CN207637926U - rechargeable lithium battery - Google Patents

Abstract

The utility model discloses a chargeable lithium battery, including lithium cell body, protection device, lithium cell body sets up in protection device, protection device includes protecting sheathing and sealed lid, sealed lid closes on protecting sheathing, lithium cell body includes positive electrode post, negative electrode post and lithium cell casing, positive electrode post and negative electrode post set up in lithium cell casing and extend to outside the protection device, be equipped with electric core and electrolyte in the lithium cell casing, electric core includes positive plate, negative pole piece and the barrier film between positive plate and negative pole piece, the negative pole piece include negative current collector and welding and negative pole utmost point ear on the negative current collector, the surface electroplating of negative pole mass flow has the metal lithium layer, leave the cavity between lithium cell body and the protection device, the cavity intussuseption is filled with the coolant liquid. The utility model discloses energy density is high, and the protection is insulating effectual, and output voltage is stable, and the cooling effect is good.

Description

rechargeable lithium battery

technical field

The utility model relates to the field of batteries, in particular to a rechargeable lithium battery.

Background technique

Among all forms of energy, electric energy is the easiest to use, the cleanest, the most environmentally friendly, and the most efficient energy. Batteries are the best device for storing electric energy. Among all battery products, lithium batteries are currently the youngest, most advanced, and technologically advanced in the world. Energy products with the highest gold content and the highest energy density, lithium batteries have the advantages of wide working range, stable discharge voltage, low self-discharge rate, long service life, etc., and have been widely used in various fields, especially aerospace, military, long-term In recent years, with the continuous development of science and technology, the functions of electronic equipment have been continuously upgraded in the fields of life-span instrumentation, logistics tracking, cycling automotive electronics, and mobile digital products. Therefore, better requirements have been put forward for the energy and rate performance of lithium batteries. High-energy batteries have become a key research direction in the battery industry.

Rechargeable lithium batteries currently on the market have the following deficiencies:

1. The theoretical gram capacity of the negative electrode carbon material of rechargeable lithium batteries is low, and in the structure of conventional lithium batteries, although the power density of the battery is increased by winding or stacking, the energy density of the battery is reduced, so conventional The structure of rechargeable lithium batteries is not conducive to improving the energy density of batteries.

2. During the process of manufacturing and processing the battery, the electrode package will be subjected to various extrusion deformations, which will easily cause the internal electrolyte to leak, and it is difficult to ensure uniform performance standards of the battery.

3. Due to the need for long-term cycle charging of lithium batteries, the temperature of lithium batteries during charging is too high, and the charging duration is too long, lithium batteries often experience hollowing and deformation.

Contents of the invention

In order to solve the above problems, the utility model provides a rechargeable lithium battery, which has high energy density, good protection and insulation effect, stable output voltage and good cooling effect.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a rechargeable lithium battery, including a lithium battery body and a protection device, the lithium battery body is arranged in the protection device, and the protection device includes a protective shell and a sealing cover , the sealing cover is closed on the protective casing, the inner bottom surface of the protective casing is provided with a first fixing seat, the lower part of the sealing cover is provided with a second fixing seat, and the lithium battery body includes a positive electrode column, a negative electrode A column and a lithium battery casing, the lithium battery casing is fixedly installed between the first fixing seat and the second fixing seat, one end of the positive electrode column and the negative electrode column is arranged in the lithium battery casing, the positive electrode column and the negative electrode The other end of the column passes through the first fixed seat and the sealing cover and extends to the outside of the protective casing; the lithium battery casing is provided with an electric core and an electrolyte, and the electric core includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet are stacked on each other, and the separator is arranged between the positive electrode sheet and the negative electrode sheet; the positive electrode sheet includes a positive electrode current collector and a positive electrode tab welded on the positive electrode current collector, and the positive electrode current collector Both sides are provided with positive electrode active materials, the negative electrode sheet includes a negative electrode current collector and a negative electrode tab welded to the negative electrode current collector, the surface of the negative electrode current collector is electroplated with a metal lithium layer; the lithium battery body and protection device A cavity is left in between, and the cavity is filled with cooling liquid.

Further, a bottom film is provided at the connection between the lithium battery casing and the first fixing seat, and a top film is provided at the connection between the sealing cover and the second fixing seat.

Further, the negative electrode current collector is made of metal foil or metal mesh; the positive electrode current collector is made of aluminum foil.

Further, a cooling liquid hole is provided on the surface of the sealing cover, and a sealing plug is detachably arranged in the cooling liquid hole.

Further, the isolation film is a polyethylene-polypropylene-polyethylene composite layer isolation film.

Further, a silica gel sheet is provided between the positive electrode column, the negative electrode column and the sealing cover.

Further, the electrolyte is made of hexafluorophosphate.

Further, the cross section of the negative electrode current collector has a concave-convex structure.

The beneficial effects of the utility model are:

1. The lithium battery negative pole of the utility model does not need to be coated with negative active materials, which simplifies the process and is simple and convenient to operate. By electroplating a metal lithium layer on the surface of the negative pole, the high energy and rechargeable primary lithium battery are effectively combined. The high-power characteristics of lithium batteries can meet the stable voltage requirements of electronic equipment.

2. The lithium battery body is placed in the protection device. Under the action of the protection device, the protection and insulation effects of the lithium battery are good, and the fixing effect on the electrode package is good.

3. A coolant is filled between the lithium battery body and the protection device. When the temperature of the lithium battery is too high, the coolant is used to cool the lithium battery, which prolongs the service life of the lithium battery and avoids damage caused by the lithium battery. The temperature is too high, resulting in the risk of explosion.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model.

Description of reference numerals: 1. Positive electrode column; 2. Negative electrode column; 3. Protective shell; 4. Sealing cover; 5. Lithium battery shell; Core; 9. Positive plate; 10. Negative plate; 11. Isolation film; 12. Positive tab; 13. Negative tab; 14. Bottom film; 15. Top film; 16. Sealing plug;

Detailed ways

Please refer to Figure 1, the utility model relates to a rechargeable lithium battery, including a lithium battery body and a protection device, the lithium battery body is arranged in the protection device, and the protection device includes a protective shell 3 and a sealing cover 4, The sealing cover 4 is closed on the protective shell 3, the inner bottom surface of the protective shell 3 is provided with a first fixing seat 6, the lower part of the sealing cover 4 is provided with a second fixing seat 7, and the lithium battery body includes a positive An electrode column 1, a negative electrode column 2 and a lithium battery casing 5, the lithium battery casing 5 is fixedly installed between the first fixing seat 6 and the second fixing seat 7, one end of the positive electrode column 1 and the negative electrode column 2 Set in the lithium battery casing 5, the other end of the positive electrode column 1 and the negative electrode column 2 passes through the first fixing seat 6 and the sealing cover 4 and extends to the outside of the protective casing 3; the lithium battery casing is provided with a cell 8 and electrolyte solution, the cell 8 includes a positive electrode sheet 9, a negative electrode sheet 10, and a separator 11, the positive electrode sheet 9 and the negative electrode sheet 10 are stacked on each other, and the separator 11 is arranged between the positive electrode sheet 9 and the negative electrode sheet 10 The positive electrode sheet 9 includes a positive electrode current collector and a positive electrode tab 12 welded on the positive electrode current collector, the two sides of the positive electrode current collector are provided with positive active materials, and the negative electrode sheet 10 includes a negative electrode current collector and a welded and welded electrode. The negative electrode tab 13 on the negative electrode current collector, the surface of the negative electrode current collector is electroplated with a metal lithium layer; there is a cavity between the lithium battery body and the protection device, and the cavity is filled with cooling liquid.

When in use, the lithium battery negative pole of the utility model does not need to be coated with negative active materials, which simplifies the process and is simple and convenient to operate. By electroplating a metal lithium layer on the surface of the negative pole 2, it effectively combines the high energy of the primary lithium battery. And the high power characteristics of rechargeable lithium batteries can meet the stable voltage use of electronic equipment. The lithium battery body is set in the protection device. Under the action of the protection device, the protection and insulation effects of the lithium battery are good, and the lithium battery shell is fixed. Well, a coolant is filled between the lithium battery body and the protection device. When the temperature of the lithium battery is too high, the coolant is used to cool down the lithium battery, which prolongs the service life of the lithium battery and avoids damage caused by the lithium battery. The temperature is too high, resulting in the risk of explosion.

Further, a bottom film 14 is provided at the connection between the lithium battery casing 5 and the first fixing seat 6 , and a top film 15 is provided at the connection between the lithium battery casing 5 and the second fixing seat 7 . The lithium battery can be better fixed and insulated, and the use is safer and more convenient.

Further, a power indicator light is provided on the sealing cover 4 . You can more intuitively understand the power status of the lithium battery, and you can charge it in time.

Further, the negative electrode current collector is made of metal foil or metal mesh, and the positive electrode current collector is made of aluminum foil.

Further, a cooling liquid hole is provided on the surface of the sealing cover 4, and a sealing plug 16 is detachably arranged in the cooling liquid hole. The cooling liquid can be replaced in time through the cooling liquid hole, and the design of the sealing plug can prevent the leakage of the cooling liquid.

Further, the isolation film 11 is a polyethylene-polypropylene-polyethylene composite layer isolation film.

Further, a silica gel sheet 17 is provided between the positive electrode column 1 , the negative electrode column 2 and the sealing cover 4 . The positive electrode column 1 and the negative electrode column 2 have a good insulation effect, and can prevent electrolyte or cooling fluid from leaking.

Further, the electrolyte is made of hexafluorophosphate.

Further, the cross section of the negative electrode current collector has a concave-convex structure. It can provide space for the current collector to expand and contract, increase the loading capacity of metal lithium per unit area, avoid the fracture of the positive electrode current collector and negative electrode current collector due to the volume expansion of lithium plating, and increase the electrolyte retention in the battery.

The above embodiment is only a description of the preferred implementation of the utility model, and is not intended to limit the scope of the utility model. On the premise of not departing from the design spirit of the utility model, ordinary engineers and technicians in the field made the technical solution of the utility model Various modifications and improvements should fall within the protection scope determined by the claims of the present utility model.

Claims (8)

1. a kind of rechargeable lithium battery, it is characterised in that：Including lithium battery ontology, protective device, the lithium battery ontology setting In protective device, the protective device includes protection shell and sealing cover, and the sealing cover lid closes on protection shell, described Shell inner bottom surface is protected to be equipped with the first fixed seat, the sealing cover lower part is equipped with the second fixed seat, the lithium battery ontology packet Positive electricity pole, negative electricity pole and li battery shell are included, the li battery shell is fixedly mounted on the first fixed seat and is fixed with second Between seat, one end of the positive electricity pole and negative electricity pole is arranged in li battery shell, positive electricity pole and negative electricity pole it is another One end passes through the first fixed seat and sealing cover and extends to outside protection shell；Battery core and electrolysis are equipped in the li battery shell Liquid, the battery core include positive plate, negative plate, isolation film, the mutual lamination of the positive plate, negative plate, and isolation film setting exists Between positive plate, negative plate；The positive plate includes plus plate current-collecting body and the positive pole ear that is welded on the plus plate current-collecting body, The two sides of the plus plate current-collecting body is provided with positive electrode active materials, and the negative plate includes that negative current collector and welding are born with described The electroplating surface of negative lug on the collector of pole, the negative current collector has metallic lithium layer；The lithium battery ontology and protection There are cavity between device, the cavity is interior to be filled with coolant liquid.

2. rechargeable lithium battery according to claim 1, it is characterised in that：The li battery shell and the first fixed seat connect It meets place and is equipped with counterdie, the sealing cover and the second fixed seat junction are equipped with teleblem.

3. rechargeable lithium battery according to claim 1, it is characterised in that：Negative current collector uses metal foil or metal Net is made；The plus plate current-collecting body is made of aluminium foil.

4. rechargeable lithium battery according to claim 1, it is characterised in that：The sealing cap surface is equipped with cooling fluid apertures, It is detachably provided with sealing-plug in the cooling fluid apertures.

5. rechargeable lithium battery according to claim 1, it is characterised in that：The isolation film is poly- for polyethylene-polypropylene- Ethylene composite layer isolation film.

6. rechargeable lithium battery according to claim 1, it is characterised in that：The positive electricity pole and negative electricity pole and sealing Silica gel piece is equipped between lid.

7. rechargeable lithium battery according to claim 1, it is characterised in that：The electrolyte is made of hexafluorophosphate.

8. rechargeable lithium battery according to claim 1, it is characterised in that：The negative pole currect collecting body section is concave-convex ties Structure.