CN201966164U - Fuse and lithium-ion secondary battery having same - Google Patents

Abstract

The utility model relates to a lithium ion battery technical field refers in particular to fuse and lithium ion secondary battery who has this fuse, the utility model discloses a fuse is including the fuse component that the material is conducting material, the upper cover that the material is insulating material, the lower cover that the material is insulating material, upper cover equipment is connected on the lower cover, fuse component clamp is fixed between upper cover and lower cover, upper cover and lower cover play the insulating action to the fuse component, protect the fuse component not receive external impact or vibration and be destroyed, in addition the utility model discloses an upper cover and lower cover equipment are fixed fuse component clamp and are formed assembled fuse, simple structure, and the equipment is convenient, has simplified production technology; the lithium ion secondary battery with the fuse adopts an assembled fuse, so that the battery core and the fuse element can be connected in a resistance welding, laser welding, ultrasonic welding or tin soldering mode, and the lithium ion secondary battery is convenient to assemble and reliable in performance.

Description

Fuse and lithium-ion secondary battery having same

Technical field:

The utility model relates to the technical field of lithium ion batteries, in particular to a fuse and a lithium ion secondary battery with the fuse.

Background technique:

At present, secondary batteries are widely used in various fields, and the world is advocating "low-carbon" life, which also promotes the rapid development of electric vehicles and electric bicycles. The batteries currently used in electric vehicles and electric bicycles include a series of batteries such as lithium-ion batteries, nickel-metal hydride batteries, and lead-acid batteries. These batteries can be collectively referred to as power batteries.

Because the power battery releases a large current when it is working, it is relatively dangerous. Once a short circuit occurs, it will cause safety accidents such as combustion and explosion. Therefore, it is very necessary to develop a suitable fuse to cut off the unsafe current in a timely and effective manner.

At present, the solder wires of many fuses are tin-plated materials, so tin soldering is recommended. However, soldering has many defects. For example, during mass production, the melting point of solder paste is generally above 200 degrees, and such a high temperature will directly affect the electrochemical performance of the battery and cause problems such as distortion of the appearance of the battery. Once the solder paste is impure, it is easy to cause the solder joints to fall off. In addition, tinned materials are not suitable for ultrasonic welding. Therefore, ordinary patch fuses and fuses with copper wires or tin wires at both ends cannot meet the demand.

There are currently some fuses in the form of welded assemblies. With the chip fuse as the main body, it is welded with the battery through welding adapters, such as copper, aluminum, nickel and other material adapters. Although such a fuse can meet performance requirements, the production process is complicated and the cost is high.

Utility model content:

The purpose of the utility model is to provide a fuse with simple structure, convenient installation and simplified production process for the deficiencies of the prior art, and also provide a lithium-ion secondary battery with the fuse.

In order to achieve the above object, the technical solution adopted by the utility model is:

A fuse and a lithium ion secondary battery with the fuse include a fuse element made of a conductive material, an upper cover made of an insulating material, and a lower cover made of an insulating material. The upper cover is assembled and connected to the lower cover, and the fuse element clip Tightly fixed between the upper cover and the lower cover.

As an improvement of the fuse of the present invention, the material of the fuse element is metal material or semiconductor material or other conductive material, and the material of the upper cover and the lower cover is plastic, rubber or ceramic or other insulating materials.

As an improvement of the fuse of the utility model, the middle part of the fuse element forms a long and narrow melt part.

As an improvement of the fuse of the present invention, the aspect ratio of the melt part is greater than 2.

As an improvement of the fuse of the utility model, the upper end surface of the lower cover is provided with a slot corresponding to the melt part, the melt part of the fuse element is clamped in the slot, and the lower end surface of the upper cover and the melt A cavity is opened at the position corresponding to the part.

As an improvement of the fuse of the utility model, the upper cover and the lower cover are assembled and connected by means of screw connection, welding, glue connection or buckle connection.

As an improvement of the fuse of the utility model, the upper cover and the lower cover are integrally injection molded together with the fuse element by means of injection molding.

The utility model also discloses a lithium ion secondary battery with the above-mentioned fuse, which includes a bracket, a plurality of battery cells fixed in the bracket, a conductive sheet, a conductive connecting sheet and a plurality of fuses connected in series with the battery cells, and the fuse includes The fuse element is made of conductive material, the upper cover is made of insulating material, and the lower cover is made of insulating material. The upper cover is assembled and connected to the lower cover, and the fuse element is clamped and fixed between the upper cover and the lower cover. One end of the fuse element It is welded with the electric core, and its other end is welded with the conductive sheet, and the two ends of the conductive connecting sheet are respectively welded with the conductive sheet and the electric core.

As an improvement of the lithium-ion secondary battery of the present invention, the support is a rigid body structure made of plastic, rubber, ceramics or metal, and the material of the conductive sheet is metal or semiconductor.

As an improvement of the lithium-ion secondary battery of the utility model, the fuse element and the battery cell are connected by means of resistance welding, laser welding, ultrasonic welding or soldering.

The beneficial effect of the utility model is that: the fuse of the utility model includes a fuse element made of a conductive material, an upper cover made of an insulating material, and a lower cover made of an insulating material. The upper cover is assembled and connected to the lower cover, and the fuse element is clamped. It is fixed between the upper cover and the lower cover. The upper cover and the lower cover play an insulating role on the fuse element and protect the fuse element from being damaged by external impact or vibration. In addition, the utility model assembles the fuse element through the upper cover and the lower cover. The components are clamped and fixed to form an assembled fuse, which has a simple structure, is convenient to assemble, simplifies the production process, and has low cost; the lithium-ion secondary battery with this fuse adopts an assembled fuse, which enables resistance welding, It is connected by laser welding, ultrasonic welding or soldering, and it is easy to assemble and reliable in performance.

Description of drawings:

Fig. 1 is a structural representation of the utility model fuse.

Fig. 2 is a sectional view of the utility model fuse.

Fig. 3 is a disassembled diagram of the fuse of the utility model.

FIG. 4 is a schematic structural diagram of a lithium-ion secondary battery with a fuse in the present invention.

Detailed ways:

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

Please refer to shown in Figures 1 to 3, the utility model fuse 1 includes a fuse element 11 made of a conductive material, an upper cover 12 of an insulating material, and a lower cover 13 of an insulating material, and the fuse element 11 is made of a metal material Or semiconductor materials or other conductive materials, the material of the upper cover 12 and the lower cover 13 is plastic, rubber or ceramics or other insulating materials. The upper cover 12 is assembled and connected to the lower cover 13 , and the fuse element 11 is clamped and fixed between the upper cover 12 and the lower cover 13 . During installation, the fuse element 11 and the lower cover 13 are fixed first, then the upper cover 12 and the lower cover 13 are positioned with a clamp, and finally the upper cover 12 and the lower cover 13 are welded by ultrasonic welding. Of course, the upper cover 12 and the lower cover 13 can also be assembled and connected by screwing, welding, gluing or buckling, and the upper cover 12 and the lower cover 13 can also be assembled together with the fuse element 11 by injection molding. Integral injection molding. For example, the upper cover 12 and the lower cover 13 are designed with a buckle structure, and the upper cover 12 and the lower cover 13 are connected through the buckle; or the method of adding glue is used to glue the upper cover 12 and the lower cover 13 together, and the The types can be 502 glue, UV glue, etc. The upper cover 12 and the lower cover 13 insulate the fuse element 11 and protect the fuse element 11 from being damaged by external impact or vibration. In addition, the utility model clamps the fuse element 11 by assembling the upper cover 12 and the lower cover 13 Fixed to form an assembled fuse 1, the structure is simple, the assembly is convenient, and the production process is simplified.

The middle part of the fuse element 11 forms an elongated melting portion 111 . The length-to-width ratio of the melt portion 111 is 3, which has better fusing performance. The upper end surface of the lower cover 13 is provided with a draw-in groove 131 corresponding to the melt part 111, and the melt part 111 of the fuse element 11 is stuck in the draw-in groove 131, which is easy to install and has a stable structure after installation. A cavity 121 is defined at a position corresponding to the melt portion 111 .

Please refer to Fig. 4, the lithium-ion secondary battery with the above-mentioned fuse 1 includes a bracket 2, a plurality of battery cells 3 fixed in the bracket 2, a conductive sheet 4, a conductive connecting sheet 5 and a plurality of battery cells 3 The fuse 1 connected in series, the bracket 2 is a rigid body structure made of plastic, rubber, ceramics or metal, the conductive sheet 4 and the conductive connecting sheet 5 are made of metal or semiconductor, one end of the fuse element 11 is welded to the electric core 3, and the other end is connected to the electric core 3. The conductive sheet 4 is welded, and the two ends of the conductive connecting sheet 5 are welded to the conductive sheet 4 and the electric core 3 respectively. The fuse element 11 and the battery cell 3 are connected by means of resistance welding, laser welding, ultrasonic welding or soldering.

The lithium-ion secondary battery of the utility model adopts an assembled fuse 1, so that the electric core 3 and the fuse element 11 can be connected by resistance welding, laser welding, ultrasonic welding or soldering, and the assembly is convenient and the performance is reliable.

Take the internal short circuit of 18650 cell 3 as an example. The fuse 1 is connected in series with the 18650 cell 3, and the cell 3 has an internal short circuit. When the current passing through the fuse 1 reaches 50A, the fuse 1 can be disconnected within 0.05s, thus effectively ensuring the safety of the entire battery pack. .

Taking 18650 cell 3 as an example, the details of the assembly process of this secondary battery pack are as follows:

First place the single cells 3 into the battery bracket 2 one by one. The bracket 2 is assembled from upper and lower parts. The assembly method can be screw connection, buckle connection, glue connection, welding and other methods. The battery holder 2 mechanically fixes the battery cell 3 . Assembling the conductive sheet 4 on the battery bracket 2 can be fixed by means of screw connection, snap connection, glue connection, welding and the like. The assembled fuse 1 is connected in series with a single cell 3 . First weld one end of the assembled fuse 1 to the conductive sheet 4, and weld the other end to the positive or negative electrode of the battery; then weld one end of the conductive connecting sheet 5 to the conductive sheet 4, and the other end of the conductive connecting sheet 5 to the The battery cell 3 is welded; finally, the protective plate 6 is installed on the battery support 2, and its fixing method can be screw connection, glue connection, welding and other methods.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also make appropriate changes and modifications to the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (10)

1. The fuse is characterized in that it includes a fuse element made of conductive material, an upper cover made of insulating material, and a lower cover made of insulating material. The upper cover is assembled and connected to the lower cover, and the fuse element is clamped and fixed on the upper cover. between the lower cover. 2. The fuse according to claim 1, wherein the fuse element is made of metal or semiconductor material, and the upper and lower covers are made of plastic, rubber or ceramics. 3. The fuse according to claim 1, characterized in that: the middle part of the fuse element forms a narrow and long melting part. 4. The fuse according to claim 3, characterized in that: the length-to-width ratio of the melt portion is greater than 2. 5. The fuse according to claim 4, characterized in that: the upper end surface of the lower cover is provided with a slot corresponding to the melt part, the melt part of the fuse element is clamped in the slot, and the upper cover A cavity is opened at the position corresponding to the melting portion on the lower end surface. 6. The fuse according to claim 1, characterized in that: the upper cover and the lower cover are assembled and connected by means of screw connection, welding, glue connection or buckle connection. 7. The fuse according to claim 1, characterized in that: the upper cover and the lower cover are integrally injection molded together with the fuse element by means of injection molding. 8. The lithium-ion secondary battery with the fuse described in any one of claims 1 to 7, comprising a support, a plurality of electric cores fixed in the support, a conductive sheet, a conductive connecting sheet, and a plurality of batteries connected in series with the electric core The fuse is characterized in that: the fuse includes a fuse element made of conductive material, an upper cover made of insulating material, and a lower cover made of insulating material. The upper cover is assembled and connected to the lower cover, and the fuse element is clamped and fixed on the upper cover. Between the cover and the lower cover, one end of the fuse element is welded to the electric core, the other end is welded to the conductive sheet, and the two ends of the conductive connecting sheet are respectively welded to the conductive sheet and the electric core. the 9 . The lithium-ion secondary battery according to claim 8 , wherein the support is a rigid body structure made of plastic, rubber, ceramic or metal, and the conductive sheet is made of metal or semiconductor. 10 . The lithium ion secondary battery according to claim 8 , wherein the fuse element is connected to the battery cell by means of resistance welding, laser welding, ultrasonic welding or soldering. 11 . the

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