Liquid-cooled battery pack

Abstract

The utility model discloses a liquid-cooled battery pack, and aims to overcome the defects that the heat dissipation capability of the conventional bottom surface heat dissipation scheme is limited, and the conventional bottom surface heat dissipation scheme cannot cope with the temperature rise caused by larger and larger charging and discharging speeds. The battery pack comprises an upper shell, a lower shell, battery cells and a liquid cooling plate, each battery cell is a cylinder with a rectangular cross section, each battery cell is provided with a first surface, a second surface and a third surface according to the size of the area, each second surface is attached to the front surface of the liquid cooling plate, a heat insulation pad is arranged between the first surfaces of the adjacent battery cells, and the battery pack further comprises an auxiliary heat conduction plate, the auxiliary heat conduction plate comprises a heat transfer plate and a heat dissipation plate, the heat transfer plate is attached to the third face, and the heat dissipation plate is attached to the back face of the liquid cooling plate. Heat dissipation of the third surface of the battery cell is increased through the auxiliary heat conduction plate, and the heat dissipation efficiency and the heat dissipation capacity are improved.

Description

Technical Field

[0001] The utility model relates to the field of energy storage, and more specifically, to a liquid-cooled battery pack. Background Art

[0002] As a large-capacity power supply carrier, battery PACK has been widely used in a variety of devices. Under the premise of ensuring safety, high energy density and long service life are the development direction of battery PACK.

[0003] The battery cell will generate heat during the charging and discharging process. High temperature will affect the normal operation of the battery, causing reduced consistency and even fire risks.

[0004] The current mainstream heat dissipation solutions include air cooling and liquid cooling. The air cooling solution requires space for the air duct, and its energy density is lower than that of the liquid cooling solution. The liquid cooling solution is limited by the shape of the battery cell and only dissipates heat on the bottom surface of the battery cell. Using a heat insulation solution on the remaining surfaces has the potential for improvement.

[0005] In summary, the present application aims to provide a liquid-cooled battery pack that can dissipate heat from surfaces other than the bottom surface of the battery cell, increase the heat dissipation area, and thus further improve the heat dissipation capacity. Summary of the invention

[0006] The utility model overcomes the limitation of the heat dissipation capacity of the existing bottom heat dissipation solution and the inability to cope with the temperature increase caused by the increasing charging and discharging speed, and provides a liquid-cooled battery pack, which can dissipate heat from other surfaces other than the bottom surface of the battery cell, increase the heat dissipation area, and thus further improve the heat dissipation capacity.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A liquid-cooled battery pack comprises an upper shell, a lower shell, a battery cell and a liquid cooling plate. The battery cell is a column with a rectangular cross section. According to the size of the area, the battery cell has a first surface, a second surface and a third surface. The second surface is bonded to the front surface of the liquid cooling plate. A thermal insulation pad is provided between the first surfaces of adjacent battery cells. An auxiliary heat conducting plate is also included. The auxiliary heat conducting plate comprises a heat transfer plate and a heat dissipation plate. The heat transfer plate is bonded to the third surface, and the heat dissipation plate is bonded to the back surface of the liquid cooling plate.

[0009] The liquid cooling plate is connected with a water inlet and a water outlet. The low temperature of the liquid cooling plate is maintained by continuously flowing a low-temperature liquid through a pipe between the water inlet and the water outlet. Heat is transferred between the liquid cooling plate and the battery cell, and the liquid cooling plate takes away the heat of the battery cell. The top surface of the battery cell has a pole, and each battery cell has an integrated motherboard. The integrated motherboard connects the poles, connects each battery cell in series, and provides corresponding management functions. The battery cell is a hexahedron, and its top surface is connected to the integrated motherboard as the second surface, and the bottom surface is the second surface bonded to the liquid cooling plate. The high side and the long side of the battery cell constitute the first surface, the wide side and the long side constitute the second surface, and the long side and the wide side constitute the third surface. Among them, the high side is larger than the long side and larger than the wide side, so the area of ​​the first surface is larger than the second surface and larger than the third surface. In order to further improve the heat dissipation capacity of the battery cell, the present application is provided with an auxiliary heat conducting plate, which is bonded to the third surface and introduces heat into the liquid cooling plate. Since the front side of the liquid cooling plate is attached to the second side, the heat dissipation plate of the auxiliary heat conducting plate is attached to the back side of the liquid cooling plate, so that the liquid cooling plate is fully utilized. With the above structure, the heat dissipation capacity can be further improved.

[0010] Preferably, the auxiliary heat conducting plate is U-shaped, and the heat transfer plate is arranged on both sides of the heat dissipation plate, and the angle between the heat transfer plate and the heat dissipation plate is 90 degrees. The auxiliary heat conducting plate provides cooling for both third sides of the battery cell, and can ensure the temperature balance inside the battery cell while expanding the heat dissipation area.

[0011] Preferably, a heat pipe is provided between the heat transfer plate and the heat dissipation plate. The heat pipe has a highly efficient heat conduction capability, and the heat of the heat transfer plate can be efficiently transferred to the heat dissipation plate through the heat pipe.

[0012] Preferably, the heat transfer plate is provided with a positioning rib on a side away from the third side, and the upper shell is provided with a positioning groove, into which the positioning rib is inserted. Through the connection between the positioning rib and the positioning groove, the auxiliary heat conduction plate can improve the rigidity of the battery pack, maintain a certain elasticity, and enhance the mechanical properties of the battery pack.

[0013] Preferably, the heat conducting plate and the liquid cooling plate are integrated into one structure, which further reduces the number of components, increases the contact area between the heat conducting plate and the liquid cooling plate, and makes the heat transfer efficiency higher.

[0014] Preferably, the upper shell is press-fitted onto the heat transfer plate, and the upper shell provides normal pressure to the heat transfer plate, so that the heat transfer plate fully contacts the third surface, thereby improving heat transfer efficiency.

[0015] Preferably, a heat conductive adhesive is provided between the heat transfer plate and the third surface, and between the second surface and the liquid cooling plate. The structure increases the contact area between the second surface, the third surface, the heat transfer plate and the liquid cooling plate for heat transfer, and avoids the situation where the surfaces are not in contact with each other due to surface roughness.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The auxiliary heat conduction plate increases the heat dissipation on the third side of the battery cell, thereby improving the heat dissipation efficiency and heat dissipation capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded view of the utility model;

[0019] In the figure:

[0020] Battery cell 1, liquid cooling plate 2, auxiliary heat conducting plate 3, heat transfer plate 31, heat dissipation plate 32, positioning ribs 33. DETAILED DESCRIPTION

[0021] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0024] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0025] Example:

[0026] A liquid-cooled battery pack comprises an upper shell, a lower shell, a battery cell 1 and a liquid-cooling plate 2. The battery cell 1 is a column with a rectangular cross section. According to the size of the area, the battery cell 1 has a first surface, a second surface and a third surface. The second surface is in contact with the front surface of the liquid-cooling plate 2. A heat insulation pad is provided between the first surfaces of adjacent battery cells 1. Figure 1 As shown, an auxiliary heat conducting plate 3 is also included, and the auxiliary heat conducting plate 3 includes a heat transfer plate 31 and a heat dissipation plate 32 . The heat transfer plate 31 is attached to the third surface, and the heat dissipation plate 32 is attached to the back surface of the liquid cooling plate 2 .

[0027] The auxiliary heat conducting plate 3 is in a U-shape, and the heat transfer plate 31 is arranged on both sides of the heat dissipation plate 32, and the angle between the heat transfer plate 31 and the heat dissipation plate 32 is 90 degrees. The auxiliary heat conducting plate 3 provides cooling for both third surfaces of the battery core 1, and can ensure the temperature balance inside the battery core 1 while expanding the heat dissipation area. A heat pipe is arranged between the heat transfer plate 31 and the heat dissipation plate 32. The heat pipe has a high efficiency in heat conduction, and the heat of the heat transfer plate 31 can be efficiently transferred to the heat dissipation plate 32 through the heat pipe.

[0028] The heat transfer plate 31 is provided with a positioning rib 33 on the side away from the third side, and the upper shell is provided with a positioning groove, and the positioning rib 33 is inserted into the positioning groove. Through the connection between the positioning rib 33 and the positioning groove, the auxiliary heat conductive plate 3 can improve the rigidity of the battery pack, maintain a certain elasticity, and enhance the mechanical properties of the battery pack. The upper shell is pressed onto the heat transfer plate 31, providing pressure for the heat transfer plate 31 so that the heat transfer plate 31 abuts. The upper shell provides normal pressure on the heat transfer plate 31, so that the heat transfer plate 31 fully contacts the third side, thereby improving the heat transfer efficiency.

[0029] In some embodiments, the heat conducting plate and the liquid cooling plate 2 are integrated into one structure, which further reduces the number of components, increases the contact area between the heat conducting plate and the liquid cooling plate 2, and improves the heat transfer efficiency.

[0030] Thermal conductive glue is provided between the heat transfer plate 31 and the third surface, and between the second surface and the liquid cooling plate 2. The structure increases the contact area between the second surface, the third surface, the heat transfer plate 31 and the liquid cooling plate 2 for heat transfer, and avoids the situation where the surfaces are not in contact with each other due to surface roughness.

[0031] The liquid cooling plate 2 is connected with a water inlet and a water outlet. The low temperature of the liquid cooling plate 2 is maintained by continuously flowing a low-temperature liquid through the pipe between the water inlet and the water outlet. Heat is transferred between the liquid cooling plate 2 and the battery cell 1, and the liquid cooling plate 2 takes away the heat of the battery cell 1. The top surface of the battery cell 1 has a pole, and each battery cell 1 has an integrated motherboard. The integrated motherboard connects the poles, connects each battery cell 1 in series, and provides corresponding management functions. The battery cell 1 is a hexahedron, and its top surface is connected to the integrated motherboard as the second surface, and the bottom surface is the second surface bonded to the liquid cooling plate 2. The high side and the long side of the battery cell 1 constitute the first surface, the wide side and the long side constitute the second surface, and the long side and the wide side constitute the third surface. Among them, the high side is larger than the long side and larger than the wide side, so the area of ​​the first surface is larger than the second surface and larger than the third surface. In order to further improve the heat dissipation capacity of the battery cell 1, the present application is provided with an auxiliary heat conducting plate 3, and the auxiliary heat conducting plate 3 is bonded to the third surface and introduces heat into the liquid cooling plate 2. Since the front surface of the liquid cooling plate 2 is attached to the second surface, the heat dissipation plate 32 of the auxiliary heat conducting plate 3 is attached to the back surface of the liquid cooling plate 2 to fully utilize the liquid cooling plate 2. With the above structure, the heat dissipation capacity can be further improved.

[0032] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A liquid-cooled battery pack, comprising an upper shell, a lower shell, a battery cell and a liquid cooling plate, wherein the battery cell is a column with a rectangular cross section, and according to the size of the area, the battery cell has a first surface, a second surface and a third surface, the second surface is in contact with the front surface of the liquid cooling plate, and a heat insulation pad is provided between the first surfaces of adjacent battery cells, wherein: An auxiliary heat conducting plate is also included, and the auxiliary heat conducting plate includes a heat transfer plate and a heat dissipation plate. The heat transfer plate is attached to the third surface, and the heat dissipation plate is attached to the back surface of the liquid cooling plate.

2. A liquid-cooled battery pack according to claim 1, characterized in that: The auxiliary heat conducting plate is in a U shape, and the heat transfer plate is arranged on both sides of the heat dissipation plate, and the angle between the heat transfer plate and the heat dissipation plate is 90 degrees.

3. A liquid-cooled battery pack according to claim 2, characterized in that: A heat pipe is arranged between the heat transfer plate and the heat dissipation plate.

4. The liquid-cooled battery pack according to claim 1, characterized in that: The heat transfer plate is provided with a positioning rib on a side away from the third side, and the upper shell is provided with a positioning groove, and the positioning rib is inserted into the positioning groove.

5. The liquid-cooled battery pack according to claim 1, characterized in that: The heat conduction plate and the liquid cooling plate are an integrated structure.

6. A liquid-cooled battery pack according to claim 4, characterized in that: The upper shell is pressed onto the heat transfer plate.

7. A liquid-cooled battery pack according to any one of claims 1 to 6, characterized in that: Thermal conductive glue is provided between the heat transfer plate and the third surface, and between the second surface and the liquid cooling plate.

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