Battery cell edgefold hot-pressing piece, edgefold hot-pressing assembly and equipment

Abstract

The utility model relates to a battery cell edge-folding hot-pressing piece, an edge-folding hot-pressing assembly and equipment. The battery cell flanging hot-pressing piece comprises a main body, the main body is provided with an assembling part and a hot-pressing part, the assembling part is used for being assembled on flanging equipment, the hot-pressing part is provided with a flexible piece, the flexible piece is provided with a hot-pressing contact part, and the hot-pressing contact part is used for being in contact with a flanging of a battery cell so as to press the flanging of the battery cell on the battery cell. According to the scheme provided by the invention, the aluminum-plastic film folding edge on the side edge of the battery cell can be more tightly attached to the battery cell main body, so that the width of the packaged battery cell is reduced, the width consistency of the battery cell can be improved, and the assembly of the battery pack is not influenced.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a cell edge folding and hot pressing member, an edge folding and hot pressing assembly, and a device. Background Art

[0002] With the development of new energy technologies, the processing requirements for battery products are also getting higher and higher. Therefore, higher requirements are also put forward for the width consistency and volumetric energy density of batteries. In related technologies, when packaging a soft-packaged lithium battery, the aluminum plastic film is folded in half together to completely wrap the cell, and then the folded aluminum plastic film is sealed by heat sealing. The excess sealed side edges need to be cut and edge folded.

[0003] However, after the edge folding process, due to the poor fit between the edge fold and the cell body, the width of the cell is relatively large, which affects the width consistency of the cell and the assembly of the battery pack. Summary of the Utility Model

[0004] To solve or partially solve the problems existing in the related technologies, the present application provides a cell edge folding and hot pressing member, an edge folding and hot pressing assembly, and a device, which can make the edge fold of the cell side fit more closely with the cell body, thereby reducing the width of the cell after packaging.

[0005] In a first aspect of the present application, a cell edge folding and hot pressing member is provided, including:

[0006] A main body, the main body is provided with an assembly part and a hot pressing part. The assembly part is used for assembling on an edge folding device. The hot pressing part is provided with a flexible member, and the flexible member is provided with a hot pressing contact part. The hot pressing contact part is used to contact the edge fold of the cell to press the edge fold of the cell onto the cell.

[0007] In one implementation, the shape of the hot pressing contact part is set to match the shape of the side part of the cell.

[0008] In one implementation, the shape of the hot pressing contact part is a concave arc surface.

[0009] In one implementation, a flexible heat-conducting material layer with a preset thickness is provided on the surface of the hot pressing part facing the cell, and the flexible heat-conducting material layer forms the flexible member.

[0010] In one implementation, the thickness of the flexible heat-conducting material layer is 10 - 20 mm.

[0011] In one implementation, the hot pressing part is made of a flexible heat-conducting material, and the hot pressing part and the flexible member are integrally formed.

[0012] In one implementation, the main body is a long block, the height of the block is greater than the thickness of the battery cell, the hot pressing part is arranged on one side of the block in the thickness direction, and the flexible part is arranged along the length direction of the block.

[0013] In one implementation, the flexible part is made of silica gel.

[0014] In the second aspect of the present application, a hemming and hot pressing assembly is provided, including:

[0015] Two hot pressing parts as described in the first aspect above, the two hot pressing parts are arranged opposite to each other, and a battery cell is placed between the two hot pressing parts. The flexible parts of the two hot pressing parts respectively act on the hems of two parallel sides of the battery cell.

[0016] In the third aspect of the present application, a hemming and hot pressing device is provided, including a machine body. A workbench is provided on the machine body, and the hot pressing assembly as described in the second aspect above is installed on the workbench.

[0017] The technical solution provided by the present application may include the following beneficial effects:

[0018] In the solution provided by the present application, the hot pressing part is provided with a flexible part, and the flexible part is provided with a hot pressing contact part. When hemming the battery cell, due to the good thermal conductivity and elastic deformation characteristics of the flexible part, under the action of elastic deformation, the hot pressing contact part can act on each position in the width direction of the battery cell. For example, it can act on the position of 1 / 2 or below the thickness of the battery cell. Furthermore, the aluminum-plastic film hem on the side of the battery cell can be more closely attached to the battery cell body, thereby reducing the width of the battery cell after encapsulation, improving the width consistency of the battery cell, and not affecting the assembly of the battery pack.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0021] Figure 1 It is a schematic structural diagram of a battery cell hemming and hot pressing part in the related art.

[0022] Figure 2 It is a schematic structural diagram of a battery cell hemming and hot pressing part shown in the embodiment of the present application.

[0023] Reference numerals: 100, main body; 110, assembly part; 120, flexible part; 121, hot pressing contact part; 200, battery cell; 210, aluminum plastic film; 211, arc part; 212, folded edge. Detailed implementation manners

[0024] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0025] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0026] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0028] Unless otherwise clearly defined and limited, the terms "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] The embodiments of the present application provide a cell hemming hot pressing part, a hemming hot pressing assembly and a device, which can make the hem on the side of the cell fit more closely with the cell body, thereby reducing the width of the cell after encapsulation.

[0030] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] Figure 2 It is a schematic structural diagram of the cell hemming hot pressing part shown in the embodiments of the present application.

[0032] See Figure 2 , the present application provides a hemming hot pressing part for a cell. The hot pressing part includes a main body 100. The main body 100 is provided with an assembly part 110 and a hot pressing part. The assembly part 110 is used for assembling on a hemming device. The hot pressing part is provided with a flexible part 120. The flexible part 120 is provided with a hot pressing contact part 121. The hot pressing contact part 121 is used to contact the cell 200 to attach the hem 212 on the side of the cell 200 to the cell 200.

[0033] A heating device such as a heating tube or a heating wire is arranged inside the main body 100 to heat the hot pressing part, and the heating power can be set. The heat can be conducted to the flexible part 120, and then the hem 212 of the battery can be hot pressed and attached at a set temperature.

[0034] In some embodiments, the material of the flexible part 120 can be silicone, but not limited thereto. It can also be other polymer materials with elasticity, thermal conductivity, and good high temperature resistance and wear resistance, such as silicone materials, graphene composite materials, nano materials, etc.

[0035] In the related art, for a soft-packaged lithium battery, the aluminum plastic film is folded together to completely wrap the cell, and then the folded aluminum plastic film is sealed by heat sealing to fuse the insulating heat-sealing layers of the aluminum plastic film together, thereby forming a sealed hem. In order to reduce the volume of the battery and improve the energy density, the excess sealed hem needs to be cut. The remaining hem after cutting will increase the width of the battery, occupy the volume space of the lithium battery, and affect the space utilization rate. Therefore, the hem is usually hemmed (folded inward towards the cell).

[0036] Figure 1It is a schematic structural diagram of a cell hemming hot pressing part in the related art. Refer to Figure 1 , in the related art, the hemming process generally uses a hot pressing part 101 (also called a hot head) with hot pressing surfaces 102 at different inclined angles to press the hem on the side of the cell. However, the inclined angle of the hot pressing surface 102 can only be adjusted according to experience. When the widest point of the cell is at the 1 / 2 position or below of the cell thickness, that is, at the 1 / 2 position or below of the height of the hot pressing part, the hot pressing surface 102 will not be able to act on the widest position of the cell, resulting in a certain opening distance still remaining after the hemming hot pressing, making the width dimension of the cell after encapsulation larger.

[0037] Continue to refer to Figure 2 , in the solution provided by the present application, the hot pressing part is provided with a flexible part 120, and the flexible part 120 is provided with a hot pressing contact part 121. Due to the good heat conductivity and elastic deformation characteristics of the flexible part 120, when hot pressing the hem 212 of the cell 200, under the action of elastic deformation, the hot pressing contact part 121 can act on various positions in the width direction of the cell 200. For example, it can act on the 1 / 2 position or below of the thickness of the cell 200, and can also fit the arc part 211 formed after the aluminum-plastic film of the cell is bent and encapsulated. Furthermore, it can make the aluminum-plastic film hem 212 on the side and corner of the cell 200 fit more closely with the main body 100 of the cell 200, thereby reducing the width of the cell 200 after encapsulation, improving the width consistency of the cell 200, and not affecting the assembly of the battery pack.

[0038] In some embodiments, the shape of the hot pressing contact part 121 is set to match the shape of the side of the cell 200, which can change its shape according to the change in the thickness of the cell 200, making the side aluminum-plastic film 210 fit more closely with the cell 200. For example, the shape of the hot pressing contact part 121 can be set as a concave arc surface, and the arc surface can be a regular or irregular arc surface. Since the cell 200 is wrapped by the aluminum-plastic film 210, there is an arc part 211 between two adjacent surfaces of the cell 200, and the hem 212 of the cell 200 needs to fit this arc part 211. In the present application, the shape of the hot pressing contact part 121 can be set as a concave arc surface. During hot pressing, the hot pressing contact part 121 can fit the arc part 211 of the cell 200, and then make the hem 212 closely adhere to the arc part 211, thereby reducing the width of the cell.

[0039] In one implementation manner for forming the flexible part 120 in the present application: a flexible heat-conducting material layer with a preset thickness is provided on the surface of the hot pressing part facing the cell 200, and the flexible heat-conducting material layer forms the flexible part 120. The flexible heat-conducting material layer can be attached to the surface of the hot pressing part facing the cell 200 by means of coating or spraying. The thickness of the flexible heat-conducting material layer can be 10 - 20 mm. At this thickness dimension, sufficient elastic deformation space is provided for the flexible part 120, and then it can adaptively fit the side shape of the cell 200.

[0040] In order to form the flexible member 120 in the present application, in another embodiment: In some embodiments, the hot pressing part and the flexible member 120 are of an integral structure, and the hot pressing part is made of a flexible heat-conducting material, that is, the hot pressing part and the flexible member 120 are made of the same material.

[0041] In this embodiment, the main body 100 of the hot pressing member is in the shape of a long block, and the assembly part 110 is made of a metal material and is connected to the driving member of the hemming hot pressing device through a fastener. In some embodiments, the assembly part 110 can be made of iron or brass, for example, and the hot pressing part is fixed to one side of the assembly part 110. Among them, the height of the block is greater than the thickness of the battery cell 200 so that the flexible member 120 acts on the entire side of the battery cell 200. The hot pressing part is arranged on one side of the block in the thickness direction, and the flexible member 120 is arranged along the length direction of the block so that the flexible member acts on the hemming of the side of the battery cell 200 along the length direction.

[0042] The above has introduced the hemming hot pressing member of the present application. Correspondingly, the present application also provides a hot pressing assembly for hemming the battery cell 200. Continuing to refer to Figure 2 , the hot pressing assembly includes two hot pressing members as described in the above embodiments, and the two hot pressing members are arranged oppositely; the battery cell 200 is placed between the two hot pressing members, and flexible members 120 are provided on the opposite sides of the two hot pressing members, and the flexible members 120 of the two hot pressing parts respectively act on the hems of the two parallel sides of the battery cell 200. When the two hot pressing members move towards each other, the flexible members 120 of the two hot pressing members respectively approach the hems of the two sides of the battery cell 200, and then the two hems on both sides of the battery cell 200 are hot pressed and adhered simultaneously.

[0043] The present application also provides a hemming hot pressing device, which includes a machine body. The machine body is provided with a workbench, and the above-described hot pressing assembly is installed on the workbench. A battery to be hemmed is fixed on the workbench. The two hot pressing members are set on both sides of the battery. Heating devices such as heating tubes or heating wires are provided inside the two hot pressing members to heat the hot iron heads, and the heating power can be set. A driving device can be installed on the workbench, and the driving device drives the two hot pressing members to move towards or away from each other. When moving towards each other, the two hot pressing members approach the battery cell, and then the hems are hot pressed.

[0044] In the hot pressing device provided by the present application, the two hot pressing members of the hot pressing assembly are provided with flexible members, and the flexible members are provided with hot pressing contact parts. During the hemming operation of the battery cell, due to the good heat conductivity and elastic deformation characteristics of the flexible members, under the action of elastic deformation, the hot pressing contact parts can act on various positions in the width direction of the battery cell, and can make the aluminum-plastic film hem on the side of the battery cell fit more closely with the battery cell body, thereby reducing the width of the battery cell after encapsulation, improving the width consistency of the battery cell, and not affecting the assembly of the battery pack.

[0045] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of technologies in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A cell hemming and hot pressing part, characterized in that, Comprising: A main body, which is provided with an assembly part and a hot pressing part. The assembly part is used for being assembled on a hemming device. The hot pressing part is provided with a flexible part, and the flexible part is provided with a hot pressing contact part. The hot pressing contact part is used for contacting the hem of the battery cell to press the hem of the battery cell onto the battery cell.

2. The battery cell hemming hot pressing piece according to claim 1, characterized in that: The shape of the hot pressing contact part is arranged in cooperation with the shape of the side part of the battery cell.

3. The battery cell hemming hot pressing piece according to claim 1, characterized in that: The shape of the hot pressing contact part is a concave arc surface.

4. The battery cell hemming hot pressing piece according to claim 1, characterized in that: On one side surface of the hot pressing part facing the battery cell, there is provided a flexible heat-conducting material layer with a preset thickness, and the flexible heat-conducting material layer forms the flexible part.

5. The battery cell hemming hot pressing piece according to claim 4, characterized in that: The thickness of the flexible heat-conducting material layer is 10 - 20 mm.

6. The battery cell hemming hot pressing piece according to claim 1, characterized in that: The hot pressing part is made of a flexible heat-conducting material, and the hot pressing part and the flexible part are integrally formed.

7. The battery cell hemming hot pressing piece according to claim 1, characterized in that: The main body is in the shape of a long block. The height of the block is greater than the thickness of the battery cell. The hot pressing part is arranged on one side of the block along the thickness direction, and the flexible part is arranged along the length direction of the block.

8. The battery cell hemming hot pressing piece according to any one of claims 1 - 7, characterized in that: The material of the flexible part is silicone.

9. A hemming hot pressing assembly, characterized in that, Comprising: Two hot pressing pieces according to claims 1 - 8. The two hot pressing pieces are arranged oppositely, and a battery cell is placed between the two hot pressing pieces. The flexible parts of the two hot pressing parts respectively act on the hems of two parallel side parts of the battery cell.

10. A hemming hot pressing device, characterized in that, Comprising a machine body, the machine body is provided with a workbench, and a hot pressing assembly according to claim 9 is installed on the workbench.

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