CN217589351U

CN217589351U - Top cap subassembly and lithium cell

Info

Publication number: CN217589351U
Application number: CN202221056187.3U
Authority: CN
Inventors: 明文豪; 徐峥; 赵生荣; 姜楷; 朱鹏翔; 张敏辉
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-10-14
Anticipated expiration: 2032-04-28

Abstract

The utility model relates to a top cap subassembly and lithium cell, wherein, the top cap subassembly is including apron, electrode terminal and connection piece, electrode terminal with the negative pole terminal interval sets up on the apron, electrode terminal includes briquetting and main part, the briquetting with the main part interval sets up on the apron, the connection piece is used for connecting briquetting and main part and can dismantle with briquetting and main part respectively and be connected, be provided with the fusing structure on the connection piece. This top cap subassembly's connection piece setting is outside the apron, is favorable to the staff to dismantle under safe prerequisite the connection piece after fusing to reinstallate new connection piece, lithium cell can be restoreed and move again. The connection piece replacement operation of the top cover assembly is simple and efficient, the cover plate does not need to be detached, and the air tightness of the lithium battery is guaranteed.

Description

Top cap subassembly and lithium cell

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a top cap subassembly and lithium cell.

Background

The lithium battery has the advantages of small volume, high energy density, long service life, environmental protection and the like, so the lithium battery is widely applied to industries such as automobiles, electronic products and the like. At present, the lithium cell includes electric core, apron and casing, and the fusing structure of lithium cell sets up the inside of casing, then sets up the apron and form sealedly on the casing, and when the electric current on the lithium cell return circuit was too big, fusing structure fuses at first to protect the lithium cell. And the fusing structure can be failed due to fusing, so that the whole lithium battery cannot operate. However, because the fusing structure is located inside the lithium battery, the fusing structure can be replaced only after the cover plate is detached from the shell, the replacement efficiency is low, and the air tightness of the whole lithium battery is affected.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the top cover assembly is simple in structure and high in replacement efficiency of the connecting sheet.

The embodiment of the utility model provides a another aim at: provided is a lithium battery having high safety and good sealing performance.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, a top cover assembly is provided and comprises a cover plate, an electrode terminal and a connecting piece, wherein the electrode terminal is arranged on the cover plate and comprises a pressing block and a main body, the pressing block and the main body are arranged on the cover plate at intervals, the connecting piece is used for connecting the pressing block and the main body and is respectively detachably connected with the pressing block and the main body, and a fusing structure is arranged on the connecting piece.

As a preferred scheme of the top cover assembly, the side wall, close to the main body, of the pressing block is a first side wall, a first groove is formed in the first side wall, the side wall, close to the pressing block, of the main body is a second side wall, a second groove is formed in the second side wall, one end of the connecting piece is inserted into the first groove, and the other end of the connecting piece is inserted into the second groove.

As a preferred scheme of the top cover assembly, a first mounting opening is formed in a side wall, adjacent to the first side wall, of the pressing block, the first mounting opening is communicated with the first groove, a second mounting opening is formed in a side wall, adjacent to the second side wall, of the main body, the second mounting opening is communicated with the second groove, and two opposite ends of the connecting piece are inserted into the first groove and the second groove through the first mounting opening and the second mounting opening respectively.

As a preferable scheme of the top cover assembly, two third grooves are arranged on one side surface, adjacent to the electrode terminal, of the connecting sheet at intervals, first protrusions are arranged on the pressing block corresponding to the third grooves, second protrusions are arranged on the main body corresponding to the third grooves, and the first protrusions and the second protrusions are arranged in the two third grooves respectively.

As a preferable scheme of the top cover assembly, the connecting piece is connected with the pressing block through a screw; and/or the presence of a gas in the atmosphere,

the connecting piece is connected with the main body through screws.

Preferably, the fuse structure is located between the press block and the body.

As a preferred scheme of the top cover assembly, the two opposite side walls of the connecting sheet are respectively provided with a fusing groove in a concave mode, and the fusing structure is formed between the groove bottoms of the two fusing grooves.

As a preferred scheme of the top cover assembly, the connecting piece is provided with a through hole, the through hole penetrates through the connecting piece in the thickness direction, and the fusing structure is formed between the hole wall of the through hole and the side wall of the connecting piece.

As a preferred scheme of top cap subassembly, the top cap subassembly still includes the plastic body, the plastic body sets up on the apron, the plastic body is provided with the mounting groove, the briquetting with the main part is inserted and is established in the mounting groove.

As a preferred scheme of the top cover component, the top cover component further comprises a pole, a fixing hole is formed in the pressing block, and the pole penetrates through the cover plate and is embedded into the fixing hole.

In a second aspect, a lithium battery is provided, which comprises the above cap assembly.

The embodiment of the utility model provides a beneficial effect does: set up briquetting and main part through the interval on the apron to realize the electric conductance between briquetting and the main part through the connection piece and lead to, set up fusing structure on the connection piece, so that when electric current on the lithium cell return circuit is too big, fusing structure fuses at first, so as to protect the lithium cell, and the connection piece setting is outside the apron, be favorable to the staff to pull down the connection piece after fusing under the prerequisite of safety, and after installing new connection piece again, the lithium cell can be restoreed and rerun. Therefore, the connecting piece of the top cover assembly is simple to replace and operate, the cover plate does not need to be disassembled, and the air tightness of the lithium battery is guaranteed.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a first view structural diagram of a top cover assembly according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of fig. 1 at a.

Fig. 3 is a schematic view of a second view structure of the top cap assembly according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a connecting sheet according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a connecting sheet according to an embodiment of the present invention.

In the figure:

1. a cover plate; 11. a liquid injection hole; 2. an electrode terminal; 21. pressing into blocks; 211. a first side wall; 2111. a first groove; 212. a first mounting port; 213. a fixing hole; 22. a main body; 221. a second mounting port; 3. an explosion-proof sheet; 4. connecting sheets; 41. a fusing structure; 42. a fusing groove; 43. a through hole; 44. a first mounting hole; 45. a third mounting hole; 5. a plastic body; 51. mounting grooves; 6. and (4) pole column.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The lithium battery has the advantages of small volume, high energy density, long service life, environmental protection and the like, and is widely applied to industries such as automobiles, electronic products, energy storage systems and the like. At present, the fusing structure of lithium cell sets up lithium cell casing's inside usually, consequently, takes place fusing back when the fusing structure, just can change after needing to dismantle the apron of lithium cell, and not only complex operation still can influence the leakproofness of lithium cell. In order to solve the problem, the utility model discloses a top cap subassembly of easily changing connection piece.

As shown in fig. 1 to 3, the cap assembly of the present invention includes a cap plate 1, an electrode terminal 2, and a connection piece 4. Electrode terminal 2 sets up on apron 1, the lithium cell passes through electrode terminal 2 and is connected with load equipment, the realization is supplied power to load equipment, electrode terminal 2 includes briquetting 21 and main part 22, briquetting 21 and main part 22 interval set up on apron 1, connection piece 4 is used for connecting briquetting 21 and main part 22 and can dismantle with briquetting 21 and main part 22 respectively and be connected, so that briquetting 21 and main part 22 realize through connection piece 4 that the electricity is connected in order to form the return circuit, be provided with fusing structure 41 on the connection piece 4. This top cap subassembly is through setting up fusing structure 41 on connection piece 4 to when making the electric current in the current loop of lithium cell too big, fusing structure 41 fuses at first, in order to protect the lithium cell, and connection piece 4 sets up outside apron 1, is favorable to the staff to the connection piece 4 after fusing to dismantle under the prerequisite of safety, and after connection piece 4 of reinstallating, the lithium cell can be restoreed and rerun. The change easy operation of connection piece 4, and need not to dismantle apron 1, guaranteed the gas tightness of lithium cell.

The electrode terminal 2 may be either a negative electrode terminal or a positive electrode terminal, and in the present embodiment, the electrode terminal 2 is a positive electrode terminal.

In this embodiment, as shown in fig. 1 and fig. 2, a side wall of the pressing block 21 adjacent to the main body 22 is a first side wall 211, a first groove 2111 is provided on the first side wall 211, a side wall of the main body 22 adjacent to the pressing block 21 is a second side wall, a second groove is provided on the second side wall, one end of the connecting piece 4 is inserted into the first groove 2111, and the other end is inserted into the second groove. On one hand, the design can increase the contact area between the connecting piece 4 and the pressing block 21 and the main body 22, thereby improving the conductivity of the connecting piece 4; on the other hand, the connecting sheet 4 is inserted into the first groove 2111 and the second groove to realize pre-fixing, so that the installation efficiency of the connecting sheet 4 is improved. The replacement efficiency of the connection piece 4 is improved.

Specifically, a first mounting port 212 is formed in a side wall of the pressing block 21 adjacent to the first side wall 211, the first mounting port 212 is communicated with the first groove 2111, a second mounting port 221 is formed in a side wall of the main body 22 adjacent to the second side wall, the second mounting port 221 is communicated with the second groove, two opposite ends of the connecting piece 4 are inserted into the first groove 2111 and the second groove through the first mounting port 212 and the second mounting port 221, so that the assembly and disassembly efficiency of the connecting piece 4 on the electrode terminal 2 is further improved, and a worker can directly insert or take out the connecting piece 4 from the mounting port. In other embodiments, the pressing block 21 and the main body 22 may not be provided with mounting openings, and the connecting piece 4 is made of an elastic material or a soft material, and the connecting piece 4 is bent to insert the opposite ends of the connecting piece 4 into the first and

second grooves

2111 and 2111.

In an embodiment, the first notch 2111 is formed along the thickness direction of the pressing block 21, in other words, the first notch 2111 is located on a side surface of the pressing block 21 away from the cover plate 1, and similarly, the second notch is located on a side surface of the main body 22 away from the cover plate 1.

In another embodiment, two third grooves (not shown in the drawings) are formed at intervals on a side surface of the connecting piece 4 adjacent to the electrode terminal 2, the pressing piece 21 is provided with a first protrusion (not shown in the drawings) corresponding to the third grooves, the main body 22 is provided with a second protrusion (not shown in the drawings) corresponding to the third grooves, and the first protrusion and the second protrusion are respectively arranged in the two third grooves, so that the connection stability between the connecting piece 4 and the main body 22 as well as the pressing piece 21 is higher.

Preferably, the third groove is formed by stamping the connecting piece 4, the stamping process is simple, the processing cost is low, and the strength of the connecting piece 4 can be increased.

In this embodiment, connection piece 4 passes through screw respectively with briquetting 21 and main part 22 fixed connection, and threaded connection stability is higher, and is difficult not hard up, and the change efficiency is higher. Specifically, one end of the connecting piece 4 is provided with a first mounting hole 44, the pressing piece 21 is provided with a second mounting hole corresponding to the first mounting hole 44, and screws are screwed in the first mounting hole 44 and the second mounting hole to fix the connecting piece 4 and the pressing piece 21. A third mounting hole 45 is formed at the other end of the connecting piece 4, a fourth mounting hole is formed in the main body 22 corresponding to the third mounting hole 45, and screws are screwed into the third mounting hole 45 and the fourth mounting hole to fix the main body 22 and the connecting piece 4. In other embodiments, other connection manners, such as clamping, bonding, or welding, may also be used between the connecting piece 4 and the pressing piece 21 and the main body 22, which is not limited to this embodiment.

Specifically, fusing structure 41 is located between pressing block 21 and main body 22, the fusing function of fusing structure 41 is not influenced by pressing block 21 and main body 22 of this design, the current between pressing block 21 and main body 22 is concentrated on fusing structure 41 and circulates, and when the current is too big, fusing structure 41 can be fused rapidly to protect the lithium battery.

Specifically, as shown in fig. 4, the connecting sheet 4 is provided with two opposite outer side walls, which are respectively provided with a fusing groove 42 in a concave manner, a fusing structure 41 is formed between the groove bottoms of the two fusing grooves 42, the connecting sheet 4 is in an i shape, and the fusing structure 41 is locally weak due to the two fusing grooves 42 arranged on the connecting sheet 4, and when the current is too large, the area is preferentially fused.

In one embodiment, as shown in fig. 5, the connecting sheet 4 is provided with a through hole 43, the through hole 43 is arranged to penetrate along the thickness direction of the connecting sheet 4, a fusing structure 41 is formed between the hole wall of the through hole 43 and the outer side wall of the connecting sheet 4, the fusing structure 41 can also be locally weakened by forming the through hole 43 on the connecting sheet 4, and when the current is too large, the fusing structure preferentially fuses. And a through hole 43 is formed in the connecting sheet 4, so that the process is simpler compared with the process of forming two fusing grooves 42 in the connecting sheet 4.

Of course, in addition to the above-mentioned fusing structure, the fusing structure 41 may also be a fuse wire separately disposed on the connecting piece, and is not limited to this embodiment.

In this embodiment, as shown in fig. 1 and 3, the top cap assembly further includes a plastic body 5, the plastic body 5 is disposed between the electrode terminal 2 and the cover plate 1, the plastic body 5 is provided with a mounting groove 51, the pressing block 21 and the main body 22 are inserted into the mounting groove 51, so that the plastic body 5 can be used for accommodating the pressing block 21 and the main body 22, and the plastic body 5 can insulate and isolate the electrode terminal 2 and the cover plate 1, thereby preventing the cover plate 1 and the electrode terminal 2 from being directly communicated with each other.

Specifically, as shown in fig. 1 and 3, the top cover assembly further includes a pole post 6, a fixing hole 213 is formed in the pressing block 21, the pole post 6 penetrates through the cover plate 1 and is embedded into the fixing hole 213, so that connection stability between the pole post 6 and the pressing block 21 is high, the pole post 6 is electrically conducted with the pressing block 21, then the pressing block 21 is electrically connected with the main body 22 through the connecting piece 4, when the lithium battery supplies power for a load, the electric equipment is electrically connected with the main body 22 through the connecting piece, and when the connecting piece 4 is fused, the pressing block 21 is disconnected from the main body 22, so that the lithium battery no longer supplies power for the load. In this embodiment, the pressing block 21 is riveted with the pole 6.

Specifically, the cover plate 1 is a rectangular metal sheet, chamfers are arranged on the periphery of the metal sheet, a pole column hole is formed in the cover plate 1, and the pole column 6 penetrates through the pole column hole to be riveted with the pressing block 21.

Preferably, after the pole post 6 and the pressing block 21 are riveted, the pole post 6 and the pressing block 21 are further fixed by welding, so that the connection reliability between the pole post 6 and the pressing block 21 is improved.

Specifically, as shown in fig. 1, a liquid injection hole 11 is formed in the cover plate 1, and after the cover plate 1 is covered on a casing of a lithium battery, a worker can add electrolyte to the lithium battery through the liquid injection hole 11. In this embodiment, the filling hole 11 is a stepped hole.

Specifically, as shown in fig. 1, an explosion-proof sheet 3 is disposed on the cover plate 1, the explosion-proof sheet 3 is spaced from the liquid injection hole 11, and when the air pressure in the lithium battery rises, the air pressure in the lithium battery can burst the explosion-proof sheet 3 to release the pressure, so as to prevent the lithium battery from exploding.

Preferably, the explosion-proof sheet 3 is provided with an indentation, the explosion-proof effect of the explosion-proof sheet 3 can be improved by the indentation, and when the air pressure is increased, the air can be firstly broken at the indentation.

The utility model discloses still disclose a lithium cell, its top cap subassembly that includes above-mentioned arbitrary embodiment, this top cap subassembly's connection piece 4 is provided with fusing structure 41 to make this battery have higher security, and set up connection piece 4 in the outside of apron 1, so that fusing structure 41 takes place the back of fusing, and the staff can change connection piece 4 under the prerequisite of not dismantling apron 1, has guaranteed the leakproofness of battery.

In the description herein, it is to be understood that the terms "upper", "lower", and the like are used in an orientation or positional relationship based on that shown in the drawings for convenience of description and simplicity of operation, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the description herein, references to the description of "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The top cover assembly comprises a cover plate and an electrode terminal, wherein the electrode terminal is arranged on the cover plate, and the top cover assembly is characterized by further comprising a connecting piece, the electrode terminal comprises a pressing block and a main body, the pressing block and the main body are arranged on the cover plate at intervals, the connecting piece is used for connecting the pressing block and the main body and is respectively detachably connected with the pressing block and the main body, and a fusing structure is arranged on the connecting piece.

2. The top cap assembly of claim 1, wherein the sidewall of the compact adjacent to the body is a first sidewall having a first groove disposed thereon, the sidewall of the body adjacent to the compact is a second sidewall having a second groove disposed thereon, one end of the connecting tab is inserted into the first groove and the other end is inserted into the second groove.

3. The top cover assembly of claim 2, wherein a first mounting opening is provided in a side wall of the pressing block adjacent to the first side wall, the first mounting opening is in communication with the first groove, a second mounting opening is provided in a side wall of the main body adjacent to the second side wall, the second mounting opening is in communication with the second groove, and opposite ends of the connecting piece are inserted into the first groove and the second groove through the first mounting opening and the second mounting opening, respectively.

4. The header assembly of claim 2, wherein two third grooves are spaced apart from one side of the connecting piece adjacent to the electrode terminal, the pressing piece is provided with a first protrusion corresponding to the third grooves, the main body is provided with a second protrusion corresponding to the third grooves, and the first protrusion and the second protrusion are respectively disposed in the two third grooves.

5. The header assembly of claim 1, wherein the connecting tab is connected to the press block by screws; and/or the presence of a gas in the atmosphere,

the connecting piece is connected with the main body through screws.

6. The header assembly of claim 1, wherein the fuse structure is located between the compact and the body.

7. The top cap assembly of claim 6, wherein the connecting tab has two opposite side walls each recessed with a fuse slot, the fuse structure being formed between the bottom of each of the fuse slots.

8. The top cap assembly of claim 6, wherein the connecting piece is provided with a through hole, the through hole penetrates through the connecting piece in the thickness direction, and the fusing structure is formed between the wall of the through hole and the side wall of the connecting piece.

9. The header assembly of claim 1, further comprising a plastic body disposed on the cover plate, the plastic body having a mounting slot, the pressing block and the main body each being inserted in the mounting slot.

10. The top cover assembly according to claim 1, further comprising a post, wherein the pressing block is provided with a fixing hole, and the post penetrates through the cover plate and is embedded into the fixing hole.

11. A lithium battery comprising a cap assembly according to any one of claims 1 to 9.