CN218975614U

CN218975614U - Top cap subassembly and battery

Info

Publication number: CN218975614U
Application number: CN202223169931.3U
Authority: CN
Inventors: 王俊敏; 贺孝武; 舒宽金; 袁威; 安苏礼; 邓振
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-05-05
Anticipated expiration: 2032-11-23

Abstract

The utility model relates to a top cover assembly and a battery, wherein the top cover assembly comprises a cover plate, terminals and polar posts, the terminals and the polar posts are respectively arranged on two opposite sides of the cover plate, a first through hole is formed in the cover plate in a penetrating mode, the polar post part penetrates through the first through hole to be connected with the terminals, a first ceramic layer is arranged on the contact surface of the terminals and the cover plate, and an isolation layer is arranged on the contact surface of the polar posts and the cover plate. By arranging the first ceramic layer to replace plastic parts between the terminals and the cover plate, the thickness and the manufacturing cost of the top cover assembly are reduced, the number of parts of the top cover assembly is simplified, and the assembly efficiency of the top cover assembly is improved.

Description

Top cap subassembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery.

Background

The top cap assembly is an important component of the battery, and serves to seal the opening of the battery case. At present, the top cover assembly comprises a cover plate, a pole column, a terminal, upper plastic and lower plastic, wherein the pole column and the terminal are respectively arranged on two opposite sides of the cover plate, the upper plastic is positioned between the cover plate and the terminal, the lower plastic is positioned between the cover plate and the pole column, and the top cover assembly is formed by lamination assembly of the parts. The existing top cover assembly has the following problems that the thickness and the assembly difficulty of the top cover assembly are increased due to the fact that the upper plastic is arranged between the cover plate and the terminal, and therefore the top cover assembly is high in manufacturing cost.

Disclosure of Invention

One object of an embodiment of the utility model is to: provided is a top cover assembly which has a simple structure, a thin thickness and a low manufacturing cost.

Another object of an embodiment of the utility model is to: provided is a battery having a simple structure and a high energy density.

To achieve the purpose, the embodiment of the utility model adopts the following technical scheme:

in a first aspect, a top cover assembly is provided, including a cover plate, a terminal and a pole, the terminal with the pole sets up respectively the relative both sides of cover plate, the cover plate runs through and is provided with first through-hole, pole part pass first through-hole with the terminal is connected, the terminal with be provided with first ceramic layer on the contact surface of cover plate, the pole with be provided with the isolation layer on the contact surface of cover plate.

As a preferable scheme of the top cover assembly, the isolation layer is a second ceramic layer or a plastic part.

As a preferred scheme of top cap subassembly, the terminal includes positive electrode terminal and negative electrode terminal, the utmost point post includes positive electrode post and negative electrode post, be provided with two at least first through-hole on the apron, positive electrode post part pass one of them first through-hole with positive electrode terminal is connected, negative electrode post part pass another first through-hole with negative electrode terminal is connected, first ceramic layer includes conductive ceramic layer and insulating ceramic layer, positive electrode terminal with the contact surface of apron is provided with conductive ceramic layer, negative electrode terminal with the contact surface of apron is provided with insulating ceramic layer.

As a preferable scheme of the top cover assembly, a first mounting groove is concavely formed in one side face, facing the terminal, of the cover plate, the first mounting groove is communicated with the first through hole, and at least part of the positive electrode terminal is arranged in the first mounting groove;

the end face of the positive electrode terminal, which faces the bottom of the first mounting groove, is provided with the conductive ceramic layer and/or the conductive ceramic layer;

the side face of the positive electrode terminal, which faces the groove wall of the first mounting groove, is provided with the conductive ceramic layer.

As a preferable scheme of the top cover assembly, a first mounting groove is concavely formed in one side face, facing the terminal, of the cover plate, the first mounting groove is communicated with the first through hole, and at least part of the negative terminal is arranged in the first mounting groove;

the end face of the negative electrode terminal, which faces the bottom of the first mounting groove, is provided with the insulating ceramic layer;

the side face of the negative electrode terminal, which faces the groove wall of the first mounting groove, is provided with the insulating ceramic layer.

As a preferable scheme of the top cover component, the resistivity of the conductive ceramic layer is R1, and R1 is more than or equal to 50 Ω and less than or equal to 10000 Ω; and/or the number of the groups of groups,

the resistivity of the insulating ceramic layer is R2, and R2 is more than or equal to 1G omega.

As a preferable scheme of the top cover assembly, the pole comprises a pole plate and a body, the body is arranged on the pole plate, the body penetrates through the first through hole to be connected with the terminal, and one side face, facing the cover plate, of the pole plate is provided with the isolation layer.

As a preferred embodiment of the cap assembly, the first ceramic layer is disposed on the terminal by thermal spraying or bonding.

As a preferable scheme of the top cover component, the thickness of the first ceramic layer is H1, H1 is less than or equal to 1um and less than or equal to 50um.

In a second aspect, a battery is provided, which includes a housing, a battery cell and the top cover assembly, the battery cell is disposed in the housing, and the top cover assembly is disposed at an opening of the housing.

The embodiment of the utility model has the beneficial effects that: through being provided with first ceramic layer on the contact surface of terminal and apron to replaced the plastic part between terminal and the apron, reduced thickness and manufacturing cost of this top cap subassembly, and simplified the part quantity of top cap subassembly, improved this top cap subassembly assembly efficiency.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a top cap assembly according to an embodiment of the present utility model.

Fig. 2 is a schematic exploded view of a top cap assembly according to an embodiment of the present utility model.

Fig. 3 is a partial cross-sectional view of a cap assembly according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a cover plate according to an embodiment of the utility model.

In the figure:

1. a cover plate; 11. a first through hole; 12. a first mounting groove; 13. a reinforcing part; 14. a second mounting groove; 2. a terminal; 21. a positive electrode terminal; 22. a negative electrode terminal; 3. a pole; 31. a positive electrode post; 311. a positive electrode plate; 312. a positive electrode body; 32. a negative electrode post; 321. a negative electrode plate; 322. a negative electrode body; 4. a first ceramic layer; 41. a conductive ceramic layer; 42. an insulating ceramic layer; 5. an isolation layer; 6. and a seal.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

At present, the top cover assembly comprises a cover plate, a pole column, a terminal, upper plastic and lower plastic, wherein the pole column and the terminal are respectively arranged on two opposite sides of the cover plate, the upper plastic is positioned between the cover plate and the terminal, the lower plastic is positioned between the cover plate and the pole column, and the top cover assembly is formed by assembling the parts. The existing top cover assembly has the following problems that as the upper plastic is arranged between the cover plate and the terminal, the thickness and the assembly difficulty of the top cover assembly are increased, and the manufacturing cost of the top cover assembly is increased.

In order to solve the above problems, as shown in fig. 1 and 2, the present utility model discloses a top cap assembly, which includes a cap plate 1, terminals 2 and poles 3, the terminals 2 and poles 3 are respectively disposed at opposite sides of the cap plate 1, the cap plate 1 is provided with a first through hole 11 therethrough, and the poles 3 are partially connected with the terminals 2 through the first through hole 11. The pole 3 is connected with the tab of the battery, the terminal 2 is used for being connected with the load equipment, and the pole 3 is electrically connected with the terminal 2, so that the inside of the cover plate 1 is communicated with the outside to supply power for the load equipment.

Wherein, be provided with first ceramic layer 4 on the contact surface of terminal 2 and apron 1, be provided with isolation layer 5 on the contact surface of utmost point post 3 and apron 1. By arranging the first ceramic layer 4 to replace plastic parts between the terminal 2 and the cover plate 1, the thickness and the manufacturing cost of the top cover assembly are reduced, the number of parts of the top cover assembly is simplified, and the assembly efficiency of the top cover assembly is improved.

Specifically, as shown in fig. 2 and 3, the electrode post 3 includes an anode electrode post 31 and a cathode electrode post 32, two first through holes 11 are provided on the cover plate 1, the anode electrode post 31 partially passes through one of the first through holes 11 and is connected with the anode electrode terminal 21, the cathode electrode post 32 partially passes through the other first through hole 11 and is connected with the cathode electrode terminal 22, the first ceramic layer 4 includes a conductive ceramic layer 41 and an insulating ceramic layer 42, the contact surface of the anode electrode terminal 21 and the cover plate 1 is provided with the conductive ceramic layer 41, the contact surface of the cathode electrode terminal 22 and the cover plate 1 is provided with the insulating ceramic layer 42, insulation is formed between the cathode electrode terminal 22 and the cover plate 1, conduction between the cathode electrode terminal 22 and the cover plate 1 is prevented, and the conductive ceramic layer 41 is a conductive layer, so that the anode electrode terminal 21 and the cover plate 1 are electrically connected, the potential of the anode electrode is higher, and the corrosion speed of the cover plate 1 and the battery case can be reduced, and the protection of the cover plate can be realized.

Alternatively, the positive terminal 21 and the negative terminal 22 have the same shape and structure, and in the process of production, the positive terminal 21 and the negative terminal 22 can be manufactured by using the same die, so that the designs of different dies are reduced, and the production cost of the top cover assembly is reduced. The positive electrode terminal 21 and the negative electrode terminal 22 are made of different materials.

In one embodiment, the positive terminal 21 and the cover plate 1 are integrally formed, and the integrally formed structure is simpler and the manufacturing cost is lower.

In this embodiment, the isolation layer 5 is a second ceramic layer, and by setting the second ceramic layer on the pole 3, the plastic part between the pole 3 and the cover plate 1 is replaced, the thickness of the top cover assembly is further thinned, the energy density of the battery applying the top cover assembly is increased, the number of parts of the top cover assembly is reduced, and the assembly efficiency is improved. The second ceramic layer is an insulating layer, so that insulation is formed between the pole 3 and the cover plate 1, and direct conduction between the inside of the battery and the cover plate 1 is avoided.

Further, the pole 3 comprises a pole plate and a body, the body is arranged on the pole plate, the body penetrates through the first through hole 11 to be connected with the terminal 2, and a second ceramic layer is arranged on one side face, facing the cover plate 1, of the pole plate, so that insulation is achieved between the pole plate and the cover plate 1. Specifically, the electrode post 3 includes a positive electrode post 31 and a negative electrode post 32, the positive electrode post 31 is connected to the positive electrode terminal 21, and the negative electrode post 32 is connected to the negative electrode terminal 22.

In this embodiment, as shown in fig. 2 and 3, the positive electrode post 31 includes a positive electrode plate 311 and a positive electrode body 312, the positive electrode body 312 is disposed on the positive electrode plate 311, the positive electrode body 312 passes through the first through hole 11 to be connected with the positive electrode terminal 21, a second ceramic layer is disposed on the contact surface between the positive electrode plate 311 and the cover plate 1, the negative electrode post 32 includes a negative electrode plate 321 and a negative electrode body 322, the negative electrode body 322 is disposed on the negative electrode plate 321, the negative electrode body 322 passes through the first through hole 11 to be connected with the negative electrode terminal 22, and a second ceramic layer is disposed on the contact surface between the negative electrode plate 321 and the cover plate 1. The positive electrode plate 311 and the negative electrode plate 321 are respectively provided with a second ceramic layer, so that insulation is realized among the positive electrode plate 311, the negative electrode plate 321 and the top cover 1.

In one embodiment, the isolation layer 5 on the positive electrode plate 311 is a plastic piece, or the isolation layer 5 on the negative electrode plate 321 is a plastic piece.

In another embodiment, the isolating layers 5 on the positive electrode plate 311 and the negative electrode plate 321 are plastic parts.

In this embodiment, two first mounting grooves 12 are disposed on one end face of the cover plate 1 facing the terminal 2, and the positive electrode terminal 21 and the negative electrode terminal 22 are disposed in the two first mounting grooves 12 respectively, so that the positive electrode terminal 21 and the negative electrode terminal 22 are mounted on the cover plate 1, and the groove walls of the first mounting grooves 12 can limit the positive electrode terminal 21 and the negative electrode terminal 22, so as to improve the stability of the terminal 2.

Specifically, as shown in fig. 2, the end face of the positive electrode terminal 21 facing the bottom of the first mounting groove 12 is provided with the conductive ceramic layer 41, and the side face of the positive electrode terminal 21 facing the groove wall of the first mounting groove 12 is provided with the conductive ceramic layer 41, that is, the end face and the side face of the positive electrode terminal 21 inserted into the first mounting groove 12 are both provided with the conductive ceramic layer 41, the contact area between the conductive ceramic layer 41 and the cover plate 1 is increased, and the conductivity between the positive electrode terminal 21 and the cover plate 1 is increased.

In other embodiments, the conductive ceramic layer 41 may be provided only on the side of the positive electrode terminal 21 facing the groove bottom of the first mounting groove 12, or the conductive ceramic layer 41 may be provided only on the side of the positive electrode terminal 21 facing the groove wall of the first mounting groove 12.

Specifically, the end face of the negative electrode terminal 22 facing the bottom of the first mounting groove 12 is provided with an insulating ceramic layer 42, and the side face of the negative electrode terminal 22 facing the groove wall of the first mounting groove 12 is provided with an insulating ceramic layer 42. That is, the end surface and the side surface of the negative electrode terminal 22 inserted into the first mounting groove 12 are each provided with the insulating ceramic layer 42, which prevents the cap plate 1 from being directly connected to the negative electrode terminal 22, and improves the insulation between the cap plate 1 and the negative electrode terminal 22.

In other embodiments, the insulating ceramic layer 42 may be provided only on the side of the negative terminal 22 facing the bottom of the first mounting groove 12, while the negative terminal 22 is spaced from the groove wall of the first mounting groove 12 to prevent the negative terminal 22 from being electrically connected with the cap plate 1.

In one embodiment, only the first mounting groove 12 is provided at one end face of the cap plate 1 facing the terminal, and the length of the first mounting groove 12 extends in the length direction of the cap plate 1. The positive electrode terminal 21 and the negative electrode terminal 22 are provided at intervals.

In another embodiment, the positive electrode terminal 21 and the negative electrode terminal 22 may be directly provided on the side surface of the cap plate 1 without providing the first mounting groove 12.

In this embodiment, the cover plate 1 is provided with the reinforcing portion 13 protruding toward the side of the terminal 2, the first mounting groove 12 is provided on the reinforcing portion 13, and the strength of the cover plate 1 is increased by providing the reinforcing portion 13, so that local weakness due to the concave provision of the first mounting groove 12 on the cover plate 1 is avoided.

Alternatively, the reinforcing part 13 is formed by stamping the cover plate 1, so that the steps are simple, the processing is convenient, and the integral weight of the cover plate 1 is not increased by the stamped reinforcing part 13, so that the weight reduction of the battery applying the top cover assembly is ensured. In other embodiments, a reinforcing plate is provided on the cover plate 1.

In this embodiment, the thickness of the conductive ceramic layer 41 is H1, H1 is less than or equal to 1um and less than or equal to 50um. Within this range, both the weight of the positive electrode terminal 21 and the conductivity of the conductive ceramic layer 41 are ensured. The conductive ceramic layer 41 is a conductive layer, and if the thickness of the conductive ceramic layer 41 is too thin, its conductive effect is affected, and if the thickness of the conductive ceramic layer 41 is too thick, the thickness and weight of the positive electrode terminal 21 are increased, thereby affecting the weight and thickness of the top cap assembly.

In this embodiment, the thickness of the insulating ceramic layer 42 and the second ceramic layer is H2, and H2 is 1 um.ltoreq.H2.ltoreq.50um. Within this range, both the weight of the positive electrode terminal 21 and the electrode plate and the insulation property of the insulating ceramic layer 42 are ensured. The insulating ceramic layer 42 is an insulating layer, and if the thickness of the insulating ceramic layer 42 is too thin, electrons on the cap plate 1 can break through the insulating ceramic layer 42 to connect with the negative electrode terminal 22 to form a short circuit, and if the thickness of the insulating ceramic layer 42 is too thick, the weight and thickness of the negative electrode terminal 22 are increased, thereby affecting the weight and thickness of the cap assembly.

In this embodiment, the resistivity of the conductive ceramic layer 41 is R1, 50Ω.ltoreq.R1.ltoreq.10000 Ω, and the resistivity of the conductive ceramic layer 41 is low in this range so that the conductive ceramic layer 41 can be used as a semiconductive body.

In this embodiment, the resistivity of the insulating ceramic layer 42 and the second ceramic layer is R2, and R2 is not less than 1GΩ. In this range, the electrical resistivity of the insulating ceramic layer 42 and the second ceramic layer is high, so that the insulating property of the insulating ceramic layer 42 and the second ceramic layer is high.

In addition, as shown in fig. 2, the top cap assembly further includes two sealing members 6, and the two sealing members 6 are respectively sleeved outside the positive electrode body 312 and the negative electrode body 322, wherein one sealing member 6 is clamped between the positive electrode plate 311 and the cover plate 1, and the other sealing member 6 is clamped between the negative electrode plate 321 and the cover plate 1, so as to improve the sealing performance of the top cap assembly. Specifically, a side surface of the cover plate 1 facing the pole 3 is concavely provided with a second mounting groove 14, the second mounting groove 14 communicates with the first through hole 11, and the sealing member 6 is disposed in the second mounting groove 14. By providing the second mounting groove 14 to limit the sealing member 6, the mounting stability of the sealing member 6 is improved.

Optionally, the sealing member 6 is a sealing ring, and the sealing ring is annular, so that the installation is convenient.

Specifically, the cover plate 1 is concavely provided with a third mounting groove towards one side face of the pole 3, two third mounting grooves are arranged at intervals, the positive pole plate 311 and the negative pole plate 321 are respectively arranged in the third mounting grooves, and the positive pole plate 311 and the negative pole plate 321 can be limited by arranging the third mounting grooves, so that the assembly stability of the top cover assembly is improved.

In this embodiment, the body is riveted to the terminal. Specifically, the terminal runs through and is provided with the second through-hole, and the one end of keeping away from the polar plate of body inlays and establishes in the second through-hole.

Specifically, before the terminal 2 and the pole 3 are provided with the ceramic layer, the contact surface between the positive terminal 21 and the cover plate 1, the contact surface between the negative terminal 22 and the cover plate 1, the contact surface between the negative electrode plate 321 and the cover plate 1, and the contact surface between the positive electrode plate 311 and the cover plate 1 are roughened, and the ceramic layer is provided on the roughened surface, so as to improve the stability of the ceramic layer.

Alternatively, the roughening process is not limited to shot peening and laser lamp processes.

Preferably, the roughness ranges from 1um < ra <32um.

The specific assembly steps of the top cover assembly comprise S1, assembling a positive terminal 21 and a negative terminal 22 in a first mounting groove 12 of a cover plate 1;

s2, respectively sleeving the two sealing pieces 6 outside the positive electrode body 312 and the negative electrode body 322;

s3, the positive electrode body 312 penetrates through one of the first through holes 11 to be connected with the positive electrode terminal 21, the negative electrode body 322 penetrates through the other first through hole 11 to be connected with the negative electrode terminal 22, and the assembly of the top cover assembly is completed through the steps, so that parts are fewer, and the assembly efficiency is high.

Preferably, the positive electrode body 312 and the positive electrode terminal 21 are not limited to riveting or laser welding; the connection between the negative electrode body 322 and the negative electrode terminal 22 is not limited to riveting or laser welding.

The utility model also discloses a battery which comprises a shell, an electric core and the top cover component of any embodiment, wherein the electric core is arranged in the shell, and the top cover component is arranged at the opening of the shell. This top cap subassembly is through setting up ceramic layer 4 on the terminal to replace traditional plastic spare, reduced thickness and manufacturing cost of this top cap subassembly, and simplified the part quantity of top cap subassembly, improved this top cap subassembly assembly efficiency, and because this top cap subassembly's thickness is thinner, can improve the volume ratio of electric core in the casing, thereby increased the ability density of this battery.

In the description herein, it should be understood that the terms "upper," "lower," and the like are used for convenience in description and simplicity of operation only, and are not necessarily indicative or implying any particular orientation, configuration or operation of such apparatus or elements herein, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the term "an embodiment" or the like means 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. The utility model provides a top cap subassembly, includes apron, terminal and utmost point post, the terminal with the utmost point post sets up respectively the relative both sides of apron, the apron runs through and is provided with first through-hole, utmost point post part passes first through-hole with the terminal is connected, its characterized in that, the terminal with be provided with first ceramic layer on the contact surface of apron, the utmost point post with be provided with the isolation layer on the contact surface of apron.

2. The header assembly of claim 1, wherein the barrier layer is a second ceramic layer or a plastic member.

3. The header assembly of claim 2, wherein the terminals include a positive terminal and a negative terminal, the positive terminal including a positive terminal and a negative terminal, the cover plate being provided with at least two of the first through holes, the positive terminal portion being connected to the positive terminal through one of the first through holes, the negative terminal portion being connected to the negative terminal through the other of the first through holes, the first ceramic layer including a conductive ceramic layer and an insulating ceramic layer, a contact surface of the positive terminal with the cover plate being provided with the conductive ceramic layer, and a contact surface of the negative terminal with the cover plate being provided with the insulating ceramic layer.

4. The header assembly of claim 3, wherein a side of the cover plate facing the terminal is recessed with a first mounting groove, the first mounting groove being in communication with the first through hole, at least a portion of the positive terminal being disposed within the first mounting groove;

5. The header assembly of claim 3, wherein a side of the cover plate facing the terminal is recessed with a first mounting groove, the first mounting groove being in communication with the first through hole, at least a portion of the negative terminal being disposed within the first mounting groove;

6. The header assembly of claim 3, wherein the conductive ceramic layer has a resistivity of R1, 50 Ω -R1-10000 Ω; and/or the number of the groups of groups,

7. The header assembly of any one of claims 1-6, wherein the post comprises a plate and a body disposed on the plate, the body being connected to the terminal through the first through hole, a side of the plate facing the cover plate being provided with the spacer layer.

8. The header assembly of any one of claims 1-6, wherein the first ceramic layer is disposed on the terminals by thermal spraying or bonding.

9. The header assembly of any one of claims 1-6, wherein the first ceramic layer has a thickness H1,1um ∈h1 ∈50um.

10. A battery comprising a housing and a cell disposed within the housing, comprising the cap assembly of any one of claims 1-9 disposed at an opening of the housing.