WO2021056822A1

WO2021056822A1 - Circuit breaker pin sheet, circuit breaker and electrochemical apparatus

Info

Publication number: WO2021056822A1
Application number: PCT/CN2019/123030
Authority: WO
Inventors: 稻福哲也; 邱实; 蒋峥; 李松
Original assignee: 苏州聚天合金属科技有限公司
Priority date: 2019-09-26
Filing date: 2019-12-04
Publication date: 2021-04-01
Also published as: CN110634715A

Abstract

Disclosed are a circuit breaker pin sheet, a circuit breaker and an electrochemical apparatus, which relate to the field of circuit breakers. The problem that existing pin sheets made of a nickel material increase the resistance value and decrease current, thus making a working temperature of the circuit breaker rise and reducing the functions thereof is solved. The key point of the technical solution comprises a base body; a surface of the base body is provided with a nickel-plated layer; and a material of the base body is copper or a copper alloy. The present invention achieves the effects of increasing current capacity, reducing the impedance value and improving safety.

Description

Circuit breaker pin piece, circuit breaker and electrochemical device

Technical field

The invention relates to the field of circuit breakers, and more specifically, it relates to a circuit breaker pin piece, a circuit breaker and an electrochemical device.

Background technique

The breaker is a miniature resettable temperature protection device, which directly focuses on temperature. When the temperature reaches the temperature value set by the specification, it immediately performs temperature protection action, and the contact switch is switched to open to prevent Cut off the current, thereby improving safety. After the temperature returns to normal, the contact is disconnected and switched to contact, and electrical connection is realized again.

The circuit breaker includes two connecting ends, the material of which is copper alloy, and the positive electrode material connected to the cell is aluminum, which cannot be directly welded to the connecting end. Therefore, it is necessary to weld the lead piece on the connecting end, and the lead piece is connected to the positive electrode. The electrode is connected, and the material of the pin piece is nickel (NI).

However, after spot welding the connection end of the Breaker and the lead sheet, the resistance value will increase and the current will decrease compared with the case of no spot welding, which will cause the working temperature of the Breaker to rise and reduce its function; For the group of products, the resistance value increased by about 3 times during the test, the current dropped by about 50%, and the temperature of the Breaker itself increased to about 90°C.

Summary of the invention

In view of the deficiencies in the prior art, one of the objectives of the present invention is to provide a circuit breaker pin piece, which has the advantages of being able to increase the current capacity, reduce the impedance value and improve the safety.

In order to achieve the above objective, the present invention provides the following technical solutions:

A circuit breaker pin piece includes a substrate, a nickel-plated layer is arranged on the surface of the substrate, and the material of the substrate is copper or a copper alloy.

Further, the copper alloy includes copper and silver.

Further, the copper alloy includes copper and aluminum.

One of the objectives of the present invention is to provide a circuit breaker, which includes a first connection end and a second connection end, and the material composition of the first connection end and/or the second connection end is the same as the material composition of the above-mentioned circuit breaker pin piece. the same.

One of the objectives of the present invention is to provide a circuit breaker, which includes a first connection end and a second connection end, and the first connection end and/or the second connection end are respectively provided with the above-mentioned circuit breaker pin pieces.

Further, the circuit breaker pin piece and the first connection end or the second connection end are fixed by welding.

Another object of the present invention is to provide an electrochemical device, which includes the circuit breaker described in the above technical solution.

In summary, the present invention has the following beneficial effects:

The present invention improves the material of the lead piece. The traditional material is nickel, while the present invention is copper nickel plating or copper alloy nickel plating, which can increase the current capacity, reduce the impedance value and improve the safety; and the use of NI in the background art Compared with the breaker of the material, the current can be increased by more than 1.5 times, the impedance value can be greatly reduced (about 40% or more), and the working temperature of the Breaker can be reduced from about 90 to 77 degrees, thereby improving safety; In the field of Breaker technology, it is common knowledge to use NI materials for lead sheets, and no other alternative materials have appeared. Those skilled in the art have not thought of improving the material of lead sheets, and the present invention can produce unexpected technical effects. To a certain extent, it also overcomes technical prejudice.

The technical solution of the present invention is not only applied to circuit breakers on notebook and mobile phone batteries, but also to connecting pieces on battery modules, connecting pieces on power tools, and module connecting pieces on new energy battery components.

Description of the drawings

Figure 1 is a cross-sectional view of a circuit breaker pin piece in embodiment 1;

Figure 2 is a schematic diagram of the structure of the circuit breaker in Embodiment 2;

Fig. 3 is a current-temperature curve diagram of the X77-1 type Breaker in Example 2 using new materials and old materials respectively;

Figure 4 is the current-temperature curve diagram of the Z90-6 type Breaker in Example 2 using new materials and old materials respectively;

Figure 5 is a schematic diagram of the structure of the circuit breaker in Embodiment 3;

6 is a schematic diagram of the structure of the electrochemical device in Embodiment 4;

FIG. 7 is a schematic diagram of the structure of the electrochemical device in Example 5. FIG.

In the figure: 1. Circuit breaker body; 11. First connection terminal; 12. Second connection terminal; 2. Circuit breaker pin piece; 21. Substrate; 22. Nickel-plated layer; 3. Cell; 31. Positive electrode ; 32. Negative electrode.

detailed description

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

This specific embodiment is only an explanation of the present invention, and is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contribution as needed, but as long as the rights of the present invention The scope of the requirements is protected by the patent law.

Example 1:

A circuit breaker pin piece, referring to FIG. 1, includes a base 21, a nickel-plated layer 22 is provided on the surface of the base 21, and the material of the base 21 is copper or a copper alloy; the copper alloy may be a silver-copper alloy or an aluminum-copper alloy.

Example 2:

A circuit breaker, referring to Figure 2, which includes a circuit breaker body 1, respectively provided with a first connection end 11 and a second connection end 12, the first connection end 11 and/or the second connection end 12 The circuit breaker pin pieces 2 in embodiment 1 are respectively provided; in this embodiment, the circuit breaker pin pieces 2 are spot welded on the first connecting end 11 and the second connecting end 12, and the circuit breaker pin pieces 2 The shape is not limited to the elongated shape in the drawings, and may be other shapes such as an L shape.

In this example, 6 models of Breaker are selected, and the lead pieces of new and old materials are used. The test data are shown in Table 1 and Table 2, respectively, where "77" in the model "X77-1" represents the set temperature It is 77°C.

Table 1

型号model	X77-1X77-1	X90-2X90-2	Y77-3Y77-3	Y85-4Y85-4	Z77-5Z77-5	Z90-6Z90-6
NI材料(Ω)NI material (Ω)	8.78mΩ8.78mΩ	9.13mΩ9.13mΩ	8.98mΩ8.98mΩ	9.42mΩ9.42mΩ	8.46mΩ8.46mΩ	8.49mΩ8.49mΩ
60℃电流值60°C current value	4.46A4.46A	5.30A5.30A	4.21A4.21A	4.66A4.66A	4.28A4.28A	5.86A5.86A
70℃电流值70°C current value	3.17A3.17A	4.12A4.12A	3.02A3.02A	3.46A3.46A	1.88A1.88A	4.62A4.62A

Table 2

型号model	X77-1X77-1	X90-2X90-2	Y77-3Y77-3	Y85-4Y85-4	Z77-5Z77-5	Z90-6Z90-6
新材料(Ω)New material (Ω)	4.83mΩ4.83mΩ	4.49mΩ4.49mΩ	4.3mΩ4.3mΩ	4.64mΩ4.64mΩ	3.66mΩ3.66mΩ	3.63mΩ3.63mΩ
60℃电流值60°C current value	7.12A7.12A	8.58A8.58A	6.98A6.98A	7.84A7.84A	7.26A7.26A	10.34A10.34A
70℃电流值70°C current value	4.10A4.10A	6.65A6.65A	4.14A4.14A	5.64A5.64A	3.12A3.12A	8.08A8.08A

For X77-1 type Breaker, refer to Figure 3 for its current-temperature curve, and for Z90-6 type Breaker, refer to Figure 4 for its current-temperature curve.

Through the comparison of the data in Table 1 and Table 2, and the comparison of the curves in Fig. 1 and Fig. 2, it can be seen that the use of the lead piece of the new material in this embodiment can increase the current capacity and reduce the impedance value, thereby reducing the Breaker's working temperature, thereby improving safety; specific data can be seen, the amount of current can be increased by about 1.5 times or more, the impedance value can be greatly reduced (about 40% or more), so that the Breaker's working temperature from about 90 ℃ Reduce to 77°C.

Example 3:

A circuit breaker, referring to FIG. 5, which includes a circuit breaker body 1. The circuit breaker body 1 is provided with a first connection end 11 and a second connection end 12 respectively. In this embodiment, the first connection end 11 and the second connection end The material of 12 is the same as that of the circuit breaker pin sheet in embodiment 1, that is, the copper surface is nickel-plated or the copper alloy surface is nickel-plated; at the same time, the first connection end 11 and the second connection end 12 can replace the connection in the embodiment 2. The combined structure of the terminal and the lead piece is directly used for welding with the positive electrode of the battery, and its shape and size can be processed as required, which can save welding procedures and processing costs.

Example 4:

An electrochemical device, referring to Figure 6, which includes a battery core 3 and a circuit breaker, the battery core 3 is provided with a positive electrode 31 and a negative electrode 32; the circuit breaker includes a first connection end 11 and a second connection end 12, the first The connecting end 11 and the second connecting end 12 are respectively spot-welded with circuit breaker pin pieces 2. In this embodiment, the circuit breaker pin piece 2 connected to the first connecting end 11 is connected to the positive electrode 31.

Example 5:

An electrochemical device, referring to FIG. 7, based on Embodiment 4. The difference between this embodiment and Embodiment 4 is that the circuit breaker in this embodiment is provided with a first connection terminal 11 and a second connection terminal 12, respectively. The first connecting end 11 is directly connected to the positive electrode 31 of the cell 3; the material composition of the first connecting end 11 and the second connecting end 12 is the same as that of the circuit breaker pin sheet in Example 1, that is, the copper surface is nickel-plated Or the surface of copper alloy is plated with nickel.

Claims

A circuit breaker pin sheet is characterized in that it comprises a base body, the surface of the base body is provided with a nickel-plated layer, and the material of the base body is copper or copper alloy.
The circuit breaker pin sheet according to claim 1, wherein the copper alloy includes copper and silver.
The circuit breaker pin sheet according to claim 1, wherein the copper alloy includes copper and aluminum.
A circuit breaker, characterized in that it comprises a first connection end and a second connection end, and the material composition of the first connection end and/or the second connection end is the same as the material composition of the circuit breaker pin sheet in claim 1. the same.
A circuit breaker, characterized in that it comprises a first connection end and a second connection end, and the first connection end and/or the second connection end are respectively provided with the circuit breaker pin piece according to claim 1.
The circuit breaker according to claim 5, wherein the circuit breaker pin piece and the first connection end or the second connection end are fixed by welding.
An electrochemical device, characterized by comprising the circuit breaker according to any one of claims 4-6.