CN220914395U

CN220914395U - High-safety battery cell top cover structure and battery cell

Info

Publication number: CN220914395U
Application number: CN202322357123.8U
Authority: CN
Inventors: 朱坤庆
Original assignee: Guangzhou Rongjie Energy Technology Co ltd
Current assignee: Guangzhou Rongjie Energy Technology Co ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2024-05-07
Anticipated expiration: 2033-08-31

Abstract

The utility model belongs to the technical field of battery cells, and particularly relates to a high-safety battery cell top cover structure and a battery cell; wherein, high safe electric core top cap structure includes: the cover plate comprises a supporting plate and a metal plate; at least one mounting hole is formed in the supporting plate; the metal plate cover is arranged at the upper end of the supporting plate, and the mounting hole penetrates through the metal plate; at least one composite pole, which is arranged in the mounting hole, passes through the mounting hole and is connected with the metal plate; wherein, a channel is arranged in the composite pole; a separator; the separator is arranged at the lower end of the supporting plate, and the separator is connected with the channel. The utility model can improve the convenience of assembling the composite pole and the separation frame, and greatly reduces the complexity of assembly.

Description

High-safety battery cell top cover structure and battery cell

Technical Field

The utility model belongs to the technical field of battery cells, and particularly relates to a high-safety battery cell top cover structure and a battery cell.

Background

The lithium ion battery is a secondary battery, mainly depends on lithium ions to move between an anode and a cathode for discharging, and is widely applied to digital products, unmanned aerial vehicles and electric vehicles along with the continuous improvement of the technology level of the high-speed development of society, and the top cover component for the lithium ion battery core is an important part of the lithium ion battery.

However, the side between most of the existing battery cell bodies and the top cover structure are welded and assembled into a whole, and then are lifted into the shell; in the process, the technical requirements of operators are too high in the side welding operation, and the problem that the negative pole is easy to fall off in the friction welding process; and the resulting structure has poor stability.

Disclosure of utility model

The utility model aims at: aiming at the defects of the prior art, a high-safety battery cell top cover structure and a battery cell are provided, and the aim of improving the assembly convenience is achieved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a high safety cell cap structure comprising:

The cover plate comprises a supporting plate and a metal plate; at least one mounting hole is formed in the supporting plate; the metal plate cover is arranged at the upper end of the supporting plate, and the mounting hole penetrates through the metal plate;

At least one composite pole, which is arranged in the mounting hole, passes through the mounting hole and is connected with the metal plate; wherein, a channel is arranged in the composite pole;

a separator; the separator is arranged at the lower end of the supporting plate, and the separator is connected with the channel.

Preferably, the composite pole comprises a first composite layer and a second composite layer; the first composite layer is arranged on the inner side of the second composite layer; and the channel passes through the first composite layer and the second composite layer; the second composite layer is connected to the separator.

Preferably, the first composite layer is a copper material layer; the second composite layer is a copper material layer;

And/or, the first composite layer is an aluminum material layer; the second composite layer is a copper material layer.

Preferably, the composite pole comprises a first horizontal part, a vertical part and a second horizontal part which are sequentially connected; and the first horizontal portion, the vertical portion, and the second horizontal portion form the channel therebetween.

Preferably, the metal plate is connected to a side end face of the vertical portion;

Or a mounting groove is arranged between the vertical part and the second horizontal part; the metal plate is connected to the mounting groove.

Preferably, the cover plate includes a support plate and an insulating layer, and the insulating layer is connected to the support plate;

Wherein the insulating layer is located between the support plate and the composite pole and/or between the support plate and the separator.

Preferably, the partition frame includes a partition plate and a bus bar; the busbar is arranged on the upper surface of the partition plate; the bus is connected to the channel; and the lugs of the battery cell body penetrate through the separation plate and are connected to the bus bars.

Preferably, the bus bar includes a bus plate and a connection protrusion; the connection protrusion is connected to an end face of the bus plate, and the connection protrusion is connected to an inside of the passage; the bus plate abuts against the metal plate.

Preferably, a buffer groove is arranged in the connecting convex part.

The utility model also discloses a battery cell, which comprises the high-safety battery cell top cover structure, an isolation film, a shell and the battery cell body; the battery cell body is connected to the inside of the shell; the cover plate is connected to the opening of the shell; the separation frame is connected between the cover plate and the battery cell body; the isolating film is positioned between the cover plate and the separation frame and between the battery cell body and the shell.

The composite pole with the channel is adopted in the technical scheme, so that the composite pole and the separation frame can be assembled into a whole from the inside of the channel, and then the composite pole is combined and can be assembled into the mounting hole conveniently, thereby improving the assembly convenience of the composite pole and the separation frame, greatly reducing the assembly complexity, avoiding the assembly falling risk of the composite pole, ensuring the structural stability of the top cover structure and improving the safety performance of the top cover structure; besides, the assembly stability of the composite pole can be further improved through the assembly of the composite pole and the metal plate, so that the structural stability of the top cover structure is improved.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to fig. 1 to 7.

FIG. 1 is a schematic diagram of a high-safety top cap structure of a battery cell according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a high safety top cap structure of a battery cell according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a high-safety cell cap structure according to one embodiment of the present utility model;

FIG. 4 is an enlarged view of a portion of a high-safety top cap structure of a battery cell according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a composite pole with a high-safety top cap structure according to an embodiment of the present utility model;

Fig. 6 is a schematic structural diagram of a composite pole of a high-safety battery cell top cover structure according to another embodiment of the present utility model;

Fig. 7 is an exploded view of a cell according to an embodiment of the present utility model.

In the figure: 1-a cover plate; 11-explosion-proof holes; 12-a liquid injection hole; 101-a support plate; 102-an insulating layer; 13-insulating mounting blocks; 14-sealing rings; 15-a metal plate; 2-a composite pole; 21-channel; 201-positive electrode column; 202-a negative electrode column; 203-a first composite layer; 204-a second composite layer; 205-a first horizontal portion; 206-vertical; 207-a second horizontal section; 208-mounting groove; 3-sealing blocks; 4-a separation frame; 41-dividing plates; 411-mounting through holes; 42-bus bars; 421-a busbar; 422-connecting protrusions; 423-buffer tank; 5-an isolation film; 6-a housing; 7-a battery cell body; 71-tab.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is merely a high-security cell top cover structure and a cell description association relationship of the associated objects, which indicates that three relationships may exist, for example, a and/or B may indicate: a alone, both a and B, and a plurality of cases alone. In addition, the character "/" herein generally indicates that the front-back associated object is a highly safe cell top cover structure and cell or relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may 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 embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 7, but the present utility model is not limited thereto.

As shown in fig. 1 and 2 and fig. 4 and 7, in one embodiment of the present utility model, the high safety cell cap structure; comprises a cover plate 1, a composite pole 2 and a separation frame 4; the cover plate 1 includes a support plate 101 and a metal plate 15; the supporting plate 101 is internally provided with a mounting hole; a metal plate 15 is provided to cover the upper end of the support plate 101, and the mounting hole penetrates through the metal plate; the composite pole 2 is arranged in the mounting hole, and the composite pole 2 passes through the mounting hole and is connected with the metal plate 15; wherein, a channel 21 is arranged in the composite pole 2; the separation frame 4 is connected to the lower end of the support plate 101, the separation frame 4 is connected to the channel 21, and the separation frame 4 is used for being connected with the tab 71 of the cell body 7.

According to the technical scheme, the composite pole with the channel is adopted to assemble the composite pole and the separation frame into a whole from the channel, and then the composite pole is combined to be assembled into the mounting hole conveniently, so that the assembling convenience of the composite pole and the separation frame can be improved, the assembling complexity is greatly reduced, the assembling and falling risk of the composite pole can be avoided, the structural stability of the top cover structure can be further ensured, and the safety performance of the top cover structure is improved; besides, the assembly stability of the composite pole can be further improved through the assembly of the composite pole and the metal plate, so that the structural stability of the top cover structure is improved.

During assembly, the battery cell body 7 and the separation frame 4 are assembled into a whole; the cover plate 1, the composite pole 2 and the separation frame 4 are assembled again, wherein the separation frame 4 is clamped at the lower end of the supporting plate 101: firstly, inserting the composite pole 2 into the mounting hole; the metal plate 15 is welded with the side end of the composite pole 2 into a whole from the inner side end surface of the cover plate 1; then the separation frame 4 with the battery core body 7 is assembled below the metal plate 15 and the composite pole 2; finally, the composite pole 2 and the separating frame 4 are welded into a whole by extending into the welding head from the channel 21; therefore, the assembly complexity can be greatly reduced, and the assembly convenience of the composite pole and the separation frame is improved.

Specifically, in some embodiments, as shown in fig. 1, a sealing block 3 is provided within the composite pole 2; the sealing block 3 is connected to the inlet of the channel 21. In some embodiments, after the composite pole 2 is assembled with the separator 4, the sealing block 3 is welded and sealed at the entrance of the channel 21. The separation frame 4 can be separated from the outside through the sealing block 3, so that the damage caused by corrosion and pollution of external substances is avoided; the flatness of the composite pole 2 can be improved, and the rugged parts of the composite pole 2 can be reduced; in addition, the assembly surface of the composite pole 2 and other external assembly components can be enlarged, and the assembly convenience and stability are improved.

Wherein, in some embodiments, as shown in fig. 2 and 3, the composite post 2 comprises a positive post 201 and a negative post 202; the positive electrode post 201 and the negative electrode post 202 are respectively provided in two corresponding mounting holes on the support plate 101.

In some embodiments, the metal plate 15 is an aluminum metal plate, and the bottom of the metal plate 15 is further provided with a connection groove, and the aluminum metal plate is connected to the connection groove. Through the location limiting displacement of spread groove, can improve the assembly stability of aluminium metal sheet to improve the stability of top cap structure.

Specifically, in some embodiments, as shown in fig. 2 and 4, the composite pole 2 includes a first composite layer 203 and a second composite layer 204; the first composite layer 203 is disposed inside the second composite layer 204; and the channel 21 passes through the first composite layer 203 and the second composite layer 204 in sequence; the second composite layer 204 is connected to the spacer 4. Wherein the first composite layer 203 and the second composite layer 204 are integrally formed by stamping. Through the first composite layer 203 and the second composite layer 204 formed by stamping, the convenience of production and processing can be improved, and the structural stability of the composite pole 2 can also be ensured.

Specifically, in some embodiments, as shown in fig. 3, when the composite post 2 is a negative post 202; the first composite layer 203 is a copper material layer; the second composite layer 204 is a copper material layer. That is, the first composite layer 203 and the second composite layer 204 may be a single composite layer, and the material is a composite layer of copper material; and the composite pole 2 is; therefore, the composite pole 2 can be connected with the corresponding polar lug on the separation frame 4, so that the normal use of the top cover structure can be realized. Besides, in the assembly process, the copper material layer and the copper part of the separation frame 4 can be mutually welded, so that the stability of welding assembly of the same material is realized, the phenomena of powder and the like generated by welding among different materials are avoided, the electric connection performance between the corresponding polar lug on the separation frame 4 and the negative pole column 202 can be ensured, and the use safety and stability are improved.

Specifically, in some embodiments, as shown in fig. 3, when the composite electrode post 2 is the positive electrode post 201, the first composite layer 203 is an aluminum material layer; the second composite layer 204 is a copper material layer. The hardness and strength of the composite pole can be improved through the mutual combination of the aluminum material layer and the copper material layer, so that the structural stability is improved.

Specifically, in some embodiments, as shown in fig. 4, a sealing ring 14 is provided between the composite pole 2 and the cover plate 1; and the seal ring 14 is disposed in the mounting hole and above the metal plate 15. Wherein, the sealing ring 14 is a rubber sealing ring. The sealing action of the sealing ring 14 can further isolate the inner side and the outer side of the cover plate 1, so that the use safety of the top cover structure can be improved.

Specifically, in some embodiments, as shown in fig. 5 and 6, the composite pole 2 includes a first horizontal portion 205, a vertical portion 206, and a second horizontal portion 207 that are sequentially connected as one body; and the first horizontal portion 205, the vertical portion 206, and the second horizontal portion 207 form the channel 21. Wherein, in some embodiments, the first horizontal portion 205 is an L-shaped or in-line first horizontal portion; the vertical portion 206 is a straight vertical portion; the second horizontal portion 207 is a straight second horizontal portion; the L-shaped or straight-shaped first horizontal part, the straight-shaped vertical part and the straight-shaped second horizontal part form a stepped channel 21 which gradually increases from the inlet to the outlet of the channel 21; the first horizontal portion 205, the vertical portion 206, and the second horizontal portion 207 are integrally fixed and molded. The stepped channel 21 can ensure the assembly stability between the composite pole 2 and the cover plate 1, so that the use safety of the cover plate structure is improved.

Specifically, in some of the embodiments, as shown in fig. 5, the metal plate 15 is attached to the side end face of the vertical portion 206; wherein the metal plate 15 is welded to the vertical portion 206 as one body. By welding the bottom of the metal plate 15 to the bottom of the vertical portion 206, the stability of the assembly between the composite pole 2 and the metal plate 15 can be improved, thereby improving the use safety of the top cover structure.

Specifically, in other embodiments, as shown in fig. 6, a mounting groove 208 is provided between the vertical portion 206 and the second horizontal portion 207; the metal plate 15 is connected to the mounting groove 208. That is, the metal plate 15 is welded into the mounting groove 208, so that the welding position and the position of the sealing ring 14 can be staggered, and the damage caused by the direct influence of the welding temperature and other factors on the sealing ring 14 can be avoided, so that the use safety of the top cover structure can be further improved.

Specifically, in some embodiments, the cover plate 1 includes a support plate 101 and an insulating layer 102, the insulating layer 102 being connected to the support plate 101; and an insulating layer 102 is located between the support plate 101 and the composite pole 2 and/or between the support plate 101 and the separator 4. As shown in fig. 1 and 2, the insulating layer 102 is a plastic sheet, and the number of plastic sheets is at least two and is respectively connected to the upper and lower surfaces of the supporting plate 101. The supporting plate 101 can be separated from the separation frame 4 and the supporting plate 101 from the outside through the plastic sheet, so that the supporting plate 101 is prevented from being corroded or short-circuited; thereby improving the safety of use. Wherein the insulating layer 102 is annular plastic, and the annular plastic is connected between the supporting plate 101 and the composite pole 2; that is, the annular plastics include a negative annular plastic and a positive annular plastic; the positive annular plastic is positioned between the negative pole column 202 and the supporting plate 101; the negative annular plastic is located between the positive electrode column 201 and the support plate 101. This structure can avoid the occurrence of short circuit or the like between the support plate 101 and the composite pole 2, thereby improving the safety of use.

In some embodiments, as shown in fig. 1, the cover plate 1 is provided with a explosion-proof hole 11, and the inside of the explosion-proof hole 11 is used for installing an explosion-proof valve; the opening of the explosion-proof hole 11 is used for installing an explosion-proof membrane. The explosion-proof hole 11 is arranged, so that the pressure in the battery cell with abnormal use can be quickly adjusted and relieved, and the use safety is improved; and then through the separation protection effect of the explosion-proof membrane on the explosion-proof valve, the corrosion damage of foreign matters to the explosion-proof valve can be avoided, so that the service life of the explosion-proof valve is prolonged. Wherein, the cover plate 1 is also provided with a liquid injection hole 12; the electrolyte injection hole 12 is used for injecting electrolyte.

Specifically, in some embodiments, as shown in fig. 2 and 3, the partition frame 4 includes a partition plate 41 and a bus bar 42; the number of the bus bars 42 is at least two, and is provided on the upper surface of the partition plate 41; the bus bar 42 is connected to the channel 21; and the tab 71 of the cell body 7 passes through the partition plate 41 and is connected to the bus bar 42. As shown in fig. 2, the partition plate 41 is provided with a mounting through hole 411, and the busbar 42 is provided with a through hole corresponding to the mounting through hole 411. That is, the tab 71 of the battery cell body 7 sequentially passes through the mounting through hole 411, the through hole and is connected to the upper surface of the busbar 42; and the tab 71 is connected to the metal plate 15 and the composite pole 2, respectively. Through the assembly of separating frame 4 and compound utmost point post 2 and utmost point ear and separating frame 4 installation, the naked electric core of significantly reduced is connected the space with the top cap, has improved electric core inner space utilization greatly.

Specifically, in some embodiments, as shown in fig. 2 and 3, the bus bar 42 includes a bus plate 421 and a connection protrusion 422; the connection protrusion 422 is connected to an end surface of the bus plate 421, and the connection protrusion 422 is connected to the inside of the passage 21; the busbar 421 abuts the metal plate 15. During assembly, the welding head extends into the channel 21, and the connecting convex part 422 and the composite pole 2 are welded and assembled, so that the convenience and stability of assembly are improved.

Specifically, in some embodiments, a buffer groove 423 is provided within the connection protrusion 422. In the casting molding process, the casting amount is the same, so that the thickness or the height of the connecting convex part 422 in the non-buffer groove 423 area can be increased, the welding stability between the connecting convex part 422 and the composite pole 2 can be further ensured, and the bus plate 421 is prevented from being damaged due to the fact that welding passes through the connecting convex part 422; the structure can improve the use safety of the top cover structure.

The utility model also provides a battery cell, as shown in fig. 7, which includes a high-safety battery cell top cover structure, and the specific structure of the high-safety battery cell top cover structure refers to the above embodiment.

As shown in fig. 7, the battery cell further includes an insulation film 5, a housing 6 and a battery cell body 7; the battery cell body 7 is connected to the inside of the shell 6; the cover plate 1 is connected to the opening of the shell 6; the separation frame 4 is connected between the cover plate 1 and the battery cell body 7; the isolating film 5 is located between the cover plate 1 and the partition frame 4 and between the cell body 7 and the housing 6.

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 embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims

1. A high safe electric core top cap structure, its characterized in that: comprising the following steps:

2. The high-safety cell cap structure of claim 1, wherein: the composite pole comprises a first composite layer and a second composite layer; the first composite layer is arranged on the inner side of the second composite layer; and the channel passes through the first composite layer and the second composite layer; the second composite layer is connected to the separator.

3. The high-safety cell cap structure of claim 2, wherein: the first composite layer is a copper material layer; the second composite layer is a copper material layer;

4. A high safety cell cap structure according to any one of claims 1 to 3, wherein: the composite pole comprises a first horizontal part, a vertical part and a second horizontal part which are sequentially connected; and the first horizontal portion, the vertical portion, and the second horizontal portion form the channel therebetween.

5. The high-safety cell cap structure of claim 4, wherein: the metal plate is connected to the side end face of the vertical part;

6. The high-safety cell cap structure of claim 1, wherein: the cover plate comprises a supporting plate and an insulating layer, and the insulating layer is connected to the supporting plate;

7. The high-safety cell cap structure of claim 1, wherein: the partition frame comprises a partition plate and a bus bar; the busbar is arranged on the upper surface of the partition plate; the bus is connected to the channel; and the lugs of the battery cell body penetrate through the separation plate and are connected to the bus bars.

8. The high-safety cell cap structure of claim 7, wherein: the busbar comprises a busbar plate and a connecting convex part; the connection protrusion is connected to an end face of the bus plate, and the connection protrusion is connected to an inside of the passage; the bus plate abuts against the metal plate.

9. The high-safety cell cap structure of claim 8, wherein: and a buffer groove is arranged in the connecting convex part.

10. The utility model provides an electric core which characterized in that: a high safety cell cap structure comprising any one of the above claims 1 to 9 and an insulating film, a housing and the cell body; the battery cell body is connected to the inside of the shell; the cover plate is connected to the opening of the shell; the separation frame is connected between the cover plate and the battery cell body; the isolating film is positioned between the cover plate and the separation frame and between the battery cell body and the shell.