Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery, and relates to the technical field of batteries. The cover plate assembly comprises a plate body, a boss and an anti-explosion valve. The plate body can be used for blocking the opening of the shell of the battery so as to achieve the purpose of protecting the electrode assembly in the shell. A pole of the battery can penetrate through the pole hole in the plate body, and the liquid injection hole in the plate body can be communicated with the accommodating cavity in the shell and is used for injecting electrolyte into the accommodating cavity. The boss is arranged on the plate body, the anti-explosion valve is arranged on the boss, and when the battery breaks down and exhausts gas, the gas can be exhausted out of the shell through the anti-explosion valve, so that the internal pressure of the battery is prevented from being too large. The boss is arranged on the plate body and protrudes out of the plate body, so that the structural strength of the boss is better than that of other parts of the plate body, the boss can still keep the structure stable without deformation when the pressure is increased due to the fact that gas is generated in the containing cavity of the shell, the anti-explosion valve is arranged on the boss, the anti-explosion valve can also keep the structure stable, and the risk of battery explosion is reduced.

Description

Technical Field

[0001] The present application relates to a cover plate assembly and a battery, belonging to the technical field of batteries. Background Art

[0002] With the promotion and application of new energy vehicles, the issue of lithium battery spontaneous combustion and vehicle safety has become a major concern. The design of the lithium-ion battery explosion-proof valve structure is crucial to battery safety. During use, the battery may produce a large amount of gas due to abnormalities, resulting in increased internal pressure. Therefore, it is necessary to install an explosion-proof valve on the battery cover to allow the gas to escape. Excessive gas pressure inside the battery will also cause significant pressure on the cover, which may cause deformation and lead to failure of the explosion-proof valve. Utility Model Content

[0003] The present application provides a cover plate assembly and a battery, which solves the problem of poor reliability of the explosion-proof valve of the battery in the related art.

[0004] In a first aspect, the present application provides a cover plate assembly, comprising:

[0005] The plate body is provided with a pole hole and a liquid injection hole;

[0006] A boss is provided on the plate body, the boss protruding from the surface of the plate body, and the cover plate assembly has an exhaust hole penetrating the boss and the plate body;

[0007] An explosion-proof valve is arranged at the exhaust hole.

[0008] In some embodiments, an inner groove is formed on a side of the plate body facing away from the boss, and the inner groove is opposite to the boss.

[0009] In some embodiments, the injection hole passes through the plate body and the boss.

[0010] In some embodiments, the circumferential edge of the boss is a curved surface.

[0011] In some embodiments, an explosion-proof membrane is further included, and the explosion-proof membrane is disposed on the boss and covers the explosion-proof valve.

[0012] In some embodiments, a mounting groove is provided on the boss, one end opening of the exhaust hole is provided on the bottom wall of the mounting groove, and the explosion-proof membrane is embedded in the mounting groove.

[0013] In some embodiments, at least a portion of the sidewall of the mounting groove is a curved surface.

[0014] In some embodiments, there are two pole holes, and the boss is located between the two pole holes.

[0015] On the second aspect, based on the above cover plate assembly, the present application also proposes a battery, including the above cover plate assembly.

[0016] In some embodiments, the battery further includes a shell, an electrode assembly and a pole, the shell is provided with a cavity and an opening connected to the cavity, the electrode assembly is arranged in the cavity, the plate body is sealed in the opening, the pole is passed through the pole hole and connected to the electrode assembly, and the injection hole, the explosion-proof valve and the cavity can be connected.

[0017] In the cover plate assembly provided in the present application, the plate body can be used to block the opening of the battery shell to achieve the purpose of protecting the electrode assembly in the shell. The pole hole on the plate body can be used for the battery pole to pass through, and the injection hole of the plate body can be connected to the cavity in the shell to inject electrolyte into the cavity. The boss is arranged on the plate body, and the explosion-proof valve is arranged on the boss. When the battery fails and exhausts, the gas can be discharged to the outside of the shell through the explosion-proof valve to prevent the internal pressure of the battery from being too high. The boss protrudes from the plate body, so that the structural strength of the boss is better than other parts of the plate body. In this way, when the pressure in the cavity of the shell increases due to the generation of gas, the boss can still maintain structural stability and not deform. The explosion-proof valve is arranged on the boss, so that the explosion-proof valve can also maintain structural stability. In this way, when the battery generates gas, the gas can be discharged smoothly through the explosion-proof valve, reducing the risk of battery explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the embodiments of the present application will become more readily understood through the following detailed description with reference to the accompanying drawings, in which various embodiments of the present application are illustrated by way of example and not limitation, wherein:

[0019] Figure 1 A schematic diagram of a cover plate assembly according to an embodiment of the present application;

[0020] Figure 2 A schematic diagram of an explosion-proof valve of a cover assembly according to an embodiment of the present application;

[0021] Figure 3 is a schematic cross-sectional view of a cover plate assembly according to an embodiment of the present application;

[0022] Figure 4 This is a schematic top view of the cover assembly according to an embodiment of the present application.

[0023] Reference numerals:

[0024] 100-plate body, 110-pole hole, 120-liquid injection hole, 130-inner groove,

[0025] 200- boss, 210- mounting groove,

[0026] 300-explosion-proof valve,

[0027] 400-explosion-proof film,

[0028] 500-pole. DETAILED DESCRIPTION

[0029] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0032] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0035] With the promotion and application of new energy vehicles, the issue of lithium battery spontaneous combustion and vehicle safety has become a major concern. The design of the lithium-ion battery explosion-proof valve structure is crucial to battery safety. During use, the battery may produce a large amount of gas due to abnormalities, resulting in increased internal pressure. Therefore, it is necessary to install an explosion-proof valve on the battery cover to allow the gas to escape. Excessive gas pressure inside the battery will also cause significant pressure on the cover, which may cause deformation and lead to failure of the explosion-proof valve.

[0036] In the cover plate assembly proposed in the present application, the plate body can be used to block the opening of the battery shell to achieve the purpose of protecting the electrode assembly in the shell. The pole hole on the plate body can be used for the battery pole to pass through, and the injection hole of the plate body can be connected to the cavity in the shell to inject electrolyte into the cavity. The boss is set on the plate body, and the explosion-proof valve is set on the boss. When the battery fails and exhausts, the gas can be discharged to the outside of the shell through the explosion-proof valve to prevent the internal pressure of the battery from being too high. The boss protrudes from the plate body, so that the structural strength of the boss is better than other parts of the plate body. In this way, when the pressure in the cavity of the shell increases due to the generation of gas, the boss can still maintain structural stability and not deform. The explosion-proof valve is set on the boss, so that the explosion-proof valve can also maintain structural stability. In this way, when the battery generates gas, the gas can be discharged smoothly through the explosion-proof valve, reducing the risk of battery explosion.

[0037] The cover assembly and battery provided in this application are described in detail below with reference to specific embodiments.

[0038] The present application embodiment proposes a battery, referring to Figures 1 to 4 As shown, the battery comprises a housing, an electrode assembly, a pole and a cover assembly. The battery can be used in electrical devices, and in particular, can be used as a power battery in automobiles.

[0039] The housing is the fundamental component of the battery of this application. It serves as a mounting base for at least some of the other components of the battery and protects at least some of the other components. The housing can be made of a metal material, which provides the housing with superior structural strength, thereby enhancing durability and reliability. Of course, the housing can also be made of a composite material, which allows the housing to be relatively lightweight while maintaining a certain level of structural strength.

[0040] The shell is provided with a cavity and an opening connected to the cavity, the opening is located on the surface of the shell, and the opening connects the cavity with the outside of the shell. The electrode assembly can be arranged in the cavity of the shell, and the electrolyte can also be injected into the cavity. The cover assembly can be arranged at the opening of the shell to block the opening, so that the electrode assembly and the electrolyte are blocked in the shell to protect the electrode assembly. Specifically, the cover assembly can be arranged to match the opening of the shell, and the cover assembly can be welded to the shell so that the cover assembly blocks the opening of the shell. The pole is passed through the cover assembly, so that one end of the pole protrudes from the cover assembly and is located outside the shell, and the other end of the pole can be extended into the cavity of the shell and connected to the pole ear of the electrode assembly, so that the electrode assembly can be electrically connected to the pole. The battery of the present application can be electrically connected to an external connector such as a busbar through the pole, so that the battery can be charged and discharged.

[0041] The cover assembly may also be provided with an injection hole 120 and an explosion-proof valve 300. The injection hole 120 is provided on the cover assembly and can communicate with the housing cavity. During battery preparation, electrolyte can be injected into the housing cavity through the injection hole 120. After the electrolyte injection is completed, the injection hole 120 can be sealed to prevent external impurities from entering the housing cavity. The cover assembly may also be provided with a vent hole that connects the housing cavity with the outside of the housing. The explosion-proof valve 300 is provided in the vent hole and can control the opening and closing of the vent hole. If an accident occurs in the battery and a large amount of gas is generated in the cavity, increasing the air pressure in the cavity, the explosion-proof valve 300 can open, and the gas in the cavity can be discharged to the outside of the housing through the explosion-proof valve 300, thereby preventing the battery from exploding due to excessive air pressure in the cavity.

[0042] In order to make the explosion-proof valve 300 structure of the cover plate assembly more stable and reliable, the embodiment of the present application further proposes a cover plate assembly, comprising a plate body 100, a boss 200 and an explosion-proof valve 300. The cover plate assembly can be applied to a battery.

[0043] The plate body 100 is the foundational component of the cover assembly of this application. It provides a mounting base for at least some of the other components of the cover assembly and serves to protect at least some of the other components. The plate body 100 can be made of a metal material, which provides it with superior structural strength, thereby enhancing its durability and reliability. Alternatively, the plate body 100 can be made of a composite material, allowing it to maintain a certain level of structural strength while remaining relatively lightweight.

[0044] The plate body 100 is provided with a terminal hole 110 and a liquid injection hole 120. When the cover plate assembly of the present application is used in a battery, the plate body 100 can be positioned at the opening of the battery casing. The battery terminal can be inserted into the terminal hole 110 of the plate body 100, so that one end of the terminal protrudes from the surface of the plate body 100. The terminal can be used to connect to an external connector such as a busbar. The liquid injection hole 120 of the plate body 100 can communicate with the housing cavity of the housing. After the battery components are assembled, electrolyte can be injected into the housing cavity through the liquid injection hole 120 of the plate body 100.

[0045] The boss 200 is provided on the plate body 100. The boss 200 is provided protruding from the surface of the plate body 100. Therefore, the structural strength of the portion of the plate body 100 corresponding to the boss 200 is relatively higher. When degassing occurs in the battery shell and the air pressure in the shell increases, the portion of the plate body 100 corresponding to the boss 200 has a higher structural strength. This can reduce the risk of deformation of the portion of the plate body 100 corresponding to the boss 200 due to the increased air pressure in the shell cavity, thereby allowing the portion of the plate body 100 corresponding to the boss 200 to maintain structural stability. The explosion-proof valve 300 is provided on the boss 200. Specifically, the cover plate assembly can also have an exhaust hole that passes through the boss 200 and the plate body 100, and the explosion-proof valve 300 can be provided at the exhaust hole. When the battery is in normal operation, the explosion-proof valve 300 is in a closed state, so that the cavity can be in a closed state. When gas is generated in the cavity and the air pressure in the cavity increases, the explosion-proof valve 300 can be in an open state. At this time, the gas in the cavity can be discharged to the outside of the shell through the valve port of the explosion-proof valve 300 to reduce the air pressure in the cavity, thereby achieving the purpose of pressure relief and avoiding the risk of explosion of the battery due to excessive internal pressure.

[0046] Because the portion of the plate 100 corresponding to the boss 200 has a relatively higher structural strength and is less susceptible to deformation by external forces, the explosion-proof valve 300 disposed within the vent hole can maintain structural stability, preventing damage to the explosion-proof valve 300. This allows the gas to be discharged smoothly through the explosion-proof valve 300 to the outside of the housing when the pressure in the housing cavity increases, thereby improving the safety and reliability of the battery during operation.

[0047] In some embodiments, the circumferential edge of the top of the boss 200 of the present application can be configured as a curved surface. This can prevent stress concentration on the boss 200 and provide the boss 200 with improved structural strength. Furthermore, the curved edge of the top of the boss 200 can also prevent sharp corners of the boss 200, thereby reducing the risk of accidents during assembly of the cover assembly.

[0048] In addition, in other embodiments, the edge of the top of the boss 200 of the present application can also be set as a planar chamfered structure, which can also avoid stress concentration in the boss 200, making the structural stability of the boss 200 better, and also avoid the edge of the boss 200 being a sharp structure.

[0049] In some embodiments, the plate body 100 of the present application is provided with an inner groove 130 on a side facing away from the boss 200, and the inner groove 130 is opposite to the boss 200. Specifically, in order to form the boss 200 on the plate body 100, the plate body 100 can be processed by a stamping process so that the plate body 100 is raised to form the boss 200. Correspondingly, the inner groove 130 can be formed on the side of the plate body 100 facing away from the boss 200. In this way, the boss 200 and the plate body 100 can be an integral structure, which improves the structural integrity of the cover plate assembly, and also makes the cover plate assembly of the present application require less material during preparation. The process of forming the boss 200 on the plate body 100 is relatively simpler, which can effectively reduce the preparation cost of the cover plate assembly of the present application.

[0050] In addition, the boss 200 is processed on the plate body 100 through a stamping process, so that the boss 200 is a reinforcing rib structure on the plate body 100. This ensures that the portion of the plate body 100 corresponding to the boss 200 has better structural strength, while also making the process of forming the boss 200 on the plate body 100 simpler, thereby reducing the preparation cost of the cover assembly.

[0051] In some embodiments, the injection hole 120 of the plate body 100 of the present application can also be set to pass through the boss 200 and the plate body 100. Accordingly, the injection hole 120 can be close to the exhaust hole on the plate body 100 and the boss 200. This can make the structure of the plate body 100 more compact, thereby making the structure of the battery of the present application relatively more compact. When preparing the cover plate assembly of the present application, the boss 200 can first be formed on the plate body 100 through a stamping process, and then the injection hole 120 and the exhaust hole can be opened on the boss 200, and finally the explosion-proof valve 300 can be installed in the exhaust hole. Since the injection hole 120 is set close to the exhaust hole, the boss 200 can be set relatively small accordingly. This can make the part of the plate body 100 affected by the stamping relatively small, so that the plate body 100 can maintain better structural strength.

[0052] In some embodiments, the cover assembly of the present application may also be provided with an explosion-proof membrane 400, wherein the explosion-proof membrane 400 is provided on the boss 200 and covers the explosion-proof valve 300. The explosion-proof membrane 400 can serve the purpose of protecting the explosion-proof valve 300. In the absence of an abnormal condition in which the internal air pressure of the battery is excessive, the explosion-proof membrane 400 can always cover the explosion-proof valve 300 to prevent the explosion-proof valve 300 from being exposed and damaged. The explosion-proof membrane 400 can be made of an aluminum membrane. The explosion-proof membrane 400 can be fixed to the boss 200 by welding and covers the explosion-proof valve 300. This can improve the reliability of the connection between the explosion-proof membrane 400 and the boss 200 and prevent the explosion-proof membrane 400 from easily falling off from the boss 200.

[0053] In some embodiments, to better secure the explosion-proof membrane 400 to the boss 200, a mounting groove 210 may be provided on the boss 200. One end of the vent opening may be located on the bottom wall of the mounting groove 210, and the explosion-proof membrane 400 may be embedded in the mounting groove 210. Specifically, the groove shape and dimensions of the mounting groove 210 may be configured to match the outer dimensions of the explosion-proof membrane 400, so that when the explosion-proof membrane 400 is embedded in the mounting groove 210, the outer wall of the explosion-proof membrane 400 abuts against the inner wall of the mounting groove 210. In this way, the mounting groove 210 can serve to limit the position of the explosion-proof membrane 400, allowing the explosion-proof membrane 400 to be better secured to the boss 200 to cover the explosion-proof valve 300.

[0054] In some embodiments, at least a portion of the inner wall of the mounting groove 210 on the boss 200 of the present application can be configured as a curved surface, and accordingly, at least a portion of the outer wall of the explosion-proof membrane 400 can also be configured as a curved outer wall corresponding to the curved inner wall of the mounting groove 210. This can improve the structural stability of the explosion-proof membrane 400. Specifically, the explosion-proof membrane 400 can be configured as a quasi-elliptical structure, and accordingly, the mounting groove 210 of the boss 200 can be configured as an elliptical groove.

[0055] In some embodiments, it should be understood that the battery has two terminals, one for positive and one for negative, serving as the battery's positive and negative poles, respectively. Accordingly, the plate 100 also has two terminal holes 110, with the two terminals passing through each of the two terminal holes 110. The two terminal holes 110 can be located on either side of the boss 200, such that the boss 200 is positioned between the two terminal holes 110.

[0056] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned implementation modes, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned implementation modes, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A cover plate assembly, characterized in that: include: The plate body (100) is provided with a pole hole (110) and a liquid injection hole (120); A boss (200) is provided on the plate body (100), the boss (200) protruding from the surface of the plate body (100), and the cover plate assembly has an exhaust hole penetrating the boss (200) and the plate body (100); An explosion-proof valve (300) is provided at the exhaust hole; The circumferential edge of the boss (200) is an arc surface.

2. The cover plate assembly according to claim 1, wherein: An inner groove (130) is provided on a side of the plate body (100) facing away from the boss (200), and the inner groove (130) is opposite to the boss (200).

3. The cover plate assembly according to claim 2, wherein: The liquid injection hole (120) passes through the plate body (100) and the boss (200).

4. The cover plate assembly according to any one of claims 1 to 3, characterized in that: It also includes an explosion-proof membrane (400), which is arranged on the boss (200) and covers the explosion-proof valve (300).

5. The cover plate assembly according to claim 4, wherein: A mounting groove (210) is provided on the boss (200), one end of the exhaust hole is opened on the bottom wall of the mounting groove (210), and the explosion-proof membrane (400) is embedded in the mounting groove (210).

6. The cover plate assembly according to claim 5, wherein: At least part of the side wall of the installation groove (210) is a curved surface.

7. The cover plate assembly according to claim 1, wherein: There are two pole holes (110), and the boss (200) is located between the two pole holes (110).

8. A battery, characterized in that: The invention comprises the cover plate assembly according to any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that The battery further comprises a shell, an electrode assembly and a pole, the shell is provided with a cavity and an opening communicating with the cavity, the electrode assembly is arranged in the cavity, the plate (100) is sealed in the opening, the pole is passed through the pole hole (110) and is connected to the electrode assembly, and the injection hole (120) and the explosion-proof valve (300) are communicable with the cavity.

Images