A pressurization system of a battery, a solid-state battery, a battery pack, and a vehicle

Abstract

The application discloses a battery pressurization system, a solid-state battery, a battery pack and a vehicle, and relates to the technical field of vehicles, and aims to improve the ability to control the discharge rate of a battery. The battery pressurization system comprises a shell and a pressure control device. An accommodating cavity is formed in the interior of the shell. The pressure control device is arranged in the accommodating cavity, and the pressure control device is used for filling pressure medium into the accommodating cavity to increase the internal pressure of the accommodating cavity or discharging pressure medium from the accommodating cavity to reduce the internal pressure of the accommodating cavity. According to the battery pressurization system of the application, by filling or discharging pressure medium into the accommodating cavity through the pressure control device, the pressure that the battery can bear in the accommodating cavity is controlled, so that the battery can bear sufficient pressure, the range of the controllable discharge rate of the battery is improved, and the safety performance of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a battery pressurization system, a solid-state battery, a battery pack, and a vehicle. Background Technology

[0002] In existing technologies, flexible bags are typically used as pressure bags. However, flexible bags have limited pressure resistance and cannot apply enough pressure to the battery to tightly connect the positive and negative terminals, resulting in the battery not being able to discharge fully and limiting the ability to increase the battery's discharge rate. Summary of the Invention

[0003] The purpose of this invention is to provide a battery pressurization system, a solid-state battery, a battery pack, and a vehicle, with the aim of improving the ability to control the discharge rate of the battery.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, the present invention provides a battery pressurization system, comprising: a housing, wherein a receiving cavity is formed inside the housing; and a pressure control device, wherein the pressure control device is at least partially disposed in the receiving cavity, the pressure control device being used to fill the receiving cavity with a pressure medium to increase the internal pressure of the receiving cavity, or to discharge the pressure medium from the receiving cavity to decrease the internal pressure of the receiving cavity.

[0006] According to the pressurization system of the battery of the present invention, the pressure that the battery can withstand within the receiving cavity is controlled by filling or discharging a pressurized medium into the receiving cavity using a pressure control device. Therefore, compared with conventional batteries, the battery can withstand sufficient pressure, increasing the range of controllable battery discharge rates and improving battery safety performance.

[0007] In some embodiments, the pressure control device includes a flow path that passes through the housing to connect the receiving cavity to the outside, and the flow path serves as a passage for the pressure medium.

[0008] In some embodiments, the battery pressurization system further includes a pressure detection device disposed within the containment cavity, the pressure detection device being connected to a pressure control device, and the pressure control device pressurizing or depressurizing the containment cavity based on the detection result of the pressure detection device.

[0009] In some embodiments, the housing is cylindrical in shape.

[0010] In some embodiments, the battery pressurization system further includes a cover located on one side of the housing in a first direction; wherein the first direction is the axial direction of the housing.

[0011] In some embodiments, the battery pressurization system further includes: a first connector disposed on the cover, the first connector being connected to a pressure detection device for transmitting low-pressure signals to the outside.

[0012] In some embodiments, the battery pressurization system further includes an explosion-proof valve mounted on the cover.

[0013] In some embodiments, the cavity is provided with at least one partition connected to the housing, the partition extending along a first direction, and a low-pressure processing system is provided on the partition.

[0014] On the other hand, the present invention provides a solid-state battery, comprising: at least one cell module fixed to a separator in a receiving cavity; and a pressurization system according to the battery described above, the pressurization system being used to apply pressure to the cell module.

[0015] In some embodiments, the solid-state battery further includes: a connector connected between cell modules for connecting the cell modules in series or in parallel; and a second plug-in disposed on the cover of the housing for outputting current and voltage.

[0016] In some embodiments, the battery pressurization system further includes a controller disposed within the housing cavity, the controller being used to detect the total current and control the power supply or disconnection of the battery.

[0017] In some embodiments, the battery module includes a plurality of battery cells stacked along a second direction of the housing, wherein the first direction and the second direction are perpendicular to each other.

[0018] In another aspect, the present invention provides a battery pack including the solid-state battery as described above, or a pressurization system for the battery as described above.

[0019] In another aspect, the present invention provides a vehicle including the battery pack as described above, or the solid-state battery as described above, or the battery pressurization system as described above.

[0020] It is understood that the beneficial effects of the battery pressurization system, solid-state battery, battery pack and vehicle provided in the above embodiments of the present invention can be referred to the beneficial effects of the battery pack mentioned above, and will not be repeated here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a structural schematic diagram of a vehicle provided according to some embodiments;

[0023] Figure 2 This is a schematic diagram of a solid-state battery according to some embodiments;

[0024] Figure 3 This is a schematic diagram of a pressurization system provided according to some embodiments;

[0025] Figure 4 This is another structural schematic diagram of a pressurization system provided according to some embodiments;

[0026] Figure 5 This is a schematic diagram of a housing according to some embodiments;

[0027] Figure 6 This is a schematic diagram of another structure of a solid-state battery according to some embodiments;

[0028] Figure 7 This is a schematic diagram of a battery cell module provided according to some embodiments;

[0029] Figure 8 This is a schematic diagram of a battery cell provided according to some embodiments.

[0030] Figure label:

[0031] 100. Pressurization system;

[0032] 1. Housing; 11. Receiving cavity; 111. Partition; 12. Cover; 2. Pressure control device; 21. Flow guide path; 3. Pressure detection device; 4. Controller; 5. First connector; 6. Explosion-proof valve;

[0033] 200. Solid-state batteries;

[0034] 10. Battery cell module; 101. Battery cell; 20. Connector; 30. Second connector;

[0035] 300. Vehicles. Detailed Implementation

[0036] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0037] In the description of this disclosure, it should be understood that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0038] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "exemplary," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0039] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0040] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the term "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0041] In this disclosure, the meanings of “on,” “above,” and “above” should be interpreted in the broadest possible sense, such that “on” means not only “directly on” something, but also includes “on” something with intermediate features or layers in between, and that “above” or “above” means not only “above” or “above” something, but also “above” or “above” something without intermediate features or layers in between (i.e., directly on something).

[0042] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0043] This application provides a vehicle 300, such as... Figure 1 As shown, it includes a battery pack according to an embodiment of this application, or a solid-state battery 200 according to an embodiment of this application, or a battery pressurization system 100 according to an embodiment of this application.

[0044] When vehicle 300 is not operating, pressurization system 100 is inactive to prevent battery pack self-discharge. When vehicle 300 is operating, pressurization system 100 activates and increases the battery's discharge rate. This improves vehicle 300's performance and enhances the user experience.

[0045] The pressurization system 100 of the battery described above will be described in detail below.

[0046] On the one hand, such as Figures 2-3 As shown, the present invention provides a battery pressurization system 100, including a housing 1 and a pressure control device 2.

[0047] Specifically, a receiving cavity 11 is formed inside the housing 1. A pressure control device 2 is provided in the receiving cavity 11. The pressure control device 2 is used to fill the receiving cavity 11 with a pressure medium to increase the internal pressure of the receiving cavity 11, or to discharge the pressure medium from the receiving cavity 11 to decrease the internal pressure of the receiving cavity 11.

[0048] For example, in Figure 2 and Figure 3 In the example, the battery is placed inside the receiving cavity 11 of the housing 1. A pressure control device 2 is placed inside the receiving cavity 11, capable of filling it with a pressure medium to ensure the pressure inside the cavity is greater than atmospheric pressure. The housing 1 is typically kept sealed, waterproof, and airtight to prevent pressure leakage and facilitate pressure control. Furthermore, the housing 1 is made of high-strength steel and can withstand pressures of at least 100 MPa. This allows the housing 1 to withstand the significant pressure exerted by the pressure control device 2 after filling the receiving cavity 11 with the pressure medium, thus fully meeting the pressure stability required to improve battery discharge efficiency, ensuring normal battery operation, and enhancing battery safety.

[0049] When the battery needs to discharge, the pressure control device 2 fills the receiving cavity 11 with a pressure medium, making the pressure inside the receiving cavity 11 greater than atmospheric pressure. All surfaces of the battery are compressed by this pressure, reducing the internal gaps and increasing the connection strength between the positive and negative electrodes. This improves the rate at which the battery converts chemical energy into electrical energy, thereby increasing the battery's discharge capacity and efficiency.

[0050] When the battery does not need to discharge, the pressure control device 2 can stop filling the pressure medium into the receiving cavity 11 and discharge the pressure medium from the receiving cavity 11 to depressurize the receiving cavity 11, creating a negative pressure or zero pressure inside the receiving cavity 11. This reduces the pressure on the battery, decreasing the connection between the positive and negative electrodes and the electrolyte inside the battery, resulting in an internal short circuit or increased resistance, thereby preventing self-discharge and reducing battery wear. Simultaneously, it also reduces the pressure on individual cells 101, preventing short circuits between the positive and negative electrodes inside the cell 101. This extends the battery's lifespan while reducing the operating time of the pressure control device and energy consumption. Furthermore, depressurizing the receiving cavity 11 ensures that the pressure inside the receiving cavity 11 remains within a safe pressure range, improving battery safety performance.

[0051] In this embodiment, the specific material of the pressure medium is not limited to meet different needs. For example, the pressure medium can be an inert gas, air, insulating liquid, or other insulating material. After the pressure medium fills the receiving cavity 11, it ensures the normal operation of the battery and avoids dangers such as short circuits.

[0052] In summary, the pressure control device 2 can control the pressure inside the containment cavity 11 according to the battery's discharge demand, and can control the battery's discharge rate over a wide range. It has a simple structure and is conducive to increasing the battery's safety performance.

[0053] According to the battery pressurization system 100 of the present invention, the pressure that the battery can withstand within the receiving cavity 11 is controlled by filling or discharging a pressure medium into the receiving cavity 11 using a pressure control device 2. Therefore, compared with conventional batteries, the battery can withstand sufficient pressure, increasing the range of controllable battery discharge rates and improving battery safety performance.

[0054] In some embodiments, refer to Figure 2 and Figure 3The pressure control device 2 includes a flow path 21, which passes through the housing 1 and connects the receiving cavity 11 to the outside. The flow path 21 serves as a passage for the pressure medium. The flow path 21 is tubular, with one end located inside and connected to the receiving cavity 11, and the other end connected to the outside, allowing the pressure medium to enter the receiving cavity 11 from the outside through the flow path 21. Therefore, when the battery is discharging, the pressure control device can control the flow path 21 to open, allowing the pressure medium to enter the receiving cavity 11 through the flow path 21, making the pressure inside the receiving cavity 11 greater than the external pressure, so that the entire surface of the battery is subjected to pressure. When the battery does not need to discharge, the pressure control device can control the pressure medium inside the receiving cavity 11 to be discharged through the flow path 21, reducing the pressure inside the receiving cavity 11, creating a negative pressure or zero pressure inside the receiving cavity 11. This reduces the pressure on the cell 101, separates the positive and negative electrodes inside the battery, and stops the battery from discharging, preventing energy loss due to self-discharge.

[0055] In summary, the design of the flow path 21 facilitates the flow of the pressure medium and improves the working efficiency of the pressurization system 100 and the battery.

[0056] In some embodiments, for example, in Figure 2 In the example, the battery pressurization system 100 also includes a pressure detection device 3 disposed within the receiving cavity 11. The pressure detection device 3 is connected to a pressure control device 2, which pressurizes or depressurizes the receiving cavity 11 based on the detection results of the pressure detection device 3. The pressure detection device 3 can detect and collect the battery's voltage and temperature, and transmit the detection results to the pressure control device 2. When the battery needs to discharge, the pressure detection device 3 detects that the battery requires a large current and transmits the detection results to the pressure control device 2, causing the pressure control device 2 to open the conduction path 21. This allows the pressure medium to enter the receiving cavity 11 through the conduction path 21, thereby pressurizing the interior of the receiving cavity 11. As a result, all surfaces of the cell 101 can be subjected to pressure, ensuring a tight connection between the positive and negative electrodes of the cell 101 and improving the battery's discharge rate.

[0057] When the pressure detection device 3 detects thermal runaway in the battery, the pressure in the containment cavity 11 needs to be reduced. At this time, the pressure detection device 3 can transmit the pressure reduction command to the pressure control device 2, so that the pressure control device 2 controls the discharge of the pressure medium in the containment cavity 11, thereby short-circuiting or increasing the resistance inside the cell 101 to prevent the spread of thermal runaway and ensure the safety of the battery pack.

[0058] With this setup, the pressure detection device 3 can monitor the battery's voltage and temperature status in real time and transmit the information to the pressure control device 2 in a timely manner, ensuring the battery's safety performance.

[0059] When the battery is discharging, the pressure control device 2 can control the pressure in the containment cavity 11 between 5-40 MPa according to different electrolytes and discharge current requirements, so as to ensure that the pressure in the containment cavity 11 can meet the battery's operating requirements.

[0060] In some embodiments, refer to Figures 2-4 The housing 1 is cylindrical in shape. This design increases the capacity of the housing 1, making it easier to place components such as the battery cell 101, pressure control device 2, and pressure detection device 3 within the receiving cavity 11. When the receiving cavity 11 is filled with a pressurized medium, the inner wall of the cylindrical housing 1 can be subjected to uniform force, reducing friction and resistance, and improving safety performance.

[0061] In some optional embodiments, the shell 1 can also be in the shape of a cuboid, cube, etc., which can fully increase the space capacity and improve the space utilization rate.

[0062] In some embodiments, the battery pressurization system 100 further includes a cover 12 located on one side of the housing 1 in a first direction; wherein, the first direction is the axial direction of the housing 1. For example, in Figures 2-5 In the example, the cover 12 is connected to the housing 1 in a first direction and closes the receiving cavity 11, keeping the receiving cavity 11 of the housing 1 sealed. Figure 4 As shown, the cover 12 is bowl-shaped, and its circumference is tightly connected to the shell 1. The center of the cover 12 protrudes away from the shell 1. This increases the capacity of the cavity 11 and makes the inner wall of the shell 1 under pressure more uniform, thus extending the service life of the shell 1.

[0063] Furthermore, the battery pressurization system 100 also includes a first connector 5, which is disposed on the cover 12 and connected to the pressure detection device 3. Figure 2 and Figure 3 As shown, the pressure detection device 3 transmits pressure signals to the outside world through the first connector 5, enabling the battery to output a low-pressure signal. This facilitates the battery's signal output and ensures its normal operation.

[0064] Furthermore, referring to Figure 2 and Figure 3 The battery pressurization system 100 also includes an explosion-proof valve 6, which is mounted on the cover 12. The explosion-proof valve 6 can detect the pressure in the receiving cavity 11. When the pressure in the receiving cavity 11 is greater than 10 MPa, the pressure in the receiving cavity 11 exceeds the safe pressure range. At this time, the explosion-proof valve 6 can open to release the pressure in the receiving cavity 11, so as to ensure that the battery is within a safe pressure range, improve the battery's safety performance, and extend its service life.

[0065] In some embodiments, the receiving cavity 11 is provided with at least one partition 111 connected to the housing 1, the partition 111 extending along a first direction, and a low-pressure processing system is disposed on the partition 111. For example, in Figure 2 and Figure 5 In the example, the partition 111 extends along the axial direction of the housing 1, and other components can be placed on the partition 111 to facilitate the structural arrangement in the receiving cavity 11 and improve the space utilization of the receiving cavity 11. At the same time, the two sides of the partition 111 in the width direction are fixedly connected to the inner wall of the housing 1, which strengthens the structural strength of the housing 1, increases the bearing capacity of the housing 1 when the pressure in the receiving cavity 11 increases, and extends the service life of the housing 1.

[0066] The partition 111 and the inner wall of the shell 1 can be connected by welding, bolting, or the partition 111 and the shell 1 can be integrally formed to enhance the connection strength between the partition 111 and the shell 1.

[0067] Optionally, such as Figure 2 and Figure 5 As shown, the cavity 11 is provided with a plurality of partitions 111, which are arranged at intervals along a third direction, wherein the third direction, the second direction and the first direction are perpendicular to each other.

[0068] Reference Figure 2 and Figure 5 There are four partitions 111, arranged at intervals to ensure sufficient space between adjacent partitions 111, facilitating the structural arrangement within the cavity 11. (Refer to...) Figure 1 By placing the pressure control device 2, pressure detection device 3, and controller 4 on the partition 111, the space occupied by the pressure control device 2, pressure detection device 3, and controller 4 is saved, and the space utilization rate is improved.

[0069] In some alternative embodiments, the partitions 111 can be arranged in a mesh structure or other shapes to further improve space utilization by placing the cell modules 10 between the partitions 111.

[0070] In some alternative embodiments, components such as the pressure control device 2, the pressure detection device 3, and the controller 4 can be placed outside the housing 1 so that more battery cell modules 10 can be placed in the housing 11, thereby increasing the battery capacity.

[0071] On the other hand, for example, in Figure 2 and Figure 5 In one example, the present invention provides a solid-state battery 200, including at least one cell module 10 and a pressurization system 100 according to the battery described above. Specifically, the cell module 10 is fixed to a separator 111 of a receiving cavity 11. The pressurization system 100 is used to apply pressure to the cell module 10.

[0072] like Figure 2 and Figure 6 As shown, there are three battery cell modules 10, which are placed on multiple partitions 111 and fixed with structural adhesive. The spacing between the partitions 111 is just enough to accommodate the battery cell modules 10, thereby reducing the space occupied by the battery cell modules 10. The pressurization system 100 is also placed in the receiving cavity 11 to facilitate pressurization of the receiving cavity 11.

[0073] Solid-state battery 200 uses a solid electrolyte, which has a high density. For the same volume, solid-state battery 200 has a larger capacity and greater conductivity. When solid-state battery 200 discharges, its positive and negative terminals need to be connected to allow electrons to flow between them. Simultaneously, the chemical energy generated by the chemical reaction in the solid electrolyte is converted into electrical energy, causing the discharge current. Applying pressure to solid-state battery 200 increases the connection strength between the positive and negative terminals, improving its discharge efficiency and facilitating control of the discharge rate, thereby controlling the discharge current to meet usage requirements.

[0074] When the battery needs to discharge, the pressurization system 100 begins to fill the receiving cavity 11 with a pressurized medium, making the pressure inside the receiving cavity 11 greater than atmospheric pressure. At this time, each surface of the cell module 10 is subjected to pressure and is subjected to uniform compression. This arrangement increases the connection strength between the positive and negative electrodes of the cell module 10, improves the rate at which the cell module 10 converts chemical energy into electrical energy, thereby increasing the discharge capacity and discharge efficiency of the cell module 10.

[0075] When the battery does not need to discharge, the pressurization system 100 can stop filling the receiving cavity 11 with the pressurized medium and discharge the pressurized medium from the receiving cavity 11 to reduce the pressure in the receiving cavity 11. This reduces the pressure on the cell module 10, decreases the connection between the positive and negative electrodes and the electrolyte of the cell module 10, and achieves an internal short circuit or increases the resistance of the cell module 10, thereby preventing battery self-discharge. This extends the battery's lifespan while reducing the operating time of the pressurization system 100 and reducing energy consumption. Simultaneously, depressurizing the receiving cavity 11 ensures that the pressure within the receiving cavity 11 remains within a safe pressure range, improving battery safety performance.

[0076] According to the solid-state battery 200 of the present invention, by using a pressurization system 100 in the solid-state battery 200, the positive and negative electrodes of the solid-state battery 200 are tightly connected, thereby improving the discharge efficiency of the solid-state battery 200 and facilitating the control of the discharge rate of the solid-state battery 200, which is beneficial to improving the safety performance of the solid-state battery 200.

[0077] In some embodiments, the solid-state battery 200 further includes a connector 20 and a second plug-in 30. For example... Figure 2 and Figure 3 As shown, connectors 20 are connected between cell modules 10 to connect the cell modules 10 in series or parallel. Connectors 20 are made of conductive material. Connectors 20 are located on one side of the cell modules 10 in the first direction and connect multiple cell modules 10 to achieve parallel or series connection of the cell modules 10. Thus, the solid-state battery 200 can output different voltages and currents, meeting different usage requirements without changing the structural arrangement of the cell modules 10.

[0078] The second connector 30 is located on the cover 12 of the housing 1. The second connector 30 is used to output current and voltage to the outside. The solid-state battery 200 connects the second connector 30 to the outside, enabling the battery to supply power to the outside.

[0079] This setting enables the solid-state battery 200 to work normally, ensuring its proper use and improving the user experience.

[0080] In some embodiments, the battery pressurization system 100 further includes a controller 4 disposed within the receiving cavity 11. The controller 4 is used to detect the total current and control the supply or disconnection of the battery power. Figure 2 As shown, controller 4 can monitor the total current. When the battery current exceeds the safe current value, controller 4 can control the battery to disconnect to ensure battery safety. Simultaneously, controller 4 controls the battery's on / off state. When the battery is operating, controller 4 controls it to begin supplying power. When the battery is not operating, controller 4 can control it to disconnect to reduce energy consumption.

[0081] In some embodiments, the battery module 10 includes a plurality of battery cells 101, which are stacked and arranged along a second direction of the housing 1, wherein the first direction and the second direction are perpendicular to each other.

[0082] Reference Figure 5 , Figure 7 and Figure 8 The third direction is the width direction of the separator 111. The cell module 10 is disposed on the separator 111, and multiple cells 101 are stacked along the width direction of the separator 111, which increases the battery capacity to meet the battery's usage requirements. When the receiving cavity 11 is filled with a pressure medium, the wide side, narrow side, and tab side of the multiple cells 101 are all subjected to pressure, so that the positive and negative electrodes between the multiple cells 101 can make close contact, improve the discharge efficiency of the cell module 10, and facilitate the control of the discharge rate of the cell module 10, thereby improving the working efficiency of the cell module 10 and enhancing the user experience.

[0083] like Figure 2and Figure 8 As shown, each surface of a single cell 101 in the first, second, and third directions can be subjected to pressure, resulting in uniform stress distribution on the cell 101. When the battery discharges, the deformation of the cell 101 under pressure is uniform, preventing significant deformation on any one surface. This avoids the electrolyte in the cell 101 from being compressed too thin, prevents short circuits between the positive and negative electrodes inside the cell 101, extends the lifespan of the cell 101, and improves its safety performance.

[0084] When the cell 101 is a soft-pack cell or an aluminum-cased cell, the pressure inside the cavity 11 will cause the electrode and the solid electrolyte to squeeze each other, increasing the contact area between the active material of the electrode and the solid electrolyte to achieve the purpose of high-current charging and discharging.

[0085] In the embodiments of this application, the following main functions are achieved:

[0086] By introducing a pressure medium into the cavity 11 of the casing 1, a uniform and adjustable pressure can be applied to the entire battery, thereby controlling the discharge rate, self-discharge and other electrical properties, and interrupting thermal runaway.

[0087] By releasing the pressure medium to the outside of the casing 1, the pressure inside the housing 11 is reduced to less than atmospheric pressure, and can even approach a vacuum state. This reduces the pressure on each cell 101, disconnects the contact between the positive and negative electrodes of each cell 101, and interrupts thermal diffusion between individual cells 101 during battery self-discharge or thermal runaway. If the pressure inside the housing 11 becomes too high, or if the pressure detection device 3 fails, causing excessive pressure, the explosion-proof valve 6 can release the pressure to ensure the safety of the solid-state battery 200. Furthermore, its simple structure improves production and assembly efficiency.

[0088] This allows the large and narrow surfaces of cell 101 to be pressed simultaneously, ensuring uniform stress on cell 101 and preventing significant deformation. This also prevents short circuits between the positive and negative electrodes inside cell 101 and extends battery life.

[0089] In another aspect, the present invention provides a battery pack (not shown) including the solid-state battery 200 as described above, or the battery pressurization system 100 as described above.

[0090] According to the battery pack of the present invention, by employing the solid-state battery 200 or the pressurization system 100 described above, the discharge efficiency of the battery pack can be improved, and the safety performance of the battery pack can be enhanced. At the same time, when the battery pack is not in operation, self-discharge of the battery pack can be prevented, and the service life of the battery pack can be extended.

[0091] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery pressurization system (100), characterized in that, include: A housing (1), the interior of which is formed a receiving cavity (11); A pressure control device (2) is at least partially disposed in the receiving cavity (11). The pressure control device (2) is used to fill the receiving cavity (11) with a pressure medium to increase the internal pressure of the receiving cavity (11), or to discharge the pressure medium from the receiving cavity (11) to reduce the internal pressure of the receiving cavity (11).

2. The battery pressurization system (100) according to claim 1, characterized in that, The pressure control device (2) includes a flow path (21) that passes through the housing (1) to connect the receiving cavity (11) to the outside. The flow path (21) serves as a passage for the pressure medium.

3. The battery pressurization system (100) according to claim 1, characterized in that, Also includes: A pressure detection device (3) is installed in the receiving cavity (11), the pressure detection device (3) is connected to the pressure control device (2), and the pressure control device (2) pressurizes or depressurizes the receiving cavity (11) according to the detection result of the pressure detection device (3).

4. The battery pressurization system (100) according to claim 1, characterized in that, The shell (1) is cylindrical.

5. The battery pressurization system (100) according to claim 4, characterized in that, It also includes: a cover (12) located on one side of the housing (1) in a first direction; Wherein, the first direction is the axial direction of the housing (1).

6. The battery pressurization system (100) according to claim 5, characterized in that, Also includes: The first connector (5) is disposed on the cover (12) and is connected to the pressure detection device (3) for transmitting low-pressure signals to the outside world.

7. The battery pressurization system (100) according to claim 5, characterized in that, Also includes: An explosion-proof valve (6) is installed on the cover (12).

8. The battery pressurization system (100) according to claim 6, characterized in that, The cavity (11) is provided with at least one partition (111) connected to the housing (1), the partition (111) extends along a first direction, and the low-pressure treatment system is provided on the partition (111).

9. A solid-state battery (200), characterized in that, include: At least one battery cell module (10) is fixed to the partition (111) of the receiving cavity (11); A battery pressurization system (100) according to any one of claims 1-8, the pressurization system (100) being used to apply pressure to the battery cell module (10).

10. The solid-state battery (200) according to claim 9, characterized in that, Also includes: Connector (20), the connector (20) is connected between the battery cell modules (10) for connecting the battery cell modules (10) in series or in parallel; The second connector (30) is disposed on the cover (12) of the housing (1) and is used to output current and voltage to the outside.

11. The solid-state battery (200) according to claim 9, characterized in that, Also includes: A controller (4) is disposed within the receiving cavity (11) and is used to detect the total current and control the power supply or disconnection of the battery.

12. The solid-state battery (200) according to claim 9, characterized in that, The battery module (10) includes a plurality of battery cells (101), which are stacked and arranged along the second direction of the housing (1). Wherein, the first direction and the second direction are perpendicular to each other.

13. A battery pack, characterized in that, include: The solid-state battery (200) according to any one of claims 9-12, or the pressurization system (100) of the battery according to any one of claims 1-8.

14. A vehicle (300), characterized in that, include: The battery pack according to claim 13, or the solid-state battery (200) according to any one of claims 9-12, or the battery pressurization system (100) according to any one of claims 1-8.

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