Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment. The battery pack includes: a case; the cold plate is fixed on the box body; the battery cell is arranged above the cold plate and is bonded with the cold plate; the first reinforcing pieces are arranged below the cold plate and located on the edge areas of the two sides of the cold plate, and the first reinforcing pieces are bonded with the cold plate. According to the utility model, the first reinforcer and the cold plate are bonded into a whole, so that the rigidity of the cold plate in the area is improved, the deformation of the cold plate under the working condition of vibration impact is reduced, and the risk of degumming of the cold plate and the battery cell is further reduced.

Description

Technical Field

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

[0002] With the advancement of power battery pack technology, the stresses on the cold plate, a key load-bearing component in CTP (Cell to Pack) battery packs, are receiving increasing attention. The stress and strain of the liquid cold plate must meet design requirements under impact and vibration conditions. Controlling the stress and deformation of the liquid cold plate can effectively reduce the debonding rate between the battery cell and the cold plate in CTP battery packs. If debonding occurs, it will pose a significant safety hazard to the battery pack. Utility Model Content

[0003] The present application provides a battery pack and an electrical device to solve or at least improve the problems in the above-mentioned background technology.

[0004] On one hand, the present application provides a battery pack, comprising: a box body; a cold plate, the cold plate being fixed to the box body; a battery cell, the battery cell being arranged above the cold plate and bonded to the cold plate; a first reinforcement, the first reinforcement being arranged below the cold plate and located in the edge areas on both sides of the cold plate, and the first reinforcement being bonded to the cold plate.

[0005] By arranging a first reinforcement in the area on both sides of the cold plate, the first reinforcement is bonded to the cold plate as an integral whole, thereby improving the stiffness of the cold plate in this area, reducing the deformation of the cold plate under vibration and impact conditions, and further reducing the risk of debonding between the cold plate and the battery cell, thereby improving the safety and reliability of the battery pack.

[0006] In some embodiments, the first reinforcement is strip-shaped and extends along the length direction of the cold plate; the length of the first reinforcement is L1, the width of the first reinforcement is W1, the length of the cold plate is L, and the width of the cold plate is W; the range of L1 / L is [0.8, 1.0]; and / or the range of W1 / W is [0.05, 0.10].

[0007] In some embodiments, the cold plate includes a first plate and a second plate that are oppositely disposed, and a flow channel is stamped on the second plate; the first reinforcement member includes an avoidance portion, and the avoidance portion is used to avoid the flow channel.

[0008] In some embodiments, the first reinforcement is made of metal and is manufactured by an extrusion process.

[0009] In some embodiments, the first reinforcement member is provided with a cavity.

[0010] In some embodiments, the first reinforcement member is further fixed to the box body by fasteners.

[0011] In some embodiments, the box body includes a first frame located at an end of the box body, and the first frame is made by a die-casting process; the end of the first reinforcement is fixed to the first frame by the fastener.

[0012] In some embodiments, the battery pack further includes a second reinforcement member, which is disposed below the cold plate and located in a middle area of ​​the cold plate, and the second reinforcement member is bonded to the cold plate.

[0013] In some embodiments, the second reinforcement is further fixed to the box body by fasteners.

[0014] In some embodiments, the battery pack further includes a buffer component, which is adhered to the lower surface of the cold plate and avoids the first reinforcement component.

[0015] Finally, the present application also provides an electrical device, which includes the battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the battery pack of an embodiment of the present application (the bottom guard plate is omitted).

[0017] Figure 2 This is a bottom view of the battery pack of an embodiment of the present application (the bottom guard plate is omitted).

[0018] Figure 3 This is a cross-sectional view of the battery pack in the area where the first reinforcement is located in an embodiment of the present application.

[0019] Figure 4 This is a cross-sectional view of the battery pack in the area where the second reinforcement is located in an embodiment of the present application.

[0020] Figure 5 This is a schematic diagram of the connection between the second reinforcement and the first frame in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following description sets forth many specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] In the description of the present invention, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some implementation methods" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention.

[0025] See also Figures 1 to 5 , provides a battery pack, comprising: a box body 100, a cold plate 200 fixed on the box body 100, a battery cell 300 arranged in the box body 100, and a bottom guard plate 400. Figure 1 and Figure 2 This is a bottom view of the battery pack, with the bottom guard plate omitted.

[0026] Specifically, the box body 100 includes a frame and a crossbeam and a longitudinal beam (not shown) arranged in the frame, wherein the crossbeam and the longitudinal beam are fixedly connected to the frame. The frame is composed of a first frame 110 and a side beam 120 located at the end, and is rectangular as a whole. In the present embodiment, the first frame 110 is made by a die-casting process, and the side beam 120 is made by an extrusion process. Then the first frame 110 and the side beam 120 are spliced ​​together by welding and fasteners, so that the die-casting process can be simplified and the manufacturing cost can be controlled while taking into account the strength. Of course, in some other embodiments, the frame can also be made by an integral die-casting method, or by splicing multiple sections of profiles, which does not deviate from the essence of the present application.

[0027] See also Figure 3 The cold plate 200 is fixed to the housing 100. For example, the edges of the cold plate 200 are fixed to the frame of the housing 100 using screws 130 or welding. In this embodiment, the cold plate 200 is a stamped cold plate. In other words, the cold plate 200 includes a first plate 210 and a second plate 220 disposed opposite each other. A flow channel 230 is stamped into the second plate 220 for the flow of the heat exchange medium.

[0028] The battery cell 300 is arranged above the cold plate 200 and bonded to the cold plate 200. Exemplarily, bonding is performed by thermally conductive structural adhesive, so that the cold plate and the battery cell exchange heat, thereby keeping the battery cell operating at a suitable temperature. It is understandable that there are multiple battery cells 300, which are arranged in sequence. In this embodiment, the battery cell 300 is a square shell battery cell, arranged in multiple rows and columns, and is arranged in a receiving cavity surrounded by a frame, a crossbeam, and a longitudinal beam. In some other embodiments, the battery cell may also be a blade battery cell, a soft-pack battery cell, a cylindrical battery cell, etc., which is not specifically limited here.

[0029] A bottom guard plate 400 is also provided below the cold plate 200 and is also fixedly connected to the frame. For example, the bottom guard plate 400 is spaced apart from the cold plate 200 to form a bottom impact space for the battery pack, ensuring the impact resistance of the bottom of the battery pack.

[0030] When the battery pack is exposed to impact and vibration conditions, the cold plate will undergo corresponding deformation. If the deformation at key positions of the cold plate is too large, there will be a risk of debonding between the cold plate and the battery cells. Once debonding occurs, the stiffness of the battery pack will not meet the design requirements, posing a safety hazard.

[0031] The applicant's research has found that the edge areas on both sides of the cold plate are the areas that experience the greatest deformation under extreme impact and vibration conditions of the battery pack. Therefore, in this embodiment, the battery pack further includes a first reinforcement member 510 . The first reinforcement member 510 is disposed below the cold plate 200 and located at the edge areas on both sides of the cold plate 200 . Furthermore, the first reinforcement member 510 is bonded to the cold plate 200 . Exemplarily, the first reinforcement member 510 and the cold plate 200 are bonded using structural adhesive to ensure bonding strength.

[0032] In this way, by arranging the first reinforcement 510 in the area where the cold plate deforms the most under extreme conditions of impact and vibration of the battery pack, that is, the area on both sides of the cold plate, the first reinforcement 510 is bonded to the cold plate 200 as a whole, thereby improving the stiffness of the cold plate in this area, reducing the deformation of the cold plate under vibration and impact conditions, and further reducing the risk of debonding between the cold plate and the battery cell, thereby improving the safety and reliability of the battery pack.

[0033] For details, see also Figure 2 The first reinforcement member 510 is strip-shaped and extends along the length of the cold plate 200. In this embodiment, the length of the first reinforcement member is L1, the width of the first reinforcement member is W1, the length of the cold plate is L, and the width of the cold plate is W. The range of L1 / L is [0.8, 1.0], and the range of W1 / W is [0.05, 0.10]. For example, L1 / L is 0.95, and W1 / W is 0.07.

[0034] It should be noted that since the cold plate is shaped like a matrix, it typically has a protruding area at one end along its length to provide a liquid inlet and return port, etc. Therefore, in this embodiment, the length of the cold plate refers to the length of the cold plate edge area. The first reinforcement member also shaped like a matrix, with its length being the maximum length along its length direction and its width being the maximum width along its width direction.

[0035] In a specific embodiment, the length L1 of the first reinforcement member is 1600 mm, and the width W1 of the first reinforcement member is 90 mm.

[0036] By adjusting the shape parameters of the first reinforcement, the first reinforcement achieves a balanced improvement in cold plate stiffness without significantly increasing the weight of the battery pack. In other words, if the first reinforcement is too large, while the stiffness requirements can be met, the weight of the battery pack will be significantly increased. If the first reinforcement is too small, while the weight gain can be reduced, the contribution to stiffness improvement is limited. Therefore, in this embodiment, setting L1 / L and W1 / W within the above ranges achieves excellent overall performance, balancing the weight and stiffness design requirements of the battery pack.

[0037] In this embodiment, the first reinforcement member 510 is made of metal, such as aluminum, and is manufactured through an extrusion process. Furthermore, the first reinforcement member 510 is provided with a cavity. The aluminum and cavity configuration also help reduce the overall weight of the battery pack. In other embodiments, the first reinforcement member 510 may be a plate-like structure without a cavity, which further simplifies the manufacturing process.

[0038] In order to make the first reinforcement 510 fit more closely to the lower surface of the cold plate 200 and reduce the Z-direction dimension of the battery pack, the first reinforcement 510 includes a flat portion 5101 and an avoidance portion 5102 , wherein the avoidance portion 5102 is used to avoid the flow channel 230 , that is, the lower convex portion of the second plate 220 is accommodated in the avoidance portion 5102 of the first reinforcement 510 .

[0039] In addition, since the first reinforcement 510 is located in the edge area of ​​the cold plate 200, and the edge area of ​​the cold plate 200 is fixed to the side beam 120 of the box body by screws 130, an avoidance hole 511 is also provided on the first reinforcement 510 for avoiding the screws 130 so that the first reinforcement 510 can be bonded to the edge area of ​​the cold plate 200.

[0040] Continue to see Figure 1 、 Figure 2 and Figure 4The battery pack further includes a second reinforcement member 520, which is also disposed below the cold plate 200 and located in the middle region of the cold plate 200. Furthermore, the second reinforcement member 520 is bonded to the cold plate 200. Exemplarily, the second reinforcement member 520 is bonded to the cold plate 200 using a structural adhesive to ensure bonding strength.

[0041] In this embodiment, the second reinforcement member 520 is strip-shaped and extends along the length of the cold plate. The second reinforcement member 520 is positioned along the cold plate's axis of symmetry. Because the cold plate is a large plate-like structure, attaching the second reinforcement member 520 to its central region significantly increases the cold plate's bending and torsional stiffness, further minimizing deformation under vibration and impact conditions and reducing the risk of debonding between the cold plate and the battery cells.

[0042] The length of the second reinforcement is L2, the width of the second reinforcement is W2, the range of L2 / L is [0.90, 1.10], and the range of W2 / W is [0.02, 0.05]. For example, L2 / L is 1 and W2 / W is 0.03.

[0043] In a specific embodiment, the length L2 of the second reinforcement is 1700 mm, and the width W2 of the second reinforcement is 40 mm.

[0044] In this embodiment, the second reinforcement member 520 is made of metal, such as aluminum, and is manufactured through an extrusion process. Furthermore, the second reinforcement member 520 is provided with a cavity. The use of aluminum and the cavity also help reduce the overall weight of the battery pack.

[0045] Continue to see Figure 1 In this embodiment, the end of the first reinforcement 510 is also fixed to the first frame 110 of the box through fasteners; the end of the second reinforcement 520 is also fixed to the first frame 110 of the box through fasteners.

[0046] Specifically, as described above, the first frame 110 is a die-cast part, and threaded holes can be die-cast and formed on the die-cast part, so that the first reinforcement 510 and the second reinforcement 520 can be fixed to the first frame 110 by bolts or other means. In this way, under vibration and impact conditions, the force exerted on the cold plate 200 can be transmitted to the box body through the first reinforcement 510 and the second reinforcement 520, especially to the die-cast parts at the ends of the box body, thereby further improving the load-bearing and impact resistance of the cold plate.

[0047] Specifically, as an example, see Figure 5 , shows a schematic diagram of the end portion of the second reinforcement 520 being fixedly connected to the first frame 110. Threaded holes 111 are die-cast and formed on the die-cast part of the first frame 110, so that the second reinforcement 520 is fixed to the first frame 110 by bolts.

[0048] Continue to see Figures 1 to 5 The battery pack also includes a buffer 600, which is fixed to the lower surface of the cold plate 200 and avoids the first reinforcement 510 and the second reinforcement 520. In other words, on the lower surface of the cold plate 200, in addition to the areas where the first reinforcement 510 and the second reinforcement 520 are adhered, the buffer 600 can be adhered to these areas. In addition, the upper surface of the buffer 600 has a shape that follows the lower surface of the cold plate 200 to improve the fit between the two and reduce the Z-direction size of the battery pack. Exemplarily, the buffer 600 is foam or a honeycomb panel. Thereby, the buffer further improves the impact resistance of the bottom of the battery pack and improves the safety of the battery pack.

[0049] Finally, the present application also provides an electric device, which includes the above-mentioned battery pack. For example, the electric device is a vehicle.

[0050] It should be noted that although the present invention is disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: Box; a cold plate fixed to the box; A battery cell, the battery cell being disposed above the cold plate and bonded to the cold plate; The first reinforcement member is disposed below the cold plate and located at edge areas on both sides of the cold plate, and the first reinforcement member is bonded to the cold plate.

2. The battery pack according to claim 1, wherein: The first reinforcement is strip-shaped and extends along the length direction of the cold plate; The length of the first reinforcement is L1, the width of the first reinforcement is W1, the length of the cold plate is L, and the width of the cold plate is W; The range of L1 / L is [0.8, 1.0]; and / or the range of W1 / W is [0.05, 0.10].

3. The battery pack according to claim 1, wherein: The cold plate includes a first plate and a second plate arranged opposite to each other, and a flow channel is stamped on the second plate; The first reinforcement member includes an avoidance portion, and the avoidance portion is used to avoid the flow channel.

4. The battery pack according to claim 1, wherein: The first reinforcement is made of metal and is manufactured through an extrusion process.

5. The battery pack according to claim 4, characterized in that: The first reinforcement is provided with a cavity.

6. The battery pack according to claim 1, wherein: The first reinforcement is also fixed to the box body by fasteners.

7. The battery pack according to claim 6, characterized in that: The box body includes a first frame located at an end of the box body, and the first frame is made by a die-casting process; An end portion of the first reinforcement is fixed to the first frame by the fastener.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The battery pack further includes a second reinforcement member, which is disposed below the cold plate and located in a middle area of ​​the cold plate, and is bonded to the cold plate.

9. The battery pack according to claim 8, characterized in that: The second reinforcement is also fixed to the box body by fasteners.

10. The battery pack according to claim 1, wherein: The battery pack further includes a buffer component, which is adhered to the lower surface of the cold plate and avoids the first reinforcement component.

11. An electrical device, characterized in that: The electric device includes a battery pack according to any one of claims 1 to 10.

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