Lithium ion battery positive electrode material and lithium ion battery

Abstract

The lithium ion battery comprises a first shell, a first storage bin and a second storage bin are arranged in the first shell, a first battery cell and a second battery cell are installed in the first storage bin and the second storage bin respectively, a controller is further installed on the first shell, and the controller is connected with the first storage bin and the second storage bin. The controller is used for monitoring and controlling the current conveying state of the first battery cell and the second battery cell, an opening matched with the second storage bin is formed in the first shell, a supporting assembly matched with the opening is installed on the first shell, and the lithium ion battery further comprises an ultrasonic detection mechanism used for detecting the first battery cell and the second battery cell; and the ultrasonic detection mechanism is used for detecting the internal states of the first battery cell and the second battery cell. Compared with the prior art, the lithium ion battery positive electrode material and the lithium ion battery have the advantages that the service life of the lithium ion battery can be prolonged, and the use safety of the lithium ion battery can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a lithium ion battery positive electrode material and a lithium ion battery. Background Art

[0002] As a widely used power source and energy storage device, lithium-ion batteries play an important role in the fields of electric vehicles and renewable energy storage. However, the overcharge and overload problems of lithium-ion batteries during the charging and discharging process lead to the formation of lithium dendrites inside the battery. Lithium dendrites are some irregular branch-like growth structures that are formed during the lithium ion deposition process. The formation of this structure not only destroys the uniformity and stability inside the battery, but also causes local short circuits inside the battery, significantly reducing the overall efficiency and performance of the battery. Especially in the case of over-discharge, the problem of lithium dendrites is more serious. The presence of lithium dendrites will greatly increase the rate of battery aging and damage, thereby seriously affecting the service life of the battery.

[0003] The local short circuit phenomenon caused by lithium dendrites not only has a negative impact on battery performance, but also further affects the safety of the battery. When lithium dendrites grow to a certain extent inside the battery, they may pierce the battery separator, causing battery bulging, gas leakage, etc. In addition, if lithium dendrites continue to grow inside the battery, they may eventually cause a short circuit, causing the internal temperature of the battery to rise sharply, posing a safety hazard, and may even cause thermal runaway and explosion of the battery, affecting the user's safety and the overall performance of the battery.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a lithium ion battery positive electrode material and a lithium ion battery, which can solve the technical problems raised in the above background technology.

[0006] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows: A lithium ion battery positive electrode material, wherein a slow decay layer is arranged on the surface of the lithium ion battery positive electrode.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows: A lithium-ion battery comprises a lithium-ion battery positive electrode material and a first shell, wherein a first storage bin and a second storage bin are provided in the first shell, wherein a first battery cell and a second battery cell are installed in the first storage bin and the second storage bin respectively, and a controller is also installed on the first shell, wherein the controller is used to monitor and control the current transmission state of the first battery cell and the second battery cell, an opening matching the second storage bin is provided on the first shell, and a support assembly matching the opening is installed on the first shell, wherein the support assembly comprises a base, wherein a convex edge matching the inner wall of the second storage bin is fixedly connected to the base, and the base is detachably mounted on the first shell, an electric telescopic rod is fixedly connected to the middle part of the base, and a support plate is fixedly connected to the output end of the electric telescopic rod, and a suction cup is fixedly connected to the support plate, and a protective assembly matching the second battery cell is installed between the support plate and the base, and the lithium-ion battery further comprises an ultrasonic detection mechanism for detecting the first battery cell and the second battery cell, wherein the ultrasonic detection mechanism is used to detect the internal state of the first battery cell and the second battery cell.

[0008] In one or more embodiments of the present invention, the protective component includes a first box body, a connecting plate is slidably connected to the first box body, a connecting rod is fixedly connected to the upper end of the connecting plate, one end of the connecting rod passes through the top wall of the first box body, the first box body is filled with a first medium, the first medium is located between the connecting plate and the bottom wall of the first box body, the base is located on one side of the first box body and a second box body is also installed, the second box body is filled with a second medium, a first connecting pipe is fixedly connected between the first box body and the second box body, one end of the first connecting pipe is located inside the second box body, a plurality of second through holes are opened on the first connecting pipe located in the second box body, a plurality of discharge holes are opened on the support plate, a second connecting pipe matching the discharge holes is installed between the support plate and the second box body, and the first medium and the second medium are discharged from the discharge holes after mixing in the second box body.

[0009] In one or more embodiments of the present invention, a convex strip is fixedly connected to the inner wall of the second storage bin, and a plurality of arched protrusions are fixedly connected to the convex strip.

[0010] In one or more embodiments of the present invention, a second shell is fixedly connected to the first shell, the controller is located in the second shell, a first electrical connection wire is installed on the first battery cell, a pole is installed on the second battery cell, and a second electrical connection wire matching the pole is installed on the controller, the first electrical connection wires are respectively connected to the controller, and the second battery cell is connected to the controller through the pole and the second electrical connection wire.

[0011] In one or more embodiments of the present invention, a pulse repair component is installed in the second shell, and the pulse repair component processes the lithium dendrites in the first battery cell and the second battery cell in a pulse manner.

[0012] In one or more embodiments of the present invention, the ultrasonic detection mechanism is installed in a second shell, and the ultrasonic detection mechanism includes an ultrasonic detector. A first detection probe and a second detection probe matching the ultrasonic detector are installed in the first shell, and the first detection probe is used to detect the first battery cell, and the second detection probe is used to detect the second battery cell.

[0013] In one or more embodiments of the present invention, a replenishing mechanism is installed in the second shell, and the replenishing mechanism is used to replenish the repair fluid into the first battery cell or the second battery cell. The replenishing mechanism includes a storage tank, and the repair fluid is stored in the storage tank. An infusion tube is installed on the storage tank, and the end of the infusion tube away from the storage tank is fixedly connected to a connector matching the second battery cell, the connector is slidably connected to the second shell, one end of the connector passes through the second shell and the first shell, and one end of the connector is located in the second storage bin, and a bracket is installed on the second shell, an electromagnetic block is installed on the bracket, and a magnet matching the electromagnetic block is fixedly connected to the connector.

[0014] In one or more embodiments of the present invention, the second battery cell includes a first electrode sheet and a separator, an injection tube is arranged between the first electrode sheet and the separator, the injection tube includes a third connecting tube and a fourth connecting tube, the fourth connecting tube is slidably connected in the third connecting tube, the third connecting tube and the fourth connecting tube are respectively provided with a first liquid outlet hole and a second liquid outlet hole, the first liquid outlet hole and the second liquid outlet hole are staggered in the up and down directions, and a tensioning mechanism matching the fourth connecting tube is installed on the connecting head.

[0015] In one or more embodiments of the present invention, a micro battery for supplying power to electronic components in the second shell is installed in the second shell.

[0016] Compared with the prior art, the lithium ion battery positive electrode material and the lithium ion battery of the present invention are provided with a second battery cell. When the lithium ion battery is overcharged or over-discharged, the second battery cell bears the overcharge or over-discharge amount, so that lithium dendrites grow in the second battery cell, and the lithium dendrites in the second battery cell are processed by detection and processing to avoid the lithium dendrites causing thermal runaway, explosion and the like of the lithium ion battery. The second battery cell can be replaced, and the second battery cell can bring the performance to the extreme. Without affecting the normal use of the lithium ion battery, the second battery cell can also ensure the service life of the lithium ion battery, and is easy to replace, thereby reducing the replacement cost of the lithium ion battery, and the safety can also be greatly improved. The positive electrode material of lithium-ion batteries can not only reduce the oxidative decomposition of electrolyte under high voltage, but also help prevent the dissolution of transition metal ions, delay the collapse of the positive electrode material structure, form a dense layer to block direct contact between the electrolyte and the positive electrode, and reduce the attack of corrosive substances such as HF. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a lithium-ion battery in one embodiment of the present invention; Figure 2 is a cross-sectional view of a first shell in one embodiment of the present invention; Figure 3 A partial cross-sectional view of a lithium-ion battery in one embodiment of the present invention Figure 1 ; Figure 4 It is a structural schematic diagram of a support assembly in one embodiment of the present invention; Figure 5 A partial cross-sectional view of a support assembly according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the convex strip in one embodiment of the present invention; Figure 7 A partial cross-sectional view of a lithium-ion battery in one embodiment of the present invention Figure 2 ; Figure 8 A schematic diagram of a partial structure of a lithium-ion battery in one embodiment of the present invention; Fig. 9 for Figure 8 Schematic diagram of the structure at A in the middle; Fig.10 for Figure 8 Schematic diagram of the structure at B in the middle; Fig.11 A schematic diagram of a partial structure of a second electrical connection line in one embodiment of the present invention; Fig.12 Schematic diagram of the partial structure of the second battery cell in one embodiment of the present invention Figure 1 ; Fig.13 Schematic diagram of the partial structure of the second battery cell in one embodiment of the present invention Figure 2 ; Fig.14 for Fig.13 Schematic diagram of the structure at C in the middle; Fig.15 A partial cross-sectional view of a liquid injection tube in one embodiment of the present invention; Fig.16 A lithium-ion battery pulse repair parameter data diagram in one embodiment of the present invention; Fig.17 Schematic diagram of the structure of a positive electrode material for a lithium-ion battery in one embodiment of the present invention.

[0019] Description of main reference numerals: 1. First shell; 101. First storage bin; 102. Second storage bin; 103. First threaded hole; 2. Second shell; 3. First battery cell; 301. First electrical connection line; 4. Second battery cell; 401. First electrode sheet; 402. Spacer; 403. Second electrode sheet; 404. Post; 5. Support assembly; 6. Base; 601. First through hole; 7. Convex edge; 8. Bolt; 9. Electric telescopic rod; 10. Support plate; 1001. Discharge hole; 11. Suction cup; 12. Protection assembly; 13. First box; 14. Connecting plate; 15. Connecting rod; 16. First connecting pipe; 1601. Second through hole; 17. Valve; 18. Second box; 19. Second connecting pipe; 20. Pressure relief valve; 21. Convex strip; 21 01. Arched protrusion; 22. Controller; 23. Positive electrode connecting column; 24. Negative electrode connecting column; 25. Third electrical connecting line; 26. Pulse repair component; 27. First pulse repairer; 28. Second pulse repairer; 29. ​​Ultrasonic detection mechanism; 30. Ultrasonic detector; 31. First detection probe; 32. Second detection probe; 33. Rehydration mechanism; 34. Storage tank; 35. Infusion tube; 36. Pump; 37. Bracket; 38. Electromagnetic block; 39. Magnet; 40. Connector; 4001. Tensioning mechanism; 41. Micro battery; 42. Injection tube; 43. Third connecting tube; 4301. First liquid outlet; 44. Fourth connecting tube; 4401. Second liquid outlet; 45. Decay-resistant layer; 46. Second electrical connecting line. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, 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 creative work should fall within the scope of protection of the present invention.

[0021] like Figure 1 to Figure 7As shown, a lithium-ion battery in one embodiment of the present invention includes a first shell 1, in which a first storage compartment 101 and a second storage compartment 102 are arranged, and the first storage compartment 101 and the second storage compartment 102 are not connected to each other. A first battery cell 3 matching the first storage compartment 101 and a second battery cell 4 matching the second storage compartment 102 are installed in the first shell 1. A controller 22 is installed on the first shell 1, and the controller 22 can control and detect the output and input states of the first battery cell 3 and the second battery cell 4. A first electrical connection line 301 matching the controller 22 is installed on the first battery cell 3, and a pole 404 matching the controller 22 is installed on the second battery cell 4. A second electrical connection line 46 matching the pole 404 is installed on the controller 22, and the second electrical connection line 46 and the pole 404 are in contact.

[0022] Specifically, the controller 22 controls the power of the first battery cell 3 to be maintained between 20% and 80%, and does not control the remaining power of the second battery cell 4. To prevent the electrolyte from decomposing due to the long-term full charge of the lithium battery, the first battery cell 3 stops charging when it is charged to 80% to 90%. When the power is lower than 20%, the first battery cell 3 stops outputting, and only the second battery cell 4 outputs. And the output voltage of the first battery cell 3 is relatively stable to ensure the temperature of the first battery cell 3. When the lithium-ion battery is under load, the second battery cell 4 provides more voltage to protect the first battery cell 3 and extend the service life of the first battery cell 3.

[0023] The second battery cell 4 acts as a bodyguard for the first battery cell 3, so that the first battery cell 3 is not loaded and does not reach high temperature. Therefore, during normal use of the lithium-ion battery, the second battery cell 4 needs to output more voltage. During charging, the overcharge current also enters the second battery cell 4, so the second battery cell 4 is easily damaged. By making the second battery cell 4 detachable, when the second battery cell 4 is damaged, it can be replaced to extend the service life of the lithium-ion battery. At the same time, the lithium-ion battery can also meet the work of various loads.

[0024] like Figure 1 to Figure 6 As shown, an opening is provided at the lower end of the second storage bin 102, and the second battery cell 4 is placed into the second storage bin 102 through the opening, and a support assembly 5 matching the opening is installed on the first shell 1, and the support assembly 5 blocks the opening of the first shell 1 and can seal it, so that the second battery cell 4 is fixed in the second storage bin 102.

[0025] like Figure 1 to Figure 6As shown, the support assembly 5 includes a base 6, and a flange 7 matching the inner wall of the second storage bin 102 is fixedly connected to the base 6. The outer wall of the flange 7 and the inner wall of the second storage bin 102 are interference fit, and the base 6 has the effect of sealing the second storage bin 102. A plurality of first through holes 601 are provided on the base 6, and a first threaded hole 103 matching the first through hole 601 is provided on the first shell 1. A bolt 8 matching the first through hole 601 is installed on the base 6, and the bolt 8 can pass through the first through hole 601 and be threadedly connected to the first threaded hole 103, that is, the base 6 and the first shell 1 are locked by the bolt 8. An electric telescopic rod 9 is fixedly connected to the middle of the base 6, and a support plate 10 is fixedly connected to the output end of the electric telescopic rod 9, and a suction cup 11 matching the second battery cell 4 is fixedly connected to the support plate 10.

[0026] Specifically, since the second battery cell 4 is adsorbed on the suction cup 11, when the controller 22 detects that the second battery cell 4 is abnormal, the electric telescopic rod 9 can be lowered, and the electric telescopic rod 9 lowers the support plate 10, and the second battery cell 4 on the support plate 10 will also be disconnected from the second electrical connection line 46. At this time, the operating battery cell of the lithium-ion battery is only the first battery cell 3. Even if the second battery cell 4 is damaged, it will not affect the normal operation of the lithium-ion battery.

[0027] When installing the second battery cell 4 , firstly, the bottom wall of the second battery cell 4 is adsorbed on the suction cup 11 , and then the second battery cell 4 is inserted into the second storage compartment 102 , and the base 6 and the first shell 1 are fixed by the bolts 8 .

[0028] Preferably, in order to further improve the sealing effect of the support assembly 5 , a sealing structure such as a sealing ring may be provided between the convex edge 7 and the second storage bin 102 .

[0029] like Figure 1 to Figure 5 As shown, a protective component 12 is fixedly connected between the support plate 10 and the base 6. When the second battery cell 4 is overheated or damaged, the protective component 12 can fill the second storage compartment 102 with a protective medium to prevent the high temperature of the second battery cell 4 from being transferred to the first battery cell 3 and affecting the first battery cell 3.

[0030] Specifically, Figure 1 to Figure 5 As shown, the protection assembly 12 includes a first box 13 and a second box 18, which are both fixedly connected to the base 6 and located between the base 6 and the support plate 10. The first box 13 is filled with a first medium, and the second box 18 is filled with a second medium. After the first medium and the second medium are mixed, a heat insulating material is formed and output to the second storage bin 102.

[0031] like Figure 5As shown, the first box body 13 is slidably connected to a connecting plate 14, and the outer wall of the connecting plate 14 is in contact with the inner wall of the first box body 13, so as to form a seal. The upper end of the connecting plate 14 is fixedly connected to a connecting rod 15, which passes through the top wall of the connecting plate 14, and one end of the connecting rod 15 is located above the connecting plate 14. A first connecting pipe 16 is fixedly connected between the first box body 13 and the second box body 18, and a valve 17 is installed on the first connecting pipe 16. The valve 17 is a physical pressure relief valve. When the connecting rod 15 is pressed downward, the connecting plate 14 moves downward with the connecting rod 15 in the first box body 13, and the valve 17 is subjected to excessive pressure. The valve 17 will open, and the first medium enters the second box body 18 through the first connecting pipe 16 to react with the second medium to form a heat-insulating material. A second connecting pipe 19 is installed on the second box body 18 , and the second connecting pipe 19 is communicated with the support plate 10 . A plurality of discharge holes 1001 are opened on the support plate 10 , and the formed heat insulation material is output to the second storage bin 102 through the discharge holes 1001 .

[0032] Specifically, the first medium and the second medium can be a combination of isocyanate and polyol, a combination of sodium bicarbonate and an acidic substance, or a combination of other media, as long as the temperature diffusion of the second battery cell 4 can be suppressed. Among them, the combination of isocyanate and polyol can form a closed-cell foam structure, which expands rapidly and can solidify to form a lightweight, high-strength insulation layer. The combination of sodium bicarbonate and an acidic substance produces carbon dioxide gas and foam, and the foam and carbon dioxide gas are filled into the second storage bin 102, which can also play a certain insulation role.

[0033] like Figure 5 As shown, a section of the first connecting pipe 16 is S-shaped and located in the second box 18, and a plurality of second through holes 1601 are opened in the portion of the first connecting pipe 16 located in the second box 18, so that the first medium can fully contact with the second medium, thereby improving the efficiency of the mixing reaction between the two.

[0034] like Figure 1 to Figure 3 As shown, a pressure relief valve 20 is installed on the first housing 1. The pressure relief valve 20 is used to control the pressure in the second storage bin 102. When the pressure in the second storage bin 102 is too high, the pressure relief valve 20 will release the pressure to prevent the medium from entering the second storage bin 102 too much and causing the first housing 1 to deform. If the medium can be continuously charged into the second storage bin 102, the pressure relief valve 20 will discharge the charged medium and take away the heat in the second storage bin 102.

[0035] In order to allow the medium to fully contact the second battery cell 4, Figure 1 to Figure 6As shown, the inner wall of the second storage bin 102 is fixedly connected with a plurality of convex strips 21, and a plurality of arched protrusions 2101 are arranged on the convex strips 21. When the second battery cell 4 is placed in the second storage bin 102, the arched protrusions 2101 can allow a certain gap between the second battery cell 4 and the inner wall of the second storage bin 102, so that the medium can pass through. The second battery cell 4 is fixed by suction by the suction cup 11, and the suction cup 11 protrudes from the surface of the support plate 10. There is also a gap between the second battery cell 4 and the support plate 10, so that the medium has good fluidity in the second storage bin 102.

[0036] like Figure 1-2 As shown, the second shell 2 is fixedly connected to the first shell 1, the controller 22 is located in the second shell 2, the second electrical connection line 46 passes through the second shell 2 and the first shell 1, and one end of the second electrical connection line 46 protrudes from the inner top wall of the second storage bin 102. The controller 22 is connected to the positive electrode connection column 23 and the negative electrode connection column 24, and the third electrical connection line 25 is connected between the positive electrode connection column 23 and the negative electrode connection column 24 and the controller 22, and the positive electrode connection column 23 and the negative electrode connection column 24 are fixedly connected to the second shell 2.

[0037] By providing the second battery cell 4 to extend the service life of the first battery cell 3, the second battery cell 4 is more likely to be in a state of vulnerable life such as load or overcharge. Figure 7-Figure 8 As shown, a pulse repair component 26 is arranged in the second shell 2, and the pulse repair component 26 includes a first pulse repairer 27 and a second pulse repairer 28, which are respectively installed on the first electrical connection line 301 and the second electrical connection line 46. When the first pulse repairer 27 and the second pulse repairer 28 exist, the first battery cell 3 and the second battery cell 4 are charged in a pulse manner, which can greatly extend the service life of the first battery cell 3 and the second battery cell 4. Pulse current can eliminate or inhibit the growth of lithium dendrites, and the state of lithium dendrites can be changed by pulse current, promoting the uniform deposition of lithium and dissolving existing lithium dendrites.

[0038] like Figure 7-Figure 8 As shown, an ultrasonic detection mechanism 29 is installed in the second shell 2, and the ultrasonic detection mechanism 29 includes an ultrasonic detector 30. A first detection probe 31 and a second detection probe 32 matching the ultrasonic detector 30 are installed in the first shell 1. The first detection probe 31 is used to detect the first battery cell 3, and the second detection probe 32 is used to detect the second battery cell 4. The detection data of the first detection probe 31 and the second detection probe 32 are transmitted to the ultrasonic detector 30, and the ultrasonic detector 30 transmits the output to the controller 22, which analyzes the data and then controls the output state of the ultrasonic detector 30, so that the ultrasonic detector 30 can effectively process the lithium dendrites in the first battery cell 3 and the second battery cell 4.

[0039] When the pulse repair component 26 is in normal use, it charges the first battery cell 3 and the second battery cell 4 by pulses. When the ultrasonic detection mechanism 29 detects that the lithium dendrites in the first battery cell 3 and the second battery cell 4 are abnormal, the pulse repair component 26 intervenes to dissolve the lithium dendrites in the first battery cell 3 and the second battery cell 4 by changing the current density, pulse frequency and duty cycle, and pulse direction.

[0040] During repair, a pulse method is used to preferentially treat the sharp parts of the lithium dendrite. The curvature radius of the dendrite tip is small, and the current density is inversely proportional to the curvature radius. This characteristic needs to be used to concentrate energy to destroy the tip. High current pulses preferentially act on high curvature areas, and the current density in low curvature areas is lower to avoid damaging the electrode body. Local Joule heating must be sufficient to melt / break the dendrites, but avoid overall overheating. Taking preventive inhibition, lithium dendrite repair, and emergency treatment as examples, the specific parameters are as follows: Fig.16 As shown. It is worth noting that the pulse parameter setting needs to be based on the principle of "local high-energy action, global safety and controllability". Through the coordinated design of current density, pulse width and frequency, the tips of high-curvature lithium dendrites are preferentially destroyed. In practical applications, it is necessary to combine experimental calibration, model simulation and dynamic feedback to balance the dendrite suppression effect with battery life and the safety of battery use. Preferably, an intelligent BMS may be developed in the future to achieve fully automatic closed-loop control of "detection → processing → repair".

[0041] like Figure 7 to Figure 15 As shown, a refilling mechanism 33 is installed in the second shell 2, and the refilling mechanism 33 is used to perform final repair on the first battery cell 3 and the second battery cell 4. The refilling mechanism 33 includes a storage tank 34, and the storage tank 34 is filled with lithium trifluoromethylsulfinate. A liquid infusion tube 35 is installed on the storage tank 34. A pump 36 is installed on the liquid infusion tube 35, and a connector 40 is installed at one end of the liquid infusion tube 35 away from the storage tank 34. The connector 40 is perpendicular to the inner bottom wall of the second shell 2, and the connector 40 passes through the second shell 2 and the first shell 1 in sequence, and is slidably connected to the second shell 2 and the first shell 1. The second battery cell 4 is provided with an injection tube 42 that matches the connector 40. The injection tube 42 is plugged into the connector 40. When the connector 40 slides downward to connect with the injection tube 42, the lithium trifluoromethylsulfinate in the storage tank 34 can be transported to the injection tube 42 through the connector 40 by the pump 36, and then the lithium trifluoromethylsulfinate is transported to the second battery cell 4 by the injection tube 42.

[0042] like Figure 7 to Figure 15As shown, the second battery cell 4 includes a first electrode sheet 401, a separator 402, and a second electrode sheet 403. The injection tube 42 is located between the separator 402 and the first electrode sheet 401, and the injection tube 42 can also extend between the second electrode sheet 403 and the separator 402. Since the injection tube 42 is located inside the second battery cell 4, it is necessary to comprehensively consider the chemical stability, mechanical strength, thermal stability and the impact on battery performance. The material of the injection tube 42 is generally ultra-high molecular weight polyethylene, polytetrafluoroethylene and other materials with good tolerance to solvents, acids and alkalis, and is suitable for the transportation of lithium trifluoromethylsulfinate. Depending on the lithium-ion battery pack, the outer diameter of the injection tube 42 is generally 3 to 8 mm. It is worth noting that when selecting materials, reactions with electrode materials or electrolytes should be avoided.

[0043] Specifically, Figure 13 to Figure 15 As shown, the injection tube 42 includes a third connecting tube 43 and a fourth connecting tube 44. The fourth connecting tube 44 is arranged inside the third connecting tube 43, and the fourth connecting tube 44 is slidably connected to the third connecting tube 43. One end of the fourth connecting tube 44 slightly protrudes from the third connecting tube 43, and the fourth connecting tube 44 is connected to the connector 40. A first liquid outlet hole 4301 is provided on the third connecting tube 43, and a second liquid outlet hole 4401 is provided on the fourth connecting tube 44. The first liquid outlet hole 4301 and the second liquid outlet hole 4401 are in a straight line, and the opening directions of the first liquid outlet hole 4301 and the second liquid outlet hole 4401 are both oriented toward the first electrode sheet 401. When the fourth connecting tube 44 slides in the third connecting tube 43, the first liquid outlet hole 4301 and the second liquid outlet hole 4401 can be aligned. That is, lithium trifluoromethylsulfinate enters the fourth connecting tube 44 through the connector 40. When the fourth connecting tube 44 is completely filled with lithium trifluoromethylsulfinate, the fourth connecting tube 44 slides in the third connecting tube 43, aligning the first liquid outlet 4301 with the second liquid outlet 4401, and the lithium trifluoromethylsulfinate in the fourth connecting tube 44 is discharged through the second liquid outlet 4401 and the first liquid outlet 4301, so that the lithium trifluoromethylsulfinate is relatively evenly sprayed onto the first electrode sheet 401. The lithium trifluoromethylsulfinate is fully in contact with the electrolyte, and the contact is even.

[0044] Among them, lithium trifluoromethylsulfinate optimizes electrolyte performance, repairs or stabilizes the SEI film, improves ion transport, and thus repairs battery performance. During the cycle of lithium batteries, the electrolyte will form a SEI film on the electrode surface. If the SEI film is unstable or ruptured, it will cause capacity decay. Lithium trifluoromethylsulfinate may help repair or stabilize the SEI film, reduce side reactions, and extend battery life. As a conductive salt, lithium trifluoromethylsulfinate can increase the ionic conductivity of the electrolyte and improve the transport of lithium ions, thereby improving battery performance, especially under high current density or low temperature conditions. It can also promote uniform lithium deposition, reduce the formation of dendrites, and prevent short circuits.

[0045] Furthermore, the total amount of lithium trifluoromethanesulfinate charged is generally 3 to 5 ml. The second liquid outlet 4401 and the first liquid outlet 4301 are micropores. When the lithium trifluoromethanesulfinate is discharged, the lithium trifluoromethanesulfinate is in the form of microbubbles. When the lithium trifluoromethanesulfinate contacts the first electrode sheet 401, the micro-nano bubbles burst, generating a certain amount of energy to peel off some lithium dendrites on the surface of the separator 402.

[0046] like Figure 7 to Figure 11 As shown, a bracket 37 matching with the connector 40 is fixedly connected inside the second shell 2, an electromagnetic block 38 is fixedly connected to the bracket 37, and a magnet 39 matching with the electromagnetic block 38 is fixedly connected to the connector 40. The electromagnetic block 38 can change the positive and negative poles to control the bracket 37 to slide up and down in the first shell 1. Specifically, when the electromagnetic block 38 is positive, the electromagnetic block 38 and the magnet 39 are in contact with each other, and the second liquid outlet 4401 and the first liquid outlet 4301 are aligned. If the electromagnetic block 38 is negative, the electromagnetic block 38 and the magnet 39 repel each other, and the second liquid outlet 4401 and the first liquid outlet 4301 are in a misaligned state. In this state, the lithium trifluoromethylsulfinate in the fourth connecting tube 44 will not be discharged from the injection tube 42.

[0047] like Fig.11 As shown, the inner wall of the connecting head 40 is installed with a tensioning mechanism 4001 matching the fourth connecting tube 44. The tensioning mechanism 4001 can specifically be a variety of mechanisms such as an air bag and a hydraulic tensioning mechanism. When the connecting head 40 contacts the fourth connecting tube 44, the connecting head 40 and the fourth connecting tube 44 can be clamped. During the sliding process of the connecting head 40, it is sufficient to ensure that the connecting head 40 and the fourth connecting tube 44 do not separate.

[0048] Since various electronic components are arranged in the first shell 1 and the second shell 2, such as the electric telescopic rod 9, the electromagnetic block 38, the pump 36, etc., which need to consume electricity when running, in order to reduce the loss of the first battery cell 3 and the second battery cell 4, a micro battery 41 for powering the electronic components in the second shell 2 and the first shell 1 is arranged in the second shell 2. The micro battery 41 is charged synchronously when the lithium-ion battery is charged.

[0049] When the lithium-ion battery is charged, the pulse repair component 26 performs pulse charging in a preventive suppression state. When the lithium-ion battery is in normal use, the ultrasonic detection mechanism 29 performs intermittent or continuous detection on the first battery cell 3 and the second battery cell 4. Generally, the detection is intermittent. When the battery is cycled 30 to 50 times, the ultrasonic detection mechanism 29 detects the lithium-ion battery once. If the first battery cell 3 and the second battery cell 4 enter the overcharge or over-discharge state due to multiple times, the ultrasonic detection mechanism 29 detects the lithium-ion battery when the battery is cycled 10 to 30 times. In other words, the ultrasonic detection mechanism 29 triggers the detection state according to the use state of the first battery cell 3 and the second battery cell 4. The ultrasonic detection mechanism 29 can detect the growth of lithium dendrites in the first battery cell 3 and the second battery cell 4. The detection results of the ultrasonic detection mechanism 29 are transmitted to the controller 22. The controller 22 determines the state of the lithium-ion battery according to the detection results. According to the growth of lithium dendrites in the lithium-ion battery, pulse parameters such as dendrite repair and emergency treatment are used during charging to achieve preliminary repair of the lithium-ion battery.

[0050] Since the first battery cell 3 is not overcharged or over-discharged, and the second battery cell 4 is overcharged and over-discharged instead of the first battery cell 3, the state inside the second battery cell 4 is worse after long-term use, and the service life of the second battery cell 4 is shorter. Therefore, the frequency of ultrasonic detection mechanism 29 detecting the second battery cell 4 should be higher than that of the first battery cell 3. When it is detected that the inside of the second battery cell 4 cannot be repaired by pulse repair, the liquid replenishing mechanism 33 will add a certain amount of lithium trifluoromethylsulfinate to the second battery cell 4 to repair the inside of the second battery cell 4 by lithium trifluoromethylsulfinate.

[0051] If the second battery cell 4 is damaged or its capacity is insufficient to meet the requirement, the support assembly 5 can be disassembled, and the second battery cell 4 installed in the second storage compartment 102 can be taken out and replaced to ensure the service life of the lithium-ion battery and reduce the replacement cost of the lithium-ion battery. By realizing the self-repair of the lithium-ion battery multiple times, the lithium-ion battery can be fully utilized.

[0052] The lithium-ion battery of the present invention is provided with a second battery cell 4. When overcharging or overdischarging is performed, the second battery cell 4 bears the overcharge or overdischarge electricity, so that lithium dendrites grow in the second battery cell 4, and the lithium dendrites in the second battery cell 4 are processed by detection and processing, so as to avoid the lithium dendrites causing thermal runaway and explosion of the lithium-ion battery. The second battery cell 4 can be replaced as a spare battery cell, which can maximize the performance, and can ensure the service life of the lithium-ion battery without affecting the normal use of the lithium-ion battery. It is easy to replace, reducing the replacement cost of the lithium-ion battery, and the safety can also be greatly improved.

[0053] In one embodiment of the present invention, a lithium-ion battery positive electrode material includes a slow-down layer 45 disposed on the positive electrode of the lithium-ion battery. The slow-down layer 45 can not only reduce the oxidation and decomposition of the electrolyte under high voltage, such as gas and acid production of carbonate solvents, but also prevent the dissolution of transition metal ions, such as Ni³⁺ and Co³⁺, delay the collapse of the positive electrode material structure, form a dense layer to block direct contact between the electrolyte and the positive electrode, and reduce the attack of corrosive substances such as HF. The slow-down layer 45 is made of lithium trifluoromethylsulfinate and Al 2 O 3 、LiAlO 2 A multilayer structure constructed by combining inorganic materials such as sol-gel or atomic layer deposition.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A positive electrode material for a lithium ion battery, characterized in that: A slow-down layer is arranged on the surface of the positive electrode of the lithium-ion battery.

2. A lithium ion battery, characterized in that: The lithium-ion battery positive electrode material according to claim 1 further comprises: A first housing, wherein a first storage compartment and a second storage compartment are disposed in the first housing, wherein a first battery cell and a second battery cell are installed in the first storage compartment and the second storage compartment, respectively, and a controller is also installed on the first housing, wherein the controller is used to monitor and control the current transmission state of the first battery cell and the second battery cell; The first shell is provided with an opening matching the second storage bin, and the first shell is equipped with a support assembly matching the opening; The support assembly includes a base, a convex edge matching the inner wall of the second storage bin is fixedly connected to the base, and the base is detachably mounted on the first shell; An electric telescopic rod is fixedly connected to the middle of the base, an output end of the electric telescopic rod is fixedly connected to a support plate, and a suction cup is fixedly connected to the support plate; A protection component matching the second battery cell is installed between the support plate and the base; The lithium-ion battery further comprises an ultrasonic detection mechanism for detecting the first battery cell and the second battery cell, wherein the ultrasonic detection mechanism is used to detect the internal states of the first battery cell and the second battery cell.

3. A lithium ion battery according to claim 2, characterized in that: The protection assembly comprises a first box body, a connecting plate is slidably connected in the first box body, a connecting rod is fixedly connected to the upper end of the connecting plate, and one end of the connecting rod passes through the top wall of the first box body; The first box is filled with a first medium, and the first medium is located between the connecting plate and the bottom wall of the first box; The base is located on one side of the first box body and is also equipped with a second box body, the second box body is filled with a second medium, a first connecting pipe is fixedly connected between the first box body and the second box body, one end of the first connecting pipe is located inside the second box body, and a plurality of second through holes are opened on the first connecting pipe located in the second box body; The support plate is provided with a plurality of discharge holes, a second connecting pipe matching the discharge holes is installed between the support plate and the second box, and the first medium and the second medium are discharged from the discharge holes after being mixed in the second box.

4. A lithium ion battery according to claim 2 or 3, characterized in that: A convex strip is fixedly connected to the inner wall of the second storage bin, and a plurality of arched protrusions are fixedly connected to the convex strip.

5. A lithium ion battery according to claim 2, characterized in that: The first shell is fixedly connected to a second shell, and the controller is located in the second shell; A first electrical connection wire is installed on the first battery cell, a pole is installed on the second battery cell, and a second electrical connection wire matching the pole is installed on the controller. The first electrical connection wires are respectively connected to the controller, and the second battery cell is connected to the controller through the pole and the second electrical connection wire.

6. A lithium ion battery according to claim 5, characterized in that: A pulse repair component is installed in the second shell, and the pulse repair component processes the lithium dendrites in the first battery cell and the second battery cell in a pulse manner.

7. A lithium ion battery according to claim 6, characterized in that: The ultrasonic detection mechanism is installed in the second shell, and the ultrasonic detection mechanism includes an ultrasonic detector. The first shell is installed with a first detection probe and a second detection probe matching the ultrasonic detector. The first detection probe is used to detect the first battery cell, and the second detection probe is used to detect the second battery cell.

8. A lithium ion battery according to claim 7, characterized in that: A liquid replenishing mechanism is installed in the second shell, and the liquid replenishing mechanism is used to replenish the repair liquid into the first battery cell or the second battery cell; The liquid replenishing mechanism comprises a storage tank, the repair liquid is stored in the storage tank, an infusion tube is installed on the storage tank, and an end of the infusion tube away from the storage tank is fixedly connected to a connector matching the second battery cell; The connector is slidably connected to the second shell, one end of the connector passes through the second shell and the first shell, and one end of the connector is located in the second storage bin; A bracket is installed on the second shell, an electromagnetic block is installed on the bracket, and a magnet matching the electromagnetic block is fixedly connected to the connector.

9. A lithium ion battery according to claim 8, characterized in that: The second battery cell includes a first electrode sheet and a separator, and a liquid injection tube is provided between the first electrode sheet and the separator; The injection pipe comprises a third connecting pipe and a fourth connecting pipe, the fourth connecting pipe is slidably connected in the third connecting pipe, the third connecting pipe and the fourth connecting pipe are respectively provided with a first liquid outlet hole and a second liquid outlet hole, and the first liquid outlet hole and the second liquid outlet hole are staggered in the vertical direction; The connecting head is provided with a tensioning mechanism matching the fourth connecting pipe.

10. A lithium ion battery according to claim 9, characterized in that: A micro battery for supplying power to the electronic components in the second shell is installed in the second shell.

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