Bottom protection plate structure of battery pack, battery pack and electric equipment

Abstract

The utility model relates to a bottom protection plate structure of a battery pack, the battery pack and electric equipment, the bottom protection plate structure comprises a bottom plate body, the bottom plate body is provided with a liquid discharge port and an energy absorption structure, the liquid discharge port is used for installing a liquid discharge valve, and the energy absorption structure is arranged around the circumferential direction of the liquid discharge port and can deform to absorb energy under the action of external force. According to the technical scheme, the bottom guard plate structure of the battery pack can reduce the possibility of failure of a sealing surface at the mounting position of the drain valve after the drain valve is subjected to bottom mechanical impact, and the safety of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of battery pack, in particular, to a bottom guard plate structure of a battery pack, the battery pack and an electric device. BACKGROUND

[0002] In the related art, a drain valve is usually arranged on the bottom guard plate of the battery pack to solve the problem of thermal runaway of the battery pack caused by leakage of the cooling liquid in the battery pack. However, after the drain valve is subjected to mechanical impact from the bottom, for example, the sealing surface at the installation position of the drain valve is prone to failure, resulting in sealing failure of the battery pack. SUMMARY

[0003] The purpose of the present disclosure is to provide a bottom guard plate structure of a battery pack, the battery pack and an electric device to reduce the possibility of sealing surface failure at the installation position of the drain valve after the drain valve is subjected to mechanical impact from the bottom, for example, to at least partially solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a bottom guard plate structure of a battery pack, the bottom guard plate structure comprising a bottom plate body, the bottom plate body having a drain port and an energy absorption structure, the drain port being used for mounting a drain valve, the energy absorption structure being arranged around the circumference of the drain port and being configured to be deformed to absorb energy under the action of an external force.

[0005] Optionally, the energy absorption structure comprises an annular structure arranged around the circumference of the drain port, the annular structure extending in a curve along the radial direction.

[0006] Optionally, the bottom plate body comprises a first plate-shaped area inside the energy absorption structure and a second plate-shaped area outside the energy absorption structure, the first plate-shaped area and the second plate-shaped area being flush or misaligned in the direction along the center line of the drain port, and the annular structure being located between the first plate-shaped area and the second plate-shaped area.

[0007] Optionally, the first plate-shaped area and the second plate-shaped area are flush in the direction along the center line of the drain port, and the annular structure is concave toward the inside of the battery pack and / or convex toward the outside of the battery pack.

[0008] Optionally, the number of the energy absorption structures is one or more, and the plurality of energy absorption structures are arranged at intervals along the radial direction.

[0009] Optionally, the energy absorption structure is a stamping structure.

[0010] Optionally, the bottom plate body comprises a base plate, the drain port is arranged on the base plate, and the energy absorption structure is arranged on the base plate.

[0011] Optionally, the bottom plate body comprises a base plate and a reinforcing plate, the base plate is provided with a mounting hole, the reinforcing plate is connected to the base plate and covers the mounting hole, the liquid discharge port is arranged on the reinforcing plate, and the energy absorption structure is arranged on the reinforcing plate.

[0012] Optionally, the elastic modulus of the reinforcing plate is greater than the elastic modulus of the base plate.

[0013] Optionally, the reinforcing plate is bonded to the outer wall surface of the base plate facing the outside of the battery pack.

[0014] The second aspect of the present disclosure provides a battery pack comprising a liquid discharge valve and the bottom guard plate structure of the battery pack provided in the first aspect.

[0015] Optionally, the bottom guard plate structure has an inner surface facing the inside of the battery pack and an outer surface opposite to the inner surface, the liquid discharge valve has a liquid discharge channel that can be opened and closed to communicate between the inside and the outside of the battery pack, and a sealing surface surrounding the liquid discharge channel and fitted to the outer surface, at least one annular sealing element surrounding the liquid discharge channel is arranged between the sealing surface and the outer surface, and / or the outer diameter of the sealing surface is 5-7 mm.

[0016] The third aspect of the present disclosure provides a power consumption device comprising the battery pack provided in the second aspect.

[0017] Through the above technical solution, i.e., the bottom guard plate structure of the battery pack provided by the present disclosure, the bottom plate body is provided with an energy absorption structure, and the energy absorption structure is arranged around the circumferential direction of the liquid discharge port and is configured to deform and absorb energy under the action of an external force. In this way, when the liquid discharge valve installed at the liquid discharge port of the bottom plate body is subjected to, for example, a bottom mechanical impact, the energy absorption structure can deform and absorb energy, thereby absorbing the deformation amount of the liquid discharge valve after being impacted, improving the impact resistance of the liquid discharge valve, and achieving the purpose of reducing the possibility of failure of the sealing surface at the installation position of the liquid discharge valve after the liquid discharge valve is subjected to, for example, a bottom mechanical impact.

[0018] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the following specific embodiments, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 is a structural schematic diagram of a battery pack provided in an exemplary embodiment of the present disclosure;

[0021] Figure 2is an exploded view of a battery pack provided in the exemplary embodiment of the present disclosure;

[0022] Figure 3 is a schematic view of a drain valve of a battery pack provided in the exemplary embodiment of the present disclosure installed on a bottom plate body;

[0023] Figure 4 is an exploded view of a battery pack provided in the exemplary embodiment of the present disclosure;

[0024] Figure 5 is a structural schematic view of a bottom plate body provided in the first embodiment of the present disclosure;

[0025] Figure 6 is Figure 5 is a partial schematic view in the direction of A-A;

[0026] Figure 7 is a structural schematic view of a bottom plate body provided in the second embodiment of the present disclosure;

[0027] Figure 8 is another angle of a structural schematic view of a bottom plate body provided in the second embodiment of the present disclosure;

[0028] Figure 9 is Figure 8 is a partial schematic view in the direction of B-B.

[0029] Explanation of Reference Signs

[0030] 1 - bottom plate body; 110 - drain port; 120 - energy absorbing structure; 121 - annular structure; 130 - first plate-shaped region; 140 - second plate-shaped region; 150 - base plate; 151 - mounting port; 152 - outer wall surface; 160 - reinforcing plate; 170 - inner surface; 180 - outer surface; 2 - drain valve; 210 - drain passage; 220 - sealing surface; 230 - annular sealing member; 240 - valve body; 241 - mounting hole; 242 - liquid inlet port; 250 - plugging member; 260 - elastic member; 270 - expansion member; 3 - housing; 4 - battery module; 5 - cooling module. DETAILED DESCRIPTION

[0031] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0032] In the present disclosure, "inner, outer" refers to the inner, outer relative to the outline of the component or structure itself, unless otherwise stated. In addition, it should be noted that the terms used, such as "first, second", etc., are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, in the description referring to the drawings, the same reference signs in different drawings represent the same elements.

[0033] According to a first aspect of the present disclosure, a bottom guard plate structure of a battery pack is provided, as shown in Figures 1 to 9 , the bottom guard plate structure comprises a bottom plate body 1, the bottom plate body 1 has a drain port 110 and an energy absorption structure 120, the drain port 110 is used to install a drain valve 2, and the energy absorption structure 120 is arranged around the circumference of the drain port 110 and is configured to deform and absorb energy under the action of an external force.

[0034] By the above technical solution, i.e. the bottom guard plate structure of the battery pack provided by the present disclosure, the bottom guard plate structure is provided with the energy absorption structure 120 on the bottom plate body 1, and the energy absorption structure 120 is arranged around the circumference of the drain port 110 and is configured to deform and absorb energy under the action of an external force, so that when the drain valve 2 installed at the drain port 110 of the bottom plate body 1 is subjected to, for example, a bottom mechanical impact, the energy absorption structure 120 can deform and absorb energy, thereby absorbing the deformation amount of the drain valve 2 after being impacted, improving the impact resistance of the drain valve 2, and achieving the purpose of reducing the possibility of the appearance of seal surface failure at the installation position of the drain valve 2 after the drain valve 2 is subjected to, for example, a bottom mechanical impact.

[0035] In some embodiments, as shown in Figures 5 to 9 , the energy absorption structure 120 can include an annular structure 121 arranged around the circumference of the drain port 110, and the annular structure 121 extends in a curve along the radial direction, so that by configuring the energy absorption structure 120 as the annular structure 121 extending in a curve along the radial direction (which can refer to the up-down direction of the figure in Figure 6 or Figure 9 ), the plate body of the bottom plate body 1 at the annular structure 121 is more likely to deform than the straight plate structure at the drain port 110 when the drain valve 2 installed at the drain port 110 of the bottom plate body 1 is subjected to, for example, a bottom mechanical impact, so that by the deformation and energy absorption of the energy absorption structure 120 configured as the annular structure 121, the deformation amount of the drain valve 2 after being impacted can be absorbed, and the deformation amount at the drain valve 2 is reduced, thereby achieving the purpose of reducing the possibility of the appearance of seal surface failure at the installation position of the drain valve 2 due to the large deformation amount of the drain valve 2.

[0036] It should be noted that the radial cross-sectional shape of the curve can be, for example, semicircular or V-shaped or wavy, etc. to form the annular structure 121, and the present disclosure does not specifically limit such deformation methods, and those skilled in the art can adaptively design according to actual application requirements.

[0037] In addition, the energy absorption structure 120 described above can be a stamping structure, which is simple in structure and easy to install and manufacture, that is, it can be understood that a mold and a stamping device (not shown) can be used to apply pressure to the bottom plate body 1, so that the bottom plate body 1 is plastically deformed, thereby obtaining the energy absorption structure 120 described above. Of course, the present disclosure does not specifically limit the specific structure and size of the annular structure 121 of the energy absorption structure 120, and those skilled in the art can adaptively design according to actual application requirements, and the purpose is to be able to deform and absorb energy under the action of external force.

[0038] In addition, the energy absorption structure 120 described above can be an embodiment formed by a stamping structure process, which is exemplary, and in other embodiments, a forming process such as hot stamping or hydraulic stretching can be used to form the energy absorption structure 120 on the bottom plate body 1. The present disclosure is not limited to this.

[0039] In some embodiments, referring to Figures 5 to 9 As shown, the bottom plate body 1 can include a first plate-shaped area 130 inside the energy absorption structure 120 and a second plate-shaped area 140 outside the energy absorption structure 120, the first plate-shaped area 130 and the second plate-shaped area 140 are flush or misaligned in the direction along the center line of the drain port 110 (wherein the center line can be a virtual line passing through the center of the drain port 110 and perpendicular to the inner surface 170, which can refer to the left-right direction of the figure in Figure 6 Or Figure 9 The annular structure 121 is located between the first plate-shaped area 130 and the second plate-shaped area 140, so that when the drain valve 2 installed at the drain port 110 of the bottom plate body 1 is subjected to, for example, a bottom mechanical impact, the energy absorption structure 120 will deform, that is, the plate body at the first plate-shaped area 130 can move relative to the plate body at the second plate-shaped area 140, so that under the action of the external force (bottom mechanical impact), the plate body at the first plate-shaped area 130 and the drain valve 2 thereon move together, thereby absorbing part of the energy of the external force through the deformation of the plate body at the first plate-shaped area 130, that is, the deformation amount of the drain valve 2 after being impacted is absorbed by the deformation energy absorption of the plate body at the first plate-shaped area 130, which can reduce the deformation amount of the drain valve 2 at the installation position, so as to reduce the possibility of the sealing surface failure caused by the large deformation amount of the drain valve 2 at the installation position, and help to improve the impact resistance of the drain valve 2.

[0040] Exemplarily, as Figure 6and Figure 9 As shown, the first plate-shaped region 130 and the second plate-shaped region 140 can be flush in the direction along the center line of the drain port 110, and the annular structure 121 is concave towards the inner side of the battery pack, so that when the drain valve 2 installed at the drain port 110 of the bottom plate body 1 is subjected to, for example, a bottom mechanical impact, the annular structure 121 of the energy-absorbing structure 120 can be deformed, that is, the plate body at the first plate-shaped region 130 can be moved relative to the plate body at the second plate-shaped region 140 towards the inner side of the battery pack, so as to absorb the deformation amount of the drain valve 2 after being impacted, reduce the deformation amount at the drain valve 2, and reduce the possibility of the sealing surface at the installation position of the drain valve 2 failing to appear due to a large deformation amount of the drain valve 2.

[0041] Of course, alternatively, the annular structure 121 can also be configured to be convex towards the outer side of the battery pack, or the annular structure 121 can also be configured to be, for example, wavy, so that the wavy annular structure 121 is concave towards the inner side of the battery pack and convex towards the outer side of the battery pack. The present disclosure does not specifically limit such deformation modes, and those skilled in the art can adaptively design according to actual application requirements.

[0042] In addition, in some embodiments, the number of energy-absorbing structures 120 can be one or more, and when the number of energy-absorbing structures 120 is multiple, the multiple energy-absorbing structures 120 can be arranged at a radial interval, so as to be able to absorb a larger deformation amount of the drain valve 2 after being impacted by the multiple energy-absorbing structures 120, thereby helping to improve the impact resistance of the drain valve 2 and reduce the possibility of the sealing surface at the installation position of the drain valve 2 failing to appear after the drain valve 2 is subjected to, for example, a bottom mechanical impact.

[0043] The bottom plate body 1 can be adaptively designed according to actual application requirements, for example, in some embodiments, referring to Figure 5 and Figure 6 As shown, the bottom plate body 1 can include a base plate 150, the drain port 110 is arranged on the base plate 150, and the energy-absorbing structure 120 is also arranged on the base plate 150, so that when the drain valve 2 installed at the drain port 110 of the bottom plate body 1 is subjected to, for example, a bottom mechanical impact, the energy-absorbing structure 120 on the base plate 150 can be deformed to absorb energy, thereby being able to absorb the deformation amount of the drain valve 2 after being impacted, improve the impact resistance of the drain valve 2, and achieve the purpose of reducing the possibility of the sealing surface at the installation position of the drain valve 2 failing to appear after the drain valve 2 is subjected to, for example, a bottom mechanical impact.

[0044] Alternatively, for example, in other embodiments, referring to Figures 7 to 9As shown, the bottom plate body 1 can also be configured to include a base plate 150 and a reinforcing plate 160, the base plate 150 is provided with a mounting opening 151, the reinforcing plate 160 is connected to the base plate 150 and covers the mounting opening 151, the liquid discharge port 110 is arranged on the reinforcing plate 160, and the energy absorption structure 120 is arranged on the reinforcing plate 160. Thus, since the reinforcing plate 160 has a smaller size than the overall size of the base plate 150, and the plate structure of the reinforcing plate 160 is relatively simple, arranging the energy absorption structure 120 on the reinforcing plate 160 also facilitates on-site processing and manufacturing, thereby reducing production costs.

[0045] It should be noted that the reinforcing plate 160 can be bonded to the outer wall surface 152 of the base plate 150 facing the outside of the battery pack. Thus, the adhesive installation is convenient and beneficial to the lightweight design of the battery pack. In addition, since the reinforcing plate 160 is bonded to the outer wall surface 152 of the base plate 150 facing the outside of the battery pack, after the liquid discharge valve 2 is subjected to, for example, a mechanical impact at the bottom (for example, the force F1 shown) Figure 9 The reinforcing plate 160 covers the mounting opening 151, which can effectively reduce the risk of the reinforcing plate 160 falling off due to the external force F1, and help improve the reliability of the connection of the reinforcing plate 160.

[0046] Of course, the above-mentioned specific embodiment that the reinforcing plate 160 is bonded to the outer wall surface 152 of the base plate 150 facing the outside of the battery pack is exemplary. For example, in another embodiment not shown, the reinforcing plate 160 can also be fixedly connected to the outer wall surface 152 of the base plate 150 facing the outside of the battery pack by welding, or can be stably connected to the outer wall surface 152 of the base plate 150 facing the outside of the battery pack by, for example, a fastener such as a fastening bolt. It should be noted that as long as the reinforcing plate 160 and the base plate 150 have high connection reliability, the reinforcing plate 160 can also be fixedly connected to the inner wall surface of the base plate 150 facing the inside of the battery pack (the inner wall surface is arranged opposite to the above-mentioned outer wall surface 152). The present disclosure does not specifically limit such a transformation mode, and those skilled in the art can adaptively design according to the actual application requirements, and the purpose is to stably connect the reinforcing plate 160 to the base plate 150.

[0047] In addition, in some embodiments, the elastic modulus of the reinforcing plate 160 can be greater than the elastic modulus of the base plate 150, so that by configuring the material of the reinforcing plate 160 to be softer than the material of the base plate 150, the deformation of the reinforcing plate 160 relative to the base plate 150 can be better realized after the drain valve 2 is subjected to, for example, a bottom mechanical impact, which helps to absorb the deformation amount of the drain valve 2 after the impact, improves the impact resistance of the drain valve 2, and achieves the purpose of reducing the possibility of failure of the sealing surface at the installation position of the drain valve 2 after the drain valve 2 is subjected to, for example, a bottom mechanical impact.

[0048] For example, the material of the reinforcing plate 160 can be HC340 / 590DP, which has a tensile strength of 590 MPa and a yield strength of 340 MPa-440 MPa.

[0049] Correspondingly, the material of the base plate 150 can be HC420 / 780DP, which has a tensile strength of 780 MPa-900 MPa and a yield strength of 420 MPa-550 MPa. Since the reinforcing plate 160 and the base plate 150 have the same material properties, it is also beneficial to improve the mechanical properties of the reinforcing plate 160 and the base plate 150 after, for example, welding and fixing, and to improve the reliability of the connection between the reinforcing plate 160 and the base plate 150. Of course, the materials of the reinforcing plate 160 and the base plate 150 are not limited to this, and those skilled in the art can adaptively design according to actual application requirements.

[0050] According to a second aspect of the present disclosure, a battery pack is provided, which includes the drain valve 2 and the bottom guard plate structure of the battery pack provided in the first aspect. The battery pack has all the beneficial effects of the bottom guard plate structure provided in the first aspect, and the present disclosure will not be repeated here.

[0051] In some embodiments, referring to Figures 1 to 3 As shown, the battery pack can further include a shell 3, and the bottom plate body 1 is covered in the shell 3 to form a space inside the shell 3 for placing the battery module 4 and the cooling module 5 for cooling the battery module 4. By installing the drain valve 2 at the drain port 110 of the bottom plate body 1, when the cooling liquid leaks inside the shell 3 of the battery pack, the cooling liquid can flow onto the bottom plate body 1 and be drained through the drain valve 2 on the bottom plate body 1, thereby solving the problem of, for example, thermal runaway of the battery pack caused by leakage of the cooling liquid in the battery pack.

[0052] For example, as Figure 4As shown, the drain valve 2 can include a valve body 240 having a drain passage 210 for liquid to flow through to drain the liquid from the inside of the battery pack 3, an expansion member 270 (for example, including multi-layer water-absorbing expansion paper) located in the drain passage 210 to drive the sealing member 250 to move relative to the valve body 240 by water-absorbing expansion to open the drain passage 210, and an elastic member 260 located in the drain passage 210 and connected to the valve body 240 and the sealing member 250 to provide the elastic force of the sealing member 250 to close the drain passage 210. The top end of the valve body 240 is provided with a mounting hole 241 for the elastic member 260 to be connected. Thus, when the cooling liquid in the battery pack leaks to flow through the bottom plate body 1 and then flows into the drain passage 210 through the liquid inlet 242 provided on the valve body 240, the expansion member 270 absorbs water to expand to drive the sealing member 250 to move away from the valve body 240 to open the drain passage 210, so that the cooling liquid can be drained from the inside of the battery pack to the outside of the battery pack through the drain passage 210. After the liquid is drained, the elastic member 260 drives the sealing member 250 to move towards the valve body 240 to close the drain passage 210. The present disclosure is not limited thereto.

[0053] In addition, in some embodiments, reference is made to Figures 1 to 9 As shown, the bottom guard plate structure can have an inner surface 170 facing the inside of the battery pack and an outer surface 180 opposite to the inner surface 170. The drain valve 2 has the above-mentioned drain passage 210 which can be opened and closed to communicate between the inside and outside of the battery pack, and a sealing surface 220 surrounding the drain passage 210 and adhering to the outer surface 180. At least one annular sealing member 230 is provided between the sealing surface 220 and the outer surface 180 to surround the drain passage 210. Thus, the installation surface of the drain valve 2 and the bottom plate body 1 can be sealed by providing the annular sealing member 230.

[0054] For example, the annular sealing member 230 can be configured as a sealing ring, and the material of the sealing ring can be, for example, solid silicone material, and the creep compression deformation amount of the sealing ring is 30%-50%, and the corresponding Shore hardness is 30°-70°, so as to ensure that the sealing ring can ensure higher airtightness of the installation surface of the drain valve 2 and the bottom plate body 1, and at the same time, when the drain valve 2 is subjected to, for example, bottom mechanical impact, the deformation of the sealing ring can also absorb the deformation amount of the drain valve 2 after being impacted, so as to improve the impact resistance of the drain valve 2, so as to achieve the purpose of reducing the possibility of the sealing surface failure at the installation position of the drain valve 2 after the drain valve 2 is subjected to, for example, bottom mechanical impact.

[0055] Alternatively, the material of the sealing ring can also be, for example, foamed silica gel, which is softer than the solid silica gel material, and can absorb a larger deformation of the drain valve 2 after being impacted when the drain valve 2 is impacted by, for example, a bottom mechanical impact. The present disclosure does not specifically limit such deformation modes, and those skilled in the art can adaptively design according to actual application requirements.

[0056] In addition, in some embodiments, the outer diameter D of the sealing surface 220 can be, for example, 5-7 mm, which helps to ensure that the drain valve 2 has a larger sealing contact area with the outer surface 180 of the bottom body 1, so as to achieve multiple sealing by containing multiple sets of annular sealing members 230 in the valve body 240. Not only can the sealing effect at the mounting surface of the drain valve 2 and the bottom body 1 be further improved, but also the larger deformation of the drain valve 2 after being impacted can be absorbed by the multiple sets of annular sealing members 230, thereby improving the impact resistance of the drain valve 2 to reduce the possibility of sealing surface failure at the mounting position of the drain valve 2 after being impacted by, for example, a bottom mechanical impact. The present disclosure is not limited to this, and those skilled in the art can adaptively design the outer diameter of the sealing surface 220 according to actual application requirements.

[0057] According to a third aspect of the present disclosure, a power consuming device is provided, which includes the battery pack provided in the second aspect. The power consuming device has all the beneficial effects of the battery pack provided in the second aspect, and the present disclosure will not be repeated here.

[0058] In some exemplary application scenarios, the power consuming device can be a vehicle, which can be a new energy vehicle, such as a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc., and the present disclosure does not specifically limit this.

[0059] Of course, in other application scenarios, the power consuming device can also be, for example, a carrier in the energy storage field, aerospace, or water transportation, etc., which needs to be powered by a battery pack.

[0060] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0061] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0062] Furthermore, the various embodiments of the present disclosure can be arbitrarily combined with each other unless they contradict each other, and it should be understood that the same should be construed as being included in the disclosure of the present disclosure.

Claims

1. A bottom guard plate structure of a battery pack, characterized in that: The bottom guard plate structure includes a bottom plate body, which has a drain port and an energy absorption structure. The drain port is used to install a drain valve, and the energy absorption structure is arranged around the circumference of the drain port and is constructed to be able to deform and absorb energy under the action of external force.

2. The bottom guard plate structure of the battery pack according to claim 1, characterized in that: The energy absorbing structure includes an annular structure circumferentially arranged around the drain port, and the annular structure extends in a curved shape along a radial direction.

3. The bottom guard plate structure of the battery pack according to claim 2, characterized in that: The bottom plate body includes a first plate-shaped area located on the inner side of the energy absorbing structure and a second plate-shaped area located on the outer side of the energy absorbing structure. The first plate-shaped area and the second plate-shaped area are aligned or offset in the direction along the center line of the drain port, and the annular structure is located between the first plate-shaped area and the second plate-shaped area.

4. The bottom guard plate structure of the battery pack according to claim 3, characterized in that: The first plate-shaped area and the second plate-shaped area are aligned in a direction along a center line of the drain port, and the annular structure is concave toward the inside of the battery pack and / or convex toward the outside of the battery pack.

5. The bottom guard plate structure of the battery pack according to claim 1, characterized in that: There are one or more energy absorbing structures, and the multiple energy absorbing structures are arranged at intervals along the radial direction.

6. The bottom guard plate structure of the battery pack according to any one of claims 1 to 5, characterized in that: The energy absorbing structure is a stamping structure.

7. The bottom guard plate structure of the battery pack according to any one of claims 1 to 5, characterized in that: The bottom plate body includes a base plate, the liquid discharge port is arranged on the base plate, and the energy absorbing structure is arranged on the base plate.

8. The bottom guard plate structure of the battery pack according to any one of claims 1 to 5, characterized in that: The bottom plate body includes a base plate and a reinforcement plate. The base plate is provided with a mounting port. The reinforcement plate is connected to the base plate and covers the mounting port. The drain port is provided on the reinforcement plate. The energy absorption structure is provided on the reinforcement plate.

9. The bottom guard plate structure of the battery pack according to claim 8, characterized in that: The elastic modulus of the reinforcing plate is greater than the elastic modulus of the base plate.

10. The bottom guard plate structure of the battery pack according to claim 8, characterized in that: The reinforcing plate is bonded to an outer wall surface of the substrate facing the outside of the battery pack.

11. A battery pack, characterized in that: A bottom guard plate structure of a battery pack comprising a drain valve and any one of claims 1-10.

12. The battery pack according to claim 11, wherein: The bottom guard plate structure has an inner surface facing the inside of the battery pack and an outer surface opposite to the inner surface. The drain valve has a drain channel that can be opened and closed to connect the inside and outside of the battery pack, and a sealing surface surrounding the drain channel and adhered to the outer surface. At least one annular seal surrounding the drain channel is provided between the sealing surface and the outer surface, and / or the outer diameter of the sealing surface is 5mm-7mm.

13. An electrical device, characterized in that: Including the battery pack according to claim 11 or 12.

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