Cooling plate, battery pack and vehicle

Abstract

The utility model relates to the technical field of power batteries, in particular to a cooling plate, a battery pack and a vehicle, the cooling plate comprises a main body and an extension part along the height direction, the first end of the extension part is connected with the main body, and the second end of the extension part is used for being in contact with a battery pack box body; and a flow channel for cooling liquid to circulate is arranged in the main body. The cooling plate provided by the utility model not only can realize a heat management effect, but also can improve the space utilization rate in the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically provides a cooling plate, a battery pack and a vehicle. Background Art

[0002] At present, with the rapid development of the new energy industry, new energy equipment such as electric vehicles and electric aircraft have been widely used, and battery packs as the core part of new energy equipment have also been widely concerned. The mainstream battery packs now generally have square shell battery cells, cylindrical battery cells or soft pack battery cells. Power batteries are extremely sensitive to temperature changes. The temperature environment in the battery pack has a great impact on the reliability, life and performance of the battery cell. Battery thermal management has become an important guarantee for the operation of new energy vehicles.

[0003] In order to perform thermal management on the battery pack, a cooling plate can be provided between two rows of battery cells in the battery pack to heat or cool the battery cells. The cooling plate is generally bonded to the battery cells by thermally conductive adhesive, and then the cooling plate and the battery cells are placed in the battery pack box.

[0004] However, after research, the applicant found that the existing cooling plate can only achieve the function of thermal management and needs other fixing devices. In order to prevent the battery cells from directly contacting the battery pack body, other structures are needed to support the battery cells. These structures occupy the space inside the pack, resulting in low space utilization inside the battery pack.

[0005] Therefore, this field needs a new design to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the technical problem that the whole package space utilization rate of a cylindrical battery pack is low.

[0007] In a first aspect, the utility model provides a cooling plate, which includes a main body and an extension portion along a height direction, wherein a first end of the extension portion is connected to the main body, a second end of the extension portion is used to contact a battery pack case, and a flow channel for circulating a cooling liquid is provided inside the main body.

[0008] Optionally, the height of the extension portion is 1 mm to 50 mm.

[0009] Optionally, the height of the extension portion is 1 mm to 15 mm.

[0010] Optionally, the main body includes a plurality of arc segments, and the arc segments match the side shape of the cylindrical battery cell.

[0011] In a second aspect, the utility model further provides a battery pack, comprising a box body, a plurality of battery cells and a cooling plate as described above, wherein the battery cells and the cooling plate are arranged in the box body, the main body of the cooling plate is arranged between two rows of battery cells, and the extension portion extends from the main body to the outside of the two rows of battery cells.

[0012] Optionally, the extension portion is close to a pressure relief mechanism of the battery cell.

[0013] Optionally, the second end of the extension portion is in contact with the battery pack case, and a pressure relief channel is formed between the battery cell, the battery pack case and the extension portions of two adjacent cooling plates.

[0014] Optionally, the second end of the extension portion is in contact with the battery pack case through a buffer.

[0015] Optionally, the second end of the extension portion is clamped on the buffer component.

[0016] In a third aspect, the utility model further provides a vehicle, comprising a battery pack as described in any one of the above.

[0017] In the case of adopting the above technical solution, the cooling plate provided by the present application can not only achieve the function of thermal management, but also the extension of the cooling plate can directly contact the battery pack body, and the battery cell can be fixed on the cooling plate by means of thermal conductive glue or the like. No other additional structure is required to support the battery cell, but the battery cell can be set in the battery pack body through the extension of the cooling plate. In this way, the space utilization rate in the battery pack can be improved.

[0018] Furthermore, the extension portion is close to the pressure relief mechanism of the battery cell, wherein the pressure relief mechanism is a component of the battery cell with a pressure relief function, such as an explosion-proof valve.

[0019] Furthermore, the extension portion extends to the outside of the two rows of battery cells, so that the two rows of battery cells can be separated, thereby preventing thermal runaway of one row of battery cells from affecting the other row of battery cells.

[0020] Furthermore, the height direction of the extension part is consistent with the height direction of the cylindrical battery cell. The height of the extension part and the height of the cylindrical battery cell meet a certain ratio, so that after the extension part is bonded to the cylindrical battery cell, it can provide sufficient support for the cylindrical battery cell and ensure effective thermal runaway protection.

[0021] Furthermore, the second end of the extension part contacts the battery pack case, and a pressure relief channel is formed between the battery cell, the battery pack case and the extension parts of two adjacent cooling plates. When thermal runaway occurs in the battery cell, high-temperature gas and leaked materials can be discharged out of the battery pack through the pressure relief channel, thereby effectively preventing the thermal runaway from spreading. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0023] Figure 1 A schematic diagram of a first cooling plate provided by the utility model;

[0024] Figure 2 A schematic diagram of various components in a battery pack provided by the utility model;

[0025] Figure 3 A schematic diagram of a second cooling plate provided by the utility model;

[0026] Figure 4 A schematic diagram of a third cooling plate provided by the utility model;

[0027] Figure 5 A schematic diagram of a fourth cooling plate provided by the utility model;

[0028] Figure 6 A top view of the components in another battery pack provided by the utility model.

[0029] List of reference numerals:

[0030] 10. Cooling plate; 11. Main body of cooling plate; 12. Extension portion of cooling plate; 121. First end of extension portion of cooling plate; 122. Second end of extension portion of cooling plate; 13. Water inlet or outlet of cooling plate; 14. Fixing portion of cooling plate; 20. Battery cell; 30. Battery pack body; x. Height direction of cooling plate 10; 40. Pressure relief channel; 50. Buffer. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0032] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "top", "bottom" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The following combination Figures 1 to 5 To illustrate the separator plate, battery pack and vehicle for cylindrical batteries provided by the utility model. Figure 1 A schematic diagram of a first cooling plate provided by the utility model;

[0035] Figure 2 A schematic diagram of various components in a battery pack provided by the utility model; Figure 3 A schematic diagram of a second cooling plate provided by the utility model; Figure 4 A schematic diagram of a third cooling plate provided by the utility model; Figure 5 A schematic diagram of a fourth cooling plate provided by the utility model; Figure 6 A top view of the components in another battery pack provided by the utility model.

[0036] First, see Figure 1 , with the dotted line as the boundary, along the height direction x, the upper half of the cooling plate 10 is the main body 11, and the lower half is the extension 12. The first end 121 of the extension 12 is connected to the main body 11, and the second end 122 of the extension 12 is used to contact the battery pack box 30. The main body 11 is provided with a flow channel for the circulation of the coolant.

[0037] See also Figures 3 to 5 , which provides three ways of setting the extension portion 12.

[0038] Figure 3 A flow channel for the circulation of the coolant is also provided inside the extension portion 12, thereby increasing the cooling area of ​​the cooling plate 10 and improving the thermal management efficiency.

[0039] Figure 4The extension part 12 is provided with no flow channel inside to prevent the extension part from being damaged by external impact. The extension part 12 is a solid structure, which can improve the mechanical properties of the extension part 12.

[0040] Figure 5 The extension part 12 is provided with no flow channel inside to prevent the extension part from being damaged by external impact. The extension part 12 is a hollow structure, which can effectively reduce the weight of the cooling plate 12.

[0041] Optionally, the two sides of the cooling plate 10 are in contact with the sides of the battery cell 20, and the battery cell 20 can be heated or cooled by heating or cooling the coolant in the cooling plate to adjust the temperature of the battery cell 20. Optionally, the cooling plate 10 and the battery cell 20 are connected by glue (such as thermally conductive glue, double-sided tape, etc.) to improve the heat transfer efficiency.

[0042] Optionally, the end of the cooling plate may include a water inlet or outlet 13, which is used to connect to a main water pipe in the battery pack to realize a coolant circulation loop in the battery pack.

[0043] Optionally, the end of the cooling plate may further include a fixing portion 14 , which is used to be fixedly connected to the battery pack case 30 .

[0044] Specifically, the cooling plate 10 and the battery pack box 30 can be connected by at least one of the following connection methods: threaded connection, flange connection, welding, groove connection (clamp connection), sleeve connection, press connection, and adhesive connection. Correspondingly, the fixing portion 14 may include any structure for realizing the above connection methods. In a specific embodiment, as Figure 1 As shown, the cooling plate 10 is connected to the battery pack body 30 by threads, and the fixing portion 14 includes a stud for realizing the threaded connection, which is fixedly connected to the battery pack body 30 by screws or bolts.

[0045] The cooling plate 10 provided in the present application can not only realize the heat management function, but also the extension part 12 of the cooling plate 10 can directly contact with the battery pack box 30, and the battery cell 20 can be fixed on the cooling plate 10 by means of heat conductive glue or the like. No other additional structure is required to support the battery cell 20, but the battery cell 20 can be arranged in the battery pack box 20 through the extension part of the cooling plate 10. In this way, the space utilization rate in the battery pack can be improved.

[0046] Optionally, the battery cell 20 may be one or more of a square-shell battery cell, a cylindrical battery cell or a soft-pack battery cell.

[0047] In one embodiment, when the battery cell 20 is a cylindrical battery cell, the main body 11 includes a plurality of arc segments (such as Figure 1As shown in FIG. 1 , the arc segment matches the side shape of the cylindrical battery cell 20. Thus, the two rows of cylindrical battery cells 20 can be heated or cooled by the cooling plate 10 between the two rows of cylindrical battery cells 20. The main body 11 and the side shape of the cylindrical battery 20 can be matched and fit tightly, which can effectively reduce the space occupied in the package and improve the space utilization rate in the package.

[0048] Second, see Figure 2 and Figure 3 The utility model also provides a battery pack, which includes a box body 30, a plurality of battery cells 20 (taking cylindrical battery cells as an example) and the above-mentioned cooling plate 10, wherein the battery cells 20 and the cooling plate 10 are arranged in the box body 30, the main body 11 of the cooling plate 10 is arranged between two rows of battery cells 20, and the extension portion 12 extends from the main body 11 to the outside of the two rows of battery cells 20. Thus, one end of the extension portion 12 extending to the outside of the battery cell 20, that is, the second end 122 of the extension portion 12 can contact or connect with other structures in the battery pack.

[0049] In a specific embodiment, the second end 122 of the extension 12 can be in contact with or connected to the box body 30. Optionally, the box body 30 includes a lower box body 31 formed by a plurality of side beams, an upper box cover, and a bottom plate 32. In a preferred embodiment, the second end 122 of the extension 12 can be in contact with or connected to the upper box cover or the bottom plate 32.

[0050] In one embodiment, the extension portion 12 is close to the pressure relief mechanism 21 of the battery cell 20. The pressure relief mechanism 21 is a component of the battery cell 20 with a pressure relief function, such as an explosion-proof valve. The extension portion 12 extends to the outside of the two rows of battery cells 20, which can separate the two rows of battery cells 20 to prevent thermal runaway of one row of battery cells 20 from affecting the other row of battery cells 20.

[0051] The height of the cylindrical battery cell 20 is 80 mm to 120 mm. Preferably, the height of the cylindrical battery cell 20 is 80 mm, 90 mm, 95 mm, 105 mm or 120 mm.

[0052] In one embodiment, the height of the extension portion 12 (ie Figure 1 The dimension of h in the figure is 1 mm to 50 mm. In a preferred embodiment, the height of the extension portion 12 is 1 mm to 30 mm. In a preferred embodiment, the height of the extension portion 12 extending to the outside of the battery cell 20 is 10 to 30 mm.

[0053] The height direction of the extension portion 12 is consistent with the height direction of the cylindrical battery cell 20. The height of the extension portion 12 and the height of the cylindrical battery cell 20 meet a certain ratio, so that after the extension portion 12 is bonded to the cylindrical battery cell 20, it can provide sufficient support for the cylindrical battery cell 20 and ensure effective thermal runaway protection.

[0054] In one embodiment, see Figure 2 The second end 122 of the extension portion 12 contacts the battery pack case 30, and the battery cell 20 and the battery pack case 30 ( Figure 2 A pressure relief channel 40 is formed between the extension portions 12 of two adjacent cooling plates 10 (taking the bottom plate 32 as an example).

[0055] When thermal runaway occurs in the battery cell 20 , high-temperature gas and leaked materials can be discharged out of the battery pack through the pressure relief channel 40 , thereby effectively preventing the thermal runaway from spreading.

[0056] Optionally, the second end 122 of the extension 12 contacts the battery pack case 30 via a buffer. The buffer 50 may be a component with a buffering effect such as foam or a silicone pad. Thus, the cooling plate 10 can be prevented from directly contacting the battery pack case 30, thereby preventing the impact on the battery pack case 30 from being directly transmitted to the cooling plate 10, causing deformation or even damage to the cooling plate 10.

[0057] In a specific embodiment, the second end 122 of the extension portion 12 is clamped on the buffer 50. Specifically, an opening may be provided on the buffer, and the second end 122 of the extension portion 12 is clamped in the opening, so that the extension portion 12 is fixed on the buffer 50.

[0058] In a third aspect, the utility model further provides a vehicle, and the vehicle of the utility model includes the above-mentioned battery pack.

[0059] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0060] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A cooling plate, characterized in that: The cooling plate includes a main body and an extension portion along the height direction, a first end of the extension portion is connected to the main body, a second end of the extension portion is used to contact the battery pack body, and a flow channel for the circulation of cooling liquid is provided inside the main body.

2. The cooling plate according to claim 1, characterized in that The height of the extension portion is 1 mm to 50 mm.

3. The cooling plate according to claim 2, characterized in that The height of the extension portion is 1 mm to 15 mm.

4. The cooling plate according to claim 1, characterized in that The main body includes a plurality of arc segments, and the arc segments match the side shapes of the cylindrical battery cells.

5. A battery pack, characterized in that: The battery pack includes a box body, a plurality of battery cells and a cooling plate as described in any one of claims 1 to 4, wherein the battery cells and the cooling plate are arranged in the box body, the main body of the cooling plate is arranged between two rows of battery cells, and the extension portion extends from the main body to the outside of the two rows of battery cells.

6. The battery pack according to claim 5, characterized in that: The extension portion is close to the pressure relief mechanism of the battery cell.

7. The battery pack according to claim 5 or 6, characterized in that: The second end of the extension portion contacts the battery pack case, and a pressure relief channel is formed between the battery cell, the battery pack case and the extension portions of two adjacent cooling plates.

8. The battery pack according to claim 7, characterized in that: The second end of the extension portion contacts the battery pack case through a buffer.

9. The battery pack according to claim 8, characterized in that: The second end of the extending portion is clamped on the buffer component.

10. A vehicle, characterized in that: The vehicle comprises a battery pack as claimed in any one of claims 5 to 9.

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