CN207637936U

CN207637936U - A kind of lithium ion battery coil core structure

Info

Publication number: CN207637936U
Application number: CN201721659476.1U
Authority: CN
Inventors: 吴华斌
Original assignee: Shenzhen Tianjin New Energy Tech Co Ltd; Shenzhen Tianjin New Energy Technology Co Ltd
Current assignee: Shenzhen Tianjin New Energy Tech Co Ltd; Shenzhen Tianjin New Energy Technology Co Ltd
Priority date: 2017-12-01
Filing date: 2017-12-01
Publication date: 2018-07-20
Anticipated expiration: 2027-12-01

Abstract

The utility model discloses a kind of lithium ion battery coil core structures, including battery roll core, negative electrode lug and anode ear；At the top of the battery roll core, and sticks in the first side of the negative electrode lug and have at least one first high tempreture tape；The high tempreture tape is affixed to its back side, and the diaphragm paper of critical piezoelectric battery core upper end from battery roll core front, and the diaphragm paper is made to be tilted towards a direction in battery roll core front or its back side.The utility model sticks on high tempreture tape by the one or both sides at the top of battery roll core at negative electrode lug, it can effectively prevent diaphragm paper and generate contraction because of temperature rise, it avoids that short circuit occurs between positive plate and negative plate, improves external short-circuit of battery and test percent of pass, improve the security performance of battery.

Description

A kind of lithium ion battery coil core structure

Technical field

The utility model is related to field of lithium ion battery more particularly to a kind of lithium ion battery coil core structures.

Background technology

Currently, lithium ion battery have many advantages, such as it is higher than energy, recycle often, storage time it is long, not only just It takes as being used widely on mobile phone, DV and laptop computer on formula electronic equipment, and is widely used in In terms of the large and medium-sized electrical equipment such as electric vehicle, electric bicycle and electric tool.

However, the safety that the principal element that restriction high power capacity and power-type lithium ion battery commercialization are promoted is battery is asked Topic, especially under abuse conditions (such as short circuit, hot situations such as abusing, overcharge, piercing through) will appear catch fire, accident of exploding.Cause This, though the ratio energy of lithium ion battery is high, security requirement is also very high.The battery usually made must pass through external short circuit Experiment etc. a series of safety test, and in an experiment it is missing of ignition, do not explode.

Digital lithium ion battery domestic at present is that the smooth of production often uses polyethylene single layer wet method in the production process Diaphragm, and such diaphragm is due to itself material property that its thermal contraction performance is poor, the tests such as corresponding external short-circuit of battery are logical It is low to cross rate.

Therefore, the prior art is defective, needs to improve.

Utility model content

Technical problem to be solved in the utility model is：A kind of raising external short-circuit of battery test percent of pass is provided, is carried The lithium ion battery coil core structure of the security performance of high battery.

The technical solution of the utility model is as follows：A kind of lithium ion battery coil core structure, including battery roll core, negative electrode lug and Anode ear；At the top of the battery roll core, and sticks in the first side of the negative electrode lug and have at least one first high tempreture tape；Institute It states high tempreture tape and is affixed to its back side, and the diaphragm paper of critical piezoelectric battery core upper end from battery roll core front, make the diaphragm paper It is tilted towards a direction in battery roll core front or its back side.

Applied to above-mentioned technical proposal, in the lithium ion battery coil core structure, at the top of the battery roll core, and Sticking in the second side of the negative electrode lug has at least one second high tempreture tape.

Applied to each above-mentioned technical proposal, in the lithium ion battery coil core structure, the high tempreture tape is PET materials The thickness of the high tempreture tape of matter, the high tempreture tape is 0.02mm-0.03mm, and heat resistance is 150 DEG C or more.

Using the above scheme, the utility model sticks on high temperature by the one or both sides at the top of battery roll core at negative electrode lug Gummed paper can effectively prevent diaphragm paper and generate contraction because of temperature rise, avoids that short circuit occurs between positive plate and negative plate, improves electricity Pond external short circuit tests percent of pass, improves the security performance of battery.

Description of the drawings

Fig. 1 is the positive structure schematic of embodiment 1 in the utility model；

Fig. 2 is the structure schematic diagram of embodiment 1 in the utility model；

Fig. 3 is the positive structure schematic of embodiment 2 in the utility model；

Fig. 4 is the structure schematic diagram of embodiment 2 in the utility model.

Specific implementation mode

Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.

Embodiment 1

Present embodiments provide a kind of lithium ion battery coil core structure, as illustrated in fig. 1 and 2, lithium ion battery coil core structure Including battery roll core, negative electrode lug 101 and anode ear 102；At the top of the battery roll core, and in the negative electrode lug 101 First side, which is sticked on, the first high tempreture tape 104 and the first high tempreture tape 105；First high tempreture tape 104 and the first high tempreture tape 105 It is affixed to its back side 22 from battery roll core front 11, during patch, the first high tempreture tape 104 and the first high tempreture tape 105 are tight The diaphragm paper 103 of piezoelectric battery core upper end makes the diaphragm paper 103 towards a side in battery roll core front 11 or its back side 22 To inclination, wherein the front 11 of battery roll core can be tilted towards, the back side 22 of battery roll core, inclined angle can also be tilted towards Degree does not have an impact it, can arbitrarily be arranged.

Stick on high tempreture tape in side at the top of the battery roll core at negative electrode lug.The material of the high tempreture tape is PET, wherein PET is polyethylene terephthalate, and the thickness of the high tempreture tape is 0.03mm, the heat resistance of the high tempreture tape 150 DEG C or more.The high tempreture tape pasted is affixed to the diaphragm paper at the back side and critical piezoelectric battery core upper end from battery roll core front, makes Upper end diaphragm paper tilts towards a direction.Battery roll core carries out set spacer ring and fixed spacer ring again afterwards, and is fabricated to battery, takes wherein 10 A battery carries out external short circuit security performance test, records test result.

Embodiment 2

Present embodiments provide a kind of lithium ion battery coil core structure, as shown in Figures 3 and 4, lithium ion battery coil core structure Including battery roll core, negative electrode lug 101 and anode ear 102；At the top of the battery roll core, and in the negative electrode lug 101 First side, which is sticked on, the first high tempreture tape 104 and the first high tempreture tape 105, and the second side in the negative electrode lug 101 Sticking on has the second high tempreture tape 106；First high tempreture tape 104, the first high tempreture tape 105 and the second high tempreture tape 106 are from battery Core front 11 is affixed to its back side 22, during patch, the first high tempreture tape 104, the first high tempreture tape 105 and the second high temperature Gummed paper 106 presses the diaphragm paper 103 of battery roll core upper end, makes the diaphragm paper 103 towards battery roll core front 11 or its back of the body One direction in face 22 tilts, wherein can be tilted towards the front 11 of battery roll core, can also be tilted towards the back side of battery roll core 22, inclined angle does not have an impact it, can arbitrarily be arranged.

Stick on high tempreture tape in both sides at the top of the battery roll core at negative electrode lug.The material of the high tempreture tape is PET, In, PET is polyethylene terephthalate, and the thickness of the high tempreture tape is 0.02mm, the high tempreture tape it is heat-resisting 150 DEG C or more of property.The high tempreture tape pasted is affixed to the diaphragm paper at the back side and critical writing that surpasses all the others core upper end from core front, make upper end every Film paper tilts towards a direction.Core carries out set spacer ring and fixed spacer ring again afterwards, is fabricated to battery, takes wherein 10 batteries to carry out outer Portion's short circuit safety can test, and record test result.

Comparative example, without patch high tempreture tape at negative electrode lug at the top of battery roll core, set spacer ring simultaneously fixed spacer ring is fabricated to battery, It takes wherein 10 batteries to carry out external short circuit security performance test, records test result.

Wherein, external short circuit test method：Under the conditions of 20 ± 5 DEG C of environment temperature, 1C5A constant-current constant-voltage chargings to 4.2V, Cut-off current≤20mA；Battery is placed in 60 ± 2 DEG C of drying box, the constant temperature after battery surface temperature reaches 60 ± 2 DEG C 30 minutes；With the conducting wire of 80 ± 20m of resistance Ω by battery plus-negative plate short circuit in explosion-proof tank, terminates and survey when there is following situations It tries, 1. battery failure, such as on fire, explosion；2. battery temperature drops to lower than peak value 20%；3. the short circuit time reaches for 24 hours.Process In observe and record battery surface maximum temperature.

2000mAh lithium ion batteries are made using the method for embodiment 1,2 and comparative example, respectively take 10 batteries to carry out external Short-circuit test, as a result such as following table：

In upper table, obtained from the test of embodiment 1,2 and comparative example following as a result, at the top of the battery roll core at negative electrode lug High tempreture tape is sticked in one or both sides, and external short circuit test percent of pass can have 50% in comparative example to be increased to 90% or more, Greatly improve external short-circuit of battery test percent of pass.

For lithium ion battery in external short-circuit test, the heat generated at negative electrode lug is highest, and the utility model passes through High tempreture tape is sticked in one or both sides at the top of the battery roll core at negative electrode lug, and presses diaphragm, makes upper end diaphragm paper towards a side It to inclination, can prevent diaphragm when short circuit at negative electrode lug from generating contraction because of temperature rise, in turn result in short circuit between positive/negative plate, Temperature, which steeply rises, leads to battery explosion.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle Within the scope of shield.

Claims

1. a kind of lithium ion battery coil core structure, including battery roll core, negative electrode lug and anode ear；It is characterized in that：

At the top of the battery roll core, and sticks in the first side of the negative electrode lug and have at least one first high tempreture tape；It is described High tempreture tape is affixed to its back side, and the diaphragm paper of critical piezoelectric battery core upper end from battery roll core front, makes the diaphragm paper court One direction at the battery roll core front or its back side tilts.

2. lithium ion battery coil core structure according to claim 1, it is characterised in that：At the top of the battery roll core, and And sticks in the second side of the negative electrode lug and have at least one second high tempreture tape.

3. lithium ion battery coil core structure according to claim 1 or 2, it is characterised in that：The high tempreture tape is PET materials The thickness of the high tempreture tape of matter, the high tempreture tape is 0.02mm-0.03mm, and heat resistance is 150 DEG C or more.