An explosion-proof lithium battery

Abstract

The application discloses an explosion-proof lithium battery, which comprises a shell and a cover plate, an electrode cap is installed on the cover plate, a partition plate is arranged in the shell and divides an inner cavity of the shell into a first chamber and a second chamber, the first chamber is used for storing an electric core and electrolyte of the battery, an exhaust valve and a gas storage chamber are arranged in the second chamber, the electric core comprises an electrode column extending into the gas storage chamber, a diaphragm which deforms with pressure is arranged in the gas storage chamber, a power supply switch for connecting or disconnecting the electrode cap and the electrode column is arranged on the diaphragm, the exhaust valve comprises a first valve core between the first chamber and the gas storage chamber and a second valve core for exhausting gas in the gas storage chamber, gas in the first chamber in an overcharged state enters the gas storage chamber, the diaphragm deforms, the movement of the power supply switch is driven, the electrode cap is connected or disconnected with the electrode column, the power supply from an external power supply to the lithium battery is blocked, and the safety of the lithium battery during charging is improved, and explosion of the lithium battery is prevented.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular, to an explosion-proof lithium battery. Background Technology

[0002] Lithium batteries are a type of battery that we often encounter in daily life. They have the advantages of low pollution and large energy storage capacity. With the development of science and technology, lithium batteries have become the mainstream and commonly used batteries.

[0003] Lithium batteries expand during charging and discharging. If this internal expansion becomes uncontrolled, an explosion can occur. In practical applications, while battery protection boards can control the charging and discharging process, reducing battery expansion and improving safety, overcharging can still cause gas buildup inside the battery. This gas accumulation leads to further expansion, and if the battery is not disconnected in time, an explosion can still occur.

[0004] An existing patent for an overcharge-proof explosion-proof lithium battery, published under the number CN114937825A, uses a return mechanism to promptly push the sliding mechanism when the battery expands due to overcharging, thus pushing out the charging plug to cut off the power supply and reducing the possibility of battery explosion.

[0005] In the aforementioned patent, the return mechanism and sliding mechanism occupy a significant amount of space inside the battery, which is detrimental to increasing the battery's energy storage capacity. When the return mechanism starts operating, gas is already generated inside the battery, causing it to expand. The patent lacks a mechanism to release this expanded gas, resulting in the battery remaining in an expanded state. In this case, the battery should be scrapped, failing to maximize the utilization of the lithium battery and wasting resources.

[0006] Therefore, how to design an explosion-proof lithium battery that can expel the gas inside the battery has become a technical problem that urgently needs to be solved by people in this field. Summary of the Invention

[0007] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide an explosion-proof lithium battery that solves the problems of continuous charging during battery overcharging and the discharge of internal expansion gas.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An explosion-proof lithium battery includes a casing and a cover plate mounted on the upper side of the casing. An electrode cap is mounted on the cover plate. The casing has an internal partition plate dividing its interior into a first chamber and a second chamber. The first chamber stores the battery cell and electrolyte. The second chamber contains an exhaust valve and a gas storage chamber for storing gas inside the first chamber. The battery cell includes an electrode post extending into the gas storage chamber. The gas storage chamber has a diaphragm that deforms with pressure. A power switch is mounted on the diaphragm to connect or disconnect the electrode cap and electrode post. The exhaust valve includes a first valve core located between the first chamber and the gas storage chamber and a second valve core for venting gas from the gas storage chamber. In the initial state, both the first and second valve cores are closed, and the electrode cap and electrode post are connected via the power switch. In the overcharge state, the first valve core is open, the second valve core is closed, and the power switch disconnects the electrode cap and electrode post. In the venting state, the first valve core is closed, and the second valve core is open.

[0010] Furthermore, the power supply switch includes a guide sleeve and a conductive plate. The guide sleeve is fixedly installed on the diaphragm, and the conductive plate is fixedly installed on the inner wall of the guide sleeve and blocks the communication between the two ends of the guide sleeve. The electrode post is slidably connected to the guide sleeve, and the conductive plate is electrically connected to the electrode cap.

[0011] Furthermore, a third spring is installed between the diaphragm and the cover plate. In the overcharged state, the third spring is compressed, and the electrode post is disconnected from the conductive sheet. In the venting state, the third spring is reset, and the electrode post abuts against the conductive sheet.

[0012] Furthermore, the longitudinal section of the conductive sheet is H-shaped.

[0013] Furthermore, the power supply switch also includes a conductive post, one end of which is fixedly connected to the electrode cap, and the other end is inserted into the guide sleeve and slidably connected to the inner wall of the conductive sheet.

[0014] Furthermore, the exhaust valve also includes a valve seat, a valve chamber, a valve stem, and an elastic component for resetting the valve stem. The valve seat is provided with an air inlet channel and an exhaust channel that connect the valve chamber to the gas storage chamber. The valve stem is located in the valve chamber and one end extends out of the cover plate. The first valve core is slidably connected to the valve stem and is used to block the air inlet channel. The second valve core is fixed on the valve stem and is used to block the exhaust channel.

[0015] Furthermore, the first valve core has a first valve core cavity inside, one end of the valve stem extends into the first valve core cavity, and a first spring is provided in the first valve core cavity. One end of the first spring is fixedly connected to the valve stem, and the other end abuts against the bottom wall of the first valve core cavity. In the initial state, the first spring is in a free state and the outer wall of the first valve core abuts against the inner wall of the valve chamber and blocks the air intake passage. In the overcharged state, the first spring is compressed, and the first valve core opens the air intake passage.

[0016] Furthermore, the elastic component includes a second spring, one end of which is fixedly connected to the outer wall of the valve stem, and the other end of which abuts against the cover plate.

[0017] Furthermore, an air intake pipe is installed between the valve chamber and the first chamber. One end of the air intake pipe extends into the first chamber, and the other end is inserted into the valve chamber. The outer wall of the air intake pipe abuts against the inner wall of the valve chamber.

[0018] Furthermore, a one-way valve is installed in the exhaust channel. When the one-way valve is opened, the gas in the gas storage chamber flows to the valve chamber.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention utilizes the gas inside the first chamber under overcharge state to enter the gas storage chamber, thereby causing the diaphragm to deform, driving the power supply switch to move, thereby disconnecting and connecting the electrode cap and the electrode post, blocking the external power supply to the lithium battery, thereby improving the safety of the lithium battery during charging and preventing the lithium battery from exploding.

[0020] In the uncharged state, the second valve core is opened and the first valve core is closed by controlling the exhaust valve, thereby venting the gas inside the gas storage chamber to the outside, solving the battery expansion problem and improving the battery life.

[0021] In the exhaust state, the first valve core is closed, preventing outside air from entering the first chamber. This prevents the outside gas from reacting chemically with the battery cell during charging and discharging, thus preventing the battery from spontaneously combusting or exploding. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a schematic diagram showing the closure of the first chamber of the present invention;

[0025] Figure 4 This is an exploded view of the exhaust valve of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the mounting base of the present invention;

[0027] Figure 6 This is a cross-sectional view of the present invention;

[0028] Figure 7 for Figure 6 A magnified structural diagram of A in the middle;

[0029] Figure 8 This is a cross-sectional view of the exhaust valve of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the present invention in the stopped charging state;

[0031] Figure 10 This is a schematic diagram of the structure of the present invention in the exhaust state.

[0032] In the diagram: 1. Shell; 101. First chamber; 102. Second chamber; 11. Support; 12. Isolation plate; 13. Cover plate; 131. Positive electrode cap; 132. Negative electrode cap; 2. Mounting base; 201. Gas storage chamber; 21. First channel; 22. Second channel; 23. Air inlet; 24. Air outlet; 3. Diaphragm; 31. Groove; 4. Exhaust valve; 40. Valve seat; 41. Valve chamber; 411. Limiting ring; 42. Air inlet; 43. 44. Exhaust port; 44. First valve core; 441. First valve core cavity; 442. First spring; 45. Second valve core; 46. Valve stem; 47. Pressing plate; 471. Support block; 48. Second spring; 49. One-way valve; 5. Guide sleeve; 51. Conductive sheet; 52. Conductive post; 6. Air vent; 7. Third spring; 8. Current collector; 81. Positive current collector; 82. Negative current collector; 9. Electrode post; 91. Positive post; 92. Negative post. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This embodiment provides an explosion-proof lithium battery, mainly used to solve the problem of lithium battery explosion under overcharge conditions, and can also discharge the gas generated under overcharge conditions, thereby extending the battery's service life.

[0035] like Figure 2 and Figure 3As shown, the system includes a housing 1, and a removable partition plate 12 is installed in the inner cavity of the housing 1; wherein, the partition plate 12 divides the inner cavity of the housing 1 into a first chamber 101 and a second chamber 102. In this embodiment, as shown... Figure 6 As shown, the first chamber 101 and the second chamber 102 are arranged vertically, with the first chamber 101 located on the lower side. The first chamber 101 is used to store the battery cells and electrolyte. The second chamber 102 is equipped with an exhaust valve 4 and a gas storage chamber 201 for storing the gas inside the first chamber 101.

[0036] To enable the detachable installation of the isolation plate 12, in this embodiment, as follows: Figure 3 As shown, a support seat 11 is fixedly provided on the side wall of the inner cavity of the housing 1, and the isolation plate 12 is placed on the support seat 11 and fixed by bolts.

[0037] In order to achieve the sealing of the first chamber 101, in this embodiment, as follows: Figure 3 As shown, an annular sealing ring is placed between the bearing seat 11 and the isolation plate 12, thereby enhancing the sealing performance of the first chamber 101.

[0038] To achieve the construction of the gas storage chamber 201, in this embodiment, as follows: Figure 2 , Figure 5 and Figure 6 As shown, a mounting base 2 is installed on the upper side of the isolation plate 12. The mounting base 2 has a second channel 22 that runs vertically through it. A diaphragm 3 is installed inside the second channel 22. The edge of the diaphragm 3 is seamlessly connected to the side wall of the second channel 22. At this time, a gas storage chamber 201 is formed between the side wall of the second channel 22, the diaphragm 3, and the isolation plate 12. The diaphragm 3 is made of flexible material. When the pressure inside the gas storage chamber 201 changes, the diaphragm 3 can deform.

[0039] When a lithium battery is overcharged, gas is generated at the cell location, which can easily cause the lithium battery to expand. In order to stop the charging of the lithium battery in an overcharged state in time, in this embodiment, such as... Figure 1 As shown, a cover plate 13 is installed on the housing 1, and an electrode cap 131 connected to an external power source is installed on the cover plate 13. Figure 7 As shown, the battery cell includes an electrode post 9 extending into the gas storage chamber 201. A power supply switch is installed on the diaphragm 3 for electrically connecting the electrode cap 131 and the electrode post 9. The exhaust valve 4 includes a first valve core 44, which is located between the gas storage chamber 201 and the first chamber 101 and is used to control the gas inside the first chamber 101 to enter the gas storage chamber 201.

[0040] With the above configuration, when the lithium battery is overcharged, gas is generated at the cell position inside the first chamber 101. At this time, the pressure inside the first chamber 101 increases, which in turn opens the first valve core 44. The gas inside the first chamber 101 then enters the gas storage chamber 201, relieving the pressure inside the first chamber 101. When the pressure inside the gas storage chamber 201 increases, the diaphragm 3 deforms and bulges upwards. Figure 9 As shown, this causes the position of the power supply switch to move. At this time, the power supply switch disconnects the power connection between the electrode post 9 and the electrode cap 131, stops the external power supply from charging the lithium battery, and can prevent the lithium battery from exploding in the event of overcharging.

[0041] To enable the installation of the power supply switch, in this embodiment, as follows: Figure 7 As shown, the power supply switch includes a guide sleeve 5 and a conductive sheet 51. The conductive sleeve 5 is fixed on the diaphragm 3, and the conductive sheet 51 is installed in the inner wall of the guide sleeve 5. The conductive sheet 51 seals both ends of the guide sleeve 5 to prevent gas inside the gas storage chamber 201 from flowing out through the guide sleeve 5. One end of the conductive sheet 51 is electrically connected to the electrode cap 131, and the electrode post 9 is inserted into the guide sleeve 5 and slidably connected to the guide sleeve 5.

[0042] To facilitate the deformation of the diaphragm 3, in this embodiment, as follows: Figure 7 and Figure 10 As shown, the diaphragm 3 has grooves 31. When the gas storage chamber 201 is filled with gas, the grooves 31 disappear, as... Figure 9 As shown, the groove 31 becomes visible after the gas inside the gas storage chamber 201 is discharged.

[0043] Since the electrical connection or disconnection between the electrode post 9 and the electrode cap 131 can only be achieved by moving the power supply switch when the diaphragm 3 deforms, in this embodiment, in order to enhance the stable lifting and lowering of the diaphragm 3 during deformation, such as... Figure 7 As shown, the longitudinal cross-section of the conductive sheet 51 is "H" shaped. When the power supply switch is closed, as... Figure 7 As shown, the electrode post 9 is inserted into the guide sleeve 5 and contacts the conductive sheet 51. When the power switch is turned on, as... Figure 9 As shown, the diaphragm 3 deforms, at which point the electrode post 9 breaks contact with the conductive sheet 51.

[0044] In order to ensure stable lifting and lowering of the diaphragm 3 when it deforms, in this embodiment, as follows: Figure 7As shown, the power supply switch also includes a conductive post 52, wherein one end of the conductive post 52 is fixedly connected to the electrode cap 13, and the other end of the conductive post 52 extends into the guide sleeve 5 and is slidably connected to the guide sleeve 5, wherein the conductive post 52 is electrically connected to the inner wall of the conductive sheet 51.

[0045] In this embodiment, as Figure 1 As shown, the electrode cap 13 includes a positive electrode cap 1311 and a negative electrode cap 1312, as... Figure 6 As shown, the battery cell also includes current collectors 8, wherein the current collectors 8 include a positive current collector 81 and a negative current collector 82, and the electrode posts 9 include a positive electrode post 91 and a negative electrode post 92. The positive current collectors 81 and the positive electrode post 91, and the negative current collectors 82 and the negative electrode post 92 are electrically connected by wires. A power supply switch is installed between the positive electrode post 91 and the positive cap 1311, and between the negative electrode post 92 and the negative cap 1312.

[0046] To achieve the reset of diaphragm 3 under exhaust conditions, in this embodiment, as follows: Figure 2 and Figure 7 As shown, a third spring 7 is installed between the diaphragm 3 and the cover plate 13. One end of the third spring 7 abuts against the diaphragm 3, and the other end abuts against the bottom wall of the cover plate 13. In the initial state, the third spring 7 is in a free state. In the overcharged state, the diaphragm 3 moves upward and compresses the third spring 7. In the exhaust state, the third spring 7 provides the diaphragm 3 with the power to reset.

[0047] To achieve the installation of the exhaust valve 4, in this embodiment, as follows: Figure 5 As shown, the mounting base 2 is also provided with a first channel 21 that runs vertically through it, such as... Figure 6 As shown, the exhaust valve 4 is installed in the first channel 21.

[0048] In this embodiment, as Figure 4 As shown, the exhaust valve 4 also includes a valve seat 40, a valve chamber 41, a valve stem 46, and an elastic component for resetting the valve stem 46, such as... Figure 4 and Figure 7As shown, the valve chamber 41 penetrates the upper and lower walls of the valve seat 40. The valve stem 46 is located inside the valve chamber 41 and extends upward through the cover plate 13. The outer wall of the valve seat 40 is provided with an air inlet 42 and an air outlet 43 communicating with the valve chamber 41. The mounting base 2 is provided with an air inlet 23 and an air outlet 24 communicating with the air storage chamber 201 and the first channel 21. The air inlet 42 and the air inlet 23 communicate to form an air intake channel, and the air outlet 43 and the air outlet 24 communicate to form an air exhaust channel. The first valve core 44 is slidably connected to the valve stem 46 to block the air intake channel, and the second valve core 45 is fixedly connected to the valve stem 46 to block the air exhaust channel.

[0049] In the initial state, such as Figure 7 As shown, the first valve core 44 and the second valve core 45 are in a closed state, sealing the intake and exhaust passages. In an overcharged state, as... Figure 9 As shown, the first valve core 44 is open, opening the intake passage, while the second valve core 45 is closed, blocking the exhaust passage. In the exhaust state, as... Figure 10 As shown, the first valve core 44 blocks the air intake passage, and the second valve core 45 opens the exhaust passage.

[0050] In order to achieve relative sliding between the first valve core 44 and the valve stem 46, in this embodiment, as follows: Figure 8 As shown, the first valve core 44 is provided with a first valve core cavity 441, the lower end of the valve stem 46 extends into the first valve core cavity 441, and a first spring 441 is installed in the first valve core cavity 441. One end of the first spring 441 is fixedly connected to the valve stem 46, and the other end abuts against the bottom wall of the first valve core cavity 441.

[0051] In order to enable the gas inside the first chamber 101 to automatically flow into the gas storage chamber 201, in the initial state, as follows: Figure 7 and Figure 8 As shown, the first spring 441 is in a free state, the outer wall of the first valve core 44 abuts against the inner wall of the valve chamber 41 and seals the air intake channel; gas is generated inside the first chamber 101, causing the internal pressure of the first chamber 101 to rise. At this time, the gas pushes the first valve core 44 upward and compresses the first spring 442. At this time, the first valve core 44 moves relative to the valve stem 46 and opens the air intake channel. At this time, the gas inside the first chamber 101 enters the gas storage chamber 201 autonomously.

[0052] The advantage of the sliding connection between the first valve core 44 and the valve stem 46 is that when the first valve core 44 opens the intake passage, the upward movement of the valve stem 46 is negligible, and the second valve core 45 can still block the exhaust passage, reducing the interference of the movement of the first valve core 44 on the second valve core 45.

[0053] In order to limit the position of the first valve core 44 during its upward movement, in this embodiment, as follows: Figure 7 As shown, a limiting ring 411 is fixedly provided on the inner wall of the valve chamber 44. The limiting ring 411 is located on the upper side of the first valve core 44. When the first valve core 44 opens the air intake channel, the top wall of the first valve core 44 abuts against the bottom wall of the limiting ring 411, thereby restricting the upward movement of the first valve core 44.

[0054] In order to achieve exhaust from the gas storage chamber 41, in this embodiment, as follows: Figure 9 As shown, when the valve stem 46 is pressed down, the second valve core 45 and the first valve core 44 move down together. At this time, the first valve core 44 closes the air intake channel, and the second valve core 45 opens the exhaust channel. The gas inside the gas storage chamber 201 flows to the valve chamber 41 through the second valve core 45 and flows outward, realizing the discharge of the gas inside the gas storage chamber 201.

[0055] When outside air enters the battery, the lithium battery cells react chemically with the outside air during charging and discharging, which can easily cause the battery to explode. To prevent outside air from entering the gas storage chamber 201 during the venting process, in this embodiment, as follows... Figure 7 As shown, a one-way valve 49 is installed inside the exhaust channel, which can only allow the gas inside the gas storage chamber 201 to be discharged outward.

[0056] In order to facilitate pressing the valve stem 46 downward, in this embodiment, a pressing plate 47 is fixedly connected to the end of the valve stem 46 extending from the cover plate 13, so that the valve stem 46 can be pressed downward easily through the pressing plate 47.

[0057] In order to achieve the reset of the valve stem 46, in this embodiment, as follows: Figure 7 and Figure 8 As shown, the elastic component is a second spring 48, wherein the second spring 48 is sleeved on the outside of the valve stem 46, one end of the second spring 48 abuts against the upper wall of the cover plate 13, and the other end abuts against the lower wall of the pressing plate 47.

[0058] To prevent the pressure plate 47 from blocking the valve chamber 41 when pressed down, in this embodiment, as follows: Figure 8As shown, a support block 471 is fixedly installed on the lower wall of the pressing plate 47. When the pressing plate 47 is pressed down, the support block 471 abuts against the cover plate 13, so that a gap is formed between the valve chamber 41 and the outside world, preventing the valve chamber 41 from being blocked by the pressing plate 47.

[0059] In order to divert the gas inside the first chamber 101 to the gas storage chamber 201, in this embodiment, as follows: Figure 7 As shown, an air intake pipe 6 is installed at the bottom of the valve chamber 41, and the other end of the air intake pipe 6 extends through the partition plate 12 into the first chamber 101.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An explosion-proof lithium battery, comprising a housing (1) and a cover plate (13) mounted on the upper side of the housing (1), wherein an electrode cap (131) is mounted on the cover plate (13), characterized in that: The housing (1) is provided with a partition plate (12) that divides the inner cavity of the housing (1) into a first chamber (101) and a second chamber (102). The first chamber (101) is used to store the battery cell and electrolyte. The second chamber (102) is equipped with an exhaust valve (4) and a gas storage chamber (201) for storing the gas inside the first chamber (101). The battery cell includes an electrode post (9) extending into the gas storage chamber (201). The gas storage chamber (201) is provided with a diaphragm (3) that deforms with pressure. The diaphragm (3) is equipped with a valve cap (131) for the electrode post (9) to be inserted. The power supply switch is turned on or off. The exhaust valve (4) includes a first valve core (44) located between the first chamber (101) and the gas storage chamber (201) and a second valve core (45) for venting the gas inside the gas storage chamber (201). In the initial state, both the first valve core (44) and the second valve core (45) are in the closed state, and the electrode cap (131) and the electrode post (9) are connected by the power supply switch. In the overcharge state, the first valve core (44) is open, the second valve core (45) is closed, and the power supply switch disconnects the connection between the electrode cap (131) and the electrode post (9). In the exhaust state, the first valve core (44) is closed, and the second valve core (45) is open.

2. The explosion-proof lithium battery according to claim 1, characterized in that: The power supply switch includes a guide sleeve (5) and a conductive sheet (51). The guide sleeve (5) is fixedly installed on the diaphragm (3). The conductive sheet (51) is fixedly installed on the inner wall of the guide sleeve (5) and blocks the communication between the two ends of the guide sleeve (5). The electrode post (9) is slidably connected to the guide sleeve (5). The conductive sheet (51) is electrically connected to the electrode cap (131).

3. The explosion-proof lithium battery according to claim 2, characterized in that: A third spring (7) is installed between the diaphragm (3) and the cover plate (13). In the overcharge state, the third spring (7) is compressed, and the electrode post (9) and the conductive sheet (51) are disconnected. In the exhaust state, the third spring (7) is reset, and the electrode post (9) and the conductive sheet (51) abut against each other.

4. The explosion-proof lithium battery according to claim 2, characterized in that: The longitudinal section of the conductive sheet (51) is "H" shaped.

5. The explosion-proof lithium battery according to claim 4, characterized in that: The power supply switch also includes a conductive post (52), one end of which is fixedly connected to the electrode cap (13), and the other end is inserted into the guide sleeve (5) and slidably connected to the inner wall of the conductive sheet (51).

6. The explosion-proof lithium battery according to claim 1, characterized in that: The exhaust valve (4) further includes a valve seat (40), a valve chamber (41), a valve stem (46), and an elastic component for resetting the valve stem (46). The valve seat (40) is provided with an air inlet channel and an exhaust channel that connect the valve chamber (41) and the gas storage chamber (201). The valve stem (46) is located inside the valve chamber (41) and one end protrudes through the cover plate (13). The first valve core (44) is slidably connected to the valve stem (46) and is used to block the air inlet channel. The second valve core (45) is fixed on the valve stem (46) and is used to block the exhaust channel.

7. The explosion-proof lithium battery according to claim 6, characterized in that: The first valve core (44) has a first valve core cavity (441) inside. One end of the valve stem (46) extends into the first valve core cavity (441). The first valve core cavity (441) is provided with a first spring (442). One end of the first spring (442) is fixedly connected to the valve stem (46), and the other end abuts against the bottom wall of the first valve core cavity (441). In the initial state, the first spring (442) is in a free state and the outer wall of the first valve core (44) abuts against the inner wall of the valve chamber (41) and blocks the air intake passage. In the overcharged state, the first spring (442) is compressed, and the first valve core (44) opens the air intake passage.

8. The explosion-proof lithium battery according to claim 6, characterized in that: The elastic component includes a second spring (48), one end of which is fixedly connected to the outer wall of the valve stem (46), and the other end of which abuts against the cover plate (13).

9. An explosion-proof lithium battery according to claim 6, characterized in that: An air intake pipe (6) is installed between the valve chamber (41) and the first chamber (101). One end of the air intake pipe (6) extends into the first chamber (101), and the other end is inserted into the valve chamber (41). The outer wall of the air intake pipe (6) abuts against the inner wall of the valve chamber (41).

10. An explosion-proof lithium battery according to claim 6, characterized in that: A one-way valve (49) is installed in the exhaust passage. When the one-way valve (49) is opened, the gas in the gas storage chamber (201) flows to the valve chamber (41).

Images