Pressure regulation system for solid-state battery, energy storage device, and vehicle

Abstract

The present application discloses a pressure regulation system (100) for a solid-state battery, an energy storage device, and a vehicle. The pressure regulation system (100) comprises: a box (11), an inner cavity of the box (11) being provided with a pressure regulation member (12), and the pressure regulation member (12) dividing the inner cavity of the box (11) into an accommodating cavity (13) for accommodating a solid-state battery (15) and a pressurizing cavity (14) for accommodating a pressure medium; and a suspension (2), the suspension (2) comprising a pressure regulation circuit (20), the pressure regulation circuit (20) being communicated with the pressurizing cavity (14), and the pressure regulation circuit (20) regulating the pressure applied by the pressure regulation member (12) to the solid-state battery (15) by regulating the pressure medium in the pressurizing cavity (14).

Description

Pressure regulation system of solid-state battery, energy storage device and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202411068403.X, filed on August 5, 2024, entitled "Pressure regulation system of solid-state battery, energy storage device and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a pressure regulation system of solid-state battery, an energy storage device and a vehicle. BACKGROUND

[0003] All-solid-state batteries are mainly composed of inorganic solid materials, and need to maintain a continuous pressure during operation to ensure the contact and conduction of active particles.

[0004] At present, there are two ways to apply pressure to all-solid-state batteries. One is constant spacing pressure, that is, the spacing of the solid-state battery clamp is fixed during charging and discharging. In this case, when charging, the solid-state battery expands, and because the spacing of the clamp is fixed, the pressure borne by the solid-state battery gradually increases. When discharging, as the volume of the solid-state battery shrinks, the pressure borne by the solid-state battery gradually decreases. The other way to apply pressure is adjustable spacing pressure, the spacing of the clamp is adjusted according to the expansion of the solid-state battery during charging and discharging. When the volume of the solid-state battery expands, the spacing of the clamp increases, which can reduce the pressure borne by the solid-state battery.

[0005] However, the above two methods have the problem of complex structure and high cost when applied to vehicles, because a driving mechanism needs to be configured for the clamp. SUMMARY

[0006] In view of the above problems, the present application provides a pressure regulation system of solid-state battery, an energy storage device and a vehicle, which uses the pressure regulation circuit of the suspension to regulate the pressure of the solid-state battery, thereby reducing the redundant components of the vehicle design and reducing the cost.

[0007] The present application provides a pressure regulation system of solid-state battery, comprising: a box body, a pressure regulation member is arranged in the inner cavity of the box body, the pressure regulation member divides the inner cavity of the box body into a containing cavity for containing the solid-state battery and a pressurizing cavity for containing a pressure medium; a suspension, the suspension comprises a pressure regulation circuit, the pressure regulation circuit communicates with the pressurizing cavity; the pressure regulation circuit adjusts the pressure of the pressure medium in the pressurizing cavity to adjust the pressure applied to the solid-state battery by the pressure regulation member.

[0008] The pressure regulating system of the solid-state battery of the present application communicates the pressure regulating circuit of the vehicle suspension and the pressurized cavity of the tank, realizes the purpose of regulating the pressure borne by the solid-state battery by using the pressure regulating circuit of the suspension, on the one hand, can realize self-adaptive regulation of the solid-state battery pressure according to the state of the solid-state battery, to ensure good interface contact and electrical conduction of the active particles inside the solid-state battery during the cycle process, to realize a higher degree of performance, so that the solid-state battery charging and discharging process is more stable and reliable, and the electrical performance is greatly improved; on the other hand, since the suspension of the vehicle and the solid-state battery share the pressure regulating circuit, the integration of the vehicle can be improved, the pressure supply device configured for the solid-state battery can be saved, the redundant components of the vehicle design can be reduced, the design can be simplified, the cost can be reduced, and the chassis assembly volume can be reduced, greatly improving the chassis volume utilization.

[0009] In some embodiments, the pressure regulating circuit comprises a medium container for storing the pressure medium, a medium driving device configured to drive the pressure medium to inject from the medium container into the pressurized cavity or to flow back from the pressurized cavity to the medium container, a plurality of shock absorbers, and an electronic control unit.

[0010] In some embodiments, the medium driving device is further configured to drive the pressure medium to inject from the medium container into the shock absorber or to flow back from the shock absorber to the medium container; and / or the electronic control unit is further configured to control the operating state of the medium driving device according to the pressure regulating requirement of the shock absorber.

[0011] In some embodiments, the containing cavity and the pressurized cavity are arranged along a first direction; the solid-state battery is a plurality of solid-state batteries, and the projections of the plurality of solid-state batteries in a reference plane are within the projection of the pressure regulating member in the reference plane, and the reference plane is perpendicular to the first direction.

[0012] In some embodiments, a plurality of the solid-state batteries are arranged side by side along the first direction, and the first direction is parallel to the thickness direction of the solid-state battery.

[0013] In some embodiments, the pressure regulating system further comprises a detection unit for detecting the working condition parameters of the solid-state battery; and the electronic control unit controls the operating state of the medium driving device according to the working condition parameters to regulate the pressure medium in the pressurized cavity.

[0014] In some embodiments, the working condition parameter includes pressure and temperature of the solid-state battery, the detection unit includes: a pressure detection device arranged on the box to detect the pressure of the solid-state battery; a temperature detection device arranged on the box to detect the temperature of the solid-state battery; and the electronic control unit is in communication connection with the pressure detection device and the temperature detection device respectively, so as to control the operating state of the medium driving device according to the detection results of the pressure detection device and the temperature detection device.

[0015] In some embodiments, the pressure detection device and the temperature detection device are an integrated detection structure.

[0016] In some embodiments, the integrated detection structure is arranged between the solid-state battery and the pressure adjusting member; or the integrated detection structure is embedded in the pressure adjusting member.

[0017] In some embodiments, the pressure adjusting circuit further includes a main pipeline, a first branch pipeline and a second branch pipeline, the medium driving device and the medium container are communicated through the main pipeline, the battery pack is communicated with the main pipeline through the first branch pipeline and the main pipeline, the second branch pipeline is one-to-one corresponding to the plurality of dampers, each of the dampers is communicated with the main pipeline through the corresponding second branch pipeline, and the first branch pipeline and the plurality of second branch pipelines are respectively provided with on-off control valves to control the flow state of the pressure medium.

[0018] In some embodiments, the pressure adjusting system further includes: a first pressure relief valve in communication with the first branch pipeline; and a second pressure relief valve in communication with the second branch pipeline.

[0019] In some embodiments, the medium container is a liquid storage tank, the pressure medium is hydraulic oil, the medium driving device is a hydraulic pump, the hydraulic pump is arranged on the downstream side of the medium container and the upstream side of the first branch pipeline and the second branch pipeline.

[0020] In some embodiments, the pressure adjusting system further includes: a one-way valve arranged on the main pipeline and located on the downstream side of the hydraulic pump in the liquid outlet direction of the medium container.

[0021] In some embodiments, the pressure adjusting circuit further includes: an oil return branch pipeline, an inlet of the oil return branch pipeline is in communication with the main pipeline, the inlet is arranged on the downstream side of the one-way valve and the upstream side of the first branch pipeline and the second branch pipeline, and an outlet of the oil return branch pipeline is in communication with the medium container; and an oil return valve arranged on the oil return branch pipeline to control the on-off of the oil return branch pipeline.

[0022] In some embodiments, the medium container is a gas tank, the pressure medium is compressed air, and the medium driving device is an air compressor.

[0023] In some embodiments, the air compressor is arranged on the upstream side of the medium container.

[0024] In a second aspect, the present application further provides an energy storage device, comprising: a solid-state battery and the pressure regulating system of the solid-state battery according to the first aspect, wherein the solid-state battery is arranged in the accommodating cavity of the box body.

[0025] The energy storage device according to the present application uses a solid-state battery as an energy storage device, which can improve the energy density of the energy storage device and store more energy. By arranging the above-mentioned pressure regulating system for the solid-state battery, the charging and discharging process of the solid-state battery is more stable and reliable, which can better output energy and improve the electrical performance of the energy storage device.

[0026] In a third aspect, the present application further provides a vehicle, comprising: a vehicle body; and the energy storage device according to the second aspect, wherein the energy storage device is arranged in the vehicle body.

[0027] The vehicle according to the present application uses a solid-state battery as a power source, which has a higher energy density and can increase the endurance of the vehicle and improve the user experience. By arranging the energy storage device in the above-mentioned embodiments, the charging and discharging process of the solid-state battery is more stable and reliable, which can better output energy. Moreover, the integration of the vehicle can be improved, the pressure supply device for the solid-state battery can be omitted, the redundant components of the vehicle design can be reduced, the design can be simplified, and the cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] FIG. 1 is a schematic diagram of one embodiment of the pressure regulating system according to the present application, wherein the suspension is a hydraulic suspension;

[0030] FIG. 2 is a schematic diagram of another embodiment of the pressure regulating system according to the present application, wherein the suspension is a hydraulic suspension;

[0031] FIG. 3 is a schematic diagram of another embodiment of the pressure regulating system according to the present application, wherein the suspension is a hydraulic suspension;

[0032] FIG. 4 is a schematic diagram of another embodiment of the pressure regulating system according to the present application, wherein the suspension is an air suspension;

[0033] Fig. 5 is a structural schematic diagram of a medium container according to some embodiments of the present application;

[0034] Fig. 6 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0035] Fig. 7 is a schematic diagram of a spring used to provide pressure for a solid-state battery in the related art.

[0036] Legend: 100 - pressure regulating system; 1 - battery pack; 11 - box body; 12 - pressure regulating member; 13 - containing cavity; 14 - pressurizing cavity; 15 - solid-state battery; 16 - positive electrode port; 17 - negative electrode port; 18 - communication port; 2 - suspension; 20 - pressure regulating circuit; 201 - main pipeline; 202 - first branch pipeline; 203 - second branch pipeline; 204 - oil return branch pipeline; 21 - medium container; 211 - first medium storage area; 212 - second medium storage area; 22 - medium driving device; 22a - first medium driving device; 22b - second medium driving device; 23 - electronic control unit; 23a - first electronic control unit; 23b - second electronic control unit; 24 - shock absorber; 25 - detection unit; 26 - on-off control valve; 27 - first pressure relief valve; 28 - second pressure relief valve; 29 - one-way valve; 30 - opening degree adjusting valve; 31 - oil return valve. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more apparent and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0038] The battery interface problem is not prominent under the electrolyte system. During the operation of the battery, the electrolyte can adapt to the volume change of the material expansion and contraction, and there is no disconnection of the physical electrical connection between the material and the electrolyte caused by the volume change. However, the all-solid-state battery is composed of inorganic solid materials, and needs to maintain a continuous pressure during operation to ensure the contact and conduction of active particles.

[0039] There are two ways to apply pressure to the solid-state battery at present. One is constant spacing pressure, that is, the spacing of the clamp is fixed during charging and discharging. In this case, when charging, the solid-state battery expands, and because the spacing of the clamp is fixed, the pressure borne by the solid-state battery gradually increases. When discharging, as the volume of the solid-state battery shrinks, the pressure borne by the solid-state battery gradually decreases. At the same time, as the solid-state battery circulates, the volume of the solid-state battery gradually increases due to different SOH states. Therefore, the pressure borne by the solid-state battery with different SOH states and different cycle numbers is different under the same spacing. This will cause the consistency of the solid-state battery to deteriorate. The other way is adjustable spacing pressure, that is, the spacing of the clamp is adjusted according to the expansion during charging and discharging. When the volume of the solid-state battery expands, the spacing of the clamp is large, which can appropriately reduce the pressure borne by the solid-state battery. However, the above two ways are applied to vehicles, and because a driving mechanism needs to be configured for the clamp, the structure of the vehicle is complex and the cost is high.

[0040] Therefore, the application provides a solid-state battery pressure adjusting system, an energy storage device and a vehicle. The pressure adjusting circuit of the vehicle suspension and the pressurizing cavity of the box are connected, so that the pressure of the solid-state battery is adjusted by the pressure adjusting circuit of the suspension. On the one hand, the pressure of the solid-state battery can be adaptively adjusted according to the state of the solid-state battery, so as to ensure that the active particles in the solid-state battery are in good interface contact and electrical conduction during the cycle of the solid-state battery, and a high degree of performance is achieved. On the other hand, the pressure supply device for the solid-state battery is omitted, which can reduce the redundant components of the vehicle design and reduce the cost.

[0041] The solid-state battery pressure adjusting system 100 of the first aspect embodiment of the application will be described below in combination with FIGS. 1-7.

[0042] In combination with FIGS. 1-6, the pressure adjusting system 100 of the present embodiment can be used to adjust the pressure borne by the solid-state battery 15 of the vehicle. The vehicle can be used for a new energy vehicle or a hybrid vehicle. The vehicle can include a vehicle body, and the pressure adjusting system 100 can include a box 11 and a suspension 2. The vehicle body can provide a mounting position for the box 11 and the suspension 2, and the box 11 and the suspension 2 are arranged on the vehicle body. The solid-state battery 15 can provide a power source for the operation of the vehicle, and the suspension 2 can provide cushioning for the vehicle body to adjust the stability of the vehicle body.

[0043] Referring to FIG. 6, the solid-state battery 15 can be square, and the box 11 can also be square. The inner cavity of the box 11 is provided with a pressure adjusting piece 12, which can be a movable clamp plate.

[0044] The pressure adjusting member 12 can divide the inner cavity of the box 11 into a containing cavity 13 and a pressurizing cavity 14, wherein the containing cavity 13 can be used to contain the solid-state battery 15, and the pressurizing cavity 14 is used to contain a pressure medium, which can be a gas, a liquid, etc. For example, the box 11 can include a bottom plate, a top plate, and a plurality of side plates, the plurality of side plates are arranged around the periphery of the bottom plate, the bottom plate and the top plate are respectively located at two ends of the side plates, the pressure adjusting member 12 is arranged in parallel between the bottom plate and the top plate, the pressure adjusting member 12 and the bottom plate define the containing cavity 13, and the pressure adjusting member 12 and the top plate define the pressurizing cavity 14. The cavity wall of the pressurizing cavity 14 is further provided with a communication port 18 which communicates the pressurizing cavity 14 and an external pipeline. It can be understood that the solid-state battery 15 and the box 11 can jointly constitute a battery pack 1 of a vehicle, so that the battery pack 1 is assembled on the vehicle as an integrated modular structure.

[0045] The suspension 2 can be an air suspension or a hydraulic suspension. The suspension 2 can include a pressure adjusting circuit 20 which communicates with the pressurizing cavity 14, and the pressure adjusting circuit 20 can adjust the volume of the pressure medium in the pressurizing cavity 14, so as to adjust the pressure applied by the pressure adjusting member 12 to the solid-state battery 15. For example, the cavity wall of the pressurizing cavity 14 can be provided with the communication port 18, and the pressure adjusting circuit 20 can inject the pressure medium into the pressurizing cavity 14 through the communication port 18, so as to increase the pressure in the pressurizing cavity 14, thereby increasing the pressure applied by the pressure adjusting member 12 to the solid-state battery 15; or the pressure medium in the pressurizing cavity 14 can also flow into the pressure adjusting circuit 20 through the communication port 18, so as to reduce the pressure in the pressurizing cavity 14, thereby reducing the pressure applied by the pressure adjusting member 12 to the solid-state battery 15.

[0046] Optionally, the pressure adjusting member 12 can be configured to move relative to the box 11 under the action of the pressure medium, in other words, the pressure adjusting member 12 is movable relative to the box 11. When the pressure adjusting member 12 moves relative to the box 11, the volumes of the pressurizing cavity 14 and the containing cavity 13 change simultaneously. For example, when the pressure adjusting member 12 moves towards the side of the pressurizing cavity 14, the pressurizing cavity 14 shrinks and the containing cavity 13 becomes larger; when the pressure adjusting member 12 moves towards the side of the containing cavity 13, the containing cavity 13 shrinks and the pressurizing cavity 14 becomes larger. Since the pressure medium is uniformly distributed in the pressurizing cavity 14, the pressure medium can drive the pressure adjusting member 12 to move as a whole, so that the pressure adjusting member 12 can uniformly increase or decrease the pressure of each region of the solid-state battery 15, thereby avoiding the uneven internal pressure of the solid-state battery 15, and being beneficial to improving the charging and discharging performance of the solid-state battery 15.

[0047] That is, the pressure regulating system 100 of the solid-state battery in the embodiment communicates the pressure regulating circuit 20 of the vehicle suspension 2 and the pressurized cavity 14 of the box 11, and achieves the purpose of regulating the pressure borne by the solid-state battery 15 by using the pressure regulating circuit 20 of the suspension 2. On the one hand, the pressure of the solid-state battery 15 can be adaptively regulated according to the state of the solid-state battery 15, so as to ensure good interface contact and electrical conduction of the active particles in the solid-state battery 15 during the circulation process, achieve a high degree of performance, and thus make the charging and discharging process of the solid-state battery 15 more stable and reliable, and greatly improve the electrical performance. On the other hand, since the suspension 2 of the vehicle and the solid-state battery 15 share the pressure regulating circuit 20, the integration of the vehicle can be improved, and the pressure supply device for the solid-state battery 15 can be omitted, which can reduce redundant components of the vehicle design, simplify the design, reduce the cost, and greatly improve the utilization rate of the chassis volume.

[0048] In some embodiments, in combination with FIGS. 1-4, the pressure regulating circuit 20 can include a medium container 21, a medium driving device 22, a plurality of shock absorbers 24, and an electronic control unit 23. The medium container 21 is used to store pressure medium, and the medium container 21 is in communication with the pressurized cavity 14 and the shock absorber 24, respectively. In this way, the suspension 2 and the solid-state battery 15 share the medium container 21, which can provide pressure medium for the shock absorber 24 of the suspension 2 to ensure the normal damping function of the shock absorber 24, and also provide pressure medium for the pressurized cavity 14 to regulate the pressure of the battery pack 1.

[0049] The electronic control unit 23 can control the medium driving device 22 to inject pressure medium from the medium container 21 into the pressurized cavity 14 or to flow back from the pressurized cavity 14 to the medium container 21 according to the pressure regulating requirements of the solid-state battery 15. For example, when the solid-state battery 15 is charging, the volume of the solid-state battery 15 expands, and at this time the electronic control unit 23 can control the medium driving device 22 to drive the pressure medium to flow back from the pressurized cavity 14 to the medium container 21. When the solid-state battery 15 is discharging, the volume of the solid-state battery 15 shrinks, and in order to maintain sufficient pressure, the electronic control unit 23 can control the medium driving device 22 to inject pressure medium from the medium container 21 into the pressurized cavity 14.

[0050] In this way, the medium container 21 of the vehicle suspension 2 can be used to inject pressure medium into the pressurized cavity 14 or to accommodate the pressure medium in the pressurized cavity 14, so as to regulate the pressure of the solid-state battery 15, and the solid-state battery 15 and the vehicle suspension 2 can share the medium container 21, which is beneficial to reduce the overall redundant components, simplify the design, and reduce the cost.

[0051] Optionally, the medium driving device 22 can be used only to drive the pressure medium to flow between the medium container 21 and the battery pack 1, at this time, a separate medium driving device 22 can be configured for the shock absorber 24 of the suspension 2, as shown in FIG. 2, that is, the pressure regulating circuit 20 is provided with two medium driving devices 22, which are a first medium driving device 22a and a second medium driving device 22b, wherein the first medium driving device 22a drives the pressure medium to flow between the medium container 21 and the battery pack 1, and the second medium driving device 22b drives the pressure medium to flow between the medium container 21 and the shock absorber 24.

[0052] Alternatively, as shown in FIGS. 1 and 3, the medium driving device 22 is provided with only one, that is, the medium driving device 22 can drive the pressure medium to flow between the medium container 21 and the pressurizing cavity 14, and also can drive the pressure medium to flow between the medium container 21 and the shock absorber 24, so that the suspension 2 and the solid-state battery 15 share the medium driving device 22.

[0053] Optionally, the electronic control unit 23 can be used only to control the medium driving device 22 to drive the pressure medium to flow between the medium container 21 and the pressurizing cavity 14 according to the pressure regulating requirement of the solid-state battery 15, at this time, a separate electronic control unit 23 can be configured for the shock absorber 24 of the suspension 2, as shown in FIGS. 2 and 3, that is, the pressure regulating circuit 20 is provided with two electronic control units 23, which are a first electronic control unit 23a and a second electronic control unit 23b, wherein the first electronic control unit 23a controls the pressure medium to flow between the medium container 21 and the battery pack 1 according to the pressure regulating requirement of the solid-state battery 15, and the second electronic control unit 23b controls the pressure medium to flow between the medium container 21 and the shock absorber 24 according to the pressure regulating requirement of the shock absorber 24.

[0054] Alternatively, as shown in FIG. 1, the electronic control unit 23 is provided with only one, that is, the electronic control unit 23 can control the pressure medium to flow between the medium container 21 and the pressurizing cavity 14 according to the pressure regulating requirement of the solid-state battery 15, and also can control the pressure medium to flow between the medium container 21 and the shock absorber 24 according to the pressure regulating requirement of the shock absorber 24, so that the suspension 2 and the solid-state battery 15 can share the electronic control unit 23.

[0055] In a specific example, referring to FIG. 1, the shock absorber 24 and the solid-state battery 15 share the medium container 21, the medium driving device 22 and the electronic control unit 23, so as to minimize the redundant components of the vehicle design, simplify the design and reduce the cost.

[0056] In some embodiments, referring to FIG. 5, the medium container 21 can include a first medium storage area 211 and a second medium storage area 212, both of which can be used to store pressure medium, wherein the first medium storage area 211 is in communication with the pressurizing cavity 14, the second medium storage area 212 is in communication with the shock absorber 24 of the suspension 2, and the volumes of the first medium storage area 211 and the second medium storage area 212 can be the same or different.

[0057] In this way, when the shock absorber 24 and the solid-state battery 15 both need to increase pressure, the pressure medium storage transmission between the pressurizing cavity 14 and the medium container 21 and the pressure medium storage transmission between the shock absorber 24 and the medium container 21 do not interfere with each other, which is conducive to further improving the reliability of the pressure regulating system 100.

[0058] In some embodiments, referring to FIG. 6, the containing cavity 13 and the pressurizing cavity 14 are arranged along a first direction, which can be the length direction or the width direction of the box body 11, the solid-state battery 15 is a plurality of solid-state batteries 15, and the projections of the plurality of solid-state batteries 15 in a reference plane are within the projection of the pressure regulating member 12 in the reference plane, and the reference plane is perpendicular to the first direction.

[0059] For example, the projections of the plurality of solid-state batteries 15 in the reference plane can coincide with each other, and the projection of the pressure regulating member 12 in the reference plane coincides with the projection of the adjacent solid-state battery 15 in the reference plane, in other words, the plurality of solid-state batteries 15 and the pressure regulating member 12 are stacked along the thickness direction of the solid-state battery 15; or the projections of the plurality of solid-state batteries 15 in the reference plane can not coincide with each other, but the overall projection of the plurality of solid-state batteries 15 in the reference plane coincides with the projection of the pressure regulating member 12 in the reference plane, in other words, the thickness direction of the plurality of solid-state batteries 15 is perpendicular to the pressure regulating member 12.

[0060] In this way, the pressure regulating member 12 can uniformly apply pressure to different regions of a single solid-state battery 15, and the pressure regulating member 12 can uniformly apply pressure to a plurality of solid-state batteries 15, which is conducive to improving the consistency of the electrical performance of each solid-state battery 15.

[0061] In some embodiments, the plurality of solid-state batteries 15 are arranged side by side along the first direction, and the first direction is parallel to the thickness direction of the solid-state battery 15. In this way, the pressure regulating member 12 can uniformly apply pressure to different regions of a single solid-state battery 15, and the pressure regulating member 12 can uniformly apply pressure to a plurality of solid-state batteries 15, which is conducive to improving the consistency of the electrical performance of each solid-state battery 15.

[0062] As shown in FIG. 6, taking the solid-state battery 15 as a cuboid as an example: a plurality of solid-state batteries 15 can be arranged in a first direction, that is, the thickness direction of the solid-state battery 15, at this time, the solid-state battery 15 located in the uppermost layer of the plurality of solid-state batteries 15 is also the side surface with the largest area in contact with the pressure adjusting member 12 along the thickness direction, when the medium container 21 injects the pressure medium into the pressurizing cavity 14, the pressure adjusting member 12 is pressed against the solid-state battery 15 adjacent to it under the action of the pressure medium, and the pressure is transmitted to other solid-state batteries 15 one by one by the solid-state battery 15, and since the projection of the solid-state battery 15 in the reference plane is within the projection of the pressure adjusting member 12 in the reference plane, that is, the pressure adjusting member 12 covers the solid-state battery 15, so that the pressure adjusting member 12 can uniformly apply pressure to different areas of the solid-state battery 15.

[0063] In some embodiments, referring to FIG. 6, the pressure adjusting system 100 can further include a detection unit 25, the detection unit 25 is used to detect the working condition parameters of the solid-state battery 15, and the electronic control unit 23 controls the operating state of the medium driving device 22 according to the working condition parameters to adjust the pressure medium in the pressurizing cavity 14. In this way, the pressure adjusting demand of the solid-state battery 15 can be determined according to the working condition parameters, so that the electronic control unit 23 controls the medium driving device 22 to operate to adjust the pressure medium in the pressurizing cavity 14, thereby accurately applying pressure to the solid-state battery 15 in real time, and ensuring the optimal performance of the solid-state battery 15.

[0064] In some embodiments, the working condition parameters can include the pressure and temperature of the solid-state battery 15, and the detection unit 25 includes: a pressure detection device and a temperature detection device. The pressure detection device can be a pressure sensor, and the pressure detection device is arranged in the box body 11 to detect the pressure of the solid-state battery 15 from the pressure adjusting member 12; the temperature detection device can be a temperature sensor, and the temperature detection device is arranged in the box body 11 to detect the temperature of the solid-state battery 15.

[0065] The electronic control unit 23 is in communication connection with the pressure detection device and the temperature detection device respectively, so as to control the operating state of the medium driving device 22 according to the detection results of the pressure detection device and the temperature detection device. In this way, the detection unit 25 can collect the temperature and pressure of the solid-state battery 15 to provide control basis for the electronic control unit 23.

[0066] In some embodiments, the pressure detection device and the temperature detection device are an integrated detection structure, in other words, the integrated detection structure integrates the pressure detection function and the temperature detection function. In this way, it is beneficial to improve the integration of the detection unit 25, reduce the space occupation, and facilitate the installation of the detection unit 25 in the battery pack 1.

[0067] Further, an integrated detection structure can be arranged between the solid-state battery 15 and the pressure adjusting member 12, so that the integrated detection structure can detect the temperature and the pressure borne by the solid-state battery 15.

[0068] Alternatively, the integrated detection structure can be embedded in the pressure adjusting member 12, that is, the pressure adjusting member 12 and the integrated detection structure are integrated, so that the reliability of the integrated detection structure can be improved.

[0069] In some embodiments, the working condition parameters can further include the voltage, the current, the state of charge (SOC), the state of health (SOH) and the like of the solid-state battery 15, and the detection unit 25 can be connected with the positive electrode port 16 and the negative electrode port 17 of the battery pack 1 to detect the above parameters. After detecting the above parameters, the detection unit 25 can send the parameters to the electronic control unit 23, and the electronic control unit 23 can output a control instruction to the medium driving device 22 according to a predetermined pressure control strategy, and the medium driving device 22 can adjust the amount of the pressure medium injected into the pressurizing cavity 14 of the battery pack 1 according to the control instruction, so as to adjust the pressure applied to the solid-state battery 15.

[0070] In some embodiments, in combination with FIGS. 1-4, the pressure adjusting circuit 20 can further include a pipeline system 100, which can include a main pipeline 201, a first branch pipeline 202 and a second branch pipeline 203. The medium driving device 22 and the medium container 21 are connected through the main pipeline 201, the pressurizing cavity 14 of the box body 11 is connected through the first branch pipeline 202 and the main pipeline 201, and the second branch pipeline 203 is one-to-one corresponding to the dampers 24. Each of the dampers 24 is connected with the main pipeline 201 through the corresponding second branch pipeline 203, so that the medium driving device 22 can control the connection state and the pressure medium flow size of the first branch pipeline 202 and the second branch pipeline 203 respectively, so as to adjust the pressure of the solid-state battery 15 and the dampers 24 respectively.

[0071] Optionally, the first branch pipeline 202 and the second branch pipelines 203 are respectively provided with on-off control valves 26 to control the flow state of the pressure medium. In this way, the connection state, the pressure medium flow size and the transmission direction of the first branch pipeline 202 and the second branch pipelines 203 can be accurately and flexibly controlled according to the pressure requirements of the battery pack 1 and the dampers 24, so as to avoid the interference between the pressure adjustment of the solid-state battery 15 and the dampers 24. Optionally, the on-off control valves 26 on the first branch pipeline 202 and the second branch pipelines 203 are all electronic control valves, and are all connected with the electronic control unit 23, so that the electronic control unit 23 can automatically control the operation state of each on-off control valve 26 according to the pressure requirements of the solid-state battery 15 and the dampers 24, and the degree of automation of the pressure adjustment of the solid-state battery 15 is improved.

[0072] Optionally, in combination with FIGS. 1-3, the plurality of second branches 203 are respectively provided with an opening adjusting valve 30 to adjust the flow size of the pressure medium in the corresponding second branch 203, so as to better adjust the pressure of each shock absorber 24.

[0073] In some embodiments, in combination with FIGS. 1-3, the pressure regulating system 100 can further include a first pressure relief valve 27 and a second pressure relief valve 28. The first pressure relief valve 27 is in communication with the first branch 202, and the second pressure relief valve 28 is in communication with the second branch 203. In this way, when the pressure in the first branch 202 exceeds the normal range, the first pressure relief valve 27 can be opened to release pressure; when the pressure in the second branch 203 exceeds the normal range, the second pressure relief valve 28 can be opened to release pressure, thereby ensuring the safety of the pressure regulating system 100.

[0074] In some embodiments, in combination with FIGS. 1-3, the medium container 21 is a liquid storage tank, the pressure medium is hydraulic oil, and the medium driving device 22 is a hydraulic pump. The liquid storage tank can be used as a component for storing hydraulic oil. According to the need to adjust the pressure by the hydraulic pump, the hydraulic oil can be injected into the pressurizing cavity 14 through the first branch 202 connecting the liquid storage tank and the pressurizing cavity 14, thereby achieving the effect of uniformly increasing the pressure on the solid-state battery 15. That is, the suspension 2 of the present embodiment is a hydraulic suspension 2, and correspondingly, the shock absorber 24 can be a hydraulic shock absorber 24.

[0075] The hydraulic pump can be arranged on the downstream side of the medium container 21 and on the upstream side of the first branch 202 and the second branch 203. In this way, the hydraulic pump can drive the flow of pressure medium between the pressurizing cavity 14 and the liquid storage tank, and also drive the flow of pressure medium between the shock absorber 24 and the liquid storage tank, thereby achieving the sharing of the hydraulic pump and the liquid storage tank by the battery pack 1 and the suspension 2.

[0076] It can be understood that when the hydraulic pump drives the hydraulic oil to flow from the liquid storage tank to the pressurizing cavity 14, the hydraulic pump can be turned off after the pressure of the solid-state battery 15 stabilizes, so as to maintain the operation of the solid-state battery 15 under a certain pressure.

[0077] In some embodiments, in combination with FIGS. 1-3, the pressure regulating system 100 can further include a one-way valve 29 arranged on the main pipeline 201 and located on the downstream side of the liquid outlet direction of the hydraulic pump relative to the medium container 21, so as to ensure that the hydraulic oil cannot flow back when the liquid storage tank injects hydraulic oil into the pressurizing cavity 14 or the shock absorber 24, thereby ensuring the smoothness of the liquid injection process.

[0078] In some embodiments, in combination with FIG. 1-3, the pressure regulating system 100 can further comprise an oil return branch 204. Wherein, an inlet of the oil return branch 204 is in communication with the main pipeline 201, and the inlet is located at a downstream side of the one-way valve 29 and an upstream side of the first branch 202 and the second branch 203, an outlet of the oil return branch 204 is in communication with the medium container 21. An oil return valve 31 is arranged in the oil return branch 204 to control the opening and closing of the oil return branch 204. In this way, when the solid-state battery 15 or the shock absorber 24 needs to reduce pressure, the oil return valve 31 can be controlled to open, so that the hydraulic oil in the solid-state battery 15 or the shock absorber 24 can flow back to the liquid storage tank through the oil return branch 204, which is conducive to the recycling of the hydraulic oil and improves the reliability of the pressure regulating system 100.

[0079] Continuing to refer to FIG. 4, in other alternative embodiments, the medium container 21 is a gas storage tank, the pressure medium is compressed air, and the medium driving device 22 is an air compressor, that is, the suspension 2 in the present embodiment is an air suspension, and correspondingly, the shock absorber 24 can be an air spring shock absorber.

[0080] Referring to FIG. 4, in some embodiments, considering that when the air compressor is arranged between the medium container 21 and the gas storage tank, the air flow after being compressed by the air compressor will directly flow to the pressurized cavity 14 of the box body 11, and the air pressure at the outlet of the air compressor is unstable, which causes the air pressure of the pressurized cavity 14 to be unstable, and it is difficult to apply stable pressure to the solid-state battery 15. Therefore, in the present embodiment, the air compressor can be arranged at the upstream side of the medium container 21, in other words, the air compressor and the box body 11 are located on the two sides of the medium container 21 in the air flow direction, so that the air compressed by the air compressor first flows to the gas storage tank, and the gas storage tank plays a role of buffering and stabilizing the air flow. The gas flowing from the gas storage tank to the gas part of the pressurized cavity 14 is no longer compressed, so that the gas flow with stable air pressure can be input from the gas storage tank to the pressurized cavity 14, and stable pressure can be applied to the solid-state battery 15.

[0081] Some specific embodiments of the pressure regulating system 100 of the present application are described below.

[0082] Embodiment One

[0083] Referring to FIG. 2, the pressure regulating system 100 of the present embodiment comprises the battery pack 1, the suspension 2 and the detection unit 25.

[0084] The battery pack 1 comprises a box body 11 and solid-state batteries 15, the inner cavity of the box body 11 is provided with a pressure adjusting member 12, the pressure adjusting member 12 can separate the inner cavity of the box body 11 into a containing cavity 13 and a pressurizing cavity 14, the containing cavity 13 and the pressurizing cavity 14 are arranged along a first direction, a plurality of solid-state batteries 15 are arranged side by side in the containing cavity 13 along the first direction, the first direction is parallel to the thickness direction of the solid-state battery 15, the pressurizing cavity 14 is used for containing hydraulic oil, the cavity wall of the pressurizing cavity 14 is provided with a communication port 18, and the pressure adjusting member 12 is configured to move relative to the box body 11 under the action of the hydraulic oil.

[0085] The detection unit 25 is arranged on the box body 11 and is used to detect the working condition parameters of the solid-state batteries 15.

[0086] The suspension 2 is a hydraulic suspension 2, the pressure regulating circuit 20 of the hydraulic suspension 2 comprises a liquid storage tank, hydraulic pumps, a plurality of shock absorbers 24 and electronic control units 23, and the hydraulic pumps and the electronic control units 23 are both two, one of the hydraulic pumps drives the hydraulic oil to flow between the liquid storage tank and the pressurizing cavity 14 of the battery pack 1, and the other hydraulic pump drives the hydraulic oil to flow between the liquid storage tank and the shock absorbers 24, the first electronic control unit 23a controls the hydraulic oil to flow between the medium container 21 and the battery pack 1 according to the working condition parameters of the solid-state batteries 15, and the second electronic control unit 23b controls the hydraulic oil to flow between the medium container 21 and the shock absorbers 24 according to the pressure regulating requirements of the shock absorbers 24.

[0087] Embodiment two

[0088] Referring to FIG. 3, the main structure of the present embodiment is the same as that of the first embodiment, and the difference lies in that, in the present embodiment, there is only one hydraulic pump, which can drive the hydraulic oil to flow between the medium container 21 and the battery pack 1, and also can drive the hydraulic oil to flow between the medium container 21 and the shock absorbers 24, so that the hydraulic suspension 2 and the solid-state batteries 15 share the hydraulic pump.

[0089] Embodiment three

[0090] Referring to FIG. 1, the main structure of the present embodiment is the same as that of the second embodiment, and the difference lies in that, in the present embodiment, there is only one electronic control unit 23, which can control the hydraulic oil to flow between the medium container 21 and the battery pack 1 according to the pressure regulating requirements of the solid-state batteries 15, and also can control the hydraulic oil to flow between the medium container 21 and the shock absorbers 24 according to the pressure regulating requirements of the shock absorbers 24, so that the hydraulic suspension 2 and the solid-state batteries 15 can share the electronic control unit 23.

[0091] Embodiment four

[0092] Referring to FIG. 5, the main structure of the embodiment is the same as that of Embodiment Three, and the difference lies in that the liquid storage tank can include a first medium storage area 211 and a second medium storage area 212, both of which can be used to store pressure medium, wherein the first medium storage area 211 is in communication with the pressurized cavity 14 of the battery pack 1, and the second medium storage area 212 is in communication with the shock absorber 24 of the suspension 2. In this way, when the shock absorber 24 and the solid-state battery 15 both need to increase the pressure, the pressure medium storage transmission between the pressurized cavity 14 and the liquid storage tank and the pressure medium storage transmission between the shock absorber 24 and the liquid storage tank do not interfere with each other, which is conducive to further improving the reliability of the pressure regulating system 100.

[0093] Embodiment Five

[0094] Referring to FIG. 4, the main structure of the embodiment is the same as that of Embodiment Three, and the difference lies in that the suspension 2 is an air suspension 2, the medium container 21 is a gas storage tank, the pressure medium is compressed air, and the medium driving device 22 is an air compressor.

[0095] Comparative Example One

[0096] The solid-state battery 15 is fixedly installed in a clamp with a certain strength, and the pressure is applied to the solid-state battery 15 by adjusting the gap of the clamp.

[0097] Comparative Example Two

[0098] The compressed spring is used to apply pressure to the solid-state battery, and no pressure medium is introduced.

[0099] As can be seen from FIG. 6, if the spring is used as a buffer material for adjusting the pressure borne by the solid-state battery 15, the total thickness d tol of the battery pack 1 is the sum of the thickness d stack of the battery and the thickness d ph of the spring, that is, d tol =d stack +d ph .

[0100] In combination with the figures, Comparative Example Two is analyzed as follows: assuming that the compression ratio of the spring is 1 / 3, the length of the spring needs to be 3 times the compressible length, that is, d ph =3×d exp , and the maximum value of the compressible length of the spring is not less than the expansion thickness of the battery. Assuming that the compressible length of the spring is equal to the expansion thickness d expIf the maximum value of the compressible length of the spring is lower than the thickness of the battery expansion, the spring is in a long-term limit compression state, which affects the service life on the one hand, and cannot play the effect of increasing pressure adjustment on the other hand, and when the compressible length of the spring is equal to the thickness of the battery expansion, the maximum energy density value of the battery using the spring is reached.

[0101] Assuming that the solid-state battery 15 cell expansion thickness d exp is 20% of the initial thickness d stack of the battery, that is, d exp = 0.2 x d stack ;

[0102] The total thickness d tol of the actual battery pack 1 is d stack + 3 x 0.2 x d stack＝ 1.6d stack , which indicates that an additional 60% of the battery thickness needs to be designed to bear the 20% volume expansion of the battery, and 40% of the thickness is used to accommodate the spring, which will cause the space utilization of the battery pack 1 to decrease and the volume energy density to decrease.

[0103] The following table is the cycle performance test result table obtained by the inventor of the present application after performing cycle performance tests on the third embodiment, the fifth embodiment, and the comparative example 1 and the comparative example 2.

[0104] The cycle performance test method of the solid-state battery 15 is as follows: the battery pack 1 is charged at 1C, discharged at 1C, and cycled at 25°C, and the pressure is controlled according to the constant pressure strategy during the cycle process of the solid-state battery 15, and the 60KWh battery pack 1 is tested on the test bench for constant pressure cycle performance test.

[0105] As can be seen from the above table, the pressure adjustment system 100 of the embodiment of the present application adopts Meanwhile, the operating pressure of the all-solid-state battery 15 proposed in the present scheme can be adjusted in real time, and the on-demand distribution is realized, which can significantly improve the cycle performance of the battery. Although the spring is used as the pressure buffer for the pressure application mode, the cycle performance of the battery is slightly improved, but compared with the scheme of adjusting the pressure according to the working condition of the battery in real time, the improvement of the cycle performance of the battery is not as good as the scheme proposed in the present patent.

[0106] The energy storage device of the second aspect of the present application is described below.

[0107] The energy storage device of the present embodiment can include the solid-state battery 15 and the pressure adjustment system 100 in the above embodiments, wherein the solid-state battery 15 can be multiple, and the solid-state battery 15 is arranged in the accommodating cavity 13 of the box body 11, and the multiple solid-state batteries 15 can be connected in series, in parallel, or in series and parallel according to the needs.

[0108] The energy storage device of the embodiment adopts the solid-state battery 15 as the energy storage device, which can improve the energy density of the energy storage device and store more energy. The solid-state battery 15 is provided with the pressure adjusting system 100 in the above embodiment, so that the charging and discharging process of the solid-state battery 15 is more stable and reliable, and the energy can be better output, and the electrical performance of the energy storage device is improved.

[0109] The vehicle of the second aspect of the application is described below.

[0110] The vehicle of the embodiment can be a new energy vehicle or a hybrid vehicle. The vehicle can include a vehicle body and the pressure adjusting system 100 of the above embodiment, and the pressure adjusting system 100 is arranged on the vehicle body.

[0111] According to the vehicle of the embodiment of the application, the solid-state battery 15 is used as the power source, the energy density is higher, the vehicle endurance can be increased, and the user experience is improved. The energy storage device in the above embodiment is provided, so that the charging and discharging process of the solid-state battery 15 is more stable and reliable, the energy can be better output, the integration of the vehicle is improved, the pressure supply device for the solid-state battery 15 is saved, the redundant components of the vehicle design can be reduced, the design is simplified, and the cost is reduced.

[0112] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0113] It should be noted that the embodiments referred to in the specification as "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments" and the like can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in combination with other embodiments that are explicitly or implicitly described.

[0114] Generally, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic of singular meaning, or can be used to describe the combination of features, structures or characteristics of plural meaning. Similarly, at least partly according to the context, terms such as "a" or "said" can be understood as conveying singular usage or conveying plural usage.

[0115] It should be readily understood that "on," "over," and "above" in the present disclosure should be interpreted in the broadest manner such that "on" means not only "directly on" but also includes the meaning of "on" with intervening features or layers therebetween, and "over" or "above" includes not only the meaning of "over" or "above" but also the meaning of "over" or "above" with no intervening features or layers therebetween (i.e., directly on).

[0116] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit the same; even though the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions recorded in the foregoing embodiments, or equivalent replacements can be made to some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pressure regulating system (100) for a solid-state battery, characterized in that, Comprise: a box (11), an inner cavity of the box (11) is provided with a pressure adjusting member (12), the pressure adjusting member (12) separates the inner cavity of the box (11) into a containing cavity (13) for containing the solid-state battery (15) and a pressurizing cavity (14) for containing pressure medium; A suspension (2) comprising a pressure adjusting circuit (20) in communication with the pressurizing cavity (14); The pressure adjusting circuit (20) adjusts the pressure of the pressure medium in the pressurizing cavity (14) to adjust the pressure applied by the pressure adjusting member (12) to the solid-state battery (15).

2. The pressure regulating system (100) of a solid state battery according to claim 1, characterized in that, The pressure adjusting circuit (20) comprises a medium container (21) for storing the pressure medium, a medium driving device (22), a plurality of shock absorbers (24) and an electronic control unit (23), the medium container (21) is in communication with the pressurizing cavity (14) and the shock absorber (24) respectively; The medium driving device (22) is configured to drive the pressure medium to inject from the medium container (21) into the pressurizing cavity (14), or to flow back from the pressurizing cavity (14) to the medium container (21); The electronic control unit (23) is configured to control the operating state of the medium driving device (22) according to the pressure adjusting requirement of the solid-state battery (15).

3. The pressure adjusting system (100) of the solid-state battery according to claim 2, wherein The medium driving device (22) is further configured to drive the pressure medium to inject from the medium container (21) into the shock absorber (24), or to flow back from the shock absorber (24) to the medium container (21); and / or The electronic control unit (23) is further configured to control the operating state of the medium driving device (22) according to the pressure adjusting requirement of the shock absorber (24).

4. The pressure regulating system (100) of a solid state battery according to claim 2 or 3, characterized in that The containing cavity (13) and the pressurizing cavity (14) are arranged along a first direction; The solid-state battery (15) is a plurality of, the projection of the plurality of solid-state batteries (15) in a reference plane is in the projection of the pressure adjusting member (12) in the reference plane, The reference plane is perpendicular to the first direction.

5. The pressure regulating system (100) of a solid-state battery according to claim 4, characterized in that, A plurality of the solid-state batteries (15) are arranged side by side along the first direction, and the first direction is parallel to the thickness direction of the solid-state battery (15).

6. The pressure regulating system (100) of a solid state battery according to any one of claims 2-5, characterized in that, Further comprising a detection unit (25) for detecting a working condition parameter of the solid-state battery (15); The electronic control unit (23) controls the operating state of the medium driving device (22) according to the working condition parameter to adjust the pressure medium in the pressurizing cavity (14).

7. The pressure regulating system (100) of a solid-state battery according to claim 6, characterized in that The working condition parameter comprises the pressure and temperature of the solid-state battery (15), and the detection unit (25) comprises: A pressure detection device provided on the box (11) to detect the pressure of the solid-state battery (15); A temperature detection device provided on the box (11) to detect the temperature of the solid-state battery (15); The electronic control unit (23) is in communication connection with the pressure detection device and the temperature detection device respectively, so as to control the running state of the medium driving device (22) according to the detection results of the pressure detection device and the temperature detection device.

8. The pressure regulating system (100) of a solid-state battery according to claim 7, characterized in that The pressure detection device and the temperature detection device are an integrated detection structure.

9. The pressure regulating system (100) of a solid-state battery according to claim 8, characterized in that, The integrated detection structure is arranged between the solid-state battery (15) and the pressure regulating member (12); or, The integrated detection structure is embedded in the pressure regulating member (12).

10. The pressure regulating system (100) of a solid state battery according to any one of claims 2-9, characterized in that, The pressure regulating circuit (20) further comprises a main pipeline (201), a first branch pipeline (202) and a second branch pipeline (203), the medium driving device (22) and the medium container (21) are communicated through the main pipeline (201), the battery pack (1) is communicated with the main pipeline (201) through the first branch pipeline (202), and the second branch pipeline (203) is a plurality of corresponding dampers (24), each of the dampers (24) is communicated with the main pipeline (201) through the corresponding second branch pipeline (203); The first branch pipeline (202) and the plurality of second branch pipelines (203) are respectively provided with on-off control valves (26) to control the flow state of the pressure medium.

11. The pressure regulating system (100) of a solid-state battery according to claim 10, characterized in that Further comprising: A first pressure relief valve (27) in communication with the first branch pipeline (202); A second pressure relief valve (28) in communication with the second branch pipeline (203).

12. The pressure regulating system (100) of a solid-state battery according to claim 10, characterized in that, The medium container (21) is a liquid storage tank, the pressure medium is hydraulic oil, the medium driving device (22) is a hydraulic pump, the hydraulic pump is arranged on the downstream side of the medium container (21), and the first branch pipeline (202) and the second branch pipeline (203) are arranged on the upstream side.

13. The pressure regulating system (100) of a solid-state battery according to claim 12, characterized in that Further comprising: A one-way valve (29) arranged in the main pipeline (201) and located on the downstream side of the hydraulic pump in the liquid outlet direction of the medium container (21).

14. The pressure regulating system (100) of a solid-state battery according to claim 13, characterized in that, The pressure regulating circuit (20) further comprises an oil return branch pipeline (204), the inlet of the oil return branch pipeline (204) is in communication with the main pipeline (201), the inlet is arranged on the downstream side of the one-way valve (29) and the upstream side of the first branch pipeline (202) and the second branch pipeline (203), and the outlet of the oil return branch pipeline (204) is in communication with the medium container (21); An oil return valve (31) arranged in the oil return branch pipeline (204) to control the on-off of the oil return branch pipeline (204).

15. The pressure regulating system (100) of a solid state battery according to any one of claims 10-14, characterized in that, The medium container (21) is a gas storage tank, the pressure medium is compressed air, and the medium driving device (22) is an air compressor.

16. The pressure regulating system (100) of a solid-state battery according to claim 15, characterized in that, The air compressor is arranged on the upstream side of the medium container (21).

17. An energy storage device, comprising: Comprising: A solid-state battery (15); The pressure regulating system (100) of the solid-state battery of any one of claims 1-16, the solid-state battery (15) is arranged in the containing cavity (13) of the box body (11).

18. A vehicle characterized by comprising: Comprising: A vehicle body; The energy storage device of claim 17, wherein the energy storage device is disposed in the vehicle body.

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