Cover plate assembly, shell and battery

Abstract

The utility model provides a cover plate assembly, a shell and a battery, the cover plate assembly comprises an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are provided with liquid injection ports which are communicated, the cover plate assembly is characterized by further comprising a sealing part which is used for immediately sealing the liquid injection ports when liquid injection is finished, and the sealing part comprises a sealing piece, an elastic piece and a fixing piece; one end of the elastic piece is connected with the sealing piece, the other end of the elastic piece is connected with the fixing piece, and the fixing piece is connected to the bottom of the lower cover plate. The sealing piece and the elastic piece are arranged at the bottom of the liquid injection port of the battery, so that the elastic piece automatically rebounds the sealing piece to the liquid injection port to seal the liquid injection port when the liquid injection needle is taken out after liquid injection is finished, the sealing nail is prevented from being inserted and pulled for multiple times in the battery manufacturing process, the risk that water and foreign matters enter the battery is reduced, and the battery quality is improved. And the production efficiency and the battery manufacturing safety are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium batteries, in particular to a battery cover plate, a shell and a battery. BACKGROUND

[0002] In the prior art, in order to facilitate the supplement of electrolyte in the lithium battery, a liquid injection port is arranged on the lithium battery cover plate, and the liquid injection port is usually sealed by interference fit of a rubber plug or screw tightening. The electrolyte in the battery cell usually needs to be injected in multiple times or some battery packs are configured to be replenishable, and the rubber plug used to close the liquid injection hole is usually complex to remove, especially the rubber plug needs to be assisted by a tool and is difficult to operate. At the same time, the repeated insertion and removal of the rubber plug may cause the battery interior to be in contact with air, and even cause foreign matter to enter the battery interior, which is not conducive to the safety of battery manufacturing. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the embodiments of the present application provide a battery cover plate which can automatically open and close the liquid injection port, aiming at solving the problem of the need to pull and insert the rubber plug for injecting the electrolyte in the prior art.

[0004] The embodiments of the present application provide a cover plate assembly, which comprises an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are provided with a liquid injection port in communication, and further comprises a sealing part for sealing the liquid injection port immediately after the injection is completed, the sealing part comprises a sealing element, an elastic element and a fixing element; one end of the elastic element is connected with the sealing element, the other end of the elastic element is connected with the fixing element, and the fixing element is connected to the bottom of the lower cover plate.

[0005] In a specific embodiment, a plug is arranged in the middle of the sealing element, the plug has the same diameter as the liquid injection port, and is used to plug the liquid injection port; a sealing ring is arranged at the bottom of the plug, the diameter of the sealing ring is larger than that of the plug, and the sealing ring is used to further seal the liquid injection port.

[0006] In a specific embodiment, the elastic element is a compression spring, one end of the compression spring is connected with the sealing element, and the other end of the compression spring is connected with the fixing element.

[0007] In a specific embodiment, the compression spring is connected with the sealing element through a connecting element, the bottom of the sealing element is sleeved on the upper end of the connecting element, and the lower end of the connecting element is connected with the compression spring.

[0008] In a specific embodiment, the fixing element is an insulating hollow support, the insulating hollow support comprises a support leg and a support table connected with the support leg, the support leg is connected with the lower cover plate, and the support table is connected with the compression spring.

[0009] In an embodiment, the elastic member is a spring.

[0010] In an embodiment, one end of the spring is fixedly connected to the bottom of the lower cover plate, and the other end is connected to the sealing ring.

[0011] The application also provides a shell, which comprises a shell body and the cover plate assembly, the shell body forms an open end, the shell body is used for accommodating a core package and common electrolyte, and the cover plate assembly is arranged at the open end and the liquid injection port is in communication with the inside of the shell body.

[0012] The application also provides a battery, which comprises an electric core and the shell.

[0013] The cover plate assembly provided by the application can push the sealing member upward by the elastic force of the elastic member when the liquid injection needle is removed after liquid injection is completed, so that the sealing member is automatically pushed back to the liquid injection port, the liquid injection port is sealed, the sealing needle is not plugged and unplugged multiple times in the battery manufacturing process, the risk of moisture and foreign matter entering the battery is reduced, the production efficiency and the safety of battery manufacturing are improved, and the production cost can be effectively saved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 A structural schematic diagram of a sealing state cover plate assembly provided by an embodiment of the application;

[0016] Figure 2 A partial enlarged structural schematic diagram of Figure 1

[0017] Figure 3 A structural schematic diagram of a liquid injection state cover plate assembly provided by an embodiment of the application;

[0018] Figure 4 A partial enlarged structural schematic diagram of Figure 3

[0019] Figure 5 An exploded structural schematic diagram of a shell provided by an embodiment of the application.

[0020] ​​10, upper cover plate; 20, lower cover plate; 100, liquid injection port; 301, plug; 400a, compression spring; 601, support leg; 602, support table; 40, shell body; 30, liquid injection needle. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0022] It should be understood that, in the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, be operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0023] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "connection" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0024] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact, or contact through an intermediate medium layer, which can be contact between two things that are in contact without interaction force, or contact between two things that are in contact with interaction force.

[0025] In addition, in the embodiments of the present application, the words "exemplarily" or "for example" and the like are used to represent as an example, illustration or explanation, and any embodiment or design scheme described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplarily" or "for example" and the like are intended to present the relevant concept in a specific way.

[0026] The present application will be described in detail below.

[0027] Reference Figures 1-4The embodiment of the present application provides a cover plate assembly, the cover plate assembly comprises an upper cover plate 10 and a lower cover plate 20, the upper cover plate 10 and the lower cover plate 20 are provided with a liquid injection opening 100 in communication, and the cover plate assembly further comprises a sealing part for sealing the liquid injection opening 100 immediately after liquid injection is completed, the sealing part comprises a sealing element, an elastic element and a fixing element, one end of the elastic element is connected with the sealing element, the other end of the elastic element is connected with the fixing element, and the fixing element is connected to the bottom of the lower cover plate 20.

[0028] In an embodiment, the compression spring 400a is abutted with the sealing element through a connecting piece, the bottom of the sealing element is sleeved on the upper end of the connecting piece, the lower end of the connecting piece is connected with the compression spring 400a, and the connecting piece can play a buffering protection role when the compression spring 400a rebounds, so that the compression spring 400a can keep good elasticity, and meanwhile, the connecting piece is a central symmetrical circle, so that the compression spring 400a is more uniformly stressed when the compression spring 400a is elastically deformed.

[0029] In an embodiment, the insulating hollow support comprises a support leg 601 and a support table 602 connected with the support leg 601, the support leg 601 is connected with the lower cover plate 20, and the support table 602 is connected with the compression spring 400a, so that the insulating hollow support can limit the compression degree and rebound degree of the compression spring 400a, the compression spring 400a can be effectively prevented from being excessively deformed, and the service life of the compression spring 400a is guaranteed.

[0030] Specifically, referring to Figures 1 to 5 , the middle of the sealing element is provided with a plug 301, the plug 301 is the same in diameter with the liquid injection opening 100, and is used for plugging the liquid injection opening 100; in a liquid injection state, the injection needle 30 is inserted into the liquid injection opening 100 to extrude and push the plug 301, the plug 301 generates downward pressure on the compression spring 400a, the compression spring 400a is retracted, the plug 301 deviates from the liquid injection opening 100, so that the liquid injection opening 100 is opened, and the injection needle 30 is convenient to inject electrolyte into the inside of the shell body 40. When the liquid injection is completed, the injection needle 30 is separated, the compression spring 400a rebounds upward under the action of elasticity, the plug 301 is bounced back to the liquid injection opening 100, so that the liquid injection opening 100 is closed, and automatic sealing of the liquid injection opening 100 is realized. The risk of the battery entering moisture and foreign matters is reduced, the production efficiency and the safety of battery manufacturing are improved, and the production cost can be effectively saved.

[0031] In addition, referring to Figure 5 , the embodiment of the present application further provides a shell, which comprises a shell body 40 and the above-mentioned cover plate assembly, the shell body 40 forms an open end, the shell body 40 is used for containing a core package and commonly used electrolyte, and the cover plate assembly is arranged at the open end and the liquid injection opening is in communication with the inside of the shell body 40.

[0032] The application further provides a battery, comprising a battery cell and the shell.

[0033] In an embodiment, a plug 301 is arranged in the middle of the sealing member, the plug 301 has the same diameter as the liquid injection port 100, and is used to block the liquid injection port 100 in a non-liquid injection state; the bottom of the plug 301 is provided with a sealing ring, the sealing ring has a diameter larger than that of the plug 301, and the sealing ring further forms airtight contact with the bottom surface of the lower cover plate 20; in the case that the sealing degree of the plug 301 is incomplete, the sealing ring can also seal the liquid injection port 100, thereby improving the sealing effect.

[0034] In some embodiments of the application, the elastic member is a spring 400b, one end of the spring 400b is fixedly connected to the bottom of the lower cover plate 20, and the other end is connected to the sealing ring 302.

[0035] Specifically, in the liquid injection state, the liquid injection needle 30 is inserted into the liquid injection port 100 to press and push the plug 301, so that the sealing ring fixedly connected to the plug 301 generates a downward pressure on the spring, the spring is pressed downward to drive the plug 301 to move away from the liquid injection port 100, thereby opening the liquid injection port 100, and facilitating the liquid injection needle 30 to inject electrolyte into the inside of the shell body 20. When the liquid injection is completed, the liquid injection needle 30 is pulled away, and the spring rebounds upward under the action of elasticity to pop the plug 301 back to the liquid injection port 100, thereby closing the liquid injection port 100, and realizing automatic sealing of the liquid injection port 100. This avoids multiple insertion and extraction of the sealing pin in the battery manufacturing process, reduces the risk of water and foreign matter entering the battery, improves the production efficiency and the safety of battery manufacturing, and effectively saves the production cost.

[0036] In addition, the application further provides a shell, comprising a shell body 40 and the above-mentioned cover plate assembly, the shell body 40 forms an open end, the shell body 40 is used to accommodate a cell package and commonly used electrolyte, and the cover plate assembly is arranged at the open end and the liquid injection port is in communication with the inside of the shell body 40.

[0037] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the application, and these modifications or replacements should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A cover assembly comprising an upper cover plate and a lower cover plate, the upper and lower cover plates being provided with liquid injection ports in communication with each other, characterized in that, Also include a sealing part for sealing the liquid injection port immediately at the end of liquid injection, the sealing part includes a sealing element, a resilient element and a fixing element; one end of the resilient element is connected with the sealing element, the other end of the resilient element is connected with the fixing element, and the fixing element is connected at the bottom of the lower cover plate; The middle of the sealing element is provided with a plug, the diameter of the plug is the same as that of the liquid injection port, and the plug is used for plugging the liquid injection port; the bottom of the plug is provided with a sealing ring, and the diameter of the sealing ring is greater than that of the plug, so as to further seal the liquid injection port; The resilient element is a compression spring, the compression spring is abutted with the sealing element through a connecting element, the bottom of the sealing element is sleeved on the upper end of the connecting element, the lower end of the connecting element is connected with the compression spring, and the connecting element can play a buffering protection role when the compression spring rebounds, and the connecting element is a central symmetric circle, so that the compression spring is more uniform in stress when it is elastically deformed; The fixing element is an insulating hollow support, the insulating hollow support includes a supporting leg and a supporting table connected with the supporting leg, the supporting leg is connected with the lower cover plate, and the supporting table is connected with the compression spring, the insulating hollow support limits the compression of the compression spring and the rebound degree, and prevents the compression spring from being deformed excessively.

2. A housing characterized by, The shell includes a shell body and the cover plate assembly of claim 1, the shell body forms an open end, the shell body is used for accommodating a core package and common electrolyte, and the cover plate assembly is arranged at the open end and the liquid injection port is in communication with the inside of the shell body.

3. A battery, characterized by The battery includes a core and the shell of claim 2, and the core is arranged in the shell body.

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