Ultralow-temperature lithium battery and processing technology thereof

Abstract

The ultralow-temperature lithium battery comprises a shell, a lithium battery main body, a lithium manganate positive plate and a graphite negative plate, the lithium battery main body is arranged in the shell, the lithium manganate positive plate and the graphite negative plate are sequentially arranged in the lithium battery main body, and an isolating membrane is arranged between the lithium manganate positive plate and the graphite negative plate. The interior of the lithium battery main body is uniformly filled with electrolyte, two ends of the top of the lithium battery main body are respectively provided with a positive tab and a negative tab, two sides of the interior of the shell are uniformly provided with grooves, and the interior of each groove is provided with a rubber body. By installing the shell, the lithium battery main body, the groove, the rubber body, the contact piece, the pipe sleeve, the core column, the cavity, the guide groove and the guide block, the integrity of the shell can still be kept in an extremely low-temperature environment, and the safety problems of internal short circuit or electrolyte leakage and the like caused by external pressure are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-low temperature lithium batteries, and in particular to an ultra-low temperature lithium battery and a processing technology thereof. Background Art

[0002] Ultra-low temperature lithium battery is a battery designed for equipment working at extremely low temperatures. Its structure is similar to that of ordinary lithium batteries, but it uses special materials to ensure the discharge function of lithium batteries in low temperature environments, enabling it to maintain a high discharge capacity and working performance at extremely low temperatures.

[0003] In ultra-low temperature environments, the materials inside the battery may undergo changes in physical and chemical properties due to the decrease in temperature, such as an increase in electrolyte viscosity and embrittlement of electrode materials. These changes may cause the battery to be more susceptible to deformation or breakage when subjected to external pressure. If the battery's compressive resistance is insufficient, it may deform or fail under these impacts, thereby affecting the performance and safety of the entire battery pack. Summary of the invention

[0004] The object of the present invention is to provide an ultra-low temperature lithium battery to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ultra-low temperature lithium battery, comprising a shell, a lithium battery body, a lithium manganese oxide positive electrode sheet and a graphite negative electrode sheet, the shell is provided with a lithium battery body, and the lithium manganese oxide positive electrode sheet and the graphite negative electrode sheet are sequentially provided inside the lithium battery body, an isolation film is provided between the lithium manganese oxide positive electrode sheet and the graphite negative electrode sheet, the interior of the lithium battery body is uniformly filled with electrolyte, the two ends of the top of the lithium battery body are respectively provided with a positive electrode ear and a negative electrode ear, grooves are uniformly provided on both sides of the shell, and rubber bodies are provided inside the grooves, one end of the rubber body close to the lithium battery body is connected to the lithium battery body through a contact piece, and a tube sleeve is provided at a central position inside the rubber body, and a core column is embedded inside the tube sleeve.

[0006] Preferably, mounting ears are provided at the bottom ends of both sides of the shell, and the mounting ears are both in an "L"-shaped structure.

[0007] Preferably, a fan is arranged at the bottom of the shell through a bracket, and main blades are evenly distributed on the outside of the fan, and reinforcement parts are arranged at the ends of the main blades.

[0008] Preferably, heat dissipation fins are evenly arranged on the top of the shell, and the top ends of the heat dissipation fins extend to contact the bottom of the lithium battery body.

[0009] Preferably, insulating sheets are provided on the outer sides of the positive electrode lug and the negative electrode lug, and the insulating sheets are made of polymer composite materials.

[0010] Preferably, auxiliary blades are evenly arranged at the central position of the top of the fan, and air ducts are formed between the auxiliary blades.

[0011] Preferably, the electrolyte is filled in the gaps between the lithium manganese oxide positive electrode sheet, the graphite negative electrode sheet and the isolation membrane, and the electrolyte is made of a carbonate solvent containing a special additive.

[0012] Preferably, guide grooves are arranged on both sides of the groove, and guide blocks matching the guide grooves are arranged on both sides of the rubber body.

[0013] Preferably, cavities are formed around the rubber body, and the cavities are distributed in a concentric circle structure around the core column.

[0014] A processing technology for an ultra-low temperature lithium battery comprises the following steps: firstly, welding a positive electrode ear on one side of a lithium manganate positive electrode sheet, welding a negative electrode ear on one side of a graphite negative electrode sheet, and winding the lithium manganate positive electrode sheet, the graphite negative electrode sheet and an isolation film to form a battery core; then, placing the welded lithium manganate positive electrode sheet and the graphite negative electrode sheet into a lithium battery body, injecting electrolyte, and sealing the lithium battery body; finally, sealing the insulating sheets on the outside of the positive electrode ear and the negative electrode ear with the lithium battery body by heating to form a tight packaging structure, effectively preventing the occurrence of liquid leakage and electric leakage, and placing the lithium battery body into a shell, evenly opening grooves on both sides of the shell, and providing rubber bodies in the grooves, one end of the rubber bodies being fixedly connected to the lithium battery body through a contact piece.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the ultra-low temperature lithium battery is installed with a shell, a lithium battery body, a groove, a rubber body, a contact piece, a sleeve, a core column, a cavity, a guide groove and a guide block, one end of the rubber body is connected to the lithium battery body through the contact piece, when the shell is subjected to external pressure, the rubber body can be compressed, and a large amount of energy is absorbed through the elastic characteristics of the rubber body itself and converted into heat energy or other forms of energy, this energy conversion process helps to reduce the direct effect of the impact force on the lithium battery body, thereby playing a protective role, a sleeve is provided at the central position inside the rubber body, and the core column is embedded in the sleeve, which is beneficial to increase the structural strength of the rubber body while ensuring elasticity, so that it is not easy to deform and twist, and at the same time, the inside of the rubber body is evenly provided with cavities, which is beneficial to better disperse the pressure, improve the pressure resistance and buffering effect, ensure that the shell can still maintain its integrity in an extremely low temperature environment, and avoid safety problems such as internal short circuit or electrolyte leakage caused by external pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a front cross-sectional structural schematic diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the lithium battery body of the present invention;

[0019] Figure 3 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0020] Figure 4 It is a schematic diagram of the fan structure from a top view of the present invention;

[0021] Figure 5 For the present invention Figure 1 The enlarged structural diagram at B in the middle;

[0022] Figure 6 It is a processing flow chart of the present invention.

[0023] In the figure: 1. Shell; 2. Lithium battery body; 3. Positive ear; 4. Negative ear; 5. Bracket; 6. Fan; 7. Mounting ear; 8. Insulating sheet; 9. Electrolyte; 10. Lithium manganate positive electrode sheet; 11. Isolation membrane; 12. Graphite negative electrode sheet; 13. Groove; 14. Rubber body; 15. Cavity; 16. Sleeve; 17. Contact piece; 18. Guide block; 19. Guide groove; 20. Core column; 21. Auxiliary blade; 22. Reinforcement part; 23. Air duct; 24. Main blade; 25. Heat sink. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-6 , an embodiment provided by the present invention: an ultra-low temperature lithium battery, comprising a shell 1, a lithium battery body 2, a lithium manganate positive electrode sheet 10 and a graphite negative electrode sheet 12, the shell 1 is provided with the lithium battery body 2, and the lithium manganate positive electrode sheet 10 and the graphite negative electrode sheet 12 are sequentially provided inside the lithium battery body 2, and a separator 11 is provided between the lithium manganate positive electrode sheet 10 and the graphite negative electrode sheet 12;

[0026] The interior of the lithium battery body 2 is uniformly filled with electrolyte 9, and the two ends of the top of the lithium battery body 2 are respectively provided with a positive electrode ear 3 and a negative electrode ear 4;

[0027] A positive electrode ear 3 is welded on one side of the lithium manganese oxide positive electrode sheet 10, and a negative electrode ear 4 is welded on one side of the graphite negative electrode sheet 12. The lithium manganese oxide positive electrode sheet 10, the graphite negative electrode sheet 12 and the separator 11 are then wound to form a battery cell, which is then placed in a lithium battery body 2 and injected with an electrolyte 9.

[0028] The electrolyte 9 is filled in the gap between the lithium manganese oxide positive electrode sheet 10, the graphite negative electrode sheet 12 and the isolation film 11, and the electrolyte 9 is made of a carbonate solvent containing a special additive;

[0029] It can improve the low-temperature performance of the electrolyte 9, reduce the viscosity of the electrolyte 9, and increase the diffusion rate of lithium ions, thereby ensuring that the lithium battery body 2 can discharge normally at low temperatures;

[0030] The outer sides of the positive electrode ear 3 and the negative electrode ear 4 are both provided with insulating sheets 8, and the insulating sheets 8 are both made of polymer composite materials;

[0031] The insulating sheet 8 outside the positive electrode ear 3 and the negative electrode ear 4 is sealed with the lithium battery body 2 by heating to form a tight packaging structure, which effectively prevents the occurrence of liquid leakage and electric leakage;

[0032] Grooves 13 are evenly formed on both sides of the housing 1, and rubber bodies 14 are disposed inside the grooves 13. One end of the rubber body 14 close to the lithium battery body 2 is connected to the lithium battery body 2 through a contact 17.

[0033] When the shell 1 is subjected to external pressure, the rubber body 14 may be compressed, and a large amount of energy may be absorbed through the elastic characteristics of the rubber body 14 itself and converted into heat energy or other forms of energy. This energy conversion process helps to reduce the direct effect of the impact force on the lithium battery body 2, thereby playing a protective role;

[0034] A sleeve 16 is provided at the central position inside the rubber body 14, and a core column 20 is embedded inside the sleeve 16, which is beneficial to increase the structural strength of the rubber body 14 while ensuring elasticity, so that it is not easy to deform or twist;

[0035] Both sides of the groove 13 are provided with guide grooves 19, and both sides of the rubber body 14 are provided with guide blocks 18 matching the guide grooves 19 to limit the position of the rubber body 14;

[0036] The rubber body 14 is provided with cavities 15 on all sides, and the cavities 15 are distributed in a concentric circle structure around the core column 20, which is conducive to better dispersing pressure and improving the pressure resistance and buffering effect;

[0037] By improving the external pressure resistance of the lithium battery body 2, it is ensured that the lithium battery body 2 can still maintain its integrity in an extremely low temperature environment, avoiding safety problems such as internal short circuit or electrolyte 9 leakage caused by external pressure;

[0038] The bottom ends of both sides of the housing 1 are provided with mounting ears 7, and the mounting ears 7 are both in an "L"-shaped structure, which are used to install and fix the housing 1;

[0039] A fan 6 is provided at the bottom of the housing 1 through a bracket 5, and main blades 24 are evenly distributed on the outside of the fan 6. The ends of the main blades 24 are provided with reinforcement parts 22 to improve the overall structural strength of the main blades 24.

[0040] The top of the housing 1 is evenly provided with heat dissipation fins 25, and the tops of the heat dissipation fins 25 are extended to contact the bottom of the lithium battery body 2. When the lithium battery body 2 is working, the heat is absorbed by the heat dissipation fins 25 and discharged out of the housing 1. At the same time, the operation of the fan 6 drives the main blades 24 to rotate to evacuate the heat.

[0041] Auxiliary blades 21 are evenly arranged at the central position of the top of the fan 6, and air ducts 23 are formed between the auxiliary blades 21. When the auxiliary blades 21 rotate, the airflow flows along the air duct 23 to the main blades 24, and moves together with the airflow generated by the main blades 24, thereby increasing the wind force of the fan 6 and improving the heat dissipation effect;

[0042] The specific model and specifications of the fan 6 need to be determined by the selection calculation based on the specification parameters of the device, and the selection calculation method is a prior art, so it will not be described in detail;

[0043] A processing technology for an ultra-low temperature lithium battery comprises the following steps: firstly, welding a positive electrode ear 3 on one side of a lithium manganate positive electrode sheet 10, welding a negative electrode ear 4 on one side of a graphite negative electrode sheet 12, and winding the lithium manganate positive electrode sheet 10, the graphite negative electrode sheet 12 and an isolation film 11 to form a battery core; then, placing the welded lithium manganate positive electrode sheet 10 and the graphite negative electrode sheet 12 into a lithium battery body 2, injecting an electrolyte 9, and sealing the lithium battery body 2; finally, sealing the insulating sheet 8 on the outside of the positive electrode ear 3 and the negative electrode ear 4 with the lithium battery body 2 by heating to form a tight packaging structure, effectively preventing the occurrence of liquid leakage and electric leakage, and placing the lithium battery body 2 into a shell 1, evenly opening grooves 13 on both sides of the shell 1, and providing a rubber body 14 in the grooves 13, and fixing one end of the rubber body 14 with the lithium battery body 2 through a contact piece 17.

[0044] Working principle: When the embodiment of the present application is in use, the positive ear 3 is welded on one side of the lithium manganese oxide positive electrode sheet 10, and the negative ear 4 is welded on one side of the graphite negative electrode sheet 12. Then, the lithium manganese oxide positive electrode sheet 10, the graphite negative electrode sheet 12 and the isolation film 11 are wound to form a battery core, which is then placed in the lithium battery body 2 and injected with electrolyte 9. The electrolyte 9 is made of a carbonate solvent containing special additives. These additives can improve the low-temperature performance of the electrolyte 9, reduce the viscosity of the electrolyte 9, and increase the diffusion rate of lithium ions, thereby ensuring that the lithium battery body 2 can discharge normally at low temperatures. The lithium battery body 2 is then sealed to ensure that the electrolyte 9 does not leak. The insulating sheet 8 on the outside of the positive ear 3 and the negative ear 4 is sealed with the lithium battery body 2 by heating to form a tight packaging structure, which effectively prevents leakage and leakage. Then, the lithium battery body 2 is placed in the shell 1, and recesses are evenly opened on both sides of the inside of the shell 1. The groove 13 and the recess 13 are both provided with a rubber body 14, and one end of the rubber body 14 is fixedly connected to the lithium battery body 2 through a contact piece 17. When the shell 1 is subjected to external pressure, the rubber body 14 can be compressed, and a large amount of energy is absorbed through the elastic characteristics of the rubber body 14 itself and converted into heat energy or other forms of energy. This energy conversion process helps to reduce the direct effect of the impact force on the lithium battery body 2, thereby playing a protective role. A tube sleeve 16 is provided at the central position inside the rubber body 14, and a core column 20 is embedded in the tube sleeve 16, which is beneficial to increase the structural strength of the rubber body 14 while ensuring elasticity, so that it is not easy to deform and twist. At the same time, the inside of the rubber body 14 is evenly provided with cavities 15, which is beneficial to better disperse the pressure, improve the pressure resistance and buffering effect, and ensure that the lithium battery body 2 can still maintain its integrity in an extremely low temperature environment, avoiding safety problems such as internal short circuit or leakage of electrolyte 9 caused by external pressure.

[0045] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all 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.

Claims

1. An ultra-low temperature lithium battery, characterized in that: The invention comprises a shell (1), a lithium battery body (2), a lithium manganate positive electrode sheet (10) and a graphite negative electrode sheet (12); the shell (1) is provided with a lithium battery body (2), and the lithium manganate positive electrode sheet (10) and the graphite negative electrode sheet (12) are sequentially provided inside the lithium battery body (2); a separation film (11) is provided between the lithium manganate positive electrode sheet (10) and the graphite negative electrode sheet (12); the inside of the lithium battery body (2) is uniformly filled with an electrolyte (9); the lithium battery body ( 2) A positive electrode ear (3) and a negative electrode ear (4) are respectively arranged at the two ends of the top, grooves (13) are evenly opened on both sides of the shell (1), and a rubber body (14) is arranged inside the groove (13), and the end of the rubber body (14) close to the lithium battery body (2) is connected to the lithium battery body (2) through a contact piece (17), and a tube sleeve (16) is arranged at the central position inside the rubber body (14), and a core column (20) is embedded inside the tube sleeve (16).

2. The ultra-low temperature lithium battery according to claim 1, characterized in that: The bottom ends of both sides of the shell (1) are provided with mounting ears (7), and the mounting ears (7) are both in an "L"-shaped structure.

3. The ultra-low temperature lithium battery according to claim 1, characterized in that: A fan (6) is arranged at the bottom of the housing (1) via a bracket (5), and main blades (24) are evenly distributed on the outside of the fan (6), and reinforcement parts (22) are arranged at the ends of the main blades (24).

4. The ultra-low temperature lithium battery according to claim 1, characterized in that: The top of the shell (1) is evenly provided with heat dissipation fins (25), and the top ends of the heat dissipation fins (25) extend to contact the bottom of the lithium battery body (2).

5. The ultra-low temperature lithium battery according to claim 1, characterized in that: Insulating sheets (8) are provided on the outside of the positive electrode lug (3) and the negative electrode lug (4), and the insulating sheets (8) are made of polymer composite materials.

6. The ultra-low temperature lithium battery according to claim 3, characterized in that: Auxiliary blades (21) are evenly arranged at the central position of the top of the fan (6), and air ducts (23) are formed between the auxiliary blades (21).

7. The ultra-low temperature lithium battery according to claim 1, characterized in that: The electrolyte (9) is filled in the gaps between the lithium manganate positive electrode sheet (10), the graphite negative electrode sheet (12) and the isolation film (11), and the electrolyte (9) is made of a carbonate solvent containing a special additive.

8. The ultra-low temperature lithium battery according to claim 1, characterized in that: Both sides of the groove (13) are provided with guide grooves (19), and both sides of the rubber body (14) are provided with guide blocks (18) matching the guide grooves (19).

9. The ultra-low temperature lithium battery according to claim 1, characterized in that: The rubber body (14) is provided with cavities (15) on all sides thereof, and the cavities (15) are distributed in a concentric circle structure around the core column (20).

10. A processing technology for ultra-low temperature lithium battery, characterized in that: First, a positive electrode ear (3) is welded on one side of a lithium manganese oxide positive electrode sheet (10), a negative electrode ear (4) is welded on one side of a graphite negative electrode sheet (12), and the lithium manganese oxide positive electrode sheet (10), the graphite negative electrode sheet (12) and the isolation film (11) are wound to form a battery cell; then, the welded lithium manganese oxide positive electrode sheet (10) and the graphite negative electrode sheet (12) are placed in a lithium battery body (2), and an electrolyte (9) is injected, and the lithium battery body (2) is sealed; finally, The insulating sheets (8) on the outside of the positive electrode ears (3) and the negative electrode ears (4) are sealed with the lithium battery body (2) by heating to form a tight packaging structure, which effectively prevents the occurrence of liquid leakage and electric leakage. The lithium battery body (2) is placed in a shell (1), and grooves (13) are evenly provided on both sides of the shell (1). Rubber bodies (14) are arranged in the grooves (13), and one end of the rubber body (14) is fixedly connected to the lithium battery body (2) through a contact piece (17).

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