Bottom protection plate and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a bottom protection plate and a battery pack, the bottom protection plate has a thickness in a first direction, and comprises a crumple energy absorption plate and an intrusion resistance plate which are laminated; the crumple energy absorption plate comprises an upper supporting plate and a lower supporting plate, and the upper supporting plate and the lower supporting plate are arranged in a stacked mode in the first direction and jointly define an energy absorption cavity. The invasion resisting plate is connected to the side, back on to the energy absorption cavity, of the lower supporting plate, and the yield strength of the invasion resisting plate is larger than that of the collapsing energy absorption plate. According to the bottom protection plate, the capacity of resisting external invasion is guaranteed, materials are reduced, and the weight and the cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a bottom protection plate, a battery pack, and an electrical device. Background Technology

[0002] Battery packs in related technologies often fail bottom ball impact tests due to low yield strength of the bottom structure or poor material properties. Therefore, it is necessary to set up an additional bottom protection plate with high yield strength to improve the safety of the bottom of the battery pack. This will ensure that the battery pack is protected from external intrusion when facing splashes of stones, mud, sand, etc. in the daily environment, as well as when the bottom is supported or scraped.

[0003] In related technologies, to improve the resistance to intrusion of the bottom protection plate of the battery pack, the thickness of the bottom protection plate is generally increased. This results in more material used in the bottom protection plate, significantly increased cost, and a substantial increase in weight, which reduces the energy density of the battery pack and leads to poor range. Utility Model Content

[0004] In view of this, the present invention provides a bottom protection plate, a battery pack, and an electrical device to solve the problem of increasing the resistance to intrusion by increasing the thickness of the bottom protection plate.

[0005] In a first aspect, the present invention provides a bottom protective plate having a thickness in a first direction, comprising: a collapsible energy-absorbing plate and an intrusion-resistant plate stacked together; wherein, the collapsible energy-absorbing plate includes an upper support plate and a lower support plate, the upper support plate and the lower support plate being stacked along the first direction and jointly defining an energy-absorbing cavity; the intrusion-resistant plate is connected to the side of the lower support plate opposite to the energy-absorbing cavity, and the yield strength of the intrusion-resistant plate is greater than the yield strength of the collapsible energy-absorbing plate.

[0006] Beneficial effects: The intrusion resistance plate significantly enhances the structural yield strength of the bottom protection plate, while the collapsible energy-absorbing plate deforms to absorb and buffer external impacts. Specifically, when the bottom protection plate encounters an external intrusion with small momentum, the intrusion resistance plate resists it with minimal or no deformation, preventing stress on the collapsible energy-absorbing plate and thus protecting it and extending its lifespan. When the bottom protection plate encounters an external intrusion with large momentum, the intrusion resistance plate cannot completely offset the impact. First, the intrusion resistance plate deforms significantly to absorb some of the impact force, and then the collapsible energy-absorbing plate deforms under stress to absorb the remaining impact force, effectively preventing cell damage. In this way, by absorbing and buffering external impacts through the deformation of the collapsible energy-absorbing plate, there is no need to increase the thickness of the bottom protection plate, reducing material usage, lowering the cost and weight of the bottom protection plate, increasing the energy density of the battery pack, and extending its driving range.

[0007] In one optional embodiment, the bottom guard plate further has dimensions in a second direction and a third direction, wherein the first direction, the second direction and the third direction intersect each other, and a plurality of first support ribs are connected between the upper support plate and the lower support plate, wherein the plurality of first support ribs are spaced apart along the second direction in the transverse direction and the first support ribs extend along the third direction in the longitudinal direction.

[0008] Beneficial effects: When the collapsible energy-absorbing plate is compressed by external force, the first support rib can deform, which plays a role in buffering and absorbing energy, reducing the external force transmitted to the battery cell, and reducing the probability of the battery cell being damaged by force.

[0009] In one alternative embodiment, the first support rib includes a first inclined section, which is inclined relative to the upper support plate and the lower support plate.

[0010] Beneficial effects: Since the first support rib includes the first inclined section, the size of the first support rib along the first direction can be set to be larger, and the size that the first support rib can deform also increases accordingly, which can absorb more energy, further reduce the external force transmitted to the battery cell, and more effectively avoid damage to the battery cell.

[0011] In one optional embodiment, the first support rib further includes a first vertical segment and a second vertical segment, both of which extend along the first direction, and the first inclined segment connects the first vertical segment and the second vertical segment.

[0012] Beneficial effects: It helps the first supporting rib to deform and absorb energy in the first inclined section, ensuring that the energy absorption position is roughly on the same horizontal plane.

[0013] In one alternative embodiment, a plurality of second support ribs are connected between the upper support plate and the lower support plate, wherein the plurality of second support ribs and the plurality of first support ribs are alternately arranged along the second direction in the transverse direction, and the second support ribs extend along the third direction in the longitudinal direction.

[0014] Beneficial effects: When the collapsible energy-absorbing plate is compressed by external force, the second support rib can deform, which plays a role in buffering and absorbing energy, reducing the external force transmitted to the battery cell, and reducing the probability of the battery cell being damaged by force.

[0015] In one optional embodiment, the second support rib includes a second inclined segment, which is inclined relative to the upper support plate and the lower support plate, and the first inclined segment and the second inclined segment are arranged opposite to each other.

[0016] Beneficial effects: Since the second support rib includes a second inclined section, the size of the second support rib along the first direction can be set to be larger, and the size that the second support rib can deform also increases accordingly, which can absorb more energy, further reduce the external force transmitted to the battery cell, and more effectively avoid damage to the battery cell due to force.

[0017] In one optional embodiment, the second support rib further includes a third vertical segment and a fourth vertical segment, both of which extend along the first direction, and the second inclined segment connects the third vertical segment and the fourth vertical segment.

[0018] Beneficial effects: It facilitates the deformation and energy absorption of the second supporting rib in the second inclined section, ensuring that the energy absorption position is approximately on the same horizontal plane.

[0019] Secondly, this utility model also provides a battery pack, comprising: a frame having a cell cavity extending through the frame along a first direction; a top cover connected to one side of the frame along the first direction and covering the cell cavity; a bottom protective plate as described in the first aspect, connected to the other side of the frame along the first direction and covering the cell cavity; and a cell disposed within the cell cavity.

[0020] Beneficial effects: The battery pack of this utility model, by utilizing the bottom protective plate described in the first aspect, can increase its resistance to external intrusion and help reduce the probability of cell damage.

[0021] In one alternative embodiment, an airbag is provided inside the energy absorption cavity; the battery pack further includes a pressure sensor, at least a portion of the energy absorption cavity penetrates the bottom protective plate, the frame and the bottom protective plate define a receiving cavity, the receiving cavity is in communication with the energy absorption cavity, and the pressure sensor is located inside the receiving cavity.

[0022] Beneficial effects: It can monitor the air pressure in the containment cavity in real time. The pressure sensor can be connected to the vehicle's controller to provide feedback on the pressure status.

[0023] In one optional embodiment, the frame further includes: a reinforcing beam disposed on the side of the frame facing away from the cell cavity, the side of the reinforcing beam facing the bottom protective plate being constructed as an inclined surface, the inclined surface being gradually inclined upward in the direction away from the frame, the anti-intrusion plate including a flat plate and an inclined plate, the flat plate being connected to the collapsible energy-absorbing plate, the inclined plate being inclined relative to the flat plate, and the inclined plate being connected to the inclined surface.

[0024] Beneficial effects: The connection between the anti-intrusion plate and the reinforcing beam via the inclined section and inclined surface increases the contact area between the anti-intrusion plate and the reinforcing beam, thereby improving the connection strength between the frame and the bottom liner and helping to ensure the relative positional stability between the frame and the bottom liner. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram showing the connection of the battery cell, frame, and bottom protective plate according to an embodiment of the present utility model;

[0027] Figure 2 This is an exploded view of the battery cell, frame, and bottom protective plate according to an embodiment of the present utility model;

[0028] Figure 3 This is a cross-sectional view of the battery cell, frame, and bottom protective plate according to an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 A magnified view of a portion of region A in the middle;

[0030] Figure 5 This is a schematic diagram of the structure of the collapsible energy-absorbing plate according to an embodiment of the present utility model;

[0031] Figure 6 for Figure 5 A magnified view of a portion of region B in the middle;

[0032] Figure 7 for Figure 6 A magnified view of a portion of region C in the middle;

[0033] Figure 8 This is a schematic diagram of the anti-intrusion plate according to an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the framework of an embodiment of the present utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Bottom protection plate; 2. Battery pack;

[0037] 100. Collapsible energy-absorbing plate; 101. Energy-absorbing cavity; 102. Sub-cavity; 103. Layer cavity; 110. Upper support plate; 120. Lower support plate; 121. Main section; 122. Extension section; 130. First support rib; 131. First inclined section; 132. First vertical section; 133. Second vertical section; 140. Second support rib; 141. Second inclined section; 142. Third vertical section; 143. Fourth vertical section;

[0038] 200. Intrusion-resistant plate; 210. Flat plate; 220. Inclined plate;

[0039] 400, Frame; 401, Cell cavity; 410, Main body; 420, Extension plate; 430, Reinforcing beam; 431, Inclined surface; 440, Receiving cavity;

[0040] 600, battery cell; 700, pressure sensor;

[0041] Z, first direction; X, second direction; Y, third direction. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] In the description of this utility model, "a plurality of" means two or more. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention.

[0047] According to an embodiment of the present invention, a bottom protective plate 1 is provided, the bottom protective plate 1 having a thickness in a first direction Z, the bottom protective plate 1 including a collapsible energy-absorbing plate 100 and an intrusion-resistant plate 200 stacked together.

[0048] The collapsible energy-absorbing plate 100 includes an upper support plate 110 and a lower support plate 120. The upper support plate 110 and the lower support plate 120 are stacked along the first direction Z and together define the energy-absorbing cavity 101. That is, the upper support plate 110 and the lower support plate 120 can be arranged in parallel. The side of the upper support plate 110 facing away from the energy-absorbing cavity 101 is used to support the battery cell 600. An intrusion-resistant plate 200 is connected to the side of the lower support plate 120 facing away from the energy-absorbing cavity 101. The yield strength of the intrusion-resistant plate 200 is greater than the yield strength of the collapsible energy-absorbing plate 100.

[0049] Furthermore, the bottom guard plate 1 also includes an airbag (not shown in the figure), which is located in the energy absorption cavity 101 and is connected to the upper support plate 110 and the lower support plate 120.

[0050] The airbag can directly or indirectly contact the upper support plate 110 and the lower support plate 120. The upper support plate 110 and the lower support plate 120 can transmit force through the airbag, that is, the airbag is located between the upper support plate 110 and the lower support plate 120 along the first direction Z.

[0051] For example, the uninflated airbag can be placed in the energy absorption chamber 101 first, and then the airbag can be inflated to improve assembly efficiency.

[0052] The anti-intrusion plate 200 can be formed by stamping high-yield-strength hot-formed steel, and has a high yield strength. The anti-intrusion plate 200 can greatly enhance the structural yield strength of the bottom guard plate 1. The collapsible energy-absorbing plate 100 can not only accommodate the airbag and increase the installation space for the airbag, but also deform to absorb and buffer external impacts. The airbag can undergo elastic deformation, which not only absorbs and buffers external impacts, but also has elastic force after deformation, which can play a role in rebounding impact force.

[0053] Specifically, when the bottom guard plate 1 encounters an external intrusion with a small momentum, the intrusion-resistant plate 200 can resist the external intrusion. The deformation of the intrusion-resistant plate 200 is small or almost non-deformed, which avoids the collapse energy-absorbing plate 100 from being stressed, thus protecting the collapse energy-absorbing plate 100 and extending the service life of the collapse energy-absorbing plate 100 and the airbag.

[0054] When the bottom protective plate 1 encounters an external intrusion with a large momentum, the intrusion-resistant plate 200 cannot completely offset the external intrusion. First, the intrusion-resistant plate 200 undergoes a large-scale deformation to absorb part of the impact force. Then, the collapsible energy-absorbing plate 100 deforms under force to absorb another part of the impact force. Finally, the airbag elastically deforms to absorb a part of the impact energy. After deformation, the airbag has elasticity and can rebound to offset another part of the impact force. Since the airbag is filled with high-pressure gas, the deformation process of the airbag can absorb more energy. When subjected to the same energy impact, compared with the bottom protective plate of the battery pack in the related technology, the bottom protective plate 1 of this utility model embodiment has a smaller degree of deformation and a faster deformation and rebound process, which can effectively slow down the intrusion rate, thereby effectively preventing the battery cell 600 from being damaged and improving the safety and stability of the battery pack 2.

[0055] In this way, the external impact is absorbed and buffered by the deformation of the airbag and the collapsible energy-absorbing plate 100, without increasing the thickness of the bottom protection plate 1. This reduces the amount of material used, lowers the cost and weight of the bottom protection plate 1, and increases the energy density of the battery pack 2, thus extending the driving range.

[0056] In addition, after the bottom guard plate 1 is subjected to external intrusion, during subsequent maintenance, the condition and safety of the battery pack 2 can be assessed based on the damage to the airbag and the deformation of the collapsible energy-absorbing plate 100.

[0057] In addition, the airbag can also bear weight, thereby increasing the number of cells 600 that can be placed in the battery pack 2, thus improving the energy density of the battery pack 2 and extending its range.

[0058] like Figure 6 and Figure 7 As shown, in the technical solution of this embodiment, the bottom guard plate 1 also has dimensions in the second direction X and the third direction Y. The first direction Z, the second direction X and the third direction Y can intersect each other, for example, the first direction Z, the second direction X and the third direction Y can be set perpendicular to each other.

[0059] The collapsible energy-absorbing plate 100 also includes a plurality of first support ribs 130, which connect the upper support plate 110 and the lower support plate 120. The plurality of first support ribs 130 are spaced apart in the transverse direction along a second direction X, and extend in the longitudinal direction along a third direction Y. The plurality of first support ribs 130 divide the energy-absorbing cavity 101 into a plurality of sub-cavities 102, each of which contains at least one airbag. Each first support rib 130 includes a first inclined section 131, which is inclined relative to the upper support plate 110 and the lower support plate 120. The first inclined section 131 can be a straight section or a curved section.

[0060] By setting multiple first support ribs 130, when the collapsible energy-absorbing plate 100 is compressed by external force, the first support ribs 130 can deform, playing a buffering and energy-absorbing role, reducing the external force transmitted to the battery cell 600 (wherein, the first support ribs 130 can completely absorb energy, meaning the external force will not be transmitted to the battery cell 600, and the first support ribs 130 can also partially absorb energy), thus reducing the probability of the battery cell 600 being damaged by force. Furthermore, it can increase the number of airbags, thereby improving the overall absorption capacity of the airbags.

[0061] Since the first support rib 130 includes the first inclined section 131, the size of the first support rib 130 along the third direction Y can be set to be larger, and the deformable size of the first support rib 130 is also increased accordingly, which can absorb more energy, further reduce the external force transmitted to the battery cell 600, and more effectively avoid damage to the battery cell 600 due to force.

[0062] like Figure 6 and Figure 7 As shown, in the technical solution of this embodiment, the collapsible energy-absorbing plate 100 further includes a plurality of second support ribs 140. The second support ribs 140 are connected between the upper support plate 110 and the lower support plate 120. The plurality of second support ribs 140 and the plurality of first support ribs 130 are alternately arranged in the transverse direction along the second direction X, and the second support ribs 140 extend in the longitudinal direction along the third direction Y.

[0063] In other words, each second support rib 140 is located within a sub-cavity 102, and the second support rib 140 divides its sub-cavity 102 into two layered cavities 103, each layered cavity 103 containing at least one airbag. The second support rib 140 includes a second inclined section 141, which is inclined relative to the upper support plate 110 and the lower support plate 120. A first inclined section 131 and the second inclined section 141 are positioned opposite each other. The second inclined section 141 can be a straight line or a curved section.

[0064] By setting multiple second support ribs 140, when the collapsible energy-absorbing plate 100 is compressed by external force, the second support ribs 140 can deform, playing a buffering and energy-absorbing role, reducing the external force transmitted to the battery cell 600 (wherein, the first support rib 130 and the second support rib 140 can completely absorb energy, that is, the external force will not be transmitted to the battery cell 600, and the first support rib 130 and the second support rib 140 can also partially absorb energy), thus reducing the probability of the battery cell 600 being damaged by force. Furthermore, it can increase the number of airbags, thereby improving the overall absorption capacity of the airbags.

[0065] Since the second support rib 140 includes the second inclined section 141, the size of the second support rib 140 along the third direction Y can be set to be larger, and the size that the second support rib 140 can deform also increases accordingly, which can absorb more energy, further reduce the external force transmitted to the battery cell 600, and more effectively avoid damage to the battery cell 600 due to force.

[0066] In addition, the first inclined section 131 and the second inclined section 141 are arranged opposite to each other, and the deformation direction of the first inclined section 131 and the deformation direction of the second inclined section 141 are different. This can improve the ability of the collapsible energy-absorbing plate 100 to resist external forces and prevent the collapsible energy-absorbing plate 100 from deforming quickly when subjected to small forces.

[0067] Of the two cavities 103, one is mainly located on the upper side of the second support rib 140, and the other is mainly located on the lower side of the second support rib 140. The width of the cross-section of the cavity 103 located on the upper side of the second support rib 140 gradually increases from bottom to top, while the width of the cross-section of the cavity 103 located on the lower side of the second support rib 140 gradually decreases from bottom to top.

[0068] like Figure 6 and Figure 7 As shown, in the technical solution of this embodiment, the first support rib 130 further includes a first vertical segment 132 and a second vertical segment 133, both extending along the first direction Z. A first inclined segment 131 connects to the first vertical segment 132 and the second vertical segment 133 on opposite sides along the first direction Z. The second support rib 140 further includes a third vertical segment 142 and a fourth vertical segment 143, both extending along the first direction Z. A second inclined segment 141 connects to the third vertical segment 142 and the fourth vertical segment 143 on opposite sides along the first direction Z. The third vertical segment 142 of each second support rib 140 is connected to the first vertical segment 132 of an adjacent first support rib 130, and the fourth vertical segment 143 of the second support rib 140 is connected to the second vertical segment 133 of another adjacent first support rib 130.

[0069] The dimensions of the first vertical segment 132 and the third vertical segment 142 can be the same, and the dimensions of the second vertical segment 133 and the fourth vertical segment 143 can be the same.

[0070] In this way, when the first support rib 130 is subjected to force, it mainly deforms from the middle of the first inclined section 131 along the first direction Z. When the second support rib 140 is subjected to force, it mainly deforms from the middle of the second inclined section 141 along the first direction Z. The deformation heights of the first support rib 130 and the second support rib 140 are approximately the same, which can improve the consistency of the deformation of the first support rib 130 and the second support rib 140, thereby improving the uniformity of the stress on the collapsible energy-absorbing plate 100, avoiding uneven stress on the collapsible energy-absorbing plate 100, and improving the energy absorption effect of the bottom protective plate 1.

[0071] In addition, the first support rib 130, the second support rib 140 and the upper support plate 110 are connected at the same point, and the first support rib 130, the second support rib 140 and the lower support plate 120 are connected at the same point, which is beneficial to improving the structural yield strength of the collapse energy absorption plate 100.

[0072] The energy-absorbing cavity 101 can penetrate the opposite sides of the collapsible energy-absorbing plate 100 along the third direction Y. The collapsible energy-absorbing plate 100 can be constructed by extrusion molding, which improves the structural yield strength of the collapsible energy-absorbing plate 100 and makes the production of the collapsible energy-absorbing plate 100 more convenient and improves production efficiency.

[0073] Furthermore, there can be multiple collapsible energy-absorbing plates 100, which are arranged along the second direction X. Adjacent collapsible energy-absorbing plates 100 can be welded together. For example, the upper support plates 110 of two adjacent collapsible energy-absorbing plates 100 can be welded together, and the second vertical segments 133 and the fourth vertical segments 143 of two adjacent collapsible energy-absorbing plates 100 can be welded together; or the lower support plates 120 of two adjacent collapsible energy-absorbing plates 100 can be welded together, and the first vertical segments 132 and the third vertical segments 142 of two adjacent collapsible energy-absorbing plates 100 can be welded together.

[0074] According to an embodiment of the present invention, another aspect also provides a battery pack 2, such as... Figure 1 and Figure 2 As shown, the battery pack 2 includes a frame 400, a top cover (not shown in the figure), and the aforementioned bottom protective plate 1.

[0075] The frame 400 has a cell cavity 401 that extends through the frame 400 along the first direction Z. The upper cover is connected to one side of the frame 400 along the first direction Z and covers the cell cavity 401. The bottom protective plate 1 is connected to the other side of the frame 400 along the first direction Z and covers the cell cavity 401. The cell 600 is disposed within the cell cavity 401. In other words, the upper cover, frame 400, and bottom protective plate 1 are stacked along the first direction Z, and together they enclose the cell cavity 401 to protect the cell 600.

[0076] For example, the frame 400 can be made of aluminum profile. There can be multiple battery cells 600, and multiple battery cells 600 are supported on the bottom protective plate 1.

[0077] The battery pack 2 of this utility model, by utilizing the aforementioned bottom protective plate 1, can increase its resistance to external intrusion and help reduce the probability of damage to the battery cell 600.

[0078] like Figure 3 , Figure 4 and Figure 6 As shown, in the technical solution of this embodiment, the battery pack 2 also includes a pressure sensor 700. The frame 400 and the bottom protective plate 1 define a receiving cavity 440. The pressure sensor 700 is located in the receiving cavity 440. The pressure sensor 700 is installed on the bottom protective plate 1, or the pressure sensor 700 is installed on the frame 400, or the pressure sensor 700 is installed on both the bottom protective plate 1 and the frame 400. The energy absorption cavity 101 extends through the bottom protective plate 1 along its extension direction, that is, at least a part of the energy absorption cavity 101 extends through the bottom protective plate 1. The energy absorption cavity 101 is connected to the receiving cavity 440. The pressure sensor 700 is used to detect the air pressure in the receiving cavity 440.

[0079] For example, the receiving cavity 440 may be equipped with multiple pressure sensors 700, which are spaced apart along the extending direction of the receiving cavity 440 to form multi-point detection of the air pressure inside the receiving cavity 440. Furthermore, there may be two receiving cavities 440, with the energy-absorbing cavity 101 penetrating through the opposite sides of the bottom protective plate 1, and each side of the energy-absorbing cavity 101 communicating with one receiving cavity 440.

[0080] By incorporating a pressure sensor 700, the air pressure within the containment cavity 440 can be monitored in real time. The pressure sensor 700 can be connected to the vehicle's controller to provide feedback. When the airbag ruptures, the gas inside the airbag diffuses along the energy-absorbing cavity 101 into the containment cavity 440, increasing the air pressure. The pressure sensor 700 then feeds the detected pressure signal back to the controller. The controller can then activate the horn, buzzer, display screen, and indicator lights to emit sound and light warnings, alerting the user and allowing them to be aware of the real-time situation and relocate to the installation area, thus preventing injury and improving safety.

[0081] like Figure 4 As shown, in the technical solution of this embodiment, the lower support plate 120 includes a main section 121 and an extension section 122. The extension section 122 is connected to the main section 121 and arranged along the extension direction of the energy absorption cavity 101. The extension section 122 extends beyond the energy absorption cavity 101. The frame includes a main body 410 and an extension plate 420. The collapsible energy absorption plate 100 and the upper cover are connected to opposite sides of the main body 410. The extension plate 420 is connected to the side of the main body 410 facing the bottom protective plate 1. The extension plate 420 is connected to the extension section 122. The extension section 122, the extension plate 420, the side of the main body 410 facing the bottom protective plate 1, and the side of the collapsible energy absorption plate 100 facing the extension plate 420 together define the receiving cavity 440.

[0082] Among them, the collapsible energy-absorbing plate 100 and the main body 410 can be sealed by adhesive, the extension section 122 and the extension plate 420 can be sealed by adhesive, the main section 121 and the extension section 122 can be integrally formed, and the main body 410 and the extension plate 420 can be integrally formed. This can improve the sealing effect of the receiving cavity 440, prevent gas from leaking from the receiving cavity 440 when the airbag is damaged, and improve the accuracy of the pressure sensor 700 in detecting the structure.

[0083] In this way, the receiving cavity 440 can be defined by the collapsible energy-absorbing plate 100 and the frame 400, which makes the structure simpler and the sealing effect better.

[0084] like Figure 4 As shown, in this embodiment, the pressure sensor 700 is installed on the side of the extension section 122 facing the mounting body 410. Typically, the extension section 122 is located below the pressure sensor 700. By installing the pressure sensor 700 on the extension section 122, it is possible to ensure that the pressure sensor 700 is sufficiently close to the energy absorption cavity 101, which is beneficial for improving the timeliness of pressure detection by the pressure sensor 700. Furthermore, under the influence of gravity, the pressure sensor 700 can adhere tightly to the extension section 122, improving the reliability of the positioning between the pressure sensor 700 and the extension section 122.

[0085] Furthermore, the pressure sensor 700 and the extension section 122 can be pre-installed together. The pressure sensor 700 and the extension section 122 can be bonded together with structural adhesive and then installed together on the frame 400. When the bottom plate is fixed to the frame 400, the positioning between the pressure sensor 700 and the frame 400 can be achieved, improving the ease of installation.

[0086] like Figure 3 , Figure 4 , Figure 8 and Figure 9As shown, in the technical solution of this embodiment, the frame 400 also includes a reinforcing beam 430. The reinforcing beam 430 is located on the side of the main body 410 away from the cell cavity 401. The side of the reinforcing beam 430 facing the bottom protective plate 1 is constructed as an inclined surface 431. The inclined surface 431 is gradually inclined upward in the direction away from the main body 410. The anti-intrusion plate 200 includes a flat plate 210 and an inclined plate 220. The flat plate 210 is connected to the collapsible energy-absorbing plate 100. The inclined plate 220 is inclined relative to the flat plate and is connected to the inclined surface 431.

[0087] By setting up the reinforcing beam 430, the structural yield strength of the frame can be improved, thereby increasing the structural yield strength of the battery pack 2 and reducing the probability of damage to the battery pack 2.

[0088] The anti-intrusion plate 200 and the reinforcing beam 430 are connected by an inclined plate 220 and an inclined surface 431, which increases the contact area between the anti-intrusion plate 200 and the reinforcing beam 430, thereby improving the connection strength between the frame 400 and the bottom protective plate 1, which is beneficial to ensuring the relative positional stability between the frame 400 and the bottom protective plate 1.

[0089] The inclined plate 220 and the inclined surface 431 can be fixed with bolts to achieve the pre-positioning of the frame 400 and the bottom protective plate 1. Then, sealant is injected between the inclined plate 220 and the inclined surface 431 to improve the sealing effect between the frame 400 and the bottom protective plate 1, prevent gas from leaking between the frame 400 and the bottom protective plate 1 when the airbag ruptures, and improve the reliability of the pressure sensor 700 detection structure.

[0090] The following example illustrates the operating state of the bottom protection plate 1 when the battery pack 2 encounters external intrusion:

[0091] Firstly, when the momentum of the external intrusion is small, for example, less than 125 kJ, the anti-intrusion plate 200 can directly block or change the direction of the object's movement by rebounding, thus protecting the structure of the battery pack 2.

[0092] The second scenario is when the momentum of the external intrusion is slightly larger, for example, when the momentum of the external intrusion is less than 200 kJ and the local pressure is less than 800 MPa, the anti-intrusion plate 200 cannot completely block the external intrusion. The anti-intrusion plate 200 undergoes large deformation or is torn. The deformation of the anti-intrusion plate absorbs some of the energy, and the external kinetic energy is transferred to the collapse energy-absorbing plate 100. The lower support plate 120 moves towards the upper support plate 110, and the first support rib 130 and the second support rib 140 deform to absorb some of the impact energy. The airbag will also deform passively.

[0093] Thirdly, when the momentum of the external intrusion is greater, the anti-intrusion plate 200 cannot completely block the external intrusion. The anti-intrusion plate 200 undergoes significant deformation or is torn. The deformation of the anti-intrusion plate absorbs some energy, and the external kinetic energy is transferred to the collapse energy-absorbing plate 100. The lower support plate 120 moves towards the upper support plate 110, and the first support rib 130 and the second support rib 140 deform to absorb some of the impact energy. The airbag will also deform passively until the deformation of the airbag reaches its limit and ruptures. The pressure sensor 700 senses the sudden change in pressure in the containment cavity 440 and sends an emergency signal to the vehicle controller. At the same time, the collapse energy-absorbing plate 100 continues to deform until it is locally compressed into a solid state or close to a solid state. At this time, the limit of the collapse energy absorption of the bottom guard plate 1 is reached. If there is still external impact energy that has not been offset and absorbed, the remaining energy will invade the battery cell 600 compartment.

[0094] The air pressure inside the airbag can be 400 MPa. When the pressure on the airbag reaches 1000 MPa, the airbag can rupture. When a metal ball with a diameter of 150 mm is used, and the metal ball is made of 45# steel, and the metal ball presses against the bottom guard plate 1 at a speed of 1 mm / s, and the pressing force reaches 20 KN or other set values, the bottom guard plate 1 can be placed in the third working state described above.

[0095] According to an embodiment of the present invention, in a third aspect, an electrical device is also provided, including the aforementioned battery pack 2. The electrical device may be a vehicle or an energy storage device, etc.

[0096] The electrical equipment of this invention, by utilizing the aforementioned battery pack 2, can increase its resistance to external intrusion and help reduce the probability of damage to the battery cell 600.

[0097] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A bottom guard plate having a thickness in a first direction (Z), characterized in that, include: A collapsed energy-absorbing plate (100) and an intrusion-resistant plate (200) are stacked together; wherein, The collapsible energy-absorbing plate (100) includes an upper support plate (110) and a lower support plate (120), the upper support plate (110) and the lower support plate (120) are stacked along the first direction (Z) and together define an energy-absorbing cavity (101); The anti-intrusion plate (200) is connected to the side of the lower support plate (120) facing away from the energy absorption cavity (101), and the yield strength of the anti-intrusion plate (200) is greater than the yield strength of the collapse energy absorption plate (100).

2. The bottom guard plate according to claim 1, further comprising dimensions in a second direction (X) and a third direction (Y), wherein, The first direction (Z), the second direction (X), and the third direction (Y) intersect each other pairwise, characterized in that... A plurality of first support ribs (130) are connected between the upper support plate (110) and the lower support plate (120), wherein the plurality of first support ribs (130) are spaced apart in the second direction (X) in the transverse direction and the first support ribs (130) extend in the third direction (Y) in the longitudinal direction.

3. The bottom protective plate according to claim 2, characterized in that, The first support rib (130) includes a first inclined section (131), which is inclined relative to the upper support plate (110) and the lower support plate (120).

4. The bottom protective plate according to claim 3, characterized in that, The first support rib (130) further includes a first vertical segment (132) and a second vertical segment (133), both of which extend along the first direction (Z), and the first inclined segment (131) connects the first vertical segment (132) and the second vertical segment (133).

5. The bottom protective plate according to claim 3, characterized in that, A plurality of second support ribs (140) are connected between the upper support plate (110) and the lower support plate (120), wherein, in the transverse direction, a plurality of second support ribs (140) and a plurality of first support ribs (130) are alternately arranged along the second direction (X), and the second support ribs (140) extend in the longitudinal direction along the third direction (Y).

6. The bottom protective plate according to claim 5, characterized in that, The second support rib (140) includes a second inclined section (141), which is inclined relative to the upper support plate (110) and the lower support plate (120), and the first inclined section (131) and the second inclined section (141) are arranged opposite to each other.

7. The bottom protective plate according to claim 6, characterized in that, The second support rib (140) further includes a third vertical segment (142) and a fourth vertical segment (143), both of which extend along the first direction (Z), and the second inclined segment (141) connects the third vertical segment (142) and the fourth vertical segment (143).

8. A battery pack, characterized in that, include: A frame (400) is provided with a cell cavity (401), the cell cavity (401) passing through the frame (400) along the first direction (Z); The top cover is connected to one side of the frame (400) along the first direction (Z) and covers the cell cavity (401); The bottom protective plate (1) according to any one of claims 1-7 is connected to the frame (400) on the other side along the first direction (Z) and covers the cell cavity (401); The battery cell (600) is disposed within the battery cell cavity (401).

9. The battery pack according to claim 8, characterized in that, An airbag is provided inside the energy-absorbing cavity (101); The battery pack includes a pressure sensor (700), at least a portion of the energy absorption cavity (101) extends through the bottom protective plate (1), the frame (400) and the bottom protective plate (1) define a receiving cavity (440) that communicates with the energy absorption cavity (101), and the pressure sensor (700) is located within the receiving cavity (440).

10. The battery pack according to claim 8, characterized in that, The frame (400) also includes: A reinforcing beam (430) is provided on the side of the frame (400) facing away from the cell cavity (401). The side of the reinforcing beam (430) facing the bottom protective plate (1) is constructed as an inclined surface (431). The inclined surface (431) is gradually inclined upward in the direction away from the frame (400). The anti-intrusion plate (200) includes a flat plate (210) and an inclined plate (220). The flat plate (210) is connected to the collapsible energy-absorbing plate (100). The inclined plate (220) is inclined relative to the flat plate (210). The inclined plate (220) is connected to the inclined surface (431).

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