Lithium battery housing and lithium battery

Abstract

The utility model relates to a lithium battery shell and a lithium battery, wherein the lithium battery shell comprises a main shell having a cavity, a fixed cover plate covering the opening of the cavity, and a movable cover plate arranged in the cavity and located below the fixed cover plate, wherein the side wall of the cavity is provided with a first annular protrusion and a second annular protrusion, wherein the first annular protrusion and the second annular protrusion are spaced apart, and the end of the movable cover plate is inserted into the space between the first annular protrusion and the second annular protrusion. The utility model provides a lithium battery shell and a lithium battery, which realizes intelligent management of the internal pressure of the battery by ingeniously utilizing the interactive mechanism of the annular protrusion and the movable cover plate, and at the same time provides simple assembly and excellent sealing performance, thereby significantly improving the safety and reliability of the lithium battery.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, and in particular to a lithium battery shell and a lithium battery. Background Art

[0002] In the field of battery technology, effective management of internal pressure is one of the core challenges to ensure safe operation of batteries. If the imbalance of internal pressure in the battery is not properly controlled, it may cause serious safety accidents, such as battery overheating, fire or even explosion, posing a huge threat to people's life and property safety. Therefore, the development of an efficient internal pressure management solution is crucial to improving the overall performance and reliability of the battery. How to achieve effective management of the internal pressure of the battery is an important research direction for batteries. Utility Model Content

[0003] In view of this, the utility model provides a lithium battery casing, which achieves intelligent management of the internal pressure of the battery by cleverly utilizing the interactive mechanism of the annular protrusion and the movable cover, while providing simple assembly and excellent sealing performance, significantly improving the safety and reliability of the lithium battery.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A lithium battery shell comprises a main shell having a cavity, a fixed cover plate covering the opening of the cavity, and a movable cover plate arranged in the cavity and located below the fixed cover plate, wherein the side wall of the cavity is provided with a first annular protrusion and a second annular protrusion, the first annular protrusion and the second annular protrusion are distributed at intervals, and the end of the movable cover plate is inserted into the interval between the first annular protrusion and the second annular protrusion.

[0006] The side wall of the cavity is designed with a first annular protrusion and a second annular protrusion, which not only enhances the overall strength of the shell, but also provides a clear support point for the movable cover. The end of the movable cover is designed to be snapped into the gap between the first annular protrusion and the second annular protrusion. This snap-on method is both stable and flexible, allowing the movable cover to move when necessary to adapt to changes in internal pressure. When the internal pressure of the battery exceeds the design limit, the movable cover will move toward the fixed cover under pressure. Due to the snap-on structure between the movable cover and the first annular protrusion and the second annular protrusion, this movement will gradually open the pressure relief channel, thereby effectively releasing excessive pressure and preventing the battery from rupturing or other safety accidents due to excessive internal pressure. In addition, this design also takes into account the convenience of assembly. The snap-on mechanism of the movable cover allows it to be installed quickly and accurately without the use of additional tools or complicated assembly steps. This simple assembly process not only reduces production costs, but also improves production efficiency. From the perspective of sealing performance, the snap-fit ​​structure between the movable cover plate and the first annular protrusion and the second annular protrusion forms an effective sealing interface, preventing leakage of gas and liquid, and ensuring safe operation of the battery under various environmental conditions.

[0007] In general, this lithium battery shell design achieves intelligent management of the internal pressure of the battery by cleverly utilizing the interactive mechanism of the annular protrusion and the movable cover, while providing simple assembly and excellent sealing performance, significantly improving the safety and reliability of the lithium battery. This design not only reflects a deep understanding of battery performance requirements, but also demonstrates the spirit of continuous innovation in the field of battery technology.

[0008] Preferably, a compression spring is connected between the movable cover plate and the fixed cover plate, a first conductive column is connected to the fixed cover plate, and a second conductive column is connected to the movable cover plate, and the first conductive column and the second conductive column are electrically connected via a wire.

[0009] The compression spring between the movable cover and the fixed cover plays a dual role. First, it provides the necessary pressure to ensure that the movable cover is always tightly stuck in the gap between the first annular protrusion and the second annular protrusion, thereby ensuring the sealing performance of the shell. Secondly, the elastic characteristics of the compression spring enable the movable cover to move flexibly when the internal pressure of the battery changes, achieving a dynamic balance of pressure. This design not only improves the sealing of the shell, but also enhances its adaptability to pressure fluctuations inside the battery. The design of the first conductive column and the second conductive column ensures the smooth flow of current. Through the electrical connection of the wires, they realize the integrity of the internal circuit of the battery and provide a guarantee for the normal operation of the battery. This design simplifies the circuit connection process, reduces the potential risk of poor contact, and improves the reliability of the circuit.

[0010] Preferably, the distance between the first annular protrusion and the second annular protrusion is equal to a preset value A, and the preset value A is smaller than the thickness of the movable cover plate.

[0011] The spacing between the first annular protrusion and the second annular protrusion is designed to be a preset value A, which is less than the thickness of the movable cover. This design has several significant advantages. First, it ensures that the movable cover has sufficient pre-tightening force when it is clamped, thereby providing a good sealing effect. Second, this preset spacing allows the movable cover to have a certain amount of movement space under pressure, so that when the internal pressure of the battery is too high, the movable cover can move along the predetermined path to effectively release the pressure without being damaged due to excessive squeezing.

[0012] Preferably, an upper inclined surface and a lower inclined surface are formed at the end of the movable cover plate, the upper inclined surface contacts the first annular protrusion, and the lower inclined surface contacts the second annular protrusion.

[0013] The upper and lower inclined surfaces at the ends of the movable cover are designed to match the first ring and the second ring. This design further optimizes the clamping mechanism of the movable cover. The upper inclined surface contacts the first annular protrusion, and the lower inclined surface contacts the second annular protrusion. This design not only ensures the stability of the movable cover when clamping, but also guides it to move correctly along the predetermined path when the movable cover moves to release pressure, avoiding the occurrence of jamming or misalignment. In addition, this design also reduces the wear between the movable cover and the fixed cover, and prolongs the service life of the shell.

[0014] Preferably, the first annular protrusion is located above the second annular protrusion, and a third annular protrusion is also arranged above the first annular protrusion, and the distance between the first annular protrusion and the third annular protrusion is equal to a preset value A.

[0015] The position of the first annular protrusion is arranged directly above the second annular protrusion, forming a stable support point, and also plays a guiding role, ensuring that the movable cover can be smoothly clamped and fixed below it. This layout not only enhances the overall stability of the structure, but also effectively prevents the cover from loosening or falling off due to external impact or internal pressure fluctuations in practical applications, thereby improving the reliability and safety of the system. It is worth noting that a third annular protrusion is specially arranged above the first annular protrusion. A precise preset spacing A is maintained between the two protrusions. This design detail not only gives the structure a beautiful sense of hierarchy, but more importantly, it plays a key role in function. When the pressure in the cavity exceeds the design limit, the movable cover will move toward the fixed cover under the action of pressure to achieve pressure relief. The moving path of the movable cover during the pressure relief process has also been carefully designed. It first moves upward from the gap between the first annular protrusion and the second annular protrusion to the gap between the first annular protrusion and the third annular protrusion. The sealing performance of the movable cover in the new stable position is also guaranteed, ensuring the stability of the internal environment of the cavity.

[0016] Preferably, a fourth annular protrusion is further provided below the second annular protrusion, and a distance between the second annular protrusion and the fourth annular protrusion is equal to a preset value A.

[0017] The newly added fourth annular protrusion below the second annular protrusion adds an extra layer of stability and adjustment capability to the entire system. This design takes into account the bidirectional nature of pressure changes. It can not only cope with the pressure relief needs when the pressure increases, but also provide the necessary support when the pressure decreases, thereby ensuring that the movable cover plate can remain in the optimal position under any circumstances. The preset spacing A between the second annular protrusion and the fourth annular protrusion is not only an important structural feature, but also a key factor in the realization of the function. The setting of this distance allows the movable cover plate to have enough space to move in the opposite direction when the internal pressure decreases. When the internal pressure decreases, the movable cover plate will move toward the fourth annular protrusion under the action of elastic force, thereby filling the space created by the pressure drop and maintaining the pressure balance inside the cavity.

[0018] Preferably, a limiting convex ring is arranged above the third annular protrusion, and the distance between the third annular protrusion and the limiting convex ring is equal to a preset value A.

[0019] A limiting convex ring is arranged above the third annular protrusion, and the convexity of the limiting convex ring is designed to be larger than that of the annular protrusion, which makes it play a decisive limiting role in the movement of the movable cover. When the movable cover moves due to the change of internal pressure and breaks through the third annular protrusion, the limiting convex ring will contact it to prevent it from continuing to move outward, thereby preventing the movable cover from rushing out of the cavity under the action of high pressure.

[0020] Preferably, the fixed cover plate is provided with a first mounting through hole, the first conductive column is fixed to the first mounting through hole, the movable cover plate is provided with a second mounting through hole, and the second conductive column is fixed to the second mounting through hole.

[0021] The first mounting through hole on the fixed cover and the second mounting through hole on the movable cover provide precise mounting positions for the first conductive column and the second conductive column. This design ensures that the conductive column can be firmly fixed in the corresponding through hole, avoiding loosening due to vibration or impact, thereby improving the reliability of the electrical connection. At the same time, the design of the through hole also takes into account the need for easy installation and disassembly, making it more convenient and quick to maintain and replace the conductive column.

[0022] Preferably, the fixed cover plate is provided with a first slot, the movable cover plate is provided with a second slot, and one end of the compression spring is clamped in the first slot, and the other end is clamped in the second slot.

[0023] The arrangement of the first slot on the fixed cover and the second slot on the movable cover, as well as the use of the compression spring, provide a mechanical advantage for positioning and fixing the movable cover. The elastic action of the compression spring ensures that the movable cover can maintain a stable position when subjected to internal pressure changes, while also allowing a certain range of displacement to adapt to pressure changes. This design not only improves the sealing performance of the system, but also reduces wear and damage caused by pressure fluctuations.

[0024] Another aspect of the present invention provides a lithium battery, comprising the lithium battery casing as described above.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] In the lithium battery housing of the utility model, the first annular protrusion and the second annular protrusion are designed on the side wall of the cavity, which not only enhances the overall strength of the housing, but also provides a clear support point for the movable cover. The end of the movable cover is designed to be snapped into the interval between the first annular protrusion and the second annular protrusion. This snap-on method is both stable and flexible, allowing the movable cover to move when necessary to adapt to changes in internal pressure. When the internal pressure of the battery exceeds the design limit, the movable cover will move toward the fixed cover under the action of pressure. Due to the snap-on structure of the movable cover and the first annular protrusion and the second annular protrusion, this movement will gradually open the pressure relief channel, thereby effectively releasing excessive pressure and avoiding the battery from rupture or other safety accidents due to excessive internal pressure. In addition, this design also takes into account the convenience of assembly. The snap-on mechanism of the movable cover allows it to be installed quickly and accurately without the use of additional tools or complicated assembly steps. This simple assembly process not only reduces production costs, but also improves production efficiency. From the perspective of sealing performance, the snap-fit ​​structure between the movable cover plate and the first annular protrusion and the second annular protrusion forms an effective sealing interface, preventing leakage of gas and liquid, and ensuring safe operation of the battery under various environmental conditions.

[0027] In general, this lithium battery shell design achieves intelligent management of the internal pressure of the battery by cleverly utilizing the interactive mechanism of the annular protrusion and the movable cover, while providing simple assembly and excellent sealing performance, significantly improving the safety and reliability of the lithium battery. This design not only reflects a deep understanding of battery performance requirements, but also demonstrates the spirit of continuous innovation in the field of battery technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a structural diagram of a lithium battery housing according to an embodiment of the present utility model.

[0030] Figure 2 for Figure 1 Magnified view of area A.

[0031] Figure 3 for Figure 2 Magnified view of area B. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 application.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0036] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0037] The present embodiment provides a lithium battery shell, including a main shell 100 having a cavity, a fixed cover plate 200 covering the opening of the cavity, and a movable cover plate 300 arranged in the cavity and located below the fixed cover plate 200. The side wall of the cavity is provided with a first annular protrusion 110 and a second annular protrusion 120, and the first annular protrusion 110 and the second annular protrusion 120 are distributed at intervals, and the end of the movable cover plate 300 is stuck in the interval between the first annular protrusion 110 and the second annular protrusion 120.

[0038] The side wall of the cavity is designed with a first annular protrusion 110 and a second annular protrusion 120, which not only enhances the overall strength of the shell, but also provides a clear support point for the movable cover 300. The end of the movable cover 300 is designed to be snapped into the gap between the first annular protrusion 110 and the second annular protrusion 120. This snap-on method is both stable and flexible, allowing the movable cover 300 to move when necessary to adapt to changes in internal pressure. When the internal pressure of the battery exceeds the design limit, the movable cover 300 will move toward the fixed cover 200 under the action of pressure. Due to the snap-on structure between the movable cover 300 and the first annular protrusion 110 and the second annular protrusion 120, this movement will gradually open the pressure relief channel, thereby effectively releasing excessive pressure and preventing the battery from rupturing or other safety accidents due to excessive internal pressure. In addition, this design also takes into account the convenience of assembly. The snap-on mechanism of the movable cover 300 allows it to be quickly and accurately installed without the use of additional tools or complicated assembly steps. This simple assembly process not only reduces production costs, but also improves production efficiency. From the perspective of sealing performance, the snap-fit ​​structure of the movable cover plate 300 and the first annular protrusion 110 and the second annular protrusion 120 forms an effective sealing interface, preventing gas and liquid leakage, and ensuring the safe operation of the battery under various environmental conditions.

[0039] In general, this lithium battery housing design achieves intelligent management of the internal pressure of the battery by cleverly utilizing the interaction mechanism of the annular protrusion and the movable cover 300, while providing simple assembly and excellent sealing performance, significantly improving the safety and reliability of the lithium battery. This design not only reflects a deep understanding of battery performance requirements, but also demonstrates the spirit of continuous innovation in the field of battery technology.

[0040] In this embodiment, a compression spring 400 is connected between the movable cover plate 300 and the fixed cover plate 200 , a first conductive column 210 is connected to the fixed cover plate 200 , a second conductive column 310 is connected to the movable cover plate 300 , and the first conductive column 210 and the second conductive column 310 are electrically connected via a wire 410 .

[0041] The compression spring 400 between the movable cover plate 300 and the fixed cover plate 200 plays a dual role. First, it provides the necessary pressure to ensure that the movable cover plate 300 is always tightly stuck in the gap between the first annular protrusion 110 and the second annular protrusion 120, thereby ensuring the sealing performance of the shell. Secondly, the elastic characteristics of the compression spring 400 enable the movable cover plate 300 to move flexibly when the internal pressure of the battery changes, thereby achieving a dynamic balance of pressure. This design not only improves the sealing of the shell, but also enhances its adaptability to pressure fluctuations inside the battery. The design of the first conductive column 210 and the second conductive column 310 ensures the smooth flow of current. Electrically connected by the wire 410, they realize the integrity of the internal circuit of the battery and provide a guarantee for the normal operation of the battery. This design simplifies the circuit connection process, reduces the potential risk of poor contact, and improves the reliability of the circuit.

[0042] In this embodiment, the distance between the first annular protrusion 110 and the second annular protrusion 120 is equal to a preset value A, and the preset value A is smaller than the thickness of the movable cover plate 300 .

[0043] The spacing between the first annular protrusion 110 and the second annular protrusion 120 is designed to be a preset value A, which is less than the thickness of the movable cover plate 300. This design has several significant advantages. First, it ensures that the movable cover plate 300 has sufficient pre-tightening force when it is clamped, thereby providing a good sealing effect. Second, this preset spacing allows the movable cover plate 300 to have a certain amount of movement space under pressure, so that when the internal pressure of the battery is too high, the movable cover plate 300 can move along a predetermined path to effectively release pressure without being damaged due to excessive squeezing.

[0044] In this embodiment, an upper inclined surface 320 and a lower inclined surface 330 are formed at the end of the movable cover plate 300 . The upper inclined surface 320 contacts the first annular protrusion 110 , and the lower inclined surface 330 contacts the second annular protrusion 120 .

[0045] The upper inclined surface 320 and the lower inclined surface 330 at the end of the movable cover plate 300 are designed to be inclined surfaces that match the first ring and the second ring. This design further optimizes the clamping mechanism of the movable cover plate 300. The upper inclined surface 320 contacts the first annular protrusion 110, and the lower inclined surface 330 contacts the second annular protrusion. This design not only ensures the stability of the movable cover plate 300 during clamping, but also guides it to move correctly along the predetermined path when the movable cover plate 300 moves to release pressure, avoiding the occurrence of jamming or misalignment. In addition, this design also reduces the wear between the movable cover plate 300 and the fixed cover plate 200, and prolongs the service life of the shell.

[0046] In this embodiment, the first annular protrusion 110 is located above the second annular protrusion 120 . A third annular protrusion 130 is also disposed above the first annular protrusion 110 . The distance between the first annular protrusion 110 and the third annular protrusion 130 is equal to a preset value A.

[0047] The position of the first annular protrusion 110 is arranged directly above the second annular protrusion 120, forming a stable support point, and also plays a guiding role, ensuring that the movable cover plate 300 can be smoothly snapped and fixed below it. This layout not only enhances the overall stability of the structure, but also effectively prevents the cover plate from loosening or falling off due to external impact or internal pressure fluctuations in practical applications, thereby improving the reliability and safety of the system. It is worth noting that a third annular protrusion 130 is specially arranged above the first annular protrusion 110. A precise preset spacing A is maintained between the two protrusions. This design detail not only gives the structure a beautiful sense of hierarchy, but more importantly, it plays a key role in function. When the pressure in the cavity exceeds the design limit, the movable cover plate 300 will move toward the fixed cover plate 200 under the action of pressure, thereby achieving pressure relief. The moving path of the movable cover plate 300 during the pressure relief process has also been carefully designed. It first moves upward from the gap between the first annular protrusion 110 and the second annular protrusion 120 to the gap between the first annular protrusion 110 and the third annular protrusion 130. The sealing performance of the movable cover plate 300 in the new stable position is also guaranteed, ensuring the stability of the internal environment of the cavity.

[0048] In this embodiment, a fourth annular protrusion 140 is further disposed below the second annular protrusion 120 , and a distance between the second annular protrusion 120 and the fourth annular protrusion 140 is equal to a preset value A.

[0049] The newly added fourth annular protrusion 140 below the second annular protrusion 120 adds an extra layer of stability and adjustment capability to the entire system. This design takes into account the bidirectional nature of pressure changes, and can not only cope with the pressure relief needs when the pressure increases, but also provide the necessary support when the pressure decreases, thereby ensuring that the movable cover plate 300 can remain in the optimal position under any circumstances. The preset spacing A between the second annular protrusion and the fourth annular protrusion 140 is not only an important structural feature, but also a key factor in the realization of the function. The setting of this distance allows the movable cover plate 300 to have enough space to move in the opposite direction when the internal pressure decreases. When the internal pressure decreases, the movable cover plate 300 will move toward the fourth annular protrusion 140 under the action of the elastic force, thereby filling the space created by the pressure drop and maintaining the pressure balance inside the cavity.

[0050] In this embodiment, a limiting protrusion 150 is disposed above the third annular protrusion 130 , and the distance between the third annular protrusion 130 and the limiting protrusion 150 is equal to a preset value A.

[0051] A limiting protrusion ring 150 is arranged above the third annular protrusion 130. The protrusion of the limiting protrusion ring 150 is designed to be larger than the annular protrusion. This feature enables it to play a decisive limiting role in the movement of the movable cover plate 300. When the movable cover plate 300 moves due to changes in internal pressure and breaks through the third annular protrusion 130, the limiting protrusion ring 150 will contact it to prevent it from continuing to move outward, thereby preventing the movable cover plate 300 from rushing out of the cavity under the action of high pressure.

[0052] In this embodiment, the fixed cover plate 200 is provided with a first mounting through hole 220 , the first conductive column 210 is fixed to the first mounting through hole 220 , and the movable cover plate 300 is provided with a second mounting through hole 340 , the second conductive column 310 is fixed to the second mounting through hole 340 .

[0053] The first mounting through hole 220 on the fixed cover plate 200 and the second mounting through hole 340 on the movable cover plate 300 provide precise mounting positions for the first conductive column 210 and the second conductive column 310. This design ensures that the conductive column can be firmly fixed in the corresponding through hole, avoiding loosening due to vibration or impact, thereby improving the reliability of the electrical connection. At the same time, the design of the through hole also takes into account the need for easy installation and disassembly, making it more convenient and quick to maintain and replace the conductive column.

[0054] In this embodiment, the fixed cover plate 200 is provided with a first slot 230 , the movable cover plate 300 is provided with a second slot 350 , and one end of the compression spring 400 is clamped in the first slot 230 , and the other end is clamped in the second slot 350 .

[0055] The arrangement of the first slot 230 on the fixed cover plate 200 and the second slot 350 on the movable cover plate 300, as well as the application of the compression spring 400, provide a mechanical advantage for the positioning and fixing of the movable cover plate 300. The elastic effect of the compression spring 400 ensures that the movable cover plate 300 can maintain a stable position when subjected to internal pressure changes, while also allowing displacement within a certain range to adapt to pressure changes. This design not only improves the sealing performance of the system, but also reduces wear and damage caused by pressure fluctuations.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery housing, characterized in that: It includes a main shell body with a cavity, a fixed cover plate covering the opening of the cavity, and a movable cover plate arranged in the cavity and located below the fixed cover plate. The side wall of the cavity is provided with a first annular protrusion and a second annular protrusion, the first annular protrusion and the second annular protrusion are distributed at intervals, and the end of the movable cover plate is inserted into the interval between the first annular protrusion and the second annular protrusion.

2. The lithium battery housing according to claim 1, characterized in that: A compression spring is connected between the movable cover plate and the fixed cover plate, a first conductive column is connected to the fixed cover plate, and a second conductive column is connected to the movable cover plate. The first conductive column and the second conductive column are electrically connected through a wire.

3. The lithium battery housing according to claim 2, characterized in that: The distance between the first annular protrusion and the second annular protrusion is equal to a preset value A, and the preset value A is smaller than the thickness of the movable cover plate.

4. The lithium battery housing according to claim 3, characterized in that: An upper inclined surface and a lower inclined surface are formed at the end of the movable cover plate. The upper inclined surface contacts the first annular protrusion, and the lower inclined surface contacts the second annular protrusion.

5. The lithium battery casing according to claim 4, characterized in that: The first annular protrusion is located above the second annular protrusion. A third annular protrusion is also arranged above the first annular protrusion. The distance between the first annular protrusion and the third annular protrusion is equal to a preset value A.

6. The lithium battery casing according to claim 5, characterized in that: A fourth annular protrusion is further disposed below the second annular protrusion, and a distance between the second annular protrusion and the fourth annular protrusion is equal to a preset value A.

7. The lithium battery casing according to claim 6, characterized in that: A limiting convex ring is arranged above the third annular protrusion, and the distance between the third annular protrusion and the limiting convex ring is equal to a preset value A.

8. The lithium battery casing according to claim 2, characterized in that: The fixed cover plate is provided with a first mounting through hole, the first conductive column is fixed to the first mounting through hole, the movable cover plate is provided with a second mounting through hole, the second conductive column is fixed to the second mounting through hole.

9. The lithium battery casing according to claim 2, characterized in that: The fixed cover plate is provided with a first clamping slot, the movable cover plate is provided with a second clamping slot, one end of the compression spring is clamped in the first clamping slot, and the other end is clamped in the second clamping slot.

10. A lithium battery, characterized in that: Comprising a lithium battery casing as described in any one of claims 1 to 9.

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