CN212571142U

CN212571142U - Lithium battery with protective safety device on tab

Info

Publication number: CN212571142U
Application number: CN202021326199.4U
Authority: CN
Inventors: 宋高知; 段兴祎; 余丹凡
Original assignee: Dongguan Nengyou Energy Technology Co ltd
Current assignee: Dongguan Nengyou Energy Technology Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2021-02-19
Anticipated expiration: 2030-07-08

Abstract

The utility model discloses a utmost point ear has protection safety device's lithium cell, including anodal aluminium foil, the negative pole copper foil, anodal utmost point ear, negative pole utmost point ear, first diaphragm and second diaphragm, first diaphragm is located between anodal aluminium foil and the negative pole copper foil, the second diaphragm is located one side that the anodal aluminium foil was kept away from to the negative pole copper foil, anodal aluminium foil, first diaphragm, negative pole copper foil and second diaphragm are laminated in proper order and are changeed into battery body with anodal aluminium foil as interior, battery body is the cylinder form, anodal utmost point ear is fixed on anodal aluminium foil, negative pole utmost point ear is fixed on the negative pole copper foil, the first end of negative pole utmost point ear is fixed on the negative pole copper foil, the second end of negative pole utmost point ear extends to the outside of negative pole copper foil, the cover has first soft protective sheath on the first end of negative pole utmost point ear. This utmost point ear has protection safety device's lithium cell has avoided the crooked problem that leads to puncturing the diaphragm of negative pole utmost point ear in the cylinder battery, has reduced the potential safety hazard.

Description

Lithium battery with protective safety device on tab

Technical Field

The utility model relates to a technical field of battery especially relates to a utmost point ear has lithium cell of protection safety device.

Background

Battery (Battery) refers to a device that converts chemical energy into electrical energy in a cup, tank, or other container or portion of a composite container that holds an electrolyte solution and metal electrodes to generate an electric current. Has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices that can generate electrical energy.

At present, in the lithium cell of cylindricality, the diaphragm is easily stabbed because of the reason that the arc is buckled to inside negative pole utmost point ear leads to the corner position, after stabbing the diaphragm, will directly switch on with anodal aluminium foil, forms the short circuit, causes the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at: the lithium battery with the tab having the protection safety device is provided, and the problem that the negative electrode tab in a cylindrical battery is bent to cause a diaphragm to be punctured is avoided by the lithium battery with the tab having the protection safety device, so that potential safety hazards are reduced.

To achieve the purpose, the utility model adopts the following technical proposal:

a lithium battery with a tab with a protective safety device comprises an anode aluminum foil, a cathode copper foil, an anode tab, a cathode tab, a first diaphragm and a second diaphragm, wherein the first diaphragm is positioned between the anode aluminum foil and the cathode copper foil, the second diaphragm is positioned on one side, away from the anode aluminum foil, of the cathode copper foil, the anode aluminum foil, the first diaphragm, the cathode copper foil and the second diaphragm are sequentially attached and rotate into a battery body with the anode aluminum foil as the inside, the battery body is in a cylindrical shape, the anode tab is fixed on the anode aluminum foil, the cathode tab is fixed on the cathode copper foil, a first end of the cathode tab is fixed on the cathode copper foil, a second end of the cathode tab extends to the outside of the cathode copper foil, and a first soft protective sleeve is sleeved on the first end of the cathode tab, the width of the first soft protective sleeve is larger than that of the negative pole lug.

Preferably, the battery body is covered with a cover film on the outside.

As a preferred technical solution, the material of the first soft protection cover is CPP or PP.

As an optimal technical scheme, the first end of the positive pole lug is fixed on the positive aluminum foil, the second end of the positive pole lug extends to the outside of the positive aluminum foil, the first end of the positive pole lug is sleeved with a second soft protective sleeve, and the width of the second soft protective sleeve is greater than that of the positive pole lug.

The utility model has the advantages that: the lithium battery with the tab with the protection safety device solves the problem that the bent negative electrode tab in a cylindrical battery causes the piercing of a diaphragm, and prevents the corner of the bent negative electrode tab from piercing the diaphragm and then being communicated with the positive electrode tab to form a short circuit, so that potential safety hazards are reduced.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a structural diagram of layers of a lithium battery with a tab having a protective safety device after unpacking according to an embodiment.

In fig. 1:

1. a positive aluminum foil; 2. a negative copper foil; 3. a positive electrode tab; 4. a negative electrode tab; 5. a first diaphragm; 6. a second diaphragm; 7. a first soft protective cover; 8. a second soft protective sleeve.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1, in this embodiment, a lithium battery with a tab having a protection safety device includes an anode aluminum foil 1, a cathode copper foil 2, an anode tab 3, a cathode tab 4, a first separator 5 and a second separator 6, where the first separator 5 is located between the anode aluminum foil 1 and the cathode copper foil 2, the second separator 6 is located on a side of the cathode copper foil 2 away from the anode aluminum foil 1, the first separator 5, the cathode copper foil 2 and the second separator 6 are sequentially bonded and wound into a battery body with the anode aluminum foil 1 as an inner side, the battery body is cylindrical, the anode tab 3 is fixed on the anode aluminum foil 1, the cathode tab 4 is fixed on the cathode copper foil 2, a first end of the cathode tab 4 is fixed on the cathode copper foil 2, and a second end of the cathode tab 4 extends to an outer side of the cathode copper foil 2, the cover has first soft protective sheath 7 on the first end of negative pole utmost point ear 4, the width of first soft protective sheath 7 is greater than the width of negative pole utmost point ear 4.

When anodal aluminium foil 1 first diaphragm 5 negative pole copper foil 2 with second diaphragm 6 is changeed and is rolled into during the battery body, the slice anodal utmost point ear 3 and slice negative pole utmost point ear 4 all can the arc bending, for anodal utmost point ear 3, negative pole utmost point ear 4 hardness teaching is big, at the commentaries on classics winding in-process, the junction corner of negative pole utmost point ear 4 is more sharp, punctures the diaphragm easily, punctures the back when the diaphragm, negative pole utmost point ear 4 will contact anodal copper foil, also with anodal utmost point ear 3 switches on mutually, forms the short circuit, generates heat and produces danger.

Add first soft protective sheath 7, first soft protective sheath 7 cover on the negative pole utmost point ear 4, work as when negative pole utmost point ear 4 is crooked, the tip of negative pole utmost point ear 4 with the place of first diaphragm 5 contact by first soft protective sheath 7 protects, the middle part of negative pole utmost point ear 4 with negative pole copper foil 2 connect switch on can, soft material first soft protective sheath 7 even worn out first diaphragm 5 also can not make because of insulating material's relation negative pole utmost point ear 4 with positive utmost point ear 3 switches on, and the security promotes by a wide margin.

Specifically, the outer side of the battery body is coated with a coating film.

The first soft protection cover 7 is made of CPP, and in other embodiments, the first soft protection cover 7 is made of PP.

The CPP material and the PP material are soft materials, the conductivity is extremely low, the CPP material and the PP material have electrolyte resistance and corrosion resistance, and the safety performance is improved.

The first end of anodal utmost point ear 3 is fixed on anodal aluminium foil 1, the second end of anodal utmost point ear 3 extends to anodal aluminium foil 1's outside, the cover has the soft protective sheath of second 8 on anodal utmost point ear 3's the first end, the width of the soft protective sheath of second 8 is greater than anodal utmost point ear 3's width.

Except that install on negative pole utmost point ear 4 first soft protective sheath 7, also correspondingly install on the tip of anodal utmost point ear 3 the soft protective sheath 8 of second, the material of the soft protective sheath 8 of second can be CPP material or PP material.

It should be noted that the above embodiments are only preferred embodiments of the present invention and the technical principles applied, and any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are covered by the protection scope of the present invention.

Claims

1. A lithium battery with a tab with a protective safety device is characterized by comprising an anode aluminum foil, a cathode copper foil, an anode tab, a cathode tab, a first diaphragm and a second diaphragm, wherein the first diaphragm is positioned between the anode aluminum foil and the cathode copper foil, the second diaphragm is positioned on one side of the cathode copper foil far away from the anode aluminum foil, the first diaphragm, the cathode copper foil and the second diaphragm are sequentially attached and rotate into a battery body with the anode aluminum foil as the inside, the battery body is in a cylindrical shape, the anode tab is fixed on the anode aluminum foil, the cathode tab is fixed on the cathode copper foil, the first end of the cathode tab is fixed on the cathode copper foil, the second end of the cathode tab extends to the outside of the cathode copper foil, and a first soft protective sleeve is sleeved on the first end of the cathode tab, the width of the first soft protective sleeve is larger than that of the negative pole lug.

2. The lithium battery with the tab provided with the protection safety device as claimed in claim 1, wherein the outside of the battery body is coated with a coating film.

3. The lithium battery with the tab provided with the protection safety device as claimed in claim 1, wherein the first soft protection sleeve is made of CPP or PP.

4. The lithium battery with the tab having the protection safety device as claimed in claim 1, wherein the first end of the positive electrode tab is fixed on the positive electrode aluminum foil, the second end of the positive electrode tab extends to the outside of the positive electrode aluminum foil, the first end of the positive electrode tab is sleeved with a second soft protective sleeve, and the width of the second soft protective sleeve is greater than the width of the positive electrode tab.