CN102694197B

CN102694197B - Ring-type lithium ion battery

Info

Publication number: CN102694197B
Application number: CN201110068156.XA
Authority: CN
Inventors: 覃毅; 蔡惠群; 魏银仓
Original assignee: ZHUHAI YINLONG NEW ENERGY Co Ltd
Current assignee: Gree Altairnano New Energy Inc
Priority date: 2011-03-21
Filing date: 2011-03-21
Publication date: 2015-02-11
Anticipated expiration: 2031-03-21
Also published as: CN102694197A

Abstract

The invention provides a ring-type lithium ion battery, which has an improved structure, high safety, good heat dissipation and long service life. The present invention is achieved through the following technical solutions: a ring-shaped lithium ion battery, including: a cylindrical shell structure, a cylindrical inner shell nested in the inner cavity of the shell, and an electric battery between the shell and the inner shell. The core and the electrodes located at both ends of the battery core; the battery core includes a plurality of positive electrode sheets, separators and negative electrode sheets arranged and connected in a winding manner, and the separator is spaced between adjacent positive electrode sheets and negative electrode sheets; wherein, the The electrode includes: a pole plate, a pole and a pole ear; the pole ear is formed by winding the blank strip part protruding outward from the outer end of the positive pole piece or the negative pole piece of the battery, and the pole ear is connected with the positive pole piece or the negative pole piece The connection is integrated; the pole lug is directly connected with the pole plate, the plane of the pole plate is perpendicular to the cylindrical surface of the shell and the shell, the pole plate is fixedly connected with the inner shell or the shell by stamping, and the pole plate is provided with a pole.

Description

Annular lithium ion battery

Technical field

The invention belongs to lithium-ion-power cell technical field, particularly relate to a kind of annular lithium ion battery.

Background technology

Lithium ion battery is the rechargeable battery of new generation grown up after MH-Ni battery, the priority research areas that operating voltage is high, energy density is large because having, fail safe is good, lightweight, self discharge is little, have extended cycle life, memory-less effect, the advantage such as pollution-free become new energy development.

In prior art, lithium ion battery adopts square or circular solids structure, due to structure also imperfection, there is the shortcomings such as security performance is low, charge and discharge cycles number of times is few, serviceability is poor.Be specially: existing lithium ion battery, due under operating state, inside battery ion high-speed motion, internal temperature raises and cannot outwards discharge, thus causes battery case to be out of shape, inner pole piece is out of shape, spacing changes, and affects battery charging and discharging quality, finally causes battery performance unstable, explosive, the life-span is short.

Along with the fast development of electric motor car industry, the fail safe of electrokinetic cell receives to be paid close attention to widely.In prior art, Large Copacity, powerful electrokinetic cell are all through and carry out external series or in parallel and composition to single battery.Affect the reason of electrokinetic cell series connection group or also joint group fail safe mainly: the heat produced under forming the battery cell consistency difference each other of battery pack, operating state cannot be discharged in time, accumulate gradually, last thermal runaway produces the security incidents such as on fire from explosion, brings harm and loss to client.

Therefore, for lithium ion battery, need to improve from structure.

Summary of the invention

The object of the present invention is to provide a kind of annular lithium ion battery, improve structure, fail safe is high, good heat dissipation, life-span be long.

The present invention is achieved through the following technical solutions:

Annular lithium ion battery, includes: the shell of cylindrical surface structure, the inner casing of the cylindrical surface structure be nested in shell inner cavity, battery core between shell and inner casing and be positioned at the electrode at battery core two ends; Described battery core comprises multi-disc positive plate, barrier film and negative plate and adopts winding method arrangement to be connected, and barrier film is interval between adjacent positive plate, negative plate; Wherein, described electrode includes: pole plate, pole and lug; Described lug is that the outwardly blank tape winds portions in the outer end of the positive plate of battery core or negative plate is formed, and lug and positive plate or negative plate connect as one; Described lug is directly connected with pole plate, and pole plate plane orthogonal is in the face of cylinder of shell and shell, and pole plate is fixedly connected with by impact style with inner casing or shell, and pole plate is provided with pole.

Conductive adhesive layer is provided with between described lug and pole plate.

To sum up the invention has the beneficial effects as follows:

Annular lithium ion battery of the present invention, is made up of shell, inner casing, battery core, electrode, hollow structure, and electrode is arranged on battery core two ends, includes pole plate, pole and lug.Lug is formed by positive plate or negative plate margin tape wrapping, with pole plate Full connected, forms full extreme ear structure; For improving the conductivity between lug and pole plate, pole plate also scribbles conducting resinl.Generally, extreme ear structure provided by the invention, adopts collector blank tape to be lug, does not need external lug, insulating tape is not needed to carry out sealing-in, adopt the battery of this structure, specific energy is large, and internal resistance is little, homogeneous current distribution, decrease the operation of connecting tab, be conducive to industrialization and use, can greatly enhance productivity.Pole plate and shell or inner casing are sealedly and fixedly connected by punching press, the capacity of electrokinetic cell of the present invention is between 20-400Ah, can larger capacity be held, not need to use a large amount of battery cells, effectively can solve the problem that existing electrokinetic cell consistency is poor, heat radiation is difficult, the life-span is short.

Accompanying drawing explanation

Fig. 1 is the cross section structure schematic diagram of annular lithium ion battery of the present invention;

Fig. 2 is the plan structure schematic diagram of annular lithium ion battery of the present invention;

Fig. 3 is the perspective view of annular lithium ion battery embodiment one of the present invention;

Fig. 4 is the perspective view of annular lithium ion battery embodiment two of the present invention;

Fig. 5 is the perspective view of annular lithium ion battery embodiment three of the present invention.

Embodiment

The invention discloses a kind of annular lithium ion battery, as Fig. 1, include: the shell 1 of cylindrical surface structure, be nested in the inner casing 2 of the cylindrical surface structure in shell 1 inner chamber, the battery core 3 between shell and inner casing and be positioned at the electrode 4 at battery core two ends; Described battery core 3 comprises multi-disc positive plate, barrier film and negative plate and adopts winding method arrangement to be connected, and barrier film is interval between adjacent positive plate, negative plate; Wherein, described electrode 4 includes: pole plate 42, pole and lug 41; The outwardly blank tape winds portions of the positive plate that described lug 41 is battery core or the outer end of negative plate and being formed, lug and positive plate or negative plate connect as one; Described lug is directly connected with pole plate, and pole plate plane orthogonal is in the face of cylinder of shell and shell, and pole plate is fixedly connected with by impact style with inner casing or shell, and pole plate 42 is provided with pole.

Conductive adhesive layer is provided with between described lug 41 and pole plate 42.The setting of conductive adhesive layer can increase the conductivity of lug and pole plate contact-making surface.

In order to prevent current leakage on pole plate 42 in shell, at shell 1 and pole plate 42 contact area, arrange body seal glue-line, equally, powering on to flow to prevent pole plate drains to inner casing, at inner casing and pole plate contact area, is provided with inner casing sealant layer equally.

Described pole plate 42 adopts cirque structure, in addition for the ease of the extraction of electrode, pole plate is also provided with pole, and pole is fixedly connected with by riveted joint with pole plate 42.

Described pole is arranged on the centre position of pole plate 42 or the marginal position of pole plate 42.

Below in conjunction with specific embodiment, the invention will be further described.

Embodiment one:

As Fig. 1,2,3, the annular lithium ion battery of the present embodiment includes shell 1, inner casing 2, battery core 3 and electrode 4 four parts, and shell 1 and inner casing 2 are respectively cylindric; Shell 1 is provided with the outer fin 11 vertical with shell cylindrical outer surface, inner casing 2 is provided with vertical with inner casing internal surface of column in fin 21, the inner chamber of described inner casing 2 is the air flow channel of up/down perforation; Battery core 3 is wound between shell 1 and inner casing 2, and being reeled successively by positive plate, barrier film and negative plate forms; Electrode 4 is arranged on the upper/lower terminal of battery core 3, comprises pole plate 42, pole 43 and lug 41 3 part.

At shell 1 and pole plate 42 contact area, the body seal glue-line of setting is loop configuration; At inner casing and pole plate contact area, be provided with the inner casing sealant layer of loop configuration equally.

Pole plate 42 is also provided with two explosion-proof valves 5 and two poles 43, in cross four ends being symmetrically distributed in pole plate 42, pole 43 adopts bar shape boss structure.

Embodiment two:

The present embodiment is different from embodiment one to be, as Fig. 4, pole plate 42 is provided with an explosion-proof valve 5 and a pole 43, the two ends at the center being distributed in pole plate 42 that is centrosymmetric, pole 43 adopts bar shape boss structure.

Embodiment three:

The present embodiment is different from embodiment two to be, as Fig. 5, pole plate is provided with a pole 44, pole 44 is the torus concentric with inner casing, and the inner surface of pole 44 is provided with screw thread 441; Pole plate is provided with a safety valve.

Above-mentioned listed specific implementation is nonrestrictive, and to one skilled in the art, not departing from the scope of the invention, the various modifications and variations of carrying out, all belong to protection scope of the present invention.

Claims

1. Ring-type lithium-ion battery, including: a cylindrical shell (1), a cylindrical inner shell (2) nested in the inner cavity of the shell (1), and an electric battery between the shell and the inner shell. A core (3) and electrodes (4) positioned at both ends of the electric core; the electric core (3) includes a plurality of positive electrode sheets, a separator and a negative electrode sheet, and the plurality of positive electrode sheets, separator films and negative electrode sheets are wound arrangement and connection, the separator is spaced between adjacent positive and negative plates; it is characterized in that: the electrode (4) includes: a pole plate (42), a pole and a pole ear (41); the pole The ear (41) is formed by coiling the blank tape part protruding outward from the outer end of the positive pole piece or the negative pole piece of the battery, and the pole ear is connected with the positive pole piece or the negative pole piece as a whole; the pole ear is directly connected with the pole plate , the plane of the polar plate is perpendicular to the outer shell and the cylindrical surface of the outer shell, the polar plate is fixedly connected with the inner shell or the outer shell by stamping, and the polar plate (42) is provided with a pole.

2. The ring-type lithium ion battery according to claim 1, characterized in that: a conductive adhesive layer is arranged between the tab (41) and the pole plate (42).

3. The annular lithium-ion battery as claimed in claim 2, characterized in that: in the contact area between the shell (1) and the pole plate (42), a shell sealant layer is set, and the inner shell is in contact with the pole plate. The area is provided with an inner casing sealant layer.

4. The annular lithium-ion battery as claimed in claim 2, characterized in that: the polar plate (42) adopts a circular structure, and a pole is arranged on the pole plate, and the pole plate and the pole plate (42) pass through Riveted fixed connection.

5. The ring-shaped lithium-ion battery according to any one of claims 1 to 4, characterized in that: the pole is arranged in the middle of the pole plate (42) or at the edge of the pole plate (42).

6. The annular lithium-ion battery as claimed in claim 5, characterized in that: it comprises four parts, the outer shell (1), the inner shell (2), the electric core (3) and the electrode (4), and the outer shell (1) and the inner shell (2) are respectively cylindrical; the outer shell (1) is provided with an outer cooling fin (11) perpendicular to the outer cylindrical surface of the outer shell, and the inner shell (2) is provided with an inner cooling fin perpendicular to the inner cylindrical surface of the inner shell sheet (21), the inner cavity of the inner casing (2) is an air flow channel through up and down; the battery cell (3) is wound between the outer casing (1) and the inner casing (2), and the positive electrode sheet, the separator The electrode (4) is arranged on the upper and lower ends of the battery core (3), including three parts: the pole plate (42), the pole (43) and the pole ear (41).

7. The annular lithium-ion battery as claimed in claim 6, characterized in that: in the contact area between the outer shell (1) and the polar plate (42), the outer shell sealant layer provided is a ring structure; The plate contact area is also provided with a ring-shaped inner shell sealant layer.

8. The ring-type lithium-ion battery according to claim 6, characterized in that: two explosion-proof valves (5) and two poles (43) are arranged on the pole plate (42), which are symmetrically distributed in a cross shape At the four ends of the pole plate (42), the pole post (43) adopts a cylindrical boss structure.

9. The ring-type lithium ion battery as claimed in claim 5, characterized in that: said pole plate (42) is provided with an explosion-proof valve (5) and a pole (43), which are center-symmetrically distributed on the pole plate At both ends of the center of (42), the pole post (43) adopts a columnar boss structure.

10. The annular lithium ion battery as claimed in claim 5, characterized in that: a pole (44) is arranged on the pole plate, the pole (44) is a ring concentric with the inner shell, and the pole The inner surface of (44) is provided with threads (441); a safety valve is provided on the pole plate.