A battery negative electrode structure and lithium ion battery pack

Abstract

The present invention relates to the technical field of battery packs, specifically a battery negative electrode structure, including a negative electrode sheet and a negative electrode seat, the negative electrode seat including an inner electrode seat and an outer electrode seat, the negative electrode sheet is installed on the inner electrode seat, an inner lead is connected to the negative electrode sheet, and a center seat is embedded in the middle of the outer electrode seat, the center seat is connected to an outer lead, the inner electrode seat is closed and arranged at the end of the battery, and a plug tube is arranged on the inner electrode seat, a drainage seat is connected to the outer electrode seat, and a plug with an inclined groove is installed on the drainage seat, the plug is connected to the plug tube, and a drainage structure is arranged on the drainage seat, and a cavity is arranged in the drainage seat and the inner electrode seat, and a first heat sink is arranged on the inner electrode seat; a lithium ion battery pack is also disclosed, the lithium ion battery pack is composed of a combination of lithium ion single cells, and the lithium ion single cells adopt the above-mentioned battery negative electrode structure. The present invention can achieve the purpose of automatic disconnection, interruption of thermal runaway, and avoidance of battery explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, in particular to a battery negative electrode structure and a lithium ion battery pack thereof. Background Art

[0002] Lithium-ion battery is a commonly used rechargeable battery, which consists of a positive electrode, a negative electrode, an electrolyte and a separator. Lithium-ion battery has the advantages of high energy density, long life and light weight, so it is widely used in mobile devices, electric vehicles and other fields.

[0003] However, due to the characteristics of lithium-ion batteries, there is a risk of thermal runaway. When a short circuit or abnormal conditions such as overcharge or over-discharge occur inside the battery, excessive heat will be generated inside the battery, causing the battery temperature to rise, which in turn causes thermal runaway. Thermal runaway may cause serious accidents such as combustion and explosion inside the battery, resulting in casualties and property losses.

[0004] Conventional lithium-ion battery packs are usually composed of multiple single lithium-ion batteries. The electrodes at both ends of the lithium-ion single battery are usually completely closed to prevent leakage of the electrolyte. However, when thermal runaway occurs, the boiling and evaporation of the electrolyte will accelerate battery damage, causing short circuits and combustion inside the battery. Current lithium-ion battery packs cannot disconnect and release the heat inside the battery in time, making it difficult to avoid battery explosion when thermal runaway occurs. Summary of the invention

[0005] The object of the present invention is to provide a battery negative electrode structure and a lithium-ion battery pack thereof, so as to achieve the purpose of automatic disconnection, interruption of thermal runaway, and avoidance of battery explosion, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a battery negative electrode structure, comprising a negative electrode sheet and a negative electrode seat, the negative electrode seat comprising an inner electrode seat and an outer electrode seat, and the negative electrode sheet is installed on the inner electrode seat, an inner lead is connected to the negative electrode sheet, and a center seat is embedded in the middle of the outer electrode seat, an outer lead is connected to the center seat, the inner electrode seat is closed and arranged at the end of the battery, and a plug tube is arranged on the inner electrode seat, the outer electrode seat is connected to a drainage seat, and a plug with an inclined groove is installed on the drainage seat, the plug is connected to the plug tube, and a drainage structure is arranged on the drainage seat, and cavities are arranged in the drainage seat and the inner electrode seat, and a first heat sink is arranged on the inner electrode seat.

[0007] Preferably, the inner lead is an L-shaped structure, and the vertical portion of the inner lead is arranged through the center seat, and the horizontal portion is attached to the bottom surface of the center seat, and the outer lead is installed on the top surface of the outer pole seat, and the outer lead is provided with four pins around it.

[0008] Preferably, the outer pole seat is arranged in contact with the inner pole seat, and the outer lead wire is in contact with the inner lead wire. A through groove is provided on the inner pole seat, and the plug tube is installed in the through groove.

[0009] Preferably, the drainage seat is installed on the top of the outer pole seat, and the inclined groove is arranged on one side of the plug. The drainage seat is provided with a groove around the plug, and a through hole is provided in the groove.

[0010] Preferably, the first heat sink is annularly arranged on the side wall of the outer pole seat, and a connecting pipe is arranged on the outer pole seat.

[0011] A lithium-ion battery pack is composed of a combination of lithium-ion single cells, and the lithium-ion single cells adopt the above-mentioned battery negative electrode structure. The lithium-ion battery pack includes a battery box, and the lithium-ion single cells are arranged in the battery box through a bracket structure. A recovery seat is installed at the bottom of the battery box for lifting, and the recovery seat is connected with the external pole seat through a connecting pipe. A hanging block is arranged on the recovery seat, and a hanging seat is arranged in the battery box. An outward push spring is connected between the hanging block and the hanging seat. The hanging block is connected to the hanging seat through an insert block, and a limiting structure is arranged on the hanging seat. The hanging block is fixed by the connection between the limiting structure and the insert block. The limiting structure can release the restriction on the insert block under high temperature, and a second heat sink is arranged on the recovery seat. A heat dissipation groove is arranged at the bottom of the battery box.

[0012] Preferably, a box cover with a power connection structure is provided on the top of the battery box, and the bottom of the battery box adopts a detachable structure. The lithium-ion single battery is arranged in the battery box with the positive pole facing upward and the negative pole facing downward, and the bracket structure includes a middle bracket and an upper bracket.

[0013] Preferably, the recovery seat is located below the outer pole seat, and a recovery cavity connected to the outer pole seat is provided in the recovery seat, the hanging block is arranged around the recovery seat, and the hanging seat is installed on the inner wall of the battery box, and the outward push spring is in a compressed state.

[0014] Preferably, a slot is provided at the bottom of the hanger, and the insert extends into the hanger through the slot, the limiting structure includes a positioning rod movably arranged on the hanger, and an end plate is connected to the positioning rod, and a memory alloy rod is connected between the end plate and the hanger.

[0015] Preferably, a hanging hole is provided on the insert block, and the positioning rod is connected to the hanging hole, and the memory alloy rod can push the end plate and the positioning rod after being heated.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The negative electrode structure of the battery adopts a split structure, consisting of two parts, inner and outer. When thermal runaway occurs, the battery can be powered off in time by separating the outer electrode seat from the inner electrode seat. At the same time, the electrolyte in the battery can be discharged, thereby stopping the temperature rise in time and blocking the battery explosion process.

[0018] 2. The negative electrode structure of the present invention has a negative electrode sheet installed inside the battery through an inner electrode seat for charging and discharging of the battery. The negative electrode sheet is led out of the inner electrode seat through an inner lead, and an outer lead is provided on the outer electrode seat to further lead it out of the outer electrode seat, and the outer lead is provided with four pins, which is more convenient for assembly and connection when the batteries are arranged in series. The outer lead and the inner lead adopt a non-fixed connection structure. When the outer electrode seat is attached to the inner electrode seat, the current of the battery can pass through the inner lead and the outer lead. If thermal runaway occurs, the outer lead and the inner lead can be disconnected by moving the outer electrode seat away from the inner electrode seat, thereby quickly cutting off the power to the battery.

[0019] 3. The movement of the external pole seat drives the drainage seat and the plug to move accordingly. When the plug moves to the lower part of the plug tube, the bottom of the chute is separated from the plug tube, and the electrolyte can flow down along the chute and enter the groove, and then enter the external pole seat from the through hole in the groove. After the high-temperature electrolyte enters the external pole seat, the first heat sink thereon can dissipate its heat more efficiently and reduce the internal pressure of the battery. In order to avoid leakage of the electrolyte, the external pole seat can further guide the electrolyte into the recovery seat through the connecting tube.

[0020] 4. The lithium-ion battery pack of the present invention can monitor the internal temperature. When thermal runaway occurs, the external pole seat in the negative electrode structure of the single cell can be moved through the recovery seat therein, thereby releasing the electrical connection of the battery. At the same time, the electrolyte can be recovered and heat dissipated through the external pole seat, effectively interrupting the battery explosion process.

[0021] 5. When the lithium-ion battery pack of the present invention is working normally, the recovery seat is in a high position, and the outer pole seat thereon is also kept in a fitted state with the inner pole seat. At this time, the recovery seat is fixed by the hanging structure to ensure that the outer lead and the inner lead are normally connected, and the electrolyte will not flow out. When the lithium-ion battery pack has a thermal runaway phenomenon, the temperature inside it rises sharply, which can restore the memory alloy rod to its original state, so that the hanging structure is unlocked, and the recovery seat moves downward under the action of its own gravity and the elastic force of the outward push spring, thereby disconnecting the negative electrode structure of the battery and introducing the electrolyte into the recovery seat, and the second heat sink is used to further cool the electrolyte to avoid battery explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the negative electrode structure of the present invention in a single cell.

[0023] Figure 2 Schematic diagram of the negative electrode structure of the present invention.

[0024] Figure 3 Schematic diagram of the explosion of the negative electrode structure of the present invention.

[0025] Figure 4 Schematic diagram of the negative electrode sheet structure of the present invention.

[0026] Figure 5 It is a top schematic diagram of the external pole seat structure of the present invention.

[0027] Figure 6 It is a bottom schematic diagram of the outer pole seat structure of the present invention.

[0028] Figure 7 Schematic diagram of the plug structure of the present invention.

[0029] Figure 8 It is a schematic diagram of the recovery seat structure of the present invention.

[0030] Fig. 9 Schematic diagram of the single cell structure of the present invention.

[0031] Fig.10 It is a top schematic diagram of the battery pack structure of the present invention.

[0032] Fig.11 It is a bottom schematic diagram of the battery pack structure of the present invention.

[0033] Fig.12 Schematic diagram of the battery box structure of the present invention.

[0034] Fig.13 This is a schematic diagram of the battery box of the present invention in an open state.

[0035] Fig.14 It is a schematic diagram of the bottom structure of the battery box of the present invention.

[0036] Fig.15 It is a first schematic diagram of the hanging structure of the present invention.

[0037] Fig.16 This is a second schematic diagram of the hanging structure of the present invention.

[0038] In the figure: 1. negative electrode plate; 2. inner pole seat; 3. outer pole seat; 4. inner lead; 5. center seat; 6. outer lead; 7. pin; 8. through groove; 9. plug tube; 10. drainage seat; 11. plug; 12. inclined groove; 13. groove; 14. through hole; 15. first heat sink; 16. connecting pipe; 17. battery box; 18. middle bracket; 19. upper bracket; 20. recovery seat; 21. lifting block; 22. hanging seat; 23. push-out spring; 24. plug block; 25. hanging hole; 26. slot; 27. positioning rod; 28. end plate; 29. ​​memory alloy rod; 30. second heat sink; 31. heat sink. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] See also Figures 1 to 16 The present invention provides a technical solution: a battery negative electrode structure, including a negative electrode sheet 1 and a negative electrode seat, the negative electrode seat including an inner electrode seat 2 and an outer electrode seat 3, and the negative electrode sheet 1 is installed on the inner electrode seat 2, an inner lead 4 is connected to the negative electrode sheet 1, and a center seat 5 is embedded in the middle of the outer electrode seat 3, and an outer lead 6 is connected to the center seat 5, the inner electrode seat 2 is closed and arranged at the end of the battery, and a plug tube 9 is arranged on the inner electrode seat 2, a drainage seat 10 is connected to the outer electrode seat 3, and a plug 11 with an inclined groove 12 is installed on the drainage seat 10, the plug 11 is connected to the plug tube 9, and a drainage structure is arranged on the drainage seat 10, and cavities are arranged in the drainage seat 10 and the inner electrode seat 2, and a first heat sink 15 is arranged on the inner electrode seat 2.

[0041] The negative electrode structure of the battery of the present invention adopts a split structure, consisting of an inner and outer part. When thermal runaway occurs, the battery can be powered off in time by separating the outer pole seat 3 from the inner pole seat 2. At the same time, the electrolyte in the battery can be discharged, thereby stopping the temperature rise in time and blocking the battery explosion process.

[0042] The inner lead 4 is an L-shaped structure, and the vertical portion of the inner lead 4 is set through the center seat 5, and the horizontal portion is attached to the bottom surface of the center seat 5. The outer lead 6 is installed on the top surface of the outer pole seat 3, and the outer lead 6 is provided with four pins 7 around it.

[0043] The negative electrode sheet 1 of the negative electrode structure is installed inside the battery through the inner pole seat 2 and is used for the charging and discharging of the battery. The negative electrode sheet 1 is led out of the inner pole seat 2 through the inner lead 4, and the outer pole seat 3 is provided with an outer lead 6, which can further lead it out of the outer pole seat 3, and the outer lead 6 is provided with four pins 7, which is more convenient for assembly and connection when the batteries are arranged in series.

[0044] The outer pole seat 3 is arranged in contact with the inner pole seat 2 , and the outer lead 6 is in contact with the inner lead 4 . A through groove 8 is provided on the inner pole seat 2 , and the plug tube 9 is installed in the through groove 8 .

[0045] The outer lead 6 and the inner lead 4 adopt a non-fixed connection structure. When the outer pole seat 3 is attached to the inner pole seat 2, the current of the battery can pass through the inner lead 4 and the outer lead 6. If thermal runaway occurs, the outer lead 6 and the inner lead 4 can be disconnected by moving the outer pole seat 3 away from the inner pole seat 2, and the battery can be powered off quickly. At the same time, as the outer pole seat 3 moves, the plug tube 9 can be opened, and the high-temperature electrolyte in the battery can flow out, quickly dissipating heat and avoiding damage to the inside of the battery.

[0046] The drainage seat 10 is installed on the top of the outer pole seat 3 , and the inclined groove 12 is arranged on one side of the plug 11 . The drainage seat 10 is provided with a groove 13 around the plug 11 , and a through hole 14 is arranged in the groove 13 .

[0047] When the outer pole seat 3 moves, the drainage seat 10 and the plug 11 thereon move accordingly. When the plug 11 moves to the lower half of the plug tube 9, the bottom of the inclined groove 12 detaches from the plug tube 9, and the electrolyte can flow down along the inclined groove 12, enter the groove 13, and then enter the outer pole seat 3 from the through hole 14 in the groove 13.

[0048] The first heat sink 15 is annularly arranged on the side wall of the outer pole seat 3 , and a connecting pipe 16 is arranged on the outer pole seat 3 .

[0049] After the high-temperature electrolyte enters the outer pole seat 3, the first heat sink 15 thereon can dissipate its heat more efficiently and reduce the internal pressure of the battery. In order to avoid electrolyte leakage, the outer pole seat 3 can further guide the electrolyte into the recovery seat 20 through the connecting tube 16.

[0050] A lithium-ion battery pack is composed of a combination of lithium-ion single cells, and the lithium-ion single cells adopt the above-mentioned battery negative electrode structure. The lithium-ion battery pack includes a battery box 17, and the lithium-ion single cells are arranged in the battery box 17 through a bracket structure. A recovery seat 20 is installed at the bottom of the battery box 17 for lifting, and the recovery seat 20 is connected with an external pole seat 3 through a connecting pipe 16. A hanging block 21 is arranged on the recovery seat 20, and a hanging seat 22 is arranged in the battery box 17. An outward push spring 23 is connected between the hanging block 21 and the hanging seat 22. The hanging block 21 is connected to the hanging seat 22 through an insert block 24, and a limiting structure is arranged on the hanging seat 22. The hanging block 21 is fixed by connecting the limiting structure with the insert block 24. The limiting structure can release the restriction on the insert block 24 under high temperature, and a second heat sink 30 is arranged on the recovery seat 20, and a heat dissipation groove 31 is arranged at the bottom of the battery box 17.

[0051] The lithium-ion battery pack of the present invention can monitor the internal temperature. When thermal runaway occurs, the external pole seat 3 in the negative electrode structure of the single cell can be moved through the recovery seat 20 therein, thereby releasing the electrical connection of the battery. At the same time, the electrolyte can be recovered and heat-dissipated through the external pole seat 3, effectively interrupting the battery explosion process.

[0052] A box cover with a power connection structure is arranged on the top of the battery box 17, and the bottom of the battery box 17 adopts a detachable structure. The lithium-ion single battery is arranged in the battery box 17 with the positive pole facing upward and the negative pole facing downward, and the bracket structure includes a middle bracket 18 and an upper bracket 19.

[0053] The lithium-ion battery pack uses a battery box 17 as the main body, and the single cells are arranged through the middle bracket 18 and the upper bracket 19, and the negative electrode structures of the single cells are all arranged downward to facilitate the outflow and recovery of the electrolyte. The bottom of the battery box 17 can be opened to facilitate the treatment of the electrolyte in the recovery seat 20 at a later time.

[0054] The recovery seat 20 is located below the outer pole seat 3, and a recovery cavity connected to the outer pole seat 3 is provided in the recovery seat 20, the hanging block 21 is arranged around the recovery seat 20, and the hanging seat 22 is installed on the inner wall of the battery box 17, and the outward push spring 23 is in a compressed state.

[0055] The electrolyte in the outer pole seat 3 enters the recovery cavity of the recovery seat 20 from the connecting tube 16. When the battery is working normally, the recovery seat 20 is in a high position, and the outer pole seat 3 thereon is also kept in a fitted state with the inner pole seat 2. At this time, the recovery seat 20 is fixed by a hanging structure to ensure that the outer lead 6 and the inner lead 4 are normally connected and the electrolyte will not flow out.

[0056] A slot 26 is provided at the bottom of the hanger 22, and the insert block 24 extends into the hanger 22 through the slot 26. The limiting structure includes a positioning rod 27 movably arranged on the hanger 22, and an end plate 28 is connected to the positioning rod 27. A memory alloy rod 29 is connected between the end plate 28 and the hanger 22.

[0057] During assembly, the plug block 24 on the hanging block 21 is inserted into the hanging seat 22, and the positioning rod 27 on the hanging seat 22 is connected to the hanging hole 25 on the plug block 24 to restrict the plug block 24, so that the recovery seat 20 is fixed at a high position by the plug block 24.

[0058] The insert block 24 is provided with a hanging hole 25 , and the positioning rod 27 is connected to the hanging hole 25 . The memory alloy rod 29 can push the end plate 28 and the positioning rod 27 after being heated.

[0059] If thermal runaway occurs in the lithium-ion battery pack, the temperature inside it rises sharply, which can restore the memory alloy rod 29 to its original state and push the end plate 28, so that the positioning rod 27 is disengaged from the hanging hole 25, and the restriction on the lifting block 21 disappears. The recovery seat 20 moves downward under the action of its own gravity and the elastic force of the outward push spring 23, so that the negative electrode structure of the battery is disconnected and the electrolyte is introduced into the recovery seat 20, and the second heat sink 30 on the recovery seat 20 enters the heat dissipation groove 31. The second heat sink 30 is used to further cool the electrolyte to avoid battery explosion.

[0060] When the present invention is in use: first, the negative electrode structure of the battery adopts a split structure, which is composed of an inner and outer part. When thermal runaway occurs, the battery can be powered off in time by separating the outer pole seat 3 from the inner pole seat 2. At the same time, the electrolyte in the battery is led out, thereby stopping the temperature rise in time and blocking the battery explosion process. The negative electrode sheet 1 of the negative electrode structure is installed inside the battery through the inner pole seat 2 for battery charging and discharging. The negative electrode sheet 1 is led out of the inner pole seat 2 through the inner lead 4, and the outer pole seat 3 is provided with an outer lead 6, which can be further led out of the outer pole seat 3, and the outer lead 6 is provided with four pins 7, which is more convenient for assembly and connection when the batteries are arranged in series. The outer lead 6 and the inner lead 4 adopt a non-fixed connection structure. When the outer pole seat 3 is attached to the inner pole seat 2, the battery current can pass through the inner lead 4 and the outer lead 6, and if thermal runaway occurs. By moving the outer pole seat 3 away from the inner pole seat 2, the outer lead 6 and the inner lead 4 can be disconnected, and the battery can be quickly powered off. At the same time, as the outer pole seat 3 moves, the plug tube 9 can be opened, and the high-temperature electrolyte in the battery can flow out, quickly dissipate heat, and avoid damage to the inside of the battery. When the outer pole seat 3 moves, the drainage seat 10 and the plug 11 thereon move accordingly. When the plug 11 moves to the lower half of the plug tube 9, the bottom of the chute 12 is separated from the plug tube 9, and the electrolyte can flow down along the chute 12 and enter the groove 13, and then enter the outer pole seat 3 from the through hole 14 in the groove 13. After the high-temperature electrolyte enters the outer pole seat 3, the first heat sink 15 thereon can dissipate its heat more efficiently, reducing the internal pressure of the battery. In order to avoid leakage of the electrolyte, the outer pole seat 3 can further guide the electrolyte into the recovery seat 20 through the connecting tube 16;

[0061] The lithium-ion battery pack can monitor the internal temperature. When thermal runaway occurs, the recovery seat 20 inside it can move the external pole seat 3 in the negative electrode structure of the single cell, thereby releasing the electrical connection of the battery. At the same time, the electrolyte is recovered and heat is treated through the external pole seat 3, effectively interrupting the battery explosion process. The lithium-ion battery pack uses the battery box 17 as the main body, and arranges the single cells through the middle bracket 18 and the upper bracket 19 therein, and the negative electrode structures of the single cells are all arranged downward to facilitate the outflow and recovery of the electrolyte. The bottom of the battery box 17 can be opened to facilitate the subsequent treatment of the electrolyte in the recovery seat 20. The electrolyte in the external pole seat 3 enters the recovery cavity of the recovery seat 20 from the connecting tube 16. When the battery is working normally, the recovery seat 20 is in a high position, and the external pole seat 3 thereon is also kept in a fit with the internal pole seat 2. At this time, the recovery seat 20 is fixed by a hanging structure to ensure To ensure that the outer lead 6 and the inner lead 4 are connected normally, the electrolyte will not flow out. During assembly, the plug block 24 on the hanging block 21 is inserted into the hanging seat 22, and the positioning rod 27 on the hanging seat 22 is connected to the hanging hole 25 on the plug block 24 to restrict the plug block 24, so that the recovery seat 20 is fixed at a high position by the plug block 24. If the lithium-ion battery pack has thermal runaway, the temperature inside it rises sharply, which can restore the memory alloy rod 29 to its original state, and push the end plate 28 to make the positioning rod 27 detach from the hanging hole 25, and the restriction on the hanging block 21 disappears. The recovery seat 20 moves downward under the action of its own gravity and the elastic force of the outward push spring 23, so that the negative electrode structure of the battery is disconnected and the electrolyte is introduced into the recovery seat 20, and the second heat sink 30 on the recovery seat 20 enters the heat dissipation groove 31, and the second heat sink 30 is used to further cool the electrolyte to avoid battery explosion.

[0062] 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-ion battery pack, which is composed of a combination of lithium-ion single cells, and the lithium-ion single cells adopt a battery negative electrode structure, characterized in that: The battery negative electrode structure comprises a negative electrode sheet (1) and a negative electrode seat, wherein the negative electrode seat comprises an inner electrode seat (2) and an outer electrode seat (3), and the negative electrode sheet (1) is mounted on the inner electrode seat (2), an inner lead wire (4) is connected to the negative electrode sheet (1), and a center seat (5) is embedded in the middle of the outer electrode seat (3), and an outer lead wire (6) is connected to the center seat (5), and the inner electrode seat (2) is closed and arranged at the end of the battery, and the inner electrode seat (2 ) is provided with a plug tube (9), the outer pole seat (3) is connected to a drainage seat (10), and a plug (11) with an inclined groove (12) is installed on the drainage seat (10), the plug (11) is connected to the plug tube (9), and the drainage seat (10) is provided with a drainage structure, and the drainage seat (10) and the inner pole seat (2) are both provided with cavities, and the outer pole seat (3) is provided with a first heat sink (15). The lithium ion battery pack also includes an electric A battery box (17), wherein lithium-ion single cells are arranged in the battery box (17) via a bracket structure, a recovery seat (20) is installed at the bottom of the battery box (17) in a lifting manner, and the recovery seat (20) is connected to the outer pole seat (3) via a connecting pipe (16), a lifting block (21) is arranged on the recovery seat (20), and a hanging seat (22) is arranged in the battery box (17), an outward push spring (23) is connected between the lifting block (21) and the hanging seat (22), the lifting block (21) is connected to the hanging seat (22) via an insert block (24), and a limiting structure is arranged on the hanging seat (22), and the lifting block (21) is fixed by connecting the limiting structure with the insert block (24), and the limiting structure can release the restriction on the insert block (24) under high temperature, and a second heat sink (30) is arranged on the recovery seat (20), and a heat dissipation groove (31) is arranged at the bottom of the battery box (17).

2. A lithium-ion battery pack according to claim 1, characterized in that: The inner lead (4) is an L-shaped structure, and the vertical portion of the inner lead (4) is arranged to penetrate the inner pole seat (2), and the horizontal portion is attached to the bottom surface of the inner pole seat (2); the outer lead (6) is installed on the top surface of the outer pole seat (3), and the outer lead (6) is provided with four pins (7) on all sides.

3. A lithium-ion battery pack according to claim 1, characterized in that: The outer pole seat (3) is arranged in contact with the inner pole seat (2), and the outer lead wire (6) and the inner lead wire (4) are in contact and connected. A through groove (8) is provided on the inner pole seat (2), and the plug tube (9) is installed in the through groove (8).

4. A lithium-ion battery pack according to claim 1, characterized in that: The drainage seat (10) is installed on the top of the outer pole seat (3), and the inclined groove (12) is arranged on one side of the plug (11). The drainage seat (10) is provided with a groove (13) around the plug (11), and a through hole (14) is arranged in the groove (13).

5. A lithium-ion battery pack according to claim 1, characterized in that: The first heat sink (15) is arranged in an annular shape on the side wall of the outer pole seat (3), and a connecting pipe (16) is arranged on the outer pole seat (3).

6. A lithium-ion battery pack according to claim 1, characterized in that: The top of the battery box (17) is provided with a box cover having a power connection structure, and the bottom of the battery box (17) is a detachable structure; the lithium-ion single battery is arranged in the battery box (17) with the positive electrode facing upward and the negative electrode facing downward, and the support structure comprises a middle support (18) and an upper support (19).

7. A lithium-ion battery pack according to claim 1, characterized in that: The recovery seat (20) is located below the outer pole seat (3), and a recovery chamber connected to the outer pole seat (3) is provided in the recovery seat (20), the hanging block (21) is arranged around the recovery seat (20), and the hanging seat (22) is installed on the inner wall of the battery box (17), and the outward push spring (23) is in a compressed state.

8. A lithium-ion battery pack according to claim 1, characterized in that: A slot (26) is provided at the bottom of the suspension seat (22), and the insert block (24) extends into the suspension seat (22) through the slot (26). The limiting structure comprises a positioning rod (27) movably arranged on the suspension seat (22), and an end plate (28) is connected to the positioning rod (27). A memory alloy rod (29) is connected between the end plate (28) and the suspension seat (22).

9. A lithium-ion battery pack according to claim 8, characterized in that: The insert block (24) is provided with a hanging hole (25), and the positioning rod (27) is connected to the hanging hole (25), and the memory alloy rod (29) is capable of pushing the end plate (28) and the positioning rod (27) after being heated.

Images