CN203071159U

CN203071159U - Plastic casing lithium ion secondary battery with multiple cell wraps

Info

Publication number: CN203071159U
Application number: CN2013200880214U
Authority: CN
Inventors: 张守祥; 文一波; 李雷; 涂国营; 吴传勇
Original assignee: HUNAN SOUNDDON NEW ENERGY CO Ltd
Current assignee: Soundon New Energy Technology Co Ltd
Priority date: 2013-02-27
Filing date: 2013-02-27
Publication date: 2013-07-17
Anticipated expiration: 2023-02-27

Abstract

The utility model discloses a plastic casing lithium ion secondary battery with multiple cell wraps. The plastic casing lithium ion secondary battery comprises a positive plate, diaphragm paper, a negative plate, a plastic casing, a plastic casing cover plate and a cover plate stud, wherein the cover plate stud is composed of a conductive pole on the upper half part and a connection plate on the lower half part; the positive plate and the negative plate are arranged on two sides of the diaphragm paper in a laminated manner; the positive plate, the diaphragm paper and the negative plate form a cell group; the cell group is packed to form a cell wrap; a plurality of cell wraps are bundled up in parallel; cell wrap tabs of the cell wraps are connected with the connection plate; the cell wraps are arranged in the plastic casing; and ending adhesive tapes are stuck on the cell wraps. By connecting the tabs of the multiple cell wraps and connecting the cell wrap tabs with the connection plate though a ultrasonic welder, the plastic casing lithium ion secondary battery provided by the utility model solves the problems of large internal resistance dispersion, high possibility of tab fracture, metal dusts and inadaptability to high-rate discharge of a large-capacity high-power laminated battery, and has the advantages of long service life and high safety and reliability.

Description

The plastic material case lithium ion of a kind of multicore secondary cell

Technical field

The utility model relates to a kind of lithium rechargeable battery, particularly the plastic material case lithium ion of a kind of multicore secondary cell.

Background technology

In recent years, lithium battery because operating voltage height, energy density are big, memory-less effect, have extended cycle life, advantage such as pollution-free, be applied to more and more widely progressively replace the major product that traditional rechargeable battery becomes field of batteries in consumption, power, energy storage and the special purpose battery.Expansion along with market, demand to the large-capacity high-power lithium ion secondary battery is also increasing, as mobile communication base station, the peaking power source of wind and light generating system, car lithium battery bag, the frigid zone first aid of the back-up source class markets such as stand-by power supply and frigid zone electric motor car power supply of speedily carrying out rescue work very big demand is arranged all.The big capacity plastic housing core of lithium ion cell bag lug of present known lamination connects usual way with cover plate to be had: ultrasonic bonding, double-screw bolt are connected and the laser penetration welding; Wherein connect in the majority with ultrasonic bonding, double-screw bolt.

The shortcoming of traditional ultrasonic bonding has: the soldering polar ear number of plies is usually less than 100 layers, and after the welding number of plies increases, power output in the time of must improving the supersonic welder welding, the high temperature that its moment produces cause that easily the diaphragm paper at lug place shrinks, and forms potential safety hazard; Ultrasonic equipment maintenance difficulty, the welding number of plies is more than 80 layers the time, usually be under the hard service, the welding machine consistency of product descends, its rosin joint product is difficult to be aware, influence the consistency of battery, be unfavorable for follow-up battery combo and assembling, influence fail safe and the reliability of battery.

The internal resistance of cell that double-screw bolt connects is big, only is suitable for the continuous discharge of the following electric current of normal temperature 1C usually, can't satisfy the required high power requirement of equipment, and for example more than 1m Ω, discharge-rate is poor usually for 50Ah lithium rechargeable battery 1KHz AC impedance.

The utility model content

In order to solve the problems of the technologies described above, the utility model provides that a kind of internal resistance is low, long service life, the safe and reliable plastic material case lithium ion of multicore secondary cell.

The technical scheme that the utility model addresses the above problem is: the plastic material case lithium ion of a kind of multicore secondary cell, comprise positive plate, diaphragm paper, negative plate, plastic housing, plastic housing cover plate and cover plate double-screw bolt, described cover plate double-screw bolt is made of the conduction pole of the first half and the brace of the latter half; The brace of the anodal conductive pole of plastic housing cover plate lower end is with after the positive plate anode ear links to each other, pass the positive terminal hole of reserving on the plastic housing cover plate, form anode behind the gluing clamp nut, the brace of plastic housing cover plate negative pole conductive pole lower end is with after the negative plate negative electrode lug links to each other, pass the negative terminal hole of reserving on the plastic housing cover plate, form battery cathode behind the gluing clamp nut, positive plate, the stacked two sides that is arranged in diaphragm paper of negative plate, positive plate, diaphragm paper, negative plate constitutes electric core utmost point group, described electric core utmost point group packing back forms the core bag, a plurality of core bags band together side by side, and the core bag lug of described core bag is connected on the brace, and described core bag is positioned at plastic housing.

Above-mentioned core is wrapped and is posted the ending gummed paper.

The beneficial effects of the utility model are: the utility model adopts the parallel connection of multicore bag lug, core bag lug is connected by supersonic welder with brace, the welding machine number of plies of battery pole ear reduces to below 50 layers, supersonic welding acc power output when reducing the lug welding effectively disappears, reduce the diaphragm paper contraction that the lug caloric value causes, lug breaks, improve the consistency of lug welding, stop rosin joint hidden danger to the influence of cell resistance, improve the consistency of battery, solving large-capacity high-power laminated batteries lug, once to weld more than 80 layers internal resistance of cell dispersion with ultrasonic bond big, lug breaks easily, produce metallic dust, be not suitable for the problem of high-multiplying power discharge, long service life, safe and reliable.

Description of drawings

Fig. 1 is the end view of the utility model core bag.

Fig. 2 is the front view of the utility model core bag.

Fig. 3 is the utility model multicore bag lug and brace welding schematic diagram.

Fig. 4 is the utility model plastic housing lithium rechargeable battery schematic diagram.

Among the figure: 1. single core bag lug prewelding solder joint, 2. core bag negative electrode lug solder joint, 3. core bag anode ear solder joint, 4. electric core utmost point group, 5. laminated batteries core bag, 6. ending gummed paper, 7. core bag lug, the 8. first core bag, the 9. second core bag, 10. brace, 11. plastic housing cover plates, 12. conduction poles, 13. nuts.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described.

As shown in Figure 1 and Figure 2, the utility model comprises positive plate, diaphragm paper, negative plate, and positive plate, negative plate are arranged in the two sides of diaphragm paper, and positive plate, diaphragm paper, negative plate constitute electric core utmost point group 4, described electric core utmost point group 4 packing backs form core bag 5, post ending gummed paper 6 on the core bag 5.

As shown in Figure 3, the first core bag 8 and the second core bag 9 band together side by side, the core bag lug 7 of the

first core bag

8 and 9 two core bags of the second core bag is connected on the brace 10, the cover plate double-screw bolt is made of the conduction pole 12 of the first half and the brace 10 of the latter half, the conduction pole 12 of cover plate double-screw bolt passes the reservation pole hole of plastic housing cover plate 11, by clamp nut 13 cover plate double-screw bolt and plastic housing cover plate 11 are fixed together, make the conduction pole 12 of cover plate double-screw bolt form electrode.

As shown in Figure 4, be placed with core bag, electrolyte and insulating support in the plastic housing, close lid back iron plate sealing mouth.

Claims

1. the plastic material case lithium ion of multicore secondary cell, comprise positive plate, diaphragm paper, negative plate, plastic housing, plastic housing cover plate and cover plate double-screw bolt, it is characterized in that: described cover plate double-screw bolt is made of the conduction pole of the first half and the brace of the latter half; The brace of the anodal conductive pole of plastic housing cover plate lower end is with after the positive plate anode ear links to each other, pass the positive terminal hole of reserving on the plastic housing cover plate, form anode behind the gluing clamp nut, the brace of plastic housing cover plate negative pole conductive pole lower end is with after the negative plate negative electrode lug links to each other, pass the negative terminal hole of reserving on the plastic housing cover plate, form battery cathode behind the gluing clamp nut, positive plate, the stacked two sides that is arranged in diaphragm paper of negative plate, positive plate, diaphragm paper, negative plate constitutes electric core utmost point group, described electric core utmost point group packing back forms the core bag, a plurality of core bags band together side by side, and the core bag lug of described core bag is connected on the brace, and described core bag is positioned at plastic housing.

2. the plastic material case lithium ion of multicore as claimed in claim 1 secondary cell, it is characterized in that: described core is wrapped and is posted the ending gummed paper.