Protective structure, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a protection structure, a battery pack and electric equipment. The protection structure is used for protecting a battery cell, the protection structure comprises a second protection plate and a first protection plate which are stacked in sequence, the second protection plate is connected to the first protection plate, and the second protection plate is arranged on one side, far away from the battery cell, of the protection structure; at least one containing cavity is formed in the second protection plate, and the containing cavity is filled with non-Newtonian fluid.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a protective structure, a battery pack and electrical equipment. Background Art

[0002] The battery pack includes a battery cell and a protective plate. The protective plate is arranged on the outside of the battery cell to protect the battery cell through the protective plate to ensure the safety of the battery pack.

[0003] The protective plate in the prior art generally includes an upper plate, a lower plate and a buffer cavity disposed between the upper plate and the lower plate. Through the cooperation of the upper plate, the lower plate and the buffer cavity, the protective plate can absorb more collision energy, thereby further improving the safety of the battery pack.

[0004] However, when the battery pack is subjected to a strong impact, the existing protective plate can easily fail, causing serious threats to the safety of the battery cells. Utility Model Content

[0005] The utility model discloses a protective structure, a battery pack and an electrical device, so as to solve or at least partially solve the problem existing in the prior art that when the battery pack is subjected to a strong impact, the protective plate fails and the safety of the battery cell is threatened.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In the first aspect, the utility model discloses a protective structure, which is used for protecting battery cells. The protective structure includes: a second protective plate and a first protective plate stacked in sequence, the second protective plate is connected to the first protective plate, and the second protective plate is arranged on a side of the protective structure away from the battery cell; at least one accommodating cavity is arranged in the second protective plate, and the accommodating cavity is filled with a non-Newtonian fluid.

[0008] Optionally, the accommodating cavities include a plurality of accommodating cavities, and the plurality of accommodating cavities are arranged at intervals in the second protective plate.

[0009] Optionally, along the first direction, a plurality of the accommodating cavities are spaced apart in the second protective plate, and along the second direction, the accommodating cavities penetrate the second protective plate; wherein, the first direction is perpendicular to the thickness direction of the protective structure, and the second direction is perpendicular to the first direction and the thickness direction of the protective structure.

[0010] Optionally, the non-Newtonian fluid comprises a shear thickening viscous glue.

[0011] Optionally, the first protective plate includes a first plate body and a second plate body, and the first plate body and the second plate body are spaced apart along the thickness direction of the protective structure; the first protective plate also includes a buffer cavity, and the buffer cavity is arranged between the first plate body and the second plate body.

[0012] Optionally, the buffer cavity includes a first buffer cavity and a second buffer cavity, the first buffer cavity is connected to the first plate body, and the second buffer cavity is connected to the second plate body.

[0013] Optionally, the first buffer cavity and the second buffer cavity each include a plurality, wherein the plurality of the first buffer cavities are arranged at intervals, and the plurality of the second buffer cavities are also arranged at intervals.

[0014] Optionally, along a first direction, a plurality of the first buffer cavities and a plurality of the second buffer cavities are alternately arranged; wherein the first direction is perpendicular to a thickness direction of the protective structure.

[0015] Optionally, along the first direction, the cross-section of the first buffer cavity is a first trapezoid, and the length of the base of the first trapezoid close to the first plate body is greater than the length of the base of the first trapezoid away from the first plate body; along the first direction, the cross-section of the second buffer cavity is also a second trapezoid, and the length of the base of the second trapezoid close to the second plate body is greater than the length of the base of the second trapezoid away from the second plate body.

[0016] Optionally, along a second direction, the first buffer cavity and the second buffer cavity penetrate the first protective plate; wherein the second direction is perpendicular to the first direction and the thickness direction of the protective structure.

[0017] In a second aspect, the utility model discloses a battery pack, comprising a battery cell and the protective structure described in the first aspect, wherein the first protective plate is arranged on a side of the protective structure close to the battery cell.

[0018] In a third aspect, the utility model discloses an electrical device, including an electrical device and the battery pack described in the second aspect, wherein the battery pack is connected to the electrical device.

[0019] The utility model discloses a protective structure, a battery pack and an electrical device, wherein the protective structure is used for protecting a battery cell, and the protective structure comprises: a second protective plate and a first protective plate stacked in sequence, the second protective plate is connected to the first protective plate, and the second protective plate is arranged on the side of the protective structure away from the battery cell; at least one accommodating cavity is arranged in the second protective plate, and the accommodating cavity is filled with a non-Newtonian fluid. When the protective structure in the utility model is arranged on the outside of the battery cell, the battery cell can be protected by the first protective plate and the second protective plate of the protective structure together, and the protective ability of the protective structure is stronger, and the battery cell is safer. Further, in the utility model, the first protective plate of the protective structure is arranged on the side close to the battery cell, and the second protective plate is arranged on the side away from the battery cell, and the second protective plate is arranged in the second protective plate. The accommodating cavity is filled with a non-Newtonian fluid, so that the impact resistance of the second protective plate is stronger. When the battery pack is subjected to a relatively strong impact, the second protective plate can better protect the battery cell, avoid the failure of the protective structure, and cause the safety of the battery cell to be threatened. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram showing the structure of the first protective plate in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram showing the structure of the second protective plate in an embodiment of the utility model;

[0022] Figure 3 A schematic diagram showing the structure of the protective structure in the embodiment of the utility model;

[0023] Figure 4 A cross-sectional view of the battery pack along a first direction in an embodiment of the utility model is shown;

[0024] Figure 5 A cross-sectional view of the battery pack along the second direction in an embodiment of the utility model;

[0025] Figure 6 An exploded view of the battery pack described in the embodiment of the present utility model is shown.

[0026] Reference numerals:

[0027] 10: first protective plate; 11: first plate body; 12: second plate body; 13: first buffer cavity; 14: second buffer cavity;

[0028] 20: second protective plate; 21: accommodating chamber;

[0029] 30: battery cell;

[0030] 40: tray bottom plate;

[0031] 50: cooling plate;

[0032] 60: Thermal conductive adhesive;

[0033] A: first direction; B: second direction. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0036] Reference Figure 1 , showing a schematic diagram of the structure of the first protective plate in an embodiment of the utility model; referring to Figure 2 , showing a schematic diagram of the structure of the second protective plate in an embodiment of the utility model; referring to Figure 3 , showing a schematic diagram of the structure of the protective structure in the embodiment of the utility model; referring to Figure 4 , showing a cross-sectional view of the battery pack along the first direction in an embodiment of the utility model; referring to Figure 5 , showing a cross-sectional view of the battery pack along the second direction in an embodiment of the utility model; referring to Figure 6 , showing an exploded view of the battery pack described in an embodiment of the utility model.

[0037] like Figures 1 to 6 As shown, an embodiment of the utility model discloses a protective structure for protecting a battery cell 30, the protective structure comprising: a second protective plate 20 and a first protective plate 10 stacked in sequence, the second protective plate 20 being connected to the first protective plate 10, and the second protective plate 20 being arranged on a side of the protective structure away from the battery cell 30; at least one accommodating cavity 21 is arranged in the second protective plate 20, and the accommodating cavity 21 is filled with a non-Newtonian fluid.

[0038] like Figures 1 to 6As shown, an embodiment of the utility model discloses a protective structure, which is used to protect the battery cells of a battery pack. The protective structure is arranged on the outside of the battery cell, and the battery cell 30 can be jointly protected by the first protective plate 10 and the second protective plate 20 of the protective structure. The protective ability of the protective structure is stronger and the battery cell is safer. Furthermore, in an embodiment of the utility model, the first protective plate 10 of the protective structure is arranged on the side close to the battery cell 30, and the second protective plate 20 is arranged on the side away from the battery cell 30. Among them, a accommodating cavity 21 is arranged in the second protective plate 20, and the accommodating cavity 21 is filled with a non-Newtonian fluid, so that the second protective plate 20 has a stronger impact resistance. When the battery pack is subjected to a relatively strong impact, the second protective plate 20 can better protect the battery cell 30, avoid failure of the protective structure, and cause the safety of the battery cell to be threatened.

[0039] like Figure 3 As shown, the protective structure disclosed in the embodiment of the utility model includes a second protective plate 20 and a first protective plate 10 stacked in sequence. The second protective plate 20 is connected to the first protective plate 10, and the second protective plate 20 is arranged on the side of the protective structure away from the battery cell 30, that is, the first protective plate 10 is arranged on the side of the protective structure close to the battery cell 30.

[0040] Specifically, the second protective plate 20 can be bonded to the first protective plate 10, the second protective plate 20 can be snapped to the first protective plate 10, or the second protective plate 20 can be detachably connected to the first protective plate 10. In the embodiment of the utility model, there is no specific restriction on the specific connection method between the second protective plate 20 and the first protective plate 10. In actual applications, technicians can set it as needed.

[0041] like Figure 2 As shown, at least one accommodating cavity 21 is provided in the second protective plate 20 in the embodiment of the utility model, and the accommodating cavity 21 is filled with a non-Newtonian fluid. Among them, the non-Newtonian fluid is different from the Newtonian fluid. The shear stress and shear strain rate of the non-Newtonian fluid are not in a linear relationship. Non-Newtonian fluids are widely present in real life and are relatively easy to obtain. Therefore, the manufacturing cost of the second protective plate 20 is relatively low.

[0042] Specifically, a dilatant fluid is a relatively common non-Newtonian fluid. The flow characteristics of a dilatant fluid are characterized by an increase in viscosity as the shear rate increases, a phenomenon called dilatation. In other words, when the shear rate increases, water cannot fill the gaps between the particles, resulting in an increase in viscous resistance or even a loss of flow characteristics. Based on this property of the dilatant fluid, in an embodiment of the utility model, the dilatant fluid can be filled into the accommodating cavity 21 of the second protective plate 20 as a non-Newtonian fluid to improve the ability of the second protective plate 20 to resist high-intensity impacts.

[0043] For example, the dilatant fluid may be a shear thickening viscose, the viscosity of which increases with the increase of the shear rate, so it has good impact resistance.

[0044] Of course, in the embodiment of the present invention, there is no specific restriction on the specific material of the non-Newtonian fluid. In practical applications, technicians can select a suitable non-Newtonian fluid to fill the accommodating cavity 21 of the second protective plate 20 as needed to enhance the impact resistance of the second protective plate 20.

[0045] It should be noted that, in the embodiment of the utility model, one or more accommodating chambers 21 may be provided. In the case where more than one accommodating chamber 21 is provided, the more than one accommodating chambers 21 are arranged in the second protective plate 20 at intervals.

[0046] The embodiment of the utility model discloses a protective structure, which is used for protecting a battery cell. The protective structure includes a second protective plate 20 and a first protective plate 10 stacked in sequence, wherein the second protective plate 20 is connected to the first protective plate 10, and the second protective plate 20 is arranged on a side of the protective structure away from the battery cell 30. At least one accommodating cavity 21 is arranged in the second protective plate 20, and the accommodating cavity 21 is filled with a non-Newtonian fluid. When the protective structure in the embodiment of the utility model is arranged outside the battery cell 30, the battery cell 30 can be protected together by the first protective plate 10 and the second protective plate 20 of the protective structure, and the protective ability of the protective structure is stronger, and the battery cell 30 is safer.

[0047] Furthermore, in the present invention, the first protective plate 10 of the protective structure is arranged on a side close to the battery cell 30, and the second protective plate 20 is arranged on a side away from the battery cell 10. The second protective plate 20 is provided with a receiving cavity 21, and the receiving cavity 21 is filled with a non-Newtonian fluid, so that the second protective plate 20 has a stronger impact resistance. When the battery pack is subjected to a relatively strong impact, the second protective plate 20 can better protect the battery cell 30, avoid failure of the protective structure, and cause the safety of the battery cell 30 to be threatened.

[0048] Alternatively, if Figure 2 and Figure 3 As shown, the accommodating chamber 21 in the embodiment of the utility model includes a plurality of accommodating chambers 21, and the plurality of accommodating chambers 21 are arranged at intervals in the second protective plate 20.

[0049] like Figure 2 and Figure 3 As shown, in the embodiment of the utility model, a plurality of accommodating cavities 21 are arranged at intervals in the second protective plate 20, and non-Newtonian fluid is filled in each accommodating cavity 21. The fluidity of the non-Newtonian fluid is suppressed by the plurality of accommodating cavities 21, thereby improving the reliability of the second protective plate 20. Thus, the protective structure can better protect the battery cell 30.

[0050] Alternatively, if Figure 5 As shown, along the first direction A, multiple accommodating cavities 21 are arranged at intervals in the second protective plate 20, and along the second direction B, the accommodating cavities 21 penetrate the second protective plate 20; wherein, the first direction A is perpendicular to the thickness direction of the protective structure, and the second direction B is perpendicular to the first direction and the thickness direction of the protective structure.

[0051] like Figure 5 As shown, in the embodiment of the utility model, a plurality of accommodating cavities 21 are arranged in the second protective plate 20 at intervals along the first direction A, and non-Newtonian fluid is filled in each accommodating cavity 21. The fluidity of the non-Newtonian fluid is suppressed by the plurality of accommodating cavities 21, thereby improving the reliability of the second protective plate 20.

[0052] The accommodating cavity 21 penetrates the second protective plate 20 along the second direction B. It can be understood that, along the second direction B, the length of the accommodating cavity 21 is the same as the length of the second protective plate 20 . The reliability of the second protective plate 20 is further enhanced by the accommodating cavity 21 .

[0053] Alternatively, if Figure 1 and Figure 3 As shown, the first protective plate 10 in the embodiment of the utility model includes a first plate body 11 and a second plate body 12, and the first plate body 11 and the second plate body 12 are spaced apart along the thickness direction of the protective structure; the first protective plate 10 also includes a buffer cavity, and the buffer cavity is arranged between the first plate body 11 and the second plate body 12.

[0054] like Figure 1 and Figure 3 As shown, the first protective plate 10 in the embodiment of the utility model includes a first plate body 11 and a second plate body 12 spaced apart in the thickness direction of the protective structure, and a buffer cavity arranged between the first plate body 11 and the second plate body 12. The buffer cavity is connected to the first plate body 11 and / or the second plate body 12. When the protective structure is hit, the buffer cavity arranged in the first protective plate 10 can absorb the impact force, thereby better protecting the battery cell 30.

[0055] It should be noted that the cross section of the buffer cavity in the embodiment of the utility model can be a triangle, a quadrilateral, a pentagon, or a hexagon. In the embodiment of the utility model, there are no excessive restrictions on the specific structure of the buffer cavity.

[0056] Alternatively, if Figure 1 and Figure 3 As shown, the buffer cavity in the embodiment of the utility model includes a first buffer cavity 13 and a second buffer cavity 14 . The first buffer cavity 13 is connected to the first plate body 11 , and the second buffer cavity 14 is connected to the second plate body 12 .

[0057] like Figure 1 and Figure 3 As shown, the buffer cavity in the embodiment of the utility model includes a first buffer cavity 13 and a second buffer cavity 14, and the first buffer cavity 13 is connected to the first plate body 11, and the second buffer cavity 14 is connected to the second plate body 12. When the protective structure is impacted, the first buffer cavity 13 and the second buffer cavity 14 can better support the first plate body 11 and the second plate body 12, so that the first protective plate 10 absorbs greater impact force to better protect the battery cell 30.

[0058] Alternatively, if Figure 1 and Figure 3 As shown, the first buffer cavity 13 and the second buffer cavity 14 each include a plurality of first buffer cavities 13 , the plurality of first buffer cavities 13 are arranged at intervals, and the plurality of second buffer cavities 14 are also arranged at intervals.

[0059] like Figure 1 and Figure 3 As shown, the first buffer cavity 13 in the embodiment of the utility model includes a plurality of first buffer cavities 13, which are spaced apart and connected to the first plate 11. The second buffer cavity 14 also includes a plurality of second buffer cavities 14, which are spaced apart and connected to the second plate 12. When the protective structure is impacted, the plurality of first buffer cavities 13 and the plurality of second buffer cavities 14 can better support the first plate 11 and the second plate 12, so that the first protective plate 10 absorbs greater impact force to better protect the battery cell 30.

[0060] Alternatively, if Figure 1 and Figure 3 As shown, along the first direction A, a plurality of first buffer cavities 13 and a plurality of second buffer cavities 14 are alternately arranged; wherein the first direction A is perpendicular to the thickness direction of the protective structure.

[0061] like Figure 1 and Figure 3 As shown, in the embodiment of the utility model, a plurality of first buffer chambers 13 and a plurality of second buffer chambers 14 are staggered along the first direction A. Thus, the thickness of the first protective plate 10 can be reduced while the protective strength of the first protective plate 10 is enhanced, so that the first protective plate 10 is thinner, thereby reducing the volume of the battery pack.

[0062] Specifically, Figure 1 and Figure 3 As shown, along the first direction A, the cross-section of the first buffer cavity 13 is a first trapezoid, and the length of the bottom edge of the first trapezoid close to the first plate body 11 is greater than the length of the bottom edge of the first trapezoid away from the first plate body 11; along the first direction A, the cross-section of the second buffer cavity 14 is also a second trapezoid, and the length of the bottom edge of the second trapezoid close to the second plate body 12 is greater than the length of the bottom edge of the second trapezoid away from the second plate body 12.

[0063] In the embodiment of the utility model, Figure 1 and Figure 3 As shown, along the first direction A, the cross-section of the first buffer cavity 13 is set to a first trapezoid, and the length of the bottom edge of the first trapezoid close to the first plate body 11 is set to be greater than the length of the bottom edge of the first trapezoid away from the first plate body 11. Similarly, along the first direction A, the cross-section of the second buffer cavity 14 is set to a second trapezoid, and the structure of the second trapezoid is the same as that of the first trapezoid, and the length of the bottom edge of the second trapezoid close to the second plate body 12 is set to be greater than the length of the bottom edge of the second trapezoid away from the second plate body 12. When the protective structure is impacted, the first buffer cavity 13 can extend into the gap between two adjacent second buffer cavities 14, and the second buffer cavity 14 can also extend into the gap between two adjacent first buffer cavities 13, so as to further reduce the thickness of the first protective plate 10 and reduce the volume of the battery pack.

[0064] Alternatively, if Figure 5 As shown, along the second direction B, the first buffer cavity 13 and the second buffer cavity 14 penetrate the first protective plate 10, wherein the second direction B is perpendicular to the first direction A and the thickness direction of the protective structure.

[0065] like Figure 5 As shown, in the embodiment of the utility model, along the second direction B, the first buffer cavity 13 and the second buffer cavity 14 penetrate the first protective plate 10. That is, along the second direction B, the length of the first buffer cavity 13 and the second buffer cavity 14 is the same as the length of the first protective plate 10. Along the second direction B, the first buffer cavity 13 and the second buffer cavity 14 penetrate the first protective plate 10. The reliability of the first protective plate 10 is further enhanced by the first buffer cavity 13 and the second buffer cavity 14.

[0066] like Figures 4 to 6 As shown, an embodiment of the utility model further discloses a battery pack, which includes a battery cell 30 and the protective structure described in the above embodiment, and a first protective plate 10 is arranged on a side of the protective structure close to the battery cell 30.

[0067] like Figure 5 As shown, the protective structure in the embodiment of the utility model has a dual protection function. When the battery pack is subjected to a relatively violent impact, the second protective plate 20 is impacted first. Based on the characteristics of the non-Newtonian fluid in the second protective plate 20, at this time, the viscosity of the non-Newtonian fluid rises rapidly, which can resist instantaneous high-intensity impact and disperse the impact force over a large area. The remaining undispersed impact force reaches the first protective plate 10, and the buffer cavity provided in the first protective plate 10 can absorb part of the impact force to better protect the battery cell 30.

[0068] It should be noted that if Figure 4 and Figure 5As shown, the battery pack in the embodiment of the utility model may further include a tray bottom plate 40 , and the tray bottom plate 40 is disposed between the first protective plate 10 and the battery cell 30 , so that the protective structure is connected to the battery cell 30 through the tray bottom plate 40 .

[0069] In addition, if Figure 6 As shown, the battery pack in the embodiment of the utility model is also provided with a cooling plate 50 and a thermally conductive adhesive 60. The cold plate 50 is bonded to the outer side of the battery cell 30 by the thermally conductive adhesive 60, so that the heat emitted by the battery cell 30 is conducted to the cooling plate 50 by the thermally conductive adhesive 60, and the heat is absorbed by the cooling plate 50 to reduce the temperature of the battery cell 30.

[0070] The utility model embodiment also discloses an electric device, which includes an electric device and the battery pack described in the above embodiment, wherein the battery pack is connected to the electric device.

[0071] The electrical equipment described in the embodiment of the utility model can be a vehicle, and the vehicle can be a hybrid electric vehicle or a pure electric vehicle, and no specific limitation is made to this.

[0072] Of course, the electric device can also be any other electric device that needs to use a battery pack. In the embodiment of the utility model, there are no excessive restrictions on the specific type of the electric device, and any electric device belongs to the protection scope of the utility model.

[0073] It should be noted that in the embodiment of the utility model, the battery pack included in the electrical equipment has the same structure as the battery pack described in the above embodiment, and its beneficial effects are also similar, which will not be described in detail here.

[0074] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0075] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0076] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0077] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A protective structure for protecting a battery cell, characterized in that: include: A second protective plate and a first protective plate stacked in sequence, wherein the second protective plate is connected to the first protective plate, and the second protective plate is arranged on a side of the protective structure away from the battery cell; At least one accommodating cavity is arranged in the second protective plate, and the accommodating cavity is filled with a non-Newtonian fluid.

2. The protective structure according to claim 1, characterized in that: The accommodating cavities include a plurality of accommodating cavities, and the plurality of accommodating cavities are arranged at intervals in the second protective plate.

3. The protective structure according to claim 2, characterized in that: Along the first direction, a plurality of the accommodating cavities are arranged in the second protective plate at intervals, and along the second direction, the accommodating cavities penetrate the second protective plate; The first direction is perpendicular to the thickness direction of the protective structure, and the second direction is perpendicular to the first direction and the thickness direction of the protective structure.

4. The protective structure according to any one of claims 1 to 3, characterized in that: The non-Newtonian fluid includes a shear thickening glue.

5. The protective structure according to claim 1, characterized in that: The first protective plate includes a first plate body and a second plate body, and the first plate body and the second plate body are spaced apart along the thickness direction of the protective structure; The first protective plate further includes a buffer cavity, and the buffer cavity is arranged between the first plate body and the second plate body.

6. The protective structure according to claim 5, characterized in that: The buffer cavity includes a first buffer cavity and a second buffer cavity, the first buffer cavity is connected to the first plate body, and the second buffer cavity is connected to the second plate body.

7. The protective structure according to claim 6, characterized in that: The first buffer cavity and the second buffer cavity each include a plurality of, wherein, The plurality of first buffer cavities are arranged at intervals, and the plurality of second buffer cavities are also arranged at intervals.

8. The protective structure according to claim 7, characterized in that: Along the first direction, a plurality of the first buffer cavities and a plurality of the second buffer cavities are arranged alternately; Wherein, the first direction is perpendicular to the thickness direction of the protective structure.

9. The protective structure according to claim 8, characterized in that: Along the first direction, the cross section of the first buffer cavity is a first trapezoid, and the length of the bottom side of the first trapezoid close to the first plate body is greater than the length of the bottom side of the first trapezoid away from the first plate body; Along the first direction, the cross section of the second buffer cavity is a second trapezoid, and the length of the bottom edge of the second trapezoid close to the second plate body is greater than the length of the bottom edge of the second trapezoid away from the second plate body.

10. The protective structure according to claim 8, characterized in that: Along the second direction, the first buffer cavity and the second buffer cavity penetrate the first protective plate; The second direction is perpendicular to the first direction and the thickness direction of the protective structure.

11. A battery pack, characterized in that: It comprises a battery cell and the protective structure according to any one of claims 1 to 10, wherein the first protective plate is arranged on a side of the protective structure close to the battery cell.

12. An electrical equipment, characterized in that: It comprises an electrical device and the battery pack as claimed in claim 11, wherein the battery pack is connected to the electrical device.

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