In-situ battery for measuring chemical strain in electrode charging and discharging process

Abstract

The invention provides an in-situ battery for measuring chemical strain of an electrode in a charging and discharging process, which relates to the technical field of batteries and comprises an upper cover, a support frame, a battery body, quartz glass, a sealing ring, a positive terminal, a negative terminal, a positive carrier and a negative carrier, holes are formed in the middles of the supporting frames; the battery body is arranged on the support frame; a wiring area is arranged at the upper end of the battery body; 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 arranged in the wiring area; a diaphragm is arranged between the anode carrier and the cathode carrier; the anode carrier is connected with the anode of the battery body, and the cathode carrier is connected with the cathode of the battery body. The structure is simple, and short circuit caused by mutual contact between positive and negative electrodes can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to an in-situ battery for measuring the chemical strain during the charge and discharge process of an electrode. Background Art

[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 many 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 severe challenges. During cycling, lithium ions repeatedly intercalate and deintercalate from the active material, resulting in periodic changes in the electrode volume. The volume expansion / contraction caused by lithiation / delithiation inevitably causes strain (stress) fatigue and may eventually initiate cracks in the active material and composite electrode due to the limitation of the current collector, which is considered the main reason for the decline in the cycle capacity and service life of lithium-ion batteries. Studying the electrochemical-mechanical coupling behavior of electrodes, including properties such as electrochemical stress, strain, and elastic modulus caused by lithiation / delithiation during cycling, is of great significance for understanding the failure of LIBs and the optimized design of electrodes and batteries.

[0003] For this reason, researchers have developed several methods to study the chemical strain / stress generated in the electrode during cycling, mainly including digital image correlation (DIC) technology and curvature measurement methods. The measurement of chemical strain caused by lithium intercalation / deintercalation is usually carried out on a substrate-free thin-film electrode using DIC technology. Therefore, designing a reasonable and excellent in-situ strain test battery is an important tool for accurately measuring the chemical strain caused by lithium intercalation / deintercalation.

[0004] At present, the existing in-situ strain test batteries in China have poor sealing performance. For lithium-ion batteries and sodium-ion batteries, high sealing requirements are imposed on the batteries. During the in-situ test process, the oxidation of sodium and lithium sheets will greatly affect the performance of the batteries, and the self-supporting electrodes will bend during the charge and discharge process, easily causing short circuits between the positive and negative electrodes, resulting in experimental failures. Summary of the Invention

[0005] The purpose of the present invention is to provide an in-situ battery for measuring the chemical strain during the charge and discharge process of an electrode, with simple results, which can avoid short circuits caused by mutual contact between the positive and negative electrodes.

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

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

[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; the upper cover, the battery body and the support frame are fixedly connected by bolts;

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

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

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

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

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

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

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

[0016] The first end of the negative electrode terminal sequentially passes through the second negative electrode terminal hole and the first negative electrode terminal hole and is fixedly connected to the positive electrode carrier through the negative electrode nut.

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

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

[0019] The effects of the present invention are as follows:

[0020] The in-situ battery of the present invention for measuring the chemical strain during the charge and discharge process of the electrode is provided with a separator between the positive electrode carrier and the negative electrode carrier to avoid short circuit caused by the contact between the self-supporting electrode and the counter electrode plate. A sealing ring is provided between the upper cover and the quartz glass to improve the sealing performance of the battery. The result is simple and the repeatability is good. Brief Description of the Drawings

[0021] Figure 1 is a top view of the in-situ cell of the present invention for measuring the chemical strain during the charge and discharge process of the electrode;

[0022] Figure 2 is a cross-sectional view of the in-situ cell of the present invention for measuring the chemical strain during the charge and discharge process of the electrode;

[0023] Figure 3 is a side view of the in-situ cell of the present invention for measuring the chemical strain during the charge and discharge process of the electrode;

[0024] Figure 4 is an exploded view of the in-situ cell of the present invention for measuring the chemical strain during the charge and discharge process of the electrode;

[0025] Figure 5 is a schematic structural view of the positive electrode carrier and the negative electrode carrier of the in-situ cell of the present invention for measuring the chemical strain during the charge and discharge process of the electrode.

[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; 011, negative electrode terminal; 012, negative electrode carrier; 013, first negative electrode terminal hole; 014, positive electrode terminal hole; 015, diaphragm; 016, second negative electrode terminal hole. Detailed Embodiments

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

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

[0029] A hole is provided in the middle of the support frame 009; the battery body 008 is arranged on the support frame 009; a wiring area is provided at the upper end of the battery body 008.

[0030] The fused silica 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 fused silica glass 003; the upper cover 002, the battery body 008 and the support frame 009 are fixedly connected by bolts 001. In this embodiment, the number of bolts 001 is 8. Preferably, the sealing ring 004 is made of silica gel material.

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

[0032] The positive electrode carrier 007 is connected to the positive electrode of the battery body 008, and the negative electrode carrier 012 is connected to 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 010 is fixedly connected to the positive electrode carrier 007 through the positive electrode nut 005, and the first end of the negative electrode terminal 011 is fixedly connected to the positive electrode carrier 007 through the negative electrode nut 006.

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

[0035] The first end of the positive electrode terminal 010 passes through the positive electrode terminal hole 014 and is fixedly connected to the positive electrode carrier 007 through the positive electrode nut 005.

[0036] The first end of the negative electrode terminal 011 sequentially passes through the second negative electrode terminal hole 016 and the first negative electrode terminal hole 013 and is fixedly connected to the positive electrode carrier 007 through the negative electrode nut 006.

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

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

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

[0040] Put the positive electrode terminal 010 and the negative electrode terminal 011 into the battery body 008. Place the battery body 008 on the support frame 009.

[0041] Assemble the positive electrode carrier 007 and the negative electrode carrier 012 together and ensure they are fixed to each other. Place the separator 015 between the positive electrode carrier 007 and the negative electrode carrier 012.

[0042] Place the positive electrode carrier 007, negative electrode carrier 012 and separator 015 in the wiring area, screw the positive electrode nut 005 onto the positive electrode terminal 010, and screw the negative electrode nut 006 onto the negative electrode terminal 011.

[0043] Place the sealing ring 004 correctly in the groove on the battery body 008.

[0044] Subsequently, place the quartz glass 003 correctly on the sealing ring 004, pressing down on the sealing ring 004.

[0045] Place the upper cover 002 correctly on the quartz glass 003 and ensure that all parts of the in-situ battery are parallel to each other and have the same outer diameter.

[0046] Pass all the bolts 001 through the upper cover 002, battery body 008 and support frame 009 and tighten them.

[0047] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

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

2. The in-situ battery according to claim 1, characterized in that: The battery body is provided with a groove, and the sealing ring is arranged in the groove.

3. The in-situ battery according to claim 1, characterized in that: The positive electrode carrier is provided with a positive electrode terminal hole and a first negative electrode terminal hole; the negative electrode carrier is provided with a second negative electrode terminal hole; The first end of the positive electrode terminal passes through the positive electrode terminal hole and is fixedly connected to the positive electrode carrier through the positive electrode nut; The first end of the negative electrode terminal sequentially passes through the second negative electrode terminal hole and the first negative electrode terminal hole and is fixedly connected to the positive electrode carrier through the negative electrode nut.

4. The in-situ battery according to claim 1, characterized in that: The number of the bolts is 8.

5. The in-situ battery according to claim 1, characterized in that: The sealing ring is made of silicone.

Images