CN201478402U

CN201478402U - Lithium series secondary battery roll core and lithium series secondary battery

Info

Publication number: CN201478402U
Application number: CN2009201774659U
Authority: CN
Inventors: 张煜林; 孙科; 郑海信
Original assignee: JIAZHUO FAR EAST ENTERPRISES Ltd HONGKONG
Current assignee: JIAZHUO FAR EAST ENTERPRISES Ltd HONGKONG
Priority date: 2009-09-04
Filing date: 2009-09-04
Publication date: 2010-05-19
Anticipated expiration: 2019-09-04

Abstract

The utility model relates to a lithium series secondary battery roll core and a lithium series secondary battery, wherein the lithium series secondary battery roll core comprises a positive plate, a negative plate and a diaphragm which are closely combined together in a winding mode to form a roll core, a plate lug of the positive plate is arranged on one side of the positive plate and is arranged along the length direction of the positive plate, a plate lug of the negative plate is arranged on one side of the negative plate and is arranged in the length direction of the negative plate, and the plate lugs of positive plate and the negative plate are respectively arranged on the two ends of the roll core. The lithium series secondary battery uses the lithium series secondary battery roll core. The utility model can solve the thermal problem and the electrochemical problem of the roll core existing in the charge-discharge process, thereby being capable of increasing the electrochemical performance of the battery.

Description

Lithium based secondary battery volume core and lithium based secondary battery

Technical field

The utility model relates to a kind of lithium based secondary battery volume core and lithium based secondary battery.

Background technology

In recent years, the going deep into of the anxiety of the energy and environmental protection ideas, new-energy automobile more and more is subjected to people's favor and looks forward to.Existing battery has only lead-acid battery to use to serve as power source on automobile, but the lead-acid battery built-in problem is too many, can't move towards more wide commercial market.Lithium ion battery is the optimal selection of the power source that uses above of following automobile with its excellent performance.And lithium ion battery development trend from now on just develops to high power capacity, power type direction, and better outlet is only in this way just arranged.Along with continuing to bring out of new material, the updating of equipment, technology constantly perfect, lithium ion battery can be widely applied above the vehicles automobile eventually.

Lithium ion battery appears on the market at the beginning and just is subjected to liking very much of people with ' small but excellent ', thereby has captured the very big share of Battery Market rapidly, comes out top especially in the leading-edge field.Because the restriction of some conditions, lithium ion battery is being received very big restriction to development aspect the high power capacity.The call in market can not only rest on ' small but excellent ' field at the eager lithium ion battery that requires, and also will develop to high power capacity, power type direction, and the ability better service is in the mankind like this.

Existing lithium-ion electric pool technology and technology mainly concentrate on low capacity, small size aspect, are used in as fields such as mobile phone, portable electrical appliance, warming electronic products.The capacity of battery focuses mostly on below 5Ah, has difficulty in taking a step can be described as in the process of the development of high power capacity more, does not almost have too big breakthrough.

Use more lithium ion battery coil core to comprise positive plate at present, negative plate and barrier film, on positive plate and negative plate, be provided with the lug position, positive plate, the assembling of negative plate and barrier film mainly is the mode that adopts coiling or lamination, just, negative lug all is to draw from the same end of volume core short transverse, just promptly roll up core, negative electrode lug is in the same side of volume core short transverse, because the existence of battery thermal effect in charge and discharge process and the heat conductivility of employed material are inconsistent, just determined that the height of volume core can not be very high, also can not be very thick, otherwise the security performance of battery just can't guarantee, this also just must limit the height and the thickness of single battery volume core, thereby also limited the capacity of single battery, finally just limited the capacity of cell.The very difficult main cause of lithium ion battery that Here it is to the high-capacity battery development.And the mode of taking lamination can make suitable the doing greatly of the capacity of battery, but necessarily requires single pole piece to want enough big, and this will inevitably increase the manufacture difficulty of single pole piece, has reduced production efficiency, also equipment has been proposed higher requirement.Even if like this, the also impossible unconfined increase of the thickness of single battery, the housing of battery also has certain restriction and requirement after all.

Summary of the invention

First purpose of the present utility model is the problems referred to above at existing lithium ion battery coil core existence, provide a kind of and can solve heat problem, the electrochemical issues that the volume core exists in charge and discharge process, thereby the lithium based secondary battery that improves the chemical property of battery is rolled up core.

Second purpose of the present utility model is to adopt above-mentioned lithium based secondary battery volume core, and a kind of lithium based secondary battery is provided.

Lithium based secondary battery volume core of the present utility model, comprise positive plate, negative plate, barrier film, they combine closely in the mode of reeling, form the volume core, on described positive plate, negative plate, be provided with the lug position, the lug position of described positive plate is to be positioned at a side of positive plate and along the length direction setting of positive plate, the lug position of described negative plate is to be positioned at a side of negative plate and along the length direction setting of negative plate, the lug position of described positive plate and the lug position of negative plate lay respectively at the two ends of volume core.

Lithium based secondary battery of the present utility model has adopted above-mentioned lithium based secondary battery volume core of the present utility model.

Technique effect of the present utility model is:

1, the utility model is with a kind of brand new concept, and the notion that breaks traditions has been made a kind of single volume core of drawing lug from two ends, and the positive and negative lug of battery is drawn from the two ends of volume core short transverse respectively, and an end is a negative pole, and the other end is anodal; Be different from the conventional roll core fully and draw the making pattern of positive and negative lug by the same end of volume core height.Because the positive and negative lug of volume core is drawn respectively from the two ends of volume core, the electric current that just can disperse the volume core to flow through in charge and discharge process has more uniformly also been alleviated the destruction that battery is produced because of thermal effect in the charge and discharge process to a great extent.

2, the utility model has just improved the efficient of producing greatly owing to adopt the mode of reeling to make the volume core.In fact the positive and negative plate of single volume core of the present utility model is equivalent to an enough big positive plate and the enough big negative plate in the lamination mode, just these two pole pieces adopt the mode of reeling to be assembled together, just be equivalent to adopt enough big single positive plate and enough big single negative plate the mode of reeling to fit together, just improved production efficiency to a great extent.

3, the chemical property of battery can be improved to a great extent preferably along the length direction setting of pole piece in the lug position of pole piece in the utility model.

Description of drawings

Fig. 1 is the front view of traditional lithium ion battery coil core.

Fig. 2 is the stereogram of traditional lithium ion battery coil core.

Fig. 3 is the front view of the utility model embodiment.

Fig. 4 is the stereogram of the utility model embodiment.

Fig. 5, Fig. 6 have adopted the utility model embodiment to roll up the main TV structure figure and the plan structure figure of the lithium based secondary battery of core.

Embodiment

Fig. 2, Fig. 4 are the volume cores in the state diagram of just reeling when finishing, and follow-uply also will be pressed into flat such as Fig. 1, shown in Figure 3, refill and are made into battery.

Referring to Fig. 1 and Fig. 2, the tradition lithium ion battery coil core comprises positive plate, negative plate and two barrier films, on positive plate, its Width of negative plate upper edge, be provided with the lug position, positive plate, negative plate and barrier film adopt the mode of reeling to combine closely, form volume core 1, with anode ear 2, negative electrode lug 3 that lug position on positive plate, the negative plate is connected respectively all is to draw from the same end of volume core 1 short transverse, promptly rolls up the anode ear 2, negative electrode lug 3 of core 1 the same side in volume core 1 short transverse.

Referring to Fig. 3 and Fig. 4, present embodiment is a lithium based secondary battery volume core, comprise positive plate, negative plate and two barrier films, they combine closely in the mode of reeling, form volume core 6, because

lug position

5,6 do not need barrier film, therefore the width of barrier film is less than the width of finished product volume core, the lug position 5 of positive plate is to be positioned at a side of positive plate and along the length direction setting of positive plate, the length of lug position 5 equals the length of positive plate, the lug position 4 of negative plate is to be positioned at a side of negative plate and along the length direction setting of negative plate, the length of lug position 4 equals the length of negative plate, the lug position 5 of positive plate and the lug position 4 of negative plate lay respectively at the two ends of volume core 6, like this and positive plate, the lug position 5 of negative plate, 4 anode ears that connect respectively, negative electrode lug is just drawn from the two ends of volume core 6 respectively.

The manufacturing process of the foregoing description is as follows:

Making volume needed assembly of core and equipment has: positive plate, negative plate, diaphragm paper, manual coiling machine or sutomatic winding machine, volume pin, binding agent.On up-coiler, wind diaphragm paper by certain technological requirement, guarantee that two-layer diaphragm paper aligns concordant up and down, between two-layer diaphragm paper, place negative plate, a side that makes negative plate have the lug position is in the left side (right side) of diaphragm paper, on one deck diaphragm paper, place positive plate again, a side that makes positive plate have the lug position is in the right side (left side) of diaphragm paper, the lug position that has so just guaranteed positive and negative plate is in the both sides of volume core respectively, guarantees that positive and negative lug draws from the two ends of volume core.Start up-coiler, rotate the volume pin with certain speed, necessarily guarantee positive and negative plate and diaphragm paper to positive relationship, the place uses binding agent to fix barrier film in volume core ending.If the lug position of positive plate is on the top (bottom) of volume core, when placing negative plate so, the lug position of negative plate guarantees that in the bottom (top) of volume core the lug position of positive and negative plate is in the upper and lower of volume core respectively.

Referring to Fig. 5 and Fig. 6, adopted the lithium based secondary battery of the described volume core of the foregoing description, comprise battery case 8, be fixed on positive pole 7 and negative pole 9, electrolyte, anode ear, negative electrode lug and the volume core 6 at battery case 8 two ends, volume core 6 adopts the described volume core of the foregoing description, and anode ear, negative electrode lug are electrically connected with

lug position

5,4 welding of volume core 6 and with anodal 7 and negative pole 9 respectively.Adopt the lithium based secondary battery of the utility model lithium based secondary battery volume core, all belonged to protection range of the present utility model.

Claims

1. a lithium based secondary battery is rolled up core, comprise positive plate, negative plate, barrier film, they combine closely in the mode of reeling, form the volume core, on described positive plate, negative plate, be provided with the lug position, it is characterized in that: the lug position of described positive plate is to be positioned at a side of positive plate and along the length direction setting of positive plate, the lug position of described negative plate is to be positioned at a side of negative plate and along the length direction setting of negative plate, the lug position of described positive plate and the lug position of negative plate lay respectively at the two ends of volume core.

2. lithium based secondary battery volume core according to claim 1, it is characterized in that: the length of described lug position equals the length of pole piece.

3. a lithium based secondary battery is characterized in that: adopt claim 1 or 2 described lithium based secondary battery volume cores.