is connected with an anode of the core body, the cover plate comprises an upper cover plate and a PTC (Positive Temperature Coefficient) component, and the PTC component is positioned below the upper cover plate. According to the lithium battery with the temperature control protection function provided by the utility model, the short-circuit protection function is realized through the PTC component on the cover plate, and the PTC component and the cover plate are compounded together, so that the short-circuit protection function is added to the battery under the condition that the appearance size of the battery is not influenced; the device has the characteristics of high efficiency, convenience, high reliability, ultra-thin and ultra-micro structure, standardized production and the like, and is extremely high in practicability.

Description

Technical Field

[0001] The utility model relates to the field of energy, and in particular to a lithium battery with a temperature control protection function. Background Art

[0002] Many digital products do not have circuit breakers and cannot protect the battery well. If the product circuit fails, it can easily cause an external short circuit in the battery. Once the battery is short-circuited, it can easily cause a fire or explosion, causing casualties and property losses.

[0003] Currently in the industry, batteries are protected by external protection circuits, or external PTC, FUSE, TCO and other protection devices. The battery itself does not have a protection function. However, many safety certification standards and national standards often put forward safety requirements after the battery protection circuit fails.

[0004] For example, the UL2054 safety standard (lithium battery) of the United States UL safety certification standard, item 11. Mandatory overcharge test:

[0005] 11.1 The sample batteries used for testing are charged at a constant current of 10*C5. Each battery or cell is attached with a thermal coupling assembly and then charged until the battery or cell explodes, leaks, or the temperature of the shell surface returns to the ambient temperature or reaches a stable state.

[0006] 11.2 During the test, the overcurrent and thermal protection devices that respond must be safety certified. Unapproved protection devices should be short-circuited.

[0007] 11.3 The sample should not catch fire or explode.

[0008] The existing technology requires purchasing expensive safety certification protection devices to pass the test. Due to size, structure or cost reasons, this method has been unable to meet the design requirements of battery manufacturers. As a result, many battery manufacturers have paid high certification fees but still cannot pass the above tests, resulting in property losses and project failures.

[0009] For example, the "National Standard for Electronic Cigarettes GB 41700-2022" has technical requirement 5.1.6 Pressure Relief Safety, which requires that when internal pressure occurs due to battery failure in an electronic cigarette device, the pressure relief direction should not be the same as the suction direction.

[0010] The existing technology also adjusts the design of the electronic cigarette device and adjusts the pressure relief direction to meet the test requirements, or eliminates existing products and molds. This method causes huge asset waste to electronic cigarette device manufacturers.

[0011] For example, SJ-T 11796-2022 "General Specifications for Lithium-ion Batteries and Battery Packs for Electronic Cigarettes", safety test 7.1 high-temperature external short circuit requires that a fully charged battery be heated to 57 ℃±4 ℃ and then the positive and negative terminals of the battery be connected with wires, and ensure that the total external resistance is no more than 20 mΩ. The test results show that the battery should not catch fire or explode.

[0012] The existing technology also has a method of lowering the internal resistance of the battery by adjusting the formula of the positive and negative electrode materials of the battery to be smaller than the external wire to meet the short-circuit test. However, since the performance of the positive and negative electrode materials of the battery has been pushed to the limit, this solution can no longer meet the increasingly stringent safety requirements, and also causes the existing batteries in the industry to fail the above short-circuit test, and fires are common.

[0013] In summary, the existing technology cannot provide low-cost, efficient and convenient solutions to battery manufacturers and users, so the battery itself with a circuit breaker protection function, which urgently needs to be invented. Utility Model Content

[0014] In view of this, the utility model provides a lithium battery with built-in temperature control protection function, which realizes short-circuit protection function through PTC components. By utilizing the light, thin and compact size of PTC components, the short-circuit protection function can be added to the battery without affecting the external dimensions of the battery. The utility model has the characteristics of high efficiency, convenience, high reliability, ultra-thin, ultra-micro structure, and standardized production, and is extremely practical.

[0015] The purpose of the utility model is achieved through the following technical solutions:

[0016] A lithium battery with a temperature control protection function comprises a core, a shell connected to the negative electrode of the core and wrapped around the outer periphery of the core, and a cover plate connected to the positive electrode of the core, wherein the cover plate comprises an upper cover sheet and a PTC component, and the PTC component is located below the upper cover sheet.

[0017] This battery utilizes PTC components to achieve short-circuit protection function, making full use of the advantage of PTC components' small size. Compared with the traditional external PTC and TCO plug-in methods, the use of PTC components as pole ears does not affect the external dimensions of the battery product. The battery product made with this cover has the advantage of regular appearance. It is not only easy to install and assemble, saving assembly costs, but also the battery product is not easily damaged during assembly, transportation, and storage. It has the characteristics of high efficiency, convenience, high reliability, ultra-thin, and ultra-micro structure. Manufacturers of products using this battery can achieve short-circuit protection function without increasing any processing costs and space dimensions, greatly improving battery safety and having extremely high practicality.

[0018] Optionally, in a possible implementation, the cover plate and the shell are connected together by means of, but not limited to, riveting, pressing, welding, or bonding. The shape of the cover plate matches the shape of the shell, including, but not limited to, circular and square. The connection methods of the upper cover sheet and the PTC component are not limited to riveting, bonding, injection molding, and pressing. The shape of the PTC component is consistent with that of the upper cover sheet and is in sheet form.

[0019] The cover is in the shape of a thin sheet as a whole, and its volume is extremely light, thin and compact. Compared with the traditional external PTC and TCO plug-in methods, this cover realizes the short-circuit protection function through PTC components, so the volume of this cover is significantly lower than other covers with low-temperature protection function on the market. This cover is installed on the battery product and will not affect the external dimensions of the battery product. The battery product made of this pole ear has the advantage of regular appearance. It is not only easy to install and assemble, saving assembly costs, but also the battery product is not easily damaged during assembly, transportation and storage.

[0020] Optionally, in a possible implementation, the PTC component includes a PTC body, an insulating coating on the periphery of the PTC body, a lower insulating layer connected to the bottom of the insulating coating, and an upper insulating layer connected to the top of the lower insulating layer.

[0021] The PTC components are protected by the shell, making them less susceptible to direct external forces and not being torn apart, greatly enhancing the structural stability of the short-circuit protection function, ensuring that the short-circuit protection function operates continuously and stably, and improving the safety of battery products. In addition to improving stability from the perspective of external factors, improvements are also made from the inside of the battery to further ensure the stability of the short-circuit protection function. Specifically, the PTC body is the main structure that realizes the temperature control function, which is wrapped by an insulating coating. The insulating coating can isolate the PTC body from the electrolyte to prevent the electrolyte from damaging the PTC body, so as to ensure that the PTC body can operate continuously and stably.

[0022] Optionally, in a possible implementation, the PTC body is completely wrapped by an insulating sheath.

[0023] In order to completely prevent the electrolyte from damaging the PTC body, the insulating coating wraps all the outer surfaces of the PTC body in an all-round way to ensure that there are no dead corners and no leakage, so as to ensure that the PTC body can operate continuously and stably. The material of the insulating coating can be but not limited to DNP black glue or letterpress white glue or PP glue or resin or Teflon glue. In addition to sealing the PTC components, the insulating coating can also play a reinforcing role and improve the structural strength of the PTC body.

[0024] Optionally, in a possible implementation, a stopper tape is further disposed in the shell, and the shell is a hard shell.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] This lithium battery with built-in temperature control protection function uses PTC components to achieve short-circuit protection function, fully utilizing the advantage of the small size of PTC components. Compared with the traditional external PTC and TCO plug-in methods, the pole ear with PTC component structure does not affect the external dimensions of the battery product. The battery product made with this pole ear has the advantage of regular appearance. It is not only easy to install and assemble, saving assembly costs, but also the battery product is not easy to be damaged during assembly, transportation, and storage. It has the characteristics of low cost, high efficiency and convenience, high reliability, ultra-thin, ultra-micro structure, etc. Product manufacturers using this battery can achieve short-circuit protection function without increasing any processing costs and space dimensions, greatly improving battery safety and having extremely high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is an exploded view of a lithium battery with a temperature control protection function according to an embodiment of the utility model.

[0029] Figure 2 This is a three-dimensional structural diagram of the PTC component of the embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0034] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0035] This embodiment provides a lithium battery with a temperature control protection function, including a core, a shell 1 connected to the negative electrode of the core and wrapped around the outer periphery of the core, and a cover plate 2 connected to the positive electrode of the core, the cover plate 2 includes an upper cover sheet 3 and a PTC component 4, and the PTC component 4 is located below the upper cover sheet 3. The PTC component is in the shape of a thin sheet, and the circuit breaker temperature of the PTC component 2 can be adjusted according to actual needs.

[0036] The temperature control temperature of the PTC component 4 is adjustable, and its size is small, so it can play the role of short-circuit protection, adding a layer of safety protection to the battery. Compared with the traditional external PTC and TCO plug-in method, the use of the PTC component 4 as the pole ear does not affect the external dimensions of the battery product. The battery product made using this cover plate 2 has the advantage of a regular appearance, which is not only easy to install and assemble, saving assembly costs, but also the battery product is not easy to be damaged during assembly, transportation, and storage. It has the characteristics of high efficiency, convenience, high reliability, ultra-thin, and ultra-micro structure. Manufacturers of products using this battery can achieve the short-circuit protection function without increasing any processing costs and space dimensions, greatly improving battery safety, and is extremely practical.

[0037] In addition, thanks to the thin sheet-like appearance of each structural part of this cover plate, the cover plate is used as a pole ear, and the minimum thickness of the pole ear can be controlled within 0.5 mm.

[0038] PTC components have the characteristic of adjustable circuit-breaking temperature. According to different product requirements, the temperature control temperature can be adjusted by adjusting the ratio of different semiconductor materials. And precise temperature control is achieved. The adjustable range of temperature control temperature includes but is not limited to 47℃~300℃. The current flowing through the first metal strip, the second metal strip and the PTC component generates self-heating. When the heating temperature is greater than the temperature control temperature, the resistance of the PTC component will increase sharply, and the circuit will be disconnected to play a safety protection role.

[0039] In this embodiment, the cover plate 2 and the housing 1 are connected together by means of, but not limited to, riveting, pressing, welding, and bonding. The shape of the cover plate 2 matches the shape of the housing 1, including but not limited to round and square. The connection method between the upper cover sheet 3 and the PTC component 4 is not limited to riveting, bonding, injection molding, and pressing. The shape of the PTC component 4 is consistent with that of the upper cover sheet 3 and is in the form of a sheet.

[0040] The cover plate 2 is in the shape of a thin sheet as a whole, and its volume is extremely light, thin and compact. Compared with the traditional external PTC and TCO plug-in methods, thanks to the fact that this cover plate 2 realizes the short-circuit protection function through the PTC component 4, the volume of this cover plate 2 is significantly lower than other cover plates 2 with low-temperature protection function on the market. This cover plate 2 is assembled on the battery product and will not affect the external dimensions of the battery product. The battery product made of this pole ear has the advantage of regular appearance. It is not only easy to install and assemble, saving assembly costs, but also the battery product is not easily damaged during assembly, transportation and storage.

[0041] In this embodiment, the PTC component 4 includes a PTC body 41 , an insulating coating 42 surrounding the PTC body 41 , a lower insulating layer 43 connected to the lower side of the insulating coating 42 , and an upper insulating layer 44 connected to the upper side of the lower insulating layer 43 .

[0042] The PTC component 4 is protected by the shell 1, making it less susceptible to direct external forces and will not be torn apart, greatly enhancing the structural stability of the short-circuit protection function, ensuring that the short-circuit protection function operates continuously and stably, and improving the safety of battery products. In addition to improving stability from the perspective of external factors, improvements are also made from the inside of the battery to further ensure the stability of the short-circuit protection function. Specifically, the PTC body 41 is the main structure for achieving temperature control, which is wrapped by an insulating sheath 42. The insulating sheath 42 can isolate the PTC body 41 from the electrolyte to prevent the electrolyte from damaging the PTC body 41, so as to ensure that the PTC body 41 can operate continuously and stably.

[0043] In this embodiment, the PTC body 41 is completely wrapped by the insulating sheath 42 .

[0044] In order to completely prevent the electrolyte from damaging the PTC body 41, the insulating coating 42 wraps all the outer surfaces of the PTC body 41 in an all-round manner to ensure that there are no dead corners and no leakage, so as to ensure that the PTC body 41 can operate continuously and stably. The material of the insulating coating 42 can be, but is not limited to, DNP black glue, letterpress white glue, PP glue, resin, or Teflon glue. In addition to sealing the PTC component 4, the insulating coating 42 can also play a reinforcing role and improve the structural strength of the PTC body 41. The sealant is coated on the periphery of the PTC body by heat sealing. The material of the sealant can be DNP black glue, letterpress white glue, PP glue, or Teflon. The coating of the sealant can effectively strengthen the structural strength of the solder joints in the connection area.

[0045] In this embodiment, a stopper tape is also provided in the housing 1, and the housing 1 is a hard shell.

[0046] The cover plate is widely used as a tab, and can be applied to lithium-ion batteries, sodium-ion batteries, chemical batteries, secondary batteries and other fields.

[0047] The above only discloses one method of connecting the core and the cover plate, which is only for the convenience of describing the present application and simplifying the description, and does not specifically indicate or imply that the components must be connected in the above manner. Therefore, it cannot be understood as a limitation of the present application. Replacing the connection method of the positive and negative poles should also be deemed to be within the scope of protection of the present application.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery with built-in temperature control protection function, characterized in that: It includes a core, a shell connected to the negative electrode of the core and wrapped around the periphery of the core, and a cover plate connected to the positive electrode of the core, the cover plate includes an upper cover plate and a PTC component, the PTC component is located below the upper cover plate, and the PTC component includes a PTC body, an insulating sheath connected to the periphery of the PTC body, a lower insulating layer connected to the bottom of the insulating sheath, and an upper insulating layer connected to the top of the lower insulating layer.

2. The lithium battery with temperature control protection function according to claim 1, characterized in that: The shape of the cover plate matches the shape of the shell, including but not limited to round and square.

3. The lithium battery with temperature control protection function according to claim 1, characterized in that: The PTC component has the same shape as the upper cover sheet and is in sheet shape.

4. The lithium battery with temperature control protection function according to claim 1, characterized in that: The PTC body is completely wrapped by the insulating sheath.

5. The lithium battery with temperature control protection function according to claim 1, characterized in that: A stopper tape is also arranged in the shell.

6. The lithium battery with temperature control protection function according to claim 1, characterized in that: The shell is a hard shell.

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