Battery cell heat seal head and heat seal assembly

Abstract

The application relates to an electric core heat-sealing head and a heat-sealing assembly. The electric core heat-sealing head comprises a head body, the head body comprises a base part, a connecting part and a heat-sealing part, the connecting part is connected between the heat-sealing part and the base part, one side of the heat-sealing part away from the connecting part is provided with a heat-pressing surface for heat-pressing an aluminum plastic film; a heat insulation layer is arranged on the side surface of the electric core heat-sealing head extending along the length direction of the electric core heat-sealing head, and the heat insulation layer covers at least the side surface of the connecting part. The scheme provided by the application can weaken the heat radiation effect of the heat-sealing head on the aluminum plastic film and prevent the deformation of the edge of the electric core.

Description

Technical Field

[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to a cell heat-sealing head and heat-sealing assembly. Background Technology

[0002] In the manufacturing process of pouch lithium batteries, aluminum-plastic film serves as the outer casing for the battery cell and requires heat sealing to seal its edges and isolate it from the external environment. During heat sealing, the packaging equipment drives the heat sealing head to press the aluminum-plastic film stacked areas together. High temperatures melt and bond the inner layers of the aluminum-plastic film, forming an airtight seal. The quality of the seal directly affects the battery cell's performance in preventing electrolyte leakage and its long-term reliability.

[0003] In related technologies, the heat-sealing head used for the aluminum-plastic film encapsulating soft-pack battery cells is usually made of a flat metal block. However, when the heat-sealing head is heated as a whole and brought close to the sealing edge of the soft-pack battery cell, the aluminum-plastic film of the battery cell will deform due to the heat radiation effect of the heat-sealing head, leaving pits or embossing marks at the sealing edge after sealing. This directly affects the appearance and packaging quality of the soft-pack battery cell. Utility Model Content

[0004] To address or partially address the problems existing in the related technologies, this application provides a heat-sealing head and heat-sealing assembly for battery cells, which can reduce the heat radiation effect of the heat-sealing head on the aluminum-plastic film and prevent deformation of the battery cell sealing edge.

[0005] The first aspect of this application provides a heat-sealing head for a battery cell, comprising: a head body, the head body including a base portion, a connecting portion and a heat-sealing portion, the connecting portion connecting the heat-sealing portion and the base portion, and the heat-sealing portion having a heat-pressing surface for heat-pressing an aluminum-plastic film on the side opposite to the connecting portion; The heat-sealing head of the battery cell has a heat insulation layer on its side extending along the length direction of the heat-sealing head, and the heat insulation layer at least covers the side of the connection portion.

[0006] Furthermore, the heat insulation layer is made of ceramic matrix composite material.

[0007] Furthermore, the heat insulation layer is made of silicon carbide, ZrO2-SiO2 composite material or high-entropy porous boride ceramic material.

[0008] Furthermore, the base portion, the connecting portion, and the heat-sealing portion are arranged to form a receiving groove, and at least a portion of the heat insulation layer is placed in the receiving groove.

[0009] Furthermore, the receiving grooves are provided on both sides of the connecting part, the width a of the heat-sealing part is 0.6mm-1.2mm, and the width e of the connecting part is 0.2mm-0.8mm.

[0010] Furthermore, the height f of the receiving groove is 2mm-10mm, and the thickness d of the heat insulation layer in the receiving groove is 0.4mm-0.8mm.

[0011] Furthermore, the heat insulation layer extends to the side of the heat-sealing part, the height c of the heat insulation layer covering the side of the heat-sealing part is 0.1mm-0.6mm, the distance g between the hot-pressing surface and the heat insulation layer is 0.1mm-2mm, and the thickness b of the heat insulation layer on the heat-sealing part is 0.1mm-0.5mm.

[0012] Furthermore, the heat-sealing part and the connecting part have a T-shaped structure.

[0013] Furthermore, the aforementioned heat-sealing head of the battery cell also includes a spacer layer, which at least covers the heat-pressed surface. The spacer layer is made of Teflon material, and the thickness h of the spacer layer is 0.08mm-0.12mm.

[0014] A second aspect of this application provides a heat-sealing assembly, comprising: two cell heat-sealing heads disposed opposite to each other as described in any of the preceding claims.

[0015] The technical solution provided in this application may include the following beneficial results: by providing a heat insulation layer on the side of the heat-sealing head of the battery cell extending along the length of the heat-sealing head, the heat insulation layer at least covers the side of the connection part. When the heat-sealing head of the battery cell is close to the aluminum-plastic film, the heat insulation layer can reduce the heat diffusion of the heat-sealing head of the battery cell to the outside, thereby weakening the heat radiation effect of the heat-sealing head on the aluminum-plastic film, preventing deformation of the battery cell sealing edge, avoiding pits or embossing at the sealing edge after sealing, and ensuring the appearance and packaging quality of the soft-pack battery cell.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0018] Figure 1 This is a cross-sectional schematic diagram of the heat-sealed end cap of the battery cell shown in the embodiments of this application; Figure 2 This is another cross-sectional schematic diagram of the heat-sealed head of the battery cell shown in the embodiments of this application; Figure 3 This is a cross-sectional schematic diagram of the heat-sealing assembly shown in an embodiment of this application.

[0019] Figure label: 1-Head body, 11-Base part, 12-Connecting part, 13-Heat sealing part, 131-Hot pressing surface, 2-Insulation layer, 3-Receiving groove, 4-Partition, 5-Upper heat-sealing head, 6-Lower heat-sealing head. Detailed Implementation

[0020] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0021] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In related technologies, the heat-sealing head used for the aluminum-plastic film encapsulating soft-pack battery cells is usually made of a flat metal block. However, when the heat-sealing head is heated as a whole and brought close to the sealing edge of the soft-pack battery cell, the aluminum-plastic film of the battery cell will deform due to the heat radiation effect of the heat-sealing head, leaving pits or embossing marks at the sealing edge after sealing. This directly affects the appearance and packaging quality of the soft-pack battery cell.

[0025] To address the aforementioned issues, this application provides a heat-sealing head and heat-sealing assembly for battery cells, which can reduce the heat radiation effect of the heat-sealing head on the aluminum-plastic film and prevent deformation of the battery cell sealing edges.

[0026] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0027] Figure 1 This is a cross-sectional schematic diagram of a heat-sealing head for a battery cell, as shown in an embodiment of this application. The cutting plane of this cross-sectional view is perpendicular to the length direction of the heat-sealing head for the battery cell. Figure 1 This is a cross-sectional view taken along the width of the heat-sealed head of the battery cell.

[0028] like Figure 1 As shown, this application provides a heat-sealing head for a battery cell, including a head body 1. The head body 1 includes a base portion 11, a connecting portion 12, and a heat-sealing portion 13. The connecting portion 12 is connected between the heat-sealing portion 13 and the base portion 11. The heat-sealing portion 13 has a heat-pressing surface 131 for heat-pressing aluminum-plastic film on the side opposite to the connecting portion 12.

[0029] The base portion 11, connecting portion 12, and heat-sealing portion 13 can be integrally formed and made of copper or aluminum. In the illustration, the base portion 11, connecting portion 12, and heat-sealing portion 13 are arranged sequentially from bottom to top; that is, the base portion 11 is connected to the lower end of the connecting portion 12, and the heat-sealing portion 13 is connected to the upper end of the connecting portion 12. The base portion 11 is used to connect to a heat-sealing device, which can drive the heat-sealing head of the battery cell to move.

[0030] A heat insulation layer 2 is provided on the side of the heat-sealing head of the battery cell extending along its length, and the heat insulation layer 2 at least covers the side of the connecting portion 12. In the figure, the length direction of the heat-sealing head of the battery cell is perpendicular to... Figure 1 The orientation of the paper.

[0031] Based on the above-mentioned heat-sealing head of the battery cell, a heat insulation layer 2 is provided on the side of the heat-sealing head extending along the length direction of the heat-sealing head. The heat insulation layer 2 covers at least the side of the connecting part 12. When the heat-sealing head of the battery cell is close to the aluminum-plastic film, the heat insulation layer 2 can reduce the heat diffusion of the heat-sealing head of the battery cell to the outside, thereby weakening the heat radiation effect of the heat-sealing head on the aluminum-plastic film. This prevents the aluminum-plastic film from deforming due to heat radiation before the heat-sealing head of the battery cell has heat-sealed the aluminum-plastic film, thereby avoiding pits or embossing at the sealing edge after sealing, and ensuring the appearance and packaging quality of the soft-pack battery cell.

[0032] In some embodiments, the thermal insulation layer 2 is made of a ceramic matrix composite material. Ceramic matrix composite materials have the characteristics of high hardness, high temperature resistance and good thermal insulation. As the thermal insulation layer 2, ceramic matrix composite materials can effectively reduce capacity diffusion of the heat-sealed head of the battery cell.

[0033] Optionally, the insulation layer 2 is made of silicon carbide, ZrO2-SiO2 composite material, or high-entropy porous boride ceramic material. Among them, ZrO2-SiO2 composite material and high-entropy porous boride ceramic material have ultra-low thermal conductivity and good thermal insulation performance.

[0034] In some embodiments, such as Figure 1 As shown, the base portion 11, the connecting portion 12, and the heat-sealing portion 13 enclose and form a receiving groove 3, and at least a portion of the heat insulation layer 2 is placed in the receiving groove 3. By placing the heat insulation layer 2 in the receiving groove 3, the thickness and volume of the heat insulation layer 2 can be increased, ensuring the stability of the connection of the heat insulation layer 2 and improving the heat insulation capacity.

[0035] In some embodiments, such as Figure 1 As shown, receiving grooves 3 are provided on both opposite sides of the connecting part 12. The width a of the heat-sealing part 13 is 0.6mm-1.2mm, and the width e of the connecting part 12 is 0.2mm-0.8mm. Thus, with heat insulation layers 2 on both sides of the connecting part 12, the smaller width of the connecting part 12 results in less heat carried by itself. Furthermore, the heat insulation effect of the heat insulation layers 2 on both sides effectively reduces the heat radiation effect of the battery cell heat-sealing head on the aluminum-plastic film. The effective sealing width of the heat-sealing part 13 is a.

[0036] In some embodiments, such as Figure 1 As shown, the height f of the receiving groove 3 is 2mm-10mm, and the thickness d of the heat insulation layer 2 in the receiving groove 3 is 0.4mm-0.8mm. The height of the receiving groove 3 is the same as the height of the connecting part 12. The thickness of the heat insulation layer 2 in the receiving groove 3 is set to 0.4mm-0.8mm, which can effectively prevent heat from spreading outward.

[0037] In some embodiments, such as Figure 1As shown, the heat insulation layer 2 extends to the side of the heat-sealing part 13. The height c of the heat insulation layer 2 covering the side of the heat-sealing part 13 is 0.1mm-0.6mm, the distance g between the hot-pressing surface 131 and the heat insulation layer 2 is 0.1mm-2mm, and the thickness b of the heat insulation layer 2 on the heat-sealing part 13 is 0.1mm-0.5mm. Extending the heat insulation layer 2 to the side of the heat-sealing part 13 can reduce heat diffusion in the heat-sealing part 13 and further weaken the heat radiation effect. Leaving a certain distance g between the hot-pressing surface 131 and the heat insulation layer 2, so that the side of the heat-sealing part 13 is not completely covered by the heat insulation layer 2, can effectively ensure the contact between the heat-sealing part 13 and the aluminum-plastic film.

[0038] In some embodiments, such as Figure 1 As shown, the heat-sealing part 13 and the connecting part 12 have a T-shaped structure. Specifically, the connecting part 12 is connected to the middle of the heat-sealing part 13, and the width of the heat-sealing part 13 is greater than the width of the connecting part 12. In this way, the connecting part 12 carries less heat during heat transfer. Heat insulation layers 2 are provided on both the left and right sides of the connecting part 12 to effectively reduce the heat radiation of the heat-sealed head of the battery cell.

[0039] Figure 2 This is another cross-sectional schematic diagram of the heat-sealing head of the battery cell shown in the embodiments of this application, wherein the cutting plane of this cross-sectional view is perpendicular to the length direction of the heat-sealing head of the battery cell, that is... Figure 1 This is a cross-sectional view taken along the width of the heat-sealed head of the battery cell.

[0040] like Figure 2 As shown in the embodiments of this application, another type of heat-sealing head for battery cells is also provided, which differs from the embodiments described above. Figure 2 The heat-sealing head of the battery cell shown also includes a spacer 4, which at least covers the heat-sealing surface 131. The spacer 4 is made of Teflon material, and its thickness h is 0.08mm-0.12mm. Specifically, as... Figure 1 As shown, the partition 4 covers not only the hot-pressed surface 131, but also the lower surface of the heat insulation layer 2.

[0041] The spacer 4, made of Teflon material, has high temperature resistance, corrosion resistance, non-stick properties, wear resistance, and a low coefficient of friction. It can protect the head body 1, prevent its damage, and improve the service life of the heat-sealed head of the battery cell.

[0042] like Figure 3 As shown in the embodiments of this application, a heat-sealing assembly is also provided, including two cell heat-sealing heads arranged opposite to each other as described in the above embodiments. The two cell heat-sealing heads are an upper heat-sealing head 5 and a lower heat-sealing head 6, respectively. The heat-sealing equipment can drive the upper heat-sealing head 5 and the lower heat-sealing head 6 to move closer to each other or further away from each other, thereby completing the heat sealing of the aluminum-plastic film.

[0043] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0044] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A heat-sealing head for a battery cell, characterized in that, include: The end cap body includes a base part, a connecting part and a heat sealing part. The connecting part connects the heat sealing part and the base part. The heat sealing part has a heat-pressing surface for heat-pressing aluminum-plastic film on the side opposite to the connecting part. The heat-sealing head of the battery cell has a heat insulation layer on its side extending along the length direction of the heat-sealing head, and the heat insulation layer at least covers the side of the connection portion.

2. The cell heat-sealing head according to claim 1, characterized in that: The insulation layer is made of ceramic matrix composite material.

3. The cell heat-sealing head according to claim 1, characterized in that: The heat insulation layer is made of silicon carbide, ZrO2-SiO2 composite material or high-entropy porous boride ceramic material.

4. The cell heat-sealing head according to claim 1, characterized in that: The base portion, the connecting portion, and the heat-sealing portion enclose and form a receiving groove, with at least a portion of the heat insulation layer placed in the receiving groove.

5. The cell heat-sealing head according to claim 4, characterized in that: The receiving groove is provided on both sides of the connecting part, the width a of the heat-sealing part is 0.6mm-1.2mm, and the width e of the connecting part is 0.2mm-0.8mm.

6. The cell heat-sealing head according to claim 4, characterized in that: The height f of the receiving groove is 2mm-10mm, and the thickness d of the heat insulation layer in the receiving groove is 0.4mm-0.8mm.

7. The cell heat-sealing head according to claim 1, characterized in that: The heat insulation layer extends to the side of the heat-sealing part, the height c of the heat insulation layer covering the side of the heat-sealing part is 0.1mm-0.6mm, the distance g between the hot-pressing surface and the heat insulation layer is 0.1mm-2mm, and the thickness b of the heat insulation layer on the heat-sealing part is 0.1mm-0.5mm.

8. The cell heat-sealing head according to claim 1, characterized in that: The heat-sealing part and the connecting part have a T-shaped structure.

9. The cell heat-sealing head according to claim 1, characterized in that: It also includes a partition layer that at least covers the hot-pressed surface, the partition layer being made of Teflon material and having a thickness h of 0.08mm-0.12mm.

10. A heat-sealing assembly, characterized in that, include: Two heat-sealing heads for the battery cell as described in any one of claims 1-9 are arranged opposite each other.

Images