Top cover assembly and battery
By incorporating a heating element and a thermistor in the top cover assembly of a lithium-ion battery, the sealing structure is heated by the battery cell's charge, thus solving the problems of sealing failure and slow ion transport at low temperatures and improving the battery's adaptability and stability in low-temperature environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
- Filing Date
- 2025-03-28
- Publication Date
- 2026-04-21
AI Technical Summary
Existing lithium-ion batteries suffer from sealing failure and slow ion transport in low-temperature environments, leading to leakage and shortened cell lifespan, posing safety risks.
Design a top cover assembly including a positive terminal, a negative terminal, a first heating part, a second heating part, connecting wires and a thermistor. The heating part is connected by the thermistor's resistance decreasing as the temperature decreases. The battery cell's own charge is used to heat the sealing structure to ensure sealing performance.
In low-temperature environments, the heating element connects to heat the battery cell and sealing structure, improving the battery's sealing performance and adaptability, and ensuring battery stability and safety.
Smart Images
Figure CN224153460U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery insulation technology, and in particular to a top cover assembly and a battery. Background Technology
[0002] Lithium iron phosphate batteries possess advantages such as high operating voltage, high energy density, long cycle life, good safety performance, low self-discharge rate, and no memory effect, making them widely used in various complex scenarios such as digital products, automobiles, ships, and container energy storage. However, as applications extend to high-altitude and mid-to-high latitude regions, leakage of lithium-ion batteries during low-temperature storage has become increasingly common. This is because current technologies typically use fluororubber for the terminal seals on the top cover, and fluororubber tends to harden and lose elasticity at low temperatures (-20°C and below), potentially leading to leakage or seal failure.
[0003] Furthermore, at low temperatures, lithium-ion batteries themselves experience slow ion transport and reduced electrolyte conductivity, resulting in a sharp increase in internal impedance, which severely affects cell lifespan and poses significant safety risks.
[0004] Therefore, there is an urgent need to provide a top cover assembly and battery to address the problems existing in the prior art to some extent. Utility Model Content
[0005] The purpose of this invention is to provide a top cover assembly that optimizes the battery top cover assembly to a certain extent and ensures the cell temperature of the battery in low-temperature environments.
[0006] This utility model provides a top cover assembly, including a top cover body, a first heating part, a second heating part, a thermistor, a connecting wire, a positive terminal, and a negative terminal; the positive terminal and the negative terminal are disposed opposite to each other on the top cover body, the first heating part is in contact with the positive terminal, the second heating part is in contact with the negative terminal, and the connecting wire connects the first heating part and the second heating part; the thermistor is disposed on the connecting wire, and the resistance of the thermistor decreases as the temperature decreases.
[0007] The first heating element is arranged circumferentially along the positive electrode post, and the second heating element is arranged circumferentially along the negative electrode post.
[0008] Specifically, the connecting wire is a copper wire, and both ends of the connecting wire are respectively connected to the first heating part and the second heating part.
[0009] Furthermore, an insulating layer is formed on the surface of the top cover body facing the battery cell, and the insulating layer at least covers the corresponding areas of the first heating part, the second heating part, and the connecting wire.
[0010] Furthermore, the insulating layer is an organic insulating coating.
[0011] The thermistor is a positive temperature coefficient thermistor, and the temperature coefficient of the thermistor changes abruptly between -30℃ and 0℃.
[0012] Specifically, the first heating element is embedded in the positive electrode post, and the second heating element is embedded in the negative electrode post.
[0013] Furthermore, the resistance value of the thermistor after the sudden change is not less than (20 / battery capacity) MΩ.
[0014] Furthermore, the resistance of both the first heating element and the second heating element is not less than (1.2 / battery capacity) MΩ.
[0015] Compared with the prior art, the top cover assembly provided by this utility model has the following advantages:
[0016] The top cover assembly provided by this utility model includes a top cover body, a first heating part, a second heating part, a thermistor, a connecting wire, a positive terminal and a negative terminal; the positive terminal and the negative terminal are disposed opposite to each other on the top cover body, the first heating part is in contact with the positive terminal, the second heating part is in contact with the negative terminal, and the connecting wire connects the first heating part and the second heating part, the thermistor is disposed on the connecting wire, and the resistance of the thermistor decreases as the temperature decreases.
[0017] Analysis shows that by setting a first heating element at the position corresponding to the positive terminal and a second heating element at the position corresponding to the negative terminal, with the first heating element in contact with the positive terminal and the second heating element in contact with the negative terminal, and connecting the first heating element and the second heating element with a connecting wire, the positive and negative terminals can be connected, thus achieving the purpose of connecting and heating.
[0018] Furthermore, this application incorporates a thermistor on the connecting line, and the thermistor's resistance decreases as temperature decreases. Specifically, when the cell temperature rises, the thermistor's resistance increases, thus blocking the connection between the first and second heating parts. Conversely, when the cell temperature decreases, the thermistor's resistance decreases, allowing the first and second heating parts to connect. This achieves the purpose of heating the cell and the fluororubber used for sealing, ensuring sealing performance and improving the overall battery's adaptability to low-temperature environments. Moreover, since the first and second heating parts provided in this application utilize the cell's own charge for heating, no other structural assistance is required, resulting in a simple structure and fast response.
[0019] In addition, this utility model also provides a battery, including a cell, a casing, an insulating part, and the above-mentioned top cover assembly; the top cover assembly is connected to the casing to form a sealed space, and the cell is disposed in the sealed space; the insulating part is connected to the surface of the top cover body facing the cell, and the first heating part, the connecting wire, the second heating part, and the thermistor are located between the top cover body and the insulating part.
[0020] The battery using the top cover assembly provided in this application can form a sealed space to accommodate the battery cell by the top cover assembly and the housing. The insulating part in this application is made of lower plastic, which can achieve insulation between the top cover assembly and the battery cell. By placing the first heating part, the connecting wire, the second heating part and the thermistor between the top cover body and the insulating part, it is possible to further prevent the first heating part, the connecting wire, the second heating part and the thermistor from contacting the electrolyte, prevent corrosion, and ensure battery stability. Attached Figure Description
[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the overall structure of the top cover assembly provided in an embodiment of the present utility model.
[0023] In the diagram: 1-Top cover body; 2-First heating part; 3-Second heating part; 4-Connecting wire; 5-Thermistor; 6-Positive terminal; 7-Negative terminal. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0025] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0027] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0029] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device during use or operation.
[0030] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0031] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.
[0032] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have various constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis that they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0033] like Figure 1 As shown, this utility model provides a top cover assembly, including a top cover body 1, a first heating part 2, a second heating part 3, a thermistor 5, a connecting wire 4, a positive terminal 6, and a negative terminal 7; the positive terminal 6 and the negative terminal 7 are disposed opposite to each other on the top cover body 1, the first heating part 2 is in contact with the positive terminal 6, the second heating part 3 is in contact with the negative terminal 7, and the connecting wire 4 connects the first heating part 2 and the second heating part 3. The thermistor 5 is disposed on the connecting wire 4, and the resistance of the thermistor 5 decreases as the temperature decreases.
[0034] Compared with the prior art, the top cover assembly provided by this utility model has the following advantages:
[0035] The top cover assembly provided by this utility model provides a first heating part 2 at the position corresponding to the positive electrode post 6 and a second heating part 3 at the position corresponding to the negative electrode post 7. The first heating part 2 is in contact with the positive electrode post 6 and the second heating part 3 is in contact with the negative electrode post 7. The first heating part 2 and the second heating part 3 are connected by a connecting line 4, thereby connecting the positive electrode post 6 and the negative electrode post 7 to achieve the purpose of connecting and heating.
[0036] Furthermore, since a thermistor 5 is further provided on the connecting line 4 in this application, and the resistance of the thermistor 5 decreases as the temperature decreases, that is, when the cell temperature rises, the resistance of the thermistor 5 increases, thereby blocking the connection between the first heating part 2 and the second heating part 3. However, when the cell temperature decreases, the resistance of the thermistor 5 decreases, thereby enabling the first heating part 2 and the second heating part 3 to connect. This achieves the purpose of heating the cell and the fluororubber used for sealing, ensuring sealing performance and improving the overall battery's adaptability to low-temperature environments. Moreover, since the first heating part 2 and the second heating part 3 provided in this application utilize the cell's own electrical charge for heating, no other structural assistance is required, resulting in a simple structure and fast response.
[0037] Optionally, such as Figure 1 As shown, in this application, the first heating part 2 is arranged along the circumference of the positive electrode post 6, and the second heating part 3 is arranged along the circumference of the negative electrode post 7.
[0038] In this application, the first heating part 2 is arranged around the positive electrode post 6, and the second heating part 3 is arranged around the negative electrode post 7, thereby enabling more uniform heat transfer during the heating process.
[0039] Preferably, the connecting line 4 in this application is a copper wire, and both ends of the connecting line 4 are respectively connected to the first heating part 2 and the second heating part 3.
[0040] Because copper has good electrical conductivity, using copper wire for connecting wire 4 can make the overall structure more stable.
[0041] Preferably, the first heating part 2 and the second heating part 3 in this application may be made of, but are not limited to, nickel-chromium alloy, iron-chromium-aluminum alloy or copper-nickel alloy.
[0042] Accordingly, the resistance of the first heating part 2 and the second heating part 3 in this application is not less than (1.2 / battery capacity) MΩ.
[0043] Preferably, the top cover body 1 of this application has an insulating layer formed on the surface facing the battery cell, and the insulating layer at least covers the corresponding areas of the first heating part 2, the second heating part 3 and the connecting wire 4.
[0044] By providing an insulating layer on the surface of the top cover body 1 facing the battery cell, and with the first heating part 2, the second heating part 3, the connecting wire 4, and the thermistor 5 all located between the top cover body 1 and the insulating layer, it is possible to prevent the first heating part 2, the second heating part 3, and the connecting wire 4 from making contact with other structures after assembly, thus avoiding the problem of affecting the overall battery stability and causing the aforementioned heating method to fail. Furthermore, the insulating layer also satisfies insulation testing requirements, preventing short circuits between the casing and the positive and negative terminals 7.
[0045] Preferably, the insulating layer in this application is an organic insulating coating or an inorganic insulating coating.
[0046] When organic materials are used for the insulation layer, the insulation layer can be polyethylene, polytetrafluoroethylene, polyimide, or polyvinylidene fluoride. When inorganic materials are used, the insulation layer can be silicon oxide, silicon nitride, aluminum oxide, or aluminum nitride.
[0047] Optionally, the thermistor 5 in this application is a positive temperature coefficient thermistor 5, and the temperature coefficient abrupt change point of the thermistor 5 is between -30℃ and 0℃. The resistance value of the thermistor 5 after the abrupt change is not less than (20 / battery capacity) MΩ.
[0048] Preferably, in this application, the first heating part 2 is embedded in the positive electrode post 6 and the second heating part 3 is embedded in the negative electrode post 7, thereby ensuring the stability of the setting of the first heating part 2 and the second heating part 3, and enabling the top cover body 1 to form a flat plane, avoiding affecting the assembly and connection of other structures.
[0049] It should be noted that the positive and negative terminals in this application may include a column and a base. Accordingly, the first heating part 2 and the second heating part 3 may be embedded in the outer wall of the column or embedded in the base to ensure the stability of the first heating part 2 and the second heating part 3.
[0050] In addition, this utility model also provides a battery, including a battery cell, a housing, an insulating part, and the aforementioned top cover assembly; the top cover assembly is connected to the housing to form a sealed space, and the battery cell is disposed in the sealed space; the insulating part is connected to the surface of the top cover body 1 facing the battery cell, and the first heating part 2, the connecting wire 4, the second heating part 3, and the thermistor 5 are located between the top cover body 1 and the insulating part.
[0051] The battery using the top cover assembly provided in this application can form a sealed space to accommodate the battery cell by the top cover assembly and the housing. The insulating part in this application is made of lower plastic, which can achieve insulation between the top cover assembly and the battery cell. By placing the first heating part 2, the connecting wire 4, the second heating part 3 and the thermistor 5 between the top cover body 1 and the insulating part, it is possible to further prevent the first heating part 2, the connecting wire 4, the second heating part 3 and the thermistor 5 from contacting the electrolyte, prevent corrosion, and ensure battery stability.
[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A cap assembly, characterized by, It includes a top cover body (1), a first heating part (2), a second heating part (3), a thermistor (5), a connecting wire (4), a positive terminal (6) and a negative terminal (7); The positive terminal (6) and the negative terminal (7) are disposed opposite to each other on the top cover body (1). The first heating part (2) is in contact with the positive terminal (6), and the second heating part (3) is in contact with the negative terminal (7). The connecting line (4) connects the first heating part (2) and the second heating part (3). The thermistor (5) is disposed on the connecting line (4). The resistance of the thermistor (5) decreases as the temperature decreases.
2. The roof assembly of claim 1, wherein, The first heating part (2) is arranged along the circumference of the positive electrode post (6), and the second heating part (3) is arranged along the circumference of the negative electrode post (7).
3. The roof assembly of claim 1, wherein, The connecting line (4) is a copper wire, and both ends of the connecting line (4) are respectively connected to the first heating part (2) and the second heating part (3).
4. The roof assembly of claim 1, wherein, An insulating layer is formed on the surface of the top cover body (1) facing the battery cell, and the insulating layer covers at least the corresponding areas of the first heating part (2), the second heating part (3) and the connecting line (4).
5. The roof assembly of claim 4, wherein, The insulating layer is an organic insulating coating.
6. The roof assembly of claim 1, wherein, The thermistor (5) is a positive temperature coefficient thermistor (5), and the temperature coefficient of the thermistor (5) changes abruptly between -30℃ and 0℃.
7. The roof assembly of claim 1, wherein, The first heating part (2) is embedded in the positive electrode post (6), and the second heating part (3) is embedded in the negative electrode post (7).
8. The roof assembly of claim 1, wherein, The resistance of the thermistor (5) after the sudden change is not less than (20 / battery capacity) MΩ.
9. The roof assembly of claim 1, wherein, The resistance of both the first heating part (2) and the second heating part (3) is not less than (1.2 / battery capacity) MΩ.
10. A battery, characterized by Includes the battery cell, housing, insulation, and the top cover assembly as described in any one of claims 1-9; The top cover assembly is connected to the housing to form a sealed space, and the battery cell is disposed within the sealed space; The insulating part is connected to the surface of the top cover body (1) facing the battery cell, and the first heating part (2), the connecting line (4), the second heating part (3) and the thermistor (5) are located between the top cover body (1) and the insulating part.