Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a shell; the cooling plate is arranged in the shell; the first battery module and the second battery module are both arranged in the shell and are respectively arranged on two sides of the cooling plate in the thickness direction, and the first battery module and the second battery module are both connected with the cooling plate; the heating film assembly is arranged in the shell, and the heating film assembly is arranged on one side, in the thickness direction, of the cooling plate and connected with the cooling plate. According to the battery pack disclosed by the utility model, the layer number of the heating film assemblies in the thickness direction of the cooling plate can be reduced while the heating efficiency of the first battery module and the second battery module is ensured, and the occupied space in the battery pack in the thickness direction of the cooling plate is reduced. And meanwhile, the service life of the battery pack is prolonged along with the reduction of the layer number of the heating film assembly in the thickness direction of the cooling plate.

Description

Technical Field

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

[0002] Currently, in the technology of heating battery modules stacked in the Z-direction space in a battery pack, it is necessary to bond multiple layers of heating films to different layers of battery modules in an adhesive form for heating, which increases the number of layers of the heating films and occupies more Z-direction space in the battery pack. At the same time, due to the influence of vibration and shear force between the heating film and the battery cell during operation, the strength of the heating film itself will rapidly decay with aging. Therefore, the setting of multiple layers of heating films will also reduce the service life of the battery pack. However, reducing the number of layers of the heating films will cause some battery modules to not be directly heated by the heating films, resulting in poor heating effect for some battery modules. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery pack, which can reduce the number of layers of the heating film assembly in the thickness direction of the cooling plate while ensuring the heating efficiency of the first battery module and the second battery module, reducing the space occupied in the thickness direction of the cooling plate in the battery pack, and also improving the service life of the battery pack.

[0004] The battery pack according to an embodiment of the utility model includes: a housing; a cooling plate disposed in the housing; a first battery module and a second battery module, both the first battery module and the second battery module are disposed in the housing and are respectively disposed on both sides of the cooling plate in the thickness direction, the first battery module and the second battery module are both connected to the cooling plate; a heating film assembly disposed in the housing, the heating film assembly is disposed on one side of the cooling plate in the thickness direction and is connected to the cooling plate.

[0005] For the battery pack according to an embodiment of the utility model, the first battery module and the second battery module are respectively disposed on both sides of the cooling plate in the thickness direction and are both connected to the cooling plate, and the heating film assembly is disposed on one side of the cooling plate in the thickness direction and is connected to the cooling plate, so that the heat generated by the heating film assembly can be well transferred to the first battery module and the second battery module through the cooling plate. While ensuring the heating efficiency of the first battery module and the second battery module, the number of layers of the heating film assembly in the thickness direction of the cooling plate can be reduced, and the space occupied in the thickness direction of the cooling plate in the battery pack is reduced. At the same time, with the reduction of the number of layers of the heating film assembly in the thickness direction of the cooling plate, the service life of the battery pack is also improved.

[0006] In some embodiments of the present utility model, the cooling plate includes: a substrate and a flow channel plate. The flow channel plate is disposed on one side of the substrate facing the heating film assembly. The flow channel plate includes a plate body and flow channel protrusions. The flow channel protrusions are disposed on one side of the plate body facing the heating film assembly. The flow channel protrusions include main path flow channel protrusions and branch path flow channel protrusions. The main path flow channel protrusions extend along the length direction of the plate body. The heating film assembly and the branch path flow channel protrusions are both disposed on both sides of the main path flow channel protrusions along the width direction of the plate body. The branch path flow channel protrusions and the heating film assembly extend along the width direction of the plate body. The heating film assembly is disposed on at least one side of the branch path flow channel protrusions along the length direction of the plate body.

[0007] In some embodiments of the present utility model, the branch path flow channel protrusions are multiple and spaced apart along the length direction of the plate body. The heating film assembly is disposed between every two adjacent branch path flow channel protrusions.

[0008] In some embodiments of the present utility model, the heating film assembly includes: a heating film body; and an outgoing wire package. The outgoing wire package is disposed at one end of the heating film body facing away from the main path flow channel protrusions and is connected to the heating film body.

[0009] In some embodiments of the present utility model, the battery pack further includes: a wire harness plug-in. The wire harness plug-in is disposed in the housing and on one side of the plate body facing the heating film assembly, and on the side of the branch path flow channel protrusions facing away from the main path flow channel protrusions. Along the length direction of the plate body, the wire harness plug-in is disposed between two adjacent heating film assemblies and is connected to the outgoing wire packages of the two adjacent heating film assemblies.

[0010] In some embodiments of the present utility model, the width of the wire harness plug-in along the width direction of the plate body is 10 - 15 mm.

[0011] In some embodiments of the present utility model, the length of the main path flow channel protrusions along the length direction of the plate body is greater than or equal to the lengths of the first battery module and the second battery module along the length direction of the plate body; and / or, the sum of the lengths of the two branch path flow channel protrusions along the width direction of the plate body is greater than or equal to the length of the first battery module along the width direction of the plate body and greater than or equal to the length of the second battery module along the width direction of the plate body.

[0012] In some embodiments of the present utility model, the minimum distance between the edge of the flow channel protrusions and the edge of the plate body is greater than or equal to 15 mm.

[0013] In some embodiments of the present utility model, the first battery module includes a plurality of first sub-modules arranged along the length direction of the cooling plate, and the second battery module includes a plurality of second sub-modules arranged along the length direction of the cooling plate.

[0014] In some embodiments of the present utility model, the cooling plate and the first battery module are connected by thermal conductive adhesive; and / or, the cooling plate and the second battery module are connected by thermal conductive adhesive; and / or, the cooling plate and the heating film assembly are adhesively connected.

[0015] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 an enlarged view of part A in

[0019] Figure 3 is a top view of a battery pack according to an embodiment of the present utility model;

[0020] Figure 4 is a top view of a cooling plate according to an embodiment of the present utility model;

[0021] Figure 5 is Figure 4 an enlarged view of part B in

[0022] REFERENCE SIGNS:

[0023] 10, battery pack;

[0024] 1, cooling plate; 11, flow channel plate; 12, plate body; 13, flow channel protrusion; 131, main channel flow channel protrusion; 132, branch channel flow channel protrusion;

[0025] 2, heating film assembly; 21, heating film body; 22, wire outlet package;

[0026] 3, first battery module; 31, first sub-module; 311, first battery cell; 312, first end plate;

[0027] 4, second battery module; 41, second sub-module; 411, second battery cell; 412, second end plate;

[0028] 5. Wiring harness plug-in;

[0029] 6. Housing;

[0030] 7. Thermal insulation component. Detailed implementation manners

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship 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 therefore should not be construed as a limitation to the present utility model. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "plurality" is two or more.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should 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 situations.

[0034] Next, refer to Figures 1 - 5 to describe the battery pack 10 according to the embodiment of the present utility model.

[0035] As Figures 1 - 5 shown, the battery pack 10 according to the embodiment of the present utility model includes: a housing 6, a cooling plate 1, a heating film assembly 2, a first battery module 3, and a second battery module 4.

[0036] Specifically, refer to Figures 1 - 5, the cooling plate 1 is arranged inside the housing 6; the first battery module 3 and the second battery module 4 are both arranged inside the housing 6 and are respectively arranged on both sides of the cooling plate 1 in the thickness direction, and the first battery module 3 and the second battery module 4 are both connected to the cooling plate 1; the heating film assembly 2 is arranged inside the housing 6, and the heating film assembly 2 is arranged on one side of the cooling plate 1 in the thickness direction and is connected to the cooling plate 1. Among them, in the present invention, the heating film assembly 2 is arranged on the side of the cooling plate 1 facing the first battery module 3, but the present invention is not limited to this, and the heating film assembly 2 can also be arranged on the side of the cooling plate 1 facing the second battery module 4.

[0037] It can be understood that the heating film assembly 2 can heat the cooling plate 1. Since the first battery module 3 and the second battery module 4 are respectively arranged on both sides of the cooling plate 1 in the thickness direction, the cooling plate 1 can heat the first battery module 3 and the second battery module 4 simultaneously. Thus, the first battery module 3 and the second battery module 4 can be heated simultaneously through one layer of the heating film assembly 2, thereby reducing the number of layers of the heating film assembly 2 arranged in the thickness direction of the cooling plate 1 and reducing the space occupied in the thickness direction of the cooling plate 1 in the battery pack 10. At the same time, as the number of layers of the heating film assembly 2 in the thickness direction of the cooling plate 1 decreases, the service life of the battery pack 10 is also improved.

[0038] In addition, since the cooling plate 1 is formed of a metal with good thermal conductivity and the cooling plate 1 is connected to both the first battery module 3 and the second battery module 4, the cooling plate 1 can directly transfer heat to both the first battery module 3 and the second battery module 4. Thus, the heat generated by the heating film assembly 2 can be well transferred to the first battery module 3 and the second battery module 4 through the cooling plate 1, thereby ensuring the heating efficiency of the first battery module 3 and the second battery module 4.

[0039] According to the battery pack 10 of the embodiment of the present invention, by arranging the first battery module 3 and the second battery module 4 at intervals relative to each other in the thickness direction of the cooling plate 1 and both being connected to the cooling plate 1, and arranging the heating film assembly 2 on one side of the cooling plate 1 in the thickness direction and connecting it to the cooling plate 1, the heat generated by the heating film assembly 2 can be well transferred to the first battery module 3 and the second battery module 4 through the cooling plate 1. While ensuring the heating efficiency of the first battery module 3 and the second battery module 4, the number of layers of the heating film assembly 2 arranged in the thickness direction of the cooling plate 1 can be reduced, and the space occupied in the thickness direction of the cooling plate 1 in the battery pack 10 can be reduced. At the same time, as the number of layers of the heating film assembly 2 in the thickness direction of the cooling plate 1 decreases, the service life of the battery pack 10 is also improved.

[0040] In some embodiments of the present invention, such as Figures 1 - 5As shown in the figure, the cooling plate 1 includes: a substrate and a flow channel plate 11. The flow channel plate 11 is disposed on one side of the substrate facing the heating film assembly 2. The flow channel plate 11 includes a plate body 12 and flow channel protrusions 13. The flow channel protrusions 13 are disposed on one side of the plate body 12 facing the heating film assembly 2. The flow channel protrusions 13 include a main channel flow channel protrusion 131 and branch channel flow channel protrusions 132. The main channel flow channel protrusion 131 extends along the length direction of the plate body 12. The heating film assembly 2 and the branch channel flow channel protrusions 132 are disposed on both sides of the main channel flow channel protrusion 131 along the width direction of the plate body 12. The branch channel flow channel protrusions 132 and the heating film assembly 2 extend along the width direction of the plate body 12. The heating film assembly 2 is disposed on at least one side of the branch channel flow channel protrusion 132 along the length direction of the plate body 12.

[0041] Among them, it should be noted that the flow channel protrusions 13 can be formed by stamping on the plate body 12. A main channel is formed between the main channel flow channel protrusion 131 and the substrate, and a branch channel is formed between the branch channel flow channel protrusion 132 and the substrate. The branch channel and the main channel are interconnected, and the coolant flows in the branch channel and the main channel, so as to realize the heat exchange between the cooling plate 1 and the first battery module 3, the second battery module 4 and the heating film assembly 2.

[0042] It can be understood that the branch channel flow channel protrusions 132 are disposed on both sides of the main channel flow channel protrusion 131 along the width direction of the plate body 12, thereby increasing the flow path of the coolant, further improving the heat exchange efficiency, and further improving the heating efficiency of the first battery module 3 and the second battery module 4. The heating film assembly 2 is disposed on both sides of the main channel flow channel protrusion 131 along the width direction of the plate body 12, thereby further improving the heating efficiency of the first battery module 3 and the second battery module 4.

[0043] Furthermore, as Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, the heating film assembly 2 is disposed on at least one side of the branch channel flow channel protrusion 132 along the length direction of the plate body 12. For example, the heating film assembly 2 can be disposed on one side of the branch channel flow channel protrusion 132 along the length direction of the plate body 12, or the heating film assembly 2 can also be disposed on both sides of the branch channel flow channel protrusion 132 along the length direction of the plate body 12.

[0044] Since the heating film assembly 2 is disposed on at least one side of the branch channel flow channel protrusion 132 along the length direction of the plate body 12, the heating film assembly 2 can share part of the space with the branch channel flow channel protrusion 132 in the thickness direction of the cooling plate 1. Thus, further reducing the space occupied in the thickness direction of the cooling plate 1 in the battery pack 10 is beneficial to optimizing the volume of the battery pack 10.

[0045] In some embodiments of the present invention, as Figure 1 、Figure 2 , Figure 4 and Figure 5 As shown in ,

[0046] , there are multiple branch channel protrusions 132 spaced apart along the length direction of the plate body 12, and a heating film assembly 2 is provided between every two adjacent branch channel protrusions 132.

[0046] It can be understood that there are multiple branch channel protrusions 132 spaced apart along the length direction of the plate body 12, thereby further increasing the flow path of the coolant, further improving the heat exchange efficiency, and further improving the heating efficiency of the first battery module 3 and the second battery module 4.

[0047] The heating film assembly 2 is provided between two adjacent branch channel protrusions 132. On the one hand, it increases the heating efficiency. On the other hand, it enables multiple heating film assemblies 2 to share part of the space with the branch channel protrusions 132 in the thickness direction of the cooling plate 1. Thus, further reducing the space occupied in the thickness direction of the cooling plate 1 in the battery pack 10 is beneficial to optimizing the volume of the battery pack 10.

[0048] In some embodiments of the present invention, as shown in Figure 1 , Figure 2 , Figure 4 , the heating film assembly 2 includes: a heating film body 21 and an outgoing wire package 22. The outgoing wire package 22 is provided at one end of the heating film body 21 facing away from the main channel protrusion 131 and is connected to the heating film body 21. Thus, it is convenient to lead out the wires of the outgoing wire package 22 to supply power to the heating film assembly 2. Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown in ,

[0049] , the battery pack 10 further includes: a wire harness plug-in 5. The wire harness plug-in 5 is provided in the housing 6 and on the side of the plate body 12 facing the heating film assembly 2, and on the side of the branch channel protrusion 132 facing away from the main channel protrusion 131. Along the length direction of the plate body 12, the wire harness plug-in 5 is provided between two adjacent heating film assemblies 2 and is connected to the outgoing wire packages 22 of the two adjacent heating film assemblies 2.

[0049] In some embodiments of the present invention, as shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 , the battery pack 10 further includes: a wire harness plug-in 5. The wire harness plug-in 5 is provided in the housing 6 and on the side of the plate body 12 facing the heating film assembly 2, and on the side of the branch channel protrusion 132 facing away from the main channel protrusion 131. Along the length direction of the plate body 12, the wire harness plug-in 5 is provided between two adjacent heating film assemblies 2 and is connected to the outgoing wire packages 22 of the two adjacent heating film assemblies 2. Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown in ,

[0050] , the battery pack 10 further includes: a wire harness plug-in 5. The wire harness plug-in 5 is provided in the housing 6 and on the side of the plate body 12 facing the heating film assembly 2, and on the side of the branch channel protrusion 132 facing away from the main channel protrusion 131. Along the length direction of the plate body 12, the wire harness plug-in 5 is provided between two adjacent heating film assemblies 2 and is connected to the outgoing wire packages 22 of the two adjacent heating film assemblies 2.

[0050] It can be understood that multiple heating film assemblies 2 can be electrically connected through the wire harness plug-in 5, so as to realize the simultaneous heating of multiple heating film assemblies 2. Among them, the wire harness plug-in 5 is provided on the side of the branch channel protrusion 132 facing away from the main channel protrusion 131. On the one hand, it is convenient to connect with the outgoing wire package 22. On the other hand, the wire harness plug-in 5 can share part of the space with the branch channel protrusion 132 in the thickness direction of the cooling plate 1. Thus, further reducing the space occupied in the thickness direction of the cooling plate 1 in the battery pack 10 is beneficial to optimizing the volume of the battery pack 10.

[0051] In some embodiments of the present utility model, the width of the wire harness plug 5 in the width direction of the plate body 12 is 10 - 15 mm. For example, 10 mm, 11 mm, 12 mm or 15 mm, etc. Thus, the wire harness plug 5 has an appropriate width, avoiding the wire harness plug 5 being too wide and thus being exposed outside the plate body 12, thereby avoiding the wire harness plug 5 being suspended, making the installation stable and reducing damage to the wire harness plug 5.

[0052] In some embodiments of the present utility model, the length of the main channel protrusion 131 in the length direction of the plate body 12 is greater than or equal to the lengths of the first battery module 3 and the second battery module 4 in the length direction of the plate body 12. Thus, the main channel protrusion 131 can cover the first battery module 3 and the second battery module 4 in the length direction of the plate body 12, thereby improving the heating efficiency.

[0053] In some embodiments of the present utility model, the sum of the lengths of the two branch channel protrusions 132 in the width direction of the plate body 12 is greater than or equal to the length of the first battery module 3 in the width direction of the plate body 12 and greater than or equal to the length of the second battery module 4 in the width direction of the plate body 12. Thus, the branch channel protrusions 132 can cover the first battery module 3 and the second battery module 4 in the width direction of the plate body 12, thereby further improving the heating efficiency.

[0054] In some embodiments of the present utility model, the minimum distance between the edge of the channel protrusion 13 and the edge of the plate body 12 is greater than or equal to 15 mm, such as 15 mm, 16 mm, 17 mm or 18 mm, etc. Among them, the projection of the channel protrusion 13 on the substrate completely falls within the projection of the plate body 12 on the substrate, and the minimum distance between the edge of the channel protrusion 13 and the edge of the plate body 12 refers to the minimum distance between the outer contour of the projection of the channel protrusion 13 on the substrate and the outer contour of the projection of the plate body 12 on the substrate.

[0055] For example, in Figure 1 , Figure 2 , Figure 4 and Figure 5 In the examples shown, the minimum distance between the edge of the channel protrusion 13 and the edge of the plate body 12 is the distance between the edge on the side of the branch channel protrusion 132 facing away from the main channel protrusion 131 and the edge of the same side plate body 12.

[0056] It can be understood that the minimum distance between the edge of the channel protrusion 13 and the edge of the plate body 12 is greater than or equal to 15 mm, so that there is enough space between the edge of the channel protrusion 13 and the edge of the plate body 12 to install some structures such as the wire harness plug 5, etc.

[0057] In some embodiments of the present utility model, asFigures 1 - 5 As shown, the first battery module 3 includes a plurality of first sub-modules 31 arranged along the length direction of the cooling plate 1, and the second battery module 4 includes a plurality of second sub-modules 41 arranged along the length direction of the cooling plate 1. It can be understood that the plurality of first sub-modules 31 are arranged along the length direction of the cooling plate 1, and the plurality of second sub-modules 41 are arranged along the length direction of the cooling plate 1, so that the cooling plate 1 can better cover the first sub-modules 31 and the second sub-modules 41, thereby further ensuring the heating efficiency.

[0058] For example, in Figures 1 - 5 the example shown, there are two first sub-modules 31 and two second sub-modules 41, but the present invention is not limited thereto. There can be more first sub-modules 31, and there can also be more second sub-modules 41, such as 3, 4, 5, or 6, etc.

[0059] Furthermore, as Figures 1 - 5 shown, the first sub-module 31 includes a plurality of first battery cells 311 and two first end plates 312. The plurality of first battery cells 311 are arranged along the length direction of the cooling plate 1 and are disposed between the two first end plates 312, thereby forming the first sub-module 31 of the present invention. The second sub-module 41 includes a plurality of second battery cells 411 and two second end plates 412. The plurality of second battery cells 411 are arranged along the length direction of the cooling plate 1 and are disposed between the two second end plates 412, thereby forming the second sub-module 41 of the present invention.

[0060] Furthermore, as Figure 1 shown, a heat insulation member 7 is provided between the first end plate 312 and the first battery cell 311, and a heat insulation member 7 is also provided between the second end plate 412 and the second battery cell 411. Thus, the speed of heat loss of the first battery module 3 and the second battery module 4 is reduced, thereby further ensuring the heating efficiency of the first battery module 3 and the second battery module 4.

[0061] In some embodiments of the present invention, the cooling plate 1 and the first battery module 3 are connected by a thermal conductive adhesive; thus, on the one hand, the connection reliability between the cooling plate 1 and the first battery module 3 is improved, and on the other hand, the thermal conductivity between the cooling plate 1 and the first battery module 3 is also improved, thereby further improving the heating efficiency.

[0062] In some embodiments of the present invention, the cooling plate 1 and the second battery module 4 are connected by a thermal conductive adhesive; thus, on the one hand, the connection reliability between the cooling plate 1 and the second battery module 4 is improved, and on the other hand, the thermal conductivity between the cooling plate 1 and the second battery module 4 is also improved, thereby further improving the heating efficiency.

[0063] In some embodiments of the present utility model, the cooling plate 1 and the heating film assembly 2 are adhesively connected. Thereby, the connection reliability between the cooling plate 1 and the heating film assembly 2 is improved.

[0064] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means 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 representation of the above terms does 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.

[0065] 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. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, Comprising: A housing; A cooling plate disposed within the housing; A first battery module and a second battery module, both the first battery module and the second battery module are disposed within the housing, and are respectively disposed on two sides of the cooling plate in the thickness direction, and the first battery module and the second battery module are both connected to the cooling plate; A heating film assembly disposed within the housing, the heating film assembly is disposed on one side of the cooling plate in the thickness direction and is connected to the cooling plate.

2. The battery pack according to claim 1, characterized in that The cooling plate includes: a substrate and a flow channel plate, the flow channel plate is disposed on the side of the substrate facing the heating film assembly, the flow channel plate includes a plate body and a flow channel protrusion, the flow channel protrusion is disposed on the side of the plate body facing the heating film assembly, and the flow channel protrusion includes a main channel flow protrusion and a branch channel flow protrusion. The main channel flow protrusion extends along the length direction of the plate body, and the heating film assembly and the branch channel flow protrusion are both disposed on two sides of the main channel flow protrusion along the width direction of the plate body. The branch channel flow protrusion and the heating film assembly extend along the width direction of the plate body, and the heating film assembly is disposed on at least one side of the branch channel flow protrusion along the length direction of the plate body.

3. The battery pack according to claim 2, wherein, The branch channel flow protrusions are multiple and spaced apart along the length direction of the plate body, and the heating film assembly is disposed between every two adjacent branch channel flow protrusions.

4. The battery pack according to claim 3, characterized in that, The heating film assembly includes: A heating film body; An outgoing wire package disposed at one end of the heating film body facing away from the main channel flow protrusion and connected to the heating film body.

5. The battery pack according to claim 4, characterized in that, Further comprising: A wire harness plug disposed within the housing and on the side of the plate body facing the heating film assembly, and on the side of the branch channel flow protrusion facing away from the main channel flow protrusion. Along the length direction of the plate body, the wire harness plug is disposed between two adjacent heating film assemblies and is connected to the outgoing wire packages of the two adjacent heating film assemblies.

6. The battery pack according to claim 5, wherein, The width of the wire harness plug along the width direction of the plate body is 10 - 15 mm.

7. The battery pack according to claim 2, wherein The length of the main channel flow protrusion along the length direction of the plate body is greater than or equal to the length of the first battery module and the second battery module along the length direction of the plate body; And / or, the sum of the lengths of the two branch channel flow protrusions along the width direction of the plate body is greater than or equal to the length of the first battery module along the width direction of the plate body and greater than or equal to the length of the second battery module along the width direction of the plate body.

8. The battery pack according to claim 2, wherein The minimum distance between the edge of the flow channel protrusion and the edge of the plate body is greater than or equal to 15 mm.

9. The battery pack according to claim 1, wherein The first battery module includes a plurality of first sub-modules arranged along the length direction of the cooling plate, and the second battery module includes a plurality of second sub-modules arranged along the length direction of the cooling plate.

10. The battery pack according to claim 1, wherein, The cooling plate and the first battery module are connected by a thermal conductive adhesive; And / or, the cooling plate and the second battery module are connected by a thermal conductive adhesive; And / or, the cooling plate and the heating film assembly are adhesively connected.

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