Reusable thermistor overcurrent protection device and application in battery module

A technology of overcurrent protection and thermistor, applied in the direction of current response resistors, battery components, circuits, etc., can solve the problem of low safety factor of large-capacity battery modules

Inactive Publication Date: 2012-01-11
BEIJING SHENZHOU YUANWANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcoming of low safety factor of large-capacity battery modules, the present invention provides a busbar device with thermistor function that can be used in battery modules

Method used

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  • Reusable thermistor overcurrent protection device and application in battery module
  • Reusable thermistor overcurrent protection device and application in battery module
  • Reusable thermistor overcurrent protection device and application in battery module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: figure 1 It is a schematic diagram of the structure of the busbar device with the function and characteristics of the thermistor, such as figure 1 As shown in the embodiment, the device includes:

[0022] Two copper plates, upper plate A and lower plate B, each with a thickness of 2.5mm, polymer PTC film with a thickness of 0.3mm, a Curie temperature of 85°C, and a lift-to-drag ratio of not less than 10 4 , provided by Shanghai Kete Co., Ltd. Plates A and B, PTC film have 2 threaded through holes. The shape of the upper and lower plates is 20*250*2.5mm (W*L*H), the shape of the PTC film is 20*250*0.3mm (W*L*H), and the hole diameter of the corner thread is 4mm.

[0023] The polymeric PTC film is placed between two metal plates, and the two plates are aligned with the four sides of the PTC film and the four holes. Keep the position fixed, place it on the lower plate of the hot press, and set two press travel positioning blocks on the plate of the hot press...

Embodiment 2

[0026] Two copper plates, upper plate A and lower plate B, each with a thickness of 3mm, polymer PTC film with a thickness of 0.3mm, a Curie temperature of 90°C, and a lift-to-drag ratio of not less than 10 4 , provided by Shanghai Kete Co., Ltd. Plates A and B, PTC film have 4 threaded through holes. The shape of the upper plate is 100*100*3mm (W*L*H), the shape of the PTC film is 100*100*0.3mm (W*L*H), and the diameter of the threaded hole is 6mm.

[0027] The polymeric PTC film is placed between two metal plates, and the two plates are aligned with the four sides of the PTC film and the four holes. Keep the position fixed, place it on the lower plate of the hot press, and set two press stroke positioning blocks on the plate of the hot press, so that the overall thickness of the three-layer composite is not less than 6.25mm after the press is pressed. Heat to 125°C on a hot press, and set the pressure to 3500Pa. After the temperature is reached, start to pressurize and ke...

Embodiment 3

[0030] Two copper plates, upper plate A and lower plate B, each with a thickness of 4mm, polymer PTC film with a thickness of 0.3mm, a Curie temperature of 85°C, and a lift-to-drag ratio of not less than 10 4 , provided by Shanghai Kete Co., Ltd. Plates A and B, PTC film have 4 threaded through holes and have 20 12 diameter through holes. The shape of the upper and lower plates is 300*300*4mm (W*L*H), the shape of the PTC film is 300*300*0.3mm (W*L*H), and the diameter of the threaded hole is 8mm.

[0031] The polymeric PTC film is placed between two metal plates, and the two plates are aligned with the four sides of the PTC film and the four holes. Keep the position fixed, place it on the lower plate of the hot press, and set two press travel positioning blocks on the plate of the hot press, so that the overall thickness of the three-layer composite is not less than 8.25mm after the press is pressed. Heat to 135°C on a hot press, and set the pressure to 4000Pa. After the t...

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Abstract

The invention relates to a reusable high-current allowable thermistor device and an application in a battery module thereof. The device has a three-layer composite plate structure; the interlayer is a polymer PTC film; the two sides are copper or aluminium plates with good conductivity; and the film and the plates are combined to form an integral body by hot pressing technology. The plates and the film has a plurality of through holes with identical hole diameters and positions; after combination, the upper and the lower metal plates are drilled through by insulating screws, and are locked and fixed by nuts. The device is used as a bus bar in a battery module; the lower part is connected to a battery tab or a plate led out by the tab; the metal plate at the upper part leads out a positive and a negative pole. The device is normally used as a bus bar when the temperature is below a Curie temperature point; when the input or output current is greatly increased suddenly due to external short circuit of the battery module or other accidents, the device temperature is higher than the Curie temperature point, and the resistance is increased by 1000 times at the most; and thus the security and the reliability are effectively guaranteed.

Description

Technical field: [0001] The invention relates to the battery field, in particular to a large-capacity battery module thermistor overcurrent protection device. Background technique: [0002] At present, the field of energy storage and vehicle power has become a new market for lithium-ion batteries. With the expansion of the application field of lithium-ion batteries, lithium-ion battery cells and modules gradually develop from small capacity and small scale to large capacity and large scale, and the capacity of single cells develops from less than 5 ampere hours to more than 100 ampere hours , The scale of battery use has also developed from a few batteries connected in series and parallel to thousands of batteries connected in series and parallel. The application of large-capacity and large-scale lithium-ion batteries has brought new development opportunities for lithium-ion batteries, and at the same time puts forward higher requirements for the safety and reliability of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/20H01C7/13
CPCY02E60/10
Inventor 要智勇郑存卫关桂龙
Owner BEIJING SHENZHOU YUANWANG TECH
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