High-safety lithium ion battery with overload protection device

Abstract

The invention discloses a high-safety lithium ion battery with an overload protection device, and particularly relates to the technical field of lithium batteries, the high-safety lithium ion battery comprises a battery shell, the lower end of the battery shell is fixedly connected with a positive pole, the upper end of the battery shell is fixedly connected with an overload protection structure, and the upper end of the overload protection structure and an inner cavity of the overload protection structure are jointly provided with a negative pole. According to the high-safety lithium ion battery with the overload protection device, the groove in the negative electrode lower cover plate and the negative electrode upper cover plate welding fixing box are arranged, so that the internal structure is compact and stable, and the space is effectively utilized; the fuse is wrapped by the polymer film, spark splashing at the fusing moment is prevented, and the safety is enhanced; the current sequentially passes through the negative upper pole, the overload protection assembly and the negative lower pole, and the design of the sealing ring I, the sealing ring II and the multi-layer insulating plate is combined, so that the current transmission is orderly and safe, electric leakage and short circuit are avoided, and the battery reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and particularly relates to a high-safety lithium-ion battery with an overload protection device. Background Art

[0002] With the wide application of power batteries in many fields such as electric vehicles and energy storage systems, their safety has received increasing attention; traditional safety protection methods have many deficiencies, for example, the response speed and accuracy are difficult to meet the increasingly stringent requirements.

[0003] Chinese Patent Publication No. CN102292856B discloses a lithium-ion battery. The lithium-ion battery maintains the flame retardancy of the electrolyte over a long period, has a high energy density, and has improved charge / discharge cycle characteristics, high-temperature storage characteristics, and rate characteristics; the lithium-ion battery is a lithium-ion battery including the following: an electrolyte containing at least an ionic liquid and a lithium salt, a positive electrode, and a negative electrode, characterized in that the negative electrode contains an active material, and the active material is a carbon material treated with a surface treatment agent.

[0004] However, during daily use, lithium power batteries may face various abnormal situations, such as external circuit short circuits, internal cell failures, etc. These situations are extremely likely to cause overcurrent phenomena, which in turn lead to battery overheating, fire, or even explosion, posing a serious threat to the safety of equipment and personnel. Summary of the Invention

[0005] The main object of the present invention is to provide a high-safety lithium-ion battery with an overload protection device, which can effectively solve the problem that the insufficient safety protection method of the existing device leads to cell failures and even overheating and fire.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A high-safety lithium-ion battery with an overload protection device includes a battery housing. A positive electrode post is fixedly connected to the lower end of the battery housing, and an overload protection structure is fixedly connected to the upper end of the battery housing. A negative electrode post is provided at the upper end and inside the overload protection structure. An electrochemical cell is arranged inside the battery housing, and the negative electrode post and the positive electrode post are respectively connected to the negative electrode and the positive electrode of the electrochemical cell.

[0008] Preferably, the overload protection structure includes a negative electrode lower cover plate fixedly connected to the upper end of the battery housing. A groove is formed in the upper end of the negative electrode lower cover plate, and a negative electrode upper cover plate is fixedly connected to the inner surface of the groove. A plastic plate one is fixedly connected to the lower end of the negative electrode lower cover plate, and the lower end of the plastic plate one is closely attached to the upper end of the cell.

[0009] Preferably, a first sealing ring is fixedly connected to the inner surface of the lower cover plate of the negative electrode and the inner surface of the first plastic plate. A through hole communicating with its inner cavity is formed in the upper end of the upper cover plate of the negative electrode, and a second sealing ring is fixedly connected to the inner surface of the through hole.

[0010] Preferably, the negative electrode column includes an upper negative electrode post and a lower negative electrode post. The second sealing ring is sleeved on the outer surface of the upper negative electrode post. The upper negative electrode post is T-shaped, and an annular notch is formed on the outer surface of its horizontal part. The inner surface of the annular notch of the upper negative electrode post is fixedly connected to the upper end and the inner surface top wall of the upper cover plate of the negative electrode respectively. The first sealing ring is arranged between the inner surface of the annular notch of the lower negative electrode post and the inner surface of the through hole on the upper cover plate of the negative electrode. The lower negative electrode post is I-shaped, and a second plastic plate sleeved on the outer surface of the vertical part of the lower negative electrode post is fixedly connected to the lower end of the upper side plane part thereof. The lower end of the second plastic plate is fixedly connected to the upper end of the lower cover plate of the negative electrode. An overload protection component is jointly arranged at the lower end of the upper negative electrode post and the upper end of the lower negative electrode post.

[0011] Preferably, the overload protection component includes a fusing part fixedly connected to the lower end of the upper negative electrode post and the upper end of the lower negative electrode post in a Z shape. Two wax rods are fixedly connected symmetrically along the axis of the fusing part at the mutually approaching ends of the upper negative electrode post and the lower negative electrode post. An auxiliary rod is jointly arranged on the inner surfaces of the two wax rods. Elastic pull ropes are symmetrically and fixedly connected to the outer surface of the auxiliary rod along the wax rods. The two ends of each elastic pull rope far away from the auxiliary rod are fixedly connected to the upper end of the lower negative electrode post by rivets.

[0012] Preferably, the fusing part includes an alloy fusing wire. Conductive sheets are fixedly connected to the upper end of the alloy fusing wire where it is connected to the upper negative electrode post and the lower end where it is connected to the lower negative electrode post respectively. The outer surface of the alloy fusing wire is coated with a polymer film except at the positions where the two conductive sheets are located.

[0013] Preferably, both of the two wax rods are in contact with the outer surface of the fusing part and wrap the fusing part inside.

[0014] Preferably, the auxiliary rod is horizontally placed on the upper part of the fusing part and its outer surface is wrapped inside by the two wax rods on both sides.

[0015] Preferably, the elastic pull rope is made of an elastic material and its two ends are not on the same vertical line. The elastic pull rope is in a taut state in the initial state.

[0016] Preferably, the alloy fusing wire is made of a copper-silver alloy with a purity of 99.99%, in which the mass ratio of copper to silver is 85:15. The melting point of the alloy fusing wire is 720 °C, and the fusing current accuracy is controlled within ±5%;

[0017] The polymer film is a 0.05 mm polytetrafluoroethylene (PTFE) film;

[0018] Both the second plastic plate and the first plastic plate are made of PPS plastic resistant to electrolytic corrosion;

[0019] Both the first sealing ring and the second sealing ring are made of rubber material, and the insulation resistance is 1012Ω.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By setting the groove on the negative lower cover plate and the welding fixing box on the negative upper cover plate, the present invention realizes a compact and stable internal structure and effectively utilizes the space; at the same time, the two ends of the alloy fuse are welded by laser welding to achieve reliable electrical connection and efficient current conduction; the fuse is wrapped with a polymer film to prevent the spark from splashing out instantly during melting, enhancing safety; the first and second plastic plates resistant to electrolytic solution seal the upper and lower sides of the negative lower pole column to prevent the electrolytic solution from eroding and extend the battery life; the current sequentially passes through the negative upper pole column, the overload protection component, and the negative lower pole column. Combining the design of the first sealing ring, the second sealing ring and the multi-layer insulating plate ensures the orderly and safe transmission of current, avoids leakage and short circuit, and improves the reliability of the battery.

[0022] 2. The present invention utilizes the overload protection component to protect the battery from overload, and uses the conductive sheet to connect and conduct the alloy fuse with the negative upper pole column and the negative lower pole column; and uses the function of the polymer film to protect the alloy fuse, reducing the influence of external oxidation on the performance of the alloy fuse. Synchronously, the function of the polymer film is used to wrap the alloy fuse. When the alloy fuse melts due to excessive instantaneous current, the spark generated at the moment of melting of the alloy fuse is slowed down, avoiding the damage of other internal components caused by the spark splash and improving safety.

[0023] 3. During the process of the alloy fuse melting due to overload current, the present invention, through the function of the wax rod arranged on the upper part of the negative lower pole column, the traction force of the elastic pull rope arranged on the upper side of the negative lower pole column on the auxiliary rod, and the release of the auxiliary rod by the wax rod melted by the heating of the alloy fuse to make it move quickly towards the direction of the alloy fuse, and the alloy fuse softened by heat due to the action of the overload current is broken, accelerating its current interruption process, thereby improving the battery open circuit efficiency and further improving safety. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the overload protection structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the positional relationship of the overload protection component of the present invention;

[0027] Figure 4Schematic cross-sectional structure diagram of the overload protection structure of the present invention;

[0028] Figure 5 Schematic diagram of the positional relationship between the second plastic plate of the present invention and the lower negative electrode post;

[0029] Figure 6 Schematic diagram of the positional relationship between the first plastic plate of the present invention and the lower negative electrode post;

[0030] Figure 7 Schematic structure diagram of the overload protection component of the present invention;

[0031] Figure 8 Of the present invention Figure 6 Enlarged schematic diagram of the local structure at A in;

[0032] Figure 9 Schematic cross-sectional structure diagram of the fuse component of the present invention;

[0033] Figure 10 Schematic side view structure diagram of the overload protection component of the present invention;

[0034] Figure 11 Schematic structure diagram of the overload protection component of the present invention.

[0035] In the figure: 1. Battery housing; 2. Negative electrode post; 21. Upper negative electrode post; 22. Lower negative electrode post; 3. Overload protection structure; 31. Upper negative electrode cover plate; 32. Lower negative electrode cover plate; 321. Groove; 33. First plastic plate; 34. First sealing ring; 35. Overload protection component; 351. Fuse component; 3511. Alloy fuse wire; 3512. Conductive sheet; 3513. Polymer film; 352. Wax rod; 353. Auxiliary rod; 354. Elastic pull rope; 36. Second plastic plate; 37. Second sealing ring; 4. Positive electrode post. Detailed implementation manners

[0036] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0037] Example 1, as Figure 1 shown, a highly safe lithium-ion battery with an overload protection device, including a battery housing 1, a positive electrode post 4 is fixedly connected to the lower end of the battery housing 1, an overload protection structure 3 is fixedly connected to the upper end of the battery housing 1, a negative electrode post 2 is disposed at the upper end and inside the overload protection structure 3, an electrochemical cell is disposed inside the battery housing 1, and the negative electrode post 2 and the positive electrode post 4 are respectively connected to the negative electrode and the positive electrode of the electrochemical cell.

[0038] Further, to provide an installation place for the negative electrode post 2, isolate the battery cell from the outside and provide overload protection, refer toFigure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the overload protection structure 3 includes a negative lower cover plate 32 fixedly connected to the upper end of the battery housing 1. A groove 321 is formed in the upper end of the negative lower cover plate 32. A negative upper cover plate 31 is fixedly connected to the inner surface of the groove 321. A plastic plate one 33 is fixedly connected to the lower end of the negative lower cover plate 32. The lower end of the plastic plate one 33 is in close contact with the upper end of the battery cell. The groove 321 formed in the negative lower cover plate 32 is used to install the negative upper cover plate 31. The bottom of the negative upper cover plate 31 is clamped inside the groove 321, and the negative upper cover plate 31 and the negative lower cover plate 32 are fixed to each other by welding.

[0039] Further, to insulate and isolate the negative upper terminal 21, the negative lower terminal 22 from the negative upper cover plate 31 and the negative lower cover plate 32, refer to Figure 4 and Figure 5 , a sealing ring one 34 is fixedly connected to the inner surface of the negative lower cover plate 32 and the inner surface of the plastic plate one 33. A through hole communicating with its inner cavity is formed in the upper end of the negative upper cover plate 31. A sealing ring two 37 is fixedly connected to the inner surface of the through hole. Both the sealing ring one 34 and the sealing ring two 37 are made of rubber material, and the insulation resistance is 1012 Ω.

[0040] Further, to connect the negative terminal 2 to the battery cell and provide overload protection, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the negative terminal 2 includes a negative upper terminal 21 and a negative lower terminal 22. The sealing ring two 37 is sleeved on the outer surface of the negative upper terminal 21. The negative upper terminal 21 is in a T shape, and an annular notch is formed on the outer surface of its horizontal part. The inner surface of the annular notch of the negative upper terminal 21 is fixedly connected to the upper end and the inner surface top wall of the negative upper cover plate 31 respectively. The sealing ring one 34 is arranged between the inner surface of the annular notch of the negative lower terminal 22 and the inner surface of the through hole on the negative upper cover plate 31. The negative lower terminal 22 is in an I shape, and a plastic plate two 36 sleeved on the outer surface of the vertical part of the negative lower terminal 22 is fixedly connected to the lower end of the upper side plane part thereof. The lower end of the plastic plate two 36 is fixedly connected to the upper end of the negative lower cover plate 32. An overload protection component 35 is jointly arranged at the lower end of the negative upper terminal 21 and the upper end of the negative lower terminal 22. Both the plastic plate two 36 and the plastic plate one 33 are made of PPS plastic resistant to electrolytic corrosion.

[0041] In the specific use of the present invention, by setting the groove 321 on the negative electrode lower cover plate 32 and welding the fixing box of the negative electrode upper cover plate 31, the internal structure is compact and stable, and the space is effectively utilized; at the same time, the two ends of the alloy fuse 3511 are welded by laser welding to achieve reliable electrical connection and efficient current conduction; the fuse is wrapped with a polymer film 3513 to prevent sparks from splashing at the moment of melting, thereby enhancing safety; the electrolyte-resistant plastic plate 1 33 and the plastic plate 2 36 seal the upper and lower sides of the negative electrode lower pole 22 to prevent electrolyte erosion and extend the battery life; the current passes through the negative electrode upper pole 21, the overload protection component 35, and the negative electrode lower pole 22 in turn, combined with the sealing ring 1 34, the sealing ring 2 37 and the multi-layer insulation board design to ensure orderly and safe current transmission, avoid leakage short circuit, and improve battery reliability.

[0042] It should be noted that the battery housing 1 has a built-in lithium-ion coil core, which is a conventional battery component. This structure has been widely used in the prior art, and its internal structure, operating principle, wiring, and control method will not be described in detail in the present invention.

[0043] Embodiment 2: Based on Embodiment 1, this embodiment provides overload protection for the battery through an overload protection component 35, and uses a conductive sheet 3512 to connect and conduct the alloy fuse 3511 with the negative upper pole 21 and the negative lower pole 22; and uses the effect of a polymer film 3513 to protect the alloy fuse 3511, reduce the impact of external oxidation on the performance of the alloy fuse 3511, and simultaneously use the effect of the polymer film 3513 to wrap the alloy fuse 3511. When the instantaneous current is too large and the alloy fuse 3511 melts, the spark that appears at the moment of the alloy fuse 3511 melting is slowed down to avoid spark splashing and damage to other internal components, thereby improving safety.

[0044] Specifically, to achieve overload protection for the battery, refer to Figure 7 , Figure 8 and Figure 9 The overload protection component 35 includes a fuse component 351 in a Z shape fixedly connected to the lower end of the negative upper pole 21 and the upper end of the negative lower pole 22; the fuse component 351 includes an alloy fuse 3511, and the upper end of the alloy fuse 3511 is fixedly connected to the negative upper pole 21 and the lower end of the alloy fuse 3511 is fixedly connected to the negative lower pole 22. The outer surface of the alloy fuse 3511 is covered with a polymer film 3513 except for the two conductive sheets 3512.

[0045] The alloy fuse 3511 is made of a copper-silver alloy with a purity of 99.99%. The mass ratio of copper to silver is 85:15. The melting point of the alloy fuse 3511 is 720°C, and the fuse current accuracy is controlled within ±5%. The conductive sheet 3512 is a 0.05-mm polytetrafluoroethylene (PTFE) film;

[0046] When the battery discharges normally, the current is within the rated current range of the alloy fuse 3511, and the alloy fuse 3511 is in a low-resistance state, having no obvious impact on the battery performance. When the external circuit of the battery is short-circuited or rapidly heats up due to the current thermal effect, the alloy fuse 3511 melts within an extremely short time, thus cutting off the current output path and protecting the battery.

[0047] Specifically, the alloy fuse 3511 formed by the copper-silver alloy with the above ratio can ensure excellent conductivity and fusing characteristics in the overcurrent protection of the battery;

[0048] The copper-silver alloy itself has a low resistivity and good electrical conductivity, which helps reduce the energy loss of the battery during normal operation and improve the charge-discharge efficiency of the battery;

[0049] At the same time, the specific mass ratio of copper to silver enables the alloy fuse 3511 to achieve an optimal balance in melting point and fuse current accuracy, and it can melt rapidly when the current abnormally increases, thus effectively protecting the battery from overcurrent damage and enhancing the safety and reliability of the battery.

[0050] The polytetrafluoroethylene (PTFE) film used for the polymer film 3513 has excellent high-temperature resistance, corrosion resistance, and insulation properties;

[0051] The 0.05-mm thickness can ensure the insulation effect while minimizing the occupation of the internal space of the battery, making the battery structure more compact;

[0052] This protective film can effectively prevent sparks from splashing out instantly when the fuse melts, avoiding secondary failures caused by sparks and further enhancing the safety during the use of the battery;

[0053] At the same time, the chemical corrosion resistance of the polytetrafluoroethylene film enables it to resist the erosion of corrosive substances such as the internal electrolyte of the battery, extending the service life of the fuse and ensuring the stability of the battery during long-term use.

[0054] Embodiment 3. On the basis of Embodiment 2, in this embodiment, during the process of the alloy fuse 3511 being melted due to an overload current, by means of the wax rod 352 arranged on the upper part of the negative lower pole 22, the traction force of the elastic pull rope 354 arranged on the upper side of the negative lower pole 22 on the auxiliary rod 353, and the wax rod 352 melted by heating via the alloy fuse 3511 releases the auxiliary rod 353 to make it move rapidly towards the direction where the alloy fuse 3511 is located, and hits and breaks the alloy fuse 3511 that has become soft and melted due to the action of the overload current, accelerating its current interruption process, thereby improving the battery open - circuit efficiency and further enhancing safety.

[0055] Specifically, to accelerate the overload - protection current - interruption action, refer to Figure 10 and Figure 11 , at one end of the negative upper pole 21 and the negative lower pole 22 close to each other, two wax rods 352 are fixedly connected symmetrically along the axis of the fusing component 351. An auxiliary rod 353 is jointly arranged on the inner surfaces of the two wax rods 352. Elastic pull ropes 354 are symmetrically and fixedly connected to the outer surface of the auxiliary rod 353 along the wax rods 352. One ends of the two elastic pull ropes 354 far from the auxiliary rod 353 are fixedly connected to the upper end of the negative lower pole 22 through rivets.

[0056] Furthermore, to achieve the synergistic effect of current - interruption assistance and overload fusing, refer to Figure 10 and Figure 11 , both sides of the wax rods 352 are in contact with the outer surface of the fusing component 351 and wrap the fusing component 351 inside. The auxiliary rod 353 is horizontally placed on the upper part of the fusing component 351 and its outer surface is wrapped inside by the wax rods 352 on both sides. The elastic pull rope 354 is made of an elastic material and its two ends are not on the same vertical line. The elastic pull rope 354 is in a taut state in the initial state.

[0057] The wax rod 352 is a wax column made of polytetrafluoroethylene, which has good stability at high temperatures and will not decompose or deteriorate. Its melting point is about 260 °C, while the operating temperature range of lithium batteries is generally from - 20 °C to 60 °C. During normal use, the wax rod 352 will not be affected;

[0058] When the alloy fuse 3511 is melted due to an overload current, the wax rod 352 will be melted synchronously by heat. At the same time, the auxiliary rod 353 fixed inside the wax rod 352 will lose its restraint and will be pulled by the elastic pull rope 354 towards the direction of the alloy fuse 3511, thereby impacting the center of the alloy fuse 3511, and then causing the alloy fuse 3511 to interrupt the current in the middle, realizing the current interruption of the negative upper pole 21 and the negative lower pole 22, avoiding damage to the internal battery core in the battery case 1 caused by continuous over - current, and further improving the safety performance and protecting the stability of the battery core.

[0059] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A high-safety lithium-ion battery with an overload protection device, comprising a battery housing (1), characterized in that: The lower end of the battery housing (1) is fixedly connected to a positive electrode column (4), the upper end of the battery housing (1) is fixedly connected to an overload protection structure (3), the upper end of the overload protection structure (3) and its inner cavity are jointly provided with a negative electrode column (2), the inner cavity of the battery housing (1) is provided with an electrochemical cell, and the negative electrode column (2) and the positive electrode column (4) are respectively connected to the negative electrode and the positive electrode of the electrochemical cell.

2. The highly secure lithium-ion battery with an overload protection device according to claim 1, characterized in that: The overload protection structure (3) comprises a negative electrode lower cover plate (32) fixedly connected to the upper end of the battery housing (1); a groove (321) is provided at the upper end of the negative electrode lower cover plate (32); the inner surface of the groove (321) is fixedly connected to the negative electrode upper cover plate (31); the lower end of the negative electrode lower cover plate (32) is fixedly connected to a plastic plate (33); the lower end of the plastic plate (33) is in close contact with the upper end of the battery cell.

3. The highly secure lithium-ion battery with an overload protection device according to claim 2, characterized in that: The inner surface of the negative electrode lower cover plate (32) and the inner surface of the plastic plate (33) are fixedly connected with a sealing ring (34). The upper end of the negative electrode upper cover plate (31) is provided with a through hole connected to its inner cavity, and the inner surface of the through hole is fixedly connected with a sealing ring (37).

4. A highly secure lithium-ion battery with an overload protection device according to claim 3, characterized in that: The negative pole (2) comprises a negative upper pole (21) and a negative lower pole (22); the second sealing ring (37) is sleeved on the outer surface of the negative upper pole (21); the negative upper pole (21) is T-shaped and has an annular notch on the outer surface of its horizontal portion; the inner surface of the annular notch of the negative upper pole (21) is respectively fixedly connected to the upper end and the inner surface top wall of the negative upper cover plate (31); the first sealing ring (34) is arranged on the annular surface of the negative lower pole (22). The negative lower pole (22) is in an I-shaped shape, and the lower end of the upper plane portion thereof is fixedly connected to a second plastic plate (36) sleeved on the outer surface of the vertical portion of the negative lower pole (22). The lower end of the second plastic plate (36) is fixedly connected to the upper end of the negative lower cover (32). The lower end of the negative upper pole (21) and the upper end of the negative lower pole (22) are jointly provided with an overload protection component (35).

5. A highly secure lithium-ion battery with an overload protection device according to claim 4, characterized in that: The overload protection component (35) comprises a fuse component (351) in a Z shape and fixedly connected to the lower end of the negative upper pole (21) and the upper end of the negative lower pole (22); two wax sticks (352) are symmetrically distributed and fixedly connected along the axis of the fuse component (351) at the ends of the negative upper pole (21) and the negative lower pole (22) close to each other; auxiliary sticks (353) are commonly arranged on the inner surfaces of the two wax sticks (352); elastic pull ropes (354) are symmetrically fixedly connected to the outer surfaces of the auxiliary sticks (353) along the wax sticks (352); and the ends of the two elastic pull ropes (354) away from the auxiliary sticks (353) are fixedly connected to the upper end of the negative lower pole (22) by rivets.

6. The highly secure lithium-ion battery with an overload protection device according to claim 5, characterized in that: The fuse component (351) includes an alloy fuse wire (3511). Conductive sheets (3512) are fixedly connected to both the upper end of the alloy fuse wire (3511) where it is connected to the upper negative terminal post (21) and the lower end where it is connected to the lower negative terminal post (22). A polymer film (3513) covers the outer surface of the alloy fuse wire (3511) except at the locations of the two conductive sheets (3512).

7. A highly secure lithium-ion battery with an overload protection device according to claim 5, characterized in that: Both of the wax rods (352) on both sides are in contact with the outer surface of the fuse component (351) and enclose the fuse component (351) inside thereof.

8. A highly secure lithium-ion battery with an overload protection device according to claim 5, characterized in that: The auxiliary rod (353) is horizontally placed on the upper part of the fuse component (351), and its outer surface is wrapped inside by the wax rods (352) on both sides.

9. A highly secure lithium-ion battery with an overload protection device according to claim 5, characterized in that: The elastic drawstring (354) is made of an elastic material and its two ends are not on the same vertical line. The elastic drawstring (354) is in a taut state in the initial state.

10. The high-security lithium-ion battery with an overload protection device according to claim 6, characterized in that: The alloy fuse wire (3511) is made of a copper-silver alloy with a purity of 99.99%. The mass ratio of copper to silver is 85:

15. The melting point of the alloy fuse wire (3511) is 720°C, and the fuse current accuracy is controlled within ±5%. The polymer film (3513) is a 0.05-mm polytetrafluoroethylene (PTFE) film. Both the second plastic plate (36) and the first plastic plate (33) are made of PPS plastic resistant to electrolytic corrosion. Both the first sealing ring (34) and the second sealing ring (37) are made of rubber material, and the insulation resistance is 1012 Ω.

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