Solid-state battery module, battery pack and electric equipment

Abstract

The utility model provides a solid-state battery module, a battery pack and electric equipment, and relates to the technical field of batteries, the solid-state battery module comprises: a shell, in which an accommodating cavity is formed; the solid-state battery unit is positioned in the accommodating cavity; the pre-tightening device is positioned between the cavity wall of the accommodating cavity and the solid-state battery unit and is connected with the solid-state battery unit, and the pre-tightening device is configured to adjust extrusion force applied to the surface of the solid-state battery unit through deformation; the non-return device is connected with the cavity wall of the containing cavity, the non-return device is further connected with the pre-tightening device and / or the solid-state battery unit, and the non-return device is configured to enable the end, making contact with the solid-state battery unit, of the pre-tightening device to move towards the solid-state battery unit in a one-way mode, so that stable restraining pressure can be applied to the solid-state battery unit all the time; and good interface contact of the solid-state battery unit is kept.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a solid-state battery module, battery pack and electrical equipment. Background Technology

[0002] Solid-state battery modules are systems composed of multiple solid-state battery cells, designed to provide higher voltage and capacity to meet various application requirements. The solid-state battery cells in a solid-state battery module require a certain pressure to maintain good interfacial contact; therefore, solid-state battery modules typically include a pressure-applying structure specifically designed to apply and maintain this pressure.

[0003] Currently, the commonly used pressure structure is an elastic structure such as a spring or a sheet. The elastic structure squeezes the solid-state battery cell from both ends to keep the solid-state battery cell in interfacial contact.

[0004] However, elastic structures such as springs or sheets can not only stretch and compress solid-state battery cells, but also rebound under the push of solid-state battery cells. This makes it impossible to apply a stable compressive force to solid-state battery cells, affecting the performance of solid-state battery cells. Utility Model Content

[0005] This application provides a solid-state battery module, battery pack, and electrical device to solve the problem that current pressurization structures cannot apply stable pressure to solid-state battery cells.

[0006] In a first aspect, embodiments of this application provide a solid-state battery module, including:

[0007] A housing, the interior of which forms a receiving cavity;

[0008] Solid-state battery cells are located within the receiving cavity;

[0009] A pre-tightening device is located between the cavity wall of the receiving cavity and the solid-state battery cell, and is connected to the solid-state battery cell. The pre-tightening device is configured to adjust the compressive force applied to the surface of the solid-state battery cell by deformation.

[0010] A check device is provided, which is connected to the cavity wall of the receiving cavity and is also connected to the pre-tightening device and / or the solid-state battery cell. The check device is configured such that one end of the pre-tightening device that contacts the solid-state battery cell moves unidirectionally toward the solid-state battery cell.

[0011] In some embodiments of this application, the check valve includes:

[0012] A sliding assembly is slidably disposed within the receiving cavity and connected to the pre-tightening device and / or the solid-state battery cell;

[0013] An anti-rebound assembly includes a stop and a transmission member. The stop is connected to the cavity wall of the receiving cavity, and the transmission member is connected to the sliding assembly. The stop is configured to abut against the transmission member when the sliding assembly moves in a direction away from the solid-state battery cell, thereby stopping the sliding assembly from moving.

[0014] In some embodiments of this application, the stop is a pawl, which is pivotally connected to the cavity wall of the receiving cavity;

[0015] The transmission component includes a plurality of ratchet teeth arranged sequentially along the moving direction of the sliding assembly, the ratchet teeth engaging with the pawl; or, the transmission component includes a ratchet and a connecting rod, the two ends of the connecting rod being rotatably connected to the ratchet and the sliding assembly respectively, the ratchet being rotatably mounted on the cavity wall of the receiving cavity, the ratchet being configured to rotate under the drive of the connecting rod when the sliding assembly moves, and the pawl engaging with the ratchet.

[0016] In some embodiments of this application, the anti-rebound assembly further includes a first bracket, one end of which is connected to the cavity wall of the receiving cavity, and the pawl is pivotally disposed at the end of the first bracket opposite to the cavity wall of the receiving cavity.

[0017] In some embodiments of this application, the sliding component includes:

[0018] A slide rail extends in the same direction as the movement of the end of the pre-tightening device and the solid-state battery cell that is in contact with it, and the slide rail is connected to the pre-tightening device and / or the solid-state battery cell.

[0019] In some embodiments of this application, the check valve further includes a guide member, which is connected to the cavity wall of the receiving cavity or the end of the pre-tightening device away from the solid-state battery cell. The guide member is provided with a guide hole, and the slide rail slides through the guide hole.

[0020] In some embodiments of this application, the cavity wall of the receiving cavity is provided with a connecting hole, and the slide rail extends at least partially through the connecting hole to the outside of the receiving cavity, and the slide rail is slidably and sealingly connected with the connecting hole.

[0021] In some embodiments of this application, a front end plate is provided at the end of the slide rail adjacent to the solid-state battery cell, and the front end plate is connected to the pre-tightening device and the solid-state battery cell.

[0022] In some embodiments of this application, the pretensioning device is a spring or a spring sheet.

[0023] In some embodiments of this application, the solid-state battery cell includes a plurality of stacked cells, and at least one end of the solid-state battery cell in the stacking direction of the cells is provided with the pre-tightening device and the check device between it and the cavity wall of the receiving cavity.

[0024] Secondly, embodiments of this application provide a battery pack including the solid-state battery module described in any one of the first aspects.

[0025] Thirdly, embodiments of this application provide an electrical device, including a device body and a solid-state battery module as described in any of the first aspects or a battery pack as described in the second aspect, wherein the solid-state battery module is used to supply power to the device body.

[0026] In the solid-state battery module, battery pack, and electrical equipment provided in this application, the solid-state battery module has a pre-tightening device, a check device, and a solid-state battery cell arranged in the housing cavity. The pre-tightening device and the check device are located between the solid-state battery cell and the cavity wall. The pre-tightening device is in contact with the surface of the solid-state battery cell and can automatically adjust the compressive force applied to the surface of the solid-state battery cell through deformation, so that the solid-state battery cell can receive appropriate restraint pressure. The check device can restrict the movement direction of the end of the pre-tightening device connected to the solid-state battery cell, so that it can only move in the direction of the solid-state battery cell and cannot move in the opposite direction. This prevents the pre-tightening device from generating reverse deformation, so that the compressive force applied by the pre-tightening device to the surface of the solid-state battery cell will only increase and not decrease. This can offset the phenomenon of thinning of the solid-state battery cell caused by the creep of the electrode material of the solid-state battery cell, so that the solid-state battery cell can always maintain good interface contact and improve the cycle performance of the solid-state battery cell. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] Figure 1 This is a schematic diagram of the structure of an existing solid-state battery module;

[0029] Figure 2 This is a schematic diagram of a first structure of a solid-state battery module provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of a second structure of a solid-state battery module provided in an embodiment of this application;

[0031] Figure 4A schematic diagram of the initial state structure of the pre-tightening device and the anti-return device in the solid-state battery module provided in the embodiments of this application;

[0032] Figure 5 A schematic diagram of the final state structure of the pre-tightening device and the anti-return device in the solid-state battery module provided in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of the slide rail structure in the solid-state battery module provided in the embodiments of this application;

[0034] Figure 7 A schematic diagram of the connection structure between the guide and the slide rail in a solid-state battery module provided in an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the front-end board in the solid-state battery module provided in the embodiments of this application;

[0036] Figure 9 This is a schematic diagram illustrating the changing states of the pre-tightening device in the solid-state battery module provided in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100-Housing, 110-Receiving cavity, 120-Crossbeam, 200-Solid-state battery cell, 210-Battery cell, 300-Pre-tightening device, 400-Check device, 410-Sliding assembly, 411-Slide rail, 412-Front end plate, 420-Anti-rebound assembly, 421-Ratchet, 422-Pawl, 423-First bracket, 430-Guide, 500-Battery pack total positive, 600-Battery pack total negative.

[0039] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0040] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] Solid-state battery modules use solid electrolytes instead of liquid electrolytes in traditional lithium-ion batteries to improve battery energy density, safety, and lifespan.

[0042] like Figure 1 As shown, a solid-state battery module generally includes a housing 100. The housing 100 is divided into multiple receiving cavities 110 by a crossbeam 120. One or more solid-state battery cells 200 are disposed inside the receiving cavities 110. The solid-state battery cells 200 are connected to the load through multiple battery pack positive 500 and battery pack negative 600.

[0043] Among them, the solid-state battery cell 200 is the basic unit of the solid-state battery module. The interfacial contact between the electrode and the solid electrolyte in the solid-state battery cell 200 is crucial for ion conduction. Applying appropriate pressure can improve the physical contact of these interfaces, reduce the interfacial resistance, and improve the ion conduction efficiency, thereby improving the overall performance and energy density of the battery.

[0044] During long-term cycling, the positive and negative electrode materials undergo creep due to the immense pressure they are subjected to, causing the thickness of the solid-state battery cell 200 to gradually decrease. Since the outer frame of the solid-state battery module is fixed, this results in larger gaps inside the solid-state battery cell 200 and a gradual decrease in the restraint pressure, leading to poorer interface contact and affecting battery performance.

[0045] Therefore, a dedicated pressure-applying structure is currently added between the solid-state battery cell 200 and the housing 100 to apply restraint pressure to the solid-state battery cell. The common approach is to add a pressure-applying structure composed of elastic structures such as springs or sheet springs between the solid-state battery cell 200 and the housing 100. By deforming the springs or sheet springs, restraint pressure is applied to the solid-state battery cell 200 as its thickness decreases.

[0046] However, the pressure structure composed of springs or sheet metal is unstable during use. In some cases, it may rebound, causing fluctuations in the restraint pressure applied to the surface of the solid-state battery cell 200. That is, it is unavoidable that there may be gaps in the rebound during the charging and discharging process or during movement of the battery, which will adversely affect the performance of the solid-state battery cell 200.

[0047] To avoid the aforementioned problems, this application provides a solid-state battery module. A pre-tightening device and a check valve are installed between the solid-state battery cell and the cavity wall of the housing. When the internal pressure of the solid-state battery cell decreases and the internal gap shrinks, the pre-tightening device springs back, maintaining strong interfacial contact within the solid-state battery cell. The check valve ensures that the end of the pre-tightening device in contact with the solid-state battery cell can only move in one direction, preventing reverse deformation. Therefore, the force applied to the large surface of the solid-state battery cell increases over time, preventing springback. This ensures that the restraining force applied to the solid-state battery cell only increases, never decreases, thus offsetting the thinning of the battery due to creep of the electrode material. Therefore, it maintains good interfacial contact between the positive and negative electrodes of the solid-state battery cell, providing good restraining pressure and enabling the solid-state battery cell to maintain good cycle performance during long-term cycling.

[0048] It is understood that the solid-state battery module in this application embodiment can be applied to various electrical devices, including but not limited to electric vehicles, consumer electronics, medical devices, drones, industrial equipment, energy storage systems, and other devices that require battery modules for power supply.

[0049] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0050] For some embodiments of this application, please refer to Figure 2 and Figure 3 As shown, the solid-state battery module includes a housing 100, a solid-state battery cell 200, a pre-tightening device 300, and a check device 400.

[0051] The housing 100 generally includes a base plate, a crossbeam 120, and side beams. These structures are assembled to form a receiving cavity 110 for accommodating the battery. The solid-state battery cell 200 is located inside the receiving cavity 110. The crossbeam 120 is generally located on the outer side of the two large surfaces of the solid-state battery cell 200. In order to fix the solid-state battery cell 200, end plates are generally provided in the receiving cavity 110 at positions corresponding to the two large surfaces of the solid-state battery cell 200. The pre-tightening device 300 and the check device 400 are located between the end plates and the large surfaces of the solid-state battery cell 200. Of course, when there are no end plates, the pre-tightening device 300 and the check device 400 can also be directly located between the solid-state battery cell 200 and the crossbeam 120.

[0052] It is understood that some solid-state battery modules may have multiple solid-state battery cells 200. In this case, a crossbeam 120 is usually added to form multiple receiving cavities 110 inside the housing 100. Each receiving cavity 110 is provided with one or more solid-state battery cells 200. Therefore, the receiving cavity 110 referred to in this embodiment can be the only cavity inside the entire housing 100, or it can be one of multiple cavities inside the housing 100. This embodiment does not limit it.

[0053] The solid-state battery cell 200 can be composed of one or more cells 210. When it is composed of multiple cells 210, the multiple cells 210 are stacked in one direction. Adjacent cells 210 are connected in series or in parallel. Finally, it is connected to the load through the battery pack positive 500 and battery pack negative 600.

[0054] The large surfaces of the battery cell 210 are generally located at both ends of its stacking direction. Therefore, the pre-tightening device 300 and the check device 400 can be connected to the large surfaces of the outermost battery cell 210.

[0055] It is understandable that the preload device 300 and the check device 400 can also be used to contact other surfaces of the solid-state battery cell 200 to restrict the position of the solid-state battery cell 200, and not only to contact the large surface to provide restraint pressure.

[0056] The pre-tightening device 300 is connected to the solid-state battery cell 200. The pre-tightening device 300 can adjust the extrusion pressure applied to the surface of the solid-state battery cell 200 by deformation, so that the solid-state battery cell 200 can obtain a suitable restraint pressure on the large surface, so that the solid-state battery cell 200 maintains good interface contact.

[0057] The check device 400 is connected to the cavity wall of the receiving cavity 110. The check device 400 is also connected to at least one of the pre-tightening device 300 and the solid-state battery cell 200. During use, the check device 400 prevents the pre-tightening device 300 from rebounding away from the solid-state battery cell 200, thus ensuring that the pre-tightening device 300 is always pressed against the surface of the solid-state battery cell 200.

[0058] When the internal pressure of the solid-state battery cell 200 decreases and the internal gap shrinks, the pre-tightening device 300 springs back, maintaining strong interfacial contact within the solid-state battery cell 200. Furthermore, the check device 400 can only move in one direction, preventing reverse deformation of the pre-tightening device 300. Therefore, the force applied to the large surface of the solid-state battery cell 200 increases continuously, preventing springback. This ensures that the restraining force applied to the solid-state battery cell 200 only increases, never decreases, thus offsetting the thinning of the battery due to creep of the electrode material. Therefore, it maintains good interfacial contact between the positive and negative electrodes of the solid-state battery cell 200, providing sufficient restraining pressure and enabling the solid-state battery cell 200 to maintain good cycle performance during long-term cycling.

[0059] For some embodiments of this application, please refer to Figure 2 As shown, the pre-tightening device 300 is a spring or a spring sheet. The two ends of the pre-tightening device 300 are in contact with the solid-state battery cell 200 and the cavity wall of the receiving cavity 110, respectively. Of course, it is best to fix it to at least one of the solid-state battery cell 200 and the cavity wall of the receiving cavity 110 by means of adhesive or bolt connection, so as to limit the position of the pre-tightening device 300 in the receiving cavity 110 and keep it in contact with the corresponding position of the solid-state battery cell 200 at all times.

[0060] The pre-tightening device 300 can be one or more springs or spring sheets with the same extension direction, or a combination of springs or spring sheets. As long as it automatically rebounds when the thickness of the solid-state battery unit 200 becomes thinner, it can apply restraining pressure to the solid-state battery unit 200 through deformation stabilization.

[0061] To ensure that the pre-tightening device 300 can always provide sufficient restraint pressure to the solid-state battery cell 200, such as Figure 9 As shown, the spring or sheet can be initially compressed, for example, with a compression rate of 30-70%, to maintain a high pressure, and then gradually relax as the thickness of the solid-state battery cell 200 decreases.

[0062] It is understood that the pre-tightening device 300 can also be any other device that can automatically adjust the pressure through deformation to maintain a stable restraint pressure applied to the surface of the solid-state battery cell 200. This embodiment does not limit it.

[0063] In some embodiments of this application, the anti-return device 400 may be partially driven by the solid-state battery cell 200 or the pretensioning device 300 to move unidirectionally toward the solid-state battery cell 200, thereby limiting the movement direction of the pretensioning device 300 at the end in contact with the solid-state battery cell 200.

[0064] Specifically, please see Figure 4 and Figure 5 As shown, the anti-rebound device 400 includes a sliding assembly 410 and an anti-rebound assembly 420.

[0065] The sliding assembly 410 is slidably disposed within the receiving cavity 110 and connected to at least one of the pre-tightening device 300 and the solid-state battery unit 200. The anti-rebound assembly 420 includes a stop and a transmission member. The stop is connected to the cavity wall of the receiving cavity 110, and the transmission member is connected to the sliding assembly 410. When the sliding assembly 410 moves away from the solid-state battery unit 200, the stop can abut against the transmission member to stop the sliding assembly 410 from moving. When the sliding assembly 410 moves toward the solid-state battery unit 200, the stop does not restrict the movement of the transmission member, so that the sliding assembly 410 can only move toward the direction of compressing the solid-state battery unit 200.

[0066] During use, the pre-tightening device 300 applies pressure through elastic deformation, which is unstable; it can compress and rebound, making it impossible to guarantee against intermittent rebound during the charging, discharging, or movement of the solid-state battery cell 200. The sliding component 410 and the anti-rebound component 420 work together to prevent intermittent rebound of the pre-tightening device 300. Specifically, the initial state of the anti-rebound device 400 is as follows: Figure 4 As shown, as the thickness of the solid-state battery cell 200 gradually decreases, the pre-tightening device 300 gradually relaxes from its most compressed state, causing the sliding component 410 to move towards the solid-state battery cell 200, compressing the space within the solid-state battery cell 200 and providing strong pressure to ensure good interface contact of the solid electrolyte inside the battery, ultimately achieving the desired effect. Figure 5 The final state shown is as follows. However, if the pretensioning device 300 moves in the opposite direction, that is, if it tends to repeatedly move towards the compression state, it will push the transmission component connected to the sliding component 410 to abut against the stop component. Through the cooperation of the stop component and the transmission component, the sliding component 410 cannot move in the direction away from the solid-state battery cell 200, thereby preventing the pretensioning device 300 from deforming in the opposite direction, so as to continuously provide stable restraint pressure for the solid-state battery cell 200 and ensure the performance of the solid-state battery cell 200.

[0067] In some embodiments of this application, such as Figure 6 As shown, the sliding assembly 410 includes a slide rail 411, which extends along the length of the spring or spring sheet and is slidably disposed within the receiving cavity 110. The slide rail 411 is connected to at least one of the pre-tightening device 300 and the solid-state battery cell 200 so that when the pre-tightening device 300 deforms, the slide rail 411 can move synchronously with the end of the pre-tightening device 300 that is in contact with the solid-state battery cell 200 towards the solid-state battery cell 200 to compress the solid-state battery cell 200.

[0068] The direction of movement of the slide rail 411 relative to the receiving cavity 110 should be consistent with the extension direction of the spring or spring sheet. Therefore, corresponding components can be added to restrict the direction of movement of the slide rail 411.

[0069] For example, please see Figure 7 As shown, the check device 400 also includes a guide member 430. The guide member 430 is connected to the cavity wall of the receiving cavity 110 or the end of the pre-tightening device 300 away from the solid-state battery unit 200. The guide member 430 is provided with a guide hole, and the slide rail 411 slides through the guide hole. The shape of the slide rail 411 is adapted to the guide hole. The movement direction of the slide rail 411 can be effectively restricted through the guide hole to prevent the slide rail 411 from deflecting.

[0070] For example, a guide groove and a slider can also be provided between the slide rail 411 and the bottom or side wall of the receiving cavity 110. For example, the guide groove is provided at the bottom of the receiving cavity 110 and extends along the moving direction of the slide rail 411, while the slider is fixed on the slide rail 411. The slider slides in cooperation with the guide groove, and the moving direction of the slide rail 411 can be restricted by the slider and the guide groove.

[0071] It is understandable that the slide rail 411 can also be replaced by other common structures, such as rigid rods or plates, as long as they can effectively prevent the pretensioning device 300 from moving away from the solid-state battery cell 200. This embodiment does not limit it.

[0072] Since the slide rail 411 needs to move along with the pre-tightening device 300 when it is relaxed, the slide rail 411 needs to have a certain length. If the length between the solid-state battery unit 200 and the cavity wall of the receiving cavity 110 is sufficient, the slide rail 411 can be located entirely within the receiving cavity 110.

[0073] If the initial distance between the solid-state battery cell 200 and the cavity wall of the receiving cavity 110 is insufficient to accommodate the slide rail 411, a connection hole can be provided on the cavity wall of the receiving cavity 110. The slide rail 411 extends at least partially through the connection hole to the outside of the receiving cavity 110, and it is preferable that the slide rail 411 and the connection hole are slidably sealed together to prevent harmful substances in the external environment from entering the receiving cavity 110 through the connection hole, or to prevent interference between solid-state battery cell 200 modules in adjacent receiving cavities 110 when there are multiple receiving cavities 110 in the housing 100.

[0074] Further, please see Figure 8 As shown, a front end plate 412 can also be provided at the end of the slide rail 411 adjacent to the solid-state battery unit 200, and the front end plate 412 is connected to the pre-tightening device 300 and the solid-state battery unit 200.

[0075] Specifically, the front end plate 412 can be fixedly connected to the large surface of the solid-state battery unit 200 by means of adhesive or bolt connection. It can also be connected to one end of the solid-state battery unit 200 by the pre-tightening device 300 by means of adhesive or bolt connection, so as to better restrict the movement direction of the pre-tightening device 300 and the end connected to the solid-state battery unit 200. At the same time, by changing the shape of the front end plate 412, the contact surface between the slide rail 411 and the solid-state battery unit 200 can be changed to facilitate connection.

[0076] It is understood that the front end plate 412 can be connected to the slide rail 411 by means of bolts or welding, or it can be integrally formed. This embodiment does not limit this.

[0077] For example, in order to effectively improve the linkage effect between the slide rail 411 and the pretensioning device 300, one end of the pretensioning device 300 can be connected to the front end plate 412 and the other end can be connected to the guide member 430.

[0078] In some embodiments of this application, the stop is a pawl 422, which is pivotally connected to the cavity wall of the receiving cavity 110. The transmission component includes a plurality of ratchet teeth 421 arranged sequentially along the moving direction of the sliding assembly 410, and the ratchet teeth 421 cooperate with the pawl 422.

[0079] Taking the sliding assembly 410, including the slide rail 411, as an example, multiple ratchet teeth 421 are arranged sequentially along the moving direction of the slide rail 411. The ratchet teeth 421 can be arranged on the side or top of the slide rail 411, depending on the arrangement environment. The pawl 422 cooperates with the ratchet teeth 421. When the slide rail 411 moves towards the solid-state battery unit 200 driven by the pre-tensioning device 300, the pawl 422 will bounce along the inclined surface of the ratchet teeth 421, without obstructing the movement of the ratchet teeth 421. However, if the ratchet teeth 421 move in the opposite direction, that is, in the direction away from the solid-state battery unit 200, the pawl 422 will abut against the ratchet teeth 421, preventing the ratchet teeth 421 from moving smoothly. This allows the slide rail 411 to move only unidirectionally towards the solid-state battery unit 200 and restricts the moving direction of the pre-tensioning device 300.

[0080] In some embodiments of this application, the stop is a pawl 422, which is pivotally connected to the cavity wall of the receiving cavity 110. The transmission component includes a ratchet and a connecting rod. The two ends of the connecting rod are rotatably connected to the ratchet and the sliding assembly 410, respectively. The ratchet is rotatably mounted on the cavity wall of the receiving cavity 110, and the pawl 422 cooperates with the ratchet.

[0081] Taking the sliding assembly 410, which includes the slide rail 411, as an example, the two ends of the connecting rod are rotatably connected to the ratchet and the slide rail 411, respectively. When the slide rail 411 moves, the connecting rod will move and rotate, driving the ratchet to rotate. When the slide rail 411 moves towards the solid-state battery unit 200, the pawl 422 can jump accordingly when the ratchet rotates in the corresponding direction, without affecting the rotation of the ratchet. However, when the slide rail 411 shows a tendency to move away from the solid-state battery unit 200, the ratchet will show a tendency to rotate in the opposite direction. At this time, the pawl 422 will abut against the teeth on the ratchet, preventing the ratchet from rotating in that direction, thus allowing the slide rail 411 to move only in one direction.

[0082] Furthermore, in order to facilitate the installation of the pawl 422, the anti-rebound assembly 420 may also include a first bracket 423, one end of which is connected to the cavity wall of the receiving cavity 110, and the first pawl 422 is pivotally disposed at the end of the first bracket 423 away from the cavity wall of the receiving cavity 110.

[0083] Specifically, the setting direction of the pawl 422 needs to be adapted to the teeth on the ratchet 421 or ratchet. At this time, the first bracket 423 can be used to install the pawl 422 at a suitable angle in a suitable position to ensure stable contact with the ratchet 421 and ratchet.

[0084] like Figure 4 and Figure 5 As shown, in some cases, a second bracket can be added as a transfer point. The second bracket is connected to the cavity wall of the receiving cavity 110 and extends to the corresponding position. Then, by fixing the first bracket 423 to the second bracket, the pawl 422 can be installed at a suitable angle through the first bracket 423.

[0085] In the actual application of the pre-tightening device 300 and the check device 400, the number and location of their installation can be determined according to the actual situation. The following are some examples of common installation methods.

[0086] For example, such as Figure 3 As shown, a pre-tightening device 300 and a check device 400 are provided between a large surface of the solid-state battery cell 200 and the cavity wall of the receiving cavity 110.

[0087] For example, such as Figure 2 As shown, a pre-tightening device 300 is provided between the two large surfaces of the solid-state battery cell 200 and the cavity wall of the receiving cavity 110.

[0088] In both of the above cases, one or more pre-tightening devices 300 and one or more check devices 400 can be provided between one large surface of the solid-state battery cell 200 and the cavity wall of the receiving cavity 110. Examples of some common cases are given below:

[0089] For example, the number of pre-tightening devices 300 and check devices 400 is the same, with each pre-tightening device 300 corresponding to one check device 400. Alternatively, the pre-tightening devices 300 and check devices 400 are each independently connected to the cavity wall of the solid-state battery cell 200 and the receiving cavity 110, and are not connected to each other.

[0090] For example, multiple pre-tightening devices 300 are provided, and the number of check devices 400 is less than the number of pre-tightening devices 300. In this case, the check devices 400 may not be connected to the pre-tightening devices 300, but only to the cavity walls of the solid-state battery cell 200 and the receiving cavity 110. Alternatively, each check device 400 may be connected to any one of the pre-tightening devices 300.

[0091] For example, only one pretensioning device 300 and one check device 400 are provided. In this case, the pretensioning device 300 and the check device 400 may or may not be connected.

[0092] This application also provides a battery pack, including one or more solid-state battery modules as described in the above embodiments. When multiple solid-state battery modules are provided, the solid-state battery modules can be connected in series or in parallel.

[0093] The battery pack also includes components such as a battery management system and a cooling system to ensure the normal operation of the solid-state battery module. These are well known to those skilled in the art, and will not be described in detail here.

[0094] This application also provides an electrical device, including a device body and a solid-state battery module or battery pack as described in the above embodiments, wherein the solid-state battery module is used to supply power to the device body.

[0095] It is understood that electrical equipment includes, but is not limited to, electric vehicles, consumer electronics, medical devices, drones, industrial equipment, energy storage systems, and other devices that require battery modules for power.

[0096] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0097] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A solid-state battery module, characterized in that, include: A housing (100) having an internal cavity (110) formed therein; Solid-state battery cell (200) is located within the receiving cavity (110); A pre-tightening device (300) is located between the cavity wall of the receiving cavity (110) and the solid-state battery cell (200) and is connected to the solid-state battery cell (200). The pre-tightening device (300) is configured to adjust the compressive force applied to the surface of the solid-state battery cell (200) by deformation. A check device (400) is connected to the cavity wall of the receiving cavity (110), and the check device (400) is also connected to the pre-tightening device (300) and / or the solid-state battery cell (200). The check device (400) is configured such that one end of the pre-tightening device (300) that contacts the solid-state battery cell (200) moves unidirectionally toward the solid-state battery cell (200).

2. The solid-state battery module according to claim 1, characterized in that, The check device (400) includes: A sliding assembly (410) is slidably disposed within the receiving cavity (110) and connected to the pre-tightening device (300) and / or the solid-state battery cell (200); An anti-rebound assembly (420) includes a stop and a transmission member. The stop is connected to the cavity wall of the receiving cavity (110), and the transmission member is connected to the sliding assembly (410). The stop is configured to abut against the transmission member when the sliding assembly (410) moves in a direction away from the solid-state battery cell (200), thereby stopping the sliding assembly (410) from moving.

3. The solid-state battery module according to claim 2, characterized in that, The stop is a pawl (422), which is pivotally connected to the cavity wall of the receiving cavity (110); The transmission component includes a plurality of ratchet teeth (421) arranged sequentially along the moving direction of the sliding assembly (410), the ratchet teeth (421) engaging with the pawl (422); or, the transmission component includes a ratchet and a connecting rod, the two ends of the connecting rod being rotatably connected to the ratchet and the sliding assembly (410) respectively, the ratchet being rotatably disposed on the cavity wall of the receiving cavity (110), the ratchet being configured to be driven to rotate by the connecting rod when the sliding assembly (410) moves, and the pawl (422) engaging with the ratchet.

4. The solid-state battery module according to claim 3, characterized in that, The anti-rebound assembly also includes a first bracket (423), one end of which is connected to the cavity wall of the receiving cavity (110), and the pawl (422) is pivotally disposed at the end of the first bracket (423) away from the cavity wall of the receiving cavity (110).

5. The solid-state battery module according to claim 2, characterized in that, The sliding assembly (410) includes: The slide rail (411) extends in the same direction as the movement direction of the end of the pretensioning device (300) and the solid-state battery unit (200) that is in contact with it. The slide rail (411) is connected to the pretensioning device (300) and / or the solid-state battery unit (200).

6. The solid-state battery module according to claim 5, characterized in that, The check valve (400) further includes a guide (430), which is connected to the cavity wall of the receiving cavity (110) or the end of the pre-tightening device (300) away from the solid-state battery cell (200). The guide (430) is provided with a guide hole, and the slide rail (411) slides through the guide hole.

7. The solid-state battery module according to claim 6, characterized in that, The cavity wall of the receiving cavity (110) is provided with a connecting hole, and the slide rail (411) extends at least partially through the connecting hole to the outside of the receiving cavity (110), and the slide rail (411) is slidably and sealingly connected with the connecting hole.

8. The solid-state battery module according to claim 6, characterized in that, The slide rail (411) is provided with a front end plate (412) at one end adjacent to the solid-state battery unit (200), and the front end plate (412) is connected to the pre-tightening device (300) and the solid-state battery unit (200).

9. The solid-state battery module according to any one of claims 1-8, characterized in that, The pre-tensioning device (300) is a spring or a spring sheet.

10. The solid-state battery module according to any one of claims 1-8, characterized in that, The solid-state battery cell (200) includes a plurality of stacked cells (210). At least one end of the solid-state battery cell (200) in the stacking direction of the cells (210) is provided with the pre-tightening device (300) and the check device (400) between it and the cavity wall of the receiving cavity (110).

11. A battery pack, characterized in that, Includes the solid-state battery module according to any one of claims 1-10.

12. An electrical appliance, characterized in that, The device includes a main body and a solid-state battery module as described in any one of claims 1-10 or a battery pack as described in claim 11, wherein the solid-state battery module is used to power the main body of the device.

Images