CN220627964U

CN220627964U - Battery cell

Info

Publication number: CN220627964U
Application number: CN202322331339.7U
Authority: CN
Inventors: 王世历
Original assignee: Chongqing Talent New Energy Co Ltd
Current assignee: Chongqing Talent New Energy Co Ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2024-03-19
Anticipated expiration: 2033-08-29

Abstract

The utility model discloses a battery, which belongs to the technical field of batteries and comprises a battery core, a shell structure and a vacuum diversion structure, wherein the shell structure is formed by an aluminum plastic film, and the battery core is arranged in the shell structure; the vacuum flow guiding structure is arranged at one side of the shell structure and is partially arranged in the shell structure, and the vacuum flow guiding structure is configured to be connected with the vacuumizing device so as to vacuumize the shell structure, so that the shell structure is vacuum-coated with the battery cell. Through the evacuation to shell structure, make shell structure and electric core laminate completely, guarantee electric core planarization and thickness uniformity, realized the electric core production in-process and exempt from to wash the hole, simplified traditional preparation process, improved electric core preparation and production efficiency, avoided the problem that the plastic-aluminum membrane corner became invalid because of punching the hole brings, improved electric core security performance.

Description

Battery cell

Technical Field

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

Background

Current secondary battery packaging methods include soft package packaging and hard case packaging. The soft package is to use an aluminum plastic film as a cell package and an outer coating material, to use a process of hot pressing and pit punching of the aluminum plastic film to punch pits and to mold the aluminum plastic film, and then to use a heat sealing process to package the dry cell. The hard shell packaging is to use aluminum or steel metal material as the cell packaging and outer coating material, prepare the hard shell by extrusion molding process, and then package the cell by laser sealing process. In summary, the outer packaging materials of the soft package and the hard shell battery core are required to be subjected to a pit punching or compression molding process to prepare the outer package.

At present, an aluminum plastic film pit punching process is used as an indispensable procedure for producing the soft-package battery, and is generally applied to the preparation of the soft-package battery. However, the pit punching process of the aluminum plastic film has the following technical defects. Firstly, the aluminum plastic film is adopted to punch pits and then the dry battery cells are packaged, so that the production efficiency of the soft package battery cells is reduced; secondly, the perfect fit of the battery core and the shell is difficult to ensure in the pit punching process of the aluminum plastic film, so that the pit punching depth of the shell is not matched with the battery core, the consistency is poor, and the problems that the battery core is in poor contact with the shell due to the fact that the shell is too deep and the battery core is in top film due to the fact that the pit punching is insufficient are solved; thirdly, the existing aluminum plastic film adopts a die to punch pits, corners of the aluminum plastic film are easy to crack due to mismatching of the die and the aluminum plastic film and difficult control of technological parameters, and potential safety risks are caused in the preparation process of the battery cell.

Disclosure of Invention

The utility model aims to provide a battery to solve the technical problems of low production efficiency, poor consistency and low safety of a battery core in the prior art.

The technical scheme adopted by the utility model is as follows:

a battery, comprising:

a battery cell;

the shell structure is formed by an aluminum plastic film, and the battery cell is arranged in the shell structure;

the vacuum flow guide structure is arranged on one side of the shell structure and is partially arranged in the shell structure, and the vacuum flow guide structure is configured to be connected with a vacuumizing device so as to vacuumize the shell structure, so that the shell structure is used for vacuum coating of the battery cell.

The vacuum diversion structure comprises a diversion pipe, one end of the diversion pipe is arranged in the shell structure, and the other end of the diversion pipe can be communicated with the vacuumizing device.

The vacuum diversion structure further comprises an adhesion layer, wherein the adhesion layer is fixedly connected to the diversion pipe, and the adhesion layer is connected to the heat sealing position of the shell structure in a hot melting mode.

The adhesion layer is provided with two layers, the two layers of adhesion layers are symmetrically fixedly connected to the guide pipe, and the two layers of adhesion layers are mutually connected in a hot melting mode.

The vacuum diversion structure further comprises a buffer structural member, and the buffer structural member can penetrate through the diversion pipe and support a channel in the diversion pipe.

Wherein, the buffer structure is wire or silica gel strip.

The honeycomb duct is located one end in the shell structure and is arranged at intervals with the battery cell.

The vacuum diversion structure further comprises a plug, the plug is detachably connected with one end of the diversion pipe, which is located outside the shell structure, and the plug can seal the diversion pipe.

The lug part of the battery cell extends out of the shell structure, and the vacuum flow guiding structure is arranged on one side of the shell structure, which does not extend out of the lug.

Wherein, vacuum water conservancy diversion structure is provided with two at least groups.

The utility model has the beneficial effects that:

according to the battery provided by the utility model, the aluminum plastic film forms the shell structure for accommodating the battery cell after heat sealing, the vacuum flow guide structure is arranged on one side edge of the shell structure and is partially arranged in the shell structure, and the vacuum flow guide structure is configured to be connected with the vacuumizing device so as to vacuumize the shell structure, so that the shell structure vacuum-coats the battery cell. Through the evacuation to shell structure, make shell structure and electric core laminate completely, guarantee electric core planarization and thickness uniformity, realized the electric core production in-process and exempt from to wash the hole, simplified traditional preparation process, improved electric core preparation and production efficiency, avoided the problem that the plastic-aluminum membrane corner became invalid because of punching the hole brings, improved electric core security performance.

Drawings

Fig. 1 is a schematic view of a battery according to a first embodiment of the present utility model;

FIG. 2 is a schematic view of a shell structure, a flow guiding pipe and an adhesion layer according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a flow guide and an adhesion layer according to a first embodiment of the present utility model;

FIG. 4 is a schematic view of a flow conduit, an adhesion layer and a buffer structure according to a first embodiment of the present utility model;

FIG. 5 is a schematic view of another battery according to a first embodiment of the present utility model;

FIG. 6 is a schematic illustration of the completion of the battery package provided in FIG. 1;

fig. 7 is a schematic view of a battery according to a second embodiment of the present utility model;

fig. 8 is a schematic view of another battery according to the second embodiment of the present utility model;

FIG. 9 is a schematic illustration of the completion of the battery package provided in FIG. 7;

fig. 10 is a schematic view of the completion of the battery package provided in fig. 8.

In the figure:

10. a battery cell; 11. a tab;

20. a housing structure;

30. a vacuum flow guiding structure; 31. a flow guiding pipe; 32. a plug; 33. an adhesive layer; 34. and the buffer structural member.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting 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.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Example 1

Referring to fig. 1 to 4, the present embodiment provides a battery, including a battery cell 10, a housing structure 20 and a vacuum diversion structure 30, wherein an aluminum plastic film forms the housing structure 20 for accommodating the battery cell 10 after heat sealing, the vacuum diversion structure 30 is disposed at one side of the housing structure 20 and partially disposed in the housing structure 20, and the vacuum diversion structure 30 is configured to be connected with a vacuumizing device to vacuumize the housing structure 20, so that the housing structure 20 vacuum-coats the battery cell 10. Through the evacuation to shell structure 20, make shell structure 20 and electric core 10 laminate completely, guarantee electric core 10 planarization and thickness uniformity, realized the no-blow hole in the electric core 10 production process, simplified traditional preparation process, improved electric core 10 preparation and production efficiency, avoided the problem that plastic-aluminum membrane corner became invalid because of punching the hole brings, improved electric core 10 security performance.

The vacuumizing device is of an existing structure and is not described herein.

The vacuum diversion structure 30 comprises a diversion pipe 31, one end of the diversion pipe 31 is arranged in the shell structure 20, and the other end of the diversion pipe 31 can be communicated with a vacuumizing device. When the flow guide pipe 31 is connected with the vacuumizing device, the shell structure 20 can be vacuumized, so that the battery cell 10 and the shell structure 20 are completely attached, after the preset vacuum degree is reached, the vacuumizing device is removed, and the flow guide pipe 31 is sealed with the outside.

After the evacuation is completed, the flow guide tube 31 needs to be blocked. In some embodiments, the vacuum flow guiding structure 30 further includes a plug 32, where the plug 32 is detachably connected to an end of the flow guiding tube 31 located outside the housing structure 20, and the plug 32 can block the flow guiding tube 31. The plug 32 may be a rubber head. In other embodiments, a valve may be provided on the draft tube 31, the valve being capable of opening or closing the draft tube 31.

In general, the draft tube 31 is disposed in the heat-seal area during the process of heat-sealing the plastic-aluminum film to form the case structure 20. Because the plastic-aluminum film is thin, the plastic layer of the draft tube 31 and the plastic layer of the plastic-aluminum film may be fused during the heat sealing process.

The vacuum guiding structure 30 further comprises an adhesive layer 33, wherein the adhesive layer 33 is fixedly connected to the guiding tube 31, and the adhesive layer 33 is connected to the heat sealing position of the housing structure 20 in a hot-melt manner. The adhesive layer 33 is arranged to avoid fusion of the honeycomb duct 31 and the aluminum plastic film during the heat sealing process. If the adhesive layer 33 is not used, fusion of the plastic layer of the draft tube 31 and the plastic layer of the plastic-aluminum film may occur during the heat sealing process due to the thinner plastic-aluminum film, and the plastic-aluminum film is damaged to cause package failure. Therefore, the adhesion layer 33 is used for realizing the indirect connection between the flow guide pipe 31 and the shell structure 20, so that the shell structure 20 is not damaged on one hand, and the packaging failure is avoided; on the other hand, the honeycomb duct 31 can be protected from being damaged by hot pressing, and normal vacuumizing can be ensured.

The adhesion layer 33 and the draft tube 31 are compositely connected by a hot-melt method. In some embodiments, the adhesion layer 33 is provided with two layers, the two adhesion layers 33 are symmetrically and fixedly connected to the flow guiding tube 31, and the two adhesion layers 33 are mutually connected by hot melting, so that the processing and the production are facilitated. In other embodiments, the adhesive layer 33 is provided with a layer, the adhesive layer 33 wraps around the periphery of the flow guiding tube 31, and two ends of the adhesive layer 33 are connected by hot melting.

The distance between the end of the flow guide 31 located in the housing structure 20 and the adhesion layer 33 is a composite distance, and the composite distance is shown as L in fig. 2, where the composite distance needs to be determined so that the flow guide 31 does not contact the battery cell 10. And in particular, may be determined based on the heat seal location of the cell 10 and the housing structure 20. That is, the end of the flow guiding tube 31 in the housing structure 20 is spaced from the battery cell 10, so as to avoid the influence of the battery cell 10 on the vacuum pumping. Specifically, along the extending direction of the flow guide 31, the end of the flow guide 31 may face the battery cell 10, or the battery cell 10 may be located at one side of the axis of the flow guide 31.

The width of the adhesive layer 33 needs to be determined by combining the sealing width of the package, and the thickness of the adhesive layer 33 needs to be determined according to the thickness of the glue layer of the aluminum plastic film and the thickness of the pipe wall of the flow guiding pipe 31. In theory, the thickness of the adhesive layer 33 may be smaller as the thickness of the adhesive layer of the plastic-aluminum film and the wall of the draft tube 31 are larger, and the thickness of the adhesive layer 33 is generally the same as the thickness of the adhesive layer of the plastic-aluminum film.

The battery cell 10 comprises a tab 11, and a portion of the tab 11 of the battery cell 10 extends out of the housing structure 20. The two tabs 11 are respectively a positive tab and a negative tab. The two electrode lugs 11 can be positioned on the same side of the battery cell 10, namely, the packaging mode of the same side electrode lug is adopted; the two tabs 11 may also be distributed on two opposite sides of the battery cell 10, that is, in a packaging manner of different-side tab.

The vacuum flow guiding structure 30 is disposed on one side of the housing structure 20, which does not extend out of the tab 11, and the layout is reasonable, so as to prevent the vacuum flow guiding structure 30 from interfering with the tab 11. Specifically, the housing structure 20 has a heat sealing region including a top sealing region where the tab 11 is disposed and a side sealing region where the vacuum flow guiding structure 30 is disposed in a normal case.

In this embodiment, the vacuum flow guiding structure 30 is provided with a set. As shown in fig. 1, two tabs 11 may be located on the same side, which is a top sealing area, and the vacuum flow guiding structure 30 is disposed on any one of the remaining three sides. For reasonable layout, the side edge of the two lugs 11 is opposite to the side edge of the vacuum flow guiding structure 30. As shown in fig. 5, two tabs 11 may be located on opposite sides, and the two sides are top sealing areas, and the vacuum flow guiding structure 30 is disposed on any one of the other two sides.

After the honeycomb duct 31 and the adhesive layer 33 are combined, the welded cell 10 and the case structure 20 are first top-sealed and side-sealed. If the same side tab packaging mode is adopted, after the top sealing of the battery cell 10 is completed, one side edge of the side edge sealing of the battery cell 10 and the honeycomb duct 31 provided with the adhesion layer 33 are required to be packaged.

The vacuum flow guiding structure 30 further comprises a buffer structural member 34, and the buffer structural member 34 can penetrate through the flow guiding pipe 31 and support a channel in the flow guiding pipe 31. The buffer structural member 34 is arranged to support the channel in the flow guide pipe 31, so that the flow guide pipe 31 and the shell structure 20 are prevented from being bonded to form a sealing structure in the heat sealing process.

The buffer structural member 34 is detachably connected with the flow guide pipe 31, and after the flow guide pipe 31 is packaged, the buffer structural member 34 is detached. The material of the buffer structure 34 is selected so that it is not affected by the heat sealing temperature, i.e. it does not melt during heat sealing. The cushioning structure 34 may be a wire or a strip of silicone.

Since the buffer structure 34 is required to support the channel in the flow guide 31, the flow guide 31 is prevented from adhering to the housing structure 20 during the heat sealing process, and the buffer structure 34 is inserted into the flow guide 31 from the outside of the housing structure 20, the buffer structure 34 itself needs to have a certain length, and at least can be inserted into the connection position between the flow guide 31 and the housing structure 20.

The distance between the end of the flow guiding tube 31 outside the housing structure 20 and the innermost side of the housing structure 20 of the adhesive layer 33 is L1, and the length of the buffer structural member 34 is greater than L1, as shown in fig. 4. Since the adhesion layer 33 itself has a certain width, L1 is the distance between the end of the flow guiding tube 31 located outside the housing structure 20 and the side of the adhesion layer 33 located at the innermost side of the housing structure 20.

When the flow guiding tube 31 and any side of the shell structure 20 are packaged, the buffer structural member 34 needs to be implanted into the flow guiding tube 31 to prevent the shell structure 20 and the flow guiding tube 31 from being completely sealed in the heat sealing process to influence the use. The adhesive layer 33 is thermally fused to the housing structure 20.

After the top sealing of the battery cell 10 and the side sealing of the guide pipe 31 are completed, vacuumizing is performed, after the battery cell 10 and the shell structure 20 are completely attached, the inside of the shell structure 20 reaches a set vacuum state, vacuumizing is stopped, the vacuumizing device is disassembled, the plug 32 is plugged at one end of the guide pipe 31, which is positioned outside the shell structure 20, and at the moment, the battery cell 10 is packaged completely.

Electrolyte and exhaust gas during formation can also be injected through the draft tube 31. After the cell 10 is injected with liquid, formed and separated, the cell 10 is subjected to secondary packaging, and after the secondary packaging, the flow guide pipe 31 and the shell structure 20 are completely sealed. At a later time of shipment, the portion of the flow guide tube 31 located outside the housing structure 20 may be cut off, and the battery cell 10 shown in fig. 1 is shown in fig. 6 after the encapsulation is completed. Of course, if battery detection analysis is required, the portion of the flow guide 31 outside the housing structure 20 may not be cut.

Example two

Fig. 7 to 10 show a second embodiment, wherein the same or corresponding parts as those of the first embodiment are designated by the corresponding reference numerals. For simplicity, only the points of distinction between the second embodiment and the first embodiment will be described. The difference is that the vacuum flow guiding structure 30 is provided with at least two groups, so that the electric core 10 can have different functions, such as inert gas replacement, gas production analysis, liquid retention control and the like.

The battery cell 10 comprises a tab 11, a portion of the tab 11 of the battery cell 10 extends out of the housing structure 20, and the vacuum flow guiding structure 30 is arranged on one side of the housing structure 20, which does not extend out of the tab 11. Each vacuum flow directing structure 30 may be disposed on the same side or on different sides of the housing structure 20.

Two vacuum flow directing structures 30 are illustrated. As shown in fig. 7, two tabs 11 are located on the same side, and two vacuum flow guiding structures 30 are located on different sides. As shown in fig. 8, two lugs 11 are located on opposite sides, and two vacuum diversion structures 30 are located on opposite sides.

The packaging mode of the same-side tab or the different-side tab is adopted. The process is roughly as follows: the adhesive layer 33 is first combined with the flow guide tube 31, and the welded cell 10 and the casing structure 20 are subjected to top sealing and side sealing. It should be noted that the installation position of the flow guide tube 31 needs to be reserved during the side sealing. And then the buffer structural member 34 is implanted into the guide pipe 31 for final side edge sealing and packaging, and after the side edge sealing is cooled, the buffer structural member 34 is pulled out for vacuumizing the battery cell 10. After reaching the preset vacuum degree, the vacuumizing device is removed, the plug 32 is plugged at one end of the flow guide pipe 31, which is positioned outside the shell structure 20, so that the vacuum inside the battery cell 10 is realized, and meanwhile, the pit flushing-free effect is also realized.

Electrolyte and exhaust gas during formation can also be injected through the draft tube 31. After the cell 10 is injected with liquid, formed and separated, the cell 10 is subjected to secondary packaging, and after the secondary packaging, the flow guide pipe 31 and the shell structure 20 are completely sealed. In the subsequent shipment, the portion of the flow guide tube 31 located outside the housing structure 20 may be cut off, but if the battery detection and analysis is required, the portion of the flow guide tube 31 located outside the housing structure 20 may not be cut off. The cell 10 shown in fig. 7 is shown in fig. 9 after the packaging is completed. The cell 10 shown in fig. 8 is shown in fig. 10 after the packaging is completed. After secondary packaging, the battery cell 10 does not have the functions of fluid infusion, inert gas replacement, air extraction, gas production analysis and the like, but also has the effect of no pit flushing, and ensures the production efficiency, consistency and safety.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A battery, comprising:

a battery cell (10);

the shell structure (20) is formed by an aluminum plastic film, and the battery cell (10) is arranged in the shell structure (20);

the vacuum flow guide structure (30) is arranged on one side edge of the shell structure (20) and is partially arranged in the shell structure (20), and the vacuum flow guide structure (30) is configured to be connected with a vacuumizing device so as to vacuumize the shell structure (20), so that the shell structure (20) is in vacuum coating with the battery cell (10).

2. The battery according to claim 1, wherein the vacuum flow guiding structure (30) comprises a flow guiding tube (31), one end of the flow guiding tube (31) is arranged in the housing structure (20), and the other end of the flow guiding tube (31) can be communicated with the vacuumizing device.

3. The battery according to claim 2, wherein the vacuum flow guiding structure (30) further comprises an adhesive layer (33), the adhesive layer (33) is fixedly connected to the flow guiding tube (31), and the adhesive layer (33) is thermally fused to the heat sealing position of the housing structure (20).

4. A battery according to claim 3, wherein the adhesion layer (33) is provided with two layers, the two adhesion layers (33) are symmetrically fixedly connected to the flow guiding pipe (31), and the two adhesion layers (33) are mutually connected by hot melting.

5. A cell according to claim 3, wherein the vacuum flow guiding structure (30) further comprises a buffer structure (34), the buffer structure (34) being capable of penetrating the flow guiding tube (31) and supporting a channel within the flow guiding tube (31).

6. The battery according to claim 5, characterized in that the buffer structure (34) is a wire or a strip of silicone.

7. The battery according to claim 2, characterized in that the end of the flow conduit (31) located in the housing structure (20) is spaced apart from the electrical cell (10).

8. The battery according to claim 2, wherein the vacuum flow guiding structure (30) further comprises a plug (32), the plug (32) is detachably connected to an end of the flow guiding tube (31) located outside the housing structure (20), and the plug (32) is capable of plugging the flow guiding tube (31).

9. The battery according to claim 1, wherein the tab (11) of the cell (10) partially protrudes from the housing structure (20), and the vacuum flow guiding structure (30) is disposed on a side of the housing structure (20) that does not protrude from the tab (11).

10. The battery according to any one of claims 1-9, wherein the vacuum flow guiding structure (30) is provided with at least two sets.