Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle. The battery pack comprises a runner plate and a battery pack, and the module is located on one side of the runner plate in the thickness direction, and at least part of the cooling runner is defined between the module and the runner plate. According to the battery pack provided by the utility model, the module is positioned on one side of the runner plate in the thickness direction, and at least part of the cooling runner is defined between the module and the runner plate, so that the module is in direct contact with the cooling liquid for heat exchange, the heat conduction path is shortened, and the heat resistance of the heat conduction path is only the heat conduction resistance of the battery cell; therefore, the heat transfer efficiency is effectively improved, the battery pack meets the cooling requirement of the quick charging working condition, and the reliability and safety of the battery pack are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and a vehicle. Background Art

[0002] The heat conduction path of a traditional battery pack usually goes from the battery cells through the thermal conductive adhesive and the liquid cooling plate to the coolant. The thermal resistance of the heat conduction path is mainly composed of the thermal conductive resistance of the battery cells themselves, the thermal conductive resistance between the battery cells and the thermal conductive adhesive, the thermal conductive resistance between the thermal conductive adhesive and the liquid cooling plate, and the convective heat transfer resistance between the coolant and the liquid cooling plate. The thermal resistance of this heat conduction path is large and the transfer path is long, resulting in low heat transfer efficiency and being unfavorable for meeting the cooling requirements of relatively strict fast charging conditions. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery pack, which enables the module to directly contact the coolant for heat exchange, improves the heat transfer efficiency, and enables the battery pack to meet the cooling requirements of fast charging conditions.

[0004] The utility model also provides a vehicle, which includes the above-mentioned battery pack.

[0005] The battery pack according to the embodiment of the utility model includes: a flow channel plate; a module, which is located on one side in the thickness direction of the flow channel plate, and at least part of the cooling flow channel is defined between the module and the flow channel plate.

[0006] For the battery pack according to the embodiment of the utility model, by the module being located on one side in the thickness direction of the flow channel plate, at least part of the cooling flow channel is defined between the module and the flow channel plate, realizing direct heat exchange between the module and the coolant, thereby shortening the heat conduction path, and the thermal resistance of the heat conduction path is only the thermal conductive resistance of the battery cells themselves, thus effectively improving the heat transfer efficiency, further enabling the battery pack to meet the cooling requirements of fast charging conditions, and improving the reliability and safety of the battery pack.

[0007] In some embodiments of the utility model, the module includes a plurality of battery cells stacked along a first direction, the cooling flow channel includes a main cooling channel extending along the first direction, the main cooling channels are multiple and spaced apart along a second direction, the first direction, the second direction and the thickness direction of the flow channel plate are perpendicular to each other pairwise, and at least part of the main cooling flow channel is defined between the module and the flow channel plate.

[0008] In some embodiments of the utility model, the cooling flow channel further includes a connecting flow channel, the connecting flow channel extends along the second direction and is used for connecting multiple main cooling channels.

[0009] In some embodiments of the present utility model, the connecting flow channel is located in a region outside the region where the flow channel plate faces the module.

[0010] In some embodiments of the present utility model, the battery pack further includes: an expansion beam, at least one side of the expansion beam along the first direction is provided with the battery cells, and the expansion beam extends along the second direction and is connected to the flow channel plate.

[0011] In some embodiments of the present utility model, the surface of the flow channel plate facing the module has a recessed portion recessed away from the module, and at least part of the inner wall of the recessed portion and the surface of the module facing the flow channel plate jointly define at least part of the cooling flow channel.

[0012] In some embodiments of the present utility model, part of the recessed portion is located in a region outside the region where the flow channel plate faces the module, and the battery pack further includes: a cover plate, the cover plate is located on one side of the module and is connected to the flow channel plate, and the cooling flow channel is jointly defined between the cover plate and the inner wall of the recessed portion and between the module and the inner wall of the recessed portion.

[0013] In some embodiments of the present utility model, the module is connected to the flow channel plate by welding or bonding with structural adhesive.

[0014] In some embodiments of the present utility model, the module is connected to the flow channel plate by fasteners and there is a sealing ring between the flow channel plate and the module.

[0015] A vehicle according to an embodiment of the present utility model includes the above-mentioned battery pack.

[0016] For a vehicle according to an embodiment of the present utility model, a battery pack is provided. By arranging the module on one side in the thickness direction of the flow channel plate, at least part of the cooling flow channel is defined between the module and the flow channel plate, so that the module is directly in contact with the coolant for heat exchange, thereby shortening the heat conduction path, and the thermal resistance of the heat conduction path is only the thermal conduction resistance of the battery cell itself, thus effectively improving the heat transfer efficiency, and further enabling the battery pack to meet the cooling requirements under fast charging conditions, and improving the reliability and safety of the vehicle.

[0017] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a structural diagram of a battery pack according to an embodiment of the present utility model;

[0020] Figure 2 is a top view of a battery pack according to an embodiment of the present utility model;

[0021] Figure 3 is along Figure 2 a sectional view taken along line A-A in

[0022] Figure 4 is Figure 3 an enlarged view of portion C in

[0023] Figure 5 is along Figure 3 a sectional view taken along line B-B in

[0024] Figure 6 is Figure 5 an enlarged view of portion D in

[0025] Figure 7 is a top view of a flow channel plate according to an embodiment of the present utility model;

[0026] Figure 8 is Figure 7 an enlarged view of portion E in

[0027] Reference numerals:

[0028] 100, battery pack;

[0029] 1, flow channel plate; 11, recessed portion; 12, liquid inlet; 13, liquid outlet;

[0030] 2, module; 21, battery cell;

[0031] 3, cooling flow channel; 31, main cooling flow channel; 32, connecting flow channel;

[0032] 4, expansion beam;

[0033] 5, cover plate. Detailed Description of the Embodiment

[0034] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 thus cannot be construed as a limitation on the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] The battery pack 100 according to an embodiment of the present utility model will be described below with reference to the drawings.

[0038] As Figures 1-8 shown, the battery pack 100 according to an embodiment of the present utility model includes a flow channel plate 1 and a module 2. Among them, the module 2 is located on one side in the thickness direction of the flow channel plate 1 (the third direction as Figure 3 shown), and at least part of the cooling flow channel 3 is defined between the module 2 and the flow channel plate 1.

[0039] It can be understood that the coolant is located in the cooling flow channel 3, and at least part of the cooling flow channel 3 is defined between the module 2 and the flow channel plate 1. Thus, through such a setting, the module 2 is directly in contact with the coolant for heat exchange, thereby shortening the heat conduction path, effectively improving the heat transfer efficiency, and further meeting the rapid cooling requirement of the battery pack 100. At the same time, since the module 2 is directly in contact with the coolant for heat exchange, the thermal resistance of the heat conduction path is only the thermal conduction resistance of the battery cell 21 itself, further improving the heat transfer efficiency, enabling the battery pack 100 to meet the cooling requirement of the fast charging condition, and improving the reliability and safety of the battery pack 100.

[0040] According to the battery pack 100 of the embodiments of the present utility model, the module 2 is located on one side of the thickness direction of the flow channel plate 1, and at least part of the cooling flow channel 3 is defined between the module 2 and the flow channel plate 1, so that the module 2 is directly in contact with the coolant for heat exchange, thereby shortening the heat conduction path, and the thermal resistance of the heat conduction path is only the thermal conduction resistance of the battery cell 21 itself, thereby effectively improving the heat transfer efficiency, and further enabling the battery pack 100 to meet the cooling requirements of the fast charging condition, and improving the reliability and safety of the battery pack 100.

[0041] In some embodiments of the present utility model, as Figures 1-8 shown, the module 2 includes a plurality of battery cells 21 stacked along a first direction, the cooling flow channel 3 includes a main cooling channel extending along the first direction, the main cooling channels are multiple and spaced apart along a second direction, the first direction, the second direction and the thickness direction of the flow channel plate 1 are perpendicular to each other in pairs, and at least part of the main cooling flow channel 31 is defined between the module 2 and the flow channel plate 1.

[0042] It can be understood that during the process of stacking a plurality of battery cells 21 to form the module 2, there are certain gaps between the plurality of battery cells 21. During the charging and discharging process of the battery cells 21, since the battery cells 21 will expand, the gaps between adjacent battery cells 21 will disappear. Therefore, in the present application, the cooling process of the battery cells 21 occurs when the battery cells 21 expand. The plurality of battery cells 21 are stacked along the first direction, and the main cooling channels are multiple and spaced apart along the second direction. By the fact that the gaps between adjacent battery cells 21 will disappear when the battery cells 21 expand, it is ensured that the coolant in the main cooling flow channel 31 will not leak, and the reliability of the battery pack 100 is improved.

[0043] Therefore, through such a setting, each of the plurality of battery cells 21 is directly in contact with the coolant in the plurality of main cooling channels for heat exchange, thereby realizing rapid cooling and temperature reduction of the plurality of battery cells 21. At the same time, by stacking the plurality of battery cells 21 along the first direction and the main cooling channels being multiple and spaced apart along the second direction, it is ensured that each battery cell 21 can obtain a sufficient and relatively uniform cooling effect, which helps to reduce the temperature difference between the battery cells 21 and improve the stability and safety of the battery pack 100.

[0044] In some embodiments of the present utility model, as Figures 4-8 shown, the cooling flow channel 3 further includes a connecting flow channel 32, the connecting flow channel 32 extends along the second direction and is used to connect the plurality of main cooling flow channels 31. Therefore, through the connecting flow channel 32, the plurality of main cooling flow channels 31 are connected, and the coolant can be evenly distributed between each main cooling flow channel 31, the cooling flow channel 3 is reasonably arranged, the pressure loss during the flow of the coolant is reduced, and the heat exchange efficiency is improved.

[0045] In some embodiments of the present utility model, as Figure 4As shown, the connecting flow channel 32 is located in a region outside the region where the flow channel plate 1 and the module 2 face each other. It can be understood that since the connecting flow channel 32 is designed to enable the coolant to flow smoothly between each main cooling flow channel 31, and the extending direction of the connecting flow channel 32 is perpendicular to the arrangement direction of the plurality of battery cells 21, by the connecting flow channel 32 being located in a region outside the region where the flow channel plate 1 and the module 2 face each other, it further ensures that each battery cell 21 can obtain sufficient and relatively uniform cooling effect, which helps to reduce the temperature difference between the battery cells 21 and improve the stability and safety of the battery pack 100.

[0046] In some embodiments of the present utility model, as Figure 8 shown, the flow channel plate 1 has an inlet 12 and an outlet 13, and the inlet 12 and the outlet 13 are respectively communicated with the connecting flow channel 32. Thus, the coolant enters the connecting flow channel 32 through the inlet 12, flows to the plurality of main cooling flow channels 31 to exchange heat with the battery cells 21, then flows to the connecting flow channel 32 again, and flows out from the outlet 13, further improving the cooling effect on the module 2.

[0047] In some embodiments of the present utility model, as Figure 1 、 Figure 3 and Figure 4 shown, the battery pack 100 further includes an expansion beam 4. Wherein, at least one side of the expansion beam 4 along the first direction is provided with the battery cells 21, and the expansion beam 4 is located along the second direction and is connected to the flow channel plate 1.

[0048] It can be understood that since both the expansion beam 4 and the battery cells 21 extend along the second direction, and at least one side of the expansion beam 4 along the first direction is provided with the battery cells 21, so that the expansion beam 4 can effectively fix and position the battery cells 21, ensuring the stable position of the battery cells 21 in the battery pack 100. And when the battery cells 21 generate a certain amount of expansion during the charging and discharging process, the expansion beam 4 can bear this expansion force, preventing the battery cells 21 from being damaged or causing safety problems due to excessive expansion, thereby improving the reliability and safety of the battery pack 100. At the same time, by connecting the expansion beam 4 with the flow channel plate 1, the sealing performance of each main cooling flow channel 31 is ensured, avoiding the coolant from flowing out of the main cooling flow channel 31, and improving the reliability of the battery pack 100.

[0049] Furthermore, the expansion beam 4 is one or a plurality spaced apart along the first direction. Thus, the battery pack 100 can be flexibly configured according to different capacity requirements, meeting the requirements of battery packs 100 with different capacities to adapt to different application scenarios and improve the versatility.

[0050] In some embodiments of the present utility model, as Figures 1-8As shown in the figure, the surface of the flow channel plate 1 facing the module 2 has a recessed portion 11 recessed away from the module 2, and at least a part of the inner wall of the recessed portion 11 and the surface of the module 2 facing the flow channel plate 1 jointly define at least a part of the cooling flow channel 3.

[0051] Thus, at least a part of the inner wall of the recessed portion 11 and the surface of the module 2 facing the flow channel plate 1 jointly define at least a part of the cooling flow channel 3, so that the cooling flow channel 3 defined by the recessed portion 11 and the module 2 has a certain depth, increasing the capacity of the coolant in the cooling flow channel 3, thereby improving the cooling effect of the coolant on the module 2. At the same time, the part of the flow channel plate 1 without the recessed portion 11 plays a certain supporting role for the module 2, improving the reliability of the battery pack 100.

[0052] Further, the module 2 includes a plurality of battery cells 21 stacked in the first direction, the cooling flow channel 3 includes main cooling channels extending in the first direction, and the main cooling channels are multiple and spaced apart in the second direction. The first direction, the second direction, and the thickness direction of the flow channel plate 1 are perpendicular to each other in pairs. At least a part of the inner wall of the recessed portion 11 and the surface of each battery cell 21 facing the flow channel plate 1 jointly define at least a part of the main cooling flow channel 31 of the cooling flow channel 3. It can be understood that the recessed portion 11 is not multiple and spaced apart in the second direction. Thus, the part of the flow channel plate 1 without the recessed portion 11 plays a certain supporting role for each battery cell 21, thereby improving the reliability of the entire battery pack 100.

[0053] In some embodiments of the present invention, as Figures 1-8 shown, a part of the recessed portion 11 is located in an area outside the area where the flow channel plate 1 and the module 2 face each other, and the battery pack 100 further includes a cover plate 5. Among them, the cover plate 5 is located on one side of the module 2 and is connected to the flow channel plate 1. The cover plate 5 and the inner wall of the recessed portion 11 and the module 2 and the inner wall of the recessed portion 11 jointly define the cooling flow channel 3. Thus, through such a setting, the sealing performance of the cooling flow channel 3 is ensured, effectively avoiding the leakage of the coolant from the cooling flow channel 3 and improving the cooling effect on the module 2.

[0054] Further, the module 2 includes a plurality of battery cells 21 stacked in the first direction, the cooling flow channel 3 includes main cooling channels extending in the first direction and connecting channels 32, the main cooling channels are multiple and spaced apart in the second direction. The first direction, the second direction, and the thickness direction of the flow channel plate 1 are perpendicular to each other in pairs. At least a part of the inner wall of the recessed portion 11 and the surfaces of each battery cell 21 and the cover plate 5 facing the flow channel plate 1 jointly define the cooling flow channel 3.

[0055] In some embodiments of the present utility model, the module 2 is connected to the flow channel plate 1 by welding or bonding with structural adhesive. Thus, through such an arrangement, the connection between the module 2 and the flow channel plate 1 is realized, thereby ensuring the sealing performance of the cooling flow channel 3 defined between the module 2 and the flow channel plate 1 and improving the reliability of the battery pack 100.

[0056] Meanwhile, the welding connection between the module 2 and the flow channel plate 1 has good firmness and seismic resistance, preventing the module 2 and the flow channel plate 1 from loosening due to heavy load, vibration or temperature change, thereby effectively enhancing the structural strength and stability of the battery pack 100. And the cost of bonding the module 2 and the flow channel plate 1 with structural adhesive is relatively low, and the assembly is simple, reducing the assembly efficiency. Therefore, the connection mode between the module 2 and the flow channel plate 1 can be selected according to different scenarios of the application of the battery pack 100 to improve the versatility.

[0057] In some embodiments of the present utility model, the cover plate 5 is connected to the flow channel plate 1 by welding or bonding with structural adhesive. Thus, through such an arrangement, the connection between the cover plate 5 and the flow channel plate 1 is realized, thereby ensuring the sealing performance of the cooling flow channel 3 defined between the cover plate 5 and the flow channel plate 1 and improving the reliability of the battery pack 100.

[0058] In some embodiments of the present utility model, the module 2 is connected to the flow channel plate 1 by fasteners and there is a sealing ring between the flow channel plate 1 and the module 2. Thus, the connection between the cover plate 5 and the flow channel plate 1 is realized through the fasteners, and the sealing performance between the cover plate 5 and the flow channel plate 1 is realized through the sealing ring, improving the reliability of the battery pack 100.

[0059] The vehicle according to the embodiments of the present utility model will be described below.

[0060] The vehicle according to the embodiments of the present utility model includes a battery pack 100.

[0061] For the vehicle according to the embodiments of the present utility model, a battery pack 100 is provided. By arranging the module 2 on one side in the thickness direction of the flow channel plate 1, at least part of the cooling flow channel 3 is defined between the module 2 and the flow channel plate 1, enabling the module 2 to directly contact the coolant for heat exchange, thereby shortening the heat conduction path, and the thermal resistance of the heat conduction path is only the thermal conductivity resistance of the battery cell 21 itself, thus effectively improving the heat transfer efficiency, and further enabling the battery pack 100 to meet the cooling requirements of the fast charging condition and improving the reliability and safety of the vehicle.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Flow channel plate (1); A module (2), the module (2) being located on one side of the flow channel plate (1) in a thickness direction, and at least a portion of a cooling flow channel (3) being defined between the module (2) and the flow channel plate (1).

2. The battery pack according to claim 1, characterized in that: The module (2) comprises a plurality of battery cells (21) stacked along a first direction, the cooling channel (3) comprises a main cooling channel extending along the first direction, the main cooling channels are a plurality of channels spaced apart along a second direction, the first direction, the second direction and the thickness direction of the channel plate (1) are perpendicular to each other, and at least a portion of the main cooling channel (31) is defined between the module (2) and the channel plate (1).

3. The battery pack according to claim 2, characterized in that: The cooling flow channel (3) further comprises a connecting flow channel (32), wherein the connecting flow channel (32) extends along the second direction and is used for connecting the plurality of main cooling flow channels (31).

4. The battery pack according to claim 3, characterized in that: The connecting flow channel (32) is located in an area outside the area where the flow channel plate (1) is opposite to the module (2).

5. The battery pack according to claim 2, characterized in that: The battery pack (100) further comprises: An expansion beam (4), wherein the battery core (21) is provided on at least one side of the expansion beam (4) along the first direction, and the expansion beam (4) extends along the second direction and is connected to the flow channel plate (1).

6. The battery pack according to claim 1, characterized in that: The surface of the flow channel plate (1) facing the module (2) has a recessed portion (11) that is recessed away from the module (2), and at least a portion of the inner wall of the recessed portion (11) and the surface of the module (2) facing the flow channel plate (1) together define at least a portion of the cooling flow channel (3).

7. The battery pack according to claim 6, characterized in that: Part of the recessed portion (11) is located in an area outside an area where the flow channel plate (1) and the module (2) are opposite to each other, and the battery pack (100) further comprises: A cover plate (5), the cover plate (5) being located on one side of the module (2) and connected to the flow channel plate (1), the cooling flow channel (3) being defined between the cover plate (5) and the inner wall of the recessed portion (11) and between the module (2) and the inner wall of the recessed portion (11).

8. The battery pack according to claim 1, characterized in that: The module (2) is connected to the flow channel plate (1) by welding or by gluing with structural adhesive.

9. The battery pack according to claim 1, characterized in that: The module (2) and the flow channel plate (1) are connected via fasteners, and a sealing ring is provided between the flow channel plate (1) and the module (2).

10. A vehicle, characterized in that: Comprising a battery pack (100) according to any one of claims 1 to 9.

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