Thermal management assembly for battery cell group and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a thermal management assembly for a battery cell group and a battery pack, the battery cell group comprises a plurality of rows of battery cells, the thermal management assembly comprises a body and a heat dissipation plate, the body is arranged between two rows of battery cells, a flow channel is arranged in the body, and cooling liquid flows through the flow channel; the heat dissipation plate comprises a first face and a second face, the first face faces the electric connecting piece, and the second face faces the body. Therefore, the heat dissipation problem of the electric connecting piece of the battery cell group can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly provides a thermal management component for a battery cell group and a battery pack. Background Art

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

[0003] To achieve thermal management of the battery pack, thermal management components such as a main water pipe and a cooling plate are usually arranged in the battery pack for thermal management. Electrical connectors are arranged in the battery cell group to achieve electrical connection between the battery cells. When current flows through the electrical connectors, the electrical connectors will generate heat. Especially during high-power charging and discharging, the current is large and the generated heat is also high. How to effectively dissipate the heat of the electrical connectors has become an urgent problem to be solved. Summary of the Utility Model

[0004] The utility model aims to solve the problem of heat dissipation of the electrical connectors of the battery cell group.

[0005] In a first aspect, the utility model provides a thermal management component for a battery cell group. The battery cell group includes multiple rows of battery cells. The thermal management component includes a body and a heat dissipation plate: wherein, the body is arranged between two rows of the battery cells, a flow channel is arranged in the body, and the flow channel is for the coolant to flow through; the heat dissipation plate includes a first surface and a second surface, the first surface faces the electrical connector, and the second surface faces the body.

[0006] Optionally, a heat transfer member is arranged between the first surface and the electrical connector.

[0007] Optionally, the second surface is connected to the body.

[0008] Optionally, the heat dissipation plate is arranged at the end of the body.

[0009] Optionally, an end plate is arranged at the end of the battery cell group, and the second surface faces the end plate.

[0010] Optionally, the end plate includes a bearing surface, the second surface is parallel to the bearing surface, and the second surface faces the bearing surface.

[0011] Optionally, the thermal management component further includes a heat conducting plate. The heat dissipation plate is connected to the body through the heat conducting plate, and the heat conducting plate is attached to the side surface of the body.

[0012] Optionally, an end plate is provided at the end of the battery cell group. The heat conduction plate includes a first side surface and a second side surface. The first side surface is connected to the main body, and the second side surface is connected to the end plate.

[0013] Optionally, the battery cell is a cylindrical battery cell, and the shape of the main body matches the side surface of the cylindrical battery cell.

[0014] In a second aspect, the present utility model further provides a battery pack, which includes a box body, a battery cell group, and the heat management component described in any one of the above items. The battery cell group and the heat management component are arranged in the box body.

[0015] Compared with the prior art, the present utility model has obvious advantages and beneficial effects. By means of the above technical solutions, the heat management component and the battery pack of the battery cell group of the present utility model can achieve quite remarkable technical progressiveness and practicality, and have wide utilization value in the industry. It has at least the following advantages:

[0016] In the case of adopting the above technical solutions, the heat management component provided by the present utility model includes a main body for heat management of the battery cell and a heat dissipation plate for dissipating heat of the electrical connection member. While cooling the battery cell, it can also effectively dissipate heat of the electrical connection member. Especially for the scenario of high-power charging and discharging, the heat dissipation effect is particularly obvious.

[0017] Furthermore, the bottom of the heat dissipation plate is connected to the top of the main body. Such a heat management component has a simple structure and is convenient for installation.

[0018] Furthermore, the heat dissipation plate is connected to the side surface of the main body through a heat conduction plate, which can effectively increase the contact area with the main body, and has higher heat dissipation efficiency and better effect. Description of the Drawings

[0019] The following describes the preferred embodiments of the present utility model with reference to the drawings. In the drawings:

[0020] Figure 1 is a schematic structural diagram of the first heat management component provided by the present utility model;

[0021] Figure 2 is a front view of the internal structure of the first battery pack provided by the present utility model;

[0022] Figure 3 is a top view of the internal structure of the first battery pack provided by the present utility model;

[0023] Figure 4 is an exploded view of the internal structure of the first battery pack provided by the present utility model;

[0024] Figure 5Partial structural schematic diagram of the second thermal management component provided by the present utility model;

[0025] Figure 6 Top view of the internal part of the second battery pack provided by the present utility model;

[0026] Figure 7 is Figure 6 Enlarged view of area A in

[0027] Figure 8 Exploded view of the internal part of the second battery pack provided by the present utility model.

[0028] List of reference numerals:

[0029] 10. Thermal management component; 101. Body; 1011. End of the body; 102. Heat dissipation plate; 1021. First surface of the heat dissipation plate; 1022. Second surface of the heat dissipation plate; 103. Heat transfer member; 104. Heat conducting plate; 1041. First side surface of the heat conducting plate; 1042. Second side surface of the heat conducting plate; 105. Connection surface; 20. Electric core; 30. Electrical connection member; 40. End plate; 401. Bearing surface of the end plate; 50. Glue filling and sealing body. Detailed implementation manners

[0030] The preferred implementation manners of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0031] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "inside", "outside", "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "arrange", "connect", "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 utility model can be understood according to specific situations.

[0033] Please refer to Figures 1 to 8 , Figure 1Schematic diagram of the first thermal management component 10 provided by the present utility model; placing the first thermal management component 10 into the battery pack to obtain the structure of the first battery pack provided by the present utility model, Figures 2 to 4 The front view, top view and exploded view of the internal structure of the first battery pack are respectively provided. Figure 5 Schematic diagram of the second thermal management component 10 provided by the present utility model; placing the second thermal management component 10 into the battery pack to obtain the structure of the second battery pack provided by the present utility model, Figure 6 and Figure 8 The top view and exploded view of the internal structure of the second battery pack are respectively provided.

[0034] In the first aspect, please refer to Figure 1 , the present utility model provides a thermal management component 10 for a battery cell group, and the battery cell group includes multiple rows of battery cells 20.

[0035] This thermal management component 10 can be referred to as a cooling plate, cold plate, heat plate, liquid cooling plate, liquid cooling pipe, etc. The thermal management component 10 includes a body 101 and a heat dissipation plate 102: wherein, the body 101 is arranged between two rows of battery cells 20, and a flow channel is arranged in the body 10, and the flow channel is for the coolant to flow through. By heating or cooling the coolant, heating or cooling of the battery cells 20 can be realized. The coolant can be a liquid such as ethylene glycol or water.

[0036] Optionally, the heat dissipation plate 102 is connected to the body 101 through a connection surface 105. Further, the heat dissipation plate 102 can be integrally formed with the body 101, or the heat dissipation plate 102 can be connected to the body 101 through an adhesive such as glue.

[0037] In one embodiment, the battery cells mentioned in this application may include at least one of prismatic battery cells, cylindrical battery cells or soft-pack battery cells. In this application, cylindrical battery cells are taken as an example for illustration. When the battery cells 20 are cylindrical battery cells, the side shape of the body 101 matches that of the cylindrical battery cells 20. Further, the side surface of the body 101 is attached to the arc-shaped side surface of the cylindrical battery cells 10.

[0038] Optionally, a body 101 can be arranged between every two rows of cylindrical battery cells 20. Or, a body 101 can also be arranged every multiple rows (such as two rows) of cylindrical battery cells 10.

[0039] In the second aspect, the present utility model further provides a battery pack, which includes a box body (not shown in the figure), a battery cell group and a thermal management component 10, and the battery cell group and the thermal management component 10 are arranged in the box body.

[0040] Optionally, the box body includes a box cover, a lower box body, and a bottom plate. The lower box body includes a plurality of side walls connected end to end. The box cover and the bottom plate are respectively disposed on two sides of the lower box body, and thus a sealed cavity is formed inside the box body. The above-mentioned thermal management component 10 and the battery cell 20 are disposed in the cavity.

[0041] In one embodiment, the top of the battery cell 20 faces the upper box cover, the bottom of the battery cell 20 faces the bottom plate, and the height direction H of the battery cell 20 is also the height direction of the battery pack.

[0042] Optionally, the top of the battery cell 20 is bonded to the upper box cover, and the bottom of the battery cell 20 is bonded to the bottom plate. The body 101 and the battery cell 20 are connected by glue (such as thermal conductive glue, double-sided tape, etc.), which can improve the heat transfer efficiency. Using glue bonding as a connection method can minimize the application of connecting components to further improve the space utilization rate inside the battery pack.

[0043] Wherein, the heat dissipation plate 102 includes a first surface 1021 and a second surface 1022. The first surface 1021 faces the electrical connector 30, and the second surface 1022 faces the body 101. As Figure 1 shown, the heat dissipation plate 102 is a flat plate, the upper surface thereof is the first surface 1021, and the lower surface is the second surface 1022.

[0044] Through the thermal management component 10 provided by this embodiment, which includes a body 101 for thermal management of the battery cell 20 and a heat dissipation plate 102 for dissipating heat from the electrical connector 30, it can effectively dissipate heat from the electrical connector 30 while cooling the battery cell 20. Especially for the scenario of high-power charging and discharging, the heat dissipation effect is particularly obvious.

[0045] In a specific embodiment, as Figure 1 shown, the large surface of the heat dissipation plate 102 is perpendicular to the height direction of the body 101, and the large surface of the heat dissipation plate 102 is parallel to the flow channel direction inside the body 101.

[0046] In one embodiment, the second surface 1022 of the heat dissipation plate 102 is connected to the body 101. Further, the second surface 1022 (i.e., the lower surface) of the heat dissipation plate 102 is connected to the top of the body 101. Such a thermal management component has a simple structure and is convenient for installation.

[0047] In a specific embodiment for the electrical connector 30 (not shown in the figure of this embodiment), the electrical connector 30 can be a busbar (also known as a bus bar, bar sheet) (not shown in the figure). The electrical connector is disposed above the cylindrical battery cell. The first surface 1021 of the heat dissipation plate 102 is in contact with the busbar, so that the heat of the busbar can be transferred to the heat dissipation plate 102 and then transferred to the body 101 through the heat dissipation plate to achieve cooling of the busbar.

[0048] In this embodiment, each thermal management component 10 may include one or more heat dissipation plates 102. When multiple heat dissipation plates 102 are included, these heat dissipation plates 102 may be dispersedly arranged at the upper end of the body 101 to achieve heat dissipation of the busbar.

[0049] In another specific embodiment of the electrical connector 30 (such as Figures 2 to 4 and Figures 6 to 8 ), the electrical connector 30 may be the output pole 30 of the battery cell group, and the output pole 30 is used to export the electrical energy of the battery cell group 20, and it is generally arranged at the edge of the battery cell group. At this time, the heat dissipation plate 102 may be arranged at the end 1011 of the body 101, so that the positions of the heat dissipation plate 102 and the output pole 30 correspond to achieve heat dissipation of the output pole 30.

[0050] In this embodiment, a single thermal management component 10 only arranges the heat dissipation plate 102 at the end 1011 of the body 101 (which may be one end or both ends of the thermal management component 10) to achieve heat dissipation of the output pole 30. Specifically, which thermal management components 10 need to be provided with the heat dissipation plate 102, as well as the shape and size of the heat dissipation plate 102, are determined according to the heat dissipation requirements of the output pole 30.

[0051] Figure 1 Shows the position of the output pole 30 described in this patent. When the battery pack is charged and discharged, especially during high-power charging and discharging, the output pole 30 is the area where high temperature exists in the battery pack. The battery cells facing the output pole end (such as 8 in the figure) are easily affected by high temperature. This causes the temperature field distribution of the entire pack of battery cells to be uneven. Effectively dissipating heat from the output pole 30 can also effectively even out the temperature inside the battery pack and maintain the consistency of the battery cells inside the battery pack.

[0052] In one embodiment, a heat transfer member 103 is provided between the first surface 1021 of the heat dissipation plate 102 and the electrical connector 30. Specifically, the heat transfer member 103 may be any component or material for achieving heat conduction. For example, the heat transfer member 103 may be thermal conductive adhesive, thermal conductive silica gel pad, etc.

[0053] It should be noted that the electrical connector 30 is made of conductive materials such as copper or aluminum. When dissipating heat from the electrical connector 20 through the heat dissipation member 102, good insulation between the electrical connector 20 and the heat dissipation member 102 needs to be ensured. Therefore, the heat transfer member 103 may be a material with good insulation performance and good heat conduction performance. Or, the heat dissipation member 102 may be made of a material with good insulation performance and good heat conduction performance.

[0054] In a specific embodiment, please refer to Figure 3, a heat dissipation plate 102 is disposed at the end 1011 of the body 101, and the gap between the heat dissipation plate 102 and the bottom of the output electrode 30 will be filled with a heat transfer member 103. A heat transfer path of the output electrode 30 - heat transfer member 103 - heat dissipation plate 102 - body 101 is formed.

[0055] In one embodiment, an end plate 40 is provided at the end of the battery cell group. The end plate 40 is disposed between the battery cell group and the box body, and the second surface 1022 of the heat dissipation plate 102 faces the end plate 40.

[0056] Optionally, the end plate 40 includes a bearing surface 401. The second surface 1022 of the heat dissipation plate 102 is parallel to the bearing surface 401 of the end plate 40, and the second surface 1022 of the heat dissipation plate 102 faces the bearing surface 401 of the end plate 40.

[0057] Wherein, the bearing surface 401 of the end plate 40 can be a flat surface, or as shown, a plurality of through holes are provided on the bearing surface 401. Generally speaking, in order to reduce the weight of the end plate 40, the end plate 40 is set as a hollow structure, so the bearing surface 401 can include a plurality of through holes.

[0058] Furthermore, the second surface 1022 of the heat dissipation plate 102 can be in contact with the upper surface (i.e., the bearing surface 401) of the end plate 40, and the first surface 1021 of the heat dissipation plate 102 is in contact with the electrical connector 30. Thus, the electrical connector 30 can be attached to the upper surface (i.e., the bearing surface 401) of the end plate 40 through the heat dissipation plate 102, improving the stability of the arrangement of the electrical connector 30.

[0059] In one embodiment, please refer to Figures 5 to 8 , for the second type of the heat management component 10, it includes a body 101, a heat dissipation plate 102 and a heat conduction plate 104. The heat dissipation plate 102 is connected to the body 101 through the heat conduction plate 104. The features of the heat conduction plate 104 are introduced below.

[0060] The heat conduction plate 103 is attached to the side surface of the body 101. Compared with the first type of heat management component, in this solution, the contact area between the heat conduction plate 103 and the body 101 is larger, and the heat dissipation effect is better.

[0061] In another specific embodiment, the heat conduction plate 104 includes a first side surface 1041 and a second side surface 1042. The first side surface 1041 is connected to the side surface of the body 101, and the second side surface 1042 is connected to the end plate 40.

[0062] Optionally, the plane where the heat conducting plate 104 is located (this plane can be the first side 1041 or the second side 1042) is perpendicular to the plane where the heat dissipation plate 102 is located (this plane can be the first surface 1021 or the second surface 1022). Thus, the heat conducting plate 104 and the heat dissipation plate 102 form an "L"-shaped structural member.

[0063] Optionally, there is a gap between the end plate 40 and the body 101. The heat conducting plate 104 is inserted into this gap, and glue is poured into this gap to form a glue-filled seal 50. The glue-filled seal 50 is a heat conducting material. Thus, the end plate 40, the heat conducting plate 104, and the body 101 form an integral structure. On the one hand, the heat conducting plate 104 and the body 101 are connected through the glue-filled seal 50, enabling heat to flow from the heat conducting plate 104 to the body 101 for heat dissipation. On the other hand, the integral structure can improve the mechanical properties of the structure inside the battery pack.

[0064] In a specific embodiment, after the end plate 40, the body 101, the battery cell 20, and the output pole 30 are assembled, the "L"-shaped structural member in the end plate 40 connects the output pole 30 and the body 101 through the glue-filled seal 50 to form a heat dissipation path. The bottom of the "L"-shaped structural member transfers heat to the side surface of the body 101 through the glue-filled seal 50, and the first surface 1021 of the heat dissipation plate 102 in the "L"-shaped structural member contacts the bottom surface of the output pole 30 through the heat transfer member 103 for heat transfer. The assembled heat transfer path is output pole 30 - heat transfer member 103 - "L"-shaped structural member - potting colloid 50 - body 101.

[0065] Figure 6 and Figure 8 shows the assembled top view and the exploded view, Figure 7 is Figure 6 the enlarged view of area A in

[0066] It should be noted that the position of the heat conducting plate 104 corresponds to the heat dissipation plate 102. Only when the heat dissipation plate 102 is arranged at the end 1011 of the body 101, the heat conducting plate 104 needs to be connected to the end plate 40. If the heat dissipation plate 102 is arranged at a non-end position of the body 101, the heat conducting plate 104 can be just attached to the side surface of the body 101.

[0067] For the second type of thermal management component and other structures and descriptions, reference can be made to the relevant descriptions of the first type of thermal management component, which will not be elaborated here.

[0068] Thirdly, the present invention also provides a vehicle. The vehicle of the present invention includes any one of the battery packs introduced above.

[0069] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0070] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, 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 present invention.

Claims

1. A thermal management component for a battery pack, characterized in that: The battery cell group includes multiple rows of battery cells, and the thermal management component includes a body and a heat sink: Wherein, the body is arranged between two rows of the battery cells, and a flow channel is arranged in the body, and the flow channel is used for the circulation of cooling liquid; The heat dissipation plate includes a first surface and a second surface, wherein the first surface faces the electrical connection component, and the second surface faces the body.

2. The thermal management assembly according to claim 1, characterized in that A heat transfer element is provided between the first surface and the electrical connection element.

3. The thermal management assembly according to claim 1, characterized in that The second surface is connected to the body.

4. The thermal management assembly according to any one of claims 1 to 3, characterized in that: The heat dissipation plate is arranged at the end of the body.

5. The thermal management assembly according to claim 4, characterized in that An end plate is provided at the end of the battery cell group, and the second surface faces the end plate.

6. The thermal management assembly according to claim 5, characterized in that The end plate includes a bearing surface, the second surface is parallel to the bearing surface, and the second surface faces the bearing surface.

7. The thermal management assembly according to any one of claims 1 to 3, characterized in that: The thermal management component further includes a heat conducting plate, the heat dissipation plate is connected to the body via the heat conducting plate, and the heat conducting plate is attached to a side surface of the body.

8. The thermal management assembly according to claim 7, characterized in that An end plate is provided at the end of the battery cell group, and the heat conducting plate includes a first side surface and a second side surface, wherein the first side surface is connected to the body, and the second side surface is connected to the end plate.

9. The thermal management assembly according to any one of claims 1 to 3, characterized in that: The battery cell is a cylindrical battery cell, and the body matches the side shape of the cylindrical battery cell.

10. A battery pack, characterized in that: The battery pack comprises a housing, a battery cell group and a thermal management component according to any one of claims 1 to 9, wherein the battery cell group and the thermal management component are disposed in the housing.

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