Frame type battery box body with good sealing performance

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a frame type battery box body with good sealing performance, which comprises a frame, a support plate and a bottom protective plate, the support plate and the bottom protective plate are fixedly connected to the lower end of the frame, the support plate is positioned on the inner side of the bottom protective plate, and a first sealing piece for sealing a gap between the bottom protective plate and the frame is arranged between the bottom protective plate and the frame. According to the structural design of the frame type battery box body, the overall stability and impact resistance of the box body are effectively enhanced through the reasonable layout and connection mode of the supporting plates and the bottom protection plates. In the aspect of sealing performance, the first sealing piece and related bolt connection between the bottom protection plate and the frame, the riveting and bolt connection between the supporting plate and the frame and the bottom protection plate, and the sealing pieces are matched, so that the waterproof, dustproof, sound insulation and vibration isolation effects are greatly improved, external water vapor, dust and other impurities are effectively prevented from entering, the risks of battery short circuit, corrosion, poor heat dissipation and the like are reduced, and the service life is prolonged. Safe and stable operation of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technology field, concretely relates to a frame type battery box body with good sealing performance. BACKGROUND

[0002] In today's era of rapid development of science and technology, battery technology as the key support of many fields, its development is highly valued. Battery box as an important protective shell of battery system, its performance directly affects the overall performance and service life of the battery. Especially in the scene of large-scale application of batteries such as electric vehicles and energy storage power stations, the requirements for battery box are increasingly stringent.

[0003] In the complex and changeable actual use environment, the battery box may be disturbed by various external factors. For example, in a humid environment, water vapor is easy to enter the inside through the gap of the box. The existence of water vapor not only may cause internal short circuit of the battery, affect the normal charging and discharging function of the battery, but also may cause corrosion of the battery electrode, reduce the performance and life of the battery. At the same time, dust is also a problem that cannot be ignored, a large amount of dust entering the box may accumulate on the surface of the battery, affect the heat dissipation efficiency of the battery, and then cause local overheating of the battery, produce safety hazard. The current battery box has certain improvement space in the sealing structure, and the utility model aims to provide a new structure to improve its sealing performance. UTILITY MODEL CONTENT

[0004] In order to overcome the problems in the related art, the utility model discloses a frame type battery box body with good sealing performance, which improves the sealing performance of the box by optimizing the structure design, and ensures the stable operation of the battery pack in harsh environment.

[0005] To achieve the above purpose, one technical scheme adopted by the utility model is:

[0006] A frame type battery box body with good sealing performance, comprising a bottom plate, a frame fixedly connected with the bottom plate, and a sealing assembly arranged at the connection between the bottom plate and the frame, the frame comprising a surrounding frame fixedly connected with the periphery of the bottom plate, and the sealing assembly comprising a first sealing member arranged between the bottom plate and the surrounding frame for sealing the gap therebetween.

[0007] Further, the frame further comprises at least one cross beam arranged in the inner cavity enclosed by the surrounding frame and the bottom plate, the lower end of the cross beam is fixedly connected with the bottom plate, the at least one cross beam divides the inner cavity into at least two sub-cavities, and the sub-cavities are used for accommodating battery assemblies; the sealing assembly further comprises a second sealing member arranged at the connection between the cross beam and the bottom plate.

[0008] Further, the bottom plate comprises a support plate and a bottom guard arranged in sequence from top to bottom, the bottom guard has a circumferential portion beyond the circumferential edge of the support plate and arranged opposite to the frame; the circumferential portion of the bottom guard is provided with a plurality of first through holes, the frame has a plurality of first threaded blind holes corresponding to the first through holes one by one, the first sealing member has a plurality of second through holes corresponding to the first through holes one by one, the first sealing member is fixed between the bottom guard and the frame by the first bolt threaded in the first through hole, the second through hole and the first threaded blind hole, and the first bolt is provided with a first protection structure.

[0009] Further, the frame has a plurality of third through holes corresponding to the first through holes one by one, the third through holes are riveted with first rivets, and the first threaded blind holes are arranged on the first rivets.

[0010] Further, the circumferential edge of the support plate and the frame are fixed by friction welding; the lower end of the frame and the lower end of the cross beam are provided with a plurality of fifth through holes, the support plate is provided with a plurality of fourth through holes corresponding to the fifth through holes one by one, and the support plate and the frame are riveted and fixed by the second rivet threaded in the fourth through hole and the fifth through hole.

[0011] Further, the second rivet has a second threaded blind hole, the bottom guard has a plurality of sixth through holes corresponding to part of the second threaded blind hole at the position corresponding to the cross beam, and the support plate and the bottom guard are fixed by the second bolt threaded in the sixth through hole and the second threaded blind hole, and the second bolt is provided with a second protection structure.

[0012] Further, the sealing assembly further comprises a second sealing member sleeved outside the second bolt and located between the bottom guard and the support plate.

[0013] Further, a buffer pad is arranged between the support plate and the bottom guard.

[0014] Further, the support plate is provided with an insulating layer on the side close to the bottom guard and the side close to the frame, the insulating layer is made of polyimide, polyethylene, polytetrafluoroethylene or fluoroplastic material, and is formed by coating or spraying.

[0015] Further, the bottom guard is provided with a protective layer on the side away from the frame.

[0016] In conclusion, the frame type battery box with good sealing property has the following beneficial effects: in the structural design, the overall stability and impact resistance of the box body are effectively enhanced through the reasonable layout and connection mode of the supporting plate and the bottom guard plate, the bottom guard plate can first absorb and disperse the impact force when impacted, and the internal supporting plate and the battery pack are protected, in the sealing performance, the first sealing element and the related bolt connection between the bottom guard plate and the frame, the riveting and bolt connection between the supporting plate and the frame and the bottom guard plate and the cooperation of the sealing element greatly improve the waterproof, dustproof, sound insulation and vibration isolation effects, effectively prevent the impurities such as external water vapor and dust from entering, reduce the risks such as battery short circuit, corrosion and poor heat dissipation, and guarantee the safe and stable operation of the battery, in the anti-seismic aspect, the buffer pad can absorb and disperse vibration energy, in the safety, the insulating layer of the supporting plate can prevent electrical short circuit and electric shock accidents, in the durability of the bottom guard plate, the protective layer enhances the wear resistance and corrosion resistance, reduces the maintenance and replacement frequency, reduces the maintenance cost, prolongs the service life of the box body, and better meets the strict requirements of electric vehicles, energy storage power stations and other scenes on the battery box. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of this application, illustrate the illustrative embodiments of the present application and the description thereof, and serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0018] Figure 1 It is a perspective view of an embodiment of the frame type battery box with good sealing property of the utility model;

[0019] Figure 2 It is a top view of an embodiment of the frame type battery box with good sealing property of the utility model;

[0020] Figure 3 It is Figure 2 the structure of the enlarged schematic view of B;

[0021] Figure 4 It is Figure 2 the sectional view of A-A;

[0022] Figure 5 It is Figure 4 the structure of the enlarged schematic view of C;

[0023] Figure 6 It is Figure 5 the structure of the enlarged schematic view of D;

[0024] Figure 7 It is Figure 5 the structure of the enlarged schematic view of E;

[0025] Figure 8 It is Figure 5 the structure of the enlarged schematic view of F;

[0026] Figure 9 For Figure 2 schematic view of the hidden bottom guard plate and protective layer;

[0027] Figure 10 For Figure 9 enlarged schematic view of the structure at G;

[0028] Figure 11 For Figure 9 schematic view of the hidden first seal, second seal, buffer pad, first bolt and second bolt;

[0029] Figure 12 For Figure 11 enlarged schematic view of the structure at H;

[0030] Figure 13 For Figure 11 schematic view of the hidden first rivet and second rivet;

[0031] Figure 14 For Figure 13 enlarged schematic view of the structure at M;

[0032] Figure 15 For Figure 1 schematic view of the hidden first seal and second seal;

[0033] Figure 16 For Figure 15 enlarged schematic view of the structure at N.

[0034] The meanings of the various reference numerals in the drawings are as follows:

[0035] Bottom plate 1a, frame 1, first threaded blind hole 11, third through hole 12, first rivet 13, fifth through hole 14, surrounding frame 15, cross beam 16, support plate 2, fourth through hole 21, buffer pad 22, bottom guard plate 3, first through hole 31, sixth through hole 32, protective layer 33, sealing assembly 4a, first seal 4, second through hole 41, first bolt 5, second rivet 6, second threaded blind hole 61, second bolt 7, second seal 71, anti-skid pad 72. DETAILED DESCRIPTION

[0036] The present application will be further described below with reference to the drawings.

[0037] Please refer to Figures 1-16As shown, the frame type battery box body with good sealing property in the embodiment comprises a bottom plate 1a, a frame 1 fixedly connected with the bottom plate 1a, and a sealing assembly 4a arranged at the connecting position of the bottom plate 1a and the frame 1. The bottom plate 1a comprises a support plate 2 and a bottom guard plate 3 arranged in sequence from top to bottom, and the support plate 2 and the bottom guard plate 3 are both fixedly connected with the lower end of the frame 1. This structural design can protect the support plate 2. When the lower end of the box body is impacted, the bottom guard plate 3 as the first line of defense can effectively absorb and disperse the impact force, thereby reducing the damage to the support plate 2 and even the whole battery box body.

[0038] In the embodiment, the frame 1 comprises a surrounding frame 15 fixedly connected with the periphery of the bottom plate 1a, and the surrounding frame 15 is fixedly connected with the periphery of the bottom plate 1a to form an inner cavity together with the bottom plate 1a. The frame 1 further comprises at least one cross beam 16 fixedly arranged in the inner cavity, and the cross beam 16 divides the inner cavity into at least two sub-cavities for accommodating corresponding battery assemblies. The lower end of the cross beam 16 is fixedly connected with the bottom plate 1a, specifically with the support plate 2.

[0039] In the embodiment, the planar size of the bottom guard plate 3 is larger than that of the support plate 2, and the periphery of the bottom guard plate 3 beyond the support plate 2 is arranged opposite to the lower end surface of the surrounding frame 15 for fixed connection with the lower end surface of the surrounding frame 15. The support plate 2 is fixedly connected with the inner side surface of the frame 1 close to the lower end surface, and the support plate 2 can be threadedly connected with the cross beam 16 at the position corresponding to the cross beam 16.

[0040] In the embodiment, the sealing assembly 4a comprises a first sealing member 4 arranged between the bottom plate 1a and the frame 1, and a second sealing member 71 arranged between the bottom guard plate 3 and the support plate 2.

[0041] In the present embodiment, the first sealing member 4 is specifically arranged between the bottom guard plate 3 and the surrounding frame 15, and can be configured as a frame-shaped sealing ring matching the planar size of the surrounding frame 15. The first sealing member 4 is fixedly clamped between the surrounding frame 15 and the bottom guard plate 3 when the two are fixedly connected. In the present embodiment, the surrounding frame 15 and the bottom guard plate 3 are threadedly connected. Specifically, a plurality of first through holes 31 are arranged at the edge of the bottom guard plate 3 and are spaced apart around the edge of the bottom guard plate 3, and a plurality of first threaded blind holes 11 corresponding to the plurality of first through holes 31 are arranged at the edge (position of the surrounding frame 15) of the frame 1. The first sealing member 4 has a plurality of second through holes 41 corresponding to the plurality of first through holes 31. When the surrounding frame 15 and the bottom guard plate 3 are fixedly connected, first, the lower end surface of the surrounding frame 15 is made to face upward, the first sealing member 4 is placed at the lower end surface of the surrounding frame 15 (the lower end surface in this state faces upward), and the second through holes 41 on the first sealing member 4 are aligned with the first threaded blind holes 11 on the surrounding frame 15; then, the bottom guard plate 3 is placed at the lower end surface of the surrounding frame 15 (this state is that the bottom guard plate 3 is placed on the first sealing member 4), and the first through holes 31 on the bottom guard plate 3 are aligned with the second through holes 41 and the first threaded blind holes 11, respectively; finally, the first bolts 5 are sequentially threaded through the first through holes 31, the second through holes 41, and then threadedly connected with the first threaded blind holes 11. In this way, the sealing of the first sealing member 4 is realized at the same time when the bottom guard plate 3 and the surrounding frame 15 are assembled, without the need to separately arrange a sealing member assembly step, and effective sealing between the two is realized. This design not only effectively prevents external moisture, dust and other impurities from entering the box body, but also to some extent, isolates noise and vibration, providing a more quiet and stable operating environment for the battery pack.

[0042] In the present embodiment, the first sealing member 4 is made of rubber material, which has good sealing performance and aging resistance, and can maintain stable sealing effect during long-term use. At the same time, the elasticity of the rubber material can effectively absorb and disperse the vibration and noise generated by the box body when subjected to external impact, further improving the overall performance and comfort of the box body.

[0043] In the present embodiment, in order to reduce the weight of the frame 1, the frame 1 adopts a hollow frame structure. Therefore, in order to realize the threaded connection of the surrounding frame 15 and the bottom guard plate, strengthen the connection strength and strengthen the frame strength, each first threaded blind hole is realized by a first rivet 13 riveted in the surrounding frame 15. Specifically, a plurality of third through holes 12 corresponding to the plurality of first through holes 31 are arranged at the lower end surface of the frame, and a first rivet 13 is riveted at a position opposite to each third through hole 12 in the frame, and the first threaded blind hole 11 is arranged in the first rivet 13 and coaxially communicated with the third through hole 12. This design not only enhances the strength and stability of the edge of the frame 1, but also facilitates the installation and fixation of the first bolt 5.

[0044] In this embodiment, the edges of the support plate 2 are fixed to the surrounding frame 15 by friction welding. This connection method has the advantages of high strength, good sealing, and not easy to loosen, ensuring the stable connection between the support plate 2 and the frame 1. It is worth mentioning that in terms of sealing, friction welding technology can achieve seamless connection, avoiding the gaps or leaks that may occur in traditional connection methods. This high level of sealing is particularly important for applications that require the prevention of liquid, gas or small particle penetration, effectively ensuring the safety and stability of the system. Specifically, a step groove is provided on the inner side of the surrounding frame 15 near the lower end face, the step groove penetrates the inner side of the surrounding frame 15 towards the inner cavity, and the step groove also penetrates the lower end face of the surrounding frame 15 downwards, thus forming an L-shaped step groove. Before welding, the surrounding frame 15 is inverted and installed on the welding tool, then the support plate 2 is aligned and placed in the step groove. After placement, the edge upper end face of the support plate 2 should be flush with the upper end face of the surrounding frame 15, then the support plate 2 is fixed by the welding tool to ensure that the support plate 2 and the surrounding frame 15 remain fixed, completing the preparation work before welding. During welding, the welding equipment applies axial pressure to the contact surface of the edge of the support plate 2 and the step groove through the welding head and rotates at high speed. During high-speed rotation, the metal of the contact surface is heated to a high temperature due to friction, and when the temperature reaches the melting point of the metal, the metals of the two begin to melt and mix together under the action of rotation. During this process, the welding equipment controls the welding head to displace along the joint for one revolution. During this process, the metal in front of the travel trajectory will be heated to melting and mixed by friction, and the metal behind the travel trajectory will be cooled and solidified after the friction ends, thus forming a seamless weld. The hole formed after the welding head at the end of the welding trajectory is removed can be filled by repair welding to ensure the integrity and strength of the weld.

[0045] In this embodiment, the support plate 2 and the frame 1 are fixed by riveting. Specifically, the surrounding frame 15 and the cross beam 16 of the frame 1 have a plurality of fifth through holes 14, and the support plate 2 has a plurality of fourth through holes 21 corresponding to the fifth through holes 14. The second riveting member 6 is inserted through the fourth through hole 21 and the fifth through hole 14 to fix and further enhance the connection strength between the support plate 2 and the frame 1.

[0046] Further, the second riveting member 6 has a second threaded blind hole 61, and the bottom guard plate 3 has a plurality of sixth through holes 32 corresponding to part of the second threaded blind holes 61 at the position corresponding to the cross beam 16. The support plate 2 and the bottom guard plate 3 are fixed by the second bolt 7 inserted through the sixth through hole 32 and screwed with the second threaded blind hole 61. This connection can further enhance the stability of the entire box body.

[0047] In addition, the first bolt 5 and the second bolt 7 are respectively provided with a first protection structure and a second protection structure. In the embodiment, the first protection structure and the second protection structure are both anti-skid washers 72 arranged between the bolt head and the corresponding component. By arranging the anti-skid washers, the connection failure caused by loosening of the bolts can be effectively prevented when the box is subjected to vibration or external force impact, thereby ensuring the stability and sealing of the connection between components, avoiding the increase of structural gap caused by loosening of the bolts, and further preventing the intrusion of external water vapor, dust and other impurities into the box, thereby preventing damage to the key components such as the battery. In other embodiments, the protection structure can also use thread glue. The thread glue can fill the small gap between the bolt and the threaded hole, and after solidification, a high-strength bond is formed, further enhancing the reliability and stability of the bolt connection. Even in long-term complex working conditions, such as frequent temperature changes, humidity fluctuations and continuous vibration interference, the fastening state of the bolt can always be maintained, ensuring the integrity and sealing of the overall structure of the battery box and providing a solid guarantee for the safe and stable operation of the battery system.

[0048] In the embodiment, among the second threaded blind holes 61 corresponding to the position of the cross beam 16, one second threaded blind hole 61 is threadedly connected with the second bolt 7, and the left and right two second threaded blind holes 61 adjacent to it are not connected with the second bolt 7. These second threaded blind holes 61 connected with the second bolt 7 are part of the second threaded blind holes 61. Such arrangement can reduce unnecessary bolt connections to reduce the overall weight without affecting the structural strength.

[0049] In the embodiment, the second sealing member 71 can be arranged at the connection between the cross beam 16 and the support plate 2. Specifically, the second sealing member 71 is arranged outside the second bolt 7 and between the bottom guard plate 3 and the support plate 2, which further enhances the sealing effect and prevents moisture, dust and other impurities from entering the box through the bolt connection. The second sealing member 71 can also be made of rubber material, which has good sealing performance and aging resistance and can maintain stable sealing effect during long-term use.

[0050] In order to improve the anti-vibration performance of the box, a buffer pad 22 is arranged between the support plate 2 and the bottom guard plate 3, which effectively absorbs and disperses vibration energy and protects the battery pack from external impact. The buffer pad 22 can be made of rubber material or flexible material such as polyurethane foam. These materials not only have good shock absorption performance, but also can maintain stable form and performance during long-term use and are not easy to age or deform.

[0051] To improve the safety of the box, the support plate 2 near the bottom guard plate 3 side and near the frame 1 side are provided with insulation layers (not shown in the figure), which can be formed by coating or spraying to ensure uniform coverage on the surface of the support plate 2, forming a good insulation barrier. In terms of material selection, high-performance insulating materials such as epoxy resin, polyimide (PI), polyethylene, polytetrafluoroethylene (PTFE) or fluoroplastic can be considered. The selection of these insulating materials can be considered comprehensively according to the specific working environment of the box, temperature range, mechanical strength requirements and cost factors. By spraying these high-performance insulating materials, the insulation performance of the support plate 2 can be effectively improved to prevent electrical short circuit and electric shock accidents, thereby improving the overall safety of the box.

[0052] To significantly improve the wear resistance and corrosion resistance of the bottom guard plate 3 in actual application, and ensure that it can maintain excellent performance for a long time in harsh environments, the embodiment adds a protective layer 33 on the side of the bottom guard plate 3 away from the frame 1. This design not only enhances the surface strength of the bottom guard plate 3, effectively resisting friction and wear from the outside, but also effectively isolates corrosive substances from direct contact with the bottom guard plate substrate through the chemical stability and dense structure of the protective layer 33, thereby greatly reducing the risk of corrosion.

[0053] In specific implementation, the bottom guard plate 3 itself can be made of high-strength, wear-resistant alloy steel plate to ensure its basic structural strength and toughness. Then, on the side away from the frame 1, i.e. facing the external environment, a layer or multiple layers of protective layer 33 are uniformly applied by spraying, electroplating, thermal spraying or other surface treatment techniques. These protective layers may include wear-resistant ceramic coatings, corrosion-resistant resin coatings, galvanized layers or stainless steel alloy layers, and the specific choice depends on the expected working environment, cost budget and performance requirements.

[0054] Through such structural design and material application, the bottom guard plate 3 not only significantly improves its wear resistance and corrosion resistance, but also effectively reduces the frequency of box maintenance or replacement due to damage to the bottom guard plate, thereby providing users with longer service life and lower maintenance cost.

[0055] In conclusion, the utility model discloses provide a frame type battery box with good sealing, and the frame type battery box has many significant beneficial effects.In the structural design, through the reasonable layout and connecting mode of support plate and bottom guard plate, the overall stability and impact resistance of the box are effectively enhanced, the bottom guard plate can first absorb and disperse impact force when being impacted, and the internal support plate and battery pack are protected.In the sealing performance aspect, the first sealing element and related bolt connection between the bottom guard plate and the frame, riveting and bolt connection between the support plate and the frame and the bottom guard plate and cooperate with the sealing element greatly improve the waterproof, dustproof, sound insulation and vibration isolation effect, effectively prevent the impurities such as external water vapor and dust, reduce the risk of battery short circuit, corrosion and poor heat dissipation, and guarantee the safe and stable operation of the battery.In the aspect of shock resistance, the buffer pad can absorb and disperse vibration energy.In the safety, the insulation layer of the support plate can prevent electrical short circuit and electric shock accident.In the durability of the bottom guard plate, the protective layer enhances its wear resistance and corrosion resistance, reduces the frequency of maintenance and replacement, reduces the maintenance cost, prolongs the service life of the box, and better meets the strict requirements of electric vehicles, energy storage power stations and other scenes on the battery box.

[0056] The above embodiment only illustrates the principle and effect of the utility model, and is not used to limit the utility model.Anyone skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model.Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A frame type battery case having excellent sealing properties, characterized by: The frame comprises a surrounding frame fixedly connected with the periphery of the bottom plate, and the sealing assembly comprises a first sealing member arranged between the bottom plate and the surrounding frame for sealing the gap therebetween.

2. The frame type battery case with excellent sealing according to claim 1, characterized by: The frame further comprises at least one cross beam arranged in the inner cavity enclosed by the surrounding frame and the bottom plate, the lower end of the cross beam being fixedly connected with the bottom plate, and the at least one cross beam divides the inner cavity into at least two sub-cavities for accommodating corresponding battery assemblies; the sealing assembly further comprises a second sealing member arranged at the connection between the cross beam and the bottom plate.

3. The frame type battery case with excellent sealing according to claim 2, characterized by: The bottom plate comprises a support plate and a bottom guard plate arranged in sequence from top to bottom, the bottom guard plate has a peripheral portion beyond the periphery of the support plate and arranged opposite to the surrounding frame; the peripheral portion of the bottom guard plate is provided with a plurality of first through holes, the surrounding frame has a plurality of first threaded blind holes corresponding to the plurality of first through holes one by one, the first sealing member has a plurality of second through holes corresponding to the plurality of first through holes one by one, and the first sealing member is fixed between the bottom guard plate and the surrounding frame by first bolts threadedly connected with the first threaded blind holes and arranged in the first through holes and the second through holes.

4. The well-sealed frame-type battery case according to claim 3, characterized by: The surrounding frame has a plurality of third through holes corresponding to the plurality of first through holes one by one, and the third through holes are riveted with first riveting members, and the first threaded blind holes are arranged on the first riveting members.

5. The well-sealed frame-type battery case according to claim 3, characterized by: The periphery of the support plate and the surrounding frame are fixed by friction welding; the lower end of the surrounding frame and the lower end of the cross beam of the frame each have a plurality of fifth through holes, the support plate has a plurality of fourth through holes corresponding to the plurality of fifth through holes one by one, and the support plate and the frame are rivet-fixed by second riveting members arranged in the fourth through holes and the fifth through holes.

6. The well-sealed frame-type battery case according to claim 5, characterized by: The second riveting members have second threaded blind holes, the bottom guard plate has a plurality of sixth through holes corresponding to the second threaded blind holes one by one at the positions corresponding to the cross beams, and the support plate and the bottom guard plate are fixed by second bolts threadedly connected with the second threaded blind holes and arranged in the sixth through holes.

7. The well-sealed frame battery case of claim 6, wherein: The sealing assembly further comprises a second sealing member sleeved outside the second bolts and located between the bottom guard plate and the support plate.

8. The well-sealed frame-type battery case according to claim 3, characterized by: A buffer pad is arranged between the support plate and the bottom guard plate.

9. The well-sealed frame-type battery case according to claim 3, characterized by: The side of the support plate close to the bottom guard plate and the side of the support plate close to the frame each have an insulating layer formed by coating or spraying polyimide, polyethylene, polytetrafluoroethylene or fluoroplastic material.

10. The well-sealed frame-type battery case according to claim 3, characterized by: The side of the bottom guard plate away from the frame has a protective layer.

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