Battery pack and electric device

Abstract

The application discloses a battery pack and an electric equipment, and belongs to the technical field of battery packs. The battery pack comprises a plurality of battery cells, wherein each battery cell comprises a first wall; a cooling plate, wherein the cooling plate comprises at least one cooling wall, each cooling wall is in contact with at least one battery cell, and the cooling wall is matched with the first wall; the cooling wall comprises a first protruding part and a first recessed part; the first wall comprises a second protruding part and a second recessed part; and the first recessed part is connected with the second protruding part, and / or the first protruding part is connected with the second recessed part. The cooling wall with the first protruding part and the first recessed part can increase the contact area between the battery cell and the cooling plate, improve the space utilization, and further improve the cooling effect.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] With the continuous development of the new energy industry, the demand for power batteries is increasing, and the performance requirements for power batteries are also getting higher and higher. In particular, the cooling of battery packs and the control of the stacking dimensions of cell modules and liquid cooling plates are the difficulties in the process.

[0003] Currently, most battery pack cooling systems on the market use large-area contact cooling, which has a small contact area and low space utilization, making it difficult to achieve good cooling results. The stacking of battery cell modules and the assembly of the liquid cooling plate are performed using different tooling for positioning and assembly; typically, one liquid cooling plate tooling needs to be matched with multiple battery cell module stacking toolings. This assembly method is complex and suffers from poor consistency in stacked dimensions. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and electrical device that can solve at least some of the problems mentioned above.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a battery pack, comprising: a plurality of battery cells, each battery cell including a first wall having an uneven surface; a cooling plate; the cooling plate including at least one cooling wall, each cooling wall being in contact with at least one battery cell, and the cooling wall and the first wall being adapted to each other; the cooling wall including a first protrusion and a first recess; the first wall including a second protrusion and a second recess; wherein the first recess and the second protrusion are connected, and / or the first protrusion and the second recess are connected.

[0007] In this embodiment, the cooling plate is used to cool the battery cell. By contacting the first wall of the battery cell, heat exchange is achieved between the cooling plate and the battery cell, thereby cooling the battery cell. To increase the heat exchange area, the cooling plate is typically positioned to contact the largest surface of the battery cell. Furthermore, compared to a flat surface, making the cooling wall uneven increases the surface area, thus increasing the heat exchange area and further improving the heat exchange efficiency between the cooling plate and the battery cell.

[0008] Furthermore, the cooling wall includes multiple first protrusions and multiple first recesses. The first protrusions can protrude in a positive direction, and the first recesses can protrude in a negative direction, or vice versa. Understandably, compared to a flat surface, providing protrusions along the first or second direction increases the area of ​​the cooling wall, thereby increasing the heat exchange area and further improving the heat exchange efficiency between the cooling plate and the battery cell.

[0009] In the embodiments of this application, by setting an uneven cooling wall and setting a plurality of first protrusions and a plurality of first recesses on the cooling wall, the contact area between the battery cell and the cooling plate is increased, the space utilization is improved, and thus the cooling effect is improved.

[0010] Furthermore, since one of the first protrusion and the first recess protrudes in the positive direction and the other in the negative direction, and the cooling wall is adapted to the first wall when the cooling wall and the battery cell are in contact, it is understandable that the first protrusion and the first recess naturally fit with the first wall, which facilitates the assembly between the battery cell and the cooling plate, and has the beneficial effect of simplifying the assembly method and reducing the requirements for dimensional accuracy.

[0011] It should be noted that the cooling plate has two cooling walls, which can each contact at least two battery cells, or only one cooling wall can contact a battery cell. This embodiment does not impose any limitations on this.

[0012] Optionally, in this embodiment of the application, a plurality of first protrusions and a plurality of first recesses are alternately arranged and interconnected along the second direction and / or the third direction; wherein, the second direction is the length direction of the battery cell, and the third direction is the height direction of the battery cell.

[0013] Optionally, in the embodiments of this application, the cooling wall is in the shape of a frustum or a pyramid.

[0014] Optionally, in the embodiments of this application, at least one of the first protrusion and the first recess is in the shape of a frustum or a pyramid.

[0015] Optionally, in this embodiment of the application, there is a preset gap between the center of the cooling wall and the first wall.

[0016] Optionally, in this embodiment of the application, there is a preset gap between the cooling wall and the first wall, and the gap between the cooling wall and the first wall gradually decreases in the direction extending from the center of the cooling wall to the surrounding area.

[0017] Optionally, in this embodiment of the application, the battery pack further includes an elastic thermally conductive layer disposed between the first wall and the cooling wall, and the elastic thermally conductive layer is deformable.

[0018] Optionally, in this embodiment of the application, a plurality of second protrusions and a plurality of second recesses are alternately arranged and interconnected along the second direction and the third direction.

[0019] Optionally, in this embodiment of the application, the first wall is the surface with the largest surface area in the battery cell.

[0020] Secondly, embodiments of this application also provide an electrical device, including the battery pack as described above. Attached Figure Description

[0021] Figure 1 This is a partial structural schematic diagram of the battery pack in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the cooling plate structure in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the battery cell structure in an embodiment of this application;

[0024] Figure 4 This is a partial cross-sectional structural diagram of the cooling plate in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10. Battery cell; 11. First wall; 111. Second protrusion; 112. Second recess; 20. Cooling plate; 21. Cooling wall; 211. First protrusion; 212. First recess; 22. Connecting surface; 23. Liquid inlet; 24. Liquid outlet; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] The battery pack and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0030] See Figures 1 to 4 An embodiment of this application provides a battery pack, including: a plurality of battery cells 10, each battery cell 10 including a first wall 11; a cooling plate 20; the cooling plate 20 including at least one cooling wall 21, each cooling wall 21 being in contact with at least one battery cell 10, and the cooling wall 21 and the first wall 11 being adapted to each other; the cooling wall 21 including a first protrusion 211 and a first recess 212; the first wall 11 including a second protrusion 111 and a second recess 112; wherein the first recess 212 and the second protrusion 111 are connected, and / or the first protrusion 211 and the second recess 112 are connected.

[0031] In this embodiment, the cooling plate 20 is configured to cool the battery cell 10. By contacting the first wall 11 of the battery cell 10, heat exchange is achieved between the cooling plate 20 and the battery cell 10, thereby cooling the battery cell 10. To increase the heat exchange area, the cooling plate 20 is typically configured to contact the largest surface of the battery cell 10. Furthermore, compared to a flat surface, making the cooling wall 21 an uneven surface increases the area, thereby increasing the heat exchange area and further improving the heat exchange efficiency between the cooling plate 20 and the battery cell 10.

[0032] Furthermore, the cooling wall 21 may include a plurality of first protrusions 211 and a plurality of first recesses 212, wherein the first protrusions 211 may protrude in a positive direction and the first recesses 212 may protrude in a negative direction, or the first protrusions 211 may protrude in a negative direction and the first recesses 212 may protrude in a positive direction. It is understandable that, compared to a flat plane, providing the first protrusions 211 or the first recesses 212 along the first direction X or the second direction Y can increase the area of ​​the cooling wall 21, thereby increasing the heat exchange area and further improving the heat exchange efficiency between the cooling plate 20 and the battery cell 10.

[0033] In this embodiment of the application, by setting an uneven cooling wall 21 and setting a plurality of first protrusions 211 and a plurality of first recesses 212 on the cooling wall 21, the contact area between the battery cell 10 and the cooling plate 20 is increased, the space utilization is improved, and thus the cooling effect is improved.

[0034] Furthermore, since one of the first protrusion 211 and the first recess 212 protrudes in the positive direction and the other in the negative direction, and when the cooling wall 21 and the battery cell 10 are in contact, and the first wall 11 of the battery cell 10 is also provided with a second protrusion 111 and a second recess 112, the cooling wall 21 is adapted to the first wall 11, and the first recess 212 is connected to the second protrusion 211, or the first protrusion 211 and the second recess 112 are connected, or the first recess 212 is connected to the second protrusion 211, and the first protrusion 211 and the second recess 112 are connected. It is understandable that both the first protrusion 211 and the first recess 212 naturally engage with the first wall 11, facilitating the assembly between the battery cell 10 and the cooling plate 20, thus simplifying the assembly process and reducing the requirements for dimensional accuracy.

[0035] It should be noted that the cooling plate 20 may also include two cooling walls 21. The two cooling walls 21 may be arranged opposite to each other along the first direction X. The two cooling walls 21 may contact at least two battery cells 10 respectively, or only one cooling wall 21 may contact the battery cell 10. This embodiment does not make any limitation on this.

[0036] Optionally, in this embodiment of the application, the battery pack has a first direction X, a second direction Y and a third direction Z, the first direction X, the second direction Y and the third direction Z are perpendicular, and along the second direction Y and / or the third direction Z, a plurality of first protrusions 211 and a plurality of first recesses 212 are alternately arranged and interconnected; wherein, the second direction Y is the length direction of the cell 10 and the third direction Z is the height direction of the cell 10.

[0037] It should be noted that "pairwise intersection" can be a perpendicular intersection, or an intersection at an acute or obtuse angle. Preferably, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0038] In this embodiment, along the length of the cell 10, a plurality of first protrusions 211 and a plurality of first recesses 212 can contact the first wall 11 of the cell 10 through the top protrusions and bottom recesses. Compared with the planar contact in the prior art, the above arrangement transforms point / line contact into multi-point contact, which can effectively increase the heat exchange area and reduce the thermal resistance of the contact surface.

[0039] Similarly, along the height direction of the cell 10, a plurality of first protrusions 211 and a plurality of first recesses 212 can contact the first wall 11 of the cell 10 through the top protrusions and bottom recesses. Compared with the planar contact in the prior art, the above arrangement transforms point / line contact into multi-point contact, which can effectively increase the heat exchange area and reduce the thermal resistance of the contact surface.

[0040] Furthermore, along the length and height directions of the cell 10, a first protrusion 211 and a plurality of first recesses 212 can contact the first wall 11 of the cell 10 through the top protrusion and the bottom recess. Compared with the planar contact in the prior art, the above arrangement transforms point / line contact into multi-point contact, which can effectively increase the heat exchange area and reduce the thermal resistance of the contact surface.

[0041] Meanwhile, the simultaneous provision of a first protrusion 211 and a first recess 212 along the positive and negative directions on the contact surface provides a tolerance range for the assembly error between the cooling plate 20 and the cell 10, thereby achieving the beneficial effect of compensating for the expansion or manufacturing tolerance of the cell 10 and reducing the precision of battery pack assembly.

[0042] Optionally, in the embodiments of this application, the cooling wall 21 is in the shape of a frustum or a pyramid.

[0043] In this embodiment, the frustum-shaped or truncated pyramidal cooling wall 21 design increases the heat exchange area between the cooling plate 20 and the battery cell 10 compared to planar contact, resulting in a significant improvement in heat conduction efficiency. Specifically, the frustum-shaped or truncated pyramidal cooling wall 21 may protrude or be recessed relative to the battery cell 10 as a whole, and the first protrusion 211 and the first recess 212 provided on the cooling wall 21 may protrude in the positive direction or in the negative direction relative to the surface of the cooling wall 21. This embodiment does not impose any limitations on this.

[0044] Meanwhile, the progressive contact between the frustum or prismatic shape and the first surface of the cell 10 can avoid local stress concentration in planar contact, ensure uniform pressure distribution, and have the beneficial effect of reducing contact thermal resistance.

[0045] Furthermore, the volume expansion of the battery cell 10 during charging and discharging will slide along the inclined surface of the frustum or prism, which has the beneficial effect of avoiding plastic deformation caused by hard compression from planar contact.

[0046] Meanwhile, the aforementioned frustum or truncated cone structure creates a self-centering effect during assembly, which has the beneficial effect of reducing the positioning accuracy requirements of the battery cell 10 and the cooling plate 20 and improving the yield of the production line.

[0047] Optionally, in the embodiments of this application, at least one of the first protrusion 211 and the first recess 212 is in the shape of a frustum or a pyramid.

[0048] In the embodiments of this application, the frustum or truncated pyramid shape can effectively increase the heat exchange area, thereby improving the heat transfer efficiency. For example, the first protrusion 211 is a frustum or truncated pyramid, and the first recess 212 is a plane; or, the first protrusion 211 is a plane, and the first recess 212 is a frustum or truncated pyramid; or, both the first protrusion 211 and the first recess 212 are frustums; or, both the first protrusion 211 and the first recess 212 are truncated pyramids.

[0049] Optionally, in this embodiment of the application, there is a preset gap between the center of the cooling wall 21 and the first wall 11.

[0050] In this embodiment, in practical applications, the battery cell 10 undergoes volume expansion during charging and discharging, with the central region of the battery cell 10 exhibiting the greatest expansion during charging and discharging. The preset gap between the center of the cooling wall 21 and the first wall 11 provides directional release space for the expansion of the battery cell 10, which has the beneficial effect of avoiding stress concentration inside the battery cell 10 caused by the rigid pressure of the cooling plate 20.

[0051] Optionally, in this embodiment of the application, there is a preset gap between the cooling wall 21 and the first wall 11, and the gap between the cooling wall 21 and the first wall 11 gradually decreases in the direction extending from the center of the cooling wall 21 to the surrounding area.

[0052] In this embodiment, the expansion amount in the central region of the battery cell 10 is the largest and the expansion amount in the edge region is the smallest when the battery cell 10 is charged and discharged. The change of the above-mentioned gradual gap can match the degree of expansion of the battery cell 10, accurately adapt to the expansion deformation of the battery cell 10, and has the beneficial effect of avoiding local stress concentration in the battery cell 10.

[0053] Furthermore, the large central gap reduces direct contact and forces heat to be conducted to the high thermal conductivity edge area. The small gaps around the perimeter maintain close contact, ensuring an efficient heat conduction path. The embodiments of this application further improve the heat dissipation efficiency of the battery cell 10.

[0054] Optionally, in this embodiment of the application, the battery pack further includes an elastic thermal conductive layer disposed between the first wall 11 and the cooling wall 21, and the elastic thermal conductive layer is deformable.

[0055] In this embodiment, the elastic thermally conductive layer can deform under pressure, filling the unevenness between the first wall 11 and the cooling wall 21. During the cyclic expansion of the battery cell 10, the elastic thermally conductive layer absorbs deformation energy through elastic energy storage, avoiding internal damage to the battery cell 10 caused by hard contact.

[0056] Furthermore, the elastic matrix of the elastic thermal conductive layer can be silicone rubber / polyurethane, filled with boron nitride or carbon fiber, which can absorb transient thermal shock and has the beneficial effect of reducing the heat of the battery cell.

[0057] Optionally, in the embodiments of this application, a plurality of second protrusions 111 and a plurality of second recesses 112 are alternately arranged and interconnected along the second direction Y and the third direction Z.

[0058] In this embodiment, along the length of the cell 10, a plurality of second protrusions 111 and a plurality of second recesses 112 can contact the cooling wall 21 through protrusions in the positive and negative directions. Compared with the planar contact in the prior art, the above arrangement transforms point / line contact into multi-point contact, which can effectively increase the heat exchange area and reduce the thermal resistance of the contact surface.

[0059] Similarly, along the height direction of the cell 10, a plurality of second protrusions 111 and a plurality of second recesses 112 can contact the cooling wall 21 through protrusions in the positive and negative directions. Compared with the planar contact in the prior art, the above arrangement transforms point / line contact into multi-point contact, which can effectively increase the heat exchange area and reduce the thermal resistance of the contact surface.

[0060] Furthermore, along the length and height directions of the cell 10, a plurality of second protrusions 111 and a plurality of second recesses 112 can contact the cooling wall 21 through protrusions in the positive and negative directions. Compared with the planar contact in the prior art, the above arrangement transforms point / line contact into multi-point contact, which can effectively increase the heat exchange area and reduce the thermal resistance of the contact surface.

[0061] Meanwhile, the simultaneous provision of a second protrusion 111 and a second recess 112 along both the positive and negative directions on the contact surface provides a tolerance range for the assembly error between the cooling plate 20 and the cell 10, thereby achieving the beneficial effect of compensating for the expansion or manufacturing tolerance of the cell 10 and reducing the precision of battery pack assembly.

[0062] Optionally, in this embodiment, the first wall 11 is the surface with the largest surface area in the battery cell 10.

[0063] In this embodiment, the first wall 11 is set as the surface with the largest area of ​​the battery cell 10, and it contacts and fits with the cooling wall 21. This can significantly increase the heat exchange area, and also allows for a concave-convex fit with the cooling plate 20 on the largest surface. The embodiments of this application have the beneficial effects of improving heat exchange efficiency and enhancing connection strength.

[0064] Secondly, embodiments of this application also provide an electrical device, including the battery pack as described above.

[0065] In this embodiment, the electrical equipment includes the battery pack as described above, and also includes all the technical features and beneficial effects of the battery pack, which will not be repeated here.

[0066] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0067] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells (10), each battery cell (10) including a first wall (11); A cooling plate (20) includes at least one cooling wall (21), each of the cooling walls (21) being in contact with at least one of the battery cells (10), and the cooling wall (21) being adapted to the first wall (11); The cooling wall (21) includes a first protrusion (211) and a first recess (212); The first wall (11) includes a second protrusion (111) and a second recess (112); Wherein, the first recessed portion (212) and the second protruding portion (111) are connected, and / or the first protruding portion (211) and the second recessed portion (112) are connected.

2. The battery pack according to claim 1, characterized in that, The battery pack has a first direction (X), a second direction (Y) and a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular, and along the second direction (Y) and / or the third direction (Z), a plurality of first protrusions (211) and a plurality of first recesses (212) are alternately arranged and interconnected. Wherein, the second direction (Y) is the length direction of the battery cell (10), and the third direction (Z) is the height direction of the battery cell (10).

3. The battery pack according to claim 1, characterized in that, The cooling wall (21) is in the shape of a frustum or a pyramid.

4. The battery pack according to claim 2, characterized in that, At least one of the first protrusion (211) and the first recess (212) is frustum-shaped or prismatic.

5. The battery pack according to claim 1, characterized in that, There is a predetermined gap between the center of the cooling wall (21) and the first wall (11).

6. The battery pack according to claim 1, characterized in that, There is a preset gap between the cooling wall (21) and the first wall (11). The gap between the cooling wall (21) and the first wall (11) gradually decreases in the direction extending from the center of the cooling wall (21) to the surrounding area.

7. The battery pack according to claim 1, characterized in that, The battery pack also includes an elastic thermal conductive layer disposed between the first wall (11) and the cooling wall (21), and the elastic thermal conductive layer is deformable.

8. The battery pack according to claim 2, characterized in that, Along the second direction (Y) and the third direction (Z), a plurality of second protrusions (111) and a plurality of second recesses (112) are alternately arranged and interconnected.

9. The battery pack according to claim 1, characterized in that, The first wall (11) is the surface with the largest surface area in the battery cell (10).

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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