Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises a bottom plate, the bottom plate comprises a first plate surface, a concave groove is formed in the first plate surface, and at least partial area, except the groove, of the first plate surface is constructed as a first heat exchange surface for contact heat exchange; the heat conduction layer is in heat conduction connection with at least part of the surface of the groove, and the surface, close to a groove opening of the groove, of the heat conduction layer is constructed to be a second heat exchange face used for contact heat exchange. According to the battery module and the battery pack provided by the invention, the heat conduction layer is in heat conduction connection with at least part of the surface of the groove of the first plate surface, so that the second heat exchange surface is formed in the groove position. When the bottom plate is in heat conduction connection with the heat exchange assembly, the area, without the grooves, in the first plate face can make contact with the heat exchange assembly through the first heat exchange face, the area, with the grooves, in the first plate face can make contact with the heat exchange assembly through the second heat exchange face of the heat conduction layer, and the heat exchange effect between the bottom plate and the heat exchange assembly can be improved; and thus, the temperature of the battery module can be efficiently controlled.

Description

Technical Field

[0001] The present application relates to the field of power battery technology, and in particular to a battery module and a battery pack. Background Art

[0002] For existing battery modules (such as prismatic battery modules or pouch battery modules), they include a cell stack and a base plate located below the cell stack, with the cell stack and the base plate being thermally connected. To control the temperature of the cell stack, the base plate surface can be brought into contact with a heat exchange component for thermal connection.

[0003] However, when an inwardly concave groove appears on the surface of the base plate due to the overall structural design, there is a gap between the groove part and the heat exchange component, and a good thermal conductive connection cannot be formed with the heat exchange component, resulting in poor heat exchange effect between the base plate and the heat exchange component. Utility Model Content

[0004] In view of this, the purpose of the present application is to propose a battery module and a battery pack to at least partially solve the problem of poor heat exchange between the bottom plate and the heat exchange component due to the presence of grooves on the bottom plate.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a battery module, including: a base plate, including a first plate surface, the first plate surface is formed with a concave groove, and at least a portion of the area of ​​the first plate surface other than the groove is constructed as a first heat exchange surface for contact heat exchange; a heat conductive layer, thermally connected to at least a portion of the surface of the groove, and the surface of the heat conductive layer close to the notch of the groove is constructed as a second heat exchange surface for contact heat exchange.

[0006] Optionally, the heat conducting layer is in contact with the groove bottom and / or groove wall of the groove.

[0007] Optionally, the thickness of the heat-conducting layer is not less than the depth of the groove.

[0008] Optionally, the battery module also includes a cell stack located above the base plate, the base plate includes a second plate surface opposite to the first plate surface and close to the cell stack, the second plate surface is formed with a protruding support protrusion, and the support protrusion corresponds to the groove; along the thickness direction of the base plate, the positive projection of the cell stack on the second plate surface covers at least part of the support protrusion; the battery module also includes a thermally conductive adhesive layer arranged between the cell stack and the second plate surface, and the battery module is thermally connected to the second plate surface through the thermally conductive adhesive layer.

[0009] Optionally, at least two supporting protrusions are arranged at intervals, and the thermal conductive adhesive layer is located at least between two adjacent supporting protrusions.

[0010] Optionally, the battery module includes a side plate, which is connected to the circumferential side wall of the battery cell stack, the bottom end of the side plate abuts against the second plate surface of the bottom plate, the battery cell stack is separated from the top of the support protrusion, and the thermal conductive adhesive layer extends between the battery cell stack and the support protrusion.

[0011] Optionally, the supporting protrusion extends to the edge of the second panel surface, the side panel intersects with the supporting protrusion, and the bottom end of the side panel is provided with a positioning groove matching the supporting protrusion.

[0012] Optionally, the protrusion heights of all the supporting protrusions are the same.

[0013] Optionally, the base plate is a stamped part, and the groove is stamped and formed on the first plate surface.

[0014] Based on the same inventive concept, the second aspect of the present application also provides a battery pack, including a heat exchange component and a battery module as described in the first aspect; the bottom plate is in thermal contact with the heat exchange component through the first heat exchange surface and the second heat exchange surface respectively.

[0015] As can be seen from the above, in the battery module and battery pack provided by the present application, the heat-conducting layer is thermally connected to at least a portion of the surface of the groove of the first plate surface, thereby forming a second heat exchange surface at the location of the groove. When the base plate and the heat exchange assembly are thermally connected, the area of ​​the first plate surface without the groove can contact the heat exchange assembly through the first heat exchange surface, while the area of ​​the first plate surface with the groove can contact the heat exchange assembly through the second heat exchange surface of the heat-conducting layer, which helps to improve the heat exchange effect between the base plate and the heat exchange assembly, thereby enabling more efficient temperature control of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a partial side view of a first battery module according to an embodiment of the present application;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0019] Figure 3 A partial schematic diagram of another battery module according to an embodiment of the present application;

[0020] Figure 4 for Figure 3 An enlarged schematic diagram of part B;

[0021] Figure 5 A partial cross-sectional schematic diagram of a battery module according to an embodiment of the present application;

[0022] Figure 6 for Figure 5 A magnified schematic diagram of part C;

[0023] Figure 7 This is a schematic top view of the bottom plate of the battery module according to an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100, housing; 110, side plate; 111, positioning groove; 120, upper cover; 130, bottom plate; 131, first plate surface; 1311, first heat exchange surface; 132, groove; 1321, groove wall; 1322, groove bottom; 1323, notch; 133, second plate surface; 134, supporting protrusion;

[0026] 200. Battery cell stack;

[0027] 300, heat conducting layer; 310, second heat exchange surface;

[0028] 400. Thermal conductive adhesive layer. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0030] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0031] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] like Figure 1 , Figure 1 The side view of the first battery module is shown. The battery module includes a housing 100, which may include a plurality of housings 100 along the width direction of the housing 100 (e.g., Figure 1 The housing 100 includes two side panels 110 spaced apart in the X direction (in the X direction), an upper cover 120 located above the side panels 110, and a bottom panel 130 located below the side panels 110. The housing 100 may also include two end panels spaced apart and perpendicular to the two side panels 110. The side panels 110 and the end panels may both be supported by the bottom panel 130.

[0035] In some embodiments, in order to adjust the temperature of the battery module, that is, to dissipate heat or heat the battery module, a heat exchange component can be set under the base plate 130, and the heat exchange component can be attached to the surface of the base plate 130 to achieve a heat exchange connection between the base plate 130 and the heat exchange component.

[0036] It is understandable that the larger the contact area between the bottom plate 130 and the heat exchange component, the better the heat exchange effect. Figure 2 , Figure 2 Shown Figure 1 In the enlarged schematic diagram of part A in FIG, in some embodiments, a recessed groove 132 is provided on the surface of the bottom plate 130. In particular, when the bottom plate 130 is a stamped part formed by a stamping process, and a stamped protrusion is provided on one side of the bottom plate 130, a groove 132 corresponding to the protrusion will be formed on the other side. When the groove 132 is located on the surface of the bottom plate 130 that is in contact with the heat exchange component, the surface at the location of the groove 132 will be separated from the heat exchange component, and the contact area between the bottom plate 130 and the heat exchange component will be reduced, and the heat exchange effect between the bottom plate 130 and the heat exchange component will be reduced.

[0037] In order to solve the above problems, Figure 3 , Figure 3 A partial schematic diagram of another battery module is shown. The battery module provided in this embodiment includes a bottom plate 130. Specifically, Figure 4 , Figure 4 Shown Figure 3 In the enlarged schematic diagram of part B, the bottom plate 130 includes a first plate surface 131, the first plate surface 131 is formed with a concave groove 132, and at least a portion of the area of ​​the first plate surface 131 other than the groove 132 is configured as a first heat exchange surface 1311 for contact heat exchange; the heat conducting layer 300 is heat-conductingly connected to at least a portion of the surface of the groove 132, and the notch 1323 of the heat conducting layer 300 near the groove 132 (such as Figure 2 The surface of the groove 132 (the notch 1323 of the groove 132 may be flush with the first heat exchange surface 1311 ) is configured as a second heat exchange surface 310 for contact heat exchange.

[0038] For example, the heat conducting layer 300 may be bonded or clamped to the surface of the groove 132 to achieve a heat conducting connection between the two while ensuring a reliable connection between the heat conducting layer 300 and the base plate 130 .

[0039] Illustratively, the heat-conducting layer 300 may be a heat-conducting pad or a structural layer formed after curing of heat-conducting adhesive.

[0040] When the battery module needs to be thermally connected to the heat exchange assembly, in order to ensure that the groove 132 can also form a thermal connection with the heat exchange assembly, this embodiment installs a thermally conductive layer 300 in the groove 132. The portion of the thermally conductive layer 300 within the groove 132 is thermally connected to at least a portion of the surface of the groove 132, while the surface of the thermally conductive layer 300 near the notch 1323 of the groove 132 is exposed to form a second heat exchange surface 310. When the first plate surface 131 of the bottom plate 130 is thermally connected to the heat exchange assembly, the first heat exchange surface 1311 can contact the heat exchange assembly. At the same time, the thermally conductive layer 300 can also contact the heat exchange assembly through the second heat exchange surface 310, thereby ensuring that the entire first plate surface 131 of the bottom plate 130 can contact and exchange heat with the heat exchange assembly.

[0041] In the battery module provided in the embodiment of the present application, the heat conductive layer 300 is thermally connected to at least a portion of the surface of the groove 132 of the first plate surface 131, thereby forming a second heat exchange surface 310 at the location of the groove 132. When the bottom plate 130 and the heat exchange assembly are thermally connected, the area of ​​the first plate surface 131 without the groove 132 can contact the heat exchange assembly through the first heat exchange surface 1311, while the area of ​​the first plate surface 131 with the groove 132 can contact the heat exchange assembly through the second heat exchange surface 310 of the heat conductive layer 300. This helps to improve the heat exchange effect between the bottom plate 130 and the heat exchange assembly, thereby enabling more efficient temperature control of the battery module.

[0042] like Figure 4 In some embodiments, the heat conducting layer 300 is in contact with and connected to the groove bottom 1322 and / or the groove wall 1321 of the groove 132 .

[0043] The surface of the groove 132 includes a groove bottom 1322 and a groove wall 1321 located on at least one side of the groove bottom 1322. When the thermal conductive layer 300 is directly in contact with the groove bottom 1322 or the groove wall 1321, the thermal conductivity between the thermal conductive layer 300 and the bottom plate 130 can be improved. When the bottom plate 130 is in contact with the heat exchange assembly via the second heat exchange surface 310 of the thermal conductive layer 300, a highly efficient heat exchange path can be formed between the bottom plate 130 and the heat exchange assembly, thereby more effectively controlling the temperature of the battery module.

[0044] like Figure 4 In some embodiments, the thickness of the heat conducting layer 300 is not less than the depth of the groove 132 .

[0045] Exemplarily, the thickness of the heat conducting layer 300 is equal to the depth of the groove 132 , or the thickness of the heat conducting layer 300 is slightly greater than the depth of the groove 132 .

[0046] The thickness of the heat-conducting layer 300 is designed to be no less than the depth of the groove 132. When the heat-conducting layer 300 is installed in the groove 132, even if the heat-conducting layer 300 extends into the groove 132 and contacts and connects with the groove bottom 1322, it can be ensured that the heat-conducting layer 300 is flush with the first heat exchange surface 1311 of the first plate surface 131 or protrudes from the first heat exchange surface 1311. This ensures that when the first plate surface 131 of the bottom plate 130 contacts and thermally connects with the heat exchange component, the second heat exchange surface 310 of the heat-conducting layer 300 can also reliably contact and thermally connect with the heat exchange component.

[0047] like Figure 5 , Figure 5 The figure shows a cross-sectional schematic diagram of a battery module, which also includes a cell stack 200 disposed between the upper cover 120 and the bottom plate 130. An upper adhesive layer (e.g., formed by applying glue to the upper surface of the cell stack 200) is provided on the upper surface of the cell stack 200, thereby bonding the cell stack 200 to the upper cover 120. Similarly, a lower adhesive layer is provided on the lower surface of the cell stack 200, thereby bonding the cell stack 200 to the bottom plate 130.

[0048] At the same time, the cell stack 200 is located in the frame structure surrounded by the two side plates 110 and the two end plates. The cell stack 200 includes a plurality of cells along the width direction of the housing 100 (eg, Figure 5Multiple battery cells are arranged in the X direction (in the X direction). Side adhesive layers can be provided between the battery cell stack 200 and the side panels 110, so that the battery cell stack 200 is bonded and fixed to the two side panels 110 through the side adhesive layers. Exemplarily, the side adhesive layers can be double-sided adhesive foam.

[0049] Combined with the above content, such as Figure 6 , Figure 6 for Figure 5 An enlarged schematic diagram of section C in the middle. In some embodiments, to further improve the heat exchange effect, the lower adhesive layer between the battery cell stack 200 and the base plate 130 can be replaced with a thermally conductive adhesive layer 400 to form an efficient heat transfer channel between the battery cell stack 200 and the base plate 130.

[0050] However, the applicant has found that if the thickness of the thermal conductive adhesive layer 400 is too thin, on the one hand, the thermal conductivity will be poor; on the other hand, the battery cell stack 200 and the metal base plate 130 may be in contact with each other over a large area, thereby causing the insulation and withstand voltage of the thermal conductive adhesive layer 400 to fail.

[0051] In order to prevent the thermal conductive adhesive layer 400 from being too thin, it is necessary to ensure that there is sufficient gap space between the battery cell stack 200 and the surface of the base plate 130 to accommodate the thermal conductive adhesive layer 400. This requires providing a structure on the surface of the base plate 130 that can limit the distance between the battery cell stack 200 and the surface of the base plate 130.

[0052] like Figure 6 In some embodiments, the battery module further includes a cell stack 200 located above the bottom plate 130; the bottom plate 130 includes a second plate surface 133 opposite to the first plate surface 131 and close to the cell stack 200 (i.e., the first plate surface 131 is the lower surface of the bottom plate 130, and the second plate surface 133 is the upper surface of the bottom plate 130), and the second plate surface 133 is formed with a protruding support protrusion 134, and the support protrusion 134 corresponds to the groove 132; along the thickness direction of the bottom plate 130 (such as Figure 6 The battery module further includes a thermally conductive adhesive layer 400 disposed between the battery cell stack 200 and the second plate surface 133, and the battery module is thermally connected to the second plate surface 133 through the thermally conductive adhesive layer 400.

[0053] Illustratively, the supporting protrusion 134 is a boss structure with a flat top, so that when the battery cell stack 200 and the top of the supporting protrusion 134 come into contact, a larger contact area is formed between the two, thereby improving support stability.

[0054] For example, when all of the support protrusions 134 are located directly below the cell stack 200, the projection of the cell stack completely covers all of the support protrusions 134. When a portion of a support protrusion 134 is located directly below the cell stack 200 and another portion extends out of the cell stack 200, the projection of the cell stack covers part of the support protrusion 134.

[0055] The projection of the battery cell stack 200 covers at least part of the support protrusion 134. In other words, at least part of the support protrusion 134 is located directly below the battery cell stack 200 to support the battery cell stack 200. Under the supporting effect of the support protrusion 134, along the thickness direction of the base plate 130, the gap distance between the lower surface of the battery cell stack 200 and the second plate surface 133 is at least equal to the protrusion height h of the support protrusion 134. Then, it can be ensured that the thickness of most areas of the thermal conductive adhesive layer 400 between the battery cell stack 200 and the second plate surface 133 (excluding the area where the support protrusion 134 is provided) is at least equal to h. By designing h based on process parameters such as thermal conductivity and insulation withstand voltage, it can be ensured that the thickness of most areas of the thermal conductive adhesive layer 400 can meet the thermal conductivity and insulation withstand voltage performance requirements.

[0056] When there is only one supporting protrusion 134 , the thermal conductive adhesive layer 400 may be disposed at least around the supporting protrusion 134 .

[0057] To ensure that the support protrusions 134 can stably support the cell stack 200, a large contact area is required between the top of the support protrusions 134 and the cell stack 200. However, this can still lead to insulation breakdown. Reducing the contact area between the top of the support protrusions 134 and the cell stack 200 can further mitigate insulation breakdown, but a single support protrusion 134 will struggle to stably support the cell stack 200. This can cause the thermal adhesive layer 400 to become locally thinner when the cell stack 200 tilts.

[0058] In order to solve the above problems, Figure 6 In some embodiments, at least two supporting protrusions 134 are arranged at intervals, and the thermal conductive adhesive layer 400 is located at least between two adjacent supporting protrusions 134 .

[0059] For example, the support protrusion 134 can be arranged along the length direction of the bottom plate 130 (eg Figure 6 The Y direction in the figure) can also be arranged at intervals along the width direction of the bottom plate 130 (such as Figure 7 (X direction in) interval settings.

[0060] By having at least two supporting protrusions 134 jointly support the cell stack 200, the support protrusions 134 can maintain a small contact area with the cell stack 200 while also providing relatively stable support for the cell stack 200. This ensures that the thickness of the thermally conductive adhesive layer 400 between two adjacent supporting protrusions 134 is relatively uniform and meets the requirements for thermal conductivity and insulation withstand voltage.

[0061] like Figure 1 In some embodiments, the battery module includes a side plate 110. The side plate 110 is connected to the circumferential side wall of the battery cell stack 200. Figure 2 , the bottom end of the side plate 110 abuts against the second plate surface 133 of the bottom plate 130. Figure 6 The battery cell stack 200 is separated from the top of the supporting protrusion 134 , and the thermal conductive adhesive layer 400 extends between the battery cell stack 200 and the supporting protrusion 134 .

[0062] When the cell stack 200 and the side plate 110 are connected, the distance between the bottom end of the cell stack 200 and the bottom end of the side plate 110 along the height direction of the cell stack 200 (eg Figure 1 The distance in the Z direction) between the battery cell stack 200 and the side plate 110 (hereinafter referred to as the Z-direction distance). For example, the bottom end of the battery cell stack 200 can be made parallel to the bottom edge of the side plate 110 to ensure that the battery cell stack 200 is maintained at the same height along the length direction. At the same time, since the bottom end of the side plate 110 is in contact with the second plate surface 133 of the bottom plate 130, the Z-direction distance between the bottom end of the battery cell stack 200 and the bottom end of the side plate 110 is also the gap distance between the bottom surface of the battery cell stack 200 and the second plate surface 133, that is, when the battery cell stack 200 and the side plate 110 are connected, the gap distance between the battery cell stack 200 and the second plate surface 133 of the bottom plate 130 can be controlled in advance.

[0063] The battery cell stack 200 and the top of the supporting protrusion 134 are separated, so that the thermal conductive adhesive layer 400 can also be present between the battery cell stack 200 and the supporting protrusion 134, further reducing the risk of insulation withstand voltage failure.

[0064] If the size and weight of the battery cell stack 200 are large, when part of the battery cell stack 200 falls during transportation, the fallen part will also be stably supported by the support protrusion 134, that is, the support protrusion 134 can correct the position of the fallen battery cell stack 200, ensuring that the gap distance between the battery cell stack 200 and the second plate surface 133 is not less than the protrusion height h of the support protrusion 134, thereby ensuring the thermal conductivity and insulation voltage resistance of the thermal conductive adhesive layer 400.

[0065] like Figure 7 , Figure 7FIG1 shows a schematic diagram of a top view of the bottom plate 130. In some embodiments, the support protrusion 134 extends to the edge of the second plate surface 133. Figure 2 The side plate 110 intersects with the support protrusion 134 , and a positioning groove 111 matching the support protrusion 134 is provided at the bottom end of the side plate 110 .

[0066] For example, the extending direction of the support protrusion 134 may be the width direction of the bottom plate 130 ; or, the extending direction of the support protrusion 134 may intersect with the length direction of the bottom plate 130 .

[0067] Exemplarily, the longitudinal cross-section of the support protrusion 134 is a trapezoid, and the top corners of the trapezoid may be rounded.

[0068] Illustratively, the positioning groove 111 may pass through two opposite surfaces of the side plate 110 along the thickness direction of the side plate 110 .

[0069] By designing the support protrusions 134 to extend to the edge of the second plate surface 133, the support protrusions 134 near the edge of the second plate surface 133 can cooperate with the positioning grooves 111 at the bottom of the side panels 110 to form a positioning structure, thereby reducing the difficulty of positioning the side panels 110 and the bottom panel 130. Furthermore, if the bottom panel 130 is a stamped part, the structure of this embodiment also helps to reduce the precision requirements of the stamping die, thereby reducing the difficulty and cost of forming the bottom panel 130.

[0070] Similar to the above, when connecting the cell stack 200 and the side plate 110 , the gap distance between the cell stack 200 and the top of the support protrusion 134 can be pre-controlled by controlling the distance between the bottom end of the cell stack 200 and the bottom of the positioning groove 111 .

[0071] like Figure 6 In some embodiments, the protrusion heights h of all support protrusions 134 are the same.

[0072] All support protrusions 134 have the same height. When the battery cell stack 200 and the top of the support protrusions 134 are separated, the thickness of the thermally conductive adhesive layer 400 located above each support protrusion 134 is uniform. When the battery cell stack 200 abuts the top of the support protrusions 134, the support protrusions 134 with the same height also ensure a uniform gap between the battery cell stack 200 and the second plate surface 133, ensuring that the thickness of the thermally conductive adhesive layer 400 is uniform over most of the battery cell stack 200 and meets the thermal conductivity and insulation withstand voltage requirements.

[0073] In some embodiments, the bottom plate 130 is a stamped part, and the groove 132 is stamped and formed on the first plate surface 131 of the bottom plate 130 .

[0074] The bottom plate 130 is formed by a stamping process, which can ensure the molding quality of the bottom plate 130 while reducing the molding difficulty, shortening the molding time, and reducing the molding cost, thereby facilitating mass production.

[0075] During the stamping process, the mold squeezes the first plate surface 131 so that a portion of the bottom plate 130 bends toward the second plate surface 133 to form a supporting protrusion 134 , and the squeezed portion of the first plate surface 131 forms a concave groove 132 .

[0076] Based on the same inventive concept and in combination with the description of the battery modules of the above embodiments, this embodiment provides a battery pack having the corresponding technical effects of the battery modules of the above embodiments, which will not be described in detail here.

[0077] A battery pack includes a heat exchange assembly and a battery module as described in each of the above embodiments; the bottom plate 130 is in thermal contact with the heat exchange assembly through the first heat exchange surface 1311 and the second heat exchange surface 310 respectively.

[0078] Exemplarily, the heat exchange component may be a heat exchange plate (such as a liquid cooling plate).

[0079] For example, the first plate surface 131 may be in direct contact with the heat exchange component to achieve contact heat conduction between the two; or, the first plate surface 131 may be in indirect contact with the heat exchange component via a heat conducting medium to achieve contact heat conduction between the two.

[0080] It should be noted that the above description only describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0081] The various embodiments in this application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] The description of this application is provided for purposes of illustration and description and is not intended to be exhaustive or to limit the application to the disclosed form. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the application and to enable those skilled in the art to understand the application and design various embodiments with various modifications suitable for specific applications.

[0083] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0084] While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0085] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A battery module, characterized in that: include: The bottom plate comprises a first plate surface, wherein a concave groove is formed on the first plate surface, and at least a portion of the first plate surface except the groove is configured as a first heat exchange surface for contact heat exchange; A heat-conducting layer is heat-conductingly connected to at least a portion of the surface of the groove, and a surface of the heat-conducting layer close to the notch of the groove is configured as a second heat exchange surface for contact heat exchange.

2. The battery module according to claim 1, wherein: The heat conducting layer is in contact with the groove bottom and / or the groove wall of the groove.

3. The battery module according to claim 1, wherein: The thickness of the heat conducting layer is not less than the depth of the groove.

4. The battery module according to claim 1, wherein: The battery module further includes a cell stack located above the base plate, the base plate including a second plate surface opposite to the first plate surface and adjacent to the cell stack, the second plate surface being formed with a protruding support protrusion corresponding to the groove; along the thickness direction of the base plate, the orthographic projection of the cell stack on the second plate surface covers at least a portion of the support protrusion; The battery module further includes a thermally conductive adhesive layer disposed between the battery cell stack and the second plate surface, and the battery module is thermally connected to the second plate surface via the thermally conductive adhesive layer.

5. The battery module according to claim 4, characterized in that: At least two supporting protrusions are arranged at intervals, and the thermal conductive adhesive layer is located at least between two adjacent supporting protrusions.

6. The battery module according to claim 5, characterized in that: The battery module includes a side plate, which is connected to the circumferential side wall of the battery cell stack, the bottom end of the side plate abuts the second plate surface of the bottom plate, the battery cell stack is separated from the top of the support protrusion, and the thermal conductive adhesive layer extends between the battery cell stack and the support protrusion.

7. The battery module according to claim 6, characterized in that: The supporting protrusion extends to the edge of the second plate surface, the side plate intersects with the supporting protrusion, and the bottom end of the side plate is provided with a positioning groove matching the supporting protrusion.

8. The battery module according to claim 5, characterized in that: The protrusion heights of all the supporting protrusions are the same.

9. The battery module according to claim 1, wherein: The bottom plate is a stamped part, and the groove is stamped and formed on the first plate surface.

10. A battery pack, characterized in that: It comprises a heat exchange component and a battery module according to any one of claims 1 to 9; the bottom plate is in thermal contact with the heat exchange component through the first heat exchange surface and the second heat exchange surface respectively.

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