Battery apparatus and electrical device

Abstract

The present application relates to a battery apparatus and an electrical device. The battery apparatus comprises: a box body, having an accommodating cavity; a solid-state battery cell, disposed in the accommodating cavity and filled with a tracer gas; a force applying assembly, movably disposed on the box body and having a first position pressed against the solid-state battery cell and a second position separated from the solid-state battery cell; and a control assembly, disposed on the box body and communicatively connected to the force applying assembly, the control assembly being configured to be able to control the force applying assembly to switch from the first position to the second position when the concentration of tracer gas in the accommodating cavity reaches a preset value, so that the battery apparatus stops charging and discharging. The force applying assembly of the present application can apply a pre-tightening force to the solid-state battery cell at the first position; when the solid-state battery cell experiences a leak, the control assembly controls the force applying assembly to switch from the first position to the second position, such that a solid-solid contact interface between an electrode sheet and an electrolyte layer is separated, and the battery apparatus can promptly stop charging and discharging.

Description

Battery devices and electrical equipment Related applications

[0001] This application claims priority to Chinese patent application No. 2024230461735, filed on December 10, 2024, entitled "Battery Device and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0003] During the cycle of use, solid-state batteries may leak. In this case, the internal materials of the solid-state battery cell are prone to thermal runaway when in contact with the atmosphere. In addition, the electrolyte of some solid-state battery cells is a sulfide electrolyte, which can easily generate dangerous gases when in contact with the atmosphere, affecting the performance of the solid-state battery. Summary of the Invention

[0004] Based on this, this application provides a battery device and an electrical appliance.

[0005] In a first aspect, this application provides a battery device, including a housing, a solid-state battery cell, a force application component, and a control component. The housing has a receiving cavity; the solid-state battery cell is disposed in the receiving cavity, and the interior of the solid-state battery cell is filled with a tracer gas; the force application component is movably disposed on the housing and has a first position pressing against the solid-state battery cell and a second position separated from the solid-state battery cell; the control component is disposed on the housing and is communicatively connected to the force application component, and the control component is configured to control the force application component to switch from the first position to the second position when the concentration of the tracer gas in the receiving cavity reaches a preset value, so as to stop the battery device from charging and discharging.

[0006] With the above structure, on the one hand, when the battery device is working normally, the force-applying component is in the first position, which can apply a pre-tightening force to the solid-state battery cell. Under the action of the pre-tightening force, the positive and negative electrode plates and the electrolyte layer in the solid-state battery cell are tightly bonded, enabling the solid-state battery cell to be used more stably in cycles. On the other hand, when a leak occurs, the control component can promptly control the force-applying component to switch to the second position, removing the pre-tightening force on the solid-state battery cell. This causes the solid-solid contact interface between the electrode plates and the electrolyte layer in the solid-state battery cell to separate, allowing the battery device to stop charging and discharging in time. Thus, the safety performance of the solid-state battery is improved when a leak occurs.

[0007] In some embodiments, a plurality of solid-state battery cells are included, each solid-state battery cell is arranged along its own thickness direction, and a force-applying component is movably disposed on the housing along the arrangement direction of each solid-state battery cell; in a first position, the force-applying component presses against the solid-state battery cell along the arrangement direction.

[0008] Through the above structure, the force-applying component can simultaneously provide pre-tightening force to each of the arranged solid-state battery cells, making the performance of each solid-state battery cell more stable. At the same time, when the force-applying component removes the pre-tightening force, the pre-tightening force on all solid-state battery cells disappears, enabling the solid-solid contact interface between the electrode and the electrolyte layer of each solid-state battery cell to separate, allowing the battery device to stop charging and discharging in a timely manner.

[0009] In some embodiments, the force-applying component includes a cylinder communicatively connected to a control component, the cylinder being movably disposed on the housing along an arrangement direction and configured to be switchable between a first position and a second position under the control of the control component.

[0010] By setting up cylinders, it is possible to better move and switch between the first position and the second position, and to better press against or separate from each solid-state battery cell, so as to react in time when a solid-state battery cell leaks and control the battery device to stop charging and discharging.

[0011] In some embodiments, the cylinder is disposed along the arrangement direction on the wall of the housing and has a first end located inside the receiving cavity and a second end located outside the receiving cavity; wherein the first end is disposed corresponding to the center position of the large surface of the solid-state battery cell.

[0012] The above structure enables the preload force on the solid-state battery cell to be more uniform, thereby improving stress stability.

[0013] In some embodiments, the battery device further includes a detection component disposed on the housing, the detection component being communicatively connected to the control component, for detecting the concentration of tracer gas in the containment cavity; wherein the detection component is configured to transmit a prompt signal to the control component when the concentration of tracer gas in the containment cavity reaches a preset value.

[0014] By setting up detection components, the concentration and changes of tracer gas in the containment cavity can be detected in a timely manner, so as to more accurately monitor the leakage of the battery device and improve the detection and control accuracy.

[0015] In some embodiments, a pressure relief port communicating with the receiving cavity is provided on the wall of the housing, and the detection component is disposed at the pressure relief port.

[0016] Therefore, placing the detection component at the pressure relief port allows for better detection of the concentration of tracer gas within the containment chamber, thus improving detection accuracy.

[0017] In some embodiments, the control component includes a battery management system disposed within a receiving cavity. The battery management system is communicatively connected to both a detection component and a force application component, and is configured to receive a prompt signal and control the force application component to switch between a first position and a second position.

[0018] With the above structure, the movement of the force-applying components can be controlled more promptly and conveniently to control the normal operation of solid-state battery cells or stop charging and discharging.

[0019] In some embodiments, a solid-state battery cell includes a housing and an electrode assembly disposed inside the housing. The electrode assembly includes a first electrode, an electrolyte layer, and a second electrode stacked together. The electrolyte layer has a first surface and a second surface disposed opposite to each other, and the first surface is fixedly connected to one side surface of the first electrode.

[0020] When the force-applying component is in the first position, the second surface is in contact with the second electrode plate;

[0021] When the force-applying component is in the second position, the second surface separates from the second electrode.

[0022] With the above structure, the electrolyte layer and the second electrode can be smoothly bonded or separated under the action of the force-applying component, thereby flexibly controlling the charging and discharging of solid-state battery cells and stopping the charging and discharging.

[0023] In some embodiments, the tracer gas includes one or more of helium, argon, nitrogen, and hydrogen. This makes the tracer gas easier to detect, thereby enabling a more accurate assessment of leakage in solid-state battery cells and improving the performance of the battery device.

[0024] Secondly, this application also provides an electrical device, including the battery device described above.

[0025] In the initial state, when the force-applying component is in the first position, it can press against the solid-state battery cell and apply a pre-tightening force to the solid-state battery cell, making the electrode and electrolyte layer in the solid-state battery cell more tightly bonded and allowing the solid-state battery cell to cycle more fully. In addition, the solid-state battery cell is filled with tracer gas. When the solid-state battery cell leaks, the tracer gas is discharged into the containment cavity. When the concentration of the tracer gas in the containment cavity reaches or exceeds a preset value, the control component can promptly control the force-applying component to switch from the first position to the second position, canceling the pre-tightening force on the solid-state battery cell, causing the solid-solid contact interface between the electrode and electrolyte layer in the solid-state battery cell to separate, allowing the battery device to stop charging and discharging in time. This improves the safety performance of the solid-state battery in the event of a leak. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0027] Figure 1 is a schematic diagram of the structure of a battery device according to one or more embodiments.

[0028] Figure 2 is a schematic diagram of the structure of a solid-state battery cell in a battery device according to one or more embodiments.

[0029] Figure 3 is a schematic diagram of the structure of the electrode assembly in a battery device according to one or more embodiments.

[0030] Figure 4 is a schematic diagram of the structure of the electrode assembly in a battery device according to one or more embodiments.

[0031] Explanation of reference numerals in the attached drawings: 100, battery device; 10, housing; 20, solid-state battery cell; 30, detection component; 40, force application component; 11, receiving cavity; 12, pressure relief port; 21, shell; 22, electrode assembly; 23, first electrode; 24, electrolyte layer; 25, second electrode; 41, cylinder; a, arrangement direction. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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 application 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 application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0039] Traditional battery cells typically include a casing and an electrode assembly disposed inside the casing. The casing surrounds the electrode assembly and is filled with electrolyte so that the electrode assembly can be fully immersed in the electrolyte.

[0040] Compared to traditional battery cells, solid-state battery cells replace the electrolyte with a solid electrolyte layer sandwiched between the positive and negative electrode plates. Solid-state battery cells offer higher safety and higher energy density, and are therefore being used more and more widely.

[0041] For a solid-state battery cell, the positive electrode, electrolyte layer, and negative electrode are stacked sequentially to form an electrode assembly. That is, the electrolyte layer and the positive and negative electrodes are in solid-solid surface contact. Therefore, it is necessary to ensure that the electrolyte layer can adhere tightly to the positive and negative electrodes on both sides, allowing for stable contact between the electrolyte layer and the electrodes.

[0042] During cyclic use, solid-state battery cells may leak. In this case, the internal materials of the solid-state battery cell are prone to thermal runaway upon contact with the atmosphere. In addition, some solid-state battery cells use sulfide electrolytes. When leaks occur, the electrolyte can easily generate dangerous gases such as hydrogen sulfide upon contact with the atmosphere, affecting the performance of the solid-state battery.

[0043] Based on the above considerations, to address the issue that solid-state batteries are prone to thermal runaway or the generation of hazardous gases when leaking, affecting their performance, one or more embodiments of this application provide a battery device. In its initial state, when the force-applying component is in a first position, it can press against the solid-state battery cell, applying a pre-tightening force to the solid-state battery cell. This results in a tighter fit between the electrode and electrolyte layer in the solid-state battery cell, allowing for more complete battery cell cycling. Furthermore, a tracer gas is filled inside the solid-state battery cell. When a leak occurs, the tracer gas is discharged into a containment cavity. When the concentration of the tracer gas in the containment cavity reaches or exceeds a preset value, the control component can promptly switch the force-applying component from the first position to a second position, removing the pre-tightening force on the solid-state battery cell. This causes the solid-solid contact interface between the electrode and electrolyte layer in the solid-state battery cell to separate, allowing the battery device to stop charging and discharging promptly. This improves the safety performance of the solid-state battery in the event of a leak.

[0044] It should be noted that the battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0045] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0046] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0047] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0048] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0049] Referring to Figure 1, one embodiment of this application provides a battery device 100, including a housing 10, a solid-state battery cell 20, a force application component 40, and a control component (not shown in the figure). The housing 10 has a receiving cavity 11, in which the solid-state battery cell 20 is disposed, and the interior of the solid-state battery cell 20 is filled with tracer gas. The force application component 40 is movably disposed on the housing 10 and has a first position pressing against the solid-state battery cell 20 and a second position separated from the solid-state battery cell 20. The control component is disposed on the housing 10 and communicatively connected to the force application component 40. The control component is configured to control the force application component 40 to switch from the first position to the second position when the tracer gas concentration in the receiving cavity 11 reaches a preset value, so that the battery device 100 stops charging and discharging.

[0050] It should be noted that the housing 10 refers to a structure that provides space for the solid-state battery cell 20 and other functional components in the battery device 100. The housing 10 has a receiving cavity 11 inside, in which the solid-state battery cell 20 is placed, so that the housing 10 can provide a certain degree of protection for the solid-state battery cell 20.

[0051] The housing 10 may include a housing body and a cover. The housing body has an opening, and the cover is capable of sealingly fitting onto the opening of the housing body so that the housing body and the cover together enclose and form a receiving cavity 11. The solid-state battery cell 20 is placed inside the housing body, and then the cover is sealed onto the opening of the housing body to complete the assembly of the housing 10.

[0052] Solid-state battery cell 20 refers to a battery cell with a solid electrolyte, that is, the electrolyte is set as a solid electrolyte layer 24 and sandwiched between the positive electrode and the negative electrode. The electrolyte layer 24 and the positive and negative electrode are both solid contact interfaces.

[0053] Specifically, the solid-state battery cell 20 includes a housing 21 and an electrode assembly 22 disposed within the housing 21. A sealed space is formed inside the housing 21, protecting the electrode assembly 22. Before sealing the housing 21, a tracer gas is filled inside. Specifically, the housing 21 can be evacuated first, and then filled with the tracer gas. This ensures the housing 21 is completely filled with tracer gas. When the solid-state battery cell 20 leaks, the tracer gas inside the housing 21 leaks out. By detecting the tracer gas, the leakage status of the solid-state battery cell 20 can be determined.

[0054] In this context, tracer gas refers to a gas that can be used for detection. Due to its unique mass properties, it can be more easily detected and tracked, thereby providing accuracy in the detection results.

[0055] Furthermore, a preset value for the tracer gas concentration can be set according to the volume of the containment cavity 11 and other conditions. When the concentration of the tracer gas in the containment cavity 11 is lower than the preset value, it indicates that the content of the tracer gas in the containment cavity 11 is low. At this time, the battery device 100 is in a relatively safe and stable state.

[0056] When the concentration of the tracer gas in the containment cavity 11 reaches or exceeds the preset value, it indicates that the content of the tracer gas in the containment cavity 11 is high, which is very likely caused by leakage of the solid-state battery cell 20. At this time, the battery device 100 is in a state with low safety and poor stability.

[0057] Furthermore, the force-applying component 40 refers to a component capable of applying a certain pressure to the solid-state battery cell 20. The force-applying component 40 is movably disposed relative to the housing 10, and has a first position and a second position during movement. In the first position, the force-applying component 40 presses against the solid-state battery cell 20 to provide a pre-tightening force to the solid-state battery cell 20. Under the action of this pre-tightening force, the positive and negative electrode plates and the electrolyte layer 24 in the solid-state battery cell 20 are tightly bonded, enabling the solid-state battery cell 20 to be used more stably in cycles.

[0058] In the second position, the force-applying component 40 separates from the solid-state battery cell 20, that is, the pre-tightening force on the solid-state battery cell 20 disappears, and the solid contact interface between the positive and negative electrode plates and the electrolyte layer 24 is destroyed, so that the battery device 100 can stop charging and discharging in time.

[0059] The control component refers to the part that can promptly receive the prompt signal issued by the detection component 30 and promptly control the force application component 40 to switch from the first position to the second position. In this way, the battery device 100 can promptly stop charging and discharging when the solid-state battery cell 20 leaks, effectively improving the performance of the battery device 100.

[0060] The control component is communicatively connected to the force application component 40. When the concentration of the tracer gas in the containment cavity 11 reaches or exceeds a preset value, the control component can quickly control the force application component 40 to switch to the second position, so that the force application component 40 is separated from the solid-state battery cell 20, and the battery device 100 stops charging and discharging in time.

[0061] With the above structure, on the one hand, when the battery device 100 is working normally, the force-applying component 40 is in the first position, which can apply a pre-tightening force to the solid-state battery cell 20. Under the action of the pre-tightening force, the positive and negative electrode plates and the electrolyte layer 24 in the solid-state battery cell 20 are tightly bonded, so that the solid-state battery cell 20 can be used more stably in cycles. On the other hand, when a leak occurs, the control component can promptly control the force-applying component 40 to switch to the second position, cancel the pre-tightening force on the solid-state battery cell 20, and separate the solid-solid contact interface between the electrode plates and the electrolyte layer 24 in the solid-state battery cell 20. This allows the battery device 100 to stop charging and discharging in time, thereby improving the safety performance of the solid-state battery in the event of a leak.

[0062] In some embodiments, the solid-state battery cell 20 includes a plurality of cells arranged along their own thickness direction, and the force-applying component 40 is movably disposed on the housing 10 along the arrangement direction a of the solid-state battery cells 20. In a first position, the force-applying component 40 presses against the solid-state battery cell 20 along the arrangement direction a.

[0063] Specifically, a plurality of solid-state battery cells 20 are typically included, and all solid-state battery cells 20 are disposed within the receiving cavity 11. The solid-state battery cell 20 is typically configured as a rectangular structure, wherein each solid-state battery cell 20 includes two large surfaces arranged opposite each other, that is, the surface with the largest area among all surfaces of the solid-state battery cell 20. The thickness direction of the solid-state battery cell 20 is perpendicular to the direction of the large surfaces, and the electrode assembly 22 is stacked inside the housing 21 along the thickness direction; that is, the thickness direction of the solid-state battery cell 20 is also the stacking direction of the positive and negative electrode sheets and the electrolyte layer 24 inside the housing 21.

[0064] Furthermore, each solid-state battery cell 20 is arranged along the thickness direction within the receiving cavity 11, that is, the large surfaces of adjacent solid-state battery cells 20 are fitted together. The force-applying component 40 is movably disposed on the housing 10 along the arrangement direction a of each solid-state battery cell 20, thereby enabling the force-applying component 40 to press against the large surface of the nearest solid-state battery cell 20 along the arrangement direction a.

[0065] When the force-applying component 40 is in the first position, one end of the force-applying component 40 presses against the large surface of the nearest solid-state battery cell 20. In this way, the force-applying component 40 applies a pre-tightening force to all the arranged solid-state battery cells 20 as a whole. Under the action of the pre-tightening force, the solid-state battery cells 20 are more tightly bonded to each other. At the same time, the positive and negative electrode plates and the electrolyte layer 24 in each solid-state battery cell 20 are also more tightly bonded, making the performance of each solid-state battery cell 20 more stable.

[0066] When the force-applying component 40 is in the second position, the force-applying component 40 separates from the nearest solid-state battery cell 20. At this time, the preload on each solid-state battery cell 20 disappears. For each solid-state battery cell 20, the solid-solid contact interface between the positive and negative electrode plates and the electrolyte layer 24 separates, enabling the battery device 100 to stop charging and discharging in time.

[0067] Through the above structure, the force application component 40 can simultaneously provide pre-tightening force to each of the arranged solid-state battery cells 20, making the performance of each solid-state battery cell 20 more stable. At the same time, when the force application component 40 removes the pre-tightening force, the pre-tightening force on all solid-state battery cells 20 disappears, which can separate the solid-solid contact interface between the electrode and the electrolyte layer 24 of each solid-state battery cell 20, allowing the battery device 100 to stop charging and discharging in a timely manner.

[0068] In some embodiments, the force application component 40 includes a cylinder 41 communicatively connected to a control component. The cylinder 41 is movably disposed on the housing 10 along an arrangement direction a and is configured to be switchable between a first position and a second position under the control of the control component.

[0069] Specifically, cylinder 41 is mounted on housing 10 and is capable of moving along the arrangement direction a. The control component can control cylinder 41 to switch from a first position to a second position, and can also control cylinder 41 to return from the second position to the first position.

[0070] When the control component receives a prompt signal from the detection component 30, the control component controls the cylinder 41 to switch from the first position to the second position, so that the battery device 100 stops charging and discharging. If the battery device 100 is inspected and replaced and the leakage is eliminated, the control component can also return the cylinder 41 from the second position to the first position to apply a preload to each solid-state battery cell 20.

[0071] The preload applied by cylinder 41 to the solid-state battery cell 20 can be set to a range of 2 MPa to 200 MPa. When the tracer gas in the accommodating cavity 11 is detected to exceed the standard, the control component controls cylinder 41 to switch from the first position to the second position. At this time, the preload applied by cylinder 41 to the solid-state battery cell 20 gradually disappears, and the rate of pressure reduction of the preload is 0.1 MPa / min to 50 MPa / min, until the battery device 100 stops charging and discharging.

[0072] By setting cylinder 41, it is possible to better move and switch between the first position and the second position, and to better press against or separate from each solid-state battery cell 20, so as to react in time when the solid-state battery cell 20 leaks and control the battery device 100 to stop charging and discharging.

[0073] In some embodiments, the cylinder 41 is disposed along the arrangement direction a on the wall of the housing 10, and has a first end located inside the receiving cavity 11 and a second end located outside the receiving cavity 11. The first end is disposed corresponding to the center position of the large surface of the solid-state battery cell 20.

[0074] Specifically, the first end of the cylinder 41 located inside the receiving cavity 11 is used to press against or separate from the solid-state battery cell 20, and the second end of the cylinder 41 located outside the receiving cavity 11 can serve as an operating end to control the movement of the cylinder 41 for easy operation.

[0075] Specifically, the first end of the cylinder 41 is positioned to correspond to the center of the large surface of the solid-state battery cell 20. When the cylinder 41 is in the first position, the first end presses against the center of the large surface of the solid-state battery cell 20, which can make the preload force more uniform.

[0076] The above structure enables the preload force on the solid-state battery cell 20 to be more uniform, thereby improving stress stability.

[0077] In some embodiments, the battery device 100 further includes a detection component 30 disposed on the housing 10, the detection component 30 being communicatively connected to the control component, and used to detect the concentration of tracer gas in the containment cavity 11. The detection component 30 is configured to transmit a prompt signal to the control component when the concentration of tracer gas in the containment cavity 11 reaches a preset value.

[0078] Specifically, the detection component 30 refers to a structure capable of detecting the concentration of tracer gas in the containment cavity 11. The detection component 30 is disposed on the housing 10, specifically in the containment cavity 11, so as to better detect the concentration of tracer gas in the containment cavity 11.

[0079] When the concentration of tracer gas in the containment chamber 11 reaches or exceeds the preset value, the detection component 30 can promptly send a prompt signal to the control component, enabling the control component to react more quickly, control the force application component 40 to switch from the first position to the second position, and control the battery device 100 to stop charging and discharging.

[0080] The control component is communicatively connected to the detection component 30 and the force application component 40. The control component can receive the prompt signal issued by the detection component 30, and then control the force application component 40 to switch to the first position or the second position in a timely manner according to the prompt signal, so as to realize flexible control of the force application component 40.

[0081] Therefore, by setting up the detection component 30, the concentration and changes of the tracer gas in the containment cavity 11 can be detected in a timely manner, so as to more accurately monitor the leakage of the battery device 100 and improve the detection and control accuracy.

[0082] In some embodiments, a pressure relief port 12 communicating with the receiving cavity 11 is provided on the wall of the housing 10, and the detection component 30 is disposed at the pressure relief port 12.

[0083] Specifically, a pressure relief port 12 is provided on the wall of the housing 10, and the pressure relief port 12 is connected to the receiving cavity 11. When the internal pressure of the housing 10 is too high, the pressure can be released through the pressure relief port 12 to maintain the stability of the internal air pressure of the housing 10.

[0084] By placing the detection component 30 at the pressure relief port 12, the concentration of the tracer gas in the containment cavity 11 can be better detected, thus improving the detection accuracy.

[0085] In some embodiments, the detection component 30 includes a mass spectrometer leak detector and a gas sensor.

[0086] Specifically, the detection component 30 can be configured as a mass spectrometer leak detector or a gas sensor. When the tracer gas is detected by the mass spectrometer leak detector, the specification is 1E-06Pa m3 / s. That is, when the detection leak rate is ≥1E-06Pa m3 / s, it indicates that there is a leak in the solid-state battery cell 20.

[0087] When the tracer gas is detected by a gas sensor, the specification is 200PPB. That is, when the detected value is ≥200PPB, it indicates that there is a leak in the solid-state battery cell 20.

[0088] The above structure enables more accurate detection of the concentration of tracer gas in the containment cavity 11, thereby improving the accuracy of the detection results.

[0089] In some embodiments, the control component includes a battery management system disposed within the receiving cavity 11. The battery management system is communicatively connected to the detection component 30 and the force application component 40, respectively, and is configured to receive a prompt signal and control the force application component 40 to switch between a first position and a second position.

[0090] Specifically, the battery management system (BMS) is located in the housing cavity 11 and is capable of receiving prompt signals from the detection component 30, and controlling the force application component 40 to switch from the first position to the second position, or to control the force application component 40 to return from the second position to the first position according to the signal.

[0091] With the above structure, the movement of the force application component 40 can be controlled more promptly and conveniently to control the normal operation of the solid-state battery cell 20 or to stop charging and discharging.

[0092] Please refer to Figures 2, 3, and 4 together. In some embodiments, the solid-state battery cell 20 includes a housing 21 and an electrode assembly 22 disposed inside the housing 21. The electrode assembly 22 includes a first electrode 23, an electrolyte layer 24, and a second electrode 25 stacked together. The electrolyte layer 24 has a first surface and a second surface disposed opposite to each other. The first surface is fixedly connected to one side surface of the first electrode 23. When the force-applying component 40 is in the first position, the second surface is in contact with the second electrode 25. When the force-applying component 40 is in the second position, the second surface is separated from the second electrode 25.

[0093] Specifically, the housing 21 refers to a component that provides space for the electrode assembly 22 or other functional components. Placing the electrode assembly 22 inside the housing 21 provides a certain degree of protection for the electrode assembly 22. The electrode assembly 22 includes a first electrode 23, an electrolyte layer 24, and a second electrode 25 stacked sequentially. The first electrode 23 can be either a positive or negative electrode. When the first electrode 23 is a positive electrode, the second electrode 25 is a negative electrode. Conversely, when the first electrode 23 is a negative electrode, the second electrode 25 is a positive electrode.

[0094] During the fabrication of the electrode assembly 22, the first surface of the electrolyte layer 24 is fixedly connected to one side surface of the first electrode 23, which can be achieved through coating or other methods. Thus, the electrolyte layer 24 and the first electrode 23 form a whole, and then the second electrode 25 is bonded to the second surface of the electrolyte layer 24 to form a laminated structure.

[0095] Based on this, when the solid-state battery cell 20 is subjected to a pre-tightening force, the first electrode 23, the electrolyte layer 24, and the second electrode 25 are tightly bonded together, enabling more stable charging and discharging. When the pre-tightening force on the solid-state battery cell 20 disappears, the electrolyte layer 24 and the first electrode 23, as a whole, easily separate from the second electrode 25, thereby separating the solid-solid contact interface between the electrolyte layer 24 and the second electrode 25, causing the solid-state battery cell 20 to stop charging and discharging.

[0096] With the above structure, the electrolyte layer 24 and the second electrode 25 can be smoothly bonded or separated under the action of the force application component 40, thereby flexibly controlling the charging and discharging and stopping of charging and discharging of the solid-state battery cell 20.

[0097] In some embodiments, the tracer gas includes one or more of helium, argon, nitrogen, and hydrogen.

[0098] Specifically, the tracer gas can be a mixture of one or more of the above-mentioned gases. For example, when the tracer gas includes helium and nitrogen, the volume percentage of helium can be set to 5% to 95%, with the remainder being the volume percentage of nitrogen.

[0099] In this way, the tracer gas is easier to detect, which can more accurately reflect the leakage of the solid-state battery cell 20 and improve the performance of the battery device 100.

[0100] Based on the same concept as the battery device 100 described above, this application also provides an electrical device including the battery device 100 as described above.

[0101] According to one or more embodiments, in specific use of this application, tracer gas is first injected into the housing 21 during the packaging process of the solid-state battery cell 20. Multiple solid-state battery cells 20 are arranged in the receiving cavity 11. In the initial state, the cylinder 41 is switched to the first position, causing the cylinder 41 to press against the large surface of the solid-state battery cell 20 along the arrangement direction a. This ensures that the solid-solid contact interfaces between the positive and negative electrode plates and the electrolyte layer 24 in each solid-state battery cell 20 are tightly adhered, enabling each solid-state battery cell 20 to charge and discharge more stably.

[0102] When one or more solid-state battery cells 20 in the battery device 100 leak, the detection component 30 detects that the concentration of tracer gas in the containment cavity 11 reaches or exceeds a preset value, and then the detection component 30 issues an alert signal and transmits it to the control component.

[0103] After receiving the prompt signal, the control component quickly controls the cylinder 41 to switch from the first position to the second position. At this time, the cylinder 41 separates from the solid-state battery cell 20, the preload on the solid-state battery cell 20 disappears, and the solid-solid contact interface between the positive and negative electrode plates and the electrolyte layer 24 is destroyed, causing the battery device 100 to stop charging and discharging.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery device, comprising: The box-shaped enclosure has a receiving cavity; A solid-state battery cell is disposed in the receiving cavity, and the interior of the solid-state battery cell is filled with tracer gas; The force-applying component is movably disposed on the housing and has a first position that presses against the solid-state battery cell and a second position that is separated from the solid-state battery cell; and A control component is disposed on the housing and is communicatively connected to the force application component. The control component is configured to control the force application component to switch from the first position to the second position when the tracer gas concentration in the containment cavity reaches a preset value, so as to stop the battery device from charging and discharging.

2. The battery device according to claim 1, wherein, The solid-state battery cell includes multiple solid-state battery cells, each of which is arranged along its own thickness direction. The force-applying component is movably disposed on the housing along the arrangement direction of each solid-state battery cell. At the first position, the force-applying component presses against the solid-state battery cell along the arrangement direction.

3. The battery device according to claim 2, wherein, The force-applying component includes a cylinder that is communicatively connected to the control component. The cylinder is movably disposed on the housing along the arrangement direction and configured to be switchable between the first position and the second position under the control of the control component.

4. The battery device according to claim 3, wherein, The cylinder is disposed on the wall of the housing along the arrangement direction, and has a first end located inside the receiving cavity and a second end located outside the receiving cavity; The first end is positioned corresponding to the center of the large surface of the solid-state battery cell.

5. The battery device according to any one of claims 1-4, wherein, The battery device also includes a detection component disposed on the housing, the detection component being communicatively connected to the control component and used to detect the concentration of tracer gas in the containment cavity; The detection component is configured to transmit a prompt signal to the control component when the concentration of tracer gas in the containment cavity reaches a preset value.

6. The battery device according to claim 5, wherein, A pressure relief port communicating with the receiving cavity is opened on the wall of the box body, and the detection component is disposed at the pressure relief port.

7. The battery device according to claim 5 or 6, wherein, The control component includes a battery management system disposed within the receiving cavity. The battery management system is communicatively connected to the detection component and the force application component, and is configured to receive the prompt signal and control the force application component to switch between the first position and the second position.

8. The battery device according to any one of claims 1-7, wherein, The solid-state battery cell includes a housing and an electrode assembly disposed inside the housing. The electrode assembly includes a first electrode, an electrolyte layer and a second electrode stacked together. The electrolyte layer has a first surface and a second surface disposed opposite to each other. The first surface is fixedly connected to one side surface of the first electrode. When the force-applying component is in the first position, the second surface is in contact with the second electrode. When the force-applying component is in the second position, the second surface is separated from the second electrode.

9. The battery device according to any one of claims 1-8, wherein, The tracer gas includes one or more of helium, argon, nitrogen, and hydrogen.

10. An electrical device comprising a battery device as described in any one of claims 1-9.

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