Battery explosion-proof valve protection structure and battery

Abstract

The utility model relates to a battery explosion-proof valve protection structure, which is formed by sequentially overlapping a first base material layer, a first back adhesive layer, a second base material layer and a second back adhesive layer, the surface of the first base material layer is not provided with holes, and the first back adhesive layer is provided with a first gas guide channel capable of conducting a cavity inside a battery and gas outside a battery cell. And the second base material layer is sectioned to form a gas guide channel II capable of ensuring the smoothness of the internal space of the battery cavity. The explosion-proof valve protection structure is simple and ingenious, and is formed by compounding the two layers of base materials, and the middle layer base material, namely the second base material layer and the first gum layer, retains or forms a gas channel between the explosion-proof valve cavity and the exterior of the battery cell, so that external impurities are prevented from entering the interior, and the use performance of the explosion-proof valve protection structure is ensured; and the service performance of the battery is enhanced and the service life of the battery is prolonged. The battery also has the advantages that external impurities are prevented from entering the battery, and the use performance of the anti-explosion valve protection structure is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a battery explosion-proof valve protection structure. Background Art

[0002] Lithium batteries are a type of chemical power source that uses lithium metal or lithium ions as electrode materials. They have the characteristics of high energy density, long life, low self-discharge rate, and fast charging capability. Lithium batteries are widely used in many fields such as portable electronic devices, electric vehicles, and energy storage systems.

[0003] At present, square shell batteries are usually packaged with aluminum shells and top covers to contain the electrode group and electrolyte. In current technology, due to improper working conditions and abuse, a large amount of gas will be generated inside the battery, accompanied by a sharp increase in temperature. Figure 7 and Figure 8 As shown, the existing square shell battery cell will be provided with an explosion-proof valve 6' on the battery cell top cover 5'. When a large amount of gas is generated in the battery, the explosion-proof valve 6' will be opened to release the pressure, which greatly improves the safety performance of the battery. The explosion-proof valve 6 is usually in the form of a sheet, so it is often called an explosion-proof sheet. Since the explosion-proof valve 6' is usually made of a thin aluminum sheet that is punched and notched and welded to the step on the lower surface of the explosion-proof valve cavity of the battery cell top cover 5'; and the thickness of the explosion-proof valve 6' is usually 0.5mm, and the residual thickness of the notch is 0.02mm. In addition to allowing normal gas creep, the explosion-proof sheet valve' is not allowed to be damaged by any external force or foreign matter, so a protective film 7', also called an explosion-proof film, will be attached to the upper surface of the explosion-proof valve cavity of the battery cell top cover 5'. After the explosion-proof valve 6' is attached, an explosion-proof valve cavity will be formed in the thickness direction of the top cover sheet. When there is high temperature, the expansion of the normal pressure gas in the cavity will cause problems such as wrinkles in the explosion-proof film, affecting the appearance and even losing the protective function. In order to verify the air tightness of the battery cell top cover 5', helium leak detection is usually performed. When the explosion-proof valve 6' is pasted with a film, it will affect the detection accuracy of the explosion-proof disc position. Conventional manufacturers will set holes on the film-pasting substrate to ensure the free flow of gas in the explosion-proof valve cavity, but there is still a risk of foreign matter entering, affecting the performance of the battery. Utility Model Content

[0004] In order to overcome the defects in the above-mentioned prior art, the first utility model purpose of the utility model is to provide a battery explosion-proof valve protection structure, which is simple and ingenious, can ensure the normal flow of gas between the explosion-proof valve cavity and the outside world, and can minimize the entry of foreign matter into the explosion-proof valve cavity and damage the notch, ensure the performance of the battery, extend the service life of the battery, enhance the user experience, and facilitate the promotion and application of the above-mentioned battery explosion-proof valve protection structure in the field of lithium battery manufacturing technology. The second utility model purpose of the utility model is to provide a battery, which is applied with the above-mentioned battery explosion-proof valve protection structure, which has the advantages of excellent performance and long life.

[0005] The battery explosion-proof valve protection structure and a battery are technically related to each other and belong to the same utility model concept.

[0006] In order to achieve the above-mentioned first utility model purpose, the utility model adopts the following technical scheme: a battery explosion-proof valve protection structure, including a first substrate layer, a first back adhesive layer, a second substrate layer and a second back adhesive layer, and the first substrate layer, the first back adhesive layer, the second substrate layer and the second back adhesive layer are overlapped in sequence, the first substrate layer surface is not open, the first back adhesive layer forms a gas conduction channel 1 that can make the internal cavity of the battery and the gas outside the battery cell conduct, and the second substrate layer is cut to form a gas conduction channel 2 that can ensure the smooth flow of the internal space of the battery cavity.

[0007] As a preferred solution of the utility model, the air guide channel 1 includes an annular air channel and a cross air channel, the cross air channel is arranged vertically to the annular air channel, the annular air channel and the cross air channel are both arranged at the center position of the first back adhesive layer, and the cross air channel extends to the edge of the first back adhesive layer.

[0008] As a preferred solution of the utility model, the second air guide channel is ring-shaped and communicates with the annular airway.

[0009] As a preferred solution of the utility model, the second adhesive layer is an annular local adhesive layer, which is used to adhere to the outer circle of the explosion-proof valve cavity at the battery top cover.

[0010] As a preferred solution of the present invention, the thickness of the first substrate layer and the second substrate layer is 0.02-1 mm.

[0011] As a preferred solution of the present invention, the thickness of the first substrate layer and the second substrate layer is 0.05 mm.

[0012] As a preferred solution of the present invention, the thickness of the first adhesive layer and the second adhesive layer is 0.02-1 mm.

[0013] As a preferred solution of the utility model, the thickness of the first adhesive layer and the second adhesive layer is 0.07 mm, and the total thickness of the battery explosion-proof valve protection structure does not exceed 3.2 mm.

[0014] As a preferred solution of the present invention, the first substrate layer and the second substrate layer are both made of PET material.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: a battery explosion-proof valve protection structure in the utility model is simple and ingenious, and is formed by arranging a first substrate layer, a first back adhesive layer, a second substrate layer and a second back adhesive layer, that is, a double-layer substrate is composited, and the intermediate layer substrate, that is, the second substrate layer and the first back adhesive layer, retain or form a gas channel between the explosion-proof valve cavity and the outside of the battery cell, thereby preventing external impurities from entering the interior while ensuring the performance of the explosion-proof valve protection structure, thereby enhancing the performance of the battery, extending the service life of the battery, and reducing the user's use cost, which is conducive to the promotion and application of the above-mentioned battery explosion-proof valve protection structure in the field of battery manufacturing technology.

[0016] In order to achieve the above-mentioned second utility model purpose, the utility model adopts the following technical scheme: a battery, which is applied with the above-mentioned battery explosion-proof valve protection structure; it also has a battery cover plate, the battery cover plate has an explosion-proof port, and the above-mentioned battery explosion-proof valve protection structure is installed at the explosion-proof port.

[0017] Compared with the prior art, the beneficial effect of the utility model is that a battery in the utility model, by applying the above-mentioned battery explosion-proof valve protection structure, also has the advantages of preventing external impurities from entering the interior while ensuring the performance of the explosion-proof valve protection structure, thereby enhancing the performance of the battery and extending the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a battery explosion-proof valve protection structure in an embodiment of the utility model;

[0019] Figure 2 This is a structural cross-sectional view of a battery explosion-proof valve protection structure in an embodiment of the utility model;

[0020] Figure 3 It is a schematic structural diagram of the first substrate layer in the implementation of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of the first adhesive layer in the implementation of the utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the second substrate layer in the implementation of the utility model;

[0023] Figure 6 It is a schematic diagram of the structure of the second adhesive layer in the utility model;

[0024] Figure 7 It is a structural schematic diagram of an explosion-proof structure in the prior art;

[0025] Figure 8 It is a schematic diagram of the structural disassembly of an explosion-proof structure in the prior art.

[0026] Figure numerals: 1, first substrate layer; 2, first adhesive layer; 2-1, air guide channel one; 2-1-1, annular air channel; 2-1-2, cross air channel; 3, second substrate layer 3-1, air guide channel two; 4, second adhesive layer; 5', battery cell top cover; 6', explosion-proof valve; 7', protective film. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described below by specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They 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 operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0030] In the prior art, after the explosion-proof valve 6' is pasted, an explosion-proof valve cavity will be formed in the thickness direction of the battery top cover 5'. When high temperature exists, the expansion of the atmospheric pressure gas in the cavity will cause the explosion-proof film, i.e., the protective film 7', to wrinkle and other problems, affecting the appearance or even losing the protective function.

[0031] Embodiment 1:

[0032] In order to solve the above technical problems, Figures 1 to 6As shown, a battery explosion-proof valve protection structure is mainly composed of a first substrate layer 1, a first back adhesive layer 2, a second substrate layer 3 and a second back adhesive layer 4, and is formed by the above-mentioned first substrate layer 1, the above-mentioned first back adhesive layer 2, the above-mentioned second substrate layer 3 and the above-mentioned second back adhesive layer 4 being superimposed in sequence. Through the combination of multiple substrates and back adhesive layers, the overall strength of the battery explosion-proof valve protection structure is improved, so that it can better resist external impact or pressure, reduce or avoid the probability of deformation of the explosion-proof valve, thereby ensuring its appearance while ensuring its practical performance. The surface of the above-mentioned first substrate layer 1 is not provided with holes to ensure that the inside of the battery is isolated from the external environment, prevent the intrusion of moisture, dust, etc., and also prevent internal gas leakage. The above-mentioned first back adhesive layer 2 is formed with a gas-conducting channel 2-1 that can conduct the gas between the internal cavity of the battery and the gas outside the battery cell. The gas-conducting channel 2-1 can enable gas exchange between the inside of the battery and the external environment, which helps to maintain the pressure balance inside the battery. When the battery generates gas during the charging and discharging process, the gas-conducting channel 2-1 can provide a release path to prevent the internal pressure from accumulating too high. In the event that the internal pressure of the battery increases abnormally, the air guide channel 2-1 can also serve as a safety valve, allowing gas to be discharged through the above-mentioned first adhesive layer 2, thereby reducing the risk of explosion or fire. The air guide channel 2-1 can also improve the heat dissipation efficiency of the battery. By allowing air circulation, it can help dissipate the heat generated by the battery during the charging and discharging process, thereby reducing the battery temperature and improving the battery performance and life. By allowing gas to exchange between the internal and external environments of the battery, the air guide channel 2-1 helps to stabilize the internal environment of the battery, thereby improving the overall performance of the battery. The above-mentioned second substrate layer 3 is cut to form an air guide channel 2 3-1 that can ensure the smooth flow of the internal space of the battery cavity. The air guide channel 2 3-1 can increase the air flow inside the battery and help dissipate the heat generated by the battery cell during the charging and discharging process, thereby improving the heat dissipation efficiency and preventing the battery from overheating.

[0033] Specifically, the above-mentioned air-guiding channel 2-1 in this embodiment includes an annular airway 2-1-1 and a cross airway 2-1-2. The annular airway can improve the uniformity of air flow inside the battery, help to more evenly dissipate the heat generated inside the battery, and avoid local overheating. The cross airway design allows air to flow in different directions, increases the path of airflow, and improves the heat dissipation efficiency and the efficiency of gas exchange inside the battery. The design of the annular and cross airways helps to form a balanced pressure distribution inside the battery and reduce structural deformation or damage that may be caused by uneven pressure. The above-mentioned cross airway 2-1-2 is arranged vertically with the above-mentioned annular airway 2-1-1. The vertically arranged airway can form a three-dimensional airflow path, allowing air to flow in multiple directions inside the battery, thereby improving the heat dissipation efficiency and gas exchange speed. Through the vertically crossed airway design, the airflow can be distributed more evenly, avoiding excessive or weak airflow in certain areas, and ensuring the uniformity of the temperature inside the battery. The vertically crossed airways also help to form an effective heat exchange, because the air can contact the battery cells inside the battery when passing through the annular airway, and the cross airway can further disperse the heat. The vertically arranged air channel also increases the surface area for gas exchange, which helps the gas inside the battery to exchange with the external environment faster and maintain the stability of the internal environment. The above-mentioned annular air channel 2-1-1 and the above-mentioned cross air channel 2-1-2 are both arranged at the center position of the above-mentioned first adhesive layer 2. The center position is generally considered to be the natural center point of the gas flow inside the battery. Setting the air channel at the center can more effectively concentrate and guide the airflow and improve the heat dissipation efficiency. The air channel at the center helps to evenly disperse the heat from the central area of ​​the battery to the edge, reduce the generation of hot spots, and thus improve the overall thermal stability of the battery. The air channel at the center helps to form a uniform pressure distribution inside the battery and reduce deformation or damage that may be caused by uneven pressure. The above-mentioned cross air channel 2-1-2 is extended to the edge of the above-mentioned first adhesive layer 2. The air channel extending to the edge helps to conduct heat from the center of the battery to the edge more effectively, and uses the area of ​​the entire adhesive layer for heat dissipation. The air channel extending to the edge can improve the gas flow path inside the battery and ensure that the gas can be evenly distributed from the center to the edge. The airway openings on the edge also help improve the efficiency of gas exchange between the battery and the external environment, maintaining the stability of the internal environment of the battery.

[0034] In order to achieve more efficient heat dissipation, more uniform pressure distribution, faster gas exchange and improve the overall performance and safety of the battery, in this embodiment, the above-mentioned air guide channel 2 3-1 is ring-shaped and is connected to the above-mentioned annular air channel 2-1-1.

[0035] The second adhesive layer 4 is an annular local adhesive, which is used to adhere to the outer ring of the explosion-proof valve cavity at the top cover of the battery. The annular local adhesive can provide targeted bonding in a specific area, rather than the entire surface of the second substrate layer 3, so as to reduce unnecessary material use while maintaining the required bonding strength. The local adhesive design also helps the thermal management of the battery. By controlling the position and area of ​​the adhesive, the heat conduction and heat dissipation path inside the battery can be affected. The annular adhesive also helps to form a uniform pressure distribution on the substrate layer, reducing deformation or damage that may be caused by uneven pressure.

[0036] The thickness of the first substrate layer 1 and the second substrate layer 3 is 0.02-1 mm, preferably 0.05 mm, to avoid the first substrate layer 1 and the second substrate layer 3 being too thin or too thick. Thinner materials can reduce the overall weight of the battery, which is an important consideration for applications such as portable devices or electric vehicles. Using thinner substrate layers can also reduce the volume and weight of the battery, thereby accommodating more electrochemically active materials in the same volume and increasing the energy density of the battery. Thin materials are generally lower in cost and can reduce the production cost of the battery. The thickness can also balance the thermal conductivity and insulation requirements of the battery, which helps with the thermal management of the battery.

[0037] The thickness of the first adhesive layer 2 and the second adhesive layer 4 is 0.02-1mm. The appropriate thickness of the adhesive layer can provide sufficient bonding strength to ensure the fixation and structural stability between the explosion-proof valve protection structures. A thinner adhesive layer can also reduce material usage, thereby reducing production costs. The thickness of the first adhesive layer 2 and the second adhesive layer 4 is 0.07mm, which provides sufficient bonding strength while maintaining the flexibility and adaptability of the material. The total thickness of the battery explosion-proof valve protection structure does not exceed 3.2mm, which helps to improve the energy density of the battery, that is, more energy can be stored in the same volume. A thinner structure often also means light weight and easy assembly.

[0038] The first substrate layer 1 and the second substrate layer 3 are both made of PET. PET has good mechanical properties, including high strength and toughness, which enables it to provide the necessary structural support and protection for the battery. PET is resistant to many chemicals, including common battery electrolytes, which helps protect the explosion-proof valve protection structure from corrosion. PET has a high melting point and good thermal stability, and can remain stable within the temperature range generated during the battery charging and discharging process. PET is selected as the material for the first substrate layer 1 and the second substrate layer 3 in order to take advantage of its mechanical properties, chemical stability, thermal properties, processing performance, cost-effectiveness, light weight, environmental friendliness, electrical insulation, weather resistance, gas barrier properties, compatibility, and meeting safety standards.

[0039] A battery explosion-proof valve protection structure in the present embodiment is simple and ingenious. It is formed by arranging a first substrate layer 1, a first back adhesive layer 2, a second substrate layer 3 and a second back adhesive layer 4, that is, a double-layer substrate is composited. The intermediate substrate layer, that is, the second substrate layer 3 and the first back adhesive layer 2, retain or form a gas channel between the explosion-proof valve cavity and the outside of the battery cell, thereby preventing external impurities from entering the interior while ensuring the performance of the explosion-proof valve protection structure, thereby enhancing the performance of the battery, extending the service life of the battery, and reducing the user's use cost, which is conducive to the promotion and application of the above-mentioned battery explosion-proof valve protection structure in the field of battery manufacturing technology.

[0040] Embodiment 2:

[0041] In the battery explosion-proof valve protection structure of the present embodiment, the annular airway 2-1-1 and the cross airway 2-1-2 may also be in other shapes, which are not limited here.

[0042] Embodiment 3:

[0043] A battery, using the above-mentioned battery explosion-proof valve protection structure; also includes a battery cover plate, the battery cover plate has an explosion-proof hole, the battery explosion-proof valve protection structure is installed at the explosion-proof hole, which also has the advantages of preventing external impurities from entering the interior while ensuring the performance of the explosion-proof valve protection structure, thereby enhancing the performance of the battery and extending the service life of the battery.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0045] Although this article uses more of the following terms: 1, first substrate layer; 2, first adhesive layer; 2-1, air channel 1; 2-1-1, annular air channel; 2-1-2, cross air channel; 3, second substrate layer 3-1, air channel 2; 4, second adhesive layer; 5', battery cell top cover; 6', explosion-proof valve; 7', protective film, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A battery explosion-proof valve protection structure, characterized in that: The battery comprises a first substrate layer (1), a first back adhesive layer (2), a second substrate layer (3) and a second back adhesive layer (4), and is formed by stacking the first substrate layer (1), the first back adhesive layer (2), the second substrate layer (3) and the second back adhesive layer (4) in sequence, wherein the first substrate layer (1) has no openings on its surface, the first back adhesive layer (2) forms a gas conduction channel 1 (2-1) capable of conducting gas between the internal cavity of the battery and the gas outside the battery cell, and the second substrate layer (3) is cut to form a gas conduction channel 2 (3-1) capable of ensuring smooth flow of the internal space of the battery cavity.

2. A battery explosion-proof valve protection structure according to claim 1, characterized in that: The air guide channel 1 (2-1) comprises an annular air channel (2-1-1) and a cross air channel (2-1-2), the cross air channel (2-1-2) being arranged perpendicularly to the annular air channel (2-1-1), the annular air channel (2-1-1) and the cross air channel (2-1-2) being arranged at the center of the first adhesive layer (2), and the cross air channel (2-1-2) extending to the edge of the first adhesive layer (2).

3. A battery explosion-proof valve protection structure according to claim 2, characterized in that: The second air guide channel (3-1) is in a ring shape and is communicated with the annular air channel (2-1-1).

4. A battery explosion-proof valve protection structure according to claim 3, characterized in that: The second adhesive layer (4) is a ring-shaped local adhesive, which is used to adhere to the outer circle of the explosion-proof valve cavity at the top cover of the battery.

5. A battery explosion-proof valve protection structure according to claim 4, characterized in that: The thickness of the first substrate layer (1) and the second substrate layer (3) is 0.02-1 mm.

6. A battery explosion-proof valve protection structure according to claim 5, characterized in that: The thickness of the first substrate layer (1) and the second substrate layer (3) is 0.05 mm.

7. A battery explosion-proof valve protection structure according to claim 6, characterized in that: The thickness of the first adhesive layer (2) and the second adhesive layer (4) is 0.02-1 mm.

8. A battery explosion-proof valve protection structure according to claim 7, characterized in that: The thickness of the first adhesive layer (2) and the second adhesive layer (4) is 0.07 mm, and the total thickness of the battery explosion-proof valve protection structure does not exceed 3.2 mm.

9. A battery explosion-proof valve protection structure according to claim 8, characterized in that: The first substrate layer (1) and the second substrate layer (3) are both made of PET material.

10. A battery, characterized in that: A battery explosion-proof valve protection structure as claimed in any one of claims 1 to 9 is used; it includes a battery cover plate, the battery cover plate has an explosion-proof hole, and the battery explosion-proof valve protection structure is installed at the explosion-proof hole.

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