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Four-electrode lithium ion battery and potential measurement method thereof

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: 2020-02-14
创普斯(深圳)新能源科技有限公司
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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 potential measurement method thereof
  • Four-electrode lithium ion battery and potential measurement method thereof
  • Four-electrode lithium ion battery and potential measurement method thereof

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 respectively plus the auxiliary reference potential, and the two are fitted to obtain the potential of the positive and negative electrodes relative to Li, which can more intuitively reflect the lithium analysis potential of the negative electrode; In addition, the potential of the positive electrode is subtracted from the potential of the negative elect...

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Abstract

The invention discloses a four-electrode lithium ion battery and a potential measurement method thereof. The four-electrode lithium ion battery comprises a shell, a battery cell and an electrolyte. The battery cell comprises N stacked electrode plates. A main reference electrode is positioned between a diaphragm and a main reference electrode diaphragm. An auxiliary reference electrode is positioned between a diaphragm and an auxiliary reference electrode diaphragm. At least one electrode plate is arranged between the main reference electrode and the auxiliary reference electrode, and the auxiliary reference electrode is a lithium-plated electrode. During potential measurement of the four-electrode lithium ion battery, the auxiliary reference electrode adopts a lithium-plated electrode with relatively high measurement accuracy, the lithium-plated electrode only needs to use a potential for calibrating the main reference electrode once in each measurement, and the measurement work for the calibration of the positive plates and the calibration of the negative plates is completed by the main reference electrode. Therefore, the service life of the lithium-plated electrode is greatly prolonged, and the phenomenon of premature lithium metal consumption caused by multiple times of long-term use of the lithium-plated electrode is avoided.

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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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)新能源科技有限公司
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