CN217606996U - Structure is blocked to cylinder type lithium cell negative pole short circuit safety - Google Patents

Abstract

The utility model provides a structure is blocked to cylinder type lithium cell negative pole short circuit safety, cylindrical lithium cell structure is including shell, block, book core and negative pole busbar, the shell shaping is cylindrical structure, it installs in the shell according to the positive negative pole direction packing that corresponds to roll up the core, negative pole connection at roll core is provided with the negative pole busbar, the shaping has the contact boss on the negative pole busbar, the contact boss is higher than the surface of negative pole busbar, and be close to the setting to the negative pole shell, the shaping has smooth holding surface on the negative pole busbar of the side of contact boss, the fixed insulation resistor that is provided with on the holding surface, the insulation resistor is flat structure, and the plane is fixed on the holding surface, the thickness of insulation resistor is less than the relative height of contact boss, when this design has solved the battery and externally when the short circuit takes place, can produce high temperature, and then arouse inside short circuit and the problem that the battery damaged appears, have the security good, block effectually, reduce the advantage with the electrical risk.

Description

Structure is blocked to cylinder type lithium cell negative pole short circuit safety

Technical Field

The utility model relates to a protection architecture under the short circuit state of cylinder lithium cell improves, specifically is a cylinder type lithium cell negative pole short circuit safety blocks structure.

Background

The cylindrical lithium iron phosphate battery is a single battery structure manufactured into a cylinder, has fixed specifications, can use batteries with different specifications in different scenes according to requirements, can simultaneously combine a plurality of single battery packs into a battery pack to expand capacity voltage and adapt to more application scenes, and mainly comprises a shell, a winding core, a cover cap and the like, wherein the cathode of the battery is integrally formed with the shell in a stamping way, the winding core is an electric core formed by winding electrode materials and the like, the winding core is required to be connected with the anode and the cathode of the shell, the cathode of the winding core is connected to a bus bar, and the bus bar is connected with the shell in a spot welding way, need pass through the hole at core center with the welded needle during welding, directly support the bottom of negative pole, form the welding point, so busbar and shell negative pole main connection area are the size of welding point, this point also is the weakest position on the whole negative pole route, if when the battery short circuit, this department can burn out at first, the part with the shell contact on the busbar also is damaged, it can directly link with outside steel casing to roll up the core, the state that leads to the short circuit lasts exists, because the internal resistance of contact is higher, the temperature of electricity core can rise gradually, and finally lead to electric core diaphragm shrink deformation because of high temperature, electrode material in the book core can direct contact, lead to the inside short circuit of battery, the battery explosion appears easily, the scheduling problem fires.

Disclosure of Invention

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a cylinder type lithium cell negative pole short circuit safety and block the structure.

The utility model provides a technical scheme that above-mentioned problem adopted is: cylindrical lithium battery structure is including shell, block, roll up core and negative pole busbar, the shell shaping is cylindrical structure, it installs in the shell to roll up the core according to the positive negative pole direction packing that corresponds, negative pole connection at roll core is provided with the negative pole busbar, the last shaping of negative pole busbar has the contact boss, the contact boss is higher than the surface of negative pole busbar, and be close the setting to the negative pole shell, the shaping has smooth holding surface on the negative pole busbar of the side of contact boss, the fixed insulation blocking body that is provided with on the holding surface, the insulation blocking body is flat structure, and the plane is fixed on the holding surface, the thickness of insulation blocking body is less than the relative height of contact boss, it keeps apart and sets up in the clearance between negative pole busbar and the shell negative pole.

The design is a structural improvement for realizing the protection effect of a cylindrical lithium iron phosphate battery during short circuit, and solves the problem that the battery is damaged due to internal short circuit when the external short circuit occurs, and the battery has the advantages of high safety, good blocking effect and reduction of power consumption risk, is particularly suitable for application in a battery pack, blocks the single battery when the single battery fails, avoids the influence of high temperature on normal work of other batteries, improves safety, prolongs the service life of the whole battery, and has better reliability.

The whole packing of book core of battery in this structure is in the shell, and roll up the core need with the shell just, the negative pole is connected, roll up the core and connect for the efficient, adopt the busbar to connect at the negative pole, main contact segment on the busbar is the boss, the boss exceeds certain height, and connect with the contact of negative pole shell, set up insulating blocking body in the periphery of boss simultaneously, insulating blocking body's thickness slightly is less than the height that the boss exceeds, the clearance that the part that the boss exceeds produced, can hold insulating blocking body, if the boss burns out because of the short circuit, insulating blocking body plays a role, the direct contact of separation roll core and shell, form and open circuit, the further development of short circuit has been blocked, the security of battery has been improved.

Furthermore, the insulation blocking body is made of insulation rubber or insulation plastic, and the insulation blocking body is attached to the surface of the negative bus bar. The insulating blocking body is made of an insulating material with good durability, can take effect for a long time in a closed environment of the battery, and can effectively block.

Further, the height of the boss is 1-5 mm, and the thickness of the insulating blocking body is 0.5-1mm smaller than the height of the boss. The part that the boss exceeds can effectively improve the effect of contact, and insulating blocking body's thickness is less, can make things convenient for the boss to weld, improves production efficiency.

Furthermore, the shell is made of steel materials through integral punch forming, the thickness of the shell is uniform, and the inner surface of the shell is smooth and free of burrs. The steel shell material has good strength, good integrally formed tightness and smooth inside, and is convenient for filling a roll core.

Furthermore, the negative electrode bus bar is of a rectangular sheet structure, the length direction of the negative electrode bus bar is matched with the diameter of the winding core, a boss is formed in the middle of the negative electrode bus bar, and a plurality of connecting contacts are arranged on the negative electrode bus bar and connected with the winding core. The bus bar concentrates the connection point of the winding core on the bus bar, and is convenient to weld with the shell, so that the connection efficiency is improved.

Compared with the prior art, the utility model, have following advantage and effect: the design is a structural improvement for realizing the protection effect of a cylindrical lithium iron phosphate battery during short circuit, and solves the problem that the battery is damaged due to internal short circuit when the external short circuit occurs, and the battery has the advantages of high safety, good blocking effect and reduction of power consumption risk, is particularly suitable for application in a battery pack, blocks the single battery when the single battery fails, avoids the influence of high temperature on normal work of other batteries, improves safety, prolongs the service life of the whole battery, and has better reliability.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. the shell, 2, the cap, 3, roll core, 4, negative pole busbar, 5, contact boss, 6, insulation blocking body.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

The utility model provides a structure is blocked to cylinder type lithium cell negative pole short circuit safety, cylindrical lithium cell structure is including shell 1, block 2, roll up core 3 and negative bus bar 4, 1 shaping of shell is cylindrical structure, roll up core 3 and install in shell 1 according to the positive negative pole direction packing that corresponds, it is provided with negative bus bar 4 to connect at the negative pole of rolling up core 3, the shaping has contact boss 5 on negative bus bar 4, contact boss 5 is higher than negative bus bar 4's surface, and be close to the setting to negative shell 1, the shaping has smooth holding surface on the negative bus bar 4 of the side of contact boss 5, the fixed insulation that is provided with on the holding surface hinders body 6, insulation hinders body 6 is flat structure, and the plane is fixed on the holding surface, insulation hinders the thickness of body 6 and is less than contact boss 5's relative height, it keeps apart and sets up in the clearance between negative bus bar 4 and the 1 negative pole of shell.

The insulation blocking body 6 is made of insulation rubber or insulation plastic, and the insulation blocking body 6 is attached to the surface of the negative bus bar 4.

The height of the boss is 1-5 mm, and the thickness of the insulating blocking body 6 is 0.5-1mm smaller than the height of the boss.

The shell 1 is the integrative stamping forming of steel material, and the thickness of shell 1 is even unanimous, and its inside surface is smooth no burr.

Negative pole busbar 4 is the sheet structure of rectangle, and its length direction sets up with the diameter cooperation of rolling up core 3, has the boss at the middle part shaping of negative pole busbar 4, has a plurality of connecting contacts on negative pole busbar 4 to be connected with rolling up core 3.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that the present invention be considered in all respects as illustrative and not restrictive, and that the scope of the present invention is defined by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only one independent technical solution, and such description is given for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims (5)

1. The utility model provides a structure is blocked to cylinder type lithium cell negative pole short circuit safety which characterized in that: the cylindrical lithium battery structure comprises a shell (1), a cover cap (2), a winding core (3) and a negative electrode bus bar (4), wherein the shell (1) is formed into a cylindrical structure, the winding core (3) is filled and installed in the shell (1) according to the corresponding positive and negative electrode directions, the negative electrode of the winding core (3) is connected and provided with the negative electrode bus bar (4), a contact boss (5) is formed on the negative electrode bus bar (4), the contact boss (5) is higher than the surface of the negative electrode bus bar (4) and is close to the negative electrode shell (1), a smooth supporting surface is formed on the negative electrode bus bar (4) on the side edge of the contact boss (5), an insulation blocking body (6) is fixedly arranged on the supporting surface, the insulation blocking body (6) is of a flat structure and is fixed on the supporting surface in a plane, the thickness of the insulation blocking body (6) is smaller than the relative height of the contact boss (5), and the insulation blocking body is isolated and arranged in the gap between the negative electrode of the negative electrode bus bar (4) and the shell (1).

2. The structure of claim 1, wherein the negative electrode of the cylindrical lithium battery is electrically connected to the positive electrode of the lithium battery, and comprises: the insulation blocking body (6) is made of insulation rubber or insulation plastic, and the insulation blocking body (6) is attached to the surface of the negative electrode bus bar (4).

3. The structure of claim 1, wherein the negative electrode of the cylindrical lithium battery has a short circuit safety blocking structure, and the structure comprises: the height of the boss is 1 to 5mm, and the thickness of the insulating blocking body (6) is 0.5 to 1mm smaller than the height of the boss.

4. The structure of claim 1, wherein the negative electrode of the cylindrical lithium battery is electrically connected to the positive electrode of the lithium battery, and comprises: the shell (1) is made of steel materials and is formed in an integrated stamping mode, the thickness of the shell (1) is uniform, and the inner surface of the shell is smooth and free of burrs.

5. The structure of claim 1, wherein the negative electrode of the cylindrical lithium battery is electrically connected to the positive electrode of the lithium battery, and comprises: the negative electrode bus bar (4) is of a rectangular sheet structure, the length direction of the negative electrode bus bar is matched with the diameter of the winding core (3), a boss is formed in the middle of the negative electrode bus bar (4), and a plurality of connecting contacts are arranged on the negative electrode bus bar (4) and connected with the winding core (3).

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