CN214378767U

CN214378767U - Cylindrical battery

Info

Publication number: CN214378767U
Application number: CN202120380698.XU
Authority: CN
Inventors: 邹鹏; 戴贤; 蒋世用; 董锋; 黄玉元; 陈智鹏; 王毅
Original assignee: Chengdu Yinlong New Energy Co ltd; Yinlong New Energy Co Ltd
Current assignee: Chengdu Yinlong New Energy Co ltd; Yinlong New Energy Co Ltd
Priority date: 2021-02-20
Filing date: 2021-02-20
Publication date: 2021-10-08
Anticipated expiration: 2031-02-20

Abstract

The utility model provides a cylindrical battery, which comprises a cylinder body, a central tube, a winding cell, an anode cover plate and a cathode collector plate, wherein the central tube is arranged in the cylinder body; the winding cell is wound on the central tube; the positive cover plate comprises a main body and a positive limiting column arranged in the middle of the main body, the main body is connected with the barrel, at least one part of the positive limiting column penetrates through one end of the central tube, a liquid injection hole is formed in the positive limiting column, the liquid injection hole is communicated with a cavity in the central tube, and the liquid injection hole and the barrel are coaxially arranged; the negative current collecting disc is arranged in the barrel and comprises a disc body and a negative limiting column arranged in the middle of the disc body, and at least one part of the negative limiting column is arranged in the other end of the central tube in a penetrating mode. By adopting the scheme, the position of the liquid injection hole can be quickly positioned, so that the liquid injection and sealing efficiency is improved; in addition, the positive cover plate and the negative current collecting plate can be accurately positioned, so that the assembly efficiency is improved, and the assembly quality and the structural reliability are ensured.

Description

Cylindrical battery

Technical Field

The utility model relates to a battery technology field particularly, relates to a cylinder battery.

Background

The liquid injection hole of the existing cylindrical battery is offset, and is not easy to position when electrolyte is injected and the liquid injection hole is sealed, so that the efficiency of liquid injection and sealing operation is influenced. Moreover, some structures in the cylindrical battery are not easy to be accurately positioned during assembly, and the assembly efficiency and the structural reliability are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cylindrical battery to improve the production efficiency and the structural reliability of current cylindrical battery.

In order to achieve the above object, the present invention provides a cylindrical battery, including: a barrel; a central tube disposed within the barrel; the winding battery cell is wound on the central tube; the positive pole cover plate comprises a main body and a positive pole limiting column arranged in the middle of the main body, the main body is connected with the barrel, at least one part of the positive pole limiting column is arranged in one end of the central tube in a penetrating mode, a liquid injection hole is formed in the positive pole limiting column, the liquid injection hole is communicated with a cavity in the central tube, and the liquid injection hole and the barrel are coaxially arranged; the negative current collecting disc is arranged in the barrel and comprises a disc body and a negative limiting column arranged in the middle of the disc body, and at least one part of the negative limiting column penetrates through the other end of the central tube.

Further, the disk body with the one end butt of coiling electricity core, liquid separation hole has on the disk body, through-hole has in the spacing post of negative pole, liquid separation hole passes through the through-hole with cavity intercommunication in the center tube to the outer wall of center tube with the regional electrolyte of pouring into between the inner wall of barrel.

Further, the cylindrical battery further comprises a negative electrode cover plate, the negative electrode cover plate is connected with one end of the cylinder in a sealing mode, a liquid distribution cavity is formed between the negative electrode cover plate and the negative electrode current collecting disc, and the liquid distribution hole is communicated with the through hole through the liquid distribution cavity.

Furthermore, divide the liquid hole to be a plurality of, a plurality of divide the liquid hole to distribute in the different positions of disk body.

Furthermore, a groove is formed in the tray body, an opening of the groove faces the winding battery core, the length direction of the groove is arranged along the radial direction of the tray body, a plurality of liquid distribution holes are formed in the groove, and the liquid distribution holes in the groove are arranged at intervals along the length direction of the groove; the recess is a plurality of, and is a plurality of the recess encircles the spacing post of negative pole sets up.

Furthermore, an exhaust groove is formed in the positive limiting column and communicated with the cavity in the central tube, and a part of the exhaust groove is positioned outside the central tube.

Further, the cylindrical battery further includes: the positive pole current collector disc is located the coiling electricity core with between the positive apron, the hole of dodging has on the positive pole current collector disc, anodal spacing post passes the hole of dodging, the positive pole current collector disc with exhaust gap has between the positive apron, wherein, the air discharge duct dodge the hole with exhaust gap communicates in proper order.

Further, the cylindrical battery further includes: and the positive current collecting disc is arranged in the barrel and is abutted to the winding battery cell.

Further, anodal current collecting disc has anodal spacing groove, the main part includes first plate body and sets up first boss on the first plate body, first plate body with the barrel is connected, the lateral wall of first boss with the inner wall cooperation in anodal spacing groove.

Further, negative pole current collecting disc has the negative pole spacing groove, the cylinder battery still includes the negative pole apron, the negative pole apron includes the second plate body and sets up second boss on the second plate body, the second plate body with the barrel is connected, the lateral wall of second boss with the inner wall cooperation of negative pole spacing groove.

The technical scheme of the utility model is applied, a cylindrical battery is provided, the cylindrical battery comprises a cylinder body, a central tube, a winding battery cell, an anode cover plate and a cathode current collecting disc, and the central tube is arranged in the cylinder body; the winding cell is wound on the central tube; the positive cover plate comprises a main body and a positive limiting column arranged in the middle of the main body, the main body is connected with the barrel, at least one part of the positive limiting column penetrates through one end of the central tube, a liquid injection hole is formed in the positive limiting column, the liquid injection hole is communicated with a cavity in the central tube, and the liquid injection hole and the barrel are coaxially arranged; the negative current collecting disc is arranged in the barrel and comprises a disc body and a negative limiting column arranged in the middle of the disc body, and at least one part of the negative limiting column is arranged in the other end of the central tube in a penetrating mode. By adopting the scheme, the electrolyte can be injected into the barrel through the liquid injection hole on the positive limiting column, and the liquid injection equipment can quickly position the position of the liquid injection hole due to the coaxial arrangement of the liquid injection hole and the barrel, so that the liquid injection and sealing efficiency is improved; and the positive limiting column and the negative limiting column penetrate into the central tube, so that the positive cover plate and the negative current collecting disc can be accurately positioned, the assembly efficiency is improved, and the assembly quality and the structural reliability are ensured.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a cylindrical battery provided by an embodiment of the present invention;

fig. 2 shows a schematic structural view of the positive electrode cap plate of fig. 1;

fig. 3 shows a schematic view of the structure of an anode current collecting disk in fig. 1;

fig. 4 shows another view of the anode current collecting disk of fig. 3.

Wherein the figures include the following reference numerals:

10. a barrel; 11. a liquid separation cavity; 12. an exhaust gap; 20. a central tube; 30. winding the battery cell; 40. a positive electrode cover plate; 41. a main body; 411. a first plate body; 412. a first boss; 42. a positive electrode limit post; 421. a liquid injection hole; 422. an exhaust groove; 50. a negative current collecting plate; 51. a tray body; 511. a liquid separation hole; 512. a groove; 52. a negative electrode limit post; 521. a through hole; 60. a negative electrode cover plate; 61. a second plate body; 62. a second boss; 70. a positive current collector; 71. avoiding the hole.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 4, an embodiment of the present invention provides a cylindrical battery, including: a cylinder 10; a central tube 20 disposed within the barrel 10; a winding core 30 wound on the central tube 20; the positive electrode cover plate 40, the positive electrode cover plate 40 includes the body 41 and sets up in the positive electrode spacing post 42 of the body 41 middle part, the body 41 connects with cylinder 10, at least a part of the positive electrode spacing post 42 is worn to set up in one end of the central tube 20, there are liquid injection holes 421 in the positive electrode spacing post 42, the liquid injection hole 421 communicates with cavity in the central tube 20, the liquid injection hole 421 and cylinder 10 are coaxial to set up; the negative current collecting disc 50 is arranged in the cylinder 10, the negative current collecting disc 50 comprises a disc body 51 and a negative limiting column 52 arranged in the middle of the disc body 51, and at least one part of the negative limiting column 52 penetrates through the other end of the central tube 20.

By adopting the scheme, the electrolyte can be injected into the barrel 10 through the injection hole 421 on the positive electrode limiting column 42, and the injection equipment can quickly position the injection hole 421 due to the coaxial arrangement of the injection hole 421 and the barrel 10, so that the injection and sealing efficiency is improved; moreover, the positive limiting column 42 and the negative limiting column 52 penetrate into the central tube 20, so that the positive cover plate 40 and the negative current collecting disc 50 can be accurately positioned, the assembly efficiency of the cylindrical battery is improved, and the assembly quality and the structural reliability are ensured.

In the present embodiment, the disc body 51 abuts against one end of the winding battery cell 30, the disc body 51 has a liquid separation hole 511, the negative electrode limiting column 52 has a through hole 521 therein, and the liquid separation hole 511 communicates with the cavity in the central tube 20 through the through hole 521, so as to inject the electrolyte into the region between the outer wall of the central tube 20 and the inner wall of the cylindrical body 10. The electrolyte entering the central tube 20 enters the dispensing holes 511 through the through holes 521, and then infiltrates the winding core 30 through the dispensing holes 511. In operation, the cylindrical battery is vertically placed, and the positive cover plate 40 is located above the negative current collecting plate 50, so that the electrolyte firstly flows from top to bottom through the central tube 20, and then soaks the winding battery core 30 from bottom to top through the liquid separating holes 511, which is beneficial to discharging the air in the barrel 10.

In this embodiment, the cylindrical battery further includes a negative cover plate 60, the negative cover plate 60 is hermetically connected to one end of the cylinder 10, a liquid distribution chamber 11 is provided between the negative cover plate 60 and the negative current collecting plate 50, and the liquid distribution holes 511 are communicated with the through holes 521 through the liquid distribution chamber 11. The negative electrode cover plate 60 plays a role in protecting the winding battery cell 30 and other structures. The dispersion of the electrolyte is facilitated by the liquid distribution chamber 11.

In this embodiment, the liquid distribution holes 511 are plural, and the plural liquid distribution holes 511 are distributed at different positions of the tray body 51. This facilitates even distribution of the electrolyte.

Further, the disc body 51 is provided with a groove 512, an opening of the groove 512 faces the winding battery core 30, the length direction of the groove 512 is arranged along the radial direction of the disc body 51, the groove 512 is internally provided with a plurality of liquid distribution holes 511, and the plurality of liquid distribution holes 511 in the groove 512 are arranged at intervals along the length direction of the groove 512; the plurality of grooves 512 are disposed around the negative electrode spacing column 52. This may result in a more uniform distribution of the electrolyte.

In this embodiment, the positive electrode positioning post 42 has an air discharge groove 422 therein, the air discharge groove 422 is communicated with the cavity inside the central tube 20, and a part of the air discharge groove 422 is located outside the central tube 20. Thus, the gas in the cylinder 10 can be discharged through the gas discharge groove 422. Moreover, the structure setting in this scheme for anodal spacing post 42 has limit function, injects electrolyte function and exhaust function, need not to design the structure alone to every function, is about to different functions combine in anodal spacing post 42, has consequently simplified the structure of cylinder battery, the cost is reduced.

In this embodiment, the cylindrical battery further includes: the positive electrode current collecting disc 70 is positioned between the winding battery core 30 and the positive electrode cover plate 40, the positive electrode current collecting disc 70 is provided with an avoidance hole 71, the positive electrode limiting column 42 penetrates through the avoidance hole 71, an exhaust gap 12 is formed between the positive electrode current collecting disc 70 and the positive electrode cover plate 40, and the exhaust groove 422, the avoidance hole 71 and the exhaust gap 12 are sequentially communicated.

In this embodiment, the cylindrical battery further includes: the positive current collecting plate 70 is provided in the cylindrical body 10, and the positive current collecting plate 70 abuts against the winding cell 30. Specifically, the positive collecting plate 70 has a positive limiting groove, the main body 41 includes a first plate 411 and a first boss 412 disposed on the first plate 411, the first plate 411 is connected to the barrel 10, and a side wall of the first boss 412 is engaged with an inner wall of the positive limiting groove. This can achieve accurate positioning of the positive current collecting plate 70 and the main body 41.

In this embodiment, the negative current collecting plate 50 has a negative limiting groove, the cylindrical battery further includes a negative cover plate 60, the negative cover plate 60 includes a second plate body 61 and a second boss 62 disposed on the second plate body 61, the second plate body 61 is connected to the cylindrical body 10, and a side wall of the second boss 62 is engaged with an inner wall of the negative limiting groove. This allows precise positioning of anode current collecting disk 50 and anode cover plate 60.

Specifically, the cylindrical battery is a full-lug lithium iron phosphate cylindrical battery or a lithium titanate and ternary lithium battery. The scheme has the following characteristics:

1. a battery cell limiting column with a through hole is arranged in the center of the positive cover plate; the limiting column battery cell side is provided with a groove which is communicated with the limiting column through hole; the liquid injection hole in the center of the battery core can quickly position during liquid injection and sealing, and the automatic production is conveniently realized; the limiting column penetrates through the positive current collecting disc and then is inserted into the central tube, and the central tube at the positive side and the winding core can be fixed; liquid flows into the central tube through the limiting column through hole of the anode cover plate, then flows to the anode cover plate from the central tube through the limiting column through hole on the anode current collecting disc, and is infiltrated from the anode side to the anode side through the small hole on the anode current collecting disc, so that the liquid can be infiltrated from bottom to top by fully utilizing the liquid injection pressure, and the rapid infiltration of electrolyte and the acceleration of exhaust are facilitated; the groove of the central tube is exposed at the upper part of the positive limit column, so that the vacuum pumping during liquid injection is facilitated.

2. The center of the negative current collecting disc is provided with an injection-molded PP material battery cell limiting column with a through hole at the center, and the PP material battery cell limiting column is inserted into the central tube during assembly, so that the position of the current collecting disc can be effectively fixed, and the situation that a negative current collecting disc cannot enter a shell due to welding deviation is avoided; liquid flows into the central tube through the limiting column through hole of the anode cover plate, then flows into the bottom of the negative side of the winding core through the limiting column through hole on the negative current collecting disc by the central tube, and is infiltrated from the negative side to the positive side through the small hole on the negative current collecting disc, so that the liquid can be infiltrated from bottom to top by fully utilizing the liquid injection pressure, and the electrolyte can be infiltrated rapidly and the exhaust can be accelerated; during assembly, the PP material battery core limiting column is inserted into the central tube, the negative electrode current collecting disc is welded with the roll core, and then the negative electrode current collecting disc is welded with the negative electrode cover plate, so that the negative electrode side central tube and the roll core can be fixed.

3. The negative electrode cell limiting column, the positive electrode cell limiting column and the central tube are matched for use to form rigid connection, so that asynchronous jumping of a winding core and a shell under a vibration condition is limited, and a lug and a current collecting disc are prevented from easily falling off under the vibration condition.

The assembly process of the cylindrical battery comprises the following steps: the positive and negative pole pieces and the diaphragm center tube are wound to form a roll core negative pole limiting column inserted into the center tube (the position of the negative pole current collecting disc is prevented from shifting), a negative pole current collecting disc, a roll core negative pole welding positive pole current collecting disc, a roll core positive pole welding negative pole current collecting disc, a negative pole cover plate, a positive pole current collecting disc, an aluminum shell welding positive pole limiting column, a positive pole current collecting disc inserted into the center tube (the rigid fixing positive pole side roll core), a positive pole cover plate, an aluminum shell negative pole cover plate and an aluminum shell are welded.

During liquid injection, the anti-vibration full-lug lithium iron phosphate cylindrical battery is placed on a liquid injection tool manually or by a manipulator, and the liquid injection nozzle after debugging is directly pressed down to realize liquid injection (the traditional cylindrical battery needs to rotate to align the liquid injection hole and the liquid injection nozzle);

during liquid injection, electrolyte enters from a through hole in the positive electrode cover plate limiting column, passes through holes in the central tube and the negative electrode limiting column and reaches the negative electrode cover plate, the winding core is soaked from bottom to top from a small hole in the negative electrode current collecting disc by fully utilizing liquid injection pressure, most of residual gas in the winding core is rapidly discharged, rapid soaking is realized, and the central tube is exposed out of the groove of the positive electrode core limiting column, so that rapid vacuumizing is facilitated (traditional cylindrical batteries are soaked from top to bottom or are soaked simultaneously from top to bottom, and the gas discharge resistance is large);

the positive electrode cell limiting column and the negative electrode cell limiting column limit the winding core, so that the axial up-and-down jumping of the winding core is avoided, and the synchronous jumping of the whole structure is realized, so that the phenomenon that a tab and a current collecting disc are easy to fall off under a vibration condition is prevented (the axial up-and-down jumping of the winding core of a traditional cylindrical battery under the vibration condition can cause the falling of the winding core and the current collecting disc for a long time);

during sealing, the anti-vibration full-lug lithium iron phosphate cylindrical battery is placed on a sealing tool by manpower or a mechanical arm, and the steel ball is directly pressed into the liquid injection hole by an automatic mechanism (the liquid injection hole and the steel ball pressing mechanism need to be aligned in a rotating mode or the steel ball is manually knocked into the traditional cylindrical battery).

The utility model discloses following technical problem that can solve: 1. the liquid cannot be quickly positioned during liquid injection and sealing; 2. the difficulty of battery liquid injection is high; 3. the tab and the current collecting disc are easy to fall off under the vibration condition; 4. the welding of the negative pole current collecting disc is deviated in the assembling process, and the winding core is difficult to enter the shell.

The scheme has the following beneficial effects: the structure of the central liquid injection hole is adopted, 1. the flow resistance is reduced, and compared with the traditional cylindrical battery liquid injection operation efficiency, the utility model improves more than 30 percent; 2. the sealing operation efficiency is improved by more than 50%. The structure of limiting the winding core is adopted, the dropping failure rate of the lug and the current collecting disc is reduced under the vibration condition, and the defective rate of the incoming shell is reduced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical battery, comprising:

a cylinder (10);

a central tube (20) disposed within the barrel (10);

a winding core (30) wound around the central tube (20);

the positive cover plate (40) comprises a main body (41) and a positive limiting column (42) arranged in the middle of the main body (41), the main body (41) is connected with the barrel body (10), at least one part of the positive limiting column (42) penetrates through one end of the central tube (20), a liquid injection hole (421) is formed in the positive limiting column (42), the liquid injection hole (421) is communicated with a cavity in the central tube (20), and the liquid injection hole (421) and the barrel body (10) are coaxially arranged;

the negative current collecting disc (50) is arranged in the cylinder body (10), the negative current collecting disc (50) comprises a disc body (51) and a negative limiting column (52) arranged in the middle of the disc body (51), and at least one part of the negative limiting column (52) penetrates through the other end of the central pipe (20).

2. The cylindrical battery according to claim 1, wherein the disc body (51) abuts against one end of the winding battery core (30), the disc body (51) is provided with a liquid separation hole (511), the negative limiting column (52) is internally provided with a through hole (521), and the liquid separation hole (511) is communicated with a cavity in the central tube (20) through the through hole (521) so as to inject electrolyte into an area between the outer wall of the central tube (20) and the inner wall of the cylinder body (10).

3. The cylindrical battery as claimed in claim 2 further comprises a negative cover plate (60), wherein the negative cover plate (60) is hermetically connected with one end of the cylinder (10), a liquid distribution chamber (11) is arranged between the negative cover plate (60) and the negative current collecting plate (50), and the liquid distribution hole (511) is communicated with the through hole (521) through the liquid distribution chamber (11).

4. The cylindrical battery according to claim 2, wherein the liquid distribution hole (511) is plural, and the plural liquid distribution holes (511) are distributed at different positions of the tray body (51).

5. The cylindrical battery as claimed in claim 4, wherein the tray body (51) is provided with a groove (512), the opening of the groove (512) faces the winding electric core (30), the length direction of the groove (512) is arranged along the radial direction of the tray body (51), the groove (512) is provided with a plurality of liquid distribution holes (511), and the liquid distribution holes (511) in the groove (512) are arranged at intervals along the length direction of the groove (512); the grooves (512) are multiple, and the grooves (512) are arranged around the negative limiting column (52).

6. The cylindrical battery according to claim 1 wherein the positive restraint post (42) has a vent groove (422) therein, the vent groove (422) communicating with a cavity in the center tube (20), a portion of the vent groove (422) being located outside the center tube (20).

7. The cylindrical battery according to claim 6, further comprising:

anodal current collector dish (70), anodal current collector dish (70) are located coiling electricity core (30) with between anodal apron (40), anodal current collector dish (70) are gone up and have dodge hole (71), anodal spacing post (42) are passed dodge hole (71), anodal current collector dish (70) with exhaust gap (12) have between anodal apron (40), wherein, exhaust duct (422) dodge hole (71) with exhaust gap (12) communicate in proper order.

8. The cylindrical battery according to claim 1, further comprising:

and the positive current collecting plate (70) is arranged in the barrel (10), and the positive current collecting plate (70) is abutted to the winding battery cell (30).

9. The cylindrical battery according to claim 8, wherein the positive current collecting plate (70) has a positive limiting groove, the main body (41) comprises a first plate body (411) and a first boss (412) arranged on the first plate body (411), the first plate body (411) is connected with the cylinder (10), and the side wall of the first boss (412) is matched with the inner wall of the positive limiting groove.

10. The cylindrical battery according to claim 1, wherein the anode current collecting plate (50) has an anode limiting groove, the cylindrical battery further comprises an anode cover plate (60), the anode cover plate (60) comprises a second plate body (61) and a second boss (62) arranged on the second plate body (61), the second plate body (61) is connected with the cylinder (10), and the side wall of the second boss (62) is matched with the inner wall of the anode limiting groove.