Protective device and lithium battery pack

Abstract

The invention provides a protection device and a lithium battery pack, and relates to the technical field of lithium battery packs. The protection device comprises a first shell and a second shell, a first cavity is formed in the first shell, a first opening communicated with the first cavity is formed in the side portion, in the first direction, of the first shell, the first cavity is used for containing a battery body, and an elastic assembly is arranged at the bottom of the first shell; the second shell is internally provided with a second cavity, the top of the second shell is provided with a second opening communicated with the second cavity, and the second cavity is used for containing the first shell and sealing the second opening through the first shell; the two adjusting assemblies are movably arranged on the two opposite sides of the second shell in the second direction, and the adjusting ends of the adjusting assemblies are located in the first cavity, matched with the first shell and used for adjusting the first shell to be fixed in the second cavity or move out of the second shell.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery packs, and in particular to a protective device and a lithium battery pack. Background Art

[0002] With the development of society, the application of lithium-ion secondary batteries is becoming more and more extensive, and people's demand for lithium-ion batteries is also increasing, and higher requirements are also placed on their performance. However, lithium-ion batteries use flammable organic solvent electrolytes, so high requirements are placed on thermal management. In recent years, all-solid-state batteries have been proposed that use solid electrolytes to replace electrolytes to improve battery safety.

[0003] In solid-state battery applications, according to the current design of solid-state battery shells, when inspecting and repairing solid-state batteries, users need to completely disassemble the battery protective shell, which not only increases the complexity of the operation, but may also cause the loss or damage of parts, thereby extending maintenance time and increasing the risk of errors. At the same time, users need to use additional tools and time to complete these operations, which limits the frequency and efficiency of battery inspections.

[0004] Therefore, there is an urgent need to provide a protective device that can reliably protect solid-state batteries and is easy to disassemble. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a protective device and a lithium battery pack to solve the current technical problems of difficult removal and complicated operation of the protective shell.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] In a first aspect, the present application provides a protective device, comprising: a first shell having a first cavity inside, and a first opening communicating with the first cavity is provided at a side portion of the first shell in a first direction, the first cavity is used to accommodate a battery body, and an elastic component is provided at the bottom of the first shell;

[0008] a second shell, having a second cavity inside thereof, and a second opening communicating with the second cavity at the top of the second shell, wherein the second cavity is used to accommodate the first shell, and the second opening is closed by the first shell; and

[0009] Two groups of adjustment components are movably arranged on two opposite sides of the second shell in the second direction, and the adjustment ends of the adjustment components are located in the first cavity and cooperate with the first shell to adjust the first shell to be fixed in the second cavity or to be moved out of the second shell;

[0010] The first direction and the second direction are perpendicular to each other and are respectively perpendicular to the height directions of the first shell and the second shell.

[0011] In some modified implementations of the first aspect of the present application,

[0012] A built-in plate is disposed on the bottom side of the first shell, and the built-in plate is fixed to the bottom of the second cavity;

[0013] The elastic component includes: a plurality of spring monomers, the extension direction of the spring monomers is the same as the height direction of the first shell, and the two ends of the spring monomers are respectively connected to the first shell and the built-in plate.

[0014] In some modified implementations of the first aspect of the present application,

[0015] The bottoms of two side surfaces of the first shell facing each other in the second direction are respectively provided with abutment edges;

[0016] The second shell is provided with threaded holes on two opposite sides in the second direction;

[0017] The adjustment component comprises:

[0018] An adjusting rod, penetrating through the wall of the second shell and being threadedly connected to the corresponding threaded hole;

[0019] A linkage block, which is the adjustment end of the adjustment assembly and is connected to the end of the adjustment rod located in the second cavity. The linkage block is located on the top side of the abutting edge and is configured as a long strip structure for pressing the abutting edge; and

[0020] An adjusting handle is installed on the end of the adjusting rod located outside the second shell.

[0021] In some modified implementations of the first aspect of the present application, when the adjustment handle is rotated to adjust the linkage block to be parallel to the interference edge, the first shell pops out of the second shell under the elastic force of the elastic component.

[0022] In some modified implementations of the first aspect of the present application,

[0023] Two end surfaces of the linkage block are in active contact with the first shell and the second shell respectively;

[0024] The adjacent side surfaces of the linkage block are smoothly transitioned.

[0025] In some modified implementations of the first aspect of the present application,

[0026] The outer side surface of the shell wall of the second shell opposite to the second direction is provided with a groove;

[0027] The adjusting handle is embedded in the groove and can rotate in the groove.

[0028] In some modified implementations of the first aspect of the present application, a top cover is provided on the top of the first shell, for covering a side of the second shell where the second opening is located;

[0029] The top cover is provided with a positive terminal and a negative terminal, which are respectively used to connect the positive electrode tab and the negative electrode tab of the battery body.

[0030] In some modified implementations of the first aspect of the present application,

[0031] A limit groove is provided on the end surface of the shell wall of the second shell and the second opening on the same side;

[0032] The outer periphery of the bottom surface of the top cover is provided with a limiting clip strip corresponding to and adapted to the limiting clip slot.

[0033] In some modified implementations of the first aspect of the present application, a flexible protective layer is provided on the outer side of the shell wall of the first shell.

[0034] A second aspect of the present application provides a lithium battery pack, the lithium battery pack comprising: a battery body;

[0035] As in the above-mentioned protective device, the battery body is placed in the first cavity of the first shell of the protective device.

[0036] Compared with the prior art, the protective device and lithium battery pack provided in the present application adopt a multi-layer protective structure, including a first shell and a second shell. The second shell provides solid external protection, which can withstand external physical impacts, dust, moisture and other influences, ensuring that the battery body is protected from the influence of the external environment. The first shell forms a second line of defense, and through close cooperation with the second shell, it can effectively absorb external impact force and reduce the pressure directly borne by the battery body. Through the cooperation of the elastic component and the adjustment component at the bottom of the first shell, the first shell can be positioned in the second shell, or the first shell can be conveniently moved out of the second shell, which is convenient for inspection, replacement or maintenance of the battery body. The elastic component can also play a role in buffering protection and resisting slight volume deformation of the battery body, further improving the safety of the lithium battery pack and ensuring that the battery body can remain stable and safe under various conditions of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0038] Figure 1 The structure diagram of the protection device provided by the embodiment of the present invention is schematically shown;

[0039] Figure 2 The structure diagram of the first shell of the protective device provided by the embodiment of the present invention is schematically shown;

[0040] Figure 3 The structure diagram of the second shell of the protective device provided by the embodiment of the present invention is schematically shown;

[0041] Figure 4 The structure diagram of the adjustment component of the protective device provided by the embodiment of the present invention is schematically shown;

[0042] Description of Figure Numbers:

[0043] 1. First shell; 11. First cavity; 12. Abutment edge; 13. Top cover; 131. Positive terminal; 132. Negative terminal; 2. Second shell; 21. Second opening; 22. Second cavity; 23. Groove; 24. Limiting slot; 3. Spring monomer; 4. Adjustment assembly; 41. Adjustment rod; 42. Linkage block; 43. Adjustment handle; 5. Built-in board; 6. Battery body; x, first direction; y, second direction. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0046] Embodiment 1

[0047] Reference Figure 1 -Attached Figure 4, Embodiment 1 of the present invention proposes a protective device, which includes: a first shell 1, which has a first cavity 11 inside, and the side of the first shell 1 in the first direction x has a first opening connected to the first cavity 11, the first cavity 11 is used to accommodate the battery body 6, and the bottom of the first shell 1 is provided with an elastic component; a second shell 2, which has a second cavity 22 inside, and the top of the second shell 2 has a second opening 21 connected to the second cavity 22, the second cavity 22 is used to accommodate the first shell 1, and the second opening 21 is closed by the first shell 1; and two groups of adjustment components 4, which are movably arranged on opposite sides of the second shell 2 in the second direction y, the adjustment end of the adjustment component 4 is located in the first cavity 11 and cooperates with the first shell 1, and is used to adjust the first shell 1 to be fixed in the second cavity 22 or moved out of the second shell 2; wherein the first direction x and the second direction y are perpendicular to each other, and are respectively perpendicular to the height directions of the first shell 1 and the second shell 2.

[0048] Specifically, the protective device provided in this embodiment is used to accommodate and protect the battery body 6 of the lithium battery pack, where the battery body 6 can be a solid-state battery. The protective device adopts a multi-layer protective structure, including a first shell 1 and a second shell 2. The first shell 1 is used to accommodate the battery body 6, and the first shell 1 can be accommodated in the second shell 2. Through the cooperation of the elastic component at the bottom of the first shell 1 and the adjustment component 4, the first shell 1 can be positioned in the second shell 2, or the first shell 1 can be conveniently moved out of the second shell 2, and the elastic component can also play a role in buffering protection and resisting slight volume deformation of the battery body 6.

[0049] Reference Figure 1 and attached Figure 2 The first shell 1 is a cubic shell structure, and has a first cavity 11 adapted to the battery body 6 inside, and the side of the first shell 1 in the first direction x has a first opening connected to the first cavity 11. The first direction x here can refer to the width direction of the first shell 1, and the battery body 6 can be installed in the first cavity 11 through the first opening; the first opening can be set only on one side of the first cavity 11, or the first openings can be set on the opposite sides of the first cavity 11 in the first direction x, that is, the first cavity 11 is a cavity structure that passes through along the first direction x, which is more convenient for the assembly, disassembly or maintenance of the battery body 6; in order to improve the protection of the battery body 6, a buffer structure layer can be set on the cavity wall of the first cavity 11.

[0050] Reference Figure 1 and attached Figure 3The second shell 2 is a cubic shell structure with a volume larger than that of the first shell 1, and has a second cavity 22 inside that can accommodate the first shell 1. The top of the second shell 2 has a second opening 21, so that the first shell 1 can be installed into the second cavity 22 of the second shell 2 or removed from the second cavity 22 through the second opening 21; after the first shell 1 is installed in the second cavity 22, the first shell 1 can close the second opening 21, so that the first shell 1 and the second shell 2 form a complete and regular cubic structure.

[0051] In order to further reduce the impact of collision and vibration on the battery body 6, a buffer structure layer may be provided on the outer wall of the first shell 1 and / or the cavity wall of the second cavity 22, and the material of the buffer structure layer is not specifically limited here.

[0052] Reference Figure 1 , an elastic component is arranged at the bottom of the first shell 1, and when the first shell 1 is completely accommodated in the first cavity 11, the elastic component is in a compressed state; two groups of adjustment components 4 are movably arranged on opposite sides of the second shell 2 in the second direction y, where the second direction y is perpendicular to the first direction x, and can be the length direction of the first shell 1 and the second shell 2, and the movable arrangement means that at least the adjustment end of the adjustment component 4 located in the first cavity 11 can be movable relative to the second shell 2, and can cooperate with the second shell 2 to adjust the position of the first shell 1 in the second cavity 22 of the second shell 2, at least including: through the cooperation of the two groups of adjustment components 4 and the first shell 1, the elastic force of the elastic component can be overcome to position the first shell 1 in the second cavity 22, and the limitation of the first shell 1 can be released, so that the first shell 1 pops out from the second cavity 22 under the action of the elastic force of the elastic component, so that the battery body 6 can be conveniently inspected, replaced or maintained, and the cumbersome disassembly process can be avoided, saving the time and energy of the operator.

[0053] According to the above, an embodiment of the present invention proposes a protective device, which adopts a multi-layer protective structure, including a first shell 1 and a second shell 2. The second shell 2 provides solid external protection, which can withstand external physical impact, dust, moisture and other influences, ensuring that the battery body 6 is protected from the influence of the external environment. The first shell 1 forms a second line of defense, and through close cooperation with the second shell 2, it can effectively absorb the impact force from the outside and reduce the pressure directly borne by the battery body 6; through the cooperation of the elastic component at the bottom of the first shell 1 and the adjustment component 4, the first shell 1 can be positioned in the second shell 2, or the first shell 1 can be conveniently moved out of the second shell 2, which is convenient for inspection, replacement or maintenance of the battery body 6, and the elastic component can also play a role in buffering protection and resisting slight volume deformation of the battery body 6, further improving the safety of the lithium battery pack, and ensuring that the battery body 6 can remain stable and safe under various conditions of use.

[0054] For further information, see Attachment Figure 2 In a specific implementation, a built-in plate 5 is provided on the bottom side of the first shell 1, and the built-in plate 5 is fixed to the bottom of the second cavity 22; the elastic component includes: a plurality of spring monomers 3, the extension direction of the spring monomers 3 is the same as the height direction of the first shell 1, and the two ends are respectively connected to the first shell 1 and the built-in plate 5.

[0055] Specifically, in the technical solution adopted by the present invention, a built-in plate 5 can be arranged at the bottom of the first shell 1, and the built-in plate 5 can be arranged to have a cross-sectional shape and size that are respectively adapted to the cross-sectional shape and size of the second cavity 22, and the built-in plate 5 is fixed to the cavity of the second cavity 22. The fixing method can be but is not limited to gluing, structural connection using screws, etc., which is not specifically limited here; the elastic component can be arranged to include a plurality of spring monomers 3, the extension direction of the spring monomers 3 is in the same direction as the height direction of the first shell 1, and the two ends of the spring monomers 3 are respectively connected to the shell bottom of the first shell 1 and the surface of the built-in plate 5; the number of spring monomers 3 is at least four, and they are distributed at least at the four corners of the shell bottom of the first shell 1, which can achieve stable support for the first shell 1 and can reliably provide elastic force to the first shell 1.

[0056] For further information, see Attachment Figure 1 -Attached Figure 4 In a specific implementation, the first shell 1 is respectively provided with abutment edges 12 at the bottom of the two opposite side surfaces in the second direction y; the second shell 2 is respectively provided with threaded holes on the two opposite sides in the second direction y; the adjustment component 4 includes: an adjustment rod 41, which passes through the shell wall of the second shell 2 and is screwed with the corresponding threaded hole; a linkage block 42, which is the adjustment end of the adjustment component 4 and is connected to the end of the adjustment rod 41 located in the second cavity 22, the linkage block 42 is located on the top side of the abutment edge 12, and is set to a long strip structure for pressing the abutment edge 12; and an adjustment handle 43, which is installed at the end of the adjustment rod 41 located outside the second shell 2.

[0057] Specifically, in order to achieve the coordination between the adjustment component 4, the elastic component and the first shell 1, in the technical solution adopted by the present invention, abutment edges 12 are arranged on the two opposite side surfaces of the first shell 1 in the second direction y. The abutment edge 12 can be located on the bottom side of the first shell 1 and can be arranged as a long strip structure extending along the first direction x. The length extending in the first direction x can be equal to the size of the first shell 1 in the first direction x. The adjusting assembly 4 is composed of an adjusting rod 41, a linkage block 42 and an adjusting handle 43. The adjusting rod 41 passes through the shell wall of the second shell 2 and is screwed with the corresponding threaded hole. The linkage block 42 is the adjusting end of the adjusting assembly 4 and is fixedly connected to the end of the adjusting rod 41 located in the second cavity 22. The linkage block 42 is set as a long strip structure. Through the rotation of the adjusting rod 41, the linkage block 42 can press the abutting edge 12 to achieve the pressing effect on the abutting edge 12 to achieve the first shell 1 to be pressed down to be loaded into the second cavity 22, or the linkage block 42 can also release the pressing effect on the abutting edge 12 to achieve the elastic force of the elastic assembly to drive the first shell 1 to pop up upward. In this process, the cooperation between the linkage block 42 and the abutting edge 12 can achieve the limiting of the first shell 1 and limit the first shell 1 from completely escaping from the second cavity 22. The adjusting handle 43 is fixed to the end of the adjusting rod 41 located outside the second shell 2. The adjusting handle 43 can be in the shape of a long rod, but is not limited thereto, so that the operator can rotate the adjusting rod 41 by operating the adjusting handle 43.

[0058] When the adjustment assembly 4 is used, the adjustment rod 41 and the linkage block 42 can be driven to rotate by rotating the adjustment handle 43. When the adjustment handle 43 is rotated until the linkage block 42 is parallel to the abutting edge 12, as shown in the attached Figure 1 As shown, the first shell 1 pops out of the second shell 2 under the elastic force of multiple spring monomers 3 of the elastic component; when the adjusting handle 43 is rotated to control the linkage block 42 to rotate downward, the linkage block 42 applies pressure to the abutting edge 12, so that the abutting edge 12 drives the first shell 1 to move downward in the second cavity 22 until the first shell 1 is completely accommodated in the second shell 2. At this time, the adjusting handle 43 can be in a shape perpendicular to the abutting edge 12, but is not limited to this.

[0059] For further information, see Attachment Figure 4 In a specific implementation, the two end faces of the linkage block 42 are in active contact with the first shell 1 and the second shell 2 respectively; and the adjacent side faces of the linkage block 42 are smoothly transitioned.

[0060] Specifically, in order to improve the smoothness of the cooperation between the linkage block 42 and the abutting edge 12, in the technical solution adopted by the present invention, the linkage block 42 is configured as a long strip plate structure, and its two end faces are movably fitted with the corresponding shell walls of the first shell 1 and the second shell 2 respectively, and the two side surfaces extending along the length direction of the linkage block 42 can be configured as planes, and the two side surfaces extending along the width direction can be configured as arc surfaces to achieve a smooth transition between adjacent side surfaces, thereby improving the smoothness of the cooperation between the linkage block 42 and the abutting edge 12 as the adjusting rod 41 and the adjusting handle 43 rotate, which helps to reduce resistance.

[0061] For further information, see Attachment Figure 1 and attached Figure 3 In a specific implementation, a groove 23 is provided on the outer side surface of the shell wall of the second shell 2 opposite to the second direction y; the adjustment handle 43 is embedded in the groove 23 and can rotate in the groove 23.

[0062] Specifically, in order to simplify the external structure of the protective device and prevent the adjustment handle 43 from being accidentally touched, in the technical solution adopted by the present invention, the outer side surfaces of the second shell 2 on both sides opposite to each other in the second direction y are respectively provided with grooves 23 corresponding to the threaded holes. The groove 23 can be set as a circular groove, and the depth of the groove 23 can be set to just accommodate the adjustment component 4, so that the adjustment handle 43 is located in the groove 23 and can rotate freely in the groove 23. The design of embedding the adjustment handle 43 in the groove 23 can prevent the external structure from accidentally touching the adjustment handle 43 and affecting the state of the adjustment component 4, and can simplify the structure of the device.

[0063] For further information, see Attachment Figure 1 and attached Figure 3 In a specific implementation, a top cover 13 is provided on the top of the first shell 1 to cover the side of the second opening 21 of the second shell 2; a positive terminal 131 and a negative terminal 132 are provided on the top cover 13 to connect the positive electrode tab and the negative electrode tab of the battery body 6, respectively.

[0064] Specifically, in the technical solution adopted by the present invention, a top cover 13 is arranged on the top of the first shell 1, and the cross-sectional size of the top cover 13 is adapted to the outer cross-sectional size of the second shell 2, so that when the first shell 1 is completely accommodated in the second cavity 22, the top cover 13 can completely cover the second shell 2 of the second shell 2 and form a complete cubic structure with the second shell 2; a positive terminal 131 and a negative terminal 132 are arranged on the top cover 13, which can be respectively connected to the positive electrode tab and the negative electrode tab of the battery body 6 accommodated in the first cavity 11, and the connection method is not specifically limited here.

[0065] Among them, refer to the attached Figure 1 and attached Figure 3 In order to improve the tightness of the fit between the top cover 13 and the second shell 2, in a specific implementation, a limit slot 24 can be provided on the end surface of the shell wall of the second shell 2 on the same side as the second opening 21, and a limit strip corresponding to and adapted to the limit slot 24 is correspondingly provided on the outer periphery of the bottom surface of the top cover 13. When the top cover 13 covers the second shell 2, the accuracy and tightness of the fit between the top cover 13 and the second shell 2 can be improved through the cooperation between the limit strip and the limit slot 24; wherein, the limit ring groove can be arranged around a circle, and correspondingly, the limit strip can be arranged around a circle on the bottom surface of the top cover 13.

[0066] Embodiment 2

[0067] Reference Figure 1 A second embodiment of the present invention provides a lithium battery pack, which includes: a battery body 6; and the above-mentioned protective device, wherein the battery body 6 is placed in a first cavity 11 of a first shell 1 of the protective device.

[0068] Specifically, the protective device is used to accommodate and protect the battery body 6 of the lithium battery pack. The protective device adopts a multi-layer protective structure, which can provide reliable protection for the battery body 6, absorb external impact force, reduce the pressure on the battery body 6, and resist the influence of the external environment on the battery body 6; through the cooperation of the elastic component at the bottom of the first shell 1 and the adjustment component 4, the first shell 1 can be positioned in the second shell 2, or the first shell 1 can be easily moved out of the second shell 2, which is convenient for inspection, replacement or maintenance of the battery body 6, and the elastic component can also play a role in buffering protection and resisting slight volume deformation of the battery body 6, further improving the safety of the lithium battery pack and ensuring that the battery body 6 can remain stable and safe under various conditions of use.

[0069] It should be noted that in the description of this specification, the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "connect", "install", "fixed", etc. should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A protective device, characterized in that: include: A first shell (1), having a first cavity (11) inside, and a side portion of the first shell (1) in a first direction (x) having a first opening communicating with the first cavity (11), the first cavity (11) being used to accommodate a battery body (6), and an elastic component being provided at the bottom of the first shell (1); a second shell (2), having a second cavity (22) inside thereof, and a top of the second shell (2) having a second opening (21) in communication with the second cavity (22), the second cavity (22) being used to accommodate the first shell (1), and the second opening (21) being closed by the first shell (1); and Two groups of adjustment components (4) are movably arranged on two opposite sides of the second shell (2) in the second direction (y), the adjustment ends of the adjustment components (4) are located in the first cavity (11) and cooperate with the first shell (1) to adjust the first shell (1) to be fixed in the second cavity (22) or to be moved out of the second shell (2); The first direction (x) and the second direction (y) are perpendicular to each other and are respectively perpendicular to the height directions of the first shell (1) and the second shell (2).

2. The protective device according to claim 1, characterized in that: A built-in plate (5) is provided on the bottom side of the first shell (1), and the built-in plate (5) is fixed to the bottom of the second cavity (22); The elastic component comprises: a plurality of spring monomers (3), the extension direction of the spring monomers (3) being in the same direction as the height direction of the first shell (1), and the two ends of the spring monomers being respectively connected to the first shell (1) and the built-in plate (5).

3. The protective device according to claim 2, characterized in that: The bottoms of two opposite side surfaces of the first shell (1) in the second direction (y) are respectively provided with abutment edges (12); The second shell (2) is provided with threaded holes on two opposite sides in the second direction (y); The regulating component (4) comprises: An adjusting rod (41) passes through the wall of the second shell (2) and is threadedly connected to the corresponding threaded hole; a linkage block (42), which is an adjustment end of the adjustment component (4) and is connected to the end of the adjustment rod (41) located in the second cavity (22); the linkage block (42) is located on the top side of the abutting edge (12) and is configured as a long strip structure for pressing the abutting edge (12); and An adjustment handle (43) is mounted on the end of the adjustment rod (41) located outside the second shell (2).

4. The protection device according to claim 3, characterized in that: When the adjustment handle (43) is rotated to adjust the linkage block (42) to be parallel to the abutting edge (12), the first shell (1) pops out of the second shell (2) under the elastic force of the elastic component.

5. The protection device according to claim 4, characterized in that: Two end surfaces of the linkage block (42) are in active contact with the first shell (1) and the second shell (2) respectively; The adjacent side surfaces of the linkage block (42) are smoothly transitioned.

6. The protection device according to claim 3, characterized in that: The outer side surface of the shell wall of the second shell (2) opposite to the second direction (y) is provided with a groove (23); The adjusting handle (43) is embedded in the groove (23) and can rotate in the groove (23).

7. The protection device according to claim 1, characterized in that: A top cover (13) is provided on the top of the first shell (1) for covering the side of the second shell (2) where the second opening (21) is located; The top cover (13) is provided with a positive terminal (131) and a negative terminal (132), which are respectively used to connect the positive electrode tab and the negative electrode tab of the battery body (6).

8. The protection device according to claim 7, characterized in that: A limit slot (24) is provided on the end surface of the shell wall of the second shell (2) located on the same side as the second opening (21); The outer periphery of the bottom surface of the top cover (13) is provided with a limiting clamping strip corresponding to and matching the limiting clamping groove (24).

9. The protection device according to claim 1, characterized in that: The outer side surface of the shell wall of the first shell (1) is provided with a flexible protective layer.

10. A lithium battery pack, characterized in that: include: Battery body (6); According to the protective device as claimed in any one of claims 1 to 9, the battery body (6) is placed in the first cavity (11) of the first shell (1) of the protective device.

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