Battery case and battery

Abstract

This application provides a battery housing and a battery. The battery housing includes: a side beam with an inner cavity, including an inner side wall and an outer side wall disposed opposite to each other, and a bottom wall connected between the inner side wall and the outer side wall. The side beam also includes reinforcing ribs disposed in the inner cavity and connected between the inner side wall and the outer side wall, with the reinforcing ribs gradually inclined towards the bottom wall in a direction from the outside to the inside; and a bottom plate connected to the bottom wall. By providing reinforcing ribs in the inner cavity of the side beam, the force acting on the side beam can be transmitted along the reinforcing ribs. At the same time, by connecting the bottom plate to the bottom wall of the side beam and making the reinforcing ribs gradually inclined towards the bottom wall, the force transmitted by the reinforcing ribs can be transmitted to the bottom plate. The bottom plate then transmits the force to the side beam on the other side, which can reduce the deformation of the side beam, reduce the possibility of cell deformation in the battery housing, and help improve the reliability of the battery housing provided by this application.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery housing and a battery. Background Technology

[0002] In related technologies, vehicles may deform during a collision. For new energy vehicles, this deformation can compress the battery pack, which contains multiple battery cells. Therefore, deformation of the battery pack can cause the cells within to deform under stress, potentially leading to fire or explosion risks. Thus, it is necessary to reduce the likelihood of battery pack deformation. Currently, a common method is to increase the gap between the side beams and the battery cells. However, this results in a larger space occupied by the battery pack, making layout more difficult. It also increases the weight of the battery pack. Utility Model Content

[0003] The embodiments of this application provide a battery housing and a battery, which can improve the technical problem of battery housing being prone to deformation.

[0004] In a first aspect, embodiments of this application provide a battery housing, comprising:

[0005] The side beam has an inner cavity, including an inner side wall and an outer side wall arranged opposite to each other, and a bottom wall connecting the inner side wall and the outer side wall. The side beam also includes a reinforcing rib, which is disposed in the inner cavity and connected between the inner side wall and the outer side wall. Along the direction from the outside to the inside, the reinforcing rib gradually slopes towards the bottom wall.

[0006] The base plate is connected to the bottom wall.

[0007] By incorporating reinforcing ribs within the inner cavity of the side beam, the force acting on the side beam can be transmitted along these ribs. Simultaneously, by connecting the base plate to the bottom wall of the side beam and gradually inclining the reinforcing ribs towards the bottom wall, the force transmitted through the ribs can be transferred to the base plate. The base plate then transmits the force to the other side of the side beam, reducing the degree of deformation of the side beam and lowering the possibility of cell deformation within the battery box, thus contributing to improved reliability of the battery box provided in this application.

[0008] In some embodiments, the inner sidewall has an inclined section, one end of which is connected to a reinforcing rib and the other end is connected to the bottom wall. The inclined section gradually slopes towards the bottom wall in a direction from the outside to the inside.

[0009] This allows the force acting on the side beam to be directly transmitted to the bottom wall through the reinforcing ribs and inclined sections, and then to the base plate connected to the bottom wall. The base plate then transmits the force to the side beam on the other side, which helps to further reduce the deformation of the side beam and reduce the possibility of cell deformation inside the battery box.

[0010] In some embodiments, the angle between the reinforcing rib and the horizontal plane is 0 to 75°; and / or, the angle between the inclined section and the vertical plane is 0 to 75°.

[0011] This not only meets the design requirements of the reinforcing ribs, but also transfers the force acting on the outer wall of the side beam to the base plate through the reinforcing ribs, thereby reducing the probability of battery box deformation.

[0012] In some embodiments, the battery housing further includes a protrusion extending outward from the outer side wall, and a connecting rib that is inclined and connects the protrusion to the bottom wall.

[0013] The force acting on the protrusion can be directly transmitted to the bottom wall through the connecting rib, and then transmitted to the side beam on the other side through the bottom plate connected to the bottom wall. This allows the side beam on the other side to share the force acting on the battery box, which helps to further reduce the deformation of the side beam and reduce the possibility of cell deformation inside the battery box.

[0014] In some embodiments, the protrusion and the side beam have a first connection point, and the distance h1 between the end of the reinforcing rib near the protrusion and the bottom wall is less than or equal to the distance h2 between the first connection point and the bottom wall.

[0015] This allows the force acting on the protrusion to be transmitted to the base plate through the reinforcing ribs, thereby reducing the possibility of battery box deformation.

[0016] In some embodiments, the protrusion and the side beam also have a second connection point, which is closer to the bottom wall than the first connection point. The distance h1 between the end of the reinforcing rib near the protrusion and the bottom wall is equal to the distance h3 between the second connection point and the bottom wall.

[0017] This allows the force acting on the protrusion to be directly transmitted to the inner wall of the side beam through the reinforcing ribs, which helps to shorten the force transmission path and allow more force to act on the base plate. Since the base plate usually has a large structural strength, it can reduce the possibility of deformation of the battery box side beam.

[0018] In some embodiments, the wall thickness of the reinforcing rib is 1.5 to 4.0 mm; and / or, the wall thickness of the inclined section is 1.5 to 4.0 mm.

[0019] This ensures the structural strength of the edge beams while also reducing their weight.

[0020] In some embodiments, the base plate includes a liquid cooling plate and a bottom protective plate. A stepped portion is provided on the side of the bottom wall away from the inner cavity. The stepped portion includes a first stepped surface and a second stepped surface. The first stepped surface is closer to the inner wall than the second stepped surface. The end of the liquid cooling plate is connected to the first stepped surface, and the end of the bottom protective plate is connected to the second stepped surface. The bottom protective plate is located outside the liquid cooling plate.

[0021] Two force transmission paths can be formed by the liquid cooling plate and the bottom protective plate, transferring the force to the other side beam and reducing the possibility of side beam deformation. At the same time, the liquid cooling plate and the bottom protective plate are connected to different surfaces of the bottom wall, which can avoid the force transmitted to the side beam being too concentrated, and help to further reduce the probability of side beam deformation.

[0022] In some embodiments, the end of the inclined section away from the reinforcing rib is connected to the first step surface.

[0023] This ensures that both the liquid cooling plate and the bottom protective plate are connected to the bottom wall, and also allows the bottom protective plate to be located on the outside of the liquid cooling plate, thus protecting the liquid cooling plate and improving the reliability of the battery box provided in this application.

[0024] In some embodiments, the height difference between the first step surface and the second step surface in the height direction of the side beam is 6 to 10 mm.

[0025] To avoid the transfer of force between the two sides, more force is transferred to the other side of the edge beam, reducing the possibility of deformation of the edge beam.

[0026] In some embodiments, the width of the first step surface in the width direction of the edge beam is 15-17 mm; and / or, the width of the second step surface is greater than or equal to 15 mm.

[0027] It can satisfy the connection strength between the first step surface and the liquid cooling plate, and also ensure the connection relationship between the second step surface and the bottom protective plate.

[0028] In some embodiments, the liquid cooling plate is connected to the first stepped surface by friction stir welding; and / or, the bottom protective plate is connected to the second stepped surface by riveting and bolting.

[0029] While ensuring that the force acting on the side beam can be transmitted to the other side beam, it can also reduce the size of the battery box in the height direction of the side beam, which facilitates the arrangement of the battery box provided in this application on the whole vehicle.

[0030] Secondly, embodiments of this application also provide a battery, including the battery housing as described in the first aspect.

[0031] The beneficial effects of the embodiments of this application are as follows:

[0032] In the embodiments of this application, by providing reinforcing ribs within the inner cavity of the side beam, the force acting on the side beam can be transmitted along the reinforcing ribs. Simultaneously, by connecting the base plate to the bottom wall of the side beam and gradually tilting the reinforcing ribs towards the bottom wall, the force transmitted through the reinforcing ribs can be transferred to the base plate. The base plate then transmits the force to the side beam on the other side, reducing the degree of deformation of the side beam and lowering the possibility of cell deformation within the battery box, thus contributing to improved reliability of the battery box provided in this application. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a cross-sectional view of a battery box provided in an embodiment of this application;

[0035] Figure 2 yes Figure 1 An enlarged schematic diagram of part A of the provided battery housing structure;

[0036] Figure 3 yes Figure 1 Provide a sectional view of the side beams of the battery box;

[0037] Figure 4 yes Figure 1 An enlarged schematic diagram of the structure of part B of the provided battery box;

[0038] Figure 5 yes Figure 1 A schematic diagram of the force transmission path of the provided battery box.

[0039] Figure label:

[0040] 10. Side beam; 11. Inner cavity; 12. Inner side wall; 121. Inclined section; 13. Outer side wall; 14. Bottom wall; 141. First step surface; 142. Second step surface; 15. Reinforcing rib; 16. Protrusion; 161. First connection; 162. Second connection; 17. Connecting rib;

[0041] 20. Base plate; 21. Liquid cooling plate; 22. Bottom protective plate. Detailed Implementation

[0042] 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 a part of the embodiments of this application, and not all of the 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. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] This application provides a battery including a battery housing 100. The battery housing 100 has high structural strength and low deformation probability, thereby reducing the possibility of deformation of the battery cells disposed within the battery housing 100.

[0044] Please see Figures 1 to 5 , Figure 1 This is a cross-sectional view of a battery case provided in an embodiment of this application. Figure 2 yes Figure 1 An enlarged schematic diagram of part A of the provided battery housing structure. Figure 3 yes Figure 1 Provide a sectional view of the side beams of the battery compartment. Figure 4 yes Figure 1 An enlarged schematic diagram of section B of the provided battery housing structure. Figure 5 yes Figure 1 A schematic diagram of the force transmission path of the provided battery box. This application provides a battery box 100, which includes: a side beam 10 having an inner cavity 11, including an inner side wall 12 and an outer side wall 13 disposed opposite to each other, and a bottom wall 14 connected between the inner side wall 12 and the outer side wall 13. The side beam 10 also includes a reinforcing rib 15 disposed in the inner cavity 11 and connected between the inner side wall 12 and the outer side wall 13. Along the direction from the outside to the inside, the reinforcing rib 15 gradually slopes towards the bottom wall 14; and a bottom plate 20 connected to the bottom wall 14.

[0045] In this embodiment, by providing reinforcing ribs 15 within the inner cavity 11 of the side beam 10, the force acting on the side beam 10 can be transmitted along the reinforcing ribs 15. Simultaneously, by connecting the base plate 20 to the bottom wall 14 of the side beam 10, and by gradually tilting the reinforcing ribs 15 towards the bottom wall 14, the force transmitted through the reinforcing ribs 15 can be transmitted to the base plate 20. The base plate 20 then transmits the force to the other side of the side beam 10, reducing the degree of deformation of the side beam 10 and lowering the possibility of cell deformation within the battery box 100, thus contributing to improved reliability of the battery box 100 provided in this application.

[0046] Please continue reading. Figures 1 to 5 In some embodiments of this application, the inner sidewall 12 has an inclined section 121. One end of the inclined section 121 is connected to the reinforcing rib 15, and the other end is connected to the bottom wall 14. Along the direction from the outside to the inside, the inclined section 121 gradually tilts towards the bottom wall 14.

[0047] In this embodiment, by connecting one end of the inclined section 121 of the inner sidewall 12 to the reinforcing rib 15 and the other end to the bottom wall 14, the force acting on the side beam 10 can be directly transmitted to the bottom wall 14 through the reinforcing rib 15 and the inclined section 121, and then to the base plate 20 connected to the bottom wall 14. The base plate 20 then transmits the force to the side beam 10 on the other side, further reducing the deformation of the side beam 10 and lowering the possibility of cell deformation within the battery box 100. Furthermore, by gradually tilting the inclined section 121 towards the bottom wall 14 in the direction from the outside in, the area of ​​the bottom wall 14 increases, which helps to increase the contact area between the side beam 10 and the base plate 20. This optimizes the force distribution, distributing the force over a larger area of ​​the base plate 20, avoiding deformation of the base plate 20 due to excessive force concentration, and further reducing the possibility of deformation of the base plate 20, thus further lowering the possibility of cell deformation within the battery box 100.

[0048] In some embodiments of this application, the angle between the reinforcing rib 15 and the horizontal plane is 0 to 75°.

[0049] The side beams 10 of the battery box 100 typically have a certain width to improve structural strength and reduce the probability of deformation. Therefore, when designing the reinforcing ribs 15 installed in the inner cavity 11 of the side beams 10, it is necessary to consider the width of the side beams 10 to avoid the reinforcing ribs 15 failing to connect the inner side wall 12 and the outer side wall 13 due to an excessively large angle between the reinforcing ribs 15 and the horizontal plane, thus affecting the transmission of force. In this embodiment, the angle between the reinforcing ribs 15 and the horizontal plane is 0 to 75°, which satisfies the design requirements of the reinforcing ribs 15 and also allows the force acting on the outer side wall 13 of the side beams 10 to be transmitted to the base plate 20 through the reinforcing ribs 15, thereby reducing the probability of deformation of the battery box 100.

[0050] In some embodiments of this application, the angle between the inclined segment 121 and the vertical plane is 0 to 75°.

[0051] The inclined section 121 increases the area of ​​the bottom wall 14 of the side beam 10, thereby increasing the contact area between the side beam 10 and the bottom plate 20. This prevents deformation at the contact point between the bottom plate 20 and the side beam 10, further reducing the possibility of deformation of the battery box 100 and improving the reliability of the battery box 100 provided in this application.

[0052] Please continue reading. Figures 1 to 5 In some embodiments of this application, the battery box 100 further includes a protrusion 16 protruding outward from the outer side wall 13, and a connecting rib 17 inclined and connecting the protrusion 16 and the bottom wall 14.

[0053] By adopting this scheme, the force acting on the protrusion 16 can be directly transmitted to the bottom wall 14 through the connecting rib 17, and then the force can be transmitted to the side beam 10 on the other side through the bottom plate 20 connected to the bottom wall 14. Thus, the force acting on the battery box 100 can be shared by the side beam 10 on the other side, which helps to further reduce the deformation of the side beam 10 and reduce the possibility of cell deformation in the battery box 100.

[0054] Please continue reading. Figures 1 to 5 In some embodiments of this application, the protrusion 16 and the side beam 10 have a first connection 161, and the distance h1 between the end of the reinforcing rib 15 near the protrusion 16 and the bottom wall 14 is less than or equal to the distance h2 between the first connection 161 and the bottom wall 14.

[0055] refer to Figure 2 and Figure 3 The end of the reinforcing rib 15 near the protrusion 16 is located on one side of the cavity wall of the inner cavity 11, and the protrusion 16 is located on the other side of the cavity wall. When an external force is applied to the protrusion 16, the force is transmitted to the side beam 10 through the protrusion 16, and part of the force is transmitted to the reinforcing rib 15 through the cavity wall, and then transmitted to the bottom plate 20 along the reinforcing rib 15. In order to enable more force to be transmitted to the bottom plate 20 through the reinforcing rib 15, the bottom plate 20 with higher structural strength can be used to share the force on the battery box 100, thereby reducing the deformation of the battery box 100. In this embodiment, the distance h1 between the end of the reinforcing rib 15 near the protrusion 16 and the bottom wall 14 is less than or equal to the distance h2 between the first connection 161 and the bottom wall 14, which can ensure that the force applied to the protrusion 16 can be transmitted to the bottom plate 20 through the reinforcing rib 15, thereby reducing the possibility of deformation of the battery box 100.

[0056] Please continue reading. Figures 1 to 5 In some embodiments of this application, the protrusion 16 and the side beam 10 also have a second connection 162, which is closer to the bottom wall 14 than the first connection 161. The distance h1 between the end of the reinforcing rib 15 near the protrusion 16 and the bottom wall 14 is equal to the distance h3 between the second connection 162 and the bottom wall 14. In this way, the force acting on the protrusion 16 can be directly transmitted to the inner wall 12 of the side beam 10 through the reinforcing rib 15, which helps to shorten the force transmission path and allow more force to act on the base plate 20. Since the structural strength of the base plate 20 is usually large, the possibility of deformation of the side beam 10 of the battery box 100 can be reduced.

[0057] In some embodiments of this application, the wall thickness of the reinforcing rib 15 is 1.5–4.0 mm. This ensures the structural strength of the side beam 10 while also reducing its weight.

[0058] In some embodiments of this application, the wall thickness of the inclined section 121 is 1.5–4.0 mm. The technical effects are similar to or the same as those of the embodiments where the wall thickness of the reinforcing rib 15 is 1.5–4.0 mm, and will not be repeated here.

[0059] Please continue reading. Figures 1 to 5 In some embodiments of this application, the bottom plate 20 includes a liquid cooling plate 21 and a bottom protective plate 22. The bottom wall 14 is provided with a stepped portion on the side away from the inner cavity 11. The stepped portion includes a first stepped surface 141 and a second stepped surface 142. The first stepped surface 141 is closer to the inner sidewall 12 than the second stepped surface 142. The end of the liquid cooling plate 21 is connected to the first stepped surface 141, and the end of the bottom protective plate 22 is connected to the second stepped surface 142. The bottom protective plate 22 is located outside the liquid cooling plate 21.

[0060] In this embodiment, by providing a stepped portion on the bottom wall 14, and connecting the liquid cooling plate 21 and the bottom protective plate 22 via the first step surface 141 and the second step surface 142 of the stepped portion, two force transmission paths can be formed by the liquid cooling plate 21 and the bottom protective plate 22 to transmit the force to the other side beam 10, reducing the possibility of deformation of the side beam 10. Simultaneously, the liquid cooling plate 21 and the bottom protective plate 22 are connected to different surfaces of the bottom wall 14, which avoids excessive concentration of force transmitted to the side beam 10, further helping to reduce the probability of deformation of the side beam 10.

[0061] Please continue reading. Figures 1 to 5 In some embodiments of this application, the end of the inclined segment 121 facing away from the reinforcing rib 15 is connected to the first step surface 141. In this way, it can be ensured that both the liquid cooling plate 21 and the bottom protective plate 22 are connected to the bottom wall 14, and the bottom protective plate 22 can be located outside the liquid cooling plate 21. The bottom protective plate 22 protects the liquid cooling plate 21, which helps to improve the reliability of the battery box 100 provided by this application.

[0062] In some embodiments of this application, the height difference between the first step surface 141 and the second step surface 142 in the height direction of the side beam 10 is 6 to 10 mm.

[0063] Both the liquid cooling plate 21 and the bottom protective plate 22 have a certain thickness. The liquid cooling plate 21 and the bottom protective plate 22 are respectively connected to the first step surface 141 and the second step surface 142. In order to ensure that the force can be transmitted to the other side beam 10, the liquid cooling plate 21 and the bottom protective plate 22 need to be spaced apart in the height direction of the side beam 10 to avoid the force being transmitted between the two, so as to transmit more force to the other side beam 10 and reduce the possibility of deformation of the side beam 10.

[0064] In some embodiments of this application, the width of the first step surface 141 in the width direction of the side beam 10 is 15-17 mm.

[0065] This approach satisfies both the connection strength requirements between the first step surface 141 and the liquid cooling plate 21, and ensures the connection relationship between the second step surface 142 and the bottom protective plate 22.

[0066] In some embodiments of this application, the width of the second step surface 142 is greater than or equal to 15 mm. This ensures sufficient connection strength between the second step surface 142 and the bottom protective plate 22.

[0067] In some embodiments of this application, the liquid cooling plate 21 is connected to the first stepped surface 141 by friction stir welding. This ensures that the force acting on the side beam 10 can be transmitted to the other side beam 10, while also reducing the size of the battery box 100 in the height direction of the side beam 10, facilitating the arrangement of the battery box 100 provided in this application on the vehicle.

[0068] In some embodiments of this application, the bottom protective plate 22 is connected to the second stepped surface 142 by riveting and bolting. The technical effects are similar to or the same as those of the embodiment described above, in which the liquid cooling plate 21 is connected to the first stepped surface 141 by friction stir welding, and will not be described again here.

[0069] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery case (100) characterized by, include: The side beam (10) has an inner cavity (11), including an inner side wall (12) and an outer side wall (13) disposed opposite to each other, and a bottom wall (14) connected between the inner side wall (12) and the outer side wall (13). The side beam (10) also includes a reinforcing rib (15), which is disposed in the inner cavity (11) and connected between the inner side wall (12) and the outer side wall (13). Along the direction from the outside to the inside, the reinforcing rib (15) gradually tilts towards the bottom wall (14). The base plate (20) is connected to the bottom wall (14).

2. The battery pack (100) according to claim 1, characterized in that The inner sidewall (12) has an inclined section (121), one end of which is connected to the reinforcing rib (15) and the other end is connected to the bottom wall (14). Along the direction from the outside to the inside, the inclined section (121) gradually tilts towards the bottom wall (14).

3. The battery pack (100) of claim 2, wherein, The angle between the reinforcing rib (15) and the horizontal plane is 0 to 75°; and / or, the angle between the inclined section (121) and the vertical plane is 0 to 75°.

4. The battery pack (100) according to claim 2 or 3, characterized in that The battery box (100) also includes a protrusion (16) extending outward from the outer side wall (13), and a connecting rib (17) inclined and connecting the protrusion (16) and the bottom wall (14).

5. The battery housing (100) according to claim 4, characterized in that, The protrusion (16) has a first connection (161) with the side beam (10), and the distance h1 between the end of the reinforcing rib (15) near the protrusion (16) and the bottom wall (14) is less than or equal to the distance h2 between the first connection (161) and the bottom wall (14).

6. The battery housing (100) according to claim 5, characterized in that, The protrusion (16) and the side beam (10) also have a second connection (162), which is closer to the bottom wall (14) than the first connection (161). The distance h1 between the end of the reinforcing rib (15) near the protrusion (16) and the bottom wall (14) is equal to the distance h3 between the second connection (162) and the bottom wall (14).

7. The battery housing (100) according to claim 2 or 3, characterized in that, The wall thickness of the reinforcing rib (15) is 1.5 to 4.0 mm; and / or the wall thickness of the inclined section (121) is 1.5 to 4.0 mm.

8. The battery housing (100) according to claim 2 or 3, characterized in that, The base plate (20) includes a liquid cooling plate (21) and a bottom protective plate (22). The bottom wall (14) has a stepped portion on the side away from the inner cavity (11). The stepped portion includes a first stepped surface (141) and a second stepped surface (142). The first stepped surface (141) is closer to the inner sidewall (12) than the second stepped surface (142). The end of the liquid cooling plate (21) is connected to the first stepped surface (141), and the end of the bottom protective plate (22) is connected to the second stepped surface (142). The bottom protective plate (22) is located outside the liquid cooling plate (21).

9. The battery housing (100) according to claim 8, characterized in that, The inclined section (121) is connected to the first stepped surface (141) at one end away from the reinforcing rib (15).

10. The battery housing (100) according to claim 8, characterized in that, In the height direction of the side beam (10), the height difference between the first step surface (141) and the second step surface (142) is 6-10 mm.

11. The battery housing (100) according to claim 8, characterized in that, In the width direction of the side beam (10), the width of the first step surface (141) is 15-17 mm; and / or, the width of the second step surface (142) is greater than or equal to 15 mm.

12. The battery housing (100) according to claim 8, characterized in that, The liquid cooling plate (21) is connected to the first step surface (141) by friction stir welding; and / or, the bottom protective plate (22) is connected to the second step surface (142) by riveting and bolting.

13. A battery, characterized in that, Includes the battery housing (100) as described in any one of claims 1 to 12.

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