Lithium battery testing device

Abstract

The lithium battery testing device adopts spring to connect the electrode seat and the conductive seat, and utilizes the elastic force of the spring to press the in-situ battery on the end face of the mold cavity, so that the rapid assembly and pressing of the in-situ battery are realized. The mold cavity is in a sealed state, and the Raman spectrum test can be simultaneously realized by penetrating the in-situ battery through the quartz glass and the observation hole. The scanning electron microscope (SEM) test can be realized by removing the upper mold and the quartz glass, so that the mold does not need to be replaced, and the same in-situ battery can be tested at the same time, the testing precision is high, and the result is more reliable. In addition, the utility model can adopt the conductive ring and the conductive seat to be respectively conductive with two electrode sheets of the in-situ battery, so that the in-situ observation of the electrode sheet material in the long-time charging and discharging process is realized, so that the requirements of the Raman spectrum test and the SEM are met. The utility model can adopt the locking head to lock the friction ring, so as to install the in-situ battery by using the insulating sleeve cavity, and the installation and test of the in-situ battery are facilitated.

Description

Technical Field

[0001] This utility model relates to battery testing technology, and in particular to a lithium battery testing device. Background Technology

[0002] In battery electrochemical experiments and testing, Raman spectroscopy and scanning electron microscopy (SEM) are commonly used characterization techniques, especially for observing subtle changes on the material surface during the reaction process, which can provide researchers with more accurate references. Currently, in-situ Raman spectroscopy is mainly performed using an in-situ Raman spectroscopy electrochemical cell. However, in-situ SEM requires changing the mold and the in-situ cell, which is inefficient and, due to variations in the in-situ cell, can potentially interfere with the testing accuracy, affecting the results—in other words, there is a single-factor variable problem.

[0003] Therefore, how to enable Raman spectroscopy and SEM testing, as well as in-situ charging and discharging testing and observation of the battery in the same mold after loading it into the in-situ, are the technical problems that need to be solved. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by this utility model is to provide a lithium battery testing device that can perform Raman spectroscopy and SEM tests respectively after loading an in-situ battery.

[0005] To achieve the above objectives, this utility model provides a lithium battery testing device for testing in-situ batteries. The in-situ battery includes a first electrode sheet, a second electrode sheet, and a separator. The first and second electrode sheets clamp or press the separator together. The device includes a lower mold and a middle mold, with the middle mold mounted on the lower mold. A mold cavity is provided between the lower and middle molds. An insulating sleeve, an insulating seat, and a spring are installed within the mold cavity. The insulating sleeve has a hollow cavity, and a conductive seat is slidably mounted within it. The insulating seat has a hollow cavity. One end of the spring is pressed or assembled with the conductive seat, and the other end is pressed or assembled with the electrode seat. One end of the electrode seat is inserted into the insulating seat cavity, and the other end protrudes from the lower mold. The electrode seat and the conductive seat are electrically connected via the spring. The second electrode of the in-situ battery is pressed directly or indirectly onto the conductive base (indirectly when a gasket is installed), and the first electrode is pressed directly or indirectly onto the end face of the mold cavity (indirectly when a conductive ring is set); the intermediate mold is provided with an observation hole, which penetrates the intermediate mold and communicates with the intermediate mold cavity, and the first electrode is observed through the observation hole.

[0006] As a further improvement of this utility model, it also includes an upper mold, which is installed on the middle mold. A quartz glass is installed on the upper mold, and the quartz glass is directly opposite the observation hole, so that the in-situ battery can be observed through the quartz glass and the observation hole.

[0007] As a further improvement of this utility model, the distance between the quartz glass and the first electrode sheet of the in-situ battery is controlled within 3mm, and the exposed diameter of the quartz glass is set to 8-12mm.

[0008] As a further improvement of this utility model, the middle mold is provided with a middle mold protrusion ring, the observation hole is connected to the middle mold cavity, the upper mold is provided with an upper mold hole and an upper mold groove, the upper mold hole is directly opposite the observation hole, and the middle mold protrusion ring is inserted into the upper mold groove to complete the positioning and assembly of the middle mold and the upper mold.

[0009] As a further improvement of this utility model, the upper mold is provided with an upper mold cavity, and the middle mold is provided with an upper mold groove corresponding to the upper mold cavity. The upper mold cavity and the upper mold groove are connected to form a chamber, and a gasket is installed in the upper mold groove. Quartz glass is installed in the upper mold cavity, and the quartz glass is pressed against the gasket. The gasket is provided with a gasket hole, and the gasket hole and the observation hole are directly connected. The gasket is pressed and sealed with the quartz glass, the middle mold, and the upper mold respectively.

[0010] As a further improvement of this utility model, the conductive seat is provided with a conductive base, one end of the spring is fitted onto the conductive base, and the other end is pressed or assembled with the electrode seat; an adjusting pin is installed on the conductive base, and the adjusting pin passes through the helical gap of the spring.

[0011] As a further improvement of this utility model, the lower mold is provided with a lower mold sealing groove and a lower mold sealing platform. A first sealing ring and a third sealing ring are respectively installed in the lower mold sealing groove and the lower mold sealing platform. The upper mold and the lower mold squeeze the first sealing ring to achieve sealing. The electrode seat end face of the electrode holder is pressed against one end of the second sealing ring, the second sealing ring is mounted on the insulating sealing platform, and the insulating sealing platform is set on the insulating seat; the insulating seat end face is provided on the insulating seat, and the insulating seat end face is pressed against one end of the third sealing ring.

[0012] As a further improvement of this utility model, the electrode holder is also provided with a screw part and a connecting hole, the connecting hole being used to connect with a wire; the screw part extends out of the insulating sleeve, and the extended part is screwed into the insulating cap by threads, so that the insulating cap covers the end of the electrode holder where the connecting hole is provided to form protection.

[0013] As a further improvement of this utility model, it also includes a conductive ring, which is fixed on the end face of the mold cavity away from the lower mold. The conductive ring is electrically connected through one end of the first connecting part. The first connecting part passes through the observation hole and is electrically connected to the second connecting part. The second connecting part is electrically connected to the conductive post.

[0014] As a further improvement of this utility model, a friction ring is provided on the conductive base, and the friction ring is pressed against the locking head of the locking member, so that the conductive base cannot slide; the locking member also includes an elastic sheet and a mounting ring, the mounting ring is fitted outside the insulating sleeve or the insulating base, the elastic sheet is elastic and one end is mounted on the mounting ring and the other end is assembled with the locking head, the elastic sheet provides elastic force to the locking head to press against the conductive base; The locking head is also provided with a notch, one side of which is a slope. The slope can fit with the unlocking surface. The unlocking surface is set on the unlocking sleeve, and the unlocking sleeve is installed on the middle mold. In the initial state, the locking head is pressed against the friction ring by the elastic force of the elastic plate; during the process of the middle mold being installed on the lower mold, the unlocking surface is inserted into the notch and the unlocking surface is in contact with the inclined surface. As the unlocking surface gradually moves towards the notch, it squeezes the locking head to overcome the elastic force of the elastic plate and gradually move away from the friction ring until it separates from the friction ring. After separation, the spring drives the conductive seat to squeeze the original battery towards the end face of the mold cavity.

[0015] The beneficial effects of this utility model are: This invention employs a spring to connect the electrode holder and the conductive seat, using the spring force to press the in-situ battery onto the end face of the mold cavity, thus achieving rapid assembly and compression of the in-situ battery. The mold cavity is sealed, and Raman spectroscopy testing can be simultaneously performed through the quartz glass and observation hole penetrating the in-situ battery (first electrode). Removing the upper mold and quartz glass allows for SEM testing, enabling testing of the same in-situ battery with high accuracy and more reliable results. Furthermore, this invention can use conductive rings and conductive seats to conduct electricity to the two electrode sheets of the in-situ battery respectively, enabling observation of charging and discharging states. This also allows for long-term observation, meeting the requirements of Raman spectroscopy and SEM testing. This invention uses a locking head to lock the friction ring, and then uses an unlocking sleeve to drive the locking head away from the friction ring, thereby releasing the conductive seat. This design allows for the installation of the in-situ battery using an insulating cavity. After unlocking, the spring force compresses the in-situ battery, thus pressing the first electrode sheet, second electrode sheet, and diaphragm, greatly facilitating the installation and testing of the in-situ battery. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of Embodiment 1. Figure 1 ; Figure 2 This is a structural schematic diagram of Embodiment 1. Figure 2 ; Figure 3 This is a cross-sectional view of Embodiment 1 located at the center plane of the axis of the insulating sleeve 430; Figure 4 This is a cross-sectional view of Embodiment 1 located on another central plane where the axis of the insulating sleeve 430 is located; Figure 5 The explosion of the parts in Example 1 Figure 1 ; Figure 6 The explosion of the parts in Example 1 Figure 2 ; Figure 7 This is a schematic diagram of the structure of the conductive base 410, spring 420, insulating sleeve 430, and insulating cap 450. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the conductive base 410, spring 420, insulating sleeve 430, and insulating cap 450. Figure 2 ; Figure 9 This is a cross-sectional view of Embodiment 1 located at the center plane of the axis of the insulating sleeve 430 (with the addition of a conductive ring 520). Figure 10 This is a partial structural diagram of the middle mold 120 in Embodiment 1 (with the addition of a conductive ring 520); Figure 11 This is a schematic diagram of the structure at washer 220 and conductive ring 520; Figure 12 This is a cross-sectional view of Embodiment 2 located at the center plane of the axis of the insulating sleeve 430; Figure 13 This is a cross-sectional view of Embodiment 3 located at the center plane of the insulating sleeve 430 axis; Figure 14 yes Figure 13 Enlarged view of point A in the middle; Figure 15 This is a schematic diagram of the structure of the insulating sleeve 430, locking member 710, and unlocking sleeve 720 in Embodiment 3. Figure 1 ; Figure 16 This is a schematic diagram of the structure of the insulating sleeve 430, locking member 710, and unlocking sleeve 720 in Embodiment 3. Figure 2 ; Figure 17 This is a schematic diagram of the structure in Embodiment 1 where the bracket 140 is replaced by the support plate 150. Figure 1 ; Figure 18 This is a schematic diagram of the structure in Embodiment 1 where the bracket 140 is replaced by the support plate 150. Figure 2 . Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example

[0018] See Figures 1-8The lithium battery testing device of this embodiment includes a lower mold 110, a middle mold 120, an upper mold 130, and a bracket 140. The lower mold 110 is mounted on the bracket 140. The lower mold 110 is provided with a lower mold cavity 111, a lower mold sealing groove 112, and a lower mold sealing platform 113. A first sealing ring 230 and a third sealing ring 250 are respectively installed in the lower mold sealing groove 112 and the lower mold sealing platform 113. Specifically, the bracket 140 is provided with a bracket hole 141, through which the lower mold 110 and the insulating cap 450 pass.

[0019] The middle mold 120 is provided with an observation hole 121, a middle mold cavity 122, and a middle mold protrusion ring 123. The observation hole 121 penetrates the middle mold 120 and communicates with the middle mold cavity 122. The middle mold cavity 122 communicates with the lower mold cavity 111 to form a mold cavity.

[0020] After the first screw 310 passes through the lower mold 110, it is screwed into the middle mold 120 to form a single unit, thereby sealing the lower mold 110 and the middle mold 120 by pressing the first sealing ring 230 between the lower mold 110 and the middle mold 120.

[0021] The upper mold 130 is provided with an upper mold hole 131 and an upper mold groove 132. The upper mold hole 131 is directly opposite to the observation hole 121. The middle mold protrusion ring 123 is inserted into the upper mold groove 132 to complete the positioning and assembly of the middle mold 120 and the upper mold 130. The second screw 320 passes through the upper mold 130 and is screwed into the middle mold 120 to fix the upper mold 130 on the middle mold 120.

[0022] The upper mold 130 is provided with an upper mold cavity 133, and the middle mold 120 is provided with an upper mold groove 124 corresponding to the upper mold cavity 133. The upper mold cavity 133 and the upper mold groove 124 are connected to form a chamber, and a gasket 220 is installed in the upper mold groove 124. Quartz glass 210 is installed in the upper mold cavity 133, and the quartz glass 210 is pressed against the gasket 220. The gasket 220 is provided with a gasket hole 221, and the observation hole 121 and the upper mold hole 131 are directly connected, so that the battery in place can be observed through the quartz glass 210 and the observation hole 121 during use. The gasket 220 is pressed and sealed with the quartz glass 210 and the middle mold 120 respectively, thereby achieving a seal between the upper mold 130 and the middle mold 120.

[0023] An insulating sleeve 430 and an insulating seat 470 are installed inside the mold cavity. The insulating sleeve 430 has a hollow insulating cavity 431 inside, and a conductive seat 410 is slidably installed inside the insulating cavity 431. The insulating seat 470 has a hollow insulating cavity 472 inside, and an insulating sealing platform 471 is provided at the end of the insulating cavity 472 away from the insulating sleeve 430. A conductive seat platform 411 is provided on the conductive seat 410. One end of a spring 420 is fitted onto the conductive seat platform 411, and the other end is pressed or assembled with an electrode seat 440. One end of the electrode seat 440 is inserted into the insulating cavity 472, and the other end protrudes from the lower mold 110. The spring 420 applies a spring force to the conductive seat 410 to resist its movement toward the electrode seat 440, and the spring 420 is conductive, thus electrically connecting the electrode seat 440 and the conductive seat 410.

[0024] The electrode holder 440 is also provided with a screw portion 441, a connecting hole 442, and an electrode holder end face 443. The connecting hole 442 is used to connect with a wire, thereby realizing the electrical connection between the corresponding electrode plate of the in-situ battery and the wire. The screw portion 441 extends out of the insulating sleeve 430, and the extended part is screwed into the insulating cap 450 by thread, so that the insulating cap 450 is fitted on the end of the electrode holder 440 where the connecting hole 442 is provided to form protection.

[0025] The electrode seat end face 443 is pressed against one end of the second sealing ring 240, and the second sealing ring 240 is installed on the insulating sealing platform 471, thereby achieving a seal between the electrode seat 440 and the insulating sleeve 430.

[0026] The insulating seat 470 is provided with an insulating seat end face 473, which is pressed against one end of the third sealing ring 250. The third sealing ring 250 is installed in the lower mold sealing platform 113, thereby achieving the sealing between the insulating sleeve 430 and the lower mold 110.

[0027] See Figure 9This describes the state of the in-situ battery after installation. The in-situ battery includes a first electrode 610, a second electrode 620, and a separator 630. The separator 630 contains electrolyte and is clamped between the first electrode 610 and the second electrode 620 to form the in-situ battery. This is the main structure of the battery in current in-situ Raman spectroscopy testing cells. The clamping force of the in-situ battery comes from the elastic force of the spring 420 being compressed; that is, the second electrode 620 is pressed against the conductive base 410, and the first electrode 610 is pressed against the end face of the middle mold cavity 122 away from the lower mold cavity 111. A gasket 640 is installed between the conductive base 410 and the second electrode 620 to achieve uniform pressure and conductivity on the second electrode 620. During testing, the polarities of the first electrode 610 and the second electrode 620 can be selected as needed, such as the first electrode 610 as the positive electrode and the second electrode 620 as the negative electrode, or vice versa. This method facilitates the observation and testing of different electrode plates. During testing, the support 140 can be fixed to the corresponding device, and then SEM testing can be performed. When Raman spectroscopy testing is required, the support 140 should be replaced with the support plate 150, as detailed in [link to documentation]. Figures 17-18 Of course, the entire device can be moved during testing and placed in different devices to complete the test. This allows for testing and observation of the same in-situ battery without the need to reinstall it, making it very convenient to use.

[0028] The design of the insulating sleeve 430 is to facilitate the installation of the battery in its original position, and to effectively prevent the conductive base 410 from conducting electricity with the middle mold 120, thus affecting normal use and testing.

[0029] Preferably, the distance between the quartz glass and the first electrode sheet is controlled within 3 mm. Compared with the prior art, this compact design significantly shortens the optical path, reduces signal attenuation, thereby enhancing the Raman signal intensity and improving the signal-to-noise ratio. Simultaneously, the exposed diameter of the quartz glass is set to 10 mm, facilitating matching with the micro Raman spectroscopy device, achieving precise focusing, obtaining clear, high-quality test signals, and improving the practicality of the device in dynamic monitoring of battery materials. The exposed diameter of the quartz glass has a significant impact on focusing and directly affects the experimental results.

[0030] Preferably, the diameter of the second electrode 620 is larger than that of the first electrode 610, the diameter of the first electrode 610 is smaller than that of the diaphragm, and the diameter of the diaphragm is larger than the inner diameter of the insulating sleeve cavity 431. This allows the end face of the diaphragm to be pressed tightly against the end of the insulating sleeve 430, ensuring that the second electrode 620 is housed within the insulating sleeve cavity 431 and does not contact the intermediate mold or the first electrode, thus achieving better testing results and ensuring testing stability. In some embodiments, the first electrode and the diaphragm can also be installed together in the insulating sleeve cavity, with the first electrode extending out of the insulating sleeve cavity and pressed tightly against the inner end face of the intermediate mold cavity. Of course, this is only an optional solution, and the specific method can be determined according to the actual situation. The insulating sleeve, insulating seat, and insulating cap are all made of non-conductive insulating material.

[0031] The usage process of this embodiment is roughly as follows: S100: Place the first electrode 610 inside the intermediate mold cavity 122, then place the diaphragm 630, drip sufficient electrolyte onto the diaphragm 630, then install the insulating sleeve 430, then place the second electrode 620, then place the gasket 640, then place the conductive seat 410, and finally place the spring 420 and the insulating seat 470. The insulating sleeve cavity 431 fits over the spring 420, the conductive seat 410, the gasket 640, and the second electrode 620. The spring 420 presses the gasket 640 against the second electrode 620 through its elastic force, thereby pressing the second electrode, the diaphragm, and the first electrode against the inner end face of the intermediate mold cavity 122 in sequence. The first electrode 610 and the second electrode 620 are the positive and negative electrodes, respectively.

[0032] S200. Install the lower mold 110 onto the middle mold 120 and tighten the first screw 310 to fix the lower mold and the middle mold into one piece.

[0033] S300. Install the washer 220 in the groove 124 of the upper mold, then install the quartz glass 210, and then install the upper mold 130. The upper mold cavity 133 is fitted over the quartz glass 210. The second screw 320 passes through the upper mold and is tightened with the middle mold to achieve the assembly and fixation of the upper mold and the middle mold. At this time, the mold cavity is in a sealed state and the test can begin.

[0034] Preferably, the first electrode sheet is electrically connected to the intermediate mold. In this case, the in-situ battery can be charged or discharged by connecting the intermediate mold (which is made of conductive material) and the electrode holder 440 to the two poles of the circuit, and it is also easy to observe.

[0035] More preferably, see Figures 9-11To more precisely control the charging and discharging of the in-situ battery, the intermediate mold can be made of insulating material. In this case, a conductive ring 520 needs to be added. The conductive ring 520 is fixed to the end face of the intermediate mold cavity 122 away from the lower mold 110, and is electrically connected through one end of the first connecting part 521. The first connecting part 521 passes through the observation hole 121 and is electrically connected to the second connecting part 522. The second connecting part 522 passes through the washer 220 and is electrically connected to the conductive post 510. In use, the conductive post 510 and the electrode holder 440 can be connected to the positive or negative terminals respectively to charge the in-situ battery. Raman spectroscopy and SEM can then be performed in this state to observe the discharge state of the in-situ battery. Example

[0036] See Figure 12 In practical use, it is sometimes necessary to adjust the elastic resistance of the spring on the movement of the conductive seat 410 towards the electrode seat 440. In Embodiment 1, this can only be achieved by replacing the spring, but this operation is relatively troublesome and requires constant adjustment. To address this, this embodiment installs an adjusting pin 460 on the conductive seat 411. The adjusting pin 460 passes through the helical gap 421 of the spring 420, and a square hole 412 is provided on the conductive seat 410 to facilitate rotation. During use, a hexagonal wrench is inserted into the square hole 412 to rotate the conductive seat 410, thereby adjusting the spring's movement towards or away from the conductive seat 411. This adjusts the spring's compression state, thus adjusting the elastic force that the conductive seat 410 needs to overcome to move towards the electrode seat 440. This elastic force is actually the clamping force used to subsequently press the battery in place.

[0037] The spring 420 can be pressed against the electrode holder 440, thereby adjusting the elastic damping between the electrode holder 440 and the conductive seat 410 by adjusting the compressible part of the spring. This design also facilitates installation, as the conductive seat 410 and spring 420 are pre-assembled, making installation easier. Example

[0038] See Figures 13-16 In some embodiments, the first electrode sheet, the separator, and the second electrode sheet are all installed within the insulating sleeve cavity 431. In this case, the first electrode sheet is pressed tightly against the intermediate mold or conductive ring to conduct electricity. The biggest advantage of this design is that the dimensions of the separator, the first electrode sheet, and the second electrode sheet are fixed, which facilitates subsequent processing. Furthermore, a single mold can be used for cutting. Additionally, it effectively reduces the deformation and warping of the separator 630 caused by the compression between the insulating sleeve 430 and the separator 630, which could affect the normal testing of the in-situ battery. However, this presents a problem: first, the insulating sleeve is inserted into the intermediate mold cavity 122, and then the first electrode sheet, separator, second electrode sheet, gasket, conductive seat, and spring are sequentially installed into the insulating sleeve. Because the intermediate mold cavity 122 is relatively deep, the installation is cumbersome and time-consuming.

[0039] Therefore, in this embodiment, the first electrode plate, diaphragm, second electrode plate, gasket, conductive seat, and spring are directly installed into the insulating sleeve, and then inserted into the intermediate mold cavity. This placement is very convenient. However, because the spring support keeps the end of the conductive seat near the end of the insulating sleeve, it is difficult to install the first electrode plate, diaphragm, second electrode plate, gasket, and conductive seat. Therefore, in this embodiment, the insulating sleeve and insulating seat are integrated into one piece, and a locking member 710 is added to lock the conductive seat, thereby preserving a certain amount of insulating sleeve cavity to facilitate the installation of the first electrode plate, diaphragm, second electrode plate, and gasket. Details are as follows: A friction ring 413 is provided on the conductive base 410. The friction ring 413 can be pressed against the locking head 711 of the locking member 710, thereby preventing the conductive base 410 from sliding. At this time, the spring can be in a compressed state, thus creating a space between the conductive base 410 and the opening of the insulating sleeve cavity 431. This space can accommodate the in-situ battery. The in-situ battery is located inside the insulating sleeve cavity 431, which can effectively prevent misalignment of the first electrode plate, diaphragm, and second electrode plate, and also facilitates the installation of the intermediate mold.

[0040] The locking component 710 also includes an elastic sheet 712 and a mounting ring 715. The mounting ring 715 is fitted onto the insulating sleeve 430 or the insulating base 470. The elastic sheet 712 is elastic and has one end mounted on the mounting ring 715 and the other end assembled with the locking head 711. The elastic sheet 712 provides a spring force to the locking head to press against the conductive base 410.

[0041] The locking head 711 is also provided with a notch 713, one side of which is a slope 714. The slope 714 can fit with the unlocking surface 721. The unlocking surface 721 is set on the unlocking sleeve 720, and the unlocking sleeve 720 is installed on the middle mold 120.

[0042] In the initial state (before the middle mold is installed), the locking head 711 is pressed against the friction ring 413 by the elastic force of the elastic sheet, so that the conductive seat 410 cannot move under the push of the spring 420. When it is necessary to install the battery in place, first install the insulating sleeve and electrode seat on the lower mold, then press the conductive seat 410 to overcome the friction between the locking head 711 and the friction ring 413, so as to push the conductive seat 410 towards the electrode seat 440, thereby leaving space between the conductive seat 410 and the opening end of the insulating sleeve cavity 431 to facilitate the sequential installation of the gasket, the second electrode sheet, the diaphragm, and the first electrode sheet, and then install the middle mold (the middle mold cavity 122 is installed outside the insulating sleeve) on the outside of the insulating sleeve 430.

[0043] The middle mold 120 is installed on the lower mold. During this process, the unlocking surface 721 is inserted into the notch 713 and the unlocking surface 721 is in contact with the inclined surface 714. As the unlocking surface 721 gradually moves towards the notch 713, the locking head 711 is squeezed to overcome the elastic force of the elastic sheet and gradually move away from the friction ring 413 until it is separated from the friction ring 413. After separation, the spring 420 drives the conductive seat 410 to squeeze the original battery towards the end face of the middle mold cavity 122, thus completing the clamping of the original battery and facilitating testing.

[0044] After the test is completed, the middle mold is opened, so that the unlocking sleeve 720 exits the notch 713, and the locking head 711 and the friction ring 413 are pressed together again. However, during this process, the spring has driven the conductive seat 410 to move away from the electrode seat 440, thereby pushing the original battery out of the insulating sleeve cavity to facilitate the removal of the original battery.

[0045] In this case, there are two dimensional relationships between the first electrode plate, the diaphragm, and the second electrode plate: Option A: The diameter of the second electrode plate is greater than the diameter of the first electrode plate; the diameter of the diaphragm is greater than the inner diameter of the insulating sleeve cavity; Option B: The diameter of the first electrode plate ≤ the diameter of the diaphragm ≤ the inner diameter of the insulating sleeve cavity.

[0046] See Figures 17-18 The bracket 140 in Embodiments 1 to 3 is used for scanning electron microscope testing, but it needs to be replaced with a support plate 150 for Raman testing. This is mainly to adapt to the structural characteristics and installation method of the Raman testing equipment. The support plate 150 is provided with a through support plate hole 151, and the insulating cap 450 passes through the support plate hole 151 so that the entire testing device can be assembled with the support plate 150.

[0047] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0048] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A lithium battery testing device for testing an in-situ battery, the in-situ battery comprising a first electrode plate, a second electrode plate, and a separator, wherein the first electrode plate and the second electrode plate clamp or press the separator together; characterized in that: The device includes a lower mold and a middle mold, with the middle mold mounted on the lower mold. A mold cavity is provided between the lower mold and the middle mold, and an insulating sleeve and an insulating seat are installed inside the mold cavity. The insulating sleeve has a hollow insulating cavity inside, and a conductive seat is slidably installed inside the insulating cavity. The insulating seat has a hollow insulating seat cavity inside. One end of a spring is pressed or assembled with the conductive seat, and the other end is pressed or assembled with an electrode seat. One end of the electrode seat is inserted into the insulating seat cavity, and the other end protrudes from the lower mold. The electrode seat and the conductive seat are electrically connected through the spring. The second electrode of the in-situ battery is directly or indirectly pressed onto the conductive base, and the first electrode is directly or indirectly pressed onto the end face of the mold cavity; an observation hole is provided on the intermediate mold, which penetrates the intermediate mold and communicates with the intermediate mold cavity, and the first electrode is observed through the observation hole.

2. The lithium battery testing device according to claim 1, characterized in that: It also includes an upper mold, which is installed on the middle mold. Quartz glass is installed on the upper mold and is directly opposite the observation hole, so that the in-situ battery can be observed through the quartz glass and the observation hole.

3. The lithium battery testing device according to claim 2, characterized in that: The distance between the quartz glass and the first electrode plate of the in-situ battery is controlled within 3mm, and the exposed diameter of the quartz glass is set to 8-12mm.

4. The lithium battery testing device according to claim 2, characterized in that: The middle mold is provided with a middle mold protrusion ring, the observation hole is connected to the middle mold cavity, the upper mold is provided with an upper mold hole and an upper mold groove, the upper mold hole is directly opposite the observation hole, and the middle mold protrusion ring is inserted into the upper mold groove to complete the positioning and assembly of the middle mold and the upper mold.

5. The lithium battery testing device according to claim 2, characterized in that: The upper mold is provided with an upper mold cavity, and the middle mold is provided with an upper mold groove corresponding to the upper mold cavity. The upper mold cavity and the upper mold groove are connected to form a chamber, and a gasket is installed in the upper mold groove. Quartz glass is installed in the upper mold cavity, and the quartz glass is pressed against the gasket. The gasket is provided with a gasket hole, and the gasket hole and the observation hole are directly connected. The gasket is pressed and sealed with the quartz glass, the middle mold, and the upper mold respectively.

6. The lithium battery testing device according to claim 1, characterized in that: The conductive base is provided with a conductive platform, one end of the spring is fitted onto the conductive platform, and the other end is pressed or assembled with the electrode base; an adjusting pin is installed on the conductive platform, and the adjusting pin passes through the helical gap of the spring.

7. The lithium battery testing device according to claim 1, characterized in that: The lower mold is provided with a lower mold sealing groove and a lower mold sealing platform. A first sealing ring and a third sealing ring are respectively installed in the lower mold sealing groove and the lower mold sealing platform. The upper mold and the lower mold squeeze the first sealing ring to achieve sealing. The electrode seat end face of the electrode holder is pressed against one end of the second sealing ring, the second sealing ring is mounted on the insulating sealing platform, and the insulating sealing platform is set on the insulating seat; the insulating seat end face is provided on the insulating seat, and the insulating seat end face is pressed against one end of the third sealing ring.

8. The lithium battery testing device according to claim 1, characterized in that: The electrode holder is also provided with a screw part and a connecting hole, the connecting hole being used to connect with a wire; the screw part extends out of the insulating sleeve, and the extended part is screwed into the insulating cap by threads, so that the insulating cap covers the end of the electrode holder where the connecting hole is provided to form protection.

9. The lithium battery testing apparatus according to any one of claims 1-8, characterized in that: It also includes a conductive ring, which is fixed on the end face of the mold cavity away from the lower mold. The conductive ring is electrically connected through one end of the first connecting part. The first connecting part passes through the observation hole and is electrically connected to the second connecting part. The second connecting part is electrically connected to the conductive post.

10. The lithium battery testing apparatus according to any one of claims 1-8, characterized in that: A friction ring is provided on the conductive base, and the friction ring is pressed against the locking head of the locking member, so that the conductive base cannot slide; the locking member also includes an elastic sheet and a mounting ring. The mounting ring is fitted outside the insulating sleeve or the insulating base. The elastic sheet is elastic and one end is mounted on the mounting ring and the other end is assembled with the locking head. The elastic sheet provides a spring force to the locking head to press against the conductive base. The locking head is also provided with a notch, one side of which is a slope. The slope can fit with the unlocking surface. The unlocking surface is set on the unlocking sleeve, and the unlocking sleeve is installed on the middle mold. In the initial state, the locking head is pressed against the friction ring by the elastic force of the elastic plate; during the process of the middle mold being installed on the lower mold, the unlocking surface is inserted into the notch and the unlocking surface is in contact with the inclined surface. As the unlocking surface gradually moves towards the notch, it squeezes the locking head to overcome the elastic force of the elastic plate and gradually move away from the friction ring until it separates from the friction ring. After separation, the spring drives the conductive seat to squeeze the original battery towards the end face of the mold cavity.

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