CN203521532U

CN203521532U - High-safety polymer lithium ion battery

Info

Publication number: CN203521532U
Application number: CN201320610313.XU
Authority: CN
Inventors: 嵇雷; 雷曙光; 李健; 孙彩亮
Original assignee: Baoding Fengfan New Energy Co Ltd
Current assignee: Baoding Fengfan New Energy Co Ltd
Priority date: 2013-09-30
Filing date: 2013-09-30
Publication date: 2014-04-02
Anticipated expiration: 2023-09-30

Abstract

The utility model relates to a high-safety polymer lithium ion battery, which comprises a core formed by winding a positive plate, a diaphragm and a negative plate, wherein the positive plate comprises a middle aluminum foil and positive plate dressings coated on two side surface of the aluminum foil. The high-safety polymer lithium ion battery is characterized in that a lengthened aluminum foil is arranged at the tail part of the positive pole plate and winds the core by a circle. According to the high-safety polymer lithium ion battery, the internal short circuit of the battery can be effectively avoided; the current of the battery under the overcharged and short-circuit condition can be reduced, the heat conduction and release equivalent weight can be decreased, and the thermal runaway risk of the battery can be reduced; the through lengthening the aluminum foil at the tail part of a positive pole, the pole sheet at the outermost ring of the battery can be guaranteed to be an aluminum foil, when accidental conditions that the battery is pierced by an external sharp conductor and the like happen, the aluminum can fast conduct large current generated due to short circuit inside the battery through the conductor, the fire of the battery can be effectively prevented, and the safety performance of the battery can be enhanced.

Description

A kind of polymer Li-ion battery of high security

Technical field

The utility model relates to a kind of storage battery, especially a kind of polymer Li-ion battery of high security.

Background technology

In today of scientific and technological develop rapidly, various mobile electronic devices are widely applied in human lives, and lithium battery also develops rapidly thereupon becomes an industry important in secondary cell field.Lithium battery in the combination property of the aspects such as specific capacity, memory-less effect, long-life, environmental protection considerably beyond other secondary cells, but in high capacity cell field the rarely seen figure to lithium battery, its key issue is due to the restriction that is subject to lithium battery fail safe.In recent years, progressively use along with lithium ion battery, its security incident happens occasionally, as apple in 2006, ThinkPad are called back because of battery security problem, 2008 there is event on fire in Honda hybrid electric vehicle, and within 2011, Shanghai 825 road pure electric bus are because of overheated spontaneous combustion on fire of battery etc.Above-mentioned Event Description lithium ion battery safety performance is in urgent need to be improved, and the safety issue that effectively solves lithium ion battery is imperative.

Utility model content

The purpose of this utility model is the drawback for prior art, and a kind of polymer Li-ion battery that can effectively prevent internal short-circuit of battery, reduce the high security of battery thermal runaway risk is provided.

Problem described in the utility model is by realizing with following technical proposals:

A kind of polymer Li-ion battery of high security, it comprises the volume core of being reeled and being formed by positive plate, barrier film, negative plate, described positive plate consists of middle part aluminium foil and the positive plate dressing that is coated in aluminium foil two sides, special feature is: described positive plate afterbody is provided with the aluminium foil of one section of lengthening, and the aluminium foil of this lengthening is wound around a week, volume core outer ring.

The polymer Li-ion battery of above-mentioned high security, layer of metal oxide-coated layer is set up on a surface of described barrier film, and the thickness of described metal oxide-coated layer is 1-5 μ m, metal oxide-coated aspect anticathode sheet.

The polymer Li-ion battery of above-mentioned high security, the positive plate dressing of described positive plate two sides and the intersection of aluminium foil are covered by insulating tape.

The utility model improves for improving polymer Li-ion battery safety issue, and its feature is as follows: insulating tape together with 1, positive plate head respectively being pasted with intersection positive and negative, afterbody dressing district Yu Wei dressing district, effectively prevents internal short-circuit of battery; 2, surface-coated one deck of barrier film is improved to the coat of battery safety, coat increases pole piece sheet resistance, make battery overcharge and short-circuit conditions under current reduction, heat conduction and discharge equivalent and reduce, reduce the risk of battery thermal runaway, thereby improve the security performance of battery; 3, by anodal afterbody aluminium foil, lengthen, can guarantee that battery outmost turns pole piece is one deck aluminium foil, when making battery externally sharp conductor piercing through the fortuitous event such as battery and occurs, the large electric current that aluminium foil can produce internal short-circuit of battery rapidly transfers out by conductor, can effectively prevent that battery is on fire, thereby improve the fail safe of battery.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is the schematic diagram of the utility model volume cored structure;

Fig. 2 is the zoomed-in view at Fig. 1 A place;

Fig. 3 is the schematic diagram in positive plate front;

Fig. 4 is the schematic diagram of positive plate reverse side;

Fig. 5 is the schematic diagram of barrier film.

In figure, each list of reference numerals is: 1, volume core, 2, positive plate, 2-1, aluminium foil, 2-2, positive plate dressing 3, negative plate, 4, barrier film, 4-1, metal oxide-coated layer, 5, insulating tape.

Embodiment

Referring to Fig. 1, Fig. 3, Fig. 4, the utility model comprises the volume core 1 of being reeled and being formed by positive plate 2, barrier film 4, negative plate 3 laminations.Wherein, positive plate 2 consists of middle part aluminium foil 2-1 and the positive plate dressing 2-2 that is coated in aluminium foil two sides.One of improvement of the present utility model is: positive plate afterbody is provided with the aluminium foil of one section of lengthening, and the aluminium foil of this lengthening will guarantee to be wound around the outer ring one week of volume core 1 when reeling volume core.When this structure makes battery externally sharp conductor pierces through the fortuitous event such as battery and occurs, the large electric current that aluminium foil can produce internal short-circuit of battery rapidly transfers out by conductor, effectively prevents that battery is on fire, the fail safe of raising battery.

Referring to Fig. 1, Fig. 2, Fig. 5, another improvement of the present utility model is: layer of metal oxide-coated layer 4-1 set up on a surface of barrier film 4, and the thickness of metal oxide-coated layer is 1-5 μ m, metal oxide-coated aspect anticathode sheet 3.Metal oxide-coated layer is to be mixed by binding agent, solvent and metal oxide, and metal oxide is selected from least one in aluminium oxide, zirconia, titanium oxide.Metal oxide-coated layer has increased pole piece sheet resistance, make battery overcharge and short-circuit conditions under current reduction, heat conduction and discharge equivalent and reduce, reduces the risk of battery thermal runaway.

Referring to Fig. 3, Fig. 4, the utility model to another architecture advances of positive plate is: the positive plate dressing 2-2 of positive plate 2 two sides and the intersection of aluminium foil 2-1 are covered by insulating tape 5.Fig. 3 is the schematic diagram of positive plate positive (medial surface while being wound around volume core), left end (head) and right-hand member (afterbody) in positive plate front has one section of exposed aluminium foil 2-1 as seen from the figure, by insulating tape 5, the intersection of positive plate dressing 2-2 and aluminium foil 2-1 is covered, can effectively prevent internal short-circuit of battery.Fig. 4 is the schematic diagram of positive plate reverse side (lateral surface while being wound around volume core), left end (head) and right-hand member (afterbody) at positive plate reverse side also has one section of exposed aluminium foil 2-1 as seen from the figure, by insulating tape 5, the intersection of positive plate dressing 2-2 and aluminium foil 2-1 is covered equally, play the effect that prevents internal short-circuit of battery.

Claims

1. the polymer Li-ion battery of a high security, it comprises the volume core (1) of being reeled and being formed by positive plate, barrier film, negative plate, described positive plate (2) consists of middle part aluminium foil (2-1) and the positive plate dressing (2-2) that is coated in aluminium foil two sides, it is characterized in that: described positive plate afterbody is provided with the aluminium foil of one section of lengthening, the aluminium foil of this lengthening is wound around a week, volume core outer ring.

2. the polymer Li-ion battery of high security according to claim 1, it is characterized in that, layer of metal oxide-coated layer (4-1) is set up on a surface of described barrier film (4), the thickness of described metal oxide-coated layer is 1-5 μ m, metal oxide-coated aspect anticathode sheet (3).

3. the polymer Li-ion battery of high security according to claim 2, is characterized in that, the positive plate dressing (2-2) of described positive plate (2) two sides and the intersection of aluminium foil (2-1) are covered by insulating tape (5).