Dynamic regulation and control system for external pressure of all-solid-state lithium battery

Abstract

The utility model provides an all-solid-state lithium battery external pressure dynamic regulation and control system which comprises a turn-back type servo electric cylinder, the turn-back type servo electric cylinder comprises a servo motor, a speed reducer and a lead screw, an upper bottom plate is installed on the lower portion of the lead screw, and four supporting rods and a lower bottom plate are arranged on the lower portion of the upper bottom plate. A pressing plate, a pressure sensor and a pressing rod are arranged on the portion, penetrating through the upper bottom plate, of the lead screw, and the servo motor and the pressure sensor are connected with a motion control card and an acquisition card respectively. According to the utility model, the turn-back type servo electric cylinder and the battery circulation tester are arranged to circulate the all-solid-state lithium battery during uniaxial pressurization and test the performance of the battery in an external pressure state, and the pressure sensor, the motion control card and the acquisition card are arranged to collect the voltage and pressure of the all-solid-state lithium battery in real time and adjust the pressure, so that the performance of the all-solid-state lithium battery is tested. The test of changing the external pressure of the all-solid-state lithium battery according to the voltage in the circulation process of the all-solid-state lithium battery is realized, and the system has the advantages of high timeliness, high efficiency, high voltage transformation speed and high automation degree.

Description

Technical Field

[0001] This utility model belongs to the technical field of dynamic control system for external pressure of lithium-ion batteries, and specifically relates to a dynamic control system for external pressure of all-solid-state lithium batteries. Background Technology

[0002] For decades, lithium batteries have gradually become one of the most advanced energy storage materials in the world, with extremely wide applications in electric vehicles and mobile phones. Typical batteries currently in use include the ternary nickel-cobalt-manganese lithium iron phosphate battery used by BYD and the lithium cobalt oxide lithium iron phosphate battery used by Apple. Both use organic electrolytes as electrolytes and graphite as the negative electrode material. However, due to the unavoidable uneven deposition of lithium during cycling, lithium dendrites often grow inside the battery after long-term cycling, penetrating the electrolyte and separator, eventually connecting the positive and negative electrodes, causing short circuits and various safety problems. On the other hand, the specific capacity of liquid lithium-ion batteries is relatively low, which can no longer meet people's needs for extended battery life. Therefore, to solve the above two problems, people hope to use other high-specific-capacity electrodes (lithium (3840mAh / g), silicon (3600mAh / g)) to replace graphite (340mAh / g), and use solid ceramic electrolytes to replace flammable liquid organic electrolytes. This is the new generation of solid-state lithium-ion batteries. However, the introduction of solid-state electrolytes has also brought new problems. Solid-solid contacts between batteries are more prone to damage than solid-liquid contacts. To maintain good internal contact during cycling, a relatively large external pressure is often required, but the mechanism of pressure influence and the optimal application pressure under different conditions are not yet clear. We believe that since the volume of most positive electrode materials remains essentially unchanged during lithium plating and removal, reducing the pressure during charging of the negative electrode material to achieve better lithium capacity, followed by increasing the pressure during discharge to achieve better contact, may improve battery cycle performance. Therefore, further research on the influence of external pressure during battery cycling is necessary to improve battery cycle performance.

[0003] Currently, researchers have reported two main methods for pressurizing batteries during cycling. The first method uses a cylindrical mold for uniaxial pressurization, which is simpler in structure but suffers from uneven pressure and problems such as loose bolts causing unloading. The second method uses gas or fluid for hydrostatic pressurization, which provides relatively uniform pressure, but its structure is too complex to be practically applied. A system that can automatically change the pressure during battery cycling has not yet been realized.

[0004] Therefore, there is a need to provide a dynamic control system for external pressure of all-solid-state lithium batteries. Utility Model Content

[0005] The technical problem this invention aims to solve is to address the shortcomings of the existing technology by providing a dynamic external pressure control system for all-solid-state lithium batteries. This system, through the use of a folding servo cylinder and a battery cycle tester, cycles the all-solid-state lithium battery under uniaxial pressure to test its performance under external pressure. Furthermore, by using pressure sensors, motion control cards, and data acquisition cards, it collects the voltage and pressure data of the all-solid-state lithium battery in real time and adjusts the applied pressure accordingly. This allows for testing of the external pressure based on voltage changes during the cycling process of the all-solid-state lithium battery, offering advantages such as high timeliness, high efficiency, fast pressure change, and high automation.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a dynamic control system for external pressure of an all-solid-state lithium battery, characterized in that the system includes a folding servo cylinder, the folding servo cylinder including a servo motor, a reducer and a lead screw connected in sequence, an upper base plate fixedly installed at the lower part of the lead screw, four support rods arranged at the lower part of the upper base plate, the lower part of the four support rods connected to a lower base plate, the lead screw passing through the upper base plate, a pressure plate and a pressure sensor arranged in sequence at the part of the lead screw passing through the upper base plate, a pressure rod arranged below the pressure sensor, and the servo motor and pressure sensor respectively connected to the motion control card and data acquisition card of the main control center.

[0007] The above-mentioned all-solid-state lithium battery external pressure dynamic control system is characterized in that an all-solid-state lithium battery is installed on the lower base plate, and the all-solid-state lithium battery is connected to a battery cycle tester and a data acquisition card of the main control center.

[0008] The above-mentioned all-solid-state lithium battery external pressure dynamic control system is characterized in that the pressure sensor is connected to the transmitter of the main control center, and the transmitter is connected to the acquisition card of the main control center.

[0009] The aforementioned all-solid-state lithium battery external pressure dynamic control system is characterized in that both the motion control card and the acquisition card are connected to a computer.

[0010] The above-mentioned dynamic external pressure control system for an all-solid-state lithium battery is characterized in that a groove for mounting the all-solid-state lithium battery is provided on the lower base plate, and the groove corresponds to the position of the pressure rod.

[0011] The above-mentioned all-solid-state lithium battery external pressure dynamic control system is characterized in that the lead screw is equipped with an upper limit switch and a lower limit switch, the lead screw is equipped with a magnetic ring that cooperates with the upper limit switch and the lower limit switch, and the upper limit switch and the lower limit switch are connected to the motion control card of the main control center.

[0012] The aforementioned all-solid-state lithium battery external pressure dynamic control system is characterized in that the lead screw and the upper base plate are connected by bolts through the screw holes at the bottom of the lead screw.

[0013] The above-mentioned all-solid-state lithium battery external pressure dynamic control system is characterized in that the pressure plate and the pressure sensor are of the same size, and the pressure sensor is fixed to the pressure plate by bolts.

[0014] This utility model has the following advantages compared with the prior art:

[0015] 1. This utility model uses a folding servo cylinder to apply displacement to a solid-state lithium battery via a single-axis pressurization method. By connecting the solid-state lithium battery to a battery cycle tester, the battery is cycled during single-axis pressurization to test its performance under external pressure. Furthermore, by setting up a pressure sensor, motion control card, and data acquisition card, the voltage and pressure data of the solid-state lithium battery are collected in real time, and the pressurization pressure is adjusted accordingly. This allows for testing of the external pressure of the solid-state lithium battery during cycle based on voltage changes, offering advantages such as high timeliness, high efficiency, fast pressure change speed, and high degree of automation.

[0016] 2. This utility model uses a folding servo electric cylinder, in which the servo motor is mainly used to control the lead screw and pressure rod to pressurize the all-solid-state lithium battery by applying displacement. It has the advantages of relatively stable pressure and is not easy to automatically depressurize. By setting a reducer, the displacement speed is controlled to prevent excessive pressure. By setting a pressure rod, a larger pressure is applied.

[0017] 3. This utility model connects an all-solid-state lithium battery to a battery cycle tester, cycles the all-solid-state lithium battery under pressure, tests the battery's performance under external pressure, and collects the all-solid-state lithium battery performance data through a data acquisition card.

[0018] 4. This utility model connects the motion control card and the data acquisition card to a computer. The data acquisition card is used to monitor the real-time voltage and pressure of the all-solid-state lithium battery and read the data through the computer. The computer controls the motion control card to control the folding servo electric cylinder to pressurize, thereby realizing the real-time voltage and pressure monitoring of the all-solid-state lithium battery while pressurizing.

[0019] In summary, the dynamic external pressure control system for all-solid-state lithium batteries of this invention is particularly suitable for external pressure testing of all-solid-state lithium batteries. Compared with the traditional manual change of external pressure, it can achieve more precise pressure control and automatically change the pressure according to the battery cycle process. It belongs to the field of automatic pressure control devices in the field of energy storage materials.

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the external pressure dynamic control system for all-solid-state lithium batteries of the present invention.

[0022] Figure 2 This is a schematic diagram showing the positional relationship between the lower base plate and the all-solid-state lithium battery in the all-solid-state lithium battery external pressure dynamic control system of the present invention.

[0023] Figure 3 This is a connection diagram of the all-solid-state lithium battery external pressure dynamic control system of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1—Servo motor; 2—Reducer; 3—Lead screw;

[0026] 4—Upper base plate; 5—Support rod; 6—Lower base plate;

[0027] 7—Lead screw; 8—Pressure plate; 9—Pressure sensor;

[0028] 10—Pressure lever; 11—Motion control card; 12—Data acquisition card;

[0029] 13—All-solid-state lithium battery; 14—Battery cycle tester; 15—Transmitter;

[0030] 16—Computer; 17—Upper limit switch; 18—Lower limit switch. Detailed Implementation

[0031] like Figure 1 and Figure 3 As shown, the present invention discloses a dynamic control system for external pressure of an all-solid-state lithium battery, comprising a folding servo cylinder. The folding servo cylinder comprises a servo motor 1, a reducer 2, and a lead screw 3 connected in sequence. An upper base plate 4 is fixedly installed on the lower part of the lead screw 3. Four support rods 5 are provided on the lower part of the upper base plate 4. The lower part of the four support rods 5 is connected to a lower base plate 6. The lead screw 7 of the lead screw 3 passes through the upper base plate 4. A pressure plate 8 and a pressure sensor 9 are arranged in sequence on the part of the lead screw 7 that passes through the upper base plate 4. A pressure rod 10 is provided below the pressure sensor 9. The servo motor 1 and the pressure sensor 9 are respectively connected to the motion control card 11 and the acquisition card 12 of the main control center.

[0032] It should be noted that by setting up a reciprocating servo electric cylinder, the servo motor 1 is mainly used to control the lead screw 7 and pressure rod 10 of the lead screw 3 to apply pressure to the all-solid-state lithium battery 13 by applying displacement, thereby realizing single-axis pressure on the all-solid-state lithium battery 13. By setting up a reducer 2, the displacement speed is controlled to prevent excessive pressure. The pressure rod 10 is made of stainless steel, which has high strength and is used to apply greater pressure.

[0033] It should be noted that by setting the upper base plate 4, four support rods 5 and the lower base plate 6, a space for installing the all-solid-state lithium battery 13 is formed under the lead screw 3, which facilitates the pressurization of the all-solid-state lithium battery 13.

[0034] It should be noted that the pressure is tested when the pressure bar 10 applies pressure to the all-solid-state lithium battery 13 by setting the pressure plate 8 and the pressure sensor 9.

[0035] It should be noted that by connecting the servo motor 1 to the motion control card 11 of the main control center, the motion of the servo motor 1 is controlled by the motion control card 11, thereby controlling the displacement of the lead screw 3 and the pressure on the all-solid-state lithium battery 13. The pressure sensor 9 is connected to the acquisition card 12 of the main control center to monitor the pressure on the all-solid-state lithium battery 13 in real time.

[0036] It should be noted that the main control center is equipped with an emergency stop button, which will immediately stop the control system in case of a malfunction.

[0037] It should be noted that the pressure sensor 9 is model SBT710-2T, the motion control card 11 is model net:DAQ1608, the data acquisition card 12 is model NET6043-S2, and the transmitter 15 is model SBT904.

[0038] like Figure 2 and Figure 3 As shown, in this embodiment, a solid-state lithium battery 13 is mounted on the lower base plate 6. The solid-state lithium battery 13 is connected to a battery cycle tester 14 and a data acquisition card 12 of the main control center. By connecting the solid-state lithium battery 13 to the battery cycle tester 14, the solid-state lithium battery 13 is cycled under pressure to test its performance under external pressure. The data acquisition card 12 collects the performance data of the solid-state lithium battery 13.

[0039] It should be noted that the battery cycle tester 14 is a Xinwei battery cycle tester.

[0040] like Figure 3As shown, in this embodiment, the pressure sensor 9 is connected to the transmitter 15 of the main control center, and the transmitter 15 is connected to the data acquisition card 12 of the main control center. By setting the transmitter 15 to amplify the signal detected by the pressure sensor 9, and by connecting the transmitter 15 to the data acquisition card 12, it is convenient to read the pressure detected by the pressure sensor 9.

[0041] like Figure 3 As shown, in this embodiment, both the motion control card 11 and the data acquisition card 12 are connected to the computer 16. By connecting the motion control card 11 and the data acquisition card 12 to the computer 16, the data acquisition card 12 is used to monitor the real-time voltage and pressure of the all-solid-state lithium battery 13 and read the data from the computer. The computer then controls the motion control card 11 to control the folding servo electric cylinder to apply pressure, thus achieving real-time voltage and pressure monitoring of the all-solid-state lithium battery 13 while applying pressure.

[0042] In this embodiment, a groove for mounting the all-solid-state lithium battery 13 is provided on the lower base plate 6, and the groove corresponds to the position of the pressure rod 10. By providing a groove on the lower base plate 6, the all-solid-state lithium battery 13 can be quickly positioned, ensuring that the all-solid-state lithium battery 13 is located below the pressure rod 10, and limiting the position of the all-solid-state lithium battery 13.

[0043] like Figure 1 As shown, in this embodiment, the lead screw 3 is equipped with an upper limit switch 17 and a lower limit switch 18, and the lead screw 7 is equipped with a magnetic ring that cooperates with the upper limit switch 17 and the lower limit switch 18. The upper limit switch 17 and the lower limit switch 18 are connected to the main control center. By setting the magnetic ring on the lead screw 7 to cooperate with the upper limit switch 17 and the lower limit switch 18 on the lead screw 3, when the magnetic ring on the lead screw 7 moves to the upper limit switch 17 or the lower limit switch 18, the switch will automatically close, transmitting a signal to the main control center, thereby stopping the movement of the servo motor 1. This is used to set the maximum displacement value and prevent mechanical damage.

[0044] In this embodiment, the lead screw 3 and the upper base plate 4 are connected by bolts through the screw holes at the bottom of the lead screw 3. By connecting the lead screw 3 and the upper base plate 4 with bolts, the connection between the two is ensured to be stable, and the connection can remain stable even under subsequent pressure.

[0045] In this embodiment, the pressure plate 8 and the pressure sensor 9 are the same size, and the pressure sensor 9 is fixed to the pressure plate 8 by bolts. By making the pressure plate 8 and the pressure sensor 9 the same size, it is convenient to fix the pressure sensor 9 to the pressure plate 8 by bolts.

[0046] In actual use, the all-solid-state lithium battery 13 is connected to the battery cycle tester 14 and the data acquisition card 12 respectively and placed in the groove of the bottom plate 6. At the same time, the parameters of the battery cycle tester 14 are set to automatically cycle the all-solid-state lithium battery. The voltage signal of the all-solid-state lithium battery 13 collected by the data acquisition card 12 is transmitted to the computer 16. Based on the voltage signal, the parameters of the servo motor 1 are set by the computer 16 and the motion control card 11 to control the pressure, displacement and movement speed of the pressure rod 10. Then, the battery cycle tester 14 sets the required process for the all-solid-state lithium battery 13 to cycle. The all-solid-state lithium battery 13 can then cycle automatically under program control. When the upper limit cutoff voltage is reached, the motion control card 11 of the main control center automatically controls the pressure rod 10 to increase / decrease the external pressure according to the set pressure and the running speed of the pressure rod 10. When the lower limit cutoff voltage is reached, the motion control card 11 of the main control center controls the pressure rod 10 to automatically decrease / increase the external pressure, thereby realizing the dynamic regulation of the external pressure of the all-solid-state lithium battery 13.

[0047] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A dynamic external pressure control system for an all-solid-state lithium battery, characterized in that, The system includes a reciprocating servo cylinder, which includes a servo motor (1), a reducer (2) and a lead screw (3) connected in sequence. An upper base plate (4) is fixedly installed on the lower part of the lead screw (3). Four support rods (5) are provided on the lower part of the upper base plate (4). The lower part of the four support rods (5) is connected to a lower base plate (6). The lead screw (7) of the lead screw (3) passes through the upper base plate (4). A pressure plate (8) and a pressure sensor (9) are arranged in sequence on the part of the lead screw (7) that passes through the upper base plate (4). A pressure rod (10) is provided on the lower part of the pressure sensor (9). The servo motor (1) and the pressure sensor (9) are respectively connected to the motion control card (11) and the acquisition card (12) of the main control center.

2. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, A solid-state lithium battery (13) is installed on the lower base plate (6), and the solid-state lithium battery (13) is connected to a battery cycle tester (14) and a data acquisition card (12) of the main control center.

3. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, The pressure sensor (9) is connected to the transmitter (15) of the main control center, and the transmitter (15) is connected to the acquisition card (12) of the main control center.

4. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, Both the motion control card (11) and the acquisition card (12) are connected to the computer (16).

5. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, The bottom plate (6) has a groove for installing a solid-state lithium battery (13), and the groove corresponds to the position of the pressure rod (10).

6. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, The lead screw (3) is equipped with an upper limit switch (17) and a lower limit switch (18). The lead screw (7) is equipped with a magnetic ring that cooperates with the upper limit switch (17) and the lower limit switch (18). The upper limit switch (17) and the lower limit switch (18) are connected to the motion control card (11) of the main control center.

7. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, The lead screw (3) and the upper base plate (4) are connected by bolts through the screw holes at the bottom of the lead screw (3).

8. The all-solid-state lithium battery external pressure dynamic control system according to claim 1, characterized in that, The pressure plate (8) and the pressure sensor (9) are the same size, and the pressure sensor (9) is fixed to the pressure plate (8) by bolts.

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