Battery and gasket therefor

Abstract

The application discloses a battery and a gasket thereof. The gasket comprises a body which is a sheet-shaped insulating piece, the body is provided with a first channel and a second channel, one end of the first channel is arranged on one side of the body in the thickness direction of the body, the other end of the first channel extends towards the direction of the inside of the body, the radial dimension of the first channel gradually increases along the direction from the one end of the first channel to the other end of the first channel, one end of the second channel is arranged on the other side of the body in the thickness direction of the body, the other end of the second channel extends towards the direction of the inside of the body and communicates with the first channel. The gasket for the battery is not only beneficial to realizing that the pole core is soaked in the electrolyte, but also can reduce the probability that the material of the pole core is in contact with the shell of the battery when the material of the pole core falls off, and improves the safety performance of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery and a gasket thereof. Background Technology

[0002] With the growing global demand for clean energy and sustainable transportation solutions, secondary batteries, as a key energy storage medium, are increasingly being used in new energy vehicles (NEVs) and energy storage systems (ESS). The development of secondary battery technology has not only driven improvements in the driving range and performance of electric vehicles but also provided strong support for smart grids and the stable supply of renewable energy. However, with the expansion of application areas, the safety requirements for secondary batteries are becoming increasingly stringent.

[0003] Square batteries are increasingly used in new energy vehicles and energy storage systems. However, the battery core inevitably sheds material, which deposits at the bottom of the battery along with the electrolyte. This shed material corrodes the battery's bottom casing, posing a significant threat to battery safety and lifespan. Therefore, reducing core shedding and its impact on the battery's bottom casing is crucial. Utility Model Content

[0004] One objective of this application is to provide a pad for batteries that can at least solve the technical problem in the prior art where core material loss corrodes the bottom casing of the battery.

[0005] Another object of this application is to provide a battery including the aforementioned pad for the battery.

[0006] To achieve the above objectives, this application provides the following technical solutions.

[0007] A gasket for a battery according to a first aspect embodiment of this application includes: a body, the body being a sheet-like insulating member, the body having a first channel and a second channel; wherein, one end of the first channel is disposed on one side of the body in its own thickness direction, the other end of the first channel extends toward the interior of the body, and the radial dimension of the first channel gradually increases along the direction from one end of the first channel to the other end of the first channel; one end of the second channel is disposed on another side of the body in its own thickness direction, the other end of the second channel extends toward the interior of the body and communicates with the first channel.

[0008] Optionally, the area at the other end of the first channel is larger than the area at the other end of the second channel.

[0009] Optionally, the first channel and / or the second channel are frustoconical through holes. When the first channel is a frustoconical through hole, the area of ​​the other end of the first channel is greater than the area of ​​one end of the first channel; when the second channel is a frustoconical through hole, the area of ​​the other end of the second channel is smaller than the area of ​​one end of the second channel.

[0010] Optionally, the first channel and the second channel are frustum-shaped through holes, with the radius of one end of the first channel being R2 and the radius of one end of the second channel being R1, satisfying R2=0.2-0.5R1.

[0011] Optionally, there may be multiple first channels and / or second channels, and they may correspond one-to-one.

[0012] Optionally, the first channel and / or the second channel extend along the thickness direction of the body.

[0013] Optionally, the body further includes a third channel located inside the body. The inner wall of the third channel includes a first inner wall and a second inner wall disposed opposite to each other. The first inner wall has the other end of the first channel disposed on it, and the area of ​​the first inner wall is not less than the area of ​​the other end of the first channel. The second inner wall has the other end of the second channel disposed on it, and the area of ​​the second inner wall is greater than the area of ​​the other end of the second channel.

[0014] Optionally, the third channel extends parallel to one side of the body.

[0015] Optionally, along the thickness direction of the body, the height of the third channel is h1, and the thickness of the body is h, where h1 = 0.1-0.4h.

[0016] A battery according to a second aspect of this application includes: a housing having a bottom wall and a side wall, the bottom wall and the side wall enclosing a receiving space; an electrode core installed within the receiving space; and a gasket according to any of the above, the gasket being installed in the receiving space and located between the inner side of the bottom wall and the electrode core.

[0017] Therefore, the pad for the battery according to the embodiments of this application includes a body, which is a sheet-like insulating member. The body is provided with a first channel and a second channel. One end of the first channel is smaller in size than the other parts of the first channel, which can reduce the direct contact of the electrode core with the bottom wall of the battery casing. Moreover, the second channel and the first channel are interconnected, which can achieve the bottom of the electrode core being wetted.

[0018] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0020] Figure 1 This is a schematic diagram of the structure of a gasket according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the longitudinal section of a gasket according to an embodiment of this application.

[0022] Attached icon number

[0023] Gasket 100;

[0024] Body 10; First channel 11; Second channel 12; Third channel 13; First inner wall 131; Second inner wall 132. Detailed Implementation

[0025] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting 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.

[0026] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The pad 100 for a battery according to an embodiment of this application is described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, the pad 100 for a battery according to an embodiment of this application includes: a body 10.

[0031] Specifically, the body 10 is a sheet-like insulating component, and the body 10 is provided with a first channel 11 and a second channel 12; wherein, one end of the first channel 11 is located on one side of the body 10 in the thickness direction, and the other end of the first channel 11 extends toward the interior of the body 10, and the radial dimension of the first channel 11 gradually increases along the direction from one end of the first channel 11 to the other end of the first channel 11; one end of the second channel 12 is located on another side of the body 10 in the thickness direction, and the other end of the second channel 12 extends toward the interior of the body 10 and communicates with the first channel 11.

[0032] In other words, the pad 100 for the battery in this embodiment includes a body 10, which is a sheet-like insulating material. The body 10 can be installed between the bottom wall of the battery casing and the bottom of the electrode core.

[0033] The body 10 is provided with a first channel 11 and a second channel 12 that are interconnected. One end of the first channel 11 is located on one side surface of the body 10 in the thickness direction, and the second channel 12 is located on the other side surface of the body 10 in the thickness direction. When the gasket 100 is applied to the battery, one side surface of the body 10 can be opposite to the electrode core, and the other side surface of the body 10 can be opposite to the bottom wall of the casing.

[0034] On the one hand, along the axial extension direction of the first channel 11, the size of one end of the first channel 11 is smaller, and the internal size of the first channel 11 is larger. Specifically, along the direction from one end of the first channel 11 to the other end of the first channel 11, the radial size of the first channel 11 gradually increases. This not only reduces the probability of electrode core falling directly contacting the bottom wall of the battery casing, reducing the impact of electrode core falling on the battery casing, thereby extending the battery's service life, but also facilitates the entry of electrolyte into the first channel 11 from the other end of the first channel 11.

[0035] On the other hand, a second channel 12 is provided on the other side surface of the body 10 in the thickness direction. The second channel 12 and the first channel 11 are interconnected. Electrolyte can be stored in the first channel 11 and the second channel 12. Electrolyte located above the bottom wall of the shell can enter the second channel 12 through one end of the second channel 12, then enter the first channel 11, and flow out from one end of the first channel 11, so that the bottom of the electrode core can be wetted.

[0036] Therefore, the pad 100 for the battery according to the embodiment of this application includes a body 10, the body 10 is a sheet-like insulating member, the body 10 is provided with a first channel 11 and a second channel 12, one end of the first channel 11 is smaller in size than the other part of the first channel 11, which can reduce the direct contact of the electrode core with the bottom wall of the battery casing, and the second channel 12 and the first channel 11 are interconnected, which can realize that the bottom of the electrode core is wetted.

[0037] Alternatively, the gasket 100 can be made of conventional insulating soft materials, such as rubber, which can reduce costs.

[0038] Optionally, the pad 100 is a sheet-like structure, and the size and shape of the pad 100 can be designed according to the size of the battery casing and the bottom area of ​​the electrode core, which provides design flexibility.

[0039] Optionally, the area of ​​the gasket 100 can be slightly smaller than the bottom area of ​​the bottom wall of the housing, but larger than the bottom area of ​​the core, in order to better protect the housing from corrosion caused by material shedding.

[0040] In some specific embodiments of this application, the area at the other end of the first channel 11 is larger than the area at the other end of the second channel 12, which can further reduce the probability of dropping particles falling into the bottom of the shell.

[0041] According to one embodiment of this application, the first channel 11 is a frustum-shaped through hole, and the area of ​​the other end of the first channel 11 is larger than the area of ​​one end of the first channel 11. This not only effectively prevents the electrode core from falling into one end of the first channel 11, but also facilitates the electrolyte in the first channel 11 to enter the first channel 11 from the other end of the first channel 11. Moreover, the frustum-shaped through hole has the advantage of being easy to open.

[0042] In some specific embodiments of this application, the second channel 12 is a frustum-shaped through hole, and the area of ​​the other end of the second channel 12 is smaller than the area of ​​one end of the second channel 12, which facilitates the electrolyte to enter the second channel 12 from one end of the second channel 12 and facilitates the opening of the frustum-shaped through hole.

[0043] Understandably, the first channel 11 and / or the second channel 12 can be frustum-shaped through holes according to design requirements. For example, the body 10 extends horizontally, with one side of the body 10 being the upper surface and the other side being the lower surface. The first channel 11 and the second channel extend vertically, respectively, and are both holes that are narrow at the top and wide at the bottom. The design of being narrow at the top can effectively prevent particles from entering the hole, and the design of being wide at the bottom can avoid affecting the flow of the liquid and maintain good fluidity of the electrolyte.

[0044] In some specific embodiments of this application, the first channel 11 and the second channel 12 are frustum-shaped through holes, with the radius of one end of the first channel 11 being R2 and the radius of one end of the second channel 12 being R1, satisfying R2=0.2-0.5R1. For example, if the body 10 extends horizontally, and the first channel 11 and the second channel extend vertically respectively, both being holes that are narrower at the top and wider at the bottom, with the radius of the upper end of the first channel 11 being R2 and the radius of the lower end of the second channel 12 being R1, satisfying R2=0.2-0.5R1.

[0045] In this embodiment, by limiting the radius of one end of the first channel 11 to R2 and the radius of one end of the second channel 12 to R1, satisfying R2=0.2-0.5R1, not only can the bottom of the electrode core be fully wetted, but the direct contact of electrode core material with the battery casing can also be reduced, thus reducing the impact of electrode core material on the battery casing.

[0046] According to one embodiment of this application, the number of first channels 11 and / or second channels 12 is multiple, which can further improve the wetting effect at the bottom of the electrode core.

[0047] In some specific embodiments of this application, there are multiple first channels 11 and second channels 12, which correspond one-to-one, to facilitate the opening of first channels 11 and second channels 12, and to facilitate the flow of electrolyte.

[0048] According to one embodiment of this application, the first channel 11 and / or the second channel 12 extend along the thickness direction of the body 10 to facilitate the opening of the first channel 11 and the second channel 12, and to facilitate the flow of electrolyte.

[0049] In some specific embodiments of this application, the body 10 is further provided with a third channel 13, which is located inside the body 10. The inner wall of the third channel 13 includes a first inner wall 131 and a second inner wall 132 disposed opposite to each other. The other end of the first channel 11 is provided on the first inner wall 131, and the area of ​​the first inner wall 131 is not less than the area of ​​the other end of the first channel 11. The other end of the second channel 12 is provided on the second inner wall 132, and the area of ​​the second inner wall 132 is greater than the area of ​​the other end of the second channel 12.

[0050] In other words, a third channel 13 is formed inside the body 10, i.e., a cavity is formed inside the body 10. The third channel 13 is connected to the first channel 11 and the second channel 12. Specifically, the inner wall of the third channel 13 includes a first inner wall 131 and a second inner wall 132 arranged opposite to each other. For example, the first inner wall 131 and the second inner wall 132 are spaced apart in the vertical direction and extend horizontally. The lower end of the first channel 11 is located on the first inner wall 131, and the upper end of the second channel 12 is located on the second inner wall 132. Since the area of ​​the first inner wall 131 is not less than the area of ​​the other end of the first channel 11, it can prevent the electrolyte in the third channel 13 from entering the first channel 11. Moreover, even if the electrode core falls into the first channel 11, it can still enter the third channel 13. Furthermore, since the area of ​​the second inner wall 132 is larger than the area of ​​the other end of the second channel 12, even if the electrode core falls into the third channel 13, it can be buffered within the third channel 13, further reducing the probability of the fallen particles falling into the bottom of the shell and further preventing the electrode core from contacting the shell. In addition, the third channel 13 can increase the electrolyte storage capacity.

[0051] According to one embodiment of this application, the extension direction of the third channel 13 is parallel to one side of the body 10. For example, the body 10 extends in a horizontal direction, and the third channel 13 can extend in a left-right direction or in a front-back direction, etc., which facilitates the opening of the third channel 13 and also facilitates the setting of the first channel 11 and the second channel 12 connected to the third channel 13. At the same time, it can improve the uniformity of the bottom wetting effect of the electrode core.

[0052] In some specific embodiments of this application, along the thickness direction of the body 10, the height of the third channel 13 is h1, and the thickness of the body 10 is h, where h1 = 0.1-0.4h. That is, the radial width of the third channel 13 is h1, and the thickness of the body 10 is h, satisfying h1 = 0.1-0.4h, which not only ensures sufficient support strength and electrolyte storage capacity, but also allows the third channel 13 to serve as a secondary buffer station for dropped particles, greatly reducing the probability of particles falling into the bottom of the shell.

[0053] This application also discloses a battery, including: a casing, an electrode core, and a gasket 100. The casing has a bottom wall and a side wall, which enclose a receiving space. The electrode core is installed in the receiving space. The gasket 100 is installed in the receiving space and is located between the inner side of the bottom wall and the electrode core.

[0054] For example, a secondary battery includes a casing, a top cover, an electrode core, and a gasket 100. The casing is a semi-enclosed aluminum casing, with the top cover designed on top of the aluminum casing. The aluminum casing has an internal cavity, and the electrode core is designed inside the cavity of the aluminum casing. The top cover is designed with positive and negative terminals, an explosion-proof valve, and a liquid filling port. The electrode core is formed by winding or stacking positive electrode sheets, a separator, and negative electrode sheets. Positive and negative electrode tabs are designed on the upper part of the electrode core. The positive electrode tab is connected to the positive terminal on the top cover, and the negative electrode tab is connected to the negative terminal on the top cover. They can be connected by an adapter or directly. The outer layer of the electrode core is wrapped with a protective film, and a gasket 100 is provided on the bottom outer side, that is, the gasket 100 is located at the bottom of the electrode core and inside the casing.

[0055] According to an embodiment of this application, a pad 100 for a battery includes a body 10, which is a sheet-like insulating member. The body 10 is provided with a first channel 11 and a second channel 12, which can reduce the direct contact between the electrode core and the battery casing while wetting the bottom of the electrode core, reduce the impact of the electrode core on the battery casing, improve the service life of the battery casing, improve the safety performance of the battery, and improve the cycle life of the battery.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A pad (100) for a battery, characterized in that, include: The body (10) is a sheet-like insulating component, and the body (10) is provided with a first channel (11) and a second channel (12). Wherein, one end of the first channel (11) is located on one side of the body (10) in its thickness direction, and the other end of the first channel (11) extends toward the interior of the body (10). Along the direction from one end of the first channel (11) to the other end of the first channel (11), the radial dimension of the first channel (11) gradually increases. One end of the second channel (12) is located on the other side of the body (10) in the direction of its own thickness, and the other end of the second channel (12) extends toward the interior of the body (10) and communicates with the first channel (11).

2. The pad (100) for a battery according to claim 1, characterized in that, The area at the other end of the first channel (11) is greater than the area at the other end of the second channel (12).

3. The pad (100) for a battery according to claim 1, characterized in that, The first channel (11) and / or the second channel (12) are frustum-shaped through holes, When the first channel (11) is a frustum-shaped through hole, the area of ​​the other end of the first channel (11) is greater than the area of ​​one end of the first channel (11); When the second channel (12) is a frustum-shaped through hole, the area of ​​the other end of the second channel (12) is smaller than the area of ​​one end of the second channel (12).

4. The pad (100) for a battery according to claim 3, characterized in that, The first channel (11) and the second channel (12) are frustum-shaped through holes. The radius of one end of the first channel (11) is R2 and the radius of one end of the second channel (12) is R1, satisfying R2=0.2-0.5R1.

5. The pad (100) for a battery according to claim 1, characterized in that, The number of the first channel (11) and / or the second channel (12) is multiple and corresponds one-to-one.

6. The pad (100) for a battery according to claim 1, characterized in that, The first channel (11) and / or the second channel (12) extend along the thickness direction of the body (10).

7. The pad (100) for a battery according to any one of claims 1-6, characterized in that, The main body (10) is also provided with: The third channel (13) is located inside the body (10). The inner wall of the third channel (13) includes a first inner wall (131) and a second inner wall (132) arranged opposite to each other. The first inner wall (131) is provided with the other end of the first channel (11). The area of ​​the first inner wall (131) is not less than the area of ​​the other end of the first channel (11). The second inner wall (132) is provided with the other end of the second channel (12). The area of ​​the second inner wall (132) is greater than the area of ​​the other end of the second channel (12).

8. The pad (100) for a battery according to claim 7, characterized in that, The third channel (13) extends parallel to one side of the body (10).

9. The pad (100) for a battery according to claim 7, characterized in that, Along the thickness direction of the body (10), the height of the third channel (13) is h1, the thickness of the body (10) is h, and h1 = 0.1-0.4h.

10. A battery, characterized in that, include: A housing having a bottom wall and side walls, the bottom wall and side walls enclosing a receiving space; The electrode core is installed within the receiving space; The gasket (100) according to any one of claims 1-9 is mounted in the receiving space and located between the inner side of the bottom wall and the pole core.

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