Cover plate assembly and button cell
The cover assembly for button batteries addresses the issue of leakage by arranging the protrusion towards the winding core, dispersing pressure, and reducing stress concentration to prevent pole separation and enhance insulation.
Patent Information
- Application Number
- CN202420124457.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-18
AI Technical Summary
Button batteries are prone to leakage due to the separation of the pole from the cover body under pressure, which is exacerbated by the overlapping connection structure of the positive and negative pole shells, leading to increased space occupation and reduced energy density.
A cover assembly comprising a cover plate, insulating member, and pole, where the protrusion is arranged towards the winding core, with the connecting plate's pressure surface facing away from the cover body, dispersing pressure and reducing stress concentration to prevent separation and leakage.
The design effectively prevents pole separation from the cover body, reduces deformation, and suppresses leakage by dispersing pressure, enhancing insulation and reducing the risk of short circuits.
Smart Images
Figure CN222168549U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of button batteries, and in particular to a cover assembly and a button battery. Background Art
[0002] Button cell, also known as button cell, refers to a battery that looks like a small button. Its shell is generally made of stainless steel. Compared with cylindrical cells, button cell is thinner. Button cell mainly includes shell and winding core. The shell includes positive electrode shell and negative electrode shell. The positive electrode shell and negative electrode shell together form a receiving cavity. The winding core is arranged in the receiving cavity. The positive electrode ear of the winding core is connected to the positive electrode shell, and the rolled negative electrode ear is connected to the negative electrode shell.
[0003] In the related art, for example, the button battery disclosed in publication number CN111403632A includes a first pole shell, a second pole shell, an insulating sealing ring and a battery cell. The first pole shell is hollow inside and open at one end, the second pole shell is hollow inside and open at one end, the open end of the second pole shell is inserted into the inner side of the open end of the first pole shell, the open ends of the first pole shell and the second pole shell at least partially overlap, the insulating sealing ring is arranged between the first pole shell and the second pole shell and electrically isolates the first pole shell from the second pole shell, the first pole shell includes a first bottom wall and a first side wall connected to the outer periphery of the first bottom wall, the first side wall supports the insulating sealing ring and the second pole shell in the axial direction, the first pole shell, the second pole shell and the insulating sealing ring form a sealed cavity, the battery cell is arranged in the cavity and the battery cell is electrically connected to the first pole shell and the second pole shell, respectively.
[0004] However, since the open end of the first pole shell at least partially overlaps with the open end of the second pole shell, that is, the open end of the positive pole shell at least partially overlaps with the open end of the negative pole shell, the connection structure of the button battery occupies a larger space, that is, the outer diameter of the button battery is larger, resulting in a lower energy density of the button battery.
[0005] In order to reduce the space occupied by the connection structure of the button battery, in the related art, for example, the button battery disclosed in the announcement number CN219286526U, the button battery includes a shell and a cover assembly, the shell and the cover assembly are respectively the first pole shell and the second pole shell, the shell is provided with a receiving groove, the side wall of the receiving groove is provided with a step portion, the step portion is arranged along the circumference of the opening of the receiving groove, the cover assembly includes a cover body, the periphery of the cover body overlaps the step portion, the shell and the cover body are fixedly connected by welding, so that the outer peripheral side of the cover assembly is accommodated in the receiving groove. In this way, the connection structure between the shell and the cover assembly is omitted, and the energy density of the button battery is improved.
[0006] However, the cover assembly also includes an insulating member and a pole. The cover body, the insulating member and the pole are stacked in sequence. The pole is provided with a protrusion, which is passed through the insulating member and the cover body. The cover body abuts against the step portion. The side with the largest surface area of the pole faces the cell assembly, that is, the side with the largest surface area of the pole faces the inside of the battery. The insulating member is bonded to the cover body and the pole, respectively. During the manufacturing process of button batteries, the clamp will apply pressure to the top of the button battery, that is, the clamp will apply pressure to the protrusion of the pole. When the clamp applies pressure to the protrusion, the pole has a tendency to separate from the cover body, causing the pole to be more easily separated from the cover body when under pressure, resulting in the problem of easier leakage of the button battery.
[0007] Therefore, there is an urgent need to solve the problem that button batteries are more likely to leak after being compressed at the top. Utility Model Content
[0008] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cover assembly and a button battery that can suppress leakage.
[0009] The purpose of this disclosure is achieved through the following technical solutions:
[0010] A cover plate assembly, comprising a cover plate body, an insulating member and a pole, wherein the periphery of the cover plate body is used to be connected to the opening of a shell, the cover plate body is provided with a clearance hole, the insulating member is provided with a clearance hole, the pole comprises a connecting plate and a protruding portion, the connecting plate, the insulating member and the cover plate body are sequentially bonded, the protruding portion is connected to one side of the connecting plate, the protruding portion is penetrated through the clearance hole and the avoiding hole, and the protruding portion is spaced apart from the cover plate body;
[0011] The cover plate body, the insulating member and the connecting plate are stacked in sequence in a direction away from the winding core, and the protrusion is used to be arranged toward the winding core.
[0012] In one embodiment, the insulating member completely covers one side of the cover body.
[0013] In one of the embodiments, the peripheral side surface of the connecting plate is flush with the peripheral side surface of the cover plate body.
[0014] In one of the embodiments, the insulating member is provided with a connecting groove, and the cover plate body is located in the connecting groove and bonded to the insulating member.
[0015] In one embodiment, the cover plate body is completely received in the connecting groove.
[0016] In one embodiment, the insulating member is an insulating composite adhesive layer, a silicone layer or a rubber layer.
[0017] In one of the embodiments, the cover plate assembly further includes an electrical isolator connected to a side of the cover plate assembly facing away from the connecting plate.
[0018] In one embodiment, the electrical isolation element is insulating tape.
[0019] In one of the embodiments, a side of the protrusion facing away from the connecting plate is flush with the electrical isolation member.
[0020] A button battery comprises the cover assembly described in any one of the above embodiments.
[0021] Compared with the prior art, the present invention has at least the following advantages:
[0022] 1. Since the raised portion is arranged toward the winding core, the side of the connecting plate away from the cover body is the pressure surface. When the clamp applies pressure on the pressure surface of the connecting plate, the cover body supports the insulating member and the connecting plate. The connecting plate has a tendency to approach the cover body, thereby avoiding the problem of the pole being separated from the cover body when under pressure, and suppressing the problem of leakage of the button battery after the top is under pressure.
[0023] 2. The pressure on the connecting plate is transmitted to the insulating part, the cover plate body and the shell in turn, dispersing the pressure of the clamp, reducing stress concentration, reducing the deformation of the button battery, and further suppressing the leakage problem of the button battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 A schematic structural diagram of a button battery according to an embodiment;
[0026] Figure 2 for Figure 1 An enlarged schematic diagram of a button cell at position A is shown;
[0027] Figure 3 for Figure 1 A schematic structural diagram of a cover assembly of a button cell shown;
[0028] Figure 4 for Figure 1 An exploded view of the cover assembly of the button cell is shown. DETAILED DESCRIPTION
[0029] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.
[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0032] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:
[0033] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:
[0034] like Figures 1 to 4As shown, a button battery 10 of an embodiment includes a housing 100, a winding core 200 and a cover assembly 300, wherein the winding core 200 is disposed in the housing 100, and the cover assembly 300 covers the housing 100. In one embodiment, the cover assembly 300 includes a cover body 310, an insulating member 320 and a pole 330, wherein the periphery of the cover body 310 is used to connect to the opening of the housing 100, the cover body 310 is provided with a clearance hole 311, and the insulating member 320 is provided with a clearance hole 3201. The pole 330 includes a connecting plate 331 and a protruding portion 332, wherein the connecting plate 331, the insulating member 320 and the cover body 310 are sequentially bonded, the protruding portion 332 is connected to one side of the connecting plate 331, the protruding portion 332 is penetrated through the clearance hole 3201 and the avoiding hole 311, and the protruding portion 332 is spaced apart from the cover body 310. The cover plate body 310, the insulating member 320 and the connecting plate 331 are stacked in sequence in a direction away from the winding core 200, the protrusion 332 is used to be arranged toward the winding core 200, and the side of the connecting plate 331 away from the insulating member 320 is an end face of the button battery 10. In this embodiment, when the cover plate assembly 300 is installed, the periphery of the cover plate body 310 is connected to the opening of the housing 100, so that the protrusion 332 is arranged toward the winding core 200, and the side of the connecting plate 331 away from the insulating member 320 is a pressure surface, which is used for electrical connection with the outside.
[0035] In the above-mentioned cover assembly 300, since the protrusion 332 is arranged toward the winding core 200, the side of the connecting plate 331 away from the cover body 310 is a pressure surface. When the clamp applies pressure to the pressure surface of the connecting plate 331, the cover body 310 supports the insulating member 320 and the connecting plate 331. The connecting plate 331 has a tendency to approach the cover body 310, which avoids the problem of the pole 330 being separated from the cover body 310 when under pressure, and suppresses the problem of button battery 10 leaking after the top is compressed. Moreover, the pressure on the connecting plate 331 is transmitted to the insulating member 320, the cover body 310 and the housing 100 in turn, dispersing the pressure of the clamp, reducing stress concentration, reducing the deformation of the button battery 10, and further suppressing the leakage of the button battery 10.
[0036] like Figure 3 As shown, in one embodiment, the insulating member 320 completely covers one side of the cover body 310, thereby avoiding the problem of contact between the connecting plate 331 and the cover body 310, and further avoiding the problem of short circuit caused by insulation failure of the insulating member 320.
[0037] like Figure 3 As shown, in one embodiment, the peripheral side surface of the connecting plate 331 is flush with the peripheral side surface of the cover body 310, and the upper end surface of the button battery 10 is of the same polarity, which reduces the probability of overlap between the positive and negative electrodes, thereby reducing the probability of short circuit.
[0038] like Figure 3 and Figure 4 As shown, in one embodiment, the insulating member 320 is provided with a connecting groove 3202, and the cover body 310 is located in the connecting groove 3202 and bonded to the insulating member 320, so that the insulating member 320 isolates the protrusion 332 from the cover body 310, avoiding the short circuit problem caused by the contact between the protrusion 332 and the cover assembly 300.
[0039] like Figure 3 As shown, in one embodiment, the cover body 310 is completely received in the connecting groove 3202 , thereby improving the insulation effect of the insulating member 320 .
[0040] In one embodiment, the insulating member 320 is an insulating composite adhesive layer, a silicone layer or a rubber layer. It is understood that the insulating composite adhesive layer can be a PP composite adhesive layer, a PVC composite adhesive layer or an existing composite adhesive layer with an insulating function.
[0041] like Figure 3 As shown, in one embodiment, the cover plate assembly 300 further includes an electrical isolator 340 , which is connected to a side of the cover plate assembly 300 that is away from the connecting plate 331 .
[0042] like Figure 1 As shown, in one embodiment, the electrical isolator 340 is an insulating adhesive tape. Of course, in other embodiments, the electrical isolator 340 can also be a silicone layer, a rubber layer or other existing insulating layer structures.
[0043] like Figure 1 As shown, in one embodiment, a side of the protrusion 332 facing away from the connecting plate 331 is flush with the electrical isolation member 340, so that the structure of the cover plate assembly 300 is more compact.
[0044] Compared with the prior art, the present invention has at least the following advantages:
[0045] 1. Since the protrusion 332 is arranged toward the winding core 200, the side of the connecting plate 331 facing away from the cover body 310 is a pressure surface. When the clamp applies pressure on the pressure surface of the connecting plate 331, the cover body 310 supports the insulating member 320 and the connecting plate 331. The connecting plate 331 has a tendency to approach the cover body 310, thereby avoiding the problem of the pole 330 being separated from the cover body 310 when under pressure, and suppressing the problem of leakage of the button battery 10 after the top is under pressure.
[0046] 2. The pressure on the connecting plate 331 is transmitted to the insulating member 320, the cover body 310 and the shell 100 in turn, dispersing the pressure of the clamp, reducing stress concentration, reducing the deformation of the button battery 10, and further suppressing the leakage problem of the button battery 10.
[0047] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.
Claims
1. A cover plate assembly, comprising a cover plate body, an insulating member and a pole, wherein the periphery of the cover plate body is used to be connected to the opening of the shell, the cover plate body is provided with a clearance hole, the insulating member is provided with a clearance hole, the pole comprises a connecting plate and a protruding portion, the connecting plate, the insulating member and the cover plate body are sequentially bonded, the protruding portion is connected to one side of the connecting plate, the protruding portion is penetrated through the clearance hole and the avoiding hole, and the protruding portion is spaced apart from the cover plate body; It is characterized in that The cover plate body, the insulating member and the connecting plate are stacked in sequence in a direction away from the winding core, and the protrusion is used to be arranged toward the winding core.
2. The cover plate assembly according to claim 1, It is characterized in that The insulating member completely covers one side surface of the cover plate body.
3. The cover plate assembly according to claim 1, It is characterized in that The peripheral side surface of the connecting plate is flush with the peripheral side surface of the cover plate body.
4. The cover plate assembly according to any one of claims 1 to 3, It is characterized in that The insulating member is provided with a connecting groove, and the cover plate body is located in the connecting groove and bonded to the insulating member.
5. The cover plate assembly according to claim 4, It is characterized in that The cover plate body is completely received in the connecting groove.
6. The cover plate assembly according to claim 1, It is characterized in that The insulating member is an insulating composite adhesive layer, a silicone layer or a rubber layer.
7. The cover plate assembly according to claim 1, It is characterized in that The cover plate assembly further includes an electrical isolator connected to a side surface of the cover plate assembly facing away from the connecting plate.
8. The cover plate assembly according to claim 7, It is characterized in that The electrical isolating element is insulating adhesive tape.
9. The cover plate assembly according to claim 7, It is characterized in that A side of the protrusion facing away from the connecting plate is flush with the electrical isolation member.
10. A button battery, It is characterized in that A cover plate assembly comprising any one of claims 1 to 9.