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Internal pressure monitoring device for lithium ion batteries

A lithium-ion battery, internal pressure technology, used in secondary batteries, electric traction, battery/battery traction, etc., can solve problems such as low reliability, inability to meet high-precision monitoring of battery internal pressure, and complex causes of battery internal pressure. , to achieve the effect of high measurement accuracy

Pending Publication Date: 2018-09-21
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The causes of battery internal pressure are complex. At present, it is mainly limited by factors such as battery composition materials, manufacturing processes, and battery structure. Therefore, it is very necessary to accurately measure the internal pressure of batteries to provide key data for battery design.
[0003] In the prior art, there are many methods for measuring the internal pressure of the battery. One is to calculate the internal pressure of the battery through the deformation of the battery shell. Said that the reliability is very low; the other is to preset pressure-sensitive paper inside the battery, then dissect the battery, and compare the pressure-sensitive paper with the standard color card to obtain the internal pressure of the battery. This method has poor timeliness. Expansion has a great impact on the test results, so the reliability of the data is poor; another method is to change the battery structure and connect external sensors. This method increases the remaining volume of the battery and cannot reflect the pressure in the original space state. Therefore, the above methods Neither can meet the high-precision monitoring of the internal pressure of the battery

Method used

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  • Internal pressure monitoring device for lithium ion batteries
  • Internal pressure monitoring device for lithium ion batteries
  • Internal pressure monitoring device for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] as attached figure 1 As shown, the fixing component is arranged outside the battery and the monitoring component, including the device casing 4, the nut 5 and the compression ring 6; Connection, the end close to the negative pole of the battery is connected to the compression ring, and there are insulated wire channels on the shell of the device, the middle of the nut and the middle of the compression ring, which are used to set the insulated wires to facilitate the connection of the battery and sensor with external equipment . The device housing is used to fix and assemble the battery, the nut and compression ring are used to fix the battery and monitoring components in the device housing, and the tightness between the battery and the sensor is ensured by adjusting the tightness of the nut and compression ring . In order to ensure the tightness and stability of the connection between the nut and the compression ring and the device casing, the nut and the device casin...

Embodiment 2

[0038] as attached figure 2 As shown, the fixing component is arranged outside the battery and the monitoring component, including the device casing 4 and the nut 5; the device casing is a cavity structure with an opening near the positive end of the battery, a thread connected to the nut, and a closed cavity near the negative end of the battery; And the middle part of the nut, the casing of the device and the middle part of the casing close to the negative end of the battery are all provided with insulated wire channels for setting the insulated wires to facilitate the connection of the battery and the sensor with the external equipment. The device casing is used to fix and assemble the battery, and the nut is used to fix the battery and monitoring components in the device casing, and the tightness between the battery and the sensor is ensured by adjusting the tightness of the nut. In order to ensure the tightness and stability of the connection between the nut and the devic...

Embodiment 3

[0040] as attached image 3 As shown, the fixing component is arranged outside the battery and the monitoring component, including the device casing 4 and the compression ring 6; the device casing is an opening near the negative end of the battery, provided with threads to connect with the compression ring, and a closed cavity near the positive end of the battery structure; and the middle part of the compression ring, the device casing and the middle part of the casing near the positive end of the battery are all provided with insulated wire channels for setting insulated wires to facilitate the connection of the battery and sensors with external equipment. The device casing is used to fix and assemble the battery, and the compression ring is used to fix the battery and monitoring components in the device casing, and the tightness between the battery and the sensor is ensured by adjusting the tightness of the compression ring. In order to ensure the tightness and stability of ...

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Abstract

The invention discloses an internal pressure monitoring device for lithium ion batteries. The internal pressure monitoring device is characterized by comprising a monitoring assembly and a fixing assembly; the monitoring assembly comprises a sealing ring and a sensor, and the sealing ring and the sensor are sequentially arranged on a negative electrode of a battery; one end of the sealing ring with an 'H'-shaped section sleeves the negative electrode of the battery, and a pressure transition bin can be formed on the sealing ring after the other end of the sealing ring sleeves a side of a pressure sensing surface of the sensor. The internal pressure monitoring device for the lithium ion batteries has the advantages that the internal pressures of the battery can be monitored by the internalpressure monitoring device under various conditions in real time, and the internal pressure monitoring device can be reused and is free of lithium battery structural constraints and high in measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of battery performance and battery safety, and in particular relates to a lithium-ion battery internal pressure monitoring device. Background technique [0002] With the widespread application of lithium-ion batteries in new energy vehicles, their safety performance has attracted more and more attention. Due to the continuous improvement of battery capacity, the remaining space inside the battery is becoming smaller and smaller. When the battery is stored in a high-temperature environment, overcharged, overdischarged, and various abuse processes will generate gas, the accumulation of gas will increase the internal pressure of the battery. , causing the battery to short circuit or even explode. The causes of battery internal pressure are complex. At present, it is mainly limited by factors such as battery material, manufacturing process, and battery structure. Therefore, it is very necessary to accurately me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48H01M10/42H01M10/0525B60L11/18
CPCB60L50/64H01M10/0525H01M10/425H01M10/48Y02E60/10Y02T10/70
Inventor 李远宏肖斌
Owner SHENZHEN BAK POWER BATTERY CO LTD
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