A power battery and a vehicle

Abstract

This application provides a power battery and a vehicle. The power battery includes a cell, a cover, and a housing, with a receiving space between the cover and the housing, where the cell is housed. An internal reinforcing beam is also provided within the housing, comprising a first beam and a second beam arranged in a cross shape. A reinforcing section is provided on the top wall of the first beam, comprising a main body and clearance sections at both ends of the main body, with a predetermined angle between the top wall of the clearance section and the top wall of the main body. By providing an internal reinforcing beam within the housing, a multi-path load transfer mechanism can be formed, significantly improving the bending and torsional resistance of the housing. The first and second beams can form a continuous cross structure, eliminating stress blind spots and improving the housing's protection of the cell. When the housing is subjected to external impact, the impact force can be transmitted through the internal reinforcing beam, preventing damage to the cell and further enhancing the protection of the cell, thereby significantly improving the safety of the power battery.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, specifically to a power battery and a vehicle. Background Technology

[0002] With the rapid development of the electric vehicle industry, power batteries, with their advantages of high voltage, high energy, and small size, are widely used in electric vehicles. Therefore, power battery technology has become a key factor restricting the performance and safety of electric vehicles. When the power battery casing is subjected to external impact, the limited load transmission paths result in lower bending and torsional resistance, making the battery prone to damage. This damage can then lead to internal cell structure failure, severely affecting the safety of the power battery in use. Utility Model Content

[0003] This application provides a power battery and a vehicle to address the technical problem of low safety in the use of power batteries in the prior art.

[0004] In a first aspect, embodiments of this application provide a power battery, the power battery including a cell, a cover and a housing, with an accommodating space between the cover and the housing, and the cell housed within the accommodating space; wherein, an inner reinforcing beam is further provided inside the housing, the inner reinforcing beam including a first beam and a second beam in a cross shape; a reinforcing part is provided on the top wall of the first beam, the reinforcing part including a main body and clearance parts located at both ends of the main body, the top wall of the clearance part and the top wall of the main body having a preset angle α.

[0005] In this embodiment, by incorporating internal reinforcing beams within the housing, a multi-path load transfer mechanism is established, significantly improving the housing's bending and torsional resistance. Specifically, the internal reinforcing beams may include a first beam and a second beam in a cross-shaped structure. The two long beams form a continuous cross structure to enhance the structural strength of the housing, eliminate stress blind spots, and improve the housing's protection of the battery cells. Simultaneously, when the housing is subjected to external impact, the impact force can be transferred through the internal reinforcing beams, preventing damage to the battery cells and further enhancing the protection of the cells, thereby significantly improving the safety of the power battery in use.

[0006] Meanwhile, a reinforcing section can also be provided on the top wall of the first beam. This reinforcing section not only enhances the structural strength of the inner reinforcing beam but also improves the placement stability of the battery cells. Specifically, the reinforcing section can also include a main body and clearance sections located at both ends of the main body. The top wall of the clearance section and the top wall of the main body have a preset angle α, ensuring that the height of the clearance section is less than the height of the main body. This facilitates the assembly of the casing and cover in subsequent process steps, avoids interference with other mounting components (such as wiring harnesses and brackets), and facilitates the assembly of the power battery.

[0007] In one specific embodiment, the height of the avoidance portion gradually decreases along the direction from the main body to the avoidance portion; along the height direction of the power battery, the height of the two ends of the avoidance portions that are relatively far apart is lower than the height of the housing.

[0008] In one specific embodiment, the top wall of the avoidance part is provided with wrinkle-absorbing ribs.

[0009] In one specific embodiment, along the height direction of the power battery, the first beam is located above the second beam; the first beam is provided with a groove, and the second beam engages with the groove so that the first beam and the second beam form a cross structure.

[0010] In one specific embodiment, the groove is located at the middle position of the first beam.

[0011] In one specific embodiment, the groove extends through the first beam and at least a portion of the main body.

[0012] In one specific embodiment, the preset angle α satisfies 8°≤α≤10°.

[0013] In one specific embodiment, the thickness H1 of the reinforcing part satisfies 2mm≤H1≤4mm.

[0014] In one specific embodiment, the housing is further provided with a frame beam, the frame beam including two first frame beams extending along the length direction of the power battery and two second frame beams extending along the width direction of the power battery; the two first frame beams and the two second frame beams form a U-shaped structure; the ends of the first beams are fixedly connected to the two first frame beams, and the ends of the second beams are fixedly connected to the two second frame beams to form a partition; the battery cell is located inside the partition.

[0015] Secondly, embodiments of this application provide a vehicle, which includes the power battery.

[0016] In this embodiment, when the aforementioned power battery is applied to a vehicle, it can significantly improve the vehicle's safety. Specifically, when the vehicle is subjected to an external impact, and the impact force is transmitted to the internal power battery, the battery casing can quickly transfer the impact force to other components through multiple load transfer paths formed by the internal reinforcing beams within the casing. This improves the casing's resistance to bending and torsion, preventing damage to the casing and enhancing its protection of the battery cells, thereby significantly improving the vehicle's safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the power battery provided in this application in a specific embodiment;

[0019] Figure 2 for Figure 1 Structural schematic diagram of the middle box and internal reinforcing beam;

[0020] Figure 3 for Figure 2 Structural schematic diagram of the inner reinforcing beam and the frame beam;

[0021] Figure 4 for Figure 3 Structural diagram of the first beam in the middle;

[0022] Figure 5 for Figure 4 Top view.

[0023] Figure label:

[0024] 1-Power battery;

[0025] 11-Battery cell;

[0026] 12- Enclosure;

[0027] 13 - Internally reinforced beam;

[0028] 131 - First beam;

[0029] 132 - Second beam;

[0030] 133-Reinforced Department

[0031] 133a - Main body;

[0032] 133b - Avoidance section;

[0033] 134-suction of wrinkles;

[0034] 135-groove;

[0035] 14-Side frame beam;

[0036] 141 - First border beam;

[0037] 142 - Second border beam. Detailed Implementation

[0038] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0040] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0041] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0042] Electric vehicles (EVs) are vehicles powered by onboard electricity, using electric motors to drive their wheels. They offer good economic efficiency and relatively low environmental pollution, thus their development prospects are widely considered promising. The power battery is the primary power source for EVs. A power battery typically consists of a casing, a housing, and battery cells. The housing provides load-bearing and protection for the cells. However, due to the limited load transmission paths within the battery housing, its bending and torsional resistance is relatively low. When the battery is subjected to external impact, the housing cannot effectively transmit the force, easily leading to damage to the casing and consequently, damage to the internal cell structure. This severely impacts the safety of both the power battery and the vehicle.

[0043] To solve the above technical problems, such as Figures 1 to 4 As shown, this application embodiment provides a power battery 1 and a vehicle containing the power battery 1. The power battery 1 may include a cell 11, a cover, and a housing 12, with a receiving space between the cover and the housing 12, and the cell 11 is housed within the receiving space. The housing 12 may also contain an inner reinforcing beam 13, which includes a first beam 131 and a second beam 132 arranged in a cross shape. A reinforcing portion 133 may be provided on the top wall of the first beam 131, comprising a main body 133a and clearance portions 133b located at both ends of the main body 133a, with a predetermined angle α between the top wall of the clearance portion 133b and the top wall of the main body 133a.

[0044] In this embodiment, by setting an internal reinforcing beam 13 inside the housing 12, multiple load transfer paths can be formed, significantly improving the bending and torsional resistance of the housing 12. Specifically, the internal reinforcing beam 13 may include a first beam 131 and a second beam 132 in a cross-shaped structure. The two long beams can form a continuous cross structure to improve the structural strength of the housing 15, eliminate stress blind spots, and enhance the protection effect of the housing 12 on the battery cell 11. At the same time, when the housing 12 is subjected to external impact, the impact force borne by the housing 12 can be transferred through the internal reinforcing beam 13 to avoid damage to the battery cell 11, further improving the protection effect on the battery cell 11, thereby significantly improving the safety of the power battery 1 in use.

[0045] Meanwhile, a reinforcing part 133 can also be provided on the top wall of the first beam 131. The reinforcing part 133 can improve the structural strength of the inner reinforcing beam 13 and also improve the stability of the battery cell 11 after placement. Specifically, the reinforcing part 133 can also include a main body 133a and clearance parts 133b located at both ends of the main body 133a. The top wall of the clearance part 133b and the top wall of the main body 133a have a preset angle α, which makes the height of the clearance part 133b less than the height of the main body 133a. This facilitates the assembly of the housing 12 and the cover in subsequent process steps, avoids interference with other installation components (such as wiring harnesses, brackets, etc.), and facilitates the assembly of the power battery 1.

[0046] Among them, the inner reinforcing beam 13 can be made of high-strength steel. While ensuring that the strength of the inner reinforcing beam 13 meets the requirements of the power battery 1, it can also reduce the weight of the inner reinforcing beam 13 to meet the weight reduction requirements of the vehicle, thereby improving the portability of the power battery.

[0047] In one specific embodiment, such as Figures 1 to 4 As shown, when the aforementioned power battery 1 is applied to a vehicle, it can significantly improve the vehicle's safety. Specifically, when the vehicle is subjected to an external impact and the impact force is transmitted to the internal power battery 1, the battery box 12 can quickly transmit the impact force to other components through multiple load transmission paths formed by the internal reinforcing beams 13 within the box 12. This improves the bending and torsional resistance of the box 12, prevents damage to the box 12, enhances the protection effect of the box 12 on the battery cells 11, and thus significantly improves the vehicle's safety.

[0048] In one specific embodiment, such as Figure 3 and Figure 4 As shown, along the direction from the main body 133a to the clearance part 133b, the height of the clearance part 133b can gradually decrease. Furthermore, along the height direction of the power battery 1, the height of the two clearance parts 133b at the relatively far ends is lower than the height of the housing 12.

[0049] In this embodiment, the ends of the two clearance portions 133b that are relatively far apart are close to the connection between the cover and the housing 12. Therefore, along the height direction of the power battery 1, the height of the ends of the two clearance portions 133b that are relatively far apart is lower than the height of the housing 12, which can further enable the clearance portions 133b to make clearance when the housing 12 and the cover are assembled, thereby significantly improving the convenience of assembling the housing 12 and the cover.

[0050] At the same time, along the direction from the main body 133a to the avoidance part 133b, the height of the avoidance part 133b is gradually reduced, reducing the structural features of the avoidance part 133b, facilitating the process forming of the avoidance part 133b, and enabling the internal force distribution pattern of the avoidance part 133b to improve the structural strength of the avoidance part 133b, so that it can meet the strength requirements of the reinforcing part 133.

[0051] In one specific embodiment, such as Figure 4 and Figure 5 As shown, the top wall of the clearance part 133b may be provided with wrinkle-absorbing ribs 134.

[0052] In this embodiment, because the clearance portion 133b has a height variation, uneven material flow is prone to occur during the stamping process. This leads to disordered internal stress in the area where the clearance portion 133b is located, which in turn easily causes small-area wrinkling, material accumulation, and other defects on the surface of the clearance portion 133b after molding. To solve this technical problem, wrinkle-absorbing ribs 134 can also be provided on the top wall of the clearance portion 133b. By providing wrinkle-absorbing ribs 134, a flow space can be provided for the material in the wrinkle-prone areas of the clearance portion 133b to absorb excess material, prevent excess material accumulation at this location, optimize the ductility of the material, and avoid wrinkling, material accumulation, and other defects on the top wall of the clearance portion 133b.

[0053] In addition, the wrinkle-absorbing ribs 134 provided on the top wall of the avoidance part 133b can guide the deformation flow when the avoidance part 133b is welded to other components, thereby improving the stability of the welding process and the supporting rigidity of the avoidance part 133b, so as to further improve the structural strength of the avoidance part 133b.

[0054] In one specific embodiment, such as Figure 3 and Figure 4 As shown, along the height direction of the power battery 1, the first beam 131 can be located above the second beam 132, and the first beam 131 is provided with a groove 135. The second beam 132 is engaged with the groove 135 so that the first beam 131 and the second beam 132 form a cross structure.

[0055] In this embodiment, along the height direction of the power battery 1, the first beam 131 is positioned above the second beam 132, thereby enabling the first beam 131 and the second beam 132 to form a cross-shaped structure, thus creating multiple load transmission paths between the inner reinforcing beam 13 and the housing 12. Furthermore, a groove 135 is provided on the first beam 131, allowing the second beam 132 to engage with the groove 135, ensuring the integrity of the second beam 132 and further enhancing its integrity and stability when transmitting impact forces.

[0056] Meanwhile, by setting a groove 135 on the first beam 131, the installation of the second beam 132 can also be positioned and guided, which facilitates the assembly of the first beam 131 and the second beam 132.

[0057] In one specific embodiment, such as Figures 1 to 4 As shown, the groove 135 can be located in the middle of the first beam 131.

[0058] In this embodiment, the groove 135 is located in the middle of the first beam 131, so that the cross structure formed by the first beam 131 and the second beam 132 can evenly divide the box 12, so that the battery cells 11 located in the partition are symmetrically arranged, which facilitates the installation of the battery cells 11 and also improves the symmetry and stability of the overall structure of the power battery 1.

[0059] In one specific embodiment, such as Figure 3 and Figure 4 As shown, the groove 135 can penetrate the first beam 131 and at least part of the main body 133a.

[0060] In this embodiment, the groove 135 penetrates the first beam 131 and at least part of the main body 133a, thereby increasing the contact area between the second beam 155 and the first beam 131 when the second beam 132 engages with the groove 135. This improves the connection reliability between the first beam 131 and the second beam 132 and prevents the first beam 131 and the second beam 132 from falling off during the use of the inner reinforcing beam 13.

[0061] In the above embodiments, such as Figure 3 and Figure 4 As shown, the preset angle α between the top wall of the avoidance part 133b and the top wall of the main body part 133a can satisfy 8°≤a≤10°.

[0062] In this embodiment, the preset angle α between the top wall of the avoidance part 133b and the top wall of the main body part 133a can satisfy 8°≤a≤10°, for example, the preset angle α can be 8°, 9°, 10°, etc. Making the preset angle α satisfy 8°≤a≤10° allows the height of the avoidance part 133b to gradually decrease, so that the height of the two avoidance parts 133b at the ends furthest from each other is lower than the height of the housing 12. This facilitates the assembly of the housing 12 and the cover, and also facilitates the installation of other components in the power battery 1, preventing interference between the avoidance part 133b and other components. Simultaneously, it also prevents excessive height changes in the avoidance part 133b, which could reduce its structural strength, and avoids overly complex manufacturing processes that would make it difficult to form.

[0063] In other embodiments, the preset angle α can also be other values. In this embodiment, the specific value of the preset angle α is not limited and can be adjusted according to the actual situation.

[0064] In the above embodiments, such as Figure 4 and Figure 5 As shown, the thickness H1 of the reinforcing part 133 can satisfy 2mm≤H1≤4mm.

[0065] In this embodiment, the thickness H1 of the reinforcing part 133 can satisfy 2mm≤H1≤4mm. For example, the thickness H1 of the reinforcing part 133 can be 2mm, 3mm, 4mm, etc. By ensuring that the thickness H1 of the reinforcing part 133 satisfies 2mm≤H1≤4mm, the structural strength of the reinforcing part 133 can be guaranteed, and the reinforcing part 133 can meet the usage requirements of the power battery 1. At the same time, it can also prevent the thickness of the reinforcing part 133 from being too large, so that it occupies the arrangement space of the cell 11, and avoid the reinforcing part 133 from interfering with the cell 11 or other mounting components in the power battery 1, thus affecting the assembly of the power battery 1.

[0066] In other embodiments, the thickness H1 of the reinforcing part 133 may also be other values. In this application embodiment, the specific value of the thickness H1 of the reinforcing part 133 is not limited and can be adjusted according to the actual situation.

[0067] In the above embodiments, such as Figure 2 and Figure 3 As shown, the housing 12 may also be provided with side frame beams 14, which include two first side frame beams 141 extending along the length direction of the power battery and two second side frame beams 142 extending along the width direction of the power battery. The two first side frame beams 141 and the two second side frame beams 142 form a U-shaped structure. The ends of the first beams 131 are fixedly connected to the two first side frame beams 141, and the ends of the second beams 132 are fixedly connected to the two second side frame beams 142 to form a partition. The battery cell 11 is located within the partition formed by the inner reinforcing beams 13 and the side frame beams 14.

[0068] In this embodiment, the housing 12 can also be provided with side beams 14. The side beams 14 can include two first side beams 141 extending along the length direction of the power battery and two second side beams 142 extending along the width direction of the power battery. The two first side beams 141 and the two second side beams 142 can form a U-shaped structure. When the inner reinforcing beam 13 is fixedly connected to the side beams 14, the inner reinforcing beam 13 and the side beams 14, which have a cross-shaped structure, can form a grid-shaped integrated load-bearing structure. The battery cell 11 can be housed in the partition formed by the inner reinforcing beam 13 and the side beams 14, thereby improving the installation stability of the battery cell 11. The specific connection method is as follows: the ends of the first beams 131 are fixedly connected to the two first side beams 141 respectively, and the ends of the second beams 132 are fixedly connected to the two second side beams 142 respectively. Furthermore, when the power battery 1 is subjected to external impact, the inner reinforcing beam 13 and the frame beam 14 can serve as multiple load transmission paths, allowing the impact force to be transmitted to other components through the inner reinforcing beam 13 and the frame beam 14, thereby reducing the impact force on the battery cell 11 and improving the safety of the power battery 1.

[0069] In the above embodiments, the inner reinforcing beam 13, the side frame beam 14, and the housing 12 can be connected by welding to improve the reliability of the connection and prevent detachment during the use of the power battery. Specifically, the connection between the first beam 131 and the second beam 132 can be welded using a carbon dioxide gas shielded welding process, as can the connection between the inner reinforcing beam 13 and the side frame beam 14. The inner reinforcing beam and the side frame beam 14 can be spot welded to the bottom wall of the housing 12. This ensures the reliability of the connection between the components and allows for adjustments to the welding process based on different locations, reducing the difficulty of welding operations for operators.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power battery, characterized in that, The power battery includes a cell, a cover, and a housing, with an accommodating space between the cover and the housing, and the cell is housed within the accommodating space; The box body is also provided with an internal reinforcing beam, which includes a first beam and a second beam that are arranged in a cross shape; a reinforcing part is provided on the top wall of the first beam, the reinforcing part includes a main body and clearance parts located at both ends of the main body, and the top wall of the clearance part and the top wall of the main body have a preset angle α.

2. The power battery according to claim 1, characterized in that, Along the direction from the main body to the clearance portion, the height of the clearance portion gradually decreases; Along the height direction of the power battery, the height of the two relatively far ends of the avoidance parts is lower than the height of the housing.

3. The power battery according to claim 2, characterized in that, The top wall of the avoidance section is provided with wrinkle-absorbing ribs.

4. The power battery according to claim 1, characterized in that, Along the height direction of the power battery, the first beam is located above the second beam; The first beam is provided with a groove, and the second beam engages with the groove so that the first beam and the second beam form a cross structure.

5. The power battery according to claim 4, characterized in that, The groove is located in the middle of the first beam.

6. The power battery according to claim 5, characterized in that, The groove extends through the first beam and at least a portion of the main body.

7. The power battery according to any one of claims 1-6, characterized in that, The preset angle α satisfies 8°≤α≤10°.

8. The power battery according to any one of claims 1-6, characterized in that, The thickness H1 of the reinforcing part satisfies 2mm≤H1≤4mm.

9. The power battery according to any one of claims 1-6, characterized in that, The housing is also provided with side beams, which include two first side beams extending along the length direction of the power battery and two second side beams extending along the width direction of the power battery; the two first side beams and the two second side beams form a U-shaped structure. The end of the first beam is fixedly connected to two first side frame beams, and the end of the second beam is fixedly connected to two second side frame beams to form a partition; the battery cell is located within the partition.

10. A vehicle, characterized in that, The vehicle includes the power battery as described in any one of claims 1-9.

Images