Top cover structure and cylindrical battery

Abstract

The utility model provides a top cover structure and a cylindrical battery. The top cover structure comprises a top cover main body, a connecting sheet body, a confluence disc body and an insulating part, the connecting sheet body comprises a tail body part, a first bending part, an inclined part and a second bending part which are connected in sequence, the tail body part is connected with the top cover main body, the first bending part is used for bending so that the inclined part can be obliquely arranged relative to the top cover main body, and the second bending part is provided with a hollow notch; the hollow gap divides the second bending part into a first bending body and a second bending body; the confluence plate body is connected with the first bent body and the second bent body, and the first bent body and the second bent body are bent towards the inner side of the top cover main body, so that the confluence plate body and the top cover main body are oppositely arranged; the insulating part is connected to one side, close to the confluence plate body, of the inclined part, and the insulating part abuts against the confluence plate body. By adopting the top cover structure, the use safety of the cylindrical battery is better.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cylindrical batteries, and in particular to a top cover structure and a cylindrical battery. Background Art

[0002] Cylindrical battery is an electrochemical device with a cylindrical shape that can convert chemical energy into electrical energy. Cylindrical batteries are widely used in new energy vehicles, laptops, smart phones, digital cameras, lighting tools, energy storage and other fields. Cylindrical batteries are composed of a top cover structure and a column shell structure. The column shell structure has a storage cavity, and the top cover structure is covered in the storage cavity and connected to the column shell structure.

[0003] In the prior art, the traditional top cover structure includes a top cover body, a connecting plate and a current collecting plate, one end of the connecting plate is connected to the top cover body, the other end of the connecting plate is connected to the current collecting plate, and the connecting plate is electrically connected to the top cover body and the current collecting plate respectively, and the connecting plate is provided with a bending portion, and the connecting plate is bent toward the inner side of the top cover body along the bending portion so that the top cover body and the current collecting plate are arranged relative to each other.

[0004] The connecting piece is provided with a bending portion, and a hollow notch is opened in the middle of the bending portion, so that the connection area between the connecting piece and the current collecting disk is reduced, thereby reducing the current flow capacity between the connecting piece and the current collecting disk; when a short circuit occurs in the cylindrical battery, the current flowing through the current path inside the cylindrical battery is relatively large, so that the current flowing between the connecting piece and the current collecting disk is relatively large, but the current flow capacity between the connecting piece and the current collecting disk is relatively small, so that it is difficult for a large current to act on the connection between the connecting piece and the current collecting disk to complete the flow, resulting in a higher temperature at the connection between the connecting piece and the current collecting disk, so that the connection between the connecting piece and the current collecting disk is easier to melt at high temperature, thereby causing the connection between the connecting piece and the current collecting disk to break and form a gap, so that the current path inside the cylindrical battery is disconnected to form a current short circuit, so that the current cannot flow, and the current flow inside the cylindrical battery is blocked.

[0005] However, after the connection between the connecting piece and the current collecting disk is broken to form a gap and block the current, since the connecting piece and the current collecting disk still remain in their original positions, under the action of external force, the gap between the connecting piece and the current collecting disk is easier to fill and form a connection again, so that the connecting piece and the current collecting disk are in contact and connected again, so that there is still a certain contact connection between the current collecting disk and the top cover body, so that the current can still flow to the top cover body through the current collecting disk, so that the current path inside the cylindrical battery is not completely disconnected, resulting in the current cannot be completely blocked, so that the cylindrical battery continues to heat up under the action of the current and is more prone to thermal runaway, which is not convenient for the safe use of the cylindrical battery, and thus makes the use safety of the cylindrical battery poor. Utility Model Content

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a top cover structure and a cylindrical battery that make the use of cylindrical batteries safer.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A top cover structure, comprising:

[0009] Top cover body;

[0010] The connecting sheet body comprises a tail body, a first bending portion, an inclined portion and a second bending portion connected in sequence, wherein the tail body is connected to the top cover body, the first bending portion is used for bending so that the inclined portion is inclined relative to the top cover body, and the second bending portion is provided with a hollow notch, and the hollow notch separates the second bending portion into a first bending body and a second bending body;

[0011] a conduit body connected to the first bending body and the second bending body respectively, wherein the first bending body and the second bending body are bent toward the inner side of the top cover body so that the conduit body and the top cover body are arranged opposite to each other; and

[0012] The insulating portion is connected to a side of the inclined portion adjacent to the busbar body, and the insulating portion is also in contact with the busbar body.

[0013] In one embodiment, the tail body, the first bent portion, the inclined portion, the first bent body, the second bent body and the busbar body are an integrally formed structure.

[0014] In one embodiment, the tail body is welded to the top cover body.

[0015] In one embodiment, the insulating portion is an insulating tape structure.

[0016] In one embodiment, the thickness of the insulating portion is 10 μm to 100 μm.

[0017] In one embodiment, the insulating portion is a ceramic insulating layer structure or a boehmite insulating layer structure.

[0018] In one embodiment, the thickness of the insulating portion is 5 μm to 100 μm.

[0019] In one embodiment, the busbar body is provided with a plurality of connection grooves, and the plurality of connection grooves are arranged at intervals around the outer peripheral wall of the busbar body.

[0020] In one of the embodiments, a pole portion is provided on a side of the top cover body facing away from the tail body portion.

[0021] A cylindrical battery comprises a cylindrical shell structure and a top cover structure as described in any one of the above embodiments, wherein the cylindrical shell structure is provided with a storage cavity, and the top cover structure is covered in the storage cavity and connected to the cylindrical shell structure.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] 1. Since the second bending portion is provided with a hollow notch, the hollow notch separates the second bending portion into a first bending body and a second bending body, and the busbar body is connected to the first bending body and the second bending body respectively, so that the connection area between the connecting sheet body and the busbar body is reduced, thereby reducing the flow capacity between the connecting sheet body and the busbar body, that is, the flow capacity of the second bending portion is reduced. When the cylindrical battery is short-circuited, due to the small flow capacity of the second bending portion, it is difficult for a large current to flow through the second bending portion, resulting in a higher temperature of the second bending portion, so that the second bending portion is easier to melt at high temperature, so that the connection between the connecting sheet body and the busbar body is broken to form a gap for blocking the current;

[0024] 2. After the connection between the connecting piece and the collecting plate is broken to form a gap and block the current, since the insulating part is connected to the side of the inclined part adjacent to the collecting plate, the insulating part is also in contact with the collecting plate, and the insulating part is used to open the collecting plate outward, so that the insulating part covers the inclined part, so that the positions of the connecting piece and the collecting plate are changed, thereby avoiding the problem that the connecting piece and the collecting plate in the prior art still remain in the original position, and further solving the problem that under the action of external force, the gap between the connecting piece and the collecting plate is easier to close and form a connection again in the prior art. The insulating part covers the inclined part so that the gap between the connecting piece and the collecting plate is closer to the collecting plate. The gap between them is difficult to fill and form a connection again, so that the connecting sheet body and the collector plate body cannot be contacted and connected again, thereby solving the problem of contact connection between the collector plate and the top cover body in the prior art. The collector plate body is disconnected from the top cover body, so that the current cannot flow to the top cover body through the collector plate body, so that the current path inside the cylindrical battery is completely disconnected, so that the current is completely blocked, thereby solving the problem of cylindrical batteries in the prior art that they are prone to thermal runaway due to continuous heating under the action of current, making it more difficult for cylindrical batteries to have thermal runaway, which is conducive to the safe use of cylindrical batteries, and thus makes the use of cylindrical batteries safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 This is a schematic structural diagram of a top cover structure according to an embodiment;

[0027] Figure 2 is a schematic structural diagram of a top cover structure of another embodiment;

[0028] Figure 3 for Figure 1 A structural schematic diagram of the top cover structure from another perspective shown;

[0029] Figure 4 for Figure 1 A structural schematic diagram of another embodiment of a top cover structure from one viewing angle is shown. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The present invention provides a top cover structure, comprising a top cover body, a connecting sheet body, a busbar body and an insulating portion; the connecting sheet body comprises a tail body portion, a first bending portion, an inclined portion and a second bending portion connected in sequence, the tail body portion is connected to the top cover body, the first bending portion is used for bending processing, so that the inclined portion is inclined relative to the top cover body, the second bending portion is provided with a hollow notch, and the hollow notch separates the second bending portion into a first bending body and a second bending body; the busbar body is respectively connected to the first bending body and the second bending body, and the first bending body and the second bending body are both bent toward the inner side of the top cover body, so that the busbar body and the top cover body are arranged opposite to each other; the insulating portion is connected to a side of the inclined portion adjacent to the busbar body, and the insulating portion also abuts against the busbar body.

[0034] In the above-mentioned top cover structure, since the second bending part is provided with a hollow notch, the hollow notch separates the second bending part into a first bending body and a second bending body, and the busbar body is connected to the first bending body and the second bending body respectively, so that the connection area between the connecting sheet body and the busbar body is reduced, thereby reducing the flow capacity between the connecting sheet body and the busbar body, that is, the flow capacity of the second bending part is reduced. When the cylindrical battery is short-circuited, since the flow capacity of the second bending part is small, it is difficult for a large current to flow through the second bending part, resulting in a higher temperature of the second bending part, so that the second bending part is easier to melt at high temperature, so that the connection between the connecting sheet body and the busbar body is broken to form a gap for blocking the current;

[0035] After the connection between the connecting piece and the collecting plate is broken to form a gap and block the current, since the insulating part is connected to the side of the collecting plate body adjacent to the inclined part, the insulating part is also in contact with the collecting plate body, and the insulating part is used to open the collecting plate body outward so that the insulating part covers the inclined part, so that the positions of the connecting piece and the collecting plate body are changed, thereby avoiding the problem that the connecting piece and the collecting plate in the prior art still remain in the original position, and further solving the problem that under the action of external force, the gap between the connecting piece and the collecting plate is easier to close and form a connection again in the prior art, and the insulating part covers the inclined part so that the gap between the connecting piece and the collecting plate is easier to close and form a connection again. The gap is difficult to fill and form a connection again, so that the connecting sheet body and the collector plate body cannot be contacted and connected again, thereby solving the problem of contact connection between the collector plate and the top cover body in the prior art. The collector plate body is disconnected from the top cover body, so that the current cannot flow to the top cover body through the collector plate body, so that the current path inside the cylindrical battery is completely disconnected, so that the current is completely blocked, thereby solving the problem of cylindrical batteries in the prior art that they are prone to thermal runaway due to continuous heating under the action of current, making it more difficult for cylindrical batteries to have thermal runaway, which is conducive to the safe use of cylindrical batteries, and thus makes the use of cylindrical batteries safer.

[0036] 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:

[0037] like Figures 1 to 4 As shown, a top cover structure 10 of an embodiment includes a top cover body 100, a connecting sheet body 200, a busbar body 300 and an insulating portion 400; the connecting sheet body 200 includes a tail body portion 210, a first bending portion 220, an inclined portion 230 and a second bending portion 240 connected in sequence, the tail body portion 210 is connected to the top cover body 100, the first bending portion 220 is used for bending processing, so that the inclined portion 230 is inclined relative to the top cover body 100, and the second bending portion 240 is provided with a hollow notch 241. The gap 241 separates the second bending portion 240 into a first bending body 242 and a second bending body 243; the busbar body 300 is connected to the first bending body 242 and the second bending body 243 respectively, and the first bending body 242 and the second bending body 243 are both bent toward the inner side of the top cover body 100 so that the busbar body 300 is arranged opposite to the top cover body 100; the insulating portion 400 is connected to the side of the inclined portion 230 adjacent to the busbar body 300, and the insulating portion 400 also abuts against the busbar body 300.

[0038] In this embodiment, the second bending portion 240 is provided with a hollow notch 241, which separates the second bending portion 240 into a first bending body 242 and a second bending body 243. The busbar body 300 is respectively connected to the first bending body 242 and the second bending body 243, so that the connection area between the connecting sheet body 200 and the busbar body 300 is reduced, thereby reducing the flow capacity between the connecting sheet body 200 and the busbar body 300.

[0039] In the above-mentioned top cover structure 10, since the second bending portion 240 is provided with a hollow notch 241, the hollow notch 241 separates the second bending portion 240 into a first bending body 242 and a second bending body 243, and the busbar body 300 is connected to the first bending body 242 and the second bending body 243 respectively, so that the connection area between the connecting sheet body 200 and the busbar body 300 is reduced, thereby reducing the flow capacity between the connecting sheet body 200 and the busbar body 300, that is, the flow capacity of the second bending portion 240 is reduced. When the cylindrical battery is short-circuited, due to the small flow capacity of the second bending portion 240, it is difficult for a large current to flow through the second bending portion 240, resulting in a higher temperature of the second bending portion 240, so that the second bending portion 240 is easier to melt at high temperature, so that the connection between the connecting sheet body 200 and the busbar body 300 is broken to form a gap for blocking the current;

[0040] After the connection between the connecting sheet body 200 and the bus plate body 300 is broken to form a gap and block the current, since the insulating portion 400 is connected to the side of the inclined portion 230 adjacent to the bus plate body 300, the insulating portion 400 is also in contact with the bus plate body 300, and the insulating portion 400 is used to open the bus plate body 300 outward so that the insulating portion 400 covers the inclined portion 230, so that the positions of the connecting sheet body 200 and the bus plate body 300 are changed, thereby avoiding the problem of the connecting sheet and the collector still remaining in the original position in the prior art, and further solving the problem of the prior art that the gap between the connecting sheet and the collector is easier to close and form a connection again under the action of external force. The insulating portion 400 covers the inclined portion 230 so that the connecting sheet and the collector still remain in the original position. The gap between the connecting piece body 200 and the busbar body 300 is difficult to fill and form a connection again, so that the connecting piece body 200 and the busbar body 300 cannot be contacted and connected again, thereby solving the problem of contact connection between the collector and the top cover body in the prior art. The busbar body 300 is disconnected from the top cover body 100, so that the current cannot flow to the top cover body 100 through the busbar body 300, so that the current path inside the cylindrical battery is completely disconnected, so that the current is completely blocked, thereby solving the problem of cylindrical batteries in the prior art that they are prone to thermal runaway due to continuous heating under the action of current, making it more difficult for cylindrical batteries to have thermal runaway, which is conducive to the safe use of cylindrical batteries, and thus makes the use of cylindrical batteries safer.

[0041] like Figures 2 to 4 As shown, in one embodiment, the tail body 210, the first bending portion 220, the inclined portion 230, the first bending body 242, the second bending body 243 and the busbar body 300 are an integrally formed structure, so that the structural strength between the connecting sheet body 200 and the busbar body 300 is better, thereby making the structural stability of the top cover structure 10 better.

[0042] like Figures 2 to 4 As shown, in one embodiment, the tail body 210 is welded to the top cover body 100 so that the connection strength between the tail body 210 and the top cover body 100 is higher, so that the connection stability between the connecting sheet 200 and the top cover body 100 is better.

[0043] like Figures 2 to 4 As shown, in one embodiment, the insulating portion 400 is an insulating tape structure. In this embodiment, the insulating portion 400 is an insulating green glue structure or an insulating yellow glue structure.

[0044] like Figures 2 to 4 As shown, in one embodiment, the thickness of the insulating portion 400 is 10 μm to 100 μm.

[0045] like Figures 2 to 4As shown, in one embodiment, the insulating portion 400 is a ceramic insulating layer structure or a boehmite insulating layer structure.

[0046] like Figures 2 to 4 As shown, in one embodiment, the thickness of the insulating portion 400 is 5 μm to 100 μm.

[0047] like Figure 2 As shown, in one embodiment, the busbar body 300 is provided with a plurality of connection grooves 310 , and the plurality of connection grooves 310 are arranged around and spaced apart along the outer peripheral wall of the busbar body 300 .

[0048] like Figures 1 to 4 As shown, in one embodiment, a pole portion 110 is disposed on a side of the top cover body 100 facing away from the tail body portion 210 .

[0049] The present disclosure further provides a cylindrical battery, comprising a cylindrical shell structure and the top cover structure 10 described in any of the above embodiments, wherein the cylindrical shell structure is provided with a storage cavity, and the top cover structure 10 is covered in the storage cavity and connected to the cylindrical shell structure.

[0050] Compared with the prior art, the present invention has at least the following advantages:

[0051] 1. Since the second bending portion 240 is provided with a hollow notch 241, the hollow notch 241 separates the second bending portion 240 into a first bending body 242 and a second bending body 243, and the busbar body 300 is connected to the first bending body 242 and the second bending body 243 respectively, so that the connection area between the connecting sheet body 200 and the busbar body 300 is reduced, thereby reducing the flow capacity between the connecting sheet body 200 and the busbar body 300, that is, the flow capacity of the second bending portion 240 is reduced. When the cylindrical battery is short-circuited, due to the small flow capacity of the second bending portion 240, it is difficult for a large current to flow through the second bending portion 240, resulting in a higher temperature of the second bending portion 240, so that the second bending portion 240 is easier to melt at high temperature, so that the connection between the connecting sheet body 200 and the busbar body 300 is broken to form a gap for blocking the current;

[0052] 2. After the connection between the connecting piece body 200 and the bus plate body 300 is broken to form a gap to block the current, since the insulating part 400 is connected to the side of the inclined part 230 adjacent to the bus plate body 300, the insulating part 400 is also in contact with the bus plate body 300, and the insulating part 400 is used to open the bus plate body 300 outward, so that the insulating part 400 covers the inclined part 230, so that the positions of the connecting piece body 200 and the bus plate body 300 are changed, thereby avoiding the problem that the connecting piece and the collector plate in the prior art still remain in the original position, and further solving the problem that under the action of external force in the prior art, the gap between the connecting piece and the collector plate is easier to close and form a connection again. The insulating part 400 covers the inclined part 230 so that The gap between the connecting sheet body 200 and the busbar body 300 is difficult to fill and form a connection again, so that the connecting sheet body 200 and the busbar body 300 cannot be contacted and connected again, thereby solving the problem of contact connection between the collector and the top cover body in the prior art. The busbar body 300 is disconnected from the top cover body 100, so that the current cannot flow to the top cover body 100 through the busbar body 300, so that the current path inside the cylindrical battery is completely disconnected, so that the current is completely blocked, thereby solving the problem of cylindrical batteries in the prior art that they are prone to thermal runaway due to continuous heating under the action of current, making it more difficult for cylindrical batteries to have thermal runaway, which is conducive to the safe use of cylindrical batteries, and thus makes the use of cylindrical batteries safer.

[0053] 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 top cover structure, characterized in that: include: Top cover body; The connecting sheet body comprises a tail body, a first bending portion, an inclined portion and a second bending portion connected in sequence, wherein the tail body is connected to the top cover body, the first bending portion is used for bending so that the inclined portion is inclined relative to the top cover body, and the second bending portion is provided with a hollow notch, and the hollow notch separates the second bending portion into a first bending body and a second bending body; a conduit body connected to the first bending body and the second bending body respectively, wherein the first bending body and the second bending body are bent toward the inner side of the top cover body so that the conduit body and the top cover body are arranged opposite to each other; and The insulating portion is connected to a side of the inclined portion adjacent to the busbar body, and the insulating portion is also in contact with the busbar body.

2. The top cover structure according to claim 1, characterized in that: The tail body, the first bending portion, the inclined portion, the first bending body, the second bending body and the busbar body are an integrally formed structure.

3. The top cover structure according to claim 1, characterized in that: The tail body is welded to the top cover body.

4. The top cover structure according to claim 1, characterized in that: The insulating part is an insulating tape structure.

5. The top cover structure according to claim 4, characterized in that: The thickness of the insulating portion is 10 μm to 100 μm.

6. The top cover structure according to claim 1, characterized in that: The insulating part is a ceramic insulating layer structure or a boehmite insulating layer structure.

7. The top cover structure according to claim 6, characterized in that: The thickness of the insulating portion is 5 μm to 100 μm.

8. The top cover structure according to claim 1, characterized in that: The busbar body is provided with a plurality of connection grooves, and the plurality of connection grooves are arranged around and spaced along the outer peripheral wall of the busbar body.

9. The top cover structure according to claim 1, characterized in that: A pole portion is disposed on a side of the top cover body away from the tail body portion.

10. A cylindrical battery, characterized in that: It comprises a column shell structure and a top cover structure as described in any one of claims 1 to 9, wherein the column shell structure is provided with a storage cavity, and the top cover structure is covered in the storage cavity and connected to the column shell structure.

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