Battery case bottom supporting structure and battery pack

Abstract

The utility model provides a battery case bottom supporting structure and a battery pack, the battery case bottom supporting structure is arranged between a lower case body and a bottom guard plate and is used for protecting an electrical part above the bottom guard plate, the supporting structure comprises a reinforcing part which is arranged in a projection area of the electrical part on the bottom guard plate and is fixedly connected with the bottom guard plate, and the reinforcing part is used for supporting the electrical part on the bottom guard plate. Therefore, the projection area is enhanced. The battery pack has the effects of improving the shock resistance of the bottom of the battery pack and reducing the deformation of the bottom of the battery pack when being impacted so as to improve the sealing property of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery shell bottom support structure and a battery pack. Background Art

[0002] With the rise of revolutionary changes in the contemporary automobile industry, major automobile manufacturers have shifted their focus to new energy vehicles. Pure electric vehicles, as new energy vehicles, are increasingly favored by all sectors of society. In new energy electric vehicles, the battery pack is a key component that determines the endurance and safety of electric vehicles, and is a key constraint for electric vehicles to gain market recognition and customer trust.

[0003] Since vehicles may encounter various complex operating conditions during driving, in order to enhance the battery pack's ability to cope with various operating conditions, the structural strength of the battery pack needs to be improved. The structural design of the battery pack directly affects the overall safety of the battery pack.

[0004] In the related art, the battery pack includes a top cold plate, a battery module, electrical components, a lower box and a bottom guard plate. The battery module and electrical components are located in the lower box, the top cold plate is located above the lower box, and the bottom guard plate is connected to the bottom of the lower box. The battery pack structure has a top cold plate, and only a bottom guard plate is set at the bottom of the battery pack to achieve sealing, resulting in poor impact resistance of the battery pack. Utility Model Content

[0005] In view of this, the utility model aims to propose a battery shell bottom support structure and a battery pack, so as to improve the impact resistance of the bottom of the battery pack, reduce the deformation of the bottom of the battery pack when it is impacted, and improve the sealing of the battery pack.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery housing bottom support structure is arranged between the lower housing and the bottom guard plate, and is used to protect the electrical components above the bottom guard plate. The support structure includes:

[0008] The reinforcing member is arranged in the projection area of ​​the electrical member in the bottom guard plate and is fixedly connected to the bottom guard plate to reinforce the projection area.

[0009] Furthermore, the reinforcement member comprises:

[0010] A support frame is distributed in the same direction along the length direction of the projection area and connected to the bottom guard plate. The support frame is generally U-shaped and includes a flat first support plate parallel to the bottom guard plate, and a second support plate connected to the lower surface of the first support plate;

[0011] A plurality of supporting square tubes are fixedly connected to the first supporting plate, and the plurality of supporting square tubes are arranged at intervals along the length direction of the first supporting plate to form a collapse space between the first supporting plate and the electrical component.

[0012] Furthermore, a through hole is provided at the connection between the second support plate and the first support plate.

[0013] Furthermore, when the opening width of the through hole is set to o, 0.25m≥o≥0.15m.

[0014] Furthermore, an avoidance hole is provided at the center position in the length direction of the second support plate and along the width direction of the second support plate to avoid the reinforcing ribs of the bottom guard plate.

[0015] Furthermore, a bracket having a recessed portion formed by bending is fixedly connected between the first support plate and the second support plate; and a length direction of the bracket is the same as a length direction of the support frame.

[0016] Furthermore, foam is fixedly connected to the lower surface of the second support plate, and the foam at both ends of the second support plate extends out of the second support plate to form overlaps on the lower shell.

[0017] Further, when the width of the projection area is set to X and the width of the first support plate is set to AB, AB=X-2×(1-2) mm; and / or

[0018] When the length of the projection area is set to Y and the length of the first support plate is set to AA,

[0019] AA = Y-2 × (1-2) mm; and / or

[0020] The width of the bracket is set to C, and the widths of the two recessed portions are set to b and d respectively, then 0.25×C≥b=d≥0.2×C; and / or

[0021] The plane width between the two recessed portions is set to c, then 0.25×C≥c≥0.2×C; and / or

[0022] Assuming the widths of both edges of the bracket are a and e respectively, then 0.15×C≥a=e≥0.1×C.

[0023] Furthermore, when the distance between the end surfaces of the foam located at the two ends of the second support plate in the length direction is set to AC, AC=AA+2×10 mm.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] The battery shell bottom support structure described in the utility model strengthens the projection area of ​​the electrical components on the bottom guard plate by arranging a reinforcement member for protecting the electrical components between the lower shell and the bottom guard plate. When the projection area is subjected to external impact, the reinforcement member can reduce the deformation of the bottom guard plate caused by external impact or ball impact, thereby reducing the risk of tearing of the bottom guard plate and improving the safety of the electrical components inside the battery pack. At the same time, the reduction in the deformation of the bottom guard plate further reduces the possibility of sealing failure at the connection between the bottom guard plate and the lower shell due to deformation of the bottom guard plate. Ultimately, the impact resistance of the bottom of the battery pack is improved, and the deformation of the bottom of the battery pack when subjected to impact is reduced, so as to improve the ball impact and sealing of the battery pack.

[0026] Secondly, by setting the support frame and the support square tube, when the battery pack is impacted by the outside world, the second support plate can reduce the deformation of the bottom guard plate. When the external impact force is too large and causes the second support plate to deform, the gap between the first support plate and the second support plate provides space for the deformation of the second support plate, reducing the transmission of the impact force to the first support plate; when the first support plate is also deformed, the collapse space between the support square tube and the electrical parts reduces the transmission of external impact to the electrical parts, thereby protecting the electrical parts. And the spacing of the support square tubes provides a gas circulation space for the heat dissipation of the electrical parts.

[0027] In addition, by opening a through hole between the second support plate and the first support plate, the connection stiffness between the first support plate and the second support plate is reduced. When the second support plate close to the bottom guard plate is affected by the outside world, the second support plate is deformed at the location where the through hole is opened, thereby reducing the overall rigidity of the support frame and reducing the probability of external impact being transmitted to electrical components.

[0028] By setting the opening width of the through hole, a balance is achieved between the connection strength between the first support plate and the second support plate and the bending of the second support plate when the second support plate is impacted; at the same time, the opening of the through hole reduces the weight of the support frame, achieving cost reduction and efficiency improvement while reducing the overall weight of the battery pack, which helps to improve the vehicle's maneuverability.

[0029] By opening an avoidance hole at the second support plate, the support frame and the bottom guard plate can be fitted and fixed, thereby improving the compactness of the battery pack and reducing the volume of the entire battery pack after assembly.

[0030] By arranging a bracket with a recessed portion formed by bending between the first support plate and the second support plate, support for the first support plate and the second support plate is achieved; and since the recessed portion is arranged to provide a collapse space for the second support plate, the possibility of the impact force being directly transmitted to the electrical components due to a large external impact force is reduced.

[0031] At the same time, the setting of the foam can avoid direct contact between the second support plate and the bottom guard plate, reducing the possibility of wear and loss between the bottom guard plate and the support plate. Since the foam has a certain elasticity and softness, it can absorb external shocks and vibrations, thereby reducing the stress and vibration inside the battery pack.

[0032] By arranging the foam to protrude from the second support plate so that the foam is overlapped on the lower shell, the supporting points of the foam are increased, thereby improving the supporting stability of the foam.

[0033] By setting AB=X-2×(1~2)mm; AA=Y-2×(1~2)mm, the first support plate can protect the projection area as much as possible, and 1mm-2mm is reserved on both sides of the length direction and the width direction of the first support plate, which is conducive to installing the reinforcement between the lower shell and the bottom guard plate, and will not cause welding difficulties due to excessive gaps.

[0034] By setting AC=AA+2×10mm, 10mm is reserved at both ends of the foam, thereby ensuring the effective supporting area of ​​the foam.

[0035] The utility model also provides a battery pack, which is equipped with the battery shell bottom support structure as described above.

[0036] By assembling the battery shell bottom support structure as described above in the battery pack, the impact resistance of the area at the bottom of the battery pack where the electrical components are placed can be improved, the deformation of this area of ​​the battery pack when impacted can be reduced, and the occurrence of tearing or deformation of the bottom guard plate that leads to failure of the seal at the connection with the lower shell can be reduced, thereby improving the strength and sealing of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0038] Figure 1 The embodiment of the utility model is an exploded view showing the positional relationship between the electrical component and the lower housing;

[0039] Figure 2 The embodiment of the utility model is an exploded view showing the relative positions of the reinforcement member, the lower shell and the bottom guard plate;

[0040] Figure 3 This is a schematic diagram showing a projection area according to an embodiment of the utility model;

[0041] Figure 4 This is a part diagram showing a reinforcement member according to an embodiment of the utility model;

[0042] Figure 5 The embodiment of the present invention is an exploded view showing a reinforcement member.

[0043] Description of reference numerals: 1. reinforcement member;

[0044] 101, support frame; 1011, first support plate; 1012, second support plate; 102, support square tube;

[0045] 2. Lower shell;

[0046] 3. Bottom guard plate;

[0047] 301, reinforcement;

[0048] 4. Electrical parts;

[0049] 5. Projection area;

[0050] 6. Through hole;

[0051] 7. Avoidance hole;

[0052] 8. Bracket;

[0053] 801, recessed portion;

[0054] 9. Foam;

[0055] 1001. Top cold plate; 1002. Battery module. DETAILED DESCRIPTION

[0056] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0057] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0058] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0059] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0060] Embodiment 1

[0061] The present embodiment relates to a battery case bottom support structure to improve the impact resistance of the bottom of the battery pack and reduce the deformation of the bottom of the battery pack when it is impacted, thereby improving the sealing of the battery pack.

[0062] In terms of overall structure, the bottom support structure of the battery shell is arranged between the lower shell 2 and the bottom guard plate 3, and is used to protect the electrical components 4 above the bottom guard plate 3. The support structure includes: a reinforcement member 1, which is arranged in the projection area 5 of the electrical components 4 on the bottom guard plate 3 and is fixedly connected to the bottom guard plate 3 to reinforce the projection area 5.

[0063] By arranging a reinforcement 1 between the lower shell 2 and the bottom guard plate 3 to protect the electrical components 4, the projection area 5 of the electrical components 4 on the bottom guard plate 3 is reinforced. When the projection area 5 is subjected to external impact, the reinforcement 1 can reduce the deformation of the bottom guard plate 3 when subjected to external impact, thereby reducing the risk of tearing of the bottom guard plate 3 and improving the safety of the electrical components 4 inside the battery pack; at the same time, the reduction in the deformation of the bottom guard plate 3 further reduces the possibility of sealing failure at the connection between the bottom guard plate 3 and the lower shell 2 due to deformation of the bottom guard plate 3; ultimately, the impact resistance of the bottom of the battery pack is improved, and the deformation of the bottom of the battery pack when subjected to impact is reduced, so as to improve the sealing of the battery pack.

[0064] Based on the above overall introduction, the bottom support mechanism of the battery case in this embodiment is as follows: Figures 1 to 5 As shown, the battery pack includes a top cold plate 1001, a lower shell 2, a battery module 1002, an electrical component 4 and a bottom guard plate 3; the battery module 1002 and the electrical component 4 are located in the lower shell 2, the top cold plate 1001 is located above the lower shell 2 for cooling the battery module 1002, and the bottom guard plate 3 is located below the lower shell 2 for protecting the battery module 1002 and the electrical component 4. Specifically, the electrical component 4 is located on one side of the length direction of the lower shell 2, and is connected to the battery module 1002 to realize the energy control and management of the battery pack, and is used to adjust the charging and discharging process, ensure the safety of the battery and maximize the service life of the battery pack. The projection area 5 refers to the area in the lower shell 2 where the electrical component 4 is located and the correspondence with the bottom guard plate 3. The reinforcement 1 is located in the projection area 5, that is, the reinforcement 1 is located in the space formed by the bottom guard plate 3, the lower shell 2 and the electrical component 4.

[0065] In order to reduce the impact force transmitted to the electrical components 4 in the lower housing 2, as shown in FIG. Figure 4 and Figure 5As shown, the reinforcement 1 includes: a support frame 101, which is distributed in the same direction along the length direction of the projection area 5 and connected to the bottom guard plate 3. The cross-section of the support frame 101 is generally "U"-shaped, including a flat first support plate 1011 parallel to the bottom guard plate 3, and a second support plate 1012 connected to the lower surface of the first support plate 1011; a plurality of support square tubes 102, which are fixedly connected to the first support plate 1011, and the plurality of support square tubes 102 are arranged at intervals along the length direction of the first support plate 1011 to form a collapse space between the first support plate 1011 and the electrical component 4.

[0066] like Figures 2 to 5 As shown, during assembly, the connection between the second support plate 1012 and the first support plate 1011 is located on the side away from the reinforcing rib 301 of the bottom guard plate 3, so as to avoid the installation of the reinforcing rib 301 of the bottom guard plate 3 and reduce the possibility of interference. By setting the support frame 101 and the support square tube 102, when the battery pack is subjected to external impact, the second support plate 1012 can reduce the deformation of the bottom guard plate 3. When the external impact force is too large and causes the second support plate 1012 to also deform, the gap between the first support plate 1011 and the second support plate 1012 provides space for the deformation of the second support plate 1012, reducing the transmission of the impact force to the first support plate 1011; when the first support plate 1011 also deforms, the collapse space between the support square tube 102 and the electrical component 4 reduces the transmission of external impact to the electrical component 4, thereby protecting the electrical component 4. And the support square tube 102 is arranged at intervals to provide gas circulation space for the heat dissipation of the electrical component 4.

[0067] When the width of the projection area 5 is set to X and the width of the first support plate 1011 is set to AB, AB = X-2 × (1 ~ 2) mm. When the length of the projection area 5 is set to Y and the length of the first support plate 1011 is set to AA, AA = Y-2 × (1 ~ 2) mm. By setting AB = X-2 × (1 ~ 2) mm; AA = Y-2 × (1 ~ 2) mm, the first support plate 1011 can protect the projection area 5 as much as possible, and 1mm-2mm is reserved on both sides of the length direction and the width direction of the first support plate 1011, which is conducive to installing the reinforcement 1 between the lower shell 2 and the bottom guard plate 3, and will not cause welding difficulties due to excessive gaps.

[0068] The support square tubes 102 arranged at intervals can support the electrical components 4 while forming a collapsed space between the electrical components 4 and the first support plate 1011. The space can absorb the deformation of the first support plate 1011, and can also realize gas circulation at the electrical components 4, which is convenient for heat dissipation. Based on the above purposes and concepts, in this embodiment, the support square tubes 102 are equidistantly distributed along the length direction of the first support plate 1011, and 7 first support square tubes 102 are provided. The length direction of the support square tube 102 is the same as the width direction of the first support plate 1011. When the width of the first support plate 1011 is set to AB and the length of the support square tube 102 is set to i, i=AB; that is, the length of the support square tube 102 is equal to the width of the first support plate 1011.

[0069] In order to reduce the impact force transmitted to the electrical components 4 and prevent the support frame 101 from interfering with the bottom guard plate 3, as shown in FIG. Figure 4 and Figure 5 As shown, a through hole 6 is provided at the connection between the second support plate 1012 and the first support plate 1011. When the opening width of the through hole 6 is set to o, 0.25m≥o≥0.15m. By providing a through hole 6 between the second support plate 1012 and the first support plate 1011, the connection stiffness between the first support plate 1011 and the second support plate 1012 is reduced. When the second support plate 1012 close to the bottom guard plate 3 is subjected to external impact, the second support plate 1012 at the opening of the through hole 6 is deformed, reducing the overall rigidity of the support frame 101, so as to reduce the probability of external impact being transmitted to the electrical component 4. By setting the opening width of the through hole 6, a balance is achieved between the connection strength between the first support plate 1011 and the second support plate 1012 and the bending of the second support plate 1012 at this point when it is impacted; at the same time, the opening of the through hole 6 reduces the weight of the support frame 101, achieving cost reduction and efficiency improvement while reducing the overall weight of the battery pack, which helps to improve the maneuverability of the vehicle.

[0070] In order to make the structure of the support frame 101 more compact after assembly, Figure 4 and Figure 5 As shown, a avoidance hole 7 is provided at the center of the length direction of the second support plate 1012 and along the width direction of the second support plate 1012 to avoid the reinforcing rib 301 of the bottom guard plate 3. The width of the avoidance hole 7 is greater than the width of the reinforcing rib 301 in the middle of the bottom guard plate 3. By providing the avoidance hole 7 at the second support plate 1012, the support frame 101 and the bottom guard plate 3 are fitted and fixed, the compactness of the battery pack is improved, and the volume of the entire battery pack after assembly is reduced.

[0071] In order to improve the overall strength of the reinforcement 1, a bracket 8 having a recessed portion 801 formed by bending is fixedly connected between the first support plate 1011 and the second support plate 1012; the length direction of the bracket 8 is the same as the length direction of the support frame 101. If the length of the bracket 8 is set to A, then A=AA=Y-2×(1~2)mm. The bracket 8 is equal in width to the second support plate 1012, and two recessed portions 801 are formed along the width direction of the bracket 8. If the width of the bracket 8 is set to C, and the widths of the two recessed portions 801 are set to b and d respectively, then 0.25×C≥b=d≥0.2×C; if the plane width between the two recessed portions 801 is set to c, then 0.25×C≥c≥0.2×C; if the widths of the two edges of the bracket 8 are set to a and e respectively, then 0.15×C≥a=e≥0.1×C. If the bending angle radius formed when forming the recessed portion 801 is set to r, then r≥2mm, so as to avoid stress concentration caused by too small bending angle radius, which has the effect of improving the strength of the bracket 8.

[0072] By setting a bracket 8 with a recessed portion 801 formed by bending between the first support plate 1011 and the second support plate 1012, support for the first support plate 1011 and the second support plate 1012 is achieved; and since the recessed portion 801 is set to provide a collapse space for the second support plate 1012, the possibility of the impact force being directly transmitted to the electrical component 4 due to a large external impact force is reduced.

[0073] In order to reduce the vibration of the reinforcing member 1, foam 9 is fixedly connected to the lower surface of the second supporting plate 1012, and the foam 9 at both ends of the second supporting plate 1012 extends out of the second supporting plate 1012 to form an overlap on the lower shell 2. When the distance between the end faces of the foam 9 at both ends of the second supporting plate 1012 in the length direction is set to AC, AC=AA+2×10mm and the width of the foam 9 is the same as the width of the bracket 8. In this embodiment, the foam 9 is divided into multiple pieces along the length direction, and the multiple adjacent foams 9 are arranged at equal distances. If the distance between adjacent foams 9 is set to AG, in order to ensure the effective support area of ​​the foam 9, AG≤0.1×AA.

[0074] The arrangement of the foam 9 can prevent the second support plate 1012 from directly contacting the bottom guard plate 3, reducing the possibility of wear and tear caused by the contact between the bottom guard plate 3 and the support plate, and because the foam 9 has a certain elasticity and softness, it can absorb external impact and vibration, thereby reducing the stress and vibration inside the battery pack. By arranging the foam 9 to protrude from the second support plate 1012 so that the foam 9 is overlapped on the lower shell 2, the support points of the foam 9 are increased, thereby improving the support stability of the foam 9.

[0075] When the bottom support structure of the battery case of this embodiment is used, the bracket 8 is first welded to the side of the second support plate 1012 close to the first support plate 1011, so that the recessed portion 801 of the second support plate 1012 abuts against the second support plate 1012, and then the second support plate 1012 is welded to the first support plate 1011 to form the support frame 101; then a plurality of support square tubes 102 are welded to the upper surface of the first support plate 1011 at equal intervals along the length direction of the first support plate 1011 in sequence to form the reinforcement member 1. Foam 9 is pasted on the side wall of the reinforcement member 1 close to the bottom guard plate 3, that is, the foam 9 is pasted on the side of the second support plate 1012 away from the first support plate 1011; and then the reinforcement member 1 is assembled in the projection area 5. The reinforcement of the projection area 5 is completed.

[0076] By arranging a reinforcement 1 between the lower shell 2 and the bottom guard plate 3 to protect the electrical components 4, the projection area 5 of the electrical components 4 on the bottom guard plate 3 is reinforced. When the projection area 5 is subjected to external impact, the reinforcement 1 can reduce the deformation of the bottom guard plate 3 when subjected to external impact, thereby reducing the risk of tearing of the bottom guard plate 3 and improving the safety of the electrical components 4 inside the battery pack; at the same time, the reduction in the deformation of the bottom guard plate 3 further reduces the possibility of sealing failure at the connection between the bottom guard plate 3 and the lower shell 2 due to deformation of the bottom guard plate 3; ultimately, the impact resistance of the bottom of the battery pack is improved, and the deformation of the bottom of the battery pack when subjected to impact is reduced, so as to improve the sealing of the battery pack.

[0077] Embodiment 2

[0078] The present embodiment relates to a battery pack, including the battery case bottom support plate structure as described above. The present embodiment improves the impact resistance of the area where the battery pack bottom is placed to the electrical components 4 by assembling the battery case bottom support structure as described above in the battery pack, reduces the amount of deformation of the battery pack area that collapses when impacted, reduces the occurrence of tearing of the bottom guard plate 3 or deformation of the bottom guard plate 3 that causes failure of the seal at the connection between the bottom guard plate 3 and the lower shell 2, and improves the strength and sealing of the battery pack.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery housing bottom support structure, arranged between the lower housing and the bottom guard plate, used to protect the electrical components above the bottom guard plate, characterized in that: The support structure includes: The reinforcing member is arranged in the projection area of ​​the electrical member in the bottom guard plate and is fixedly connected to the bottom guard plate to reinforce the projection area.

2. The battery housing bottom support structure according to claim 1, characterized in that: The reinforcement member comprises: A support frame is distributed in the same direction along the length direction of the projection area and connected to the bottom guard plate. The support frame is generally in a "U" shape and includes a flat first support plate parallel to the bottom guard plate, and a second support plate connected to the lower surface of the first support plate; A plurality of supporting square tubes are fixedly connected to the first supporting plate, and the plurality of supporting square tubes are arranged at intervals along the length direction of the first supporting plate to form a collapse space between the first supporting plate and the electrical component.

3. The battery housing bottom support structure according to claim 2, characterized in that: A through hole is provided at the connection between the second supporting plate and the first supporting plate.

4. The battery housing bottom support structure according to claim 3, characterized in that: When the opening width of the through hole is set to o, 0.25m≥o≥0.15m.

5. The battery housing bottom support structure according to claim 2, characterized in that: At the center position of the second support plate in the length direction, an avoidance hole is opened along the width direction of the second support plate to avoid the reinforcing ribs of the bottom guard plate.

6. The battery housing bottom support structure according to claim 2, characterized in that: A bracket having a recessed portion formed by bending is fixedly connected between the first support plate and the second support plate; the length direction of the bracket is the same as the length direction of the support frame.

7. The battery housing bottom support structure according to claim 2, characterized in that: Foam is fixedly connected to the lower surface of the second support plate, and the foam located at two ends of the second support plate extends out of the second support plate to form an overlap on the lower shell.

8. The battery housing bottom support structure according to claim 7, characterized in that: When the width of the projection area is set to X and the width of the first support plate is set to AB, AB = X-2 × (1-2) mm; and / or When the length of the projection area is set to Y and the length of the first support plate is set to AA, AA = Y-2 × (1-2) mm; and / or The width of the bracket is set to C, and the widths of the two recessed portions are set to b and d respectively, then 0.25×C≥b=d≥0.2×C; and / or The plane width between the two recessed portions is set to c, then 0.25×C≥c≥0.2×C; and / or Assuming the widths of both edges of the bracket are a and e respectively, then 0.15×C≥a=e≥0.1×C.

9. The battery housing bottom support structure according to claim 8, characterized in that: When the distance between the end surfaces of the foam located at the two ends in the length direction of the second supporting plate facing each other is set to AC, AC=AA+2×10 mm.

10. A battery pack, characterized in that: The battery package is provided with the battery case bottom support structure as claimed in any one of claims 1 to 9.

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