CN209544489U

CN209544489U - A kind of lithium battery

Info

Publication number: CN209544489U
Application number: CN201822262221.2U
Authority: CN
Inventors: 王玉廷
Original assignee: Individual
Current assignee: Hua Yanbin
Priority date: 2018-12-30
Filing date: 2018-12-30
Publication date: 2019-10-25
Anticipated expiration: 2028-12-30

Abstract

The utility model discloses a kind of lithium battery, including battery body, the battery body includes anode, cathode, electrolyte and diaphragm, and the diaphragm is arranged between cathode and anode, and the diaphragm is that four layer polypropylene melt-blow nonwovens are sequentially overlapped；The lithium battery has a safety feature, and the high rate performance of lithium battery is more excellent.

Description

A kind of lithium battery

Technical field

The utility model relates to battery technology fields, and in particular to a kind of lithium battery.

Background technique

In lithium ion battery composition, lithium ion battery separator is one of important composition of lithium ion, can be effectively Prevent that lithium ion battery positive and negative electrode from directly contacting and caused by short circuit；But allow lithium ion in charge and discharge, it can freely move It is dynamic.Currently, lithium ion battery separator material is mainly polyolefin based materials in the market, by dry process or wet processing preparation At, but its there are porositys and liquid retention it is low, transverse tensile strength and thermal stability are poor the disadvantages of, if lithium ion battery exists It uses, such as overcharges, over-discharge or short circuit under non-normal condition, lithium ion battery local temperature can be made excessively high, reach lithium-ion electric The melt temperature of pond diaphragm, to make the contraction of lithium ion battery separator occurrence of large-area and cause inside lithium ion cell short Road, cause lithium ion battery on fire or explosion etc. safety problems.

It is accordingly required in particular to a kind of lithium battery having a safety feature, to solve problems of the prior art.

Utility model content

Purpose of the utility model is to solve defects in the prior art, provide a kind of lithium electricity having a safety feature Pond, to solve problems of the prior art.

To achieve the above object, the technical solution of the utility model is as follows:

A kind of lithium battery, including battery body, the battery body include anode, cathode, electrolyte and diaphragm, it is described every Film is arranged between cathode and anode, and the diaphragm is that four layer polypropylene melt-blow nonwovens are sequentially overlapped.

In order to further realize the utility model, four layer polypropylene melt-blow nonwovens are adhesively fixed by compacting.

In order to further realize the utility model, every layer polypropylene melt-blow nonwoven with a thickness of 0.22.

Beneficial effect

(1) the utility model is that four layer polypropylene melt-blow nonwovens are sequentially overlapped by diaphragm, polypropylene melt-blown Non-woven cloth has many advantages, such as that porosity is high, microcellular structure is tortuous, liquid retention is high and dimensional contraction is small, and multi-layer polypropylene melt-blown is non- The superposition of woven cloths, thickness increase, and aperture reduces and pore-size distribution is also more uniform, as battery diaphragm material, significantly The security performance for improving lithium battery, when polypropylene melt-blown nonwoven fabric is four layers, the impedance of diaphragm is lower, and times of lithium battery Rate best performance.

Detailed description of the invention

Fig. 1 is the schematic diagram of internal structure of battery body in the utility model lithium battery；

Fig. 2 is the superposition schematic diagram of the utility model lithium battery septation.

Appended drawing reference:

1, positive；2, cathode；3, electrolyte；4, diaphragm.

Specific embodiment

The utility model is further described in detail with reference to the accompanying drawing, these attached drawings are simplified signal Figure, only illustrates the basic structure of the utility model, the direction of this specific implementation is using the direction Fig. 1 as standard in a schematic way.

Embodiment one

As Figure 1-Figure 2, the utility model lithium battery includes battery body, and battery body includes anode 1, cathode 2, electricity Solve liquid 3 and diaphragm 4, in which:

The active material of anode 1 is manganese oxide lithium material, and the active material of cathode 2 is Zinc material, and electrolyte 3 is containing lithium salts With the neutral aqueous solution of zinc salt, diaphragm 4 is arranged between cathode and anode.

Diaphragm 4 is that four layer polypropylene melt-blow nonwovens are sequentially overlapped, and four layer polypropylene melt-blow nonwovens pass through Compacting is adhesively fixed, every layer polypropylene melt-blow nonwoven with a thickness of 0.22.

The utility model is that four layer polypropylene melt-blow nonwovens are sequentially overlapped by diaphragm, and polypropylene melt-blown is non-to be knitted Making cloth has many advantages, such as that porosity is high, microcellular structure is tortuous, liquid retention is high and dimensional contraction is small, multi-layer polypropylene melt-blown non-woven The superposition of cloth, thickness increase, and aperture reduces and pore-size distribution is also more uniform, as battery diaphragm material, greatly improve The security performance of lithium battery, when polypropylene melt-blown nonwoven fabric is four layers, the impedance of diaphragm is lower, and lithium battery is forthright again It can be optimal.

Experiment one

Influence for the verifying polypropylene melt-blown nonwoven fabric difference number of plies to the high rate performance of lithium battery, takes polypropylene melt-blown Non-woven cloth carries out 1,2,3,4 and 5 layer of superposition respectively, is respectively labeled as sample 1, sample 2, sample 3, sample 4 and sample 5, Above-mentioned lithium ion battery can be detected by new prestige heavy-duty battery detection system using the above sample as the diaphragm of lithium ion battery Related electrochemistry, experiment lithium ion battery carry out charge and discharge under the rate of 0.2C, and recycle 5 times, later again respectively with 0.5,1,2,3,4,5C and 0.2C carry out charge-discharge test, and every kind circulation 5 times, be averaged, data recorded Analysis, experimental result are as follows:

	Discharge-rate (C)	0.2	0.5	1	2	3	4	5	0.2
										Sample 1	Specific discharge capacity (mAh/g)	130	116	98	2	0	0	0	131
Sample 2	Specific discharge capacity (mAh/g)	114	105	94	81	57	38	2	114
										Sample 3	Specific discharge capacity (mAh/g)	110	101	91	80	71	67	61	110
Sample 4	Specific discharge capacity (mAh/g)	117	107	97	85	76	71	68	118
										Sample 5	Specific discharge capacity (mAh/g)	91	83	74	64	58	51	43	90

As seen from the above table, with the increase of multiplying power, all different degrees of reduction of the specific discharge capacity of lithium ion battery；Because Lithium ion battery electromotive force is constant, and since electric current becomes larger, polarization resistance becomes larger, and causes the quick reduction of output voltage, subtracts in advance Small to arrive limitation voltage, so that lithium ion battery is not up to rated capacity, capacity reduces；Under conditions of 0.2C, 0.5C and 1C, examination The specific discharge capacity of sample 1 remains very high, respectively 130mAh/g, 116mAh/g, 98mAh/g, but when multiplying power increases to 2C, examination The specific discharge capacity of sample 1 reduces, and almost 0；And sample 2, in 5C, specific discharge capacity is almost 0；And sample 3, sample 4 and examination For sample 5 in 5C, specific discharge capacity is respectively 61mAh/g, 68mAh/g and 43mAh/g.The result shows that: it is knitted when polypropylene melt-blown is non- When making cloth and being superimposed to four layers, high rate performance is optimal.

The foregoing is merely the better embodiment of the utility model, the utility model is not limited to above-mentioned embodiment party Formula, there may be the structural modifications that part is small in implementation process, if various changes or modifications to the utility model are not The spirit and scope of the utility model are detached from, and are belonged within the scope of the claims and equivalents of the utility model, then originally Utility model is also intended to encompass these modification and variations.

Claims

1. a kind of lithium battery, including battery body, the battery body includes anode, cathode, electrolyte and diaphragm, the diaphragm It is arranged between cathode and anode, which is characterized in that the diaphragm is that four layer polypropylene melt-blow nonwovens are sequentially overlapped.

2. lithium battery according to claim 1, which is characterized in that four layer polypropylene melt-blow nonwovens pass through compacting bonding It is fixed.