CN107768555A - Lithium battery encapsulation housing and lithium battery - Google Patents

Abstract

The invention relates to a lithium battery packaging casing, which includes a cylinder body, a negative electrode cap installed on the cylinder body, a positive electrode cap, a connector and a positive electrode current collector, and the cylinder body includes a first end and a second end , the first end is threaded with the negative cap, and the second end is threaded with the positive cap; the connector is housed in the barrel and abuts against the positive cap; The connecting piece includes a first connecting portion and a second connecting portion, and the inner wall of the lower end of the second connecting portion and the inner wall of the upper end of the first connecting portion form a continuous annular stepped groove for accommodating the positive electrode current collector. The above-mentioned lithium battery packaging shell is threadedly connected to the negative electrode cap and the positive electrode cap through the cylinder body, and the cylinder body and the battery cell can be disassembled and assembled, which avoids the customization of equipment for battery production and processing in the laboratory stage, and greatly simplifies the research and development process. technology, shortening the R&D cycle and reducing the cost of purchasing and customizing equipment.

Description

Lithium battery packaging case and lithium battery

technical field

The invention relates to the field of batteries, in particular to a lithium battery packaging casing and a lithium battery used for laboratory research and development.

Background technique

With the development of science and technology, the energy crisis has become increasingly prominent. Lithium batteries are a new type of energy storage energy. As a new type of green and environmentally friendly energy storage components, they have the advantages of environmental protection, high energy density, long service life, and wide application. , It is widely used in emerging fields such as electronic technology, electric vehicle energy storage, automobile starting, military industry, and aerospace.

At present, the current structural design of cylindrical lithium batteries is mostly the structure of 18650 and 26650 lithium batteries, and its manufacturing process is roughly divided into production, assembly, formation, and packaging. The equipment required in the assembly workshop is winding machine, shelling machine, grooving machine, liquid injection machine, laser welding machine, and sealing machine. A production line equipment manufactures lithium batteries of fixed size. If it is necessary to produce lithium batteries of different sizes, it is necessary to re-customize the production equipment and re-establish the management system. Therefore, changes in the structure and size of lithium batteries will lead to adjustments to production line molds. For example, the cost of technical transformation of equipment in slitting, winding, assembly, and formation, as well as the investment in new equipment will increase costs. If it is in the laboratory research stage, making lithium batteries according to market-oriented standards will undoubtedly increase the cost of research and development and the uncertainty of expenses.

Contents of the invention

Based on this, it is necessary to address the problems existing in the current traditional technology and provide a lithium battery packaging case for laboratory research and development. Dadi simplifies the R&D process, shortens the R&D cycle and reduces the cost of purchasing and customizing equipment.

The invention also provides a lithium battery using the packaging case.

In order to realize the purpose of the present invention, the present invention adopts following technical scheme:

A lithium battery packaging casing, including a cylinder, a negative cap installed on the cylinder, a positive cap, a connector, and a positive current collector, the cylinder includes a first end and a second end, the The first end is threaded with the negative cap, and the second end is threaded with the positive cap; the connector is housed in the barrel and abuts against the positive cap; the connector It includes a first connecting portion and a second connecting portion, the inner wall of the lower end of the second connecting portion and the inner wall of the upper end of the first connecting portion form a continuous annular stepped groove for accommodating the positive current collector.

The above-mentioned lithium battery packaging case is threadedly connected to the negative electrode cap and the positive electrode cap through the cylinder body, and the cylinder body and the battery cell can be assembled in a disassembled manner, which avoids the customization of equipment for battery production and processing in the laboratory stage, and greatly simplifies the research and development process. technology, shortening the R&D cycle and reducing the cost of purchasing and customizing equipment.

In one embodiment, a positive electrode assembly, a safety piece and a liquid injection port plug are installed on the top of the positive electrode cap.

In one embodiment, the positive electrode assembly includes a positive pole, a first insulating gasket, a second insulating gasket, a fixing nut and a nut washer, and the positive pole is passed through the first insulating gasket, the positive pole The cap, the second insulating gasket, and the nut gasket are connected to the fixing nut, and the bottom of the positive pole is used to abut against the positive current collector.

In one of the embodiments, a first groove is formed at an end of the safety member away from the positive electrode cap, a second groove is formed at an end of the safety member close to the positive electrode cap, and the first groove is The groove is arranged in a strip shape, and the second groove is arranged in a tapered shape.

In one embodiment, the positive pole cap is provided with a negative pole, and the negative pole and the positive pole cap are integrally processed from metal materials.

In one embodiment, a positive electrode installation groove is provided in the positive electrode cap, and a positive electrode sealing ring is installed in the positive electrode installation groove for abutting against the second end.

In one embodiment, a negative electrode installation groove is provided in the negative electrode cap, and a negative electrode sealing ring is installed in the negative electrode installation groove for abutting against the first end.

In one embodiment, the positive current collector includes a body portion and an abutment portion extending from the body portion away from the connecting piece, and the body portion is provided with a plurality of diversion grooves and welding holes, Each of the diversion grooves is arranged in a circular shape along the center of the body part; each of the welding holes is evenly distributed; The central column is arranged in a ring.

A lithium battery, comprising a packaging case and an electric core accommodated in the packaging case, the packaging case includes a cylinder, a negative electrode cap installed on the cylinder, a positive electrode cap, a connector and a positive current collector , the cylinder includes a first end and a second end, the first end is threaded with the negative cap, and the second end is threaded with the positive cap; the connector accommodates inside the barrel and abut against the positive cap; the connector includes a first connecting portion and a second connecting portion, the inner wall of the lower end of the second connecting portion and the inner wall of the upper end of the first connecting portion A continuous annular stepped groove is formed to accommodate the positive electrode collector; the battery core is wound from a positive electrode sheet, a negative electrode sheet and a foil, the positive electrode sheet is used to connect with the positive electrode collector, and the negative electrode The sheet is used to connect with the negative electrode cap, and the foil covers the outside of the positive electrode sheet and the negative electrode sheet.

In one embodiment, the positive current collector includes a body portion and an abutment portion extending from the body portion away from the connecting piece, and the body portion is provided with a plurality of diversion grooves and welding holes, Each of the diversion grooves is arranged in a ring shape along the center of the body portion; each of the welding holes is evenly distributed, and the abutting portion is used for abutting against the positive electrode sheet.

Description of drawings

Fig. 1 is the three-dimensional schematic view of the lithium battery of a preferred embodiment of the present invention;

Fig. 2 is an exploded view of the lithium battery shown in Fig. 1;

Fig. 3 is a sectional view at the A-A place shown in Fig. 1;

Figure 4 is an enlarged view of the B place shown in Figure 3;

Fig. 5 is an enlarged view at C shown in Fig. 3;

FIG. 6 is a bottom view of the positive current collector shown in FIG. 2 .

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Please refer to FIG. 1 to FIG. 6, which is a lithium battery 100 of a preferred embodiment of the present invention, which is used for laboratory research and development. The lithium battery 100 includes a packaging case 10 and a cell 90 housed in the packaging case 10. The packaging case 10 includes a cylinder body 30 , a negative electrode cap 40 installed on the cylinder body 30 , a positive electrode cap 50 , a connector 60 and a positive electrode current collector 70 .

The cylinder body 30 is substantially cylindrical, and the cylinder body 30 has an accommodating cavity for accommodating the electric core 90 . The barrel 30 includes a first end 31 and a second end 32. The first end 31 is screwed to the negative electrode cap 40, and the second end 32 is threaded to the positive electrode cap 50, which avoids the trouble of battery manufacturing and processing in the laboratory stage. The customization of equipment reduces the investment in equipment, such as welding machines, roll groove sealing machines and other equipment, thereby greatly simplifying the process flow and research and development costs, and the cylinder body 30 can be used multiple times. Optionally, both the first end 31 and the second end 32 of the barrel 30 are coated with conductive paste, so as to enhance the conductivity of the connection between the barrel 30 and the cap. In another embodiment, the barrel 30 is made of metal material. Specifically, the metal material is aluminum material.

The negative electrode cap 40 is roughly arranged in a ring shape, and it is processed by metal foil, such as copper foil or aluminum foil, and is used as the negative electrode current collector of the lithium battery 100. Specifically, the negative electrode cap 40 is provided with a negative electrode mounting groove (Fig. Not marked), the negative electrode installation groove is used to position the first end 31 of the cylinder 30, avoiding deformation of the cylinder 30 during installation. In another embodiment, a negative electrode sealing ring 41 is installed in the negative electrode installation groove, and the negative electrode sealing ring 41 is used to abut against the first end 31 of the barrel 30 to prevent the barrel 30 from over-pressing the negative electrode cap 40 .

Please refer to FIG. 2 again, the connecting piece 60 is generally arranged in a ring shape, which is accommodated in the accommodating cavity of the cylinder body 30 and abuts against the positive electrode cap 50. Specifically, the connecting piece 60 includes a first connecting portion 61 and a second connecting portion 61. Connecting part 62 , the outer diameter of the first connecting part 61 is equal to the inner diameter of the barrel 30 , and the inner wall of the lower end of the second connecting part 62 and the inner wall of the upper end of the first connecting part 61 form a continuous annular stepped groove. In another embodiment, the connecting member 60 is made of insulating material, which may be rubber or plastic.

Please refer to FIG. 6 again, the positive current collector 70 is accommodated in the annular stepped groove of the connector 60, and abuts against the battery core 90, so that the positive current collector 70 is isolated from the cylinder 30 and the positive cap 50. Specifically, the positive The current collector 70 is arranged in a roughly circular shape. The positive current collector 70 includes a body portion 71 and an abutment portion 72 extending from the end of the body portion 71 away from the connector. The body portion 71 is provided with a number of diversion grooves 711 and welding holes. 712 , each diversion groove 711 is arranged in a ring shape along the center of the body part 71 , so as to facilitate the flow of the electrolyte solution evenly during liquid injection and improve the quality of electrolyte solution injection. The welding holes 712 are evenly distributed, so as to facilitate the connection of the positive current collector 70 and the battery cell 90 by soldering during assembly. In another embodiment, the shape of the welding hole 712 may be circular, square, triangular, or arc-shaped.

In one embodiment, the welding hole 712 is circular in shape. The abutting portion 72 is in contact with the battery cell 90 so that the battery cell 90 is better compacted during assembly, and the positive current collector 70 is in closer contact with the battery cell 90 . Optionally, the abutting portion 72 includes a central column 721 and a plurality of ribs 722 connected to the central column 721 , and each rib 722 is circularly arranged around the central column 721 . In another embodiment, the positive electrode collector 70 is processed by metal materials. Specifically, the metal material is aluminum or copper.

Please refer to FIG. 2 and FIG. 5 again, the positive electrode cap 50 is arranged in a substantially circular shape, and the positive electrode cap 50 is provided with a positive electrode mounting groove (not marked in the figure), and the positive electrode mounting groove is used to align the second end portion 32 of the cylinder body 30 to locate. In another embodiment, a positive electrode sealing ring 51 is installed in the positive electrode installation groove, and the positive electrode sealing ring 51 is used to abut against the second end portion 32 of the barrel 30 . The positive pole cap 50 is provided with a negative pole 52, and the negative pole 52 and the positive pole cap 50 are integrally processed from metal materials, that is, the barrel 30, the positive pole cap 50, and the negative pole cap 40 are a connected body as the negative pole of the lithium battery 100. Optionally, the metal material is copper or aluminum. A positive electrode assembly 53 , a safety piece 54 and a liquid injection port plug 55 are mounted on the top of the positive electrode cap 50 .

The positive electrode assembly 53 is the positive electrode of the lithium battery 100 , and the positive electrode assembly 53 includes a positive pole 531 , a first insulating washer 532 , a second insulating washer 533 , a fixing nut 534 and a nut washer 535 . During installation, the positive pole 531 passes through the first insulating gasket 532, the positive electrode cap 50, the second insulating gasket 533, and the nut gasket 535 in sequence, and is connected with the fixing nut 534, and the bottom of the positive pole 531 is in contact with the positive current collector 70. , so that the positive pole 531 is fixed on the positive cap 50, avoiding the short circuit caused by the direct contact between the positive pole 531 and the positive cover plate, it can also facilitate the test of the battery in the later stage, and provide convenience for the wiring of the energy storage device in the later stage. In another embodiment, both the first insulating spacer 532 and the second insulating spacer 533 are made of PP material.

Please refer to Fig. 4 again, safety member 54 guarantees the safety of whole set of equipment when being used for experiment, and this safety member 54 is provided with first groove 541 away from an end portion of described positive electrode cap, and safety member 54 is close to an end portion of described positive electrode cap cap There is a second groove 542, when the pressure of the medium in the battery rises beyond the specified value, the medium breaks through the second groove 542, making the second groove 542 communicate with the first groove 541, thus ensuring the safety of the cylinder 30 . Viewed from the outside or viewed from the cross section, the first groove 541 is arranged in a strip shape, and the second groove 542 is arranged in a tapered shape. In another embodiment, the safety element 54 is an explosion-proof valve. Optionally, the safety element 54 may also be a one-way exhaust valve or an explosion-proof membrane. There are two liquid injection port plugs 55 , and each liquid injection port plug 55 is located on both sides of the positive electrode assembly 53 , and is used to block the liquid injection port of the positive electrode cap 50 to avoid electrolyte leakage. In another embodiment, a gasket (not shown) is sleeved on the safety member 54 and the plug 55 of the liquid injection port.

The battery core 90 is formed by winding a positive electrode sheet 91, negative electrode sheets 92 and 93, and a foil material 93 covers the outside of the positive electrode sheet 91 and the negative electrode sheet 92, and the positive electrode sheet 91 is connected to the body part 71 of the positive electrode current collector 70 and is connected to the positive electrode sheet 91. The abutting portion 72 abuts, and the negative electrode sheet 92 is connected to the negative electrode cap 40, so that the positive electrode sheet 91 and the negative electrode sheet 92 are all exposed to a section of foil material 93 at one end, and the positive electrode sheet 91 and the negative electrode sheet 92 can be used as tabs. Soldering the tabs separately saves the process of tab welding and greatly improves the efficiency of research and development.

In another embodiment, the size of the lithium battery 100 is 200*250mm, that is, the bottom diameter is 200mm, and the height is 250mm.

During installation, the battery cell 90 is first installed in the housing chamber of the cylinder 30, and then the negative electrode cap 40 with the negative electrode sealing ring 41 is installed on the first end 31 of the cylinder 30, so as to ensure that the negative electrode cap 40 is in contact with the cylinder body 30. The cylinder body 30 is tightly connected, the positive current collector 70 sleeved with the connector 60 is abutted against the positive electrode sheet 91 of the cell 90, and the positive electrode current collector 70 is connected to the positive electrode sheet 91 by soldering to avoid incorrect welding positions. Then the positive electrode cap 50 with the positive electrode sealing ring 51 is installed on the second end 32 of the cylinder body 30, the liquid injection port plug 55 is opened, the electrolyte solution is poured into the cylinder body 30, and the liquid injection port plug is covered again. Head 55 , complete the assembly of the lithium battery 100 .

The above-mentioned lithium battery 100 packaging case 10 is threadedly connected to the negative electrode cap 40 and the positive electrode cap 50 through the cylinder body 30, and the cylinder body 30 and the battery cell 90 can be disassembled and assembled, which avoids the customization of the equipment for battery production and processing in the laboratory stage. , which greatly simplifies the R&D process, shortens the R&D cycle and reduces the cost of purchasing and customizing equipment.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A lithium battery packaging case, characterized in that it includes a cylinder, a negative cap installed on the cylinder, a positive cap, a connector and a positive current collector, and the cylinder includes a first end and a second end. Two ends, the first end is threaded with the negative cap, the second end is threaded with the positive cap; the connector is accommodated in the barrel and abuts against the positive cap connected; the connector includes a first connecting part and a second connecting part, the inner wall of the lower end of the second connecting part and the inner wall of the upper end of the first connecting part form a continuous annular stepped groove to accommodate the positive electrode current collector. 2 . The lithium battery packaging case according to claim 1 , wherein a positive electrode assembly, a safety piece and a plug for a liquid injection port are installed on the top of the positive electrode cap. 3 . 3. The lithium battery packaging case according to claim 2, wherein the positive electrode assembly comprises a positive pole, a first insulating gasket, a second insulating gasket, a fixing nut and a nut washer, and the positive pole The first insulating gasket, the positive electrode cap, the second insulating gasket, and the nut gasket are sequentially passed through and connected with the fixing nut, and the bottom of the positive pole column is used to abut against the positive electrode current collector. 4. The lithium battery packaging case according to claim 2, wherein a first groove is formed at an end of the safety member away from the positive cap, and an end of the safety member close to the positive cap A second groove is provided, the first groove is arranged in a strip shape, and the second groove is arranged in a tapered shape. 5 . The lithium battery package case according to claim 2 , wherein a negative post is provided on the positive cap, and the negative post and the positive cap are integrally processed from metal materials. 6 . 6. The lithium battery packaging case according to claim 1 or 5, wherein a positive electrode installation groove is provided in the positive electrode cap, and a positive electrode sealing ring is installed in the positive electrode installation groove for connecting with the second electrode. The two ends are butted. 7. The lithium battery packaging case according to claim 1, wherein a negative electrode installation groove is provided in the negative electrode cap, and a negative electrode sealing ring is installed in the negative electrode installation groove for connecting with the first end. Ministry butt. 8. The lithium battery packaging case according to claim 1, wherein the positive current collector comprises a body portion and an abutment portion extending from the body portion away from the end of the connector, the body portion There are a number of diversion grooves and welding holes, each of the diversion grooves is arranged in a ring along the center of the body; each of the welding holes is evenly distributed; the abutting portion includes a central column and a connecting A plurality of ribs of the central column, each of the ribs is arranged in a ring around the central column. 9. A lithium battery, characterized in that it comprises a package case and an electric core housed in the package case, the package case includes a cylinder, a negative electrode cap installed on the cylinder, a positive electrode cap, A connector and a positive current collector, the barrel includes a first end and a second end, the first end is threaded to the negative cap, and the second end is threaded to the positive cap; The connecting piece is housed in the cylinder and abuts against the positive electrode cap; the connecting piece includes a first connecting portion and a second connecting portion, and the inner wall of the lower end of the second connecting portion is in contact with the first connecting portion. The inner wall of the upper end of the connection part forms a continuous annular stepped groove to accommodate the positive electrode collector; Fluid connection, the negative electrode sheet is used to connect with the negative electrode cap, and the foil covers the outside of the positive electrode sheet and the negative electrode sheet. 10. The lithium battery according to claim 9, wherein the positive electrode current collector comprises a body portion and an abutting portion extending from the body portion away from the end of the connector, and the body portion is provided with a A plurality of diversion grooves and welding holes, each of the diversion grooves is arranged in a ring along the center of the body portion; each of the welding holes is evenly distributed, and the abutting portion is used to abut against the positive electrode sheet .