Four-electrode lithium-ion battery and its potential measurement method

A lithium-ion battery and four-electrode technology, which is applied in electrostatic field measurement, secondary batteries, circuits, etc., can solve the problems of lithium metal consumption and dissolution, and short service life of measurement

Active Publication Date: 2021-06-25
创普斯(深圳)新能源科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-plated metal sheet (wire) has high measurement accuracy as a reference electrode. However, lithium metal will consume and dissolve under long-term work as a reference electrode, so that the use of this reference electrode The measuring system has a short measuring life

Method used

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  • Four-electrode lithium-ion battery and its potential measurement method
  • Four-electrode lithium-ion battery and its potential measurement method
  • Four-electrode lithium-ion battery and its potential measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1: Battery Assembly

[0071] refer to figure 2 , the positive and negative electrodes are alternately separated between the diaphragms, and the tabs are drawn on the same side. Through ultrasonic welding, the positive tabs are welded to the positive pole through the current collector, and the negative tabs are welded to the negative pole through the current collector; The auxiliary reference electrode and the main reference electrode (the same material as the positive electrode sheet) are respectively placed between the positive electrode sheet and the negative electrode sheet of different layers and are separated by a diaphragm (the auxiliary reference electrode diaphragm and the main reference electrode diaphragm), and are placed on the positive electrode The opposite side of the lug and the negative lug is the lug, and the auxiliary reference lug is welded to the auxiliary reference electrode through ultrasonic welding, and the main reference lug is welded t...

Embodiment 2

[0074] Example 2: Test Equipment Connection

[0075] Use the Xinwei test cabinet to test the cycle stability of the four-electrode battery, and use the Agilent tester to monitor the positive electrode-auxiliary reference electrode, negative electrode-auxiliary reference electrode, positive electrode-main reference electrode, negative electrode-main reference electrode, Auxiliary reference electrode-primary reference electrode potential change (wiring and description as figure 2 shown), the charge and discharge curves of the positive electrode, negative electrode, and full battery were obtained respectively. The range of test conditions is 25°C, 1C rate current charge and discharge.

[0076] The specific wiring of the Agilent tester is as follows: ①The high-voltage solid line of the main channel is connected to the main reference tab, and the low-voltage dotted line is connected to the auxiliary reference tab to monitor the potential difference between the two reference elect...

Embodiment 3

[0084] By measuring the potential of positive pole-auxiliary reference electrode, negative pole-auxiliary reference electrode, positive pole-main reference electrode and negative pole-main reference electrode of four-electrode lithium ion battery (obtained in embodiment 1), obtain as follows Image 6 The positive electrode, negative electrode, and full battery of the shown four-electrode lithium ion battery (obtained in Example 1) are charged and discharged curves fitted.

[0085] Depend on Image 6It can be seen that the potential difference of the main reference potential is calibrated by the positive and negative potentials plus the auxiliary reference potential, and the two are fitted to obtain the potentials of the positive and negative electrodes relative to Li, which can more intuitively reflect the negative lithium analysis potential; In addition, the potential of the positive electrode is subtracted from the potential of the negative electrode, and the charge-discharg...

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Abstract

The invention discloses a four-electrode lithium-ion battery and a potential measuring method thereof, comprising a shell, an electric core and an electrolyte, and the electric core includes N stacked electrode sheets; the main reference electrode is located on a diaphragm and the main reference electrode diaphragm The auxiliary reference electrode is located between a diaphragm and the auxiliary reference electrode diaphragm; at least one electrode sheet is arranged between the main reference electrode and the auxiliary reference electrode, and the auxiliary reference electrode is a lithium-plated electrode. When this four-electrode lithium-ion battery is used for potential measurement, the auxiliary reference electrode uses a lithium-plated electrode with high measurement accuracy. The lithium-plated electrode only needs to be used once for each measurement to calibrate the potential of the main reference electrode. The measurement work of the calibrated positive electrode and the calibrated negative electrode is completed by the main reference electrode, which greatly prolongs the service life of the lithium-plated electrode and avoids the premature consumption of lithium metal due to repeated long-term use of the lithium-plated electrode. .

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a four-electrode lithium ion battery and a potential measurement method thereof. Background technique [0002] With the application of lithium-ion batteries, there are more and more studies on its materials, performance and safety issues. In order to better study the performance of positive and negative electrodes of lithium-ion batteries, reference electrodes are often introduced, and the reference electrode is used as a standard , respectively test the potential of the positive or negative electrode with respect to the reference electrode. Therefore, starting from the internal reaction mechanism of the battery, the performance of the battery cycle, high and low temperature charge and discharge, and rate charge and discharge can be studied. It has very important guiding significance in battery structure design, pole piece design, positive and negative electrode rati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0585G01R29/12
CPCG01R29/12H01M10/0525H01M10/0585Y02E60/10Y02P70/50
Inventor 王振峰余仲宝常嵩王高峰范兵
Owner 创普斯(深圳)新能源科技集团有限公司
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