A lithium ion battery structure

Abstract

The present invention belongs to the lithium-ion battery structure in the technical field of new energy power batteries. The winding core module (A) of the lithium-ion battery structure includes a positive electrode sheet (23), a positive electrode ear (16), a diaphragm (24), a negative electrode sheet (25) and a negative electrode ear (17). The positive electrode sheet (23) coats the positive electrode material on both sides of the aluminum foil, and the negative electrode sheet (25) coats the negative electrode material on both sides of the copper foil. The positive electrode aluminum foil and the negative electrode copper foil are the current collectors of the battery. The positive electrode sheet (23), the diaphragm (24) and the negative electrode sheet (25) are arranged and connected in a winding manner, and the diaphragm (24) is located between adjacent positive electrode sheets (23) and negative electrode sheets (25). The lithium-ion battery structure described in the present invention effectively prevents metal dust generated during laser welding from entering the module, avoids the risk of short circuit of the lithium-ion battery, improves manufacturing efficiency and qualified rate, greatly improves the energy density of the lithium-ion battery, prevents damage to the winding core module during the shelling process, and improves the overall performance of the battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy power batteries, and more specifically, relates to a lithium-ion battery structure. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, high output power, high average output voltage, long charge and discharge cycle life, low self-discharge, good safety performance, wide operating temperature range, no memory effect and environmental friendliness. As rechargeable batteries, they are widely used in mobile portable devices, electric vehicle energy technology, rail transit, energy storage batteries for large power plants, UPS power supplies, medical instrument power supplies, communication base stations, national defense space technology and aerospace. With the deepening of technological research and the expansion of demand, the performance of lithium-ion batteries in all aspects has been continuously improved, such as safety and cycle life. Therefore, lithium-ion batteries have become the first choice for power and energy storage batteries, effectively promoting and promoting the rapid development of electric vehicles and intelligent energy storage industries.

[0003] The existing lithium-ion battery module structure is relatively complex. When the external lead-out terminal is led out, the sealing effect between the battery cover and the aluminum shell cannot be well guaranteed. A large amount of metal dust will be generated in the laser welding process of the connecting piece and the cover. The welding positions are close to the opening of the winding core, which makes it very easy for metal dust to enter the inside of the winding core, causing the lithium-ion battery to be scrapped after a short circuit. In addition, the lithium-ion battery lacks necessary explosion-proof protection devices and has poor safety performance. Under special circumstances such as overcharging or internal thermal runaway, the internal air pressure increases, and the rupture gap of the bursting piece is small, so that the internal air pressure cannot be discharged in time, causing the battery to explode. After the bursting piece is detonated, the battery continues to be damaged, resulting in the inability to fully protect the power battery. The explosion-proof piece on the battery top cover is a single explosion-proof piece that is sealed and welded in the center of the top cover. Such a structure can increase the safety performance of the power battery to a certain extent. At the same time, due to the use of a set of aluminum shells and a set of cover plates, the energy density of the lithium-ion battery cannot be effectively improved, and the manufacturing cost cannot be reduced, which makes the manufacturing bottleneck. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lithium-ion battery structure with a simple structure, which can effectively prevent metal dust generated during laser welding from entering the module, avoid the risk of short circuit of lithium-ion batteries, improve manufacturing efficiency and pass rate, greatly improve the energy density of lithium-ion batteries, prevent damage to the core module during the shelling process, and improve the overall performance of the lithium-ion battery structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0006] The present invention discloses a lithium-ion battery structure, comprising a plurality of winding core modules, a connecting sheet module, a cover plate module and an aluminum shell module. The winding core module comprises a positive electrode sheet, a positive electrode ear, a diaphragm, a negative electrode sheet and a negative electrode ear. The positive electrode sheet is coated with positive electrode material on both sides of aluminum foil, and the negative electrode sheet is coated with negative electrode material on both sides of copper foil. The positive electrode aluminum foil and the negative electrode copper foil are the current collectors of the battery. The positive electrode sheet, the diaphragm and the negative electrode sheet are arranged and connected in a winding manner, and the diaphragm is located between adjacent positive electrode sheets and negative electrode sheets.

[0007] The connecting piece module comprises a positive connecting piece, a negative connecting piece, a positive U-shaped piece and a negative U-shaped piece. The positive connecting piece and the negative connecting piece are respectively provided with welding foolproof limit angles, and the positive U-shaped piece and the negative U-shaped piece are respectively provided with bosses and positioning holes.

[0008] The cover plate module includes a positive cover plate and a negative cover plate. The positive cover plate includes a positive stamped cover plate, a positive column, a cap and a sealing plug. The positive column is connected to the positive stamped cover plate and the aluminum shell, and all are positive electrodes. The negative cover plate includes a negative column, a sealing ring, a negative stamped cover plate, a lower injection-molded insulating sheet, an explosion-proof sheet and an explosion-proof sheet protective film, and a negative lower injection-molded boss.

[0009] The negative pole column comprises a negative terminal, an upper injection-molded insulating sheet and a negative pole column welding sheet, the negative terminal is exposed to the outside of the lithium-ion battery, the negative pole stamping cover plate is provided with a cover plate hole, the negative pole stamping cover plate is provided with an inverted hole on the inner side of the lithium-ion battery, the lower injection-molded insulating sheet is provided with a boss on the outer side of the lithium-ion battery, and the lower injection-molded insulating sheet is provided with a boss on the inner side of the lithium-ion battery corresponding to the positioning hole on the negative pole U-shaped piece.

[0010] The core winding module and the connecting piece module are fixedly connected by the positive connecting piece and the negative connecting piece. The positive connecting piece is respectively fixed to the positive U-shaped piece and the positive ear, and the negative connecting piece is respectively fixed to the negative U-shaped piece and the negative ear. Multiple core winding modules and connecting piece modules are fixed by spacers and side plates through buckles and loaded into the aluminum shell module together. The aluminum shell module is fixed to the cover plate module.

[0011] The connecting piece module and the cover plate module are fixed by bosses and positioning holes, the positive U-shaped piece is fixed to the positive connecting piece and the positive cover plate respectively, the negative U-shaped piece, the lower injection-molded insulating sheet and the negative stamped cover plate are fixed by positioning holes, bosses and undercut holes, the negative pole column extends into the battery cover plate through the cover plate hole, the negative terminal part is exposed to the outside of the lithium-ion battery, the sealing part is sealed with the cover plate hole, and the sealing part includes a sealing ring.

[0012] The lithium-ion battery structure also includes insulating tape. The insulating tape is pasted on the back of the connecting piece of the connecting piece module and the fixed position of the pole ear, and the insulating tape is pasted on the front of the connecting piece and the fixed position of the pole ear and the protective small piece. The spacer and the side plate are fixed by buckles and then combined into an aluminum shell.

[0013] The lithium-ion battery structure also includes an insulating film, a spacer and a side plate; the insulating film is coated on the core module, the spacer fixes the pole ears at both ends of the pole piece of the core module, the side plate is fixed on both sides of the core module, and the spacer and the side plate are connected by a buckle.

[0014] The positive electrode stamping cover plate and the negative electrode stamping cover plate are respectively provided with a liquid injection hole and an explosion-proof hole; the explosion-proof sheet is installed on the side of the negative electrode stamping cover plate facing the inside of the winding core body, and the negative electrode stamping cover plate is provided with an explosion-proof hole and an explosion-proof protective film cooperating with the explosion-proof hole.

[0015] The lower injection-molded insulating sheet and the sealing ring are both structures made of electrolyte-resistant and high-temperature-resistant materials.

[0016] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0017] The lithium-ion battery structure described in the present invention includes multiple core modules, connecting piece modules, cover modules and aluminum shell modules. The structures of the core modules, connecting piece modules, cover modules and aluminum shell modules are improved in many aspects. Each component is improved in many parts. After multiple core modules, connecting piece modules, cover modules and aluminum shell modules are combined and connected with each other, a lithium-ion battery structure is formed. The overall structure solves many problems and achieves many effects through various structures. The lithium-ion battery structure described in the present invention effectively prevents metal dust generated during laser welding from entering the module, avoids the risk of short circuit of lithium-ion batteries, improves manufacturing efficiency and qualified rate, greatly improves the energy density of lithium-ion batteries, prevents damage to the core module during the shelling process, and improves the overall performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 It is a schematic diagram of the explosion structure of the lithium-ion battery structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the winding core module of the lithium-ion battery structure of the present invention;

[0021] Figure 3 A schematic structural diagram of a cover module of a lithium-ion battery structure according to the present invention;

[0022] Figure 4 A schematic structural diagram of a cover module of a lithium-ion battery structure according to the present invention;

[0023] Figure 5 A schematic structural diagram of a cover module of a lithium-ion battery structure according to the present invention;

[0024] Figure 6 A schematic structural diagram of a negative electrode connecting piece of a lithium-ion battery structure according to the present invention;

[0025] Figure 7 A schematic structural diagram of a negative electrode connecting piece of a lithium-ion battery structure according to the present invention;

[0026] Figure 8 A schematic structural diagram of a positive electrode connecting piece of a lithium-ion battery structure according to the present invention;

[0027] Fig. 9 A schematic structural diagram of a positive electrode connecting piece of a lithium-ion battery structure according to the present invention;

[0028] Fig.10 It is a structural schematic diagram of the winding core module of the lithium-ion battery structure of the present invention;

[0029] Fig.11 A schematic structural diagram of a positive electrode cover plate of a lithium-ion battery structure according to the present invention;

[0030] Fig.12 A schematic structural diagram of a negative electrode cover plate of a lithium-ion battery structure according to the present invention;

[0031] Fig.13 This is a schematic diagram of the structure of the lithium-ion battery structure of the present invention when the insulating tape is used to connect the winding core module and the connecting piece module;

[0032] Fig.14 A schematic structural diagram of a negative terminal of a lithium-ion battery structure according to the present invention;

[0033] The following are marked as follows: A, winding core module; B, connecting piece module; C, cover plate module; D, aluminum shell module; 1, negative electrode stamping cover plate; 2, negative electrode column; 3, sealing ring; 4, explosion-proof plate protective film; 5, explosion-proof plate; 6, lower injection-molded insulating sheet; 7, negative electrode lower injection-molded boss; 8, negative electrode U-shaped piece; 9, positive electrode stamping cover plate; 10, positive electrode column; 11, cap; 12, sealing rubber plug; 13, positive electrode U-shaped piece; 14, winding core; 1 5. Insulating film; 16. Positive ear; 17. Negative ear; 18. Spacer; 19. Side plate; 20. Negative connecting piece; 21. Positive connecting piece; 23. Positive sheet; 24. Diaphragm; 25. Negative sheet; 26. Anti-mistake limit angle; 27. Boss; 28. Positioning hole; 29. ​​Positive cover plate; 30. Negative cover plate; 31. Negative terminal; 32. Upper injection-molded insulating sheet; 33. Negative column welding sheet; 35. Insulating tape. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0035] As attached Figure 1 -Attached Fig.14 As shown, the present invention is a lithium-ion battery structure, including multiple winding core modules A, connecting sheet modules B, cover module C and aluminum shell module D, the winding core module A includes positive electrode sheet 23, positive electrode ear 16, separator 24, negative electrode sheet 25 and negative electrode ear 17, the positive electrode sheet 23 is coated with positive electrode material on both sides of aluminum foil, the negative electrode sheet 25 is coated with negative electrode material on both sides of copper foil, the positive electrode aluminum foil and the negative electrode copper foil are the current collectors of the battery, the positive electrode sheet 23, the separator 24 and the negative electrode sheet 25 are arranged and connected in a winding manner, and the separator 24 is located between adjacent positive electrode sheets 23 and negative electrode sheets 25. The above structure proposes an improved technical solution to address the deficiencies in the prior art. The lithium-ion battery structure of the present invention includes a plurality of core modules A, a connecting piece module B, a cover module C and an aluminum shell module D, and the structures of the core modules A, the connecting piece module B, the cover module C and the aluminum shell module D are improved in various aspects, and each component is improved in multiple parts. After the plurality of core modules A, the connecting piece module B, the cover module C and the aluminum shell module D are combined and connected with each other, a lithium-ion battery structure is formed. The overall structure solves various problems and achieves various effects through various structures, effectively improving the overall performance. The lithium-ion battery structure of the present invention has a simple structure, effectively prevents metal dust generated during laser welding from entering the module, avoids the risk of short circuit of the lithium-ion battery, improves manufacturing efficiency and qualified rate, greatly improves the energy density of the lithium-ion battery, prevents damage to the core module during the shelling process, and improves the overall performance.

[0036] The connecting piece module B includes a positive connecting piece 21, a negative connecting piece 20, a positive U-shaped piece 13, and a negative U-shaped piece 8. The positive connecting piece 21 and the negative connecting piece 20 are respectively provided with a welding foolproof limit angle 26, and the positive U-shaped piece 13 and the negative U-shaped piece 8 are respectively provided with a boss 27 and a positioning hole 28. The cover plate module C includes a positive cover plate 29 and a negative cover plate 30. The positive cover plate 29 includes a positive stamped cover plate 9, a positive pole column 10, a cap 11 and a sealing plug 12. The positive pole column 10 is connected with the positive stamped cover plate 9 and the aluminum shell, and both are positive poles. The negative pole cover plate 30 includes a negative pole column 2, a sealing ring 3, a negative stamped cover plate 1, a lower injection molded insulating sheet 6, an explosion-proof sheet 5 and an explosion-proof sheet protective film 4, and a negative lower injection molded boss 7. The negative pole column 2 includes a negative pole terminal 31, an upper injection-molded insulating sheet 32 ​​and a negative pole column welding sheet 33. The negative pole terminal 31 is exposed to the outside of the lithium-ion battery. The negative pole stamping cover plate 1 is provided with a cover plate hole. The negative pole stamping cover plate 1 is provided with an undercut hole on the inner side of the lithium-ion battery. The lower injection-molded insulating sheet 6 is provided with a boss on the outer side of the lithium-ion battery. The lower injection-molded insulating sheet 6 is provided with a boss on the inner side of the lithium-ion battery corresponding to the positioning hole 28 on the negative pole U-shaped piece 8. The above structure achieves structural improvement.

[0037] The core module A and the connecting piece module B are fixedly connected by the positive connecting piece 21 and the negative connecting piece 20. The positive connecting piece 21 is respectively fixed to the positive U-shaped piece 13 and the positive ear 16, and the negative connecting piece 20 is respectively fixed to the negative U-shaped piece 8 and the negative ear 17. Multiple core modules A and connecting piece modules B are fixed by spacers 18 and side plates 19 through snap fasteners and are loaded into the aluminum shell module D together. The aluminum shell module D is fixed to the cover module C.

[0038] The connecting piece module B and the cover plate module C are fixed by means of bosses 27 and positioning holes 28, the positive U-shaped piece 13 is respectively fixed to the positive connecting piece 21 and the positive cover plate 29, the negative U-shaped piece 8, the lower injection-molded insulating sheet 6 and the negative stamped cover plate 1 are fixed by positioning holes, bosses and undercut holes, the negative pole column 2 extends into the battery cover plate through the cover plate hole, the negative terminal part is exposed to the outside of the lithium-ion battery, the sealing part is sealed with the cover plate hole, and the sealing part includes a sealing ring.

[0039] The lithium-ion battery structure also includes insulating tape 35. The insulating tape 35 is pasted on the back of the connecting piece of the connecting piece module B and the fixed position of the pole ear. The insulating tape 35 is pasted on the front of the connecting piece and the fixed position of the pole ear and the protective small piece. The spacer 18 and the side plate 19 are fixed by buckles and then combined into an aluminum shell.

[0040] The lithium-ion battery structure also includes an insulating film 15, a spacer 18 and a side plate 19; the insulating film 15 is coated on the core module A, the spacer 18 fixes the pole ears at both ends of the pole piece of the core module, the side plate 19 is fixed on both sides of the core module A, and the spacer 18 and the side plate 19 are connected by a snap.

[0041] The positive electrode stamping cover plate 9 and the negative electrode stamping cover plate 1 are respectively provided with a liquid injection hole and an explosion-proof hole; the explosion-proof sheet is installed on the negative electrode stamping cover plate on the side facing the inside of the winding core body, and the negative electrode stamping cover plate 1 is provided with an explosion-proof hole and an explosion-proof protective film matched with the explosion-proof hole. The lower injection-molded insulating sheet 6 and the sealing ring are both structures made of electrolyte-resistant and high-temperature-resistant materials.

[0042] In the structure of the present invention, the negative electrode cover module includes a negative electrode stamping cover 1, a negative electrode column 2, a sealing ring 3, an explosion-proof membrane 4, an explosion-proof sheet 5, a lower injection-molded insulating sheet 6, a negative electrode lower injection-molded boss 7, and a negative electrode U-shaped piece 8 for connecting the inside of the battery. The positive electrode cover module includes a positive electrode stamping cover 9, a positive electrode column 10, a cap 11 and a sealing plug 12. The positive electrode column 10 is connected to the positive electrode stamping cover 9 and the aluminum shell, and both are positive electrodes. The positive electrode U-shaped piece 13 is fixed to the stamping cover 9 through a positioning hole. The winding core module includes a plurality of winding cores 14 (the positive electrode sheet, the diaphragm, and the negative electrode sheet are completed by winding, and the diaphragm is spaced between the positive electrode sheet and the negative electrode sheet to form a winding core), and the side plate 19 and the spacer 18 are connected by snap buckles to fix the winding core 14. The positive electrode ear 16 is connected to the positive electrode connecting sheet 21, and the negative electrode ear 17 is connected to the negative electrode connecting sheet 20. The outermost side of the winding core 14 is covered with an insulating film 15. The connection module includes a negative U-shaped piece 8, a negative connecting piece 20, a positive U-shaped piece 13, and a positive connecting piece 21. One end of the negative connecting piece 20 is connected to the negative ear 17 by ultrasonic welding, and the other end is connected to the negative U-shaped piece 8 by laser welding. One end of the positive connecting piece 21 is connected to the positive ear 16, and the other end is connected to the positive U-shaped piece 13.

[0043] Compared with the structure of traditional lithium-ion batteries, the lithium-ion battery structure described in the present invention divides the substrate in the cover module into a positive stamped cover and a negative stamped cover; then the positive electrode ear, the positive connecting piece, the positive U-shaped piece and the positive stamped cover are fixed respectively, and the negative electrode ear, the negative connecting piece, the negative U-shaped piece, the lower injection-molded insulating sheet and the negative stamped cover are fixed; at the same time, the connecting piece and the ear are ultrasonically welded, the connecting piece and the U-shaped piece are laser welded, and the large-area laser welding of the U-shaped piece and the cover module is transformed into laser welding of the boss and the pole hole on the pole. At this time, the ultrasonic welding process of the connecting piece and the ear is clean, stable, reliable, and has low energy consumption. At the same time, the welding position of the U-shaped piece, the boss and the pole hole is far away from the opening of the core module, which can effectively prevent metal dust generated during laser welding from entering the interior of the core module and avoid the risk of short circuit of the lithium-ion battery. At the same time, the present invention connects multiple core modules through the positive and negative connecting plates and the positive and negative U-shaped parts on the connecting plate module, and the lithium-ion battery structure also includes insulating tape; the insulating tape is affixed to the back of the connecting plate and the position where the pole ear is fixed, and then the insulating tape is affixed to the front of the connecting plate and the position where the pole ear and the protective small plate are fixed, and then the spacer and the side plate are fixed by buckles and then combined into an aluminum shell module; while the traditional lithium-ion battery structure is that each core module needs to be equipped with an aluminum shell module; therefore, the structure of the present invention can not only save the amount of aluminum shell modules, reduce costs, reduce the number of welding times, improve manufacturing efficiency and qualified rate, but also greatly improve the energy density of the entire lithium-ion battery.

[0044] A through hole is provided on the negative electrode stamping cover plate, and the lower injection-molded insulating sheet covers the side of the negative electrode substrate facing the inside of the core body. The cross section of the lower injection-molded insulating sheet and the through hole is an inverted T-shaped structure, and the inner sealing ring is annular. The upper injection-molded insulating sheet, the sealing ring, the negative electrode column welding sheet, and the negative electrode stamping cover plate through hole overlap each other in the direction perpendicular to the pole column. The middle part has a through structure, and the through structure is coaxially arranged with the through hole. The inner surface of the cover plate through hole contacts the outer surface of the boss through hole on the lower injection-molded insulating sheet, and the outer surface of the cover plate through hole presses the sealing ring. The upper boss of the negative electrode U-shaped part passes through the through hole of the negative electrode stamping cover plate and is fixed with the negative terminal by laser welding. The negative electrode U-shaped part is coaxially arranged with the negative terminal through structure. The positive electrode stamping cover plate and the negative electrode stamping cover plate are respectively provided with a liquid injection hole and an explosion-proof hole; the explosion-proof sheet is installed on the side of the negative electrode stamping cover plate facing the inside of the core body, and the negative electrode stamping cover plate is provided with an explosion-proof hole and an explosion-proof protective film matched with the explosion-proof hole.

[0045] The advantages of the structure of the present invention are: 1) The welding of the connecting piece and the pole ear is completed by ultrasonic welding which is clean, stable, reliable and has low energy consumption, thereby reducing the generation of dust during the welding process, and using insulating tape to prevent the residual dust in the welding area after the welding of the connecting piece and the pole ear from diffusing into the interior of the core body during the subsequent assembly process, thereby avoiding battery short circuit; 2) The insulating film used in the present invention can, on the one hand, fix multiple core bodies together, the spacer ring fixes the pole ears at both ends of the pole piece of the core module, and the side plates are fixed on both sides of the core module. The spacer ring and the side plates are connected by snap-fit, which is convenient for connecting the module and stabilizing the shape of the pole ear, and also convenient for the subsequent transfer of the core module. On the other hand, it can prevent the core module from being damaged during the shelling process. 3) The present invention uses a lower injection-molded insulating sheet to separate the connecting sheet from the stamped cover plate, and the stamped cover plate from the negative pole, to avoid short circuits caused by mutual conduction between the connecting sheet, pole and cover plate; by setting a sealing ring to fit the inner wall of the cover plate hole, and the outer sealing gasket is sleeved on the outer surface of the external lead-out terminal, so that the external lead-out terminal can pass through the cover plate hole and have good sealing with the battery cover plate, effectively avoiding leakage between the inside and outside, and having a good sealing effect. 4) The lower injection-molded insulating sheet, the sealing ring and the upper injection-molded insulating sheet are all made of electrolyte-resistant and high-temperature resistant materials. The above scheme is adopted, and the lower injection-molded insulating sheet, the sealing ring and the upper injection-molded insulating sheet made of electrolyte-resistant and high-temperature resistant materials are provided to effectively avoid corrosion of the three by the electrolyte during the use of the lithium-ion battery and damage to them caused by the heat generated during operation, thereby effectively extending the service life of the three. 5) By setting up explosion-proof devices, using explosion-proof plates, explosion-proof valves and protective patches as explosion-proof devices, when the internal pressure of the battery is too high, the top safety valve will open to exhaust and reduce pressure to avoid explosion. A protective plate is set on the top of the top cover to prevent the chemical substances leaked from the battery from reacting chemically with oxygen in the air under high temperature conditions after the safety valve is opened, which may cause fire. The possibility of explosion during the use of lithium-ion batteries is avoided, the safety of lithium batteries is enhanced, and the safety performance is very high, achieving the best use effect.

[0046] The lithium-ion battery structure described in the present invention includes multiple core modules, connecting piece modules, cover modules and aluminum shell modules. The structures of the core modules, connecting piece modules, cover modules and aluminum shell modules are improved in many aspects. Each component is improved in many parts. After multiple core modules, connecting piece modules, cover modules and aluminum shell modules are combined and connected with each other, a lithium-ion battery structure is formed. The overall structure solves many problems and achieves many effects through various structures. The lithium-ion battery structure described in the present invention effectively prevents metal dust generated during laser welding from entering the module, avoids the risk of short circuit of lithium-ion batteries, improves manufacturing efficiency and qualified rate, greatly improves the energy density of lithium-ion batteries, prevents damage to the core module during the shelling process, and improves the overall performance of the battery.

[0047] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A lithium-ion battery structure, characterized in that: The invention comprises a plurality of winding core modules (A), a connecting sheet module (B), a cover module (C) and an aluminum shell module (D), wherein the winding core module (A) comprises a positive electrode sheet (23), a positive electrode ear (16), a separator (24), a negative electrode sheet (25) and a negative electrode ear (17), wherein the positive electrode sheet (23) has positive electrode materials coated on both sides of an aluminum foil, and the negative electrode sheet (25) has negative electrode materials coated on both sides of a copper foil, and the positive electrode aluminum foil and the negative electrode copper foil are current collectors of the battery, and the positive electrode sheet (23), the separator (24) and the negative electrode sheet (25) are arranged and connected in a winding manner, and the separator (24) is located between adjacent positive electrode sheets (23) and negative electrode sheets (25); The connecting piece module (B) comprises a positive connecting piece (21), a negative connecting piece (20), a positive U-shaped piece (13), and a negative U-shaped piece (8); the positive connecting piece (21) and the negative connecting piece (20) are respectively provided with welding foolproof limit angles (26); the positive U-shaped piece (13) and the negative U-shaped piece (8) are respectively provided with bosses (27) and positioning holes (28); The cover plate module (C) comprises a positive cover plate (29) and a negative cover plate (30), the positive cover plate (29) comprising a positive stamped cover plate (9), a positive pole column (10), a cap (11) and a sealing rubber plug (12), the positive pole column (10) being in communication with the positive stamped cover plate (9) and the aluminum shell (22), all of which are positive poles, the negative cover plate (30) comprising a negative pole column (2), a sealing ring (3), a negative stamped cover plate (1), a lower injection-molded insulating sheet (6), an explosion-proof sheet (5) and an explosion-proof sheet protective film (4), and a lower injection-molded insulating sheet boss (7); The negative electrode column (2) comprises a negative electrode terminal (31), an upper injection-molded insulating sheet (32) and a negative electrode column welding sheet (33); the negative electrode terminal (31) is exposed to the outside of the lithium-ion battery; the negative electrode stamping cover plate (1) is provided with a cover plate hole (34); the negative electrode stamping cover plate (1) is provided with an undercut hole on the inner side of the lithium-ion battery; the lower injection-molded insulating sheet (6) is provided with a boss on the outer side of the lithium-ion battery; the lower injection-molded insulating sheet (6) is provided with a boss on the inner side of the lithium-ion battery corresponding to the positioning hole (28) on the negative electrode U-shaped member (8); The winding core module (A) and the connecting piece module (B) are fixedly connected via a positive connecting piece (21) and a negative connecting piece (20); the positive connecting piece (21) is respectively fixed to the positive U-shaped piece (13) and the positive ear (16); the negative connecting piece (20) is respectively fixed to the negative U-shaped piece (8) and the negative ear (17); the plurality of winding core modules (A) and connecting piece modules (B) are fixed by a spacer (18) and a side plate (19) by snap fastening, and are installed together in an aluminum shell module (D); the aluminum shell module (D) is fixed to the cover plate module (C); The connecting piece module (B) and the cover plate module (C) are fixed via a boss (27) and a positioning hole (28); the positive electrode U-shaped member (13) is respectively fixed to the positive electrode connecting piece (21) and the positive electrode cover plate (29); the negative electrode U-shaped member (8), the lower injection-molded insulating sheet (6) and the negative electrode stamping cover plate (1) are fixed via positioning holes, bosses and undercut holes; the negative electrode column (2) extends into the battery cover plate through the cover plate hole; the negative electrode terminal portion is exposed to the outside of the lithium-ion battery; the sealing portion is sealed with the cover plate hole; and the sealing portion includes a sealing ring.

2. The lithium-ion battery structure according to claim 1, characterized in that: The lithium-ion battery structure further comprises an insulating film (15), a spacer (18) and a side plate (19); the insulating film (15) is coated on the core module (A), the spacer (18) fixes the pole ears at both ends of the pole piece of the core module, the side plate (19) is fixed on both sides of the core module (A), and the spacer (18) and the side plate (19) are connected by a buckle.

3. The lithium-ion battery structure according to claim 2, characterized in that: The lithium-ion battery structure further comprises an insulating tape (35), the insulating tape (35) being adhered to the back of the connecting piece of the connecting piece module (B) and the position where the pole ear is fixed, and the insulating tape (35) being adhered to the front of the connecting piece and the position where the pole ear and the protective small piece are fixed, and the spacer (18) and the side plate (19) are fixed by buckles and then combined and placed in an aluminum shell (22).

4. The lithium-ion battery structure according to claim 1 or 2, characterized in that: The positive electrode stamping cover plate (9) and the negative electrode stamping cover plate (1) are respectively provided with a liquid injection hole and an explosion-proof hole; the explosion-proof sheet is installed on the negative electrode stamping cover plate on the side facing the inside of the winding core body; the negative electrode stamping cover plate (1) is provided with an explosion-proof hole and an explosion-proof protective film cooperating with the explosion-proof hole.

5. The lithium-ion battery structure according to claim 1 or 2, characterized in that: The lower injection-molded insulating sheet (6) and the sealing ring (3) are both structures made of electrolyte-resistant and high-temperature-resistant materials.

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