In-situ cell for measuring chemical strain of electrode charge-discharge process

Abstract

The application provides an in-situ battery for measuring chemical strain of electrode charging and discharging process, and relates to the technical field of batteries, which comprises an upper cover, a support frame, a battery body, quartz glass, a sealing ring, a positive electrode terminal, a negative electrode terminal, a positive electrode carrier and a negative electrode carrier; a hole is arranged in the middle of the support frame; the battery body is arranged on the support frame; the upper end of the battery body is provided with a wiring area; the quartz glass is arranged on the battery body through the sealing ring and covers the wiring area; the upper cover is arranged on the quartz glass; the upper cover, the battery body and the support frame are fixedly connected through bolts; the positive electrode carrier and the negative electrode carrier are both arranged in the wiring area; a diaphragm is arranged between the positive electrode carrier and the negative electrode carrier; the positive electrode carrier is connected with the positive electrode of the battery body, and the negative electrode carrier is connected with the negative electrode of the battery body. The application is simple, and can avoid short circuit caused by mutual contact between the positive electrode and the negative electrode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to an in-situ battery for measuring chemical strain of electrode charging and discharging process. BACKGROUND

[0002] With the urgent global demand for sustainable development and clean energy, energy storage technology, as a key bridge connecting renewable energy production and consumption, has become increasingly important. As the focus of current energy storage technology, lithium-ion batteries have been widely used in various fields. Although liquid lithium-ion batteries (LIBs) are now widely used in portable electronic devices, electric vehicles and large-scale energy storage devices, they still face serious challenges. During the cycle, lithium ions are repeatedly inserted and extracted from the active material, causing the volume of the electrode to change periodically. The volume expansion / contraction caused by lithiation / delithiation inevitably causes strain (stress) fatigue and may eventually trigger cracks in the active material and composite electrode due to the restriction of the current collector, which is considered to be the main reason for the capacity decline and service life attenuation of lithium-ion batteries. Studying the electrochemical-mechanical coupling behavior of the electrode, including the electrochemical stress, strain, elastic modulus and other properties caused by lithiation / delithiation during the cycle, is of great significance to understanding the failure of LIBs and the optimization design of electrodes and batteries.

[0003] To this end, researchers have developed several methods to study the chemical strain / stress generated in the electrode during the cycle, mainly including digital image correlation (DIC) technology and curvature measurement method. The measurement of chemical strain caused by lithium insertion / extraction is usually carried out on a thin film electrode without a substrate using DIC technology, so it is important to design a reasonable and excellent original strain test battery to accurately measure the chemical strain caused by lithium insertion / extraction.

[0004] The existing in-situ strain test battery in China has poor sealing, and the sealing requirement for lithium-ion batteries and sodium-ion batteries is higher. The oxidation of sodium and lithium sheets during the in-situ test process can greatly affect the performance of the battery, and the self-supporting electrode may be bent during the charging and discharging process, which can easily cause short circuit between the positive and negative electrodes, resulting in experimental failure. SUMMARY

[0005] The purpose of the present application is to provide an in-situ battery for measuring the chemical strain of the electrode charging and discharging process, which is simple and can avoid short circuit between the positive and negative electrodes.

[0006] An in-situ battery for measuring the chemical strain of the electrode charging and discharging process, comprising: an upper cover, a support frame, a battery body, a quartz glass, a sealing ring, a positive terminal post, a negative terminal post, a positive carrier and a negative carrier.

[0007] The support frame is provided with a hole in the middle; the battery body is arranged on the support frame; and the upper end of the battery body is provided with a wiring area;

[0008] The quartz glass is arranged on the battery body through the sealing ring and covers the wiring area; the upper cover is arranged on the quartz glass; and the upper cover, the battery body and the support frame are fixedly connected through bolts;

[0009] The positive electrode carrier and the negative electrode carrier are arranged in the wiring area; and a diaphragm is arranged between the positive electrode carrier and the negative electrode carrier;

[0010] The positive electrode carrier is connected with the positive electrode of the battery body, and the negative electrode carrier is connected with the negative electrode of the battery body; and the positive electrode carrier is arranged on the negative electrode carrier;

[0011] The first end of the positive electrode terminal post is fixedly connected with the positive electrode carrier through a positive electrode nut, and the first end of the negative electrode terminal post is fixedly connected with the positive electrode carrier through a negative electrode nut;

[0012] The second end of the positive electrode terminal post extends into the hole through the battery body; and the second end of the negative electrode terminal post extends into the hole through the battery body.

[0013] Optionally, the battery body is provided with a groove, and the sealing ring is arranged in the groove.

[0014] Optionally, the positive electrode carrier is provided with a positive electrode terminal post hole and a first negative electrode terminal post hole; and the negative electrode carrier is provided with a second negative electrode terminal post hole;

[0015] The first end of the positive electrode terminal post is fixedly connected with the positive electrode carrier through the positive electrode nut and the positive electrode terminal post hole;

[0016] The first end of the negative electrode terminal post is fixedly connected with the positive electrode carrier through the negative electrode nut, the second negative electrode terminal post hole and the first negative electrode terminal post hole in sequence.

[0017] Optionally, the number of the bolts is 8.

[0018] Optionally, the sealing ring is made of silica gel.

[0019] Effects of the application are as follows:

[0020] The in-situ battery for measuring the chemical strain of the electrode charging and discharging process is provided with a diaphragm between the positive electrode carrier and the negative electrode carrier, so that short circuit caused by the contact between the self-supporting electrode and the counter electrode plate is avoided; the sealing ring is arranged between the upper cover and the quartz glass, so that the sealing property of the battery is improved; and the result is simple and has good repeatability. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a top view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application;

[0022] Figure 2 is a sectional view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application;

[0023] Figure 3 is a side view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application;

[0024] Figure 4 is an exploded view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application.

[0025] Figure 5 is a schematic diagram of the positive electrode carrier and the negative electrode carrier structure of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application.

[0026] In the figure: 001, bolt; 002, upper cover; 003, quartz glass; 004, sealing ring; 005, positive electrode nut; 006, negative electrode nut; 007, positive electrode carrier; 008, battery body; 009, support frame; 010, positive electrode terminal post; 011, negative electrode terminal post; 012, negative electrode carrier; 013, first negative electrode terminal post hole; 014, positive electrode terminal post hole; 015, diaphragm; 016, second negative electrode terminal post hole. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings.

[0028] Figure 1 is a top view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application; Figure 2 is a sectional view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application; Figure 3 is a side view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application; Figure 4 is an exploded view of an in-situ battery for measuring the chemical strain of an electrode during charging and discharging according to the present application. As shown in Figures 1-4 the present application provides an in-situ battery for measuring the chemical strain of an electrode during charging and discharging, which comprises an upper cover 002, a support frame 009, a battery body 008, a quartz glass 003, a sealing ring 004, a positive electrode terminal post 010, a negative electrode terminal post 011, a positive electrode carrier 007, and a negative electrode carrier 012.

[0029] The support frame 009 is provided with a hole in the middle; the battery body 008 is arranged on the support frame 009; and the upper end of the battery body 008 is provided with a terminal area.

[0030] The quartz glass 003 is arranged on the battery body 008 through the sealing ring 004 and covers the wiring area; the upper cover 002 is arranged on the quartz glass 003; the upper cover 002, the battery body 008 and the support frame 009 are fixedly connected through the bolts 001. In the embodiment, the number of the bolts 001 is 8. Preferably, the sealing ring 004 is made of silica gel.

[0031] The positive electrode carrier 007 and the negative electrode carrier 012 are arranged in the wiring area; the diaphragm 015 is arranged between the positive electrode carrier 007 and the negative electrode carrier 012.

[0032] The positive electrode carrier 007 is connected with the positive electrode of the battery body 008, and the negative electrode carrier 012 is connected with the negative electrode of the battery body 008; the positive electrode carrier 007 is arranged on the negative electrode carrier 012.

[0033] The first end of the positive electrode terminal post 010 is fixedly connected with the positive electrode carrier 007 through the positive electrode nut 005, and the first end of the negative electrode terminal post 011 is fixedly connected with the positive electrode carrier 007 through the negative electrode nut 006.

[0034] Specifically, as shown in Figure 5 The positive electrode terminal post hole 014 and the first negative electrode terminal post hole 013 are arranged on the positive electrode carrier 007; the second negative electrode terminal post hole 016 is arranged on the negative electrode carrier 012.

[0035] The first end of the positive electrode terminal post 010 is fixedly connected with the positive electrode carrier 007 through the positive electrode nut 005.

[0036] The first end of the negative electrode terminal post 011 is fixedly connected with the positive electrode carrier 007 through the negative electrode nut 006 in sequence through the second negative electrode terminal post hole 016 and the first negative electrode terminal post hole 013.

[0037] The second end of the positive electrode terminal post 010 extends into the hole through the battery body 008; the second end of the negative electrode terminal post 011 extends into the hole through the battery body 008.

[0038] Preferably, the recess is arranged on the battery body 008, and the sealing ring 004 is arranged in the recess.

[0039] The specific assembly process of the in-situ battery is as follows:

[0040] The positive electrode terminal post 010 and the negative electrode terminal post 011 are placed in the battery body 008. The battery body 008 is placed on the support frame 009.

[0041] The positive electrode carrier 007 and the negative electrode carrier 012 are assembled together and fixed to each other. The diaphragm 015 is placed between the positive electrode carrier 007 and the negative electrode carrier 012.

[0042] The positive electrode carrier 007, the negative electrode carrier 012 and the separator 015 are prevented from being in the wiring area, and the positive electrode nut 005 is screwed on the positive electrode terminal post 010, and the negative electrode nut 006 is screwed on the negative electrode terminal post 011.

[0043] The sealing ring 004 is correctly placed in the groove on the battery body 008.

[0044] The quartz glass 003 is then correctly placed on the sealing ring 004, pressing the sealing ring 004.

[0045] The upper cover 002 is correctly placed on the quartz glass 003, and it is ensured that the parts of the battery in place are parallel to each other and have the same outer diameter.

[0046] The bolts 001 are all threaded through the upper cover 002, the battery body 008 and the support frame 009 and are tightened.

[0047] The above-described embodiments are only to describe the preferred embodiments of the present application, and not to limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope determined by the claims of the present application.

Claims

1. An in-situ battery for measuring the chemical strain of an electrode during charge and discharge processes, characterized by, It includes: The upper cover, support frame, battery body, quartz glass, sealing ring, positive terminal post, negative terminal post, positive carrier and negative carrier; The middle of the support frame is provided with a hole; the battery body is arranged on the support frame; the upper end of the battery body is provided with a wiring area; The quartz glass is arranged on the battery body through the sealing ring and covers the wiring area; the upper cover is arranged on the quartz glass; the upper cover, the battery body and the support frame are fixedly connected through bolts; The positive carrier and the negative carrier are both arranged in the wiring area; a diaphragm is arranged between the positive carrier and the negative carrier; The positive carrier is connected with the positive electrode of the battery body, and the negative carrier is connected with the negative electrode of the battery body; the positive carrier is arranged on the negative carrier; The first end of the positive terminal post is fixedly connected with the positive carrier through a positive nut, and the first end of the negative terminal post is fixedly connected with the positive carrier through a negative nut; The second end of the positive terminal post extends to the hole through the battery body; the second end of the negative terminal post extends to the hole through the battery body.

2. The battery of claim 1, wherein, A groove is arranged on the battery body, and the sealing ring is arranged in the groove.

3. The battery of claim 1, wherein, A positive terminal post hole and a first negative terminal post hole are arranged on the positive carrier; a second negative terminal post hole is arranged on the negative carrier; The first end of the positive terminal post passes through the positive terminal post hole and is fixedly connected with the positive carrier through the positive nut; The first end of the negative terminal post passes through the second negative terminal post hole and the first negative terminal post hole in sequence and is fixedly connected with the positive carrier through the negative nut.

4. The battery of claim 1, wherein, The number of the bolts is 8.

5. The battery of claim 1, wherein, The sealing ring is made of silica gel.

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