Soft package battery cell heat dissipation structure and soft package battery cell module

Abstract

The invention provides a soft package battery cell heat dissipation structure and a soft package battery cell module, and relates to the technical field of soft package battery cell heat dissipation, and the soft package battery cell heat dissipation structure comprises a heat dissipation part which is used for being arranged at at least one end of a plurality of soft package battery cells which are linearly stacked and arranged; the interface heat conduction layer is arranged between the heat dissipation part and the plurality of soft package battery cells; the heat conduction plate is arranged between the soft package battery cells, at least one end of the heat conduction plate is provided with a bending part, and the bending part is connected to one side, close to the plurality of soft package battery cells, of the interface heat conduction layer; the problems of limited heat dissipation area and low heat dissipation efficiency of the soft package battery cell in the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the field of heat dissipation technology for pouch cells, and more specifically, relates to a heat dissipation structure for pouch cells and a pouch cell module. Background Technology

[0002] In pouch battery systems, such as Figure 1 As shown, the commonly used cooling method is liquid cooling. Multiple pouch cells 1 are connected by foam layers 2 or adhesive layers 3. Heat sinks, such as liquid cooling plates 4, are installed on one or more of the four end faces of the pouch cells 1 outside the stacking direction. Regardless of the heat dissipation structure, an interface thermal conductive layer 5 is required to fill the microscopic gaps between the heat source and the heat sink, eliminating the insulation effect caused by the air layer and establishing an efficient heat conduction path. However, due to processing and assembly tolerances, and mismatches in thermal expansion coefficients, the thickness of the interface thermal conductive layer 5 cannot be too thin; otherwise, insufficient contact between the heat source and the heat sink may still occur. The thermal conductivity of the interface thermal conductive layer 5 material is still significantly lower than that of the materials on both sides; a thicker interface thermal conductive material still limits the system's heat dissipation. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a heat dissipation structure and module for pouch cells, thereby solving the problems of limited heat dissipation area and low heat dissipation efficiency of pouch cells in existing technologies.

[0004] To achieve the above objectives, the present invention provides a heat dissipation structure for a pouch cell, comprising: A heat dissipation component, the heat dissipation component being disposed at at least one end of a plurality of pouch cells arranged in a linear stack; An interface thermal conductive layer is disposed between the heat dissipation component and multiple soft-pack battery cells; A heat-conducting plate is disposed between the pouch cells, and at least one end of the heat-conducting plate is provided with a bent portion, which is connected to the side of the interface heat-conducting layer near the plurality of pouch cells.

[0005] Optionally, the heat dissipation component includes a liquid cooling plate.

[0006] Optionally, the interface thermal conductive layer is a compressible thermal conductive pad or a thermal conductive structural adhesive layer.

[0007] Optionally, the bent portion is provided with a plurality of protrusions that protrude toward the interface thermal conductive layer.

[0008] Optionally, a buffer layer is provided between at least some of the pouch cells.

[0009] Optionally, the buffer layer is a foam layer, and the foam layer is bonded to the soft-pack battery cell.

[0010] Optionally, the heat-conducting plate is an aluminum plate.

[0011] Optionally, at least one large surface side of the heat-conducting plate is covered with a graphene film.

[0012] Optionally, the bending portion is located on the aluminum-plastic film sealing side of the soft-pack battery cell.

[0013] The present invention also provides a pouch cell module, comprising: Multiple pouch cells; The above-mentioned heat dissipation structure for soft-pack battery cells.

[0014] This invention provides a heat dissipation structure for pouch cells and a pouch cell module. Its advantages are as follows: the heat dissipation structure features a heat-conducting plate between the pouch cells, with the large side of the heat-conducting plate contacting the large side of the pouch cell. A bent portion at the end of the heat-conducting plate connects to the interface heat-conducting layer, increasing the heat conduction path for the pouch cells. The large contact area between the heat-conducting plate and the pouch cells allows heat to be transferred to the interface heat-conducting layer and heat dissipation components through the excellent thermal conductivity of the heat-conducting plate, thereby improving heat dissipation efficiency and effect.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0017] Figure 1 A schematic diagram of the structure of a pouch battery module in the prior art is shown.

[0018] Figure 2 An exploded view of a heat dissipation structure for a pouch cell according to an embodiment of the present invention is shown.

[0019] Figure 3 A schematic diagram of a heat-conducting plate for a heat dissipation structure of a pouch cell according to an embodiment of the present invention is shown.

[0020] Figure 4 It shows Figure 3 A magnified view of a portion of the image.

[0021] Figure 5 It shows Figure 4 A partial cross-sectional schematic diagram.

[0022] Figure 6 An exploded structural diagram of a heat dissipation structure for a pouch cell according to another embodiment of the present invention is shown.

[0023] Explanation of reference numerals in the attached figures: 1. Soft-pack battery cell; 2. Foam layer; 3. Adhesive layer; 4. Liquid cooling plate; 5. Interface thermal conductive layer; 6. Thermal conductive plate; 7. Bending part; 8. Protrusion. Detailed Implementation

[0024] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0025] like Figure 2 As shown, the present invention provides a heat dissipation structure for a pouch cell, comprising: A heat dissipation component is provided at at least one end of a plurality of pouch cells 1 arranged in a straight stack. The interface thermal conductive layer 5 is disposed between the heat dissipation component and the multiple soft-pack battery cells 1. A heat-conducting plate 6 is disposed between the pouch cells 1. At least one end of the heat-conducting plate 6 is provided with a bent portion 7, which is connected to the side of the interface heat-conducting layer 5 near the plurality of pouch cells 1.

[0026] Specifically, to address the problems of limited heat dissipation area and low heat dissipation efficiency of the existing pouch cell 1, the heat dissipation structure of the pouch cell provided by this invention includes a heat-conducting plate 6 between the pouch cells 1. The large side of the heat-conducting plate 6 contacts the large side of the pouch cell 1, and the bent portion 7 at the end of the heat-conducting plate 6 connects to the interface heat-conducting layer 5, thus increasing the heat conduction path for the pouch cell 1. The large contact area between the heat-conducting plate 6 and the pouch cell 1 allows heat to be transferred to the interface heat-conducting layer 5 and the heat dissipation components through the good thermal conductivity of the heat-conducting plate 6, thereby improving the heat dissipation efficiency and effect.

[0027] Optionally, the heat dissipation component includes a liquid cooling plate 4.

[0028] Specifically, a liquid cooling plate 4 is used as a liquid cooling component to dissipate heat from the pouch cell 1.

[0029] Optionally, the interface thermal conductive layer 5 is a compressible thermal conductive pad or a thermal conductive structural adhesive layer 3.

[0030] Specifically, the interface thermal conductive layer 5 is made of a flexible material with certain compressibility, which can fill the gap between the heat source and the heat dissipation component and eliminate the insulation effect caused by the air layer.

[0031] Optionally, the bent portion 7 is provided with a plurality of protrusions 8 that protrude toward the interface heat-conducting layer 5.

[0032] Specifically, such as Figures 3 to 5 As shown, the arrangement of multiple protrusions 8 can increase the heat dissipation area of ​​the heat-conducting plate 6, compress the interface heat-conducting layer 5, locally reduce the material thickness of the heat-conducting interface layer, reduce the distance between it and the heat dissipation component, reduce the overall thermal resistance between the heat-conducting plate 6 and the heat dissipation component, and thus improve the heat dissipation efficiency and heat dissipation effect.

[0033] Furthermore, the protrusion 8 can be formed by stamping, and the bending part 7 can be bent after the protrusion 8 is formed; the shape of the protrusion 8 can be a semi-circular protrusion, a capsule-shaped protrusion, etc.

[0034] Optionally, a buffer layer is provided between at least some of the pouch cells 1.

[0035] Specifically, the buffer layer can provide pre-tightening force between the pouch cells 1 and absorb the expansion of the pouch cells 1.

[0036] Optionally, the buffer layer is a foam layer 2, which is bonded to the soft-pack battery cell 1.

[0037] Specifically, the buffer layer can be a foam layer 2 with adhesive on both sides, which is connected between the soft-pack battery cells 1 by bonding.

[0038] Optionally, the heat-conducting plate 6 is an aluminum plate.

[0039] Specifically, the heat-conducting plate 6 can be made of aluminum, which provides an additional heat conduction path by utilizing its thermal conductivity, thereby enhancing the heat dissipation of the soft-pack battery cell 1.

[0040] Optionally, at least one large surface side of the heat-conducting plate 6 is covered with a graphene film.

[0041] Specifically, to further improve thermal conductivity, the heat-conducting plate 6 can also be an aluminum plate with a graphene film covering its large side.

[0042] Optionally, the bending portion 7 is provided on the aluminum-plastic film sealing side of the soft-pack battery cell 1.

[0043] Specifically, due to the small thickness dimension and large number of pouch cells 1, the liquid cooling plate 4 is mostly located on the aluminum-plastic film sealing side or the tab side of the pouch battery. The surface area of ​​the tab in contact with the interface heat-conducting layer 5 and the cross-sectional area for heat conduction are both small. Although the thermal conductivity of the metal material itself is relatively large, it still limits the heat dissipation efficiency. On the aluminum-plastic film sealing side, the contact area with the interface heat-conducting layer 5 is larger than that on the tab side, but the thermal conductivity of the aluminum-plastic film sealing side itself is small. After folding at the sealing edge, an air gap inevitably exists between the aluminum-plastic film sealing side and the pouch cell 1, resulting in high thermal resistance and low heat dissipation efficiency. In this invention, the bent portion 7 of the heat-conducting plate 6 is set on the aluminum-plastic film sealing side of the pouch cell 1. The heat-conducting plate 6 with the bent portion 7 is used to conduct heat on the large side of the pouch cell 1, and the area of ​​the bent portion 7 is kept as large as possible, thereby improving the heat conduction efficiency and heat conduction effect.

[0044] In this embodiment, as Figure 2 As shown, in a plurality of pouch cells 1, each pair of pouch cells 1 are connected to form a cell unit. A heat-conducting plate 6 is provided between adjacent cell units. The heat-conducting plate 6 has bending portions 7 at both ends. The bending portions 7 contact the interface heat-conducting layer 5, and the heat on the large side of the pouch cell 1 is directly transferred to the heat dissipation component.

[0045] In this embodiment, an aluminum coil with a width of 210mm and a thickness of 0.5mm is placed into a roller press, and the required protrusions 8 are rolled out within a 7.5mm range on both sides of the aluminum coil. After rolling, the aluminum coil is cut into 150mm long aluminum plates, and the aluminum plates are bent at 7.5mm. After bending, the thin sheet is C-shaped, and the protrusions 8 are within the bending range 7. The heat-conducting plate 6 is placed between adjacent battery cells, and the bending range 7 is located on the aluminum-plastic film-sealed side of the soft-pack battery cell 1. The soft-pack battery cell 1 has tabs in the left and right directions. A 1.2mm thick two-component thermally conductive structural adhesive layer 3 is applied to the surface of the heat dissipation component, and multiple battery cells stacked in one direction are placed on the heat dissipation component.

[0046] In another embodiment, such as Figure 6 As shown, multiple pouch cells 1 are arranged in an array along one direction, with a heat-conducting plate 6 and a foam layer 2 between adjacent pouch cells 1; a liquid cooling plate 4 is used to dissipate heat from the pouch cells 1, and there is a 1.5~3mm thick heat-conducting interface layer between the pouch cells 1 and the liquid cooling plate 4; the heat-conducting plate 6 is formed from a 0.5~2mm thick aluminum plate.

[0047] The present invention also provides a pouch cell module, comprising: Multiple pouch cells 1; The above-mentioned heat dissipation structure for soft-pack battery cells.

[0048] Specifically, the soft-pack battery module adopts the above-mentioned soft-pack battery heat dissipation structure. Through the heat-conducting plate 6, a new heat conduction path and heat dissipation area are added to the soft-pack battery 1. The protrusion 8 on the bent part 7 of the heat-conducting plate 6 increases the contact area with the interface heat-conducting layer 5, increases the heat dissipation area, and further compresses the interface heat-conducting layer 5, reducing the distance between it and the heat dissipation component, reducing thermal resistance, and increasing heat dissipation efficiency and heat dissipation.

[0049] The various embodiments of the present invention 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.

Claims

1. A heat dissipation structure for a pouch cell, characterized in that, include: A heat dissipation component, the heat dissipation component being disposed at at least one end of a plurality of pouch cells arranged in a linear stack; An interface thermal conductive layer is disposed between the heat dissipation component and multiple soft-pack battery cells; A heat-conducting plate is disposed between the pouch cells, and at least one end of the heat-conducting plate is provided with a bent portion, which is connected to the side of the interface heat-conducting layer near the plurality of pouch cells.

2. The heat dissipation structure for soft-pack battery cells according to claim 1, characterized in that, The heat dissipation component includes a liquid cooling plate.

3. The heat dissipation structure for the soft-pack battery cell according to claim 1, characterized in that, The interface thermal conductive layer is a compressible thermal conductive pad or a thermal conductive structural adhesive layer.

4. The heat dissipation structure for the soft-pack battery cell according to claim 1, characterized in that, The bending portion is provided with a plurality of protrusions that bulge toward the interface thermal conductive layer.

5. The heat dissipation structure for the soft-pack battery cell according to claim 1, characterized in that, At least some of the pouch cells have a buffer layer between them.

6. The heat dissipation structure for soft-pack battery cells according to claim 5, characterized in that, The buffer layer is a foam layer, and the foam layer is bonded to the soft-pack battery cell.

7. The heat dissipation structure for soft-pack battery cells according to claim 1, characterized in that, The heat-conducting plate is an aluminum plate.

8. The heat dissipation structure for a soft-pack battery cell according to claim 1, characterized in that, At least one large surface of the heat-conducting plate is covered with a graphene film.

9. The heat dissipation structure for a soft-pack battery cell according to claim 1, characterized in that, The bending section is located on the aluminum-plastic film sealing side of the soft-pack battery cell.

10. A soft-pack battery cell module, characterized in that, include: Multiple pouch cells; The heat dissipation structure for the soft-pack battery cell according to any one of claims 1-9.

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