Device and method for isostatic pressure regulation of solid-state battery pressure

Abstract

This invention discloses an isostatic pressure regulating device and method for solid-state batteries, belonging to the field of power battery technology for new energy vehicles. The device includes a gas compression chamber, in which a piston rod is installed in each cavity. A vent flange is fixed to the upper end of the gas compression chamber, and a battery mounting plate is fixed to the upper end of the vent flange. The battery mounting plate has multiple battery cavities corresponding to the cavities, and solid-state batteries are placed in them. The vent flange and the battery mounting plate are electrically connected. A venting cover is provided above the battery mounting plate to seal the top of the battery cavities. A control circuit unit and a drive motor are installed at the bottom of the frame housing. The control circuit unit controls the speed and torque of the drive motor and can transmit the torque of the drive motor to the piston rod through a torque transmission unit. A pressure sensor is provided on the venting cover to monitor the pressure inside the battery cavities and feeds back the pressure data as an input signal to the control circuit unit to adjust the torque of the drive motor.

Description

Technical Field

[0001] This invention belongs to the field of power battery technology for new energy vehicles, specifically relating to a device and method for isostatically regulating the pressure of solid-state batteries. Background Technology

[0002] All-solid-state batteries are considered a strong candidate for next-generation energy storage technology due to their high energy density and high safety. Within all-solid-state batteries, all interfaces are solid-solid contacts. Due to the lack of liquid electrolyte wetting, interface stability issues are prone to occur. These problems lead to increased interface impedance, reduced lithium-ion transport efficiency, and capacity decay, becoming bottlenecks in the commercialization of all-solid-state batteries. Research shows that applying appropriate stacking pressure to all-solid-state batteries is crucial for ensuring interfacial contact between components, ultimately improving battery performance under real-world operating conditions. Furthermore, the commercialization of all-solid-state lithium metal batteries requires applying relatively low stacking pressure during actual operation; excessive stacking pressure may damage the structural integrity of component materials and even degrade battery performance. However, traditional uniaxial battery clamps face several challenges, particularly in adapting to electrode volume changes, providing uniform pressure distribution, and maintaining consistent pressure over long periods. Existing clamp designs cannot fully meet the demands for precise and stable pressure control in battery research. Moreover, the rubber and spring materials used in traditional clamps may be susceptible to material fatigue, meaning that the applied force may gradually decrease over time, affecting battery performance and test results. Therefore, an isostatic pressure control device for solid-state batteries is proposed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide an isostatic pressure regulating device and method for solid-state batteries, thereby solving the problems in the prior art.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A device for isostatic pressure regulation of solid-state battery pressure includes a frame housing, a gas compression chamber with multiple chambers, each chamber housing a piston rod; a vent flange is fixed to the upper end of the gas compression chamber, and a battery mounting plate is fixed to the upper end of the vent flange; the battery mounting plate has multiple battery chambers corresponding to the chambers, and solid-state batteries are placed in the battery chambers; through holes are provided on both the vent flange and the battery mounting plate for communication; a vent cover is provided above the battery mounting plate, which can seal the top of the battery chambers.

[0006] The bottom of the frame housing is equipped with a control circuit unit and a drive motor. The control circuit unit, which encapsulates an inverter and a rectifier, is used to control the speed and torque of the drive motor. The frame housing is equipped with a torque transmission unit, which can transmit the torque of the drive motor to the piston rod and drive the piston tube to move up and down.

[0007] A pressure sensor is installed on the ventilation cover to monitor the pressure inside the battery cavity and feed the pressure data back to the control circuit unit as an input signal to adjust the torque of the drive motor.

[0008] Furthermore, the ventilation cover is fastened to the ventilation flange and the battery mounting plate by locking bolts.

[0009] Furthermore, a cooling unit is provided at the upper end of the battery mounting plate. The cooling unit includes a ring-shaped cooling water channel and multiple cooling fins arranged on the battery mounting plate and evenly distributed circumferentially. The cooling water channel passes through the multiple cooling fins to remove the heat generated by the solid-state battery during operation.

[0010] Furthermore, the solid-state battery is wrapped with an aluminum-plastic film on its outer side.

[0011] Furthermore, a compression spring is provided between the ventilation cover and the battery mounting plate. The compression spring is sleeved on the outside of the locking bolt, and both ends of the compression spring are in contact with the ventilation cover and the battery mounting plate, respectively.

[0012] Furthermore, the vent flange is embedded in each of the cavities.

[0013] Furthermore, the number of battery cavities and cavities is 6 each.

[0014] Furthermore, the control circuit unit encapsulates an ANN to directly perform torque control. The control process is as follows:

[0015] First, the pressure data fed back by the pressure sensor is converted into the target torque and actual torque required by the drive motor;

[0016] Next, the error between the target torque required in the battery cavity and the actual torque is calculated. After estimating the rotor flux and stator flux using an ANN, the calculated torque error and flux error are input into the ANN to obtain the control signal.

[0017] Finally, the actual torque and magnetic flux of the drive motor are fed back to the control circuit unit for error calculation, thereby achieving real-time pressure control.

[0018] Furthermore, the torque transmission unit includes an intermediate gear, a gear pair, a concave roller, and a rack; a drive gear is fixed on the drive shaft of the drive motor and meshes with the intermediate gear; the intermediate gear meshes with gear pairs composed of different numbers of teeth, the number of teeth of the intermediate gear is greater than the number of teeth of the drive gear, the number of teeth at the large end of the gear pair is greater than the number of teeth of the intermediate gear, and the small end meshes with the rack, and the torque is amplified by different gear ratios; the bottom end of the piston rod is fixedly connected to the rack, and the concave roller cooperates with the convex rod on the outer side of the rack.

[0019] A method for isostatically regulating the pressure of a solid-state battery, using the aforementioned isostatically regulating solid-state battery pressure apparatus, includes the following steps:

[0020] S1 uses the pressure data fed back by the pressure sensor to convert the target torque and actual torque required by the drive motor.

[0021] S2, calculate the error between the target torque required in the battery cavity and the actual torque;

[0022] S3, use ANN to estimate rotor flux and stator flux;

[0023] S4, calculate torque error and flux error;

[0024] S5, input the torque error and flux error into ANN to obtain the control signal;

[0025] S6 performs space vector modulation based on the control signal to generate the inverter's switching signal;

[0026] S7, the inverter generates corresponding voltage and current according to the switching signal to drive the drive motor;

[0027] S8, the rectifier converts AC power into DC power and supplies it to the DC bus;

[0028] S9, the actual torque and magnetic flux of the drive motor are fed back to the control circuit unit for error calculation; the control circuit unit continuously cycles to achieve real-time pressure control.

[0029] The beneficial effects of this invention are:

[0030] 1. Unlike traditional single-axis clamps, this battery pressure regulation device uses gas as a pressurizing medium to achieve uniform pressure on the battery from all 360 degrees.

[0031] 2. The device is designed with multiple battery chambers, each of which operates independently and can accommodate different types of batteries. Through the circuit system, it can better achieve simultaneous regulation of battery pressure under different operating conditions.

[0032] 3. By constructing ANN-based direct torque control, the torque required for the motor to adapt to the pressure inside the battery cavity is obtained, which is more robust than the traditional motor torque control system.

[0033] 4. Batteries generate heat during use. This device uses a combination of cooling plates and water cooling, which can more efficiently control the temperature of the battery inside the cavity compared to natural cooling and forced air cooling, and promptly remove excess heat generated by the battery during operation.

[0034] 5. The transmission device of this battery unit adopts a reduction gear design, which further improves the transmission torque on the basis of the high torque of the motor, and can better drive the piston to change the air pressure inside the cavity.

[0035] 6. The components used in the entire device have simple structures, and some parts can be purchased directly from the market. There are no special processes, so the cost is low. It can achieve high-standard functional requirements at a low cost and is easy to mass-produce. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a three-dimensional view of the overall structure of the isostatic pressure regulating solid-state battery pressure device of the present invention.

[0038] Figure 2 This is a top view of the cavity where the battery is stored and the surrounding cooling device of the present invention;

[0039] Figure 3 This is a perspective view of the vent flange connecting the gas compression chamber in this invention;

[0040] Figure 4 This is a perspective view of the torque transmission unit in this invention;

[0041] Figure 5 This is a perspective view of the pressure sensor in this invention;

[0042] Figure 6 This is a perspective view of the solid-state battery in this invention;

[0043] Figure 7 This is the control flowchart of the control circuit unit in this invention.

[0044] In the diagram: 1-Frame housing, 2-Control circuit unit, 3-Torque transmission unit, 4-Gas compression chamber, 5-Piston rod, 6-Fasting screw, 7-Ventilation flange, 8-Battery mounting plate, 9-Compression spring, 10-Pressure sensor, 11-Ventilation cover, 12-Solid-state battery, 13-Cooling water channel, 14-Cooling fin; 15-Gear pair, 16-Drive motor, 17-Concave roller, 18-Rack, 19-Intermediate gear. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1

[0047] like Figures 1 to 3 As shown, an isostatic pressure regulating device for solid-state batteries includes a frame housing 1. A gas compression chamber 4 is provided on the frame housing 1, and the gas compression chamber 4 includes multiple chambers, each containing a piston rod 5. A vent flange 7 is fixed to the upper end of the gas compression chamber 4, and a battery mounting plate 8 is fixed to the upper end of the vent flange 7. The battery mounting plate 8 has multiple battery chambers, each containing a solid-state battery 12, with each battery chamber corresponding to one of the chambers. Both the vent flange 7 and the battery mounting plate 8 have through holes to ensure that gas can enter and exit the battery chambers when the piston rod 5 moves up and down. A vent cover 11 is provided above the battery mounting plate 8, and the vent cover 11 is fastened to the vent flange 7 and the battery mounting plate 8 by locking bolts 6, and the vent cover 11 can seal the top of the battery chambers. By controlling the movement of the piston rod 5, the internal pressure of the battery chambers can be adjusted, thereby regulating the pressure on the solid-state batteries.

[0048] The bottom of the frame housing 1 is equipped with a control circuit unit 2 and a drive motor 16. The internal chip of the control circuit unit 2 is connected to the drive motor 16 and is used to send and receive signals to control the speed and torque of the drive motor. The frame housing 1 is also equipped with a torque transmission unit 3, which is a reduction mechanism that can transmit the torque of the drive motor to the piston rod 5 and drive the piston tube 5 to rise and fall. The control circuit unit 2 can control the rising and falling speed and rising and falling pressure of the piston rod 5 by controlling the speed and torque of the bottom drive motor 16.

[0049] The control circuit unit 2 contains an inverter and a rectifier, which are used to control the speed and torque of the drive motor 16.

[0050] Multiple pressure sensors 10 are installed on the ventilation cover 11, such as Figure 5 As shown, the pressure sensor 10 can monitor the pressure inside the battery cavity; the pressure sensor 10 can sensitively react to the pressure changes inside the battery cavity, and by combining with the control circuit unit 2, it uses the pressure data inside the battery cavity as an input signal to feed back to the chip in the control circuit unit 2 to adjust the torque of the drive motor.

[0051] The control circuit unit 2 encapsulates an artificial neural network (ANN) to directly control torque. Unlike traditional methods, this method does not require a speed controller, commutation table, and hysteresis comparator, thus enabling more precise adaptation to torque during battery pressure cycles.

[0052] like Figure 7 As shown, the process of regulating the drive motor torque by the control circuit unit 2 is as follows: First, the pressure data fed back by the pressure sensor 10 is converted into the target torque and actual torque required by the drive motor; then, the error between the target torque and the actual torque required in the battery cavity is calculated, and the rotor flux and stator flux are estimated using an ANN. The calculated torque error and flux error are then input into the ANN to obtain the control signal; finally, the actual torque and flux of the drive motor are fed back to the control circuit unit for error calculation, thereby realizing real-time pressure control.

[0053] In this embodiment, as Figure 4 As shown, the torque transmission unit 3 includes an intermediate gear 19, a gear pair 15, a concave roller 17, and a rack 18. A drive gear is fixed on the drive shaft of the drive motor 16 and meshes directly with the intermediate gear 19. The intermediate gear 19 meshes with gear pairs 15 composed of different numbers of teeth; the intermediate gear 19 has more teeth than the drive gear, and the large end of the gear pair 15 has more teeth than the intermediate gear 19. The small end meshes with the rack 18, amplifying the torque through different gear ratios. The bottom end of the piston rod 5 is fixedly connected to the rack 18, and the concave roller 17 cooperates with the convex rod on the outer side of the rack 18 to achieve precise guidance. Finally, driven by the motor, the piston rod 5 reciprocates.

[0054] like Figure 2 As shown, a cooling unit is provided at the upper end of the battery mounting plate 8. The cooling unit includes a ring-shaped cooling water channel 13 and multiple cooling fins 14 arranged on the battery mounting plate 8 and evenly distributed in the circumference. The cooling water channel 13 passes through the multiple cooling fins 14, thereby removing the heat generated by the solid-state battery 12 during operation and ensuring the normal operation of the battery.

[0055] In this embodiment, as Figure 6 As shown, the solid-state battery 12 is wrapped with an aluminum-plastic film.

[0056] In this embodiment, a plurality of compression springs 9 are provided between the ventilation cover 11 and the battery mounting plate 8. The compression springs 9 are sleeved on the outside of the locking bolt 6, and the two ends of the compression springs 9 are in contact with the ventilation cover 11 and the battery mounting plate 8 respectively. The compression springs 9 can balance the contact between the ventilation cover 11 and the battery cavity, and also play a certain supporting role.

[0057] In this embodiment, the vent flange 7 is embedded in each cavity, which can perfectly fit the cavity opening; the number of battery cavities and cavities is 6; the piston surface of the piston rod 5 is made of rubber material to ensure good sealing inside the cavity.

[0058] Example 2

[0059] Based on the isostatic pressure regulating device for solid-state batteries proposed in Embodiment 1, this embodiment proposes a method for isostatic pressure regulating solid-state battery pressure, such as... Figure 7 As shown, it includes the following steps:

[0060] S1 converts the pressure signal fed back by the pressure sensor into a digital signal, and determines the linear or nonlinear relationship between pressure and torque through experimental calibration, thereby obtaining the target torque and actual torque required by the drive motor;

[0061] S2, calculate the error between the target torque required in the battery cavity and the actual torque;

[0062] There is a linear relationship between pressure and torque: T = k·P + b, where T is torque, P is pressure, k and b are coefficients obtained through experimental calibration, and the error e = target torque - actual torque.

[0063] S3 uses the nonlinear fitting capability of ANN to estimate the rotor flux and stator flux from the input pressure, motor current, speed, etc.

[0064] S4, calculate torque error and flux error;

[0065] Calculate the estimated magnetic flux value Φ based on the voltage or current model of the drive motor. est The actual magnetic flux value Φ is obtained by integrating the back electromotive force. act Magnetic flux error = estimated value Φ est - Actual value Φ act .

[0066] S5, input the torque error and flux error into ANN to obtain the control signal;

[0067] S6 performs space vector modulation based on the control signal to generate the inverter's switching signal;

[0068] S7, the inverter generates corresponding voltage and current according to the switching signal to drive the drive motor;

[0069] S8, the rectifier converts AC power into DC power and supplies it to the DC bus;

[0070] S9, the actual torque and magnetic flux of the drive motor are fed back to control circuit unit 2 for error calculation; control circuit unit 2 continuously cycles to achieve real-time pressure control.

[0071] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A device for isostatic pressure regulation of solid-state battery pressure, comprising a frame housing (1), characterized in that, A gas compression chamber (4) is provided on the frame housing (1). The gas compression chamber (4) includes multiple chambers, and a piston rod (5) is installed in each chamber. A vent flange (7) is fixed at the upper end of the gas compression chamber (4). A battery mounting plate (8) is fixed at the upper end of the vent flange (7). Multiple battery chambers corresponding to the chambers are provided in the battery mounting plate (8), and solid-state batteries (12) are placed therein. Through holes are opened on both the vent flange (7) and the battery mounting plate (8) and are open to conduct electricity. A ventilation cover plate (11) is provided above the battery mounting plate (8) and can seal the top of the battery chamber. The bottom of the frame housing (1) is equipped with a control circuit unit (2) and a drive motor (16). The control circuit unit (2) contains an inverter and a rectifier, which are used to control the speed and torque of the drive motor (16). The frame housing (1) is equipped with a torque transmission unit (3), which can transmit the torque of the drive motor to the piston rod (5) and drive the piston rod (5) to rise and fall. A pressure sensor (10) is installed on the ventilation cover (11) to monitor the pressure inside the battery cavity and feed the pressure data back to the control circuit unit (2) as an input signal to adjust the torque of the drive motor (16).

2. The device for isostatic pressure regulation of solid-state battery pressure according to claim 1, characterized in that, The ventilation cover (11) is fastened to the ventilation flange (7) and the battery mounting plate (8) by locking bolts (6).

3. The device for isostatic pressure regulation of a solid-state battery according to claim 1, characterized in that, The upper end of the battery mounting plate (8) is provided with a cooling unit. The cooling unit includes a ring-shaped cooling water channel (13) and multiple cooling fins (14) arranged on the battery mounting plate (8) and evenly distributed in the circumference. The cooling water channel (13) passes through the multiple cooling fins (14) to carry away the heat generated by the solid-state battery (12) during operation.

4. The device for isostatic pressure regulation of a solid-state battery according to claim 1, characterized in that, The solid-state battery (12) is wrapped with an aluminum-plastic film.

5. The device for isostatic pressure regulation of a solid-state battery according to claim 1, characterized in that, A compression spring (9) is provided between the ventilation cover (11) and the battery mounting plate (8). The compression spring (9) is sleeved on the outside of the locking bolt (6), and the two ends of the compression spring (9) are in contact with the ventilation cover (11) and the battery mounting plate (8) respectively.

6. The device for isostatic pressure regulation of solid-state battery pressure according to claim 1, characterized in that, The vent flange (7) is embedded in each of the cavities.

7. The device for isostatic pressure regulation of solid-state battery pressure according to claim 1, characterized in that, The number of battery cavities and cavities is 6 each.

8. The device for isostatic pressure regulation of solid-state battery pressure according to claim 1, characterized in that, The control circuit unit (2) encapsulates an ANN to directly perform torque control. The control process is as follows: First, the pressure data fed back by the pressure sensor (10) is converted into the target torque and actual torque required by the drive motor; Next, the error between the target torque required in the battery cavity and the actual torque is calculated. After estimating the rotor flux and stator flux using an ANN, the calculated torque error and flux error are input into the ANN to obtain the control signal. Finally, the actual torque and magnetic flux of the drive motor are fed back to the control circuit unit (2) for error calculation, thereby realizing real-time pressure control.

9. The device for isostatic pressure regulation of a solid-state battery according to claim 1, characterized in that, The torque transmission unit (3) includes an intermediate gear (19), a gear pair (15), a concave roller (17), and a rack (18); the drive shaft of the drive motor (16) is fixed with a drive gear and meshes with the intermediate gear (19). The intermediate gear (19) meshes with gear pairs (15) composed of different numbers of teeth. The number of teeth of the intermediate gear (19) is greater than the number of teeth of the drive gear. The number of teeth at the large end of the gear pair (15) is greater than the number of teeth of the intermediate gear (19). The small end meshes with the rack (18) and amplifies the torque through different gear ratios. The bottom end of the piston rod (5) is fixedly connected to the rack (18), and the concave roller (17) cooperates with the convex rod on the outside of the rack (18).

10. A method for isostatically regulating the pressure of a solid-state battery, using the isostatically regulating solid-state battery pressure apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: S1 uses the pressure data fed back by the pressure sensor to convert the target torque and actual torque required by the drive motor. S2, calculate the error between the target torque required in the battery cavity and the actual torque; S3, use ANN to estimate rotor flux and stator flux; S4, calculate torque error and flux error; S5, input the torque error and flux error into ANN to obtain the control signal; S6 performs space vector modulation based on the control signal to generate the inverter's switching signal; S7, the inverter generates corresponding voltage and current according to the switching signal to drive the drive motor; S8, the rectifier converts AC power into DC power and supplies it to the DC bus; S9, the actual torque and magnetic flux of the drive motor are fed back to the control circuit unit (2) for error calculation; the control circuit unit (2) continuously cycles to achieve real-time pressure control.

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