Solid-state battery pressure control method, device, medium, vehicle, and apparatus

Abstract

The present application provides a solid-state battery pressure control method, a device, a medium, a vehicle, and an apparatus. The method comprises: acquiring an operating state of a solid-state battery, the operating state comprising a working state and a sleep state; and when it is determined that the solid-state battery has entered the sleep state from the working state and the solid-state battery has withstood a preset pressure value corresponding to the working state, generating a depressurization instruction so as to reduce the pressure value corresponding to the solid-state battery in the sleep state.

Description

Solid-state battery pressure control method, device, medium, vehicle and apparatus

[0001] This application claims priority to the Chinese patent application No. 202411074853.X, filed on August 6, 2024, and titled "Solid-state battery pressure control method, device, medium, vehicle and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of automobiles, and in particular to a solid-state battery pressure control method, an electronic device, a computer readable medium, a vehicle and a solid-state battery apparatus. BACKGROUND

[0003] A solid-state battery is composed of inorganic solid materials, and it is necessary to ensure that the active particles in the solid-state battery are in close contact, so that the solid-state battery can achieve high discharge efficiency.

[0004] At present, for the solid-state battery, physical pressure can be applied to the solid-state battery, for example, the battery is extruded, so that the contact between the active particles in the battery is more close.

[0005] However, in the current scheme, the solid-state battery is continuously subjected to physical pressure, and because the self-discharge of the solid-state battery itself is large, when the active particles are in close contact, the self-discharge is high, which accelerates the battery loss. SUMMARY

[0006] The embodiments of the present application provide a solid-state battery pressure control method, an electronic device, a computer readable medium, a vehicle and a solid-state battery apparatus to solve the problem that the battery is continuously subjected to pressure in the prior art, resulting in battery loss.

[0007] In a first aspect, the embodiments of the present application provide a solid-state battery pressure control method, the method comprising:

[0008] obtaining an operating state of the battery; the operating state comprising a working state and a sleep state;

[0009] In a case where it is determined that the battery enters the sleep state from the working state and the battery is subjected to a preset pressure value corresponding to the working state, a pressure reduction instruction is generated to reduce a pressure value corresponding to the sleep state of the battery.

[0010] Optionally, the step of obtaining the operating state of the battery comprises:

[0011] obtaining an electrical parameter of the battery; the electrical parameter being used to indicate the operating state of the battery;

[0012] determining the operating state of the battery according to the electrical parameter.

[0013] Optionally, the step of generating the decompression instruction in the case that the battery is determined to enter the dormant state from the working state and the battery bears the preset pressure value corresponding to the working state comprises:

[0014] In the case that the battery is determined to enter the dormant state from the working state and the battery bears the preset pressure value corresponding to the working state, a performance parameter of the battery is acquired; the performance parameter represents a power supply capability of the battery;

[0015] According to the performance parameter, a first target pressure value corresponding to the dormant state is calculated;

[0016] The decompression instruction carrying the first target pressure value is generated; the preset pressure value is a physical pressure borne by the battery before decompression, and the first target pressure value is a physical pressure borne by the battery after decompression.

[0017] Optionally, the electrical parameter comprises a current parameter;

[0018] The step of generating the decompression instruction in the case that the battery is determined to enter the dormant state from the working state and the battery bears the preset pressure value corresponding to the working state comprises:

[0019] In the case that the current parameter continuously is less than a preset current threshold and a duration reaches a preset first time length, it is determined that the battery enters the dormant state from the working state;

[0020] In the case that the battery is in the dormant state and the battery bears the preset pressure value corresponding to the working state, the decompression instruction is generated.

[0021] Optionally, the step of generating the decompression instruction in the case that the battery is in the dormant state and the battery bears the preset pressure value corresponding to the working state comprises:

[0022] In the case that the battery is in the dormant state and at least one pressure value of the battery is greater than the preset pressure value, it is determined that the battery bears the preset pressure value corresponding to the working state;

[0023] In the case that a fluctuation value of the at least one pressure value continuously is less than a preset fluctuation threshold and a duration reaches a preset second time length, the decompression instruction is generated.

[0024] Optionally, the method further comprises:

[0025] An ascension rate of the battery is acquired;

[0026] In a case where the temperature rising rate reaches a preset rate threshold, a pressure reduction instruction is generated.

[0027] Optionally, after the step of generating the pressure reduction instruction to reduce the corresponding pressure value of the battery in the sleep state, the method further comprises:

[0028] In a case where it is determined that the battery enters the working state from the sleep state, a pressure increase instruction is generated to increase the corresponding pressure value of the battery in the working state.

[0029] Optionally, the step of generating the pressure increase instruction in a case where it is determined that the battery enters the working state from the sleep state comprises:

[0030] In a case where it is determined that the battery enters the working state from the sleep state, a second target pressure value is determined based on the preset pressure value and a preset expansion parameter; the second target pressure value is greater than the preset pressure value.

[0031] A pressure increase instruction carrying the preset pressure value, the second target pressure value and a preset third time length is generated to apply a physical pressure corresponding to the second target pressure value to the battery, and after the preset third time length ends, a physical pressure corresponding to the preset pressure value is applied to the battery.

[0032] In a second aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory.

[0033] The memory is used to store a computer program.

[0034] The processor is used to execute the program stored in the memory, and implement the steps in the solid-state battery pressure control method of the first aspect.

[0035] In a third aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program. The program is executed by a processor to implement the steps in the solid-state battery pressure control method of the first aspect.

[0036] In a fourth aspect, an embodiment of the present application provides a vehicle, comprising the electronic device of the second aspect.

[0037] In a fifth aspect, an embodiment of the present application provides a solid-state battery device, comprising the electronic device of the second aspect.

[0038] Compared with the prior art, the present application has the following advantages:

[0039] In the embodiment of the present application, by acquiring the running state of the battery, in the case that the battery enters the sleep state from the working state and the battery bears the preset pressure value corresponding to the working state, a pressure reduction instruction is generated, which can reduce the pressure of the battery in the sleep state. Avoids the battery loss caused by continuous pressure on the basis of the characteristics of large self-discharge of solid-state batteries, improves the battery life, and reduces the battery loss.

[0040] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment description will be briefly introduced.

[0042] Fig. 1 is a step schematic diagram of a solid-state battery pressure control method provided by the embodiment of the present application;

[0043] Fig. 2 is a structural schematic diagram of a clamping plate, a bottom plate and a battery provided by the embodiment of the present application;

[0044] Fig. 3 is a step schematic diagram of another solid-state battery pressure control method provided by the embodiment of the present application;

[0045] Fig. 4 is a schematic diagram of pressure increase and decrease provided by the embodiment of the present application;

[0046] Fig. 5 is a schematic diagram of a pressure control architecture provided by the embodiment of the present application;

[0047] Fig. 6 is a block diagram of an electronic device provided by the embodiment of the present application.

[0048] Marked with a figure: 200-battery pack; 201-clamping plate; 202-bottom plate; 203-solid-state battery; 204-positive pole lug; 205-negative pole lug; 501-pressure controller; 502-pressure system; 503-vehicle control system; 506-temperature sensor and pressure sensor; 600-electronic device; 601-processor; 602-communication interface; 603-memory; 604-communication bus. DETAILED DESCRIPTION

[0049] The exemplary embodiments of the present application will be described in more detail by referring to the attached drawings. Although the exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be accurately conveyed to those skilled in the art.

[0050] Currently in the solid-state battery industry, the interface problem of liquid solid-state battery under the electrolyte system is not prominent. When the material expands and shrinks during the operation of the solid-state battery, the electrolyte can adapt to the volume change, and there is no physical electrical connection between the material and the electrolyte caused by the volume change, that is, there is no interface problem.

[0051] And the solid-state battery of the present application can refer to a solid-state battery such as a full solid-state battery. The solid-state battery refers to a solid-state battery in which a liquid electrolyte is replaced by a solid-state electrolyte material. Compared with traditional solid-state batteries, solid-state batteries can better avoid liquid leakage and explosion problems, and have higher electrical conductivity and stability, and can achieve higher energy density and faster charging and discharging rate.

[0052] Among them, the closer the active particles inside the solid-state battery, the higher the discharge efficiency of the solid-state battery. Therefore, it is necessary to maintain a continuous pressure during operation to ensure the contact and conduction of the active particles, and to avoid obvious interface problems. On the other hand, due to the electrical conductivity of the solid-state electrolyte being significantly higher than that of the electrolyte, for example, the ionic conductivity of lithium sulfur phosphorus chlorine fast ion conductor (Li6PS5Cl) material is as high as 2 x 10 -10 Siemens per centimeter (S / cm), so that the self-discharge of the solid-state battery is larger, which leads to the self-discharge of the solid-state battery being much higher than that of the liquid solid-state battery under the electrolyte system, and further leads to the loss of the solid-state battery, so that the calendar life of the solid-state battery is much less than 10 years.

[0053] FIG. 1 is a step schematic diagram of a solid-state battery pressure control method according to an embodiment of the present application. The solid-state battery pressure control method is applied to a pressure controller 501 of a vehicle, the vehicle comprising a pressure system 502 and a solid-state battery 203, the pressure system 502 being configured to apply physical pressure to the solid-state battery 203; the method comprising:

[0054] Step 101, obtaining the running state of the solid-state battery 203; the running state comprising a working state and a sleep state;

[0055] In the embodiments of the present disclosure, the execution subject can be the pressure controller 501, which can be an electronic control unit in the solid-state battery device. The solid-state battery device can be a separate device and can supply power externally. The solid-state battery device can also be built-in in a vehicle, which is not specifically limited here. The pressure controller 501 can obtain the running state of the solid-state battery 203, including the working state and the sleep state. In the working state, the solid-state battery 203 outputs power externally, and in the sleep state, the solid-state battery 203 stops outputting power externally.

[0056] In step 102, in a case where it is determined that the solid-state battery 203 enters the sleep state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, a pressure reduction instruction is generated to reduce the pressure value corresponding to the sleep state of the solid-state battery 203.

[0057] In addition to determining that the solid-state battery 203 enters the sleep state from the working state, it is also necessary to determine that the preset pressure value corresponding to the working state is borne. At present, for the solid-state battery 203, physical pressure is continuously applied to make the active particles of the solid-state battery 203 more compact, thereby having a higher discharge efficiency when the solid-state battery 203 works. The physical pressure continuously borne by the solid-state battery 203 in the working state is usually not changed, and the physical pressure has a corresponding preset pressure value. The pressure controller 501 can also be connected with a pressure sensor on the solid-state battery 203 to determine the specific pressure value borne by the solid-state battery 203. The solid-state battery 203 can be fixed between the bottom plate 202 and the clamping plate 201, and the pressure sensor can be arranged between the clamping plate 201 and the solid-state battery 203. It can be understood that the solid-state battery 203 can also be pressed by other structures, which is not specifically limited here.

[0058] FIG. 2 is a structural schematic diagram of the clamping plate 201, the bottom plate 202, and the solid-state battery 203 provided by the embodiments of the present disclosure. The clamping plate 201 and the bottom plate 202 include the solid-state battery 203, and the pressure system 502 can apply physical pressure to the solid-state battery 203 from the right side.

[0059] The pressure sensor determines that the solid-state battery 203 currently bears the preset pressure value corresponding to the working state. Then, in a case where it is determined that the solid-state battery 203 enters the sleep state from the working state and the solid-state battery 203 bears the preset pressure value, a pressure reduction instruction is generated.

[0060] In the embodiments of the present disclosure, the pressure controller 501 can send a pressure reduction instruction to the pressure system 502. The pressure system 502 can be designed based on different mechanical structures and can apply physical pressure to the solid-state battery 203. The pressure system 502 receives the pressure reduction instruction and reduces the physical pressure applied to the solid-state battery 203, so that the physical pressure borne by the solid-state battery 203 starts to decrease on the basis of the preset pressure value corresponding to the working state. With the decrease of the pressure, the tightness between the active particles in the solid-state battery 203 decreases, the self-discharge decreases, and the loss of the solid-state battery 203 also decreases.

[0061] To sum up, in the embodiments of the present application, by acquiring the running state of the solid-state battery 203, in the case that the solid-state battery 203 enters the sleep state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, a pressure reduction instruction is generated to reduce the pressure corresponding to the sleep state of the solid-state battery 203. The loss of the solid-state battery 203 caused by the continuous pressure on the basis of the large self-discharge characteristic of the solid-state battery 203 is avoided, the service life of the solid-state battery 203 is improved, and the loss of the solid-state battery 203 is reduced.

[0062] The process of the solid-state battery pressure control method in the embodiments of the present application is described below with a specific implementation process. As shown in FIG. 3, the process includes the following steps:

[0063] In step 101, the running state of the solid-state battery 203 is acquired. The running state includes a working state and a sleep state.

[0064] In step 102, in the case that the solid-state battery 203 enters the sleep state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, a pressure reduction instruction is generated to reduce the pressure value corresponding to the sleep state of the solid-state battery 203.

[0065] The steps 101-102 described above can refer to the content of the embodiments of FIG. 1, which will not be described here.

[0066] Optionally, the step of acquiring the running state of the solid-state battery 203 includes:

[0067] In step 1011, the electrical parameter of the solid-state battery 203 is acquired. The electrical parameter is used to represent the running state of the solid-state battery 203.

[0068] In step 1012, the running state of the solid-state battery 203 is determined according to the electrical parameter.

[0069] In the embodiments of the present disclosure, the electrical parameter of the solid-state battery 203 is acquired, and the electrical parameter is used to represent the running state of the solid-state battery 203; the pressure controller 501 can be connected with the positive and negative electrode ports of the solid-state battery 203 to acquire the electrical parameter of the solid-state battery 203. The electrical parameter can be a voltage, a current or the like. When the solid-state battery 203 is running, the electrical parameter such as the current or the voltage can be variable or stable, and the current running state of the solid-state battery 203 can be determined according to the electrical parameter. For example, when the current of the solid-state battery 203 is 20-100 amperes (A), the solid-state battery 203 is in a working state.

[0070] In the embodiments of the present disclosure, according to the electrical parameter of the solid-state battery 203, it can be determined whether the solid-state battery 203 is in a working state or a sleep state. The working state and the sleep state of the solid-state battery 203 can be determined according to the value of the electrical parameter. For example, the current of the solid-state battery 203 is set to be in a range of 50 A-60 A, and then the solid-state battery 203 is in the working state. When the acquired current of the solid-state battery 203 is 55 A, it can be determined that the solid-state battery 203 is in the working state. When the acquired current decreases from 55 A to 1 milliampere (mA), it can be determined that the solid-state battery 203 enters the sleep state from the working state. In this case, the definition and the judgment condition of the working state and the sleep state are not specifically limited, and can be adjusted according to requirements.

[0071] Optionally, the step 102 of generating the pressure reduction instruction in the case that it is determined that the solid-state battery 203 enters the sleep state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, comprises:

[0072] The sub-step 1021 comprises: acquiring a performance parameter of the solid-state battery 203 in the case that it is determined that the solid-state battery 203 enters the sleep state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state; the performance parameter represents the power supply capability of the solid-state battery 203;

[0073] The sub-step 1022 comprises: calculating a first target pressure value corresponding to the sleep state according to the performance parameter;

[0074] The sub-step 1023 comprises: generating the pressure reduction instruction carrying the first target pressure value; the preset pressure value is the physical pressure borne by the solid-state battery 203 before pressure reduction, and the first target pressure value is the physical pressure borne by the solid-state battery 203 after pressure reduction.

[0075] In the embodiments of the present disclosure, the performance parameter is used to represent the power supply capability of the solid-state battery 203, and the performance parameter can be: a battery state of charge (SOC), a battery state of health (SOH), and a parameter related to the chemical system of the battery, such as a positive electrode material expansion rate, a Young's modulus, a negative electrode material expansion rate, a positive and negative electrode surface density, an electrolyte layer thickness, and the like, which are not specifically limited here.

[0076] The SOC of the battery can be determined in various ways. For the solid-state battery 203 with a slope charge-discharge curve, the SOC can be determined according to the stable open-circuit voltage of the battery. For the solid-state battery 203 with a long charge-discharge platform, the initial discharge capacity C0 of the battery is given, and the discharge capacity at each full charge and full discharge is updated. The difference between the cumulative charge and discharge of the solid-state battery 203 after full charging is calculated based on C0. The difference is subtracted from the self-discharge amount of the solid-state battery 203 during storage (which can be obtained by multiplying the given self-discharge rate by the storage time), and the SOC is calculated based on the ratio of the difference to C0. The specific parameters for calculating the SOC are not limited here.

[0077] The initial SOH can be set to 100%, and the SOH value of the solid-state battery 203 can be obtained by dividing the discharge capacity by the initial rated capacity C0 of the battery when the solid-state battery 203 is fully charged and discharged. The SOH can also be calculated in other ways, which are not limited here.

[0078] Based on one or more performance parameters described above, a first target pressure value corresponding to the hibernation state is calculated. The first target pressure value can be calculated by the following formula:

[0079] Wherein, m x a x C - b x H > 0, 0 ≤ m ≤ 1, 0 ≤ a ≤ 0.15, 0 ≤ b ≤ 0.01, C is the SOC of the solid-state battery 203, taking a value of 0-1, H is the SOH of the solid-state battery 203, taking a value of 0.7-1, and the specific value of m is related to the chemical system of the solid-state battery 203. P1 is the first target pressure value, and P0 is the preset pressure value corresponding to the working state.

[0080] The first target pressure value can be calculated based on the SOC, SOH, and parameters related to the chemical system of the solid-state battery 203. Then a pressure reduction instruction carrying the first target pressure value is generated, and the pressure system 502 can analyze the first target pressure value in the pressure reduction instruction, and then reduce the physical pressure borne by the solid-state battery 203 from the preset pressure value to the first target pressure value.

[0081] According to the performance parameter representing the power supply capability of the solid-state battery 203, a first target pressure value corresponding to the dormant state is calculated, and the pressure system 502 is used to reduce the physical pressure borne by the solid-state battery 203 from the preset pressure value to the first target pressure value. The performance parameter corresponding to the power supply capability of the solid-state battery 203 itself can be used to calculate a suitable first target pressure value, so as to obtain a suitable pressure reduction range, thereby improving the accuracy of pressure reduction.

[0082] Optionally, the electrical parameter includes a current parameter; and the step of generating the pressure reduction instruction in the case that the solid-state battery 203 enters the dormant state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state comprises:

[0083] In the case that the current parameter is less than a preset current threshold and the duration reaches a preset first time length, it is determined that the solid-state battery 203 enters the dormant state from the working state.

[0084] In the case that the solid-state battery 203 is in the dormant state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, the pressure reduction instruction is generated.

[0085] In the embodiments of the present disclosure, the electrical parameter can be a current parameter, for example, the size of the current value. The process of determining that the solid-state battery 203 enters the dormant state from the working state can continuously detect the current of the solid-state battery 203. If the current parameter is less than a preset current threshold (for example, 1 mA) and the duration reaches a preset first time length (for example, 3 hours), it is determined that the solid-state battery 203 enters the dormant state from the working state. The specific values of the preset current threshold and the preset first time length can be adjusted according to actual needs.

[0086] In the case that the solid-state battery 203 is determined to be in the dormant state according to the current parameter and the solid-state battery 203 bears the preset pressure value corresponding to the working state, the pressure reduction instruction can be generated.

[0087] According to the embodiments of the present disclosure, the solid-state battery 203 enters the dormant state from the working state by judging that the current parameter is less than a preset current threshold and the duration reaches a preset first time length. In the case that the solid-state battery 203 is in the dormant state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, the pressure reduction instruction is generated. The current solid-state battery 203 can be determined to be in the dormant state, and the solid-state battery 203 still bears a large preset pressure value, which belongs to a scenario that needs to be reduced in pressure. The pressure reduction instruction is generated in this scenario, thereby improving the accuracy of pressure reduction.

[0088] Optionally, the step of generating the pressure reduction instruction in the case that the solid-state battery 203 is in the dormant state and the solid-state battery 203 bears the preset pressure value corresponding to the working state comprises:

[0089] In the case that the at least one pressure value of the solid-state battery 203 is greater than the preset pressure value, it is determined that the solid-state battery 203 bears the preset pressure value corresponding to the working state.

[0090] In the case that the fluctuation value of the at least one pressure value is less than the preset fluctuation threshold for a preset second time length, the pressure reduction instruction is generated.

[0091] In the embodiments of the present disclosure, after it is determined that the solid-state battery 203 is in the dormant state according to the electrical parameter, at least one pressure value corresponding to the solid-state battery 203 can be obtained through the pressure sensor. For example, after it is determined that the solid-state battery 203 is in the dormant state, the pressure value is triggered to be obtained at a fixed time interval, so as to obtain at least one pressure value. In the case that the at least one pressure value is greater than the preset pressure value, it is determined that the solid-state battery 203 bears the preset pressure value corresponding to the working state, and it is further determined that the solid-state battery 203 currently bears a large pressure.

[0092] In addition, the fluctuation value of the at least one pressure value can be calculated by selecting the maximum value and the minimum value in the at least one pressure value to calculate the fluctuation value of the at least one pressure value as a whole. In the case that the fluctuation value is less than the preset fluctuation threshold (for example, 0.05 MPa) for a preset second time length (for example, 1 hour), the pressure reduction instruction is generated.

[0093] It can be understood that the solid-state battery 203 is under the preset pressure value of the physical pressure applied by the pressure system 502 when the solid-state battery 203 is in the working state. The physical pressure applied by the pressure system 502 is usually constant. However, due to the electrochemical reaction inside the solid-state battery 203, the solid-state battery 203 itself will change in volume, resulting in a change in the pressure value. Therefore, based on the fluctuation value, it can be determined that the dormant state of the solid-state battery 203 is a stable dormant state, and the solid-state battery 203 itself does not change in volume significantly, and then the pressure reduction is started.

[0094] In the embodiments of the present disclosure, at least one pressure value corresponding to the solid-state battery 203 is obtained; in the case that the at least one pressure value is greater than the preset pressure value, it is determined that the solid-state battery 203 bears the preset pressure value corresponding to the working state; in the case that the fluctuation value of the at least one pressure value is less than the preset fluctuation threshold for a preset second time length, it is determined that the current dormant state of the solid-state battery 203 is stable, and the pressure reduction instruction is generated to start the pressure reduction, thereby improving the safety of the pressure reduction of the solid-state battery 203.

[0095] Optionally, the method further comprises:

[0096] obtaining a temperature rising rate of the solid-state battery 203;

[0097] generating a depressurization instruction in a case where the temperature rising rate reaches a preset rate threshold.

[0098] In the embodiments of the present disclosure, a temperature sensor can be arranged beside the solid-state battery 203 to detect a temperature value of the solid-state battery 203. At least one temperature value corresponding to at least one time point respectively can be collected, and one temperature value corresponds to one time point. According to the at least one time point and the at least one temperature value, the temperature rising rate of the solid-state battery 203 can be calculated, for example, the temperature rising rate ΔT can be calculated by taking the first derivative of the collected temperature value of the solid-state battery 203 with respect to time.

[0099] When the temperature rising rate reaches a preset rate threshold (for example, 0.6 degrees Celsius per minute), a depressurization instruction needs to be generated to take a depressurization process on the solid-state battery 203, for example, to reduce to 0 megapascal, so as to reduce the heat diffusion speed and reduce the heat release caused by the positive and negative electrode short circuit, so as to reduce the loss caused by thermal runaway.

[0100] The embodiments of the present disclosure obtain the temperature rising rate of the solid-state battery 203; and generate a depressurization instruction in a case where the temperature rising rate reaches a preset rate threshold. The depressurization can be taken on the solid-state battery 203 when the temperature of the solid-state battery 203 rises too fast, thereby improving the safety of the solid-state battery 203.

[0101] Optionally, after the step 102 of generating the depressurization instruction to reduce the pressure value corresponding to the solid-state battery 203 in the hibernation state, the method further comprises:

[0102] Step 103: generating a pressurization instruction to increase the pressure value corresponding to the solid-state battery 203 in the working state in a case where it is determined that the solid-state battery 203 enters the working state from the hibernation state.

[0103] In the embodiments of the present disclosure, after the solid-state battery 203 enters the hibernation state from the working state, the solid-state battery 203 can re-enter the working state from the hibernation state when the vehicle starts to run. Similarly, it can be determined that the solid-state battery 203 enters the working state from the hibernation state according to the electrical parameters, for example, according to the electrical parameters such as current or voltage, which will not be described herein.

[0104] In addition, whether the vehicle is started can also be determined by detecting whether the start key of the vehicle is in a starting state, whether the charging port of the vehicle is in a connected state, and the like. The pressure controller 501 can be connected to the vehicle control system, and the pressure controller 501 and the vehicle control system can perform vehicle information transmission, such as transmission of information about vehicle starting, engine off state, vehicle charging interface connection state, and the like. The pressure controller 501 can determine whether the vehicle enters the working state according to the information.

[0105] In a case where it is determined that the solid-state battery 203 enters the working state from the dormant state, a boost instruction is generated, and the boost instruction controls the pressure system 502 to apply greater physical pressure, so that the physical pressure borne by the solid-state battery 203 becomes greater, the active particles in the solid-state battery 203 become more compact, and the solid-state battery 203 has higher discharging efficiency, so as to meet the needs of vehicle driving.

[0106] In the embodiments of the present disclosure, in a case where it is determined that the solid-state battery 203 enters the working state from the dormant state according to the electrical parameter, a boost instruction is generated; and the boost instruction is sent to the pressure system 502 to increase the pressure value corresponding to the solid-state battery 203. The physical pressure can be adjusted in real time according to the running condition of the vehicle, so as to restore the discharging efficiency of the solid-state battery 203, and the flexibility and practicability of the pressure control of the solid-state battery 203 are improved.

[0107] Optionally, the step of generating the boost instruction in a case where it is determined that the solid-state battery 203 enters the working state from the dormant state comprises:

[0108] In a case where it is determined that the solid-state battery 203 enters the working state from the dormant state, a second target pressure value is determined based on the preset pressure value and a preset expansion parameter; the second target pressure value is greater than the preset pressure value.

[0109] A boost instruction carrying the preset pressure value, the second target pressure value, and a preset third time length is generated, so as to apply physical pressure corresponding to the second target pressure value to the solid-state battery 203, and after the preset third time length ends, physical pressure corresponding to the preset pressure value is applied to the solid-state battery 203.

[0110] In the embodiments of the present disclosure, in a case where it is determined that the solid-state battery 203 enters the working state from the dormant state, a second target pressure value is determined based on a preset pressure value and a preset expansion parameter. The second target pressure value can be calculated by the following formula: P2 = n x P0

[0111] wherein P2 is the second target pressure value, P0 is the preset pressure value, and 1 ≤ n ≤ 2. Therefore, the second target pressure value is greater than the preset pressure value.

[0112] The pressure increasing instruction carries the preset pressure value, the second target pressure value, and a preset third time length. The preset third time length can be any time length in 1-10 seconds, or other time length, which is not specifically limited here.

[0113] The pressure system 502 can apply the physical pressure corresponding to the second target pressure value to the solid-state battery 203 within the preset third time length, and apply the physical pressure corresponding to the preset pressure value to the solid-state battery 203 after the preset third time length ends.

[0114] It can be understood that the solid-state battery 203 is usually unable to instantly realize the pressure increase from P1 to P2 from the dormant state, and therefore the pressure increasing instruction can further carry a preset fourth time length. The physical pressure is increased from P1 to P2 through a pressure increasing process in the preset fourth time length. In addition, the pressure system 502 applies the physical pressure corresponding to the preset pressure value to the solid-state battery 203 after the preset third time length ends, and there is also a process of reducing P2 to P0. Therefore, there can be a preset fifth time length. The physical pressure is reduced from P2 to P0 through a pressure reducing process in the preset fifth time length.

[0115] FIG. 4 is a schematic diagram of the pressure increasing and reducing variation provided by the embodiment of the present disclosure. When entering the dormant state, the physical pressure applied by the pressure system 502 is P1. After t1 (the preset fourth time length), the physical pressure is increased from P1 to P2. P2 is greater than P0. P2 is maintained within the preset third time length (t2-t1), and then reduced from P2 to P0 within the preset fifth time length (t3-t2).

[0116] It should be noted that the values of t1, t2, and t3 are mainly affected by the response ability of the pressure control system and the user experience. The smaller t1, t2, and t3 are, the higher the response sensitivity of the pressure control system needs to be and the better the pressure fast and accurate control ability needs to be. At the same time, the smaller t1, t2, and t3 are, the better the user experience is. In addition, the secondary influencing factor of the value of t2 is the difference between the pressure P2 and P1. The greater the difference is, the greater t2 can be.

[0117] In the case of determining that the solid-state battery 203 enters the working state from the dormant state, a larger second target pressure value is calculated based on the preset pressure value and the preset expansion parameter in the implementation of the present disclosure. A pressure increasing instruction carrying the preset pressure value, the second target pressure value and the preset third time length is generated; the pressure system 502 can apply a physical pressure corresponding to the second target pressure value to the solid-state battery 203 within the preset third time length, so that the tightness of the active particles in the solid-state battery 203 can be quickly improved, the state of the solid-state battery 203 is quickly restored, the discharge efficiency of the solid-state battery 203 is improved, and the vehicle can quickly obtain sufficient power supply when starting, thereby improving the vehicle driving efficiency. After the preset third time length ends, a physical pressure corresponding to the preset pressure value is applied to the solid-state battery 203 to provide more stable power supply to the vehicle, thereby improving the safety of the solid-state battery 203.

[0118] FIG. 5 is a schematic diagram of a pressure control architecture provided by an embodiment of the present disclosure; FIG. 5 includes a pressure controller 501, a pressure system 502, a vehicle control system 503 and a solid-state battery 203 package 200, and the solid-state battery 203 package 200 includes a clamping plate 201, a bottom plate 202, a temperature sensor and a pressure sensor 506, a positive electrode tab 204 of the solid-state battery 203, and a negative electrode tab 205 of the solid-state battery 203. The pressure system 502 can be a suspension system of the vehicle.

[0119] The following is a possible pressure control process for solid-state batteries 203 made of different materials:

[0120] Example 1: When the positive electrode of the solid-state battery 203 uses ternary material LiNi0.9Co0.05Mn0.05O2, the solid-state electrolyte layer uses Li6PS5Cl, and the negative electrode uses a pure silicon negative electrode. The positive and negative electrodes and the electrolyte layer are prepared into a single solid-state battery 203 in a stacking manner, and the larger surface of the single solid-state battery 203 is assembled into a solid-state battery 203 package 200 in parallel with the clamping plate 201. The following pressure control process can be used:

[0121] The solid-state battery 203 pack 200 works at a constant spacing between the solid-state battery 203 and the bottom plate 202 and the clamping plate 201 under the initial pressure P0 (20 MPa). When discharged to 90% SOC, the electronic control unit (pressure controller 501) detects that the solid-state battery 203 current is equal to 0 A, and the time during which it is equal to 0 A reaches 3 hours, at which time it is determined to be in a dormant state. At this time, the solid-state battery 203 pressure is 27 MPa (higher than 20 MPa because the volume inside the solid-state battery 203 changes and the spacing is constant), and the time during which the solid-state battery 203 pressure fluctuation value ΔP≤0.05 MPa reaches 0.5 h, at which time it is determined that the solid-state battery 203 enters a stable dormant state, and then the electronic control unit sends a command to adjust the pressure applied to the solid-state battery 203 to P1=3.6 MPa through the pressure control unit (pressure system 502). After the solid-state battery 203 has been kept at a pressure of 3.6 MPa for a period of time, the electronic control unit detects that the vehicle start key is in the active state, at which time the electronic control unit adjusts the pressure applied to the solid-state battery 203 from 3.6 MPa to 54 MPa through the pressure control unit within 10 s, and the pressure is kept at 54 MPa for 60 s, and then the pressure is reduced to 27 MPa within 10 s. Then the solid-state battery 203 continues to work at this pressure.

[0122] Example 2: The solid-state battery 203 of Example 2 is prepared differently from Example 1 in that lithium metal is used for the negative electrode. The positive and negative electrodes and the electrolyte layer are prepared in a stacked manner to form the solid-state battery 203. Example 2 can have the following pressure control process:

[0123] The solid-state battery 203 works in a constant pressure mode (the spacing between the solid-state battery 203 clamping plates 201 is adjusted in real time according to the constant pressure requirement) under an initial pressure of 2 MPa. When discharged to 20% SOC, the electronic control unit detects that the solid-state battery 203 current is equal to 1 mA, and the time during which it is equal to 1 mA reaches 4 hours, and the time during which the solid-state battery 203 pressure fluctuation value ΔP≤0.05 MPa reaches 1 h, at which time it is determined that the solid-state battery 203 enters a stable dormant state, and then the electronic control unit sends a command to adjust the pressure applied to the battery through the pressure control unit to 0 MPa. After the battery has been kept at a pressure of 0 MPa for a period of time, the electronic control unit detects that the charging port is connected, indicating that the solid-state battery 203 will enter a charging state, at which time the electronic control unit adjusts the pressure applied to the solid-state battery 203 to 2 MPa through the pressure control unit within 5 s, and after the solid-state battery 203 is stable at a pressure of 2 MPa for 10 s, the solid-state battery 203 resumes the pressure program and can enter a normal working state to work at the corresponding preset pressure value.

[0124] Example 3: The solid-state battery 203 of Example 3 is prepared differently from Example 1 in that a silicon-carbon anode is used for the anode. The positive electrode, negative electrode, and electrolyte layer are prepared in a stacked manner to form the solid-state battery 203. Example 3 can have the following pressure control process:

[0125] The solid-state battery 203 is cycled in a constant interval mode at an initial pressure of 5 MPa. When discharged to 10% SOC, the electronic control unit detects that the current of the solid-state battery 203 is equal to 0.01 mA, the 0.01 mA holding time reaches 3 hours, and the time during which the pressure fluctuation value ΔP of the solid-state battery 203 is less than or equal to 0.05 MPa reaches 1 hour. At this time, the pressure of the solid-state battery 203 is 5.5 MPa. Subsequently, the electronic control unit sends a command to adjust the pressure applied to the solid-state battery 203 to 0.05 MPa by the pressure control unit. After the solid-state battery 203 is maintained at a pressure of 0.05 MPa for a period of time, the electronic control unit detects that the vehicle start key is in an activated state. At this time, the electronic control unit adjusts the pressure applied to the solid-state battery 203 to 10 MPa within 5 seconds by the pressure control unit. After maintaining this pressure for 30 seconds, the pressure is adjusted back to 5.5 MPa within 2 seconds. The solid-state battery 203 then continues to operate in a constant interval mode at this pressure.

[0126] Example 4: The solid-state battery 203 in this example is prepared differently from Example 1 in that a graphite anode is used for the anode.

[0127] The positive electrode, negative electrode, and electrolyte layer are prepared in a stacked manner to form the solid-state battery 203. The solid-state battery 203 is cycled in a constant interval mode at an initial pressure of 9 MPa. When discharged to 95% SOC, the electronic control unit detects that the operating current of the solid-state battery 203 is equal to 0.01 mA, the 0.01 mA holding time reaches 3 hours, and the time during which the pressure fluctuation value ΔP of the solid-state battery 203 is less than or equal to 0.05 MPa reaches 1 hour. At this time, the pressure of the solid-state battery 203 is 9.5 MPa. Subsequently, the electronic control unit sends a command to adjust the pressure applied to the solid-state battery 203 to 0.4 MPa by the pressure control unit. After the solid-state battery 203 is maintained at a pressure of 0.4 MPa for a period of time, the electronic control unit detects that the vehicle start key is in an activated state. At this time, the electronic control unit adjusts the pressure applied to the solid-state battery 203 to 10 MPa within 5 seconds by the pressure control unit. After maintaining this pressure for 5 seconds, the pressure is adjusted back to 9.5 MPa within 2 seconds. The solid-state battery 203 then continues to operate in a constant interval mode at this pressure.

[0128] The solid-state battery 203 to which the above solid-state battery pressure control method is applied and the solid-state battery 203 to which the solid-state battery pressure control method is not applied can be compared. The solid-state battery 203 used can be the solid-state battery 203 prepared in the above Example 1, Example 2, and Example 3. When these solid-state batteries 203 are 100% SOC, they enter a dormant state (i.e., undergo pressure reduction), and a storage experiment is performed. The experimental conditions are that the solid-state batteries 203 in the dormant state are stored at 45°C for 28 days, and the ratio of the remaining capacity of the solid-state battery 203 after storage to the initial capacity is calculated, which is the capacity remaining rate of the solid-state battery 203. In addition, the ratio of the maximum discharge capacity after 3 charge-discharge cycles to the initial capacity is calculated, which is the capacity recovery rate. The self-discharge of the solid-state batteries 203 prepared in Example 1, Example 2, and Example 3 is determined according to the capacity remaining rate and the capacity recovery rate.

[0129] The solid-state batteries 203 prepared in the same Example 1 are stored at 45°C for 28 days after 100% SOC, maintaining the physical pressure at the end of charging (i.e., without pressure reduction), and the capacity remaining rate and the capacity recovery rate after storage are tested to determine the self-discharge of the solid-state batteries 203. The capacity remaining rate and the capacity recovery rate of the solid-state batteries 203 prepared in Example 1, Example 2, and Example 3, which apply the solid-state battery pressure control method, and the solid-state batteries 203 of another Example 1, which do not apply, are compared as shown in Table 1 below.

[0130] Table 1

[0131] As shown in Table 1, the solid-state batteries 203 prepared in Example 1, Example 2, and Example 3 all apply the solid-state battery pressure control method. Due to the different preparation methods of the solid-state batteries 203, the capacity remaining rate and the capacity recovery rate are slightly different, but overall they maintain good capacity remaining rate and capacity recovery rate. The capacity remaining rate and the capacity recovery rate of the solid-state batteries 203 of another Example 1 used for comparison are significantly lower.

[0132] In addition, the solid-state batteries 203 can also be cycled 200 times according to the full charge and full discharge process, and then stored for 2 days when each solid-state battery 203 is 100% SOC. Finally, the capacity that each solid-state battery 203 can maintain is observed. The storage time and temperature are the same, and the only difference is whether the solid-state battery pressure control method is applied for pressure reduction during storage. The capacity retention rate is shown in Table 2 below.

[0133] Table 2

[0134] As shown in Table 2, the solid-state batteries 203 prepared in Example 1, Example 2, and Example 3 still have a high capacity retention rate, while the capacity retention rate of the solid-state batteries 203 of Example 1 used for comparison is significantly lower.

[0135] To sum up, in the embodiment of the application, by acquiring the running state of the solid-state battery 203, in the case that the solid-state battery 203 enters the dormant state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, a pressure reduction instruction is generated, so as to reduce the pressure corresponding to the dormant state of the solid-state battery 203. The solid-state battery 203 loss caused by continuous pressure on the basis of the large self-discharge characteristic of the solid-state battery 203 is avoided, the service life of the solid-state battery 203 is improved, and the solid-state battery 203 loss is reduced.

[0136] The embodiment of the application further provides an electronic device 600, as shown in FIG. 6, which comprises a processor 601, a communication interface 602, a memory 603 and a communication bus 604, wherein the processor 601, the communication interface 602 and the memory 603 complete mutual communication through the communication bus 604.

[0137] The memory 603 is used for storing a computer program.

[0138] The processor 601 is used for executing the program stored in the memory 603, and the following steps are realized: acquiring the running state of the solid-state battery 203; the running state comprises a working state and a dormant state; in the case that the solid-state battery 203 enters the dormant state from the working state and the solid-state battery 203 bears the preset pressure value corresponding to the working state, a pressure reduction instruction is generated, so as to reduce the pressure value corresponding to the dormant state of the solid-state battery 203.

[0139] The processor 601 can also realize other steps in the solid-state battery pressure control method, which will not be described here.

[0140] The communication bus 604 mentioned in the above electronic device 600 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The communication bus 604 can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0141] The communication interface 602 is used for communication between the above electronic device 600 and other devices.

[0142] The memory 603 can include a random access memory (RAM) and can also include a non-volatile memory, such as at least one disk storage. Optionally, the memory 603 can also be at least one storage device remotely located from the aforementioned processor 601.

[0143] The processor 601 described above can be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0144] In yet another embodiment provided in the present application, a computer readable storage medium is also provided, and the computer readable storage medium stores instructions, when the instructions run on a computer, cause the computer to execute the solid-state battery pressure control method described in the above embodiments.

[0145] In yet another embodiment provided in the present application, a computer program product containing instructions is also provided, and when the instructions run on a computer, cause the computer to execute the solid-state battery pressure control method described in the above embodiments.

[0146] In the embodiments described above, all or some of the steps can be implemented by software, hardware or firmware, or any combination thereof. When implemented by software, all or some of the steps can be implemented in the form of one or more computer programs. The computer program can be stored in any computer readable medium, and when loaded into a computer system, causes the computer system to perform one or more of the steps of the computer program. The computer readable medium can be a magnetic disk, an optical disk or a solid state drive, or any combination thereof. The computer readable medium can be distributed to computer systems connected by a network, so that the computer programs that constitute the computer programs (which can also be in the form of computer readable medium) can be stored in and executed by the network connected computer systems in a distributed manner.

[0147] It should be noted that, in the present document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Also, the terms "comprising", "containing" or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0148] Each of the embodiments in the present specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. For the embodiments of the apparatus, electronic device, computer readable storage medium and computer program product containing instructions thereof, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0149] The above merely provides the preferred embodiment of the present application, and not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling the pressure of a solid-state battery, characterized in that, The method includes: The operating status of the solid-state battery is obtained; the operating status includes an active state and a dormant state. When it is determined that the solid-state battery has entered the dormant state from the operating state and the solid-state battery has been subjected to a preset pressure value corresponding to the operating state, a pressure reduction command is generated to reduce the pressure value of the solid-state battery in the dormant state.

2. The method according to claim 1, characterized in that, The step of obtaining the operating status of the solid-state battery includes: Obtain the electrical parameters of the solid-state battery; the electrical parameters are used to represent the operating state of the solid-state battery; The operating state of the solid-state battery is determined based on the electrical parameters.

3. The method according to claim 1 or 2, characterized in that, The step of generating a voltage reduction command when it is determined that the solid-state battery has entered the dormant state from the operating state and the solid-state battery has withstood a preset pressure value corresponding to the operating state includes: When it is determined that the solid-state battery has entered the dormant state from the operating state and the solid-state battery has withstood a preset pressure value corresponding to the operating state, the performance parameters of the solid-state battery are obtained; the performance parameters represent the power supply capacity of the solid-state battery. Based on the performance parameters, the first target pressure value corresponding to the hibernation state is calculated; Generate a pressure reduction command carrying the first target pressure value; the preset pressure value is the physical pressure borne by the solid-state battery before pressure reduction, and the first target pressure value is the physical pressure borne by the solid-state battery after pressure reduction.

4. The method according to claim 2, characterized in that, The electrical parameters include current parameters; The step of generating a voltage reduction command when it is determined that the solid-state battery has entered the dormant state from the operating state and the solid-state battery has withstood a preset pressure value corresponding to the operating state includes: If the current parameter is continuously less than a preset current threshold and the duration reaches a preset first duration, the solid-state battery is determined to enter the dormant state from the working state. When the solid-state battery is in the dormant state and the solid-state battery has been subjected to a preset pressure value corresponding to the working state, a pressure reduction command is generated.

5. The method according to claim 4, characterized in that, The step of generating a voltage reduction command when the solid-state battery is in the dormant state and the solid-state battery has been subjected to a preset pressure value corresponding to the operating state includes: When the solid-state battery is in the dormant state and at least one pressure value of the solid-state battery is greater than the preset pressure value, it is determined that the solid-state battery has withstood the preset pressure value corresponding to the working state. When the fluctuation value of at least one pressure value is continuously less than a preset fluctuation threshold and the duration reaches a preset second duration, a pressure reduction command is generated.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: Obtain the heating rate of the solid-state battery; When the heating rate reaches a preset rate threshold, a pressure reduction command is generated.

7. The method according to any one of claims 1-6, characterized in that, After the step of generating a buck command to reduce the pressure value of the solid-state battery in the dormant state, the method further includes: When it is determined that the solid-state battery has entered the working state from the dormant state, a boost command is generated to increase the pressure value of the solid-state battery in the working state.

8. The method according to claim 7, characterized in that, The step of generating a boost command when it is determined that the solid-state battery has entered the operating state from the dormant state includes: When it is determined that the solid-state battery has entered the working state from the dormant state, a second target pressure value is determined based on the preset pressure value and the preset amplification parameter; the second target pressure value is greater than the preset pressure value. A boost command is generated, carrying the preset pressure value, the second target pressure value, and a preset third duration, to apply a physical pressure corresponding to the second target pressure value to the solid-state battery, and after the preset third duration ends, a physical pressure corresponding to the preset pressure value is applied to the solid-state battery.

9. An electronic device, characterized in that, include: Processor and memory; The memory is used to store computer programs; When the processor executes the program stored in the memory, it implements the steps in the solid-state battery pressure control method as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the solid-state battery pressure control method as described in any one of claims 1 to 8.

11. A vehicle, characterized in that, Includes the electronic device described in claim 9 above.

12. A solid-state battery device, characterized in that, Includes the electronic device described in claim 9 above.

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