Battery cover plate and battery

Abstract

The utility model provides a battery cover plate which comprises a plate body provided with a liquid injection hole; a cavity is formed in the middle of the sealing nail, an air hole communicated with the cavity is formed in the bottom of the sealing nail, the sealing nail is at least partially inserted into the liquid injection hole to seal the liquid injection hole, and gas in the battery can enter the cavity from the air hole; and one surface of the sealing cover is provided with a puncturing piece, and the sealing cover is welded with the plate body so as to seal the sealing nail. According to the battery cover plate disclosed by the utility model, the liquid injection hole is sealed by using the sealing nail with the air hole and the sealing cover with the puncturing piece, so that after the sealing cover is welded, the sealing cover can be pressed to enable the puncturing piece to puncture the sealing nail so as to be communicated with the interior of the liquid injection hole, and at the moment, test gas is diffused outwards from the interior of a battery to the sealing cover; if the welding position of the sealing cover is not tight enough, the test gas can be detected, so that the sealing performance of the welding position of the sealing cover is confirmed, and the situation that the test gas cannot be diffused due to the fact that the liquid injection hole is blocked by the sealing nail is avoided. The utility model further discloses a battery which comprises a shell, a battery cell and the battery cover plate.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a battery cover and a battery. Background Art

[0002] With the rapid development of smart electronic products, the demand for lithium batteries is increasing, and the quality requirements for lithium batteries are also getting higher and higher. In the production process of lithium-ion batteries, since electrolytes need to be injected during the manufacture of lithium batteries, an injection hole is left on the shell of the lithium battery. After the injection is completed, a sealing nail is usually used to seal the injection hole, and a sealing cover is welded on top of it for further sealing.

[0003] In order to ensure the sealing of the welding point between the sealing cover and the battery cell casing, a special gas is usually used to test the welding sealing effect: a certain amount of test gas is introduced into the injection hole, and after the sealing cover welds and seals the injection hole, the sealing effect is determined by whether the test gas can be detected.

[0004] However, since the sealing nail itself has sealing properties and a certain sealing effect on the liquid injection hole, the test gas inside the battery cell cannot leak from the inside of the battery cell. Even if there is an abnormality in the welding of the sealing cover, the test gas cannot be detected, which shortens the life of this part of the battery and poses a greater safety hazard. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery cover plate, aiming to solve the problem that it is impossible to accurately detect whether the sealing cover welding is abnormal.

[0006] In order to achieve the above object, the utility model provides a battery cover, which includes:

[0007] A plate body, wherein a liquid injection hole is provided on the plate body;

[0008] A sealing nail, wherein the middle of the sealing nail is a cavity, and an air hole communicating with the cavity is provided at the bottom of the sealing nail, and the sealing nail is at least partially inserted into the injection hole to close the injection hole, and the gas inside the battery can enter the cavity through the air hole;

[0009] A sealing cover, one side of which is provided with a piercing member, and the sealing cover is welded to the plate body to seal the sealing nail.

[0010] In some embodiments, a sink is configured at the upper end of the injection hole, the position of the sealing cover corresponding to the sink is an elastic portion, and the piercing member is disposed on the elastic portion.

[0011] In some embodiments, the elastic portion is arranged in an arc shape.

[0012] In some embodiments, the sealing pin includes a sealing cap and a sealing body which are vertically arranged to each other, the sealing body is inserted into the injection hole, and the sealing cap abuts against the bottom of the sink.

[0013] In some embodiments, the portion of the sealing cap corresponding to the piercing member is constructed as a sealing film, and the sealing film is any one of a plastic film, a plastic film, a silicone film, and a rubber film.

[0014] In some embodiments, the sealing body and the injection hole are interference fit.

[0015] In some embodiments, the length of the piercing member is less than or equal to the distance between the farthest end of the elastic portion and the sealing cap.

[0016] In some embodiments, the upper end of the sink platform is configured with an end surface, the sealing cover is welded to the end surface, and the thickness of the sealing cover is equal to the depth of the end surface.

[0017] In some embodiments, the end of the piercing member facing away from the sealing cover is configured to be thorn-shaped.

[0018] The utility model further provides a battery, comprising a housing, a battery cell and the battery cover plate described in any one of the above embodiments.

[0019] The utility model discloses a battery cover plate, which seals a liquid injection hole by using a sealing nail with an air hole and a sealing cover with a puncture piece, so that after the sealing cover is welded, the sealing cover can be pressed to make the puncture piece puncture the sealing nail to connect to the inside of the liquid injection hole, and at this time, the test gas diffuses from the inside of the battery to the sealing cover. If the welding part of the sealing cover is not tight enough, the test gas can be detected, thereby confirming the sealing performance of the welding part of the sealing cover, and avoiding the situation that the sealing nail blocks the liquid injection hole and the test gas cannot diffuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of an embodiment of a battery cover of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of an embodiment of a battery cover of the utility model when it is actually used;

[0022] Figure 3 This is a schematic diagram of the structure of the sealing nail in the battery cover of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the battery of the utility model.

[0024] Reference numerals:

[0025] 100, plate body; 110, injection hole; 120, sink; 130, end face; 200, sealing nail; 210, cavity; 220, air hole; 230, sealing cap; 231, sealing film; 240, sealing body; 300, sealing cover; 310, piercing member; 320, elastic part; 400, outer shell. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] During the battery production process, after the battery is filled with liquid, the battery needs to be sealed. Before sealing, a certain amount of helium or other test gas needs to be injected into the battery so that after the sealing is completed, the sealing of the battery can be tested by detecting whether there is gas leakage at the liquid filling port of the battery. The existing sealing method is to first fill the battery with helium, and then weld a sealing cover at the liquid filling hole to seal the liquid filling hole. The interference fit between the existing sealing nails and the liquid filling hole will cause the helium filled in the battery to be unable to leak out. Even if there is a problem in the process of welding the sealing cover, the problematic battery cannot be selected. The sealing nails of the problematic battery are prone to loosening during long-term transportation and use, causing battery leakage, which poses a great safety hazard. Based on this problem, an embodiment of the utility model proposes a battery cover plate, with reference to Figure 1-Figure 4 In a preferred embodiment, the battery cover comprises:

[0031] A plate body 100, wherein a liquid injection hole 110 is provided on the plate body 100;

[0032] The sealing nail 200 has a cavity 210 in the middle thereof, and a pore 220 communicating with the cavity 210 is provided at the bottom of the sealing nail 200. The sealing nail 200 is at least partially inserted into the injection hole 110 to close the injection hole 110, and the gas inside the battery can enter the cavity 210 through the pore 220;

[0033] The sealing cover 300 has a piercing member 310 on one side thereof, and the sealing cover 300 is welded to the plate body 100 to seal the sealing nail 200 .

[0034] In this embodiment, after the welding of the plate body 100 is completed, a certain amount of test gas and an appropriate amount of electrolyte are introduced through the injection hole 110, and then the injection hole 110 is sealed. When sealing, the sealing nail 200 is first fixed in the injection hole 110, and then the sealing cover 300 is covered on the sealing nail 200 and welded to the plate body 100. After the sealing is completed, the sealing cover 300 is pressed by the staff or the corresponding equipment, so that the piercing member 310 set on the sealing cover 300 pierces the top of the sealing nail 200, and the test gas inside the battery diffuses to the welding place of the sealing cover 300. By detecting whether the test gas is leaking, the welding effect of the sealing cover 300 can be judged.

[0035] In this embodiment, the plate body 100 is made of metal or alloy, which can be the same or different from the material of the battery housing 400. It is used to cover the battery cell to prevent the leakage of internal battery substances or external environmental substances from entering the battery, so as to maintain the stability of the internal environment of the battery, and at the same time can provide certain mechanical support and fixing effects. The shape of the plate body 100 can be various, including but not limited to any one of a circular plate body 100 and a polygonal plate body 100, wherein the circular plate body 100 includes but is not limited to a perfect circle and an ellipse, etc., and the polygonal plate body 100 includes but is not limited to a square, a rectangle or other polygons. An injection hole 110 is provided on the plate body 100, and the injection hole 110 can realize the injection of electrolyte in the battery, and the present application does not limit the number of injection holes 110, which can be set to two or more. The cross section of the injection hole 110 is usually circular, and the cross section of the injection hole 110 can also be a polygon or an ellipse.

[0036] The sealing cover 300 is welded to the plate body 100, and its material is usually the same as that of the plate body 100. The sealing cover 300 also has a variety of shapes, which will not be described here. A piercing member 310 is provided at the bottom of the sealing cover 300 to facilitate piercing the top of the sealing pin 200. It can be understood that the piercing member 310 and the sealing cover 300 can be integrally formed, or the piercing member 310 can be fixed to the sealing cover 300 by bonding, threading, welding, etc., and the utility model does not limit this.

[0037] The sealing nail 200 is usually made of rubber or silicone. The shape of the sealing nail 200 can be a cylindrical structure, a prismatic structure or other structures. It is only necessary to make the shape of the sealing nail 200 adapt to the shape of the injection hole 110. When the sealing nail 200 is inserted into the injection hole 110, the injection hole 110 can be sealed. The interior of the sealing nail 200 is a cavity 210, and the bottom is provided with an air hole 220, so that when the piercing member 310 pierces the top of the sealing nail 200, the sealing cover 300 and the inside of the battery cell are connected, so that the test gas can diffuse through the inside of the sealing nail 200 to the welding point of the sealing cover 300. It should be noted that the size of the air hole 220 is small, and only gas can pass through to prevent leakage of the electrolyte inside the battery.

[0038] The battery cover plate proposed by the utility model seals the injection hole 110 by using a sealing nail 200 with an air hole 220 and a sealing cover 300 with a piercing member 310, so that after the sealing cover 300 is welded, the sealing cover 300 can be pressed to make the piercing member 310 pierce the sealing nail 200 to connect to the inside of the injection hole 110. At this time, the test gas diffuses from the inside of the battery to the sealing cover 300. If the welding part of the sealing cover 300 is not tight enough, the test gas can be detected, thereby confirming the sealing of the welding part of the sealing cover 300 to prevent defective products from entering the market.

[0039] like Figure 1 and Figure 2 As shown, in some embodiments, a sink 120 is configured at the upper end of the injection hole 110, and the position of the sealing cover 300 corresponding to the sink 120 is an elastic part 320, and the piercing member 310 is arranged on the elastic part 320. The elastic part 320 is made of an elastic material, such as rubber, plastic, etc. Preferably, the shape of the elastic part 320 is the same as the shape of the sink 120 projected on the sealing cover 300. The piercing member 310 is arranged on the elastic part 320, so that the elastic part 320 is pressed conveniently to make the piercing member 310 pierce the sealing nail 200.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the elastic portion 320 is arranged in an arc shape. The arc-shaped elastic portion 320 makes pressing more convenient, and at the same time keeps the piercing member 310 away from the sealing pin 200 when not in use, so as to prevent the piercing member 310 from piercing the sealing pin 200 when welding the sealing cover 300, so as to prevent the test gas from leaking in advance.

[0041] like Figure 1-Figure 3 As shown, in some embodiments, the sealing nail 200 includes a sealing cap 230 and a sealing body 240 which are arranged perpendicular to each other, the sealing body 240 is inserted into the injection hole 110, and the sealing cap 230 abuts against the bottom of the sink 120. That is, the sealing nail 200 is arranged in a T-shape, wherein the vertical sealing body 240 is used to seal the injection hole 110, and the horizontal sealing cap 230 can prevent the sealing nail 200 from accidentally falling into the lithium battery, and enhance the sealing performance of the sealing nail 200 to the injection hole 110.

[0042] like Figure 1 and Figure 2 As shown, in some embodiments, the portion of the sealing cap 230 corresponding to the piercing member 310 is configured as a sealing film 231, and the sealing film 231 is any one of a plastic film, a plastic film, a silicone film, and a rubber film. It is usually a soft film with good sealing performance and a thin thickness, which is easy to be pierced.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, the sealing body 240 is interference fit with the injection hole 110. The size of the sealing body 240 is slightly larger than the inner diameter of the injection hole 110, so that when the sealing nail 200 is inserted into the injection hole 110, the sealing body 240 can be tightly fixed in the injection hole 110, which not only improves the sealing performance, but also prevents the sealing nail 200 from falling into the interior of the lithium battery.

[0044] like Figure 1 and Figure 2As shown, in some embodiments, the length of the piercing member 310 is less than or equal to the distance between the farthest end of the elastic portion 320 and the sealing cap 230. This prevents the piercing member 310 from directly piercing the sealing cap 230 before the sealing cap 300 is pressed.

[0045] like Figure 1 and Figure 2 As shown, in some embodiments, the end of the piercing member 310 that is away from the elastic portion 320 is configured as a spike, so that the piercing member 310 can pierce the sealing nail 200 .

[0046] like Figure 1 and Figure 2 As shown, in some embodiments, the upper end of the sink 120 is configured with an end surface 130, the sealing cover 300 is welded to the end surface 130, and the thickness of the sealing cover 300 is equal to the depth of the end surface 130. This improves the flatness of the overall structure of the lithium battery and facilitates the installation and use of the lithium battery.

[0047] Reference Figure 1-Figure 4 The utility model further proposes a battery including a housing 400, a battery cell and a battery cover. The specific structure of the battery cover refers to the above embodiment. Since the battery in this embodiment adopts all the technical solutions of all the above embodiments, it at least has all the technical effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the battery cell is arranged in a chamber surrounded by the housing 400 and the battery cover, and the connection method between the housing 400 and the battery cover can be selected according to needs, such as welding, bonding, etc.

[0048] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A battery cover, characterized in that: The battery cover includes: A plate body, wherein a liquid injection hole is provided on the plate body; A sealing nail, wherein the middle of the sealing nail is a cavity, and an air hole communicating with the cavity is provided at the bottom of the sealing nail, and the sealing nail is at least partially inserted into the injection hole to close the injection hole, and the gas inside the battery can enter the cavity through the air hole; A sealing cover, one side of which is provided with a piercing member, and the sealing cover is welded to the plate body to seal the sealing nail; The injection hole is configured with a sink, the position of the sealing cover corresponding to the sink is an elastic part, and the piercing member is arranged on the elastic part; The sealing nail comprises a sealing cap and a sealing body which are vertically arranged to each other. The sealing body is inserted into the liquid injection hole, and the sealing cap abuts against the bottom of the sink.

2. The battery cover according to claim 1, characterized in that: The elastic portion is arranged in an arc shape.

3. The battery cover according to claim 2, characterized in that: The portion of the sealing cap corresponding to the piercing member is constructed as a sealing film, and the sealing film is any one of a plastic film, a plastic film, a silicone film, and a rubber film.

4. The battery cover according to claim 3, characterized in that: The sealing body is interference fit with the liquid injection hole.

5. The battery cover according to claim 4, characterized in that: The length of the piercing member is less than or equal to the distance between the farthest end of the elastic portion and the sealing cap.

6. The battery cover according to claim 1, characterized in that: The upper end of the sinking platform is configured with an end surface, the sealing cover is welded to the end surface, and the thickness of the sealing cover is equal to the depth of the end surface.

7. The battery cover according to any one of claims 1 to 6, characterized in that: The end of the piercing element facing away from the sealing cap is configured in a spike shape.

8. A battery, characterized in that: The invention comprises a housing, a battery cell and a battery cover as described in any one of claims 1 to 7.

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