阅读说明：本技术 一种大电流断电装置及锂离子电池 (Heavy current power-off device and lithium ion battery ) 是由 郑见杰 王炜娜 杜园 于 2019-10-17 设计创作，主要内容包括：本发明涉及一种大电流断电装置及锂离子电池,属于电源技术领域,其特征在于,所述大电流断电装置至少包括：连接极耳的开路器；所述开路器上开设有凹痕；支撑于开路器下表面的支撑环；所述支撑环位于电池底盖的上表面；其中：所述开路器的中间部位向下弯曲,且中间部位的下表面与电池底盖的上表面固定连接,所述凹痕位于开路器的下表面,所述开路器上固定有连接极耳用的焊接片,所述支撑环的材质为绝缘材料,所述绝缘材料为聚丙烯塑料或聚酰亚胺或玻璃或陶瓷。本发明针对大容量电池电池在极端滥用条件下,使得锂离子电池自动开路,防止锂离子电池发生热失控,提升锂离子电池的可靠性。(The invention relates to a high-current power-off device and a lithium ion battery, belonging to the technical field of power supplies and characterized in that the high-current power-off device at least comprises: a circuit breaker for connecting the tabs; the opening device is provided with a dent; the supporting ring is supported on the lower surface of the circuit breaker; the support ring is positioned on the upper surface of the battery bottom cover; wherein: the middle part of the opener is bent downwards, the lower surface of the middle part of the opener is fixedly connected with the upper surface of the battery bottom cover, the dent is located on the lower surface of the opener, a welding sheet for connecting the tabs is fixed on the opener, the support ring is made of an insulating material, and the insulating material is polypropylene plastic or polyimide or glass or ceramic. The invention aims at automatically opening the lithium ion battery under the extreme abuse condition of the high-capacity battery, prevents the lithium ion battery from generating thermal runaway, and improves the reliability of the lithium ion battery.)

1. A high current power cutoff device, comprising at least:

a circuit breaker (3) for connecting the tabs (4); the opening device (3) is provided with a dent;

a support ring (2) supported on the lower surface of the circuit breaker (3); the support ring (2) is positioned on the upper surface of the battery bottom cover (1); wherein:

the middle part of the opener (3) is bent downwards, and the lower surface of the middle part is fixedly connected with the upper surface of the battery bottom cover (1).

2. A high current power cut-off device according to claim 1, wherein the indentation is located on the lower or upper surface of the circuit breaker (3).

3. A high current power cut-off device according to claim 1, characterized in that a welding tab (5) for connecting the tab (4) is fixed to the circuit breaker (3).

4. A high current power cut-off device according to claim 1, wherein the material of the support ring (2) is an insulating material.

5. A high current power down device according to claim 3 wherein the insulating material is polypropylene plastic or polyimide or ceramic or glass.

6. A high current power cut-off device according to any one of claims 1 to 5, wherein the material of the circuit breaker (3) is aluminum or aluminum alloy.

7. A lithium ion battery comprising a high current disconnect device of any of claims 1-5 and a battery.

8. The lithium ion battery of claim 7, wherein: the battery is cylindrical or square.

Technical Field

The invention belongs to the technical field of power supplies, and particularly relates to a high-current power-off device and a lithium ion battery.

Background

The lithium ion battery is widely applied by virtue of the characteristics of high energy density and long cycle life, but the lithium ion battery can be overheated under the condition of extreme abuse, and finally exceeds the safe use temperature of the lithium ion battery, so that the spontaneous exothermic reaction of the lithium ion battery is caused, and finally the thermal runaway of the lithium ion battery, the risks of fire, explosion and the like are caused.

In order to reduce the safety risk of the lithium ion battery in the use process, the battery open circuit device is a common safety measure, the most common open circuit device is the open circuit device in the upper cover of the 18650 battery, when the 18650 battery has the problems of overcharge, short circuit and the like, the air pressure in the battery is quickly increased and exceeds the pressure bearing capacity of the open circuit device, the disconnecting device deforms, the electrical connection is disconnected, and the battery stops working, so that the lithium ion battery is prevented from continuously reacting to generate thermal runaway, and the safety of the lithium ion battery is improved.

However, the current open circuit devices of most batteries are integrated in the battery cap, and the overcurrent capacity of the open circuit device is generally poor in order to meet the requirement of the open circuit device to operate under proper pressure due to size limitation, and the open circuit device can only meet the operating current requirements of small-capacity batteries such as 18650 and 21700. However, in recent years, with the rapid development of power batteries, the capacity of a single battery is continuously increased, the capacity of a part of single batteries breaks through 150Ah, even the capacity of a part of single batteries exceeds 200Ah, and the traditional open-circuit device cannot meet the operating current requirement of a large-capacity lithium ion battery.

Disclosure of Invention

The invention provides a high-current power-off device and a lithium ion battery for solving the technical problems in the prior art, aiming at automatically opening a circuit of the lithium ion battery under the extreme abuse condition of a high-capacity battery, preventing the lithium ion battery from thermal runaway and improving the reliability of the lithium ion battery.

A first object of the present invention is to provide a high current power cutoff device, at least comprising:

a circuit breaker (3) for connecting the tabs (4); the opening device (3) is provided with a dent;

a support ring (2) supported on the lower surface of the circuit breaker (3); the support ring (2) is positioned on the upper surface of the battery bottom cover (1); wherein:

the middle part of the opener (3) is bent downwards, and the lower surface of the middle part is fixedly connected with the upper surface of the battery bottom cover (1).

Further, the dent is positioned on the lower surface or the upper surface of the circuit breaker (3).

Furthermore, a welding piece (5) for connecting the tabs (4) is fixed on the circuit breaker (3).

Furthermore, the support ring (2) is made of an insulating material.

Further, the insulating material is polypropylene plastic or polyimide or ceramic or glass.

Furthermore, the material of the circuit breaker (3) is aluminum or aluminum alloy.

The second purpose of the invention is to provide a lithium ion battery, which comprises the high-current power-off device and the battery.

Further: the battery is cylindrical or square.

The invention has the advantages and positive effects that:

1. the design of the circuit breaker is integrated on the battery bottom cover, so that the size of the circuit breaker is greatly improved, and the working current of the circuit breaker is effectively improved.

2. The bottom cover of the battery is deformed to cause open circuit, and the area of the bottom cover is far larger than that of the battery cap, so that the open circuit air pressure range is greatly narrowed, and the reliability of the open circuit device is improved.

3. The area of the battery bottom cover is large, so that the open circuit at low air pressure can be realized, and the safety of the lithium ion battery is improved.

Drawings

FIG. 1 is a block diagram of a first preferred embodiment of the present invention;

FIG. 2 is a block diagram of a second preferred embodiment of the present invention;

fig. 3 is a graph comparing experimental results of the preferred embodiment of the present invention with those of the conventional art.

Wherein: 1. a battery bottom cover; 2. a support ring; 3. opening a road device; 4. a tab; 5. and (6) welding the sheet.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

referring to fig. 1 to 3, a high current power-off device and a lithium ion battery include:

an open circuit device 3 for connecting the tabs 4; the opening device 3 is provided with a dent;

a support ring 2 supported on the lower surface of the circuit breaker 3; the support ring 2 is positioned on the upper surface of the battery bottom cover 1; wherein:

the middle part of the circuit breaker 3 is bent downwards, and the lower surface of the middle part is fixedly connected with the upper surface of the battery bottom cover 1. The circuit breaker 3 can be in a circular arc shape or an arc shape.

The indentation is located on the lower or upper surface of the shunt 3.

And a welding piece 5 for connecting the lug 4 is fixed on the circuit breaker 3.

The material of the support ring 2 is an insulating material, and the insulating material is preferably polypropylene plastic or polyimide or glass or ceramic.

The material of the circuit breaker 3 is aluminum or aluminum alloy.

A lithium ion battery comprises the high-current power-off device and a battery.

Further: the battery is cylindrical or square.

In the following examples and comparative examples, 18650 batteries were used.