Solid-state battery assembly, battery pack, and power-using device

Abstract

The application provides a solid-state battery assembly, a battery pack and an electric device, and relates to the technical field of batteries.The solid-state battery assembly comprises a plurality of battery monomers and a cooling structure;each battery monomer comprises a shell and a battery body, the battery body is arranged in the shell, and the shell is provided with an inlet and an outlet; the cooling structure comprises a cooling medium source, a supply pipeline and a return pipeline, the supply pipeline and the return pipeline are respectively communicated with the cooling medium source, the inlet of each shell is communicated with the supply pipeline, and the outlet of each shell is communicated with the return pipeline.The shell of each battery monomer is communicated with the cooling structure, so that the battery body of each battery monomer can be immersed in the cooling medium, thereby each battery monomer of the solid-state battery assembly can be cooled in time and effectively, the temperature rising speed during use of the solid-state battery assembly is prevented from being too fast or the internal and external temperature difference is prevented from being too large, and the overall cooling effect of the solid-state battery is effectively improved.

Description

Technical Field

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

[0002] Solid-state batteries typically consist of multiple individual cells connected in series and parallel to form a module, and then multiple modules are connected in series and parallel to form a battery pack. Because the contact between the solid electrolyte and the electrodes in a solid-state battery cell is point contact, ion transport resistance is high. During high-current charging and discharging, this high impedance generates a large amount of Joule heat, causing the battery to heat up rapidly. Furthermore, since the thermal conductivity of solid-state electrolytes is generally lower than that of liquid electrolytes, heat tends to accumulate inside the battery and is not easily conducted away, resulting in a significant temperature difference between the inside and outside of the solid-state battery during use.

[0003] To reduce the heating rate and internal / external temperature difference of solid-state batteries, the current practice is to install a liquid cooling plate inside the battery pack casing that contacts the module. The liquid cooling plate is filled with a cooling medium and can exchange heat with the module, thereby reducing the internal heat of the solid-state battery. However, the cooling effect of the liquid cooling plate on the solid-state battery is limited. Summary of the Invention

[0004] The purpose of this invention is to provide a solid-state battery component, battery pack, and power device to alleviate the technical problem in the prior art where a liquid cooling plate is provided inside the battery pack housing of a solid-state battery, which abuts against the module and is filled with a cooling medium. The liquid cooling plate is used to exchange heat with the module and reduce the internal heat of the solid-state battery, but the cooling effect of the liquid cooling plate on the solid-state battery is limited.

[0005] In a first aspect, the present invention provides a solid-state battery assembly, comprising multiple individual battery cells and a cooling structure; Each of the battery cells includes a casing and a cell body, the cell body being disposed inside the casing, and each casing having an inlet and an outlet; The cooling structure includes a supply pipe and a return pipe, which are respectively connected to a cooling medium source. The inlet of each of the outer casings is connected to the supply pipe, and the outlet of each of the outer casings is connected to the return pipe.

[0006] In an optional implementation, the system also includes a pump body, a regulating valve, and a control system; The pump body is installed on the pipeline between the supply pipeline and the cooling medium source, and the regulating valve is installed on the pipeline between the return pipeline and the cooling medium source; Each of the battery cells is equipped with a pressure detection device. The pump body, the regulating valve, and the multiple pressure detection devices are all connected to the control system. The control system has a preset pressure threshold. The control system is used to receive the pressure information and pressurization command detected by each of the pressure detection devices, and close the regulating valve and increase the speed of the pump body according to the pressurization command, so that the pressure value at each of the battery cells reaches the pressure threshold.

[0007] In an optional implementation, a plurality of detection components are also included, each of which is connected to a plurality of individual battery cells in a one-to-one correspondence. The detection components are used to detect the operating parameters of the corresponding individual battery cells. The multiple detection components are all connected to the control system. The control system is used to calculate compensation parameters based on the parameter information detected by the multiple detection components and the pressure information detected by the multiple pressure detection devices, and adjust the opening of the regulating valve and the rotation speed of the pump body based on the compensation parameters so that the pressure value at each battery cell is maintained at the pressure threshold.

[0008] In an optional implementation, the control system includes a judgment module, which is used to determine whether a sudden change in pressure occurs based on the pressure information detected by the pressure detection element. The control system is also used to control the regulating valve to open to the maximum opening degree and control the pump body to reach the maximum speed when the judgment result of the judgment module is yes.

[0009] In an optional embodiment, the pipe body of the supply pipeline is provided with a plurality of supply connectors arranged sequentially along its axial direction, and the plurality of supply connectors are connected to the plurality of inlets on the outer shell in a one-to-one correspondence. The reflux pipeline has multiple reflux connectors arranged sequentially along its axial direction, and each of the multiple reflux connectors is connected to an outlet on the multiple outer shell.

[0010] In an optional embodiment, the plurality of battery cells are divided into two groups, the two groups of battery cells are distributed along the width direction of the solid-state battery assembly, and the plurality of battery cells in each group are stacked along the length direction of the solid-state battery assembly. The supply pipeline is located below the position between the two sets of battery cells. The return pipeline includes a return connecting pipe and two return branch pipes. The two return branch pipes are respectively located below the mutually distant sides of the two sets of battery cells, and the two return branch pipes are connected to each other through the return connecting pipe. The return connecting pipe is connected to the cooling medium source.

[0011] In an optional embodiment, the supply pipeline includes a plurality of supply branch pipes connected in sequence, and any two adjacent supply branch pipes in a set are connected by a supply series pipe. The return branch pipe includes multiple return branch pipes connected in sequence, and any two adjacent return branch pipes in a set are connected by a return series pipe.

[0012] In an optional embodiment, the device further includes a housing structure and a pressure plate, wherein the pressure plate, the cooling structure, and the plurality of battery cells are all installed inside the housing structure, and the pressure plate and the cooling structure respectively abut against both sides of the plurality of battery cells.

[0013] In a second aspect, the present invention provides a battery pack comprising a solid-state battery assembly as described in any of the foregoing embodiments.

[0014] Thirdly, the present invention provides an electrical device including the battery pack described in the foregoing embodiments.

[0015] The solid-state battery assembly provided by this invention includes multiple individual battery cells and a cooling structure. Each individual battery cell includes a casing and a cell body, with the cell body disposed within the casing. Each casing has an inlet and an outlet. The cooling structure includes a cooling medium source, a supply pipeline, and a return pipeline. The supply pipeline and the return pipeline are respectively connected to the cooling medium source. The inlet of each casing is connected to the supply pipeline, and the outlet of each casing is connected to the return pipeline. The solid-state battery assembly provided by this invention consists of multiple solid-state battery cells connected in series and parallel to form a battery pack. Multiple individual battery cells are connected in series and parallel to form the aforementioned solid-state battery assembly. The cell body in each individual battery cell is a solid electrolyte, and the casing in the individual battery cell is an inherent structure of the individual battery cell, serving to support and protect the cell body. This invention connects the supply pipe in the cooling structure to the inlet of the outer casing of each individual battery cell, and the return pipe to the outlet of the outer casing of each individual battery cell. This allows each outer casing to be connected to the cooling structure, enabling the cooling medium from the cooling medium source to flow into the interior of each outer casing, thus immersing each battery cell in the cooling medium. When the solid-state battery assembly is in operation, the heat generated at each battery cell can be exchanged and cooled by the surrounding cooling medium in a timely manner. Furthermore, the cooled medium, after heat exchange, can be returned to the cooling medium source through the return pipe in the cooling structure to be cooled again and re-form the cooling medium. This ensures that cooling medium continuously flows into each outer casing, guaranteeing a continuous cooling effect for each battery cell. Therefore, each individual cell can be cooled in a timely manner by the cooling structure, which can effectively prevent the overall temperature rise of the solid-state battery module from being too fast or the temperature difference between the inside and outside from being too large. Compared with the liquid cooling plate in the prior art, the present invention connects the inherent structure of the outer shell in each individual cell with the cooling structure, so that each individual cell can be cooled in a timely and effective manner, which effectively improves the cooling uniformity and cooling effect of the solid-state battery module as a whole.

[0016] Compared with the prior art, the solid-state battery module provided by the present invention connects the outer shell of each cell to the cooling structure, so that the cell body of each cell can be immersed in the cooling medium, thereby enabling timely and effective cooling of each cell in the solid-state battery module. This prevents the solid-state battery module from heating up too quickly or having too large a temperature difference between the inside and outside during use, and thus effectively improves the overall cooling effect of the solid-state battery.

[0017] The battery pack provided by this invention may include the aforementioned solid-state battery components. Multiple solid-state battery components may be connected in series and parallel to form a battery pack. The battery pack provided by this invention can also connect the outer shell of each cell to a cooling structure, so that the cell body of each cell is immersed in the cooling medium, thereby providing timely and effective cooling for each cell of the solid-state battery component, effectively improving the overall cooling effect of the solid-state battery, and thus improving the overall cooling effect of the battery pack.

[0018] The electrical device provided by the present invention includes the above-mentioned battery pack, and therefore the electrical device has the same beneficial effects as the above-mentioned battery pack. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a solid-state battery assembly provided in an embodiment of the present invention; Figure 2 An exploded view of a solid-state battery assembly provided in an embodiment of the present invention; Figure 3 This is a partial structural diagram of the cooling structure provided in an embodiment of the present invention; Figure 4 A cross-sectional view of the supply shunt pipe provided in an embodiment of the present invention; Figure 5 A cross-sectional view of the return flow splitter provided in an embodiment of the present invention; Figure 6 This is a schematic diagram showing the flow direction of the cooling medium within a solid-state battery assembly, as provided in an embodiment of the present invention. Figure 7 A top view of a partial solid-state battery assembly provided in an embodiment of the present invention; Figure 8 This is another structural schematic diagram of a solid-state battery assembly provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of an electrical device including a battery pack, provided for an embodiment of the present invention.

[0021] Icons: 1-Battery cell; 2-Cooling structure; 20-Supply pipeline; 200-Inlet connector; 201-Supply connector; 202-Supply branch pipe; 203-Supply series pipe; 21-Return pipeline; 210-Outlet connector; 211-Return connector; 212-Return connecting pipe; 213-Return branch pipe; 2130-Return branch pipe; 2131-Return series pipe; 22-Series connector; 3-Cooling medium source; 4-Pump body; 5-Regulating valve; 6-Filter; 7-Refrigeration structure; 8-Shell structure; 80-Pressure plate; 81-Structural adhesive; 82-Upper shell; 83-Lower shell; 84-High-voltage and low-voltage unit assembly; 9-Heater; 90-Casing. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] Example: like Figures 1-7 As shown, the solid-state battery assembly provided in this embodiment includes multiple battery cells 1 and a cooling structure 2; each battery cell 1 includes a casing and a cell body, the cell body is disposed inside the casing, and each casing is provided with an inlet and an outlet; the cooling structure 2 includes a cooling medium source 3, a supply pipe 20 and a return pipe 21, the supply pipe 20 and the return pipe 21 are respectively connected to the cooling medium source 3, the inlet of each casing is connected to the supply pipe 20, and the outlet of each casing is connected to the return pipe 21.

[0029] In some implementations, solid-state battery components can be assembled into a battery pack, and the number of solid-state battery components contained in the battery pack can be one or more, the specific number of which can be selected by those skilled in the art according to the application and capacity of the battery pack.

[0030] Multiple individual cells 1 are connected in series and parallel to form the aforementioned solid-state battery assembly. The cell body in each individual cell 1 is a solid electrolyte. Specifically, the cell body can be a pouch solid-state cell. The outer shell in the individual cell 1 is an inherent structure of the individual cell 1, which is used to support and protect the cell body.

[0031] In this embodiment, by connecting the supply pipe 20 in the cooling structure 2 to the inlet of the outer casing of each battery cell 1 and the return pipe 21 to the outlet of the outer casing of each battery cell 1, each outer casing can be connected to the cooling structure 2. Thus, the cooling medium from the cooling medium source 3 can flow into the interior of each outer casing, thereby immersing each battery cell in the cooling medium. The cooling medium source 3 can be a highly insulating and highly thermally conductive oil. When the solid-state battery assembly is in operation, the heat generated at each battery cell can be exchanged and cooled by the surrounding cooling medium. The cooled medium, after heat exchange, can also flow back to the cooling medium source 3 through the return pipe 21 in the cooling structure 2 to be cooled again, thus ensuring a continuous flow of cooling medium into each outer casing to guarantee a continuous cooling effect at each battery cell.

[0032] Therefore, each individual cell 1 can be cooled by the cooling structure 2 in a timely manner, which can effectively prevent the overall temperature rise of the solid-state battery assembly from being too fast or the temperature difference between the inside and outside from being too large. Compared with the existing technology that uses liquid cooling plates for indirect heat conduction (the liquid cooling plate and the battery module usually need to be set with thermal conductive adhesive and module structural components, resulting in indirect heat conduction between the individual cell 1 in the module and the liquid cooling plate), this embodiment connects the inherent structure of the outer shell in each individual cell 1 with the cooling structure 2, so that each individual cell 1 can be immersed in a highly insulating and highly thermally conductive oil. This allows the surface of each individual cell 1 to directly contact the cooling medium for convection heat exchange, eliminating the intermediate thermal interface material and structural components, fundamentally reducing the thermal resistance. While achieving efficient temperature uniformity and heat dissipation, it also simplifies the number of system components and further improves the system's volume assembly rate.

[0033] Compared with the prior art, the solid-state battery assembly provided in this embodiment connects the outer shell of each cell 1 to the cooling structure 2, so that the cell body of each cell 1 can be immersed in the cooling medium. This allows each cell 1 of the solid-state battery assembly to be cooled in a timely and effective manner, preventing the solid-state battery assembly from heating up too quickly or having too large a temperature difference between the inside and outside during use, thereby effectively improving the overall cooling effect of the solid-state battery.

[0034] To facilitate connection between the cooling medium source 3 and the supply pipeline 20, such as Figure 3 As shown, one end of the supply pipe 20 may be equipped with an inlet connector 200, which is connected to the outlet of the cooling medium source 3. To facilitate connection between the cooling medium source 3 and the return pipe 21, as shown... Figure 3 As shown, the return pipe 21 can be connected to the outlet pipe connector 210, which is connected to the return port of the cooling medium source 3.

[0035] For solid-state batteries, during the repeated charge-discharge cycles of lithium-ion insertion and extraction, the active materials of the electrodes undergo significant volume changes, leading to microscale separation and contact failure at the interface (the interface between the positive and negative electrodes and the individual cell 1). This results in a continuous increase in internal resistance and rapid capacity decay. To improve interface stability and battery cycle life, constant external mechanical pressure is typically applied to ensure tight interface contact. Since the contact between solid particles exists as discrete point contacts, and existing solid-state battery pressurization methods are mostly physical pressurization, it is difficult to achieve uniform pressure at all points and surfaces due to limitations in the processing precision of the pressurization structure. Therefore, under external pressure, these limited contact points will bear extremely high local stress, resulting in severely uneven stress distribution. Some areas bear excessive pressure due to stress concentration, while other areas form "dead zones" with poor ion conductivity due to insufficient contact, thus affecting the overall conductivity efficiency.

[0036] To address the problem of severely uneven stress distribution caused by mechanical pressure application in existing technologies, such as Figure 8 As shown, the solid-state battery assembly provided in this embodiment also includes a pump body 4, a regulating valve 5, and a control system. The pump body 4 is disposed on the pipeline between the supply pipeline 20 and the cooling medium source 3, and the regulating valve 5 is disposed on the pipeline between the return pipeline 21 and the cooling medium source 3. Each battery cell 1 is provided with a pressure detection device. The pump body 4, the regulating valve 5, and multiple pressure detection devices are all connected to the control system. The control system is preset with a pressure threshold. The control system is used to receive the pressure information and pressurization command detected by each pressure detection device, and close the regulating valve 5 and increase the speed of the pump body 4 according to the pressurization command so that the pressure value at each battery cell 1 reaches the pressure threshold.

[0037] This embodiment utilizes a control component combined with detection information from a pressure sensor and pressurization commands to increase the rotational speed of the pump body 4. This increases the pressure of the fluid supplied to the casing of each individual battery cell 1 until the surface pressure of each battery cell 1 reaches a pressure threshold. It can be seen that the solid-state battery assembly provided in this embodiment can actively regulate the surface pressure of the battery cell by controlling the flow rate, velocity, and opening state of the regulating valve 5 of the fluid flowing into each casing. Compared to mechanical pressurization, the fluid pressurization method in this embodiment is not only easier to control but also effectively improves the pressure uniformity of the battery cells, thereby effectively suppressing volume expansion and extending battery cycle life.

[0038] To refine the pressurization process, a liquid level sensor can be installed inside the casing of each battery cell 1. The liquid level sensor is connected to the control system. The control system can also preset a liquid level threshold. Based on the pressure information detected by each pressure detection device, the liquid level information detected by each liquid level sensor, and the pressurization command, the control system can close the regulating valve 5 and increase the speed of the pump body 4 so that the pressure value and liquid level value at each battery cell 1 reach the pressure threshold and liquid level threshold, respectively.

[0039] The pump body 4 can be an oil pump, the regulating valve 5 can be a proportional valve, and the pressure detection element can be a pressure sensor, which can be installed on the joint between the supply pipeline 20 and the housing inlet. The control system can be the control system of the electrical device to which the solid-state battery module is applied. For example, when the electrical device is a car, the control system can be the car's PDCU (Power Distribution Control Unit).

[0040] The solid-state battery assembly provided in this embodiment may also include multiple detection components, which are connected one-to-one with multiple individual battery cells 1. The detection components are used to detect the operating parameters of their corresponding individual battery cells 1. All multiple detection components are connected to a control system. The control system is used to calculate compensation parameters based on the parameter information detected by the multiple detection components and the pressure information detected by the multiple pressure detection devices, and adjust the opening of the regulating valve 5 and the rotation speed of the pump body 4 based on the compensation parameters so that the pressure value at each individual battery cell 1 is maintained at the pressure threshold.

[0041] The operating parameters of a single battery cell 1 can be parameters such as voltage, current, and temperature. In this case, the detection component can be the detection system of the electrical device. For example, when the electrical device is a car, the detection component can be the car's BMS (Battery Management System).

[0042] The control component calculates compensation parameters and adjusts the opening of the regulating valve 5 and the rotation speed of the pump body 4 based on the compensation parameters, so that the pressure value at each battery cell 1 can be maintained at the pressure threshold, thereby achieving stable control of fluid flow and pressure.

[0043] When a solid-state battery module includes multiple detection components, its operating modes can be divided into pressurized mode, operating mode, and sleep mode.

[0044] The pressurization mode is the initialization process for the solid-state battery module, which is initiated for the first time after the module is installed on the electrical device and the electrical connection is completed. The pressurization mode consists of the following four execution steps: 1. Vacuuming of the circuit: Vacuuming is performed on the pipes in cooling structure 2 (absolute pressure < 60Pa) to remove residual gas and moisture from the pipes, ensuring the purity and incompressibility of the pressure transmission medium (i.e., the cooling medium), laying the physical foundation for subsequent precise pressure control.

[0045] II. Initial pressure build-up circulation: Start pump body 4 to drive the cooling medium to circulate at low speed in the closed loop between cooling structure 2 and each outer shell, to complete further venting and wetting, and ensure that the cooling medium fills all corners.

[0046] 3. Lock-up and pressurization: Close the regulating valve 5 and switch the pump body 4 to high-pressure mode to continuously supply cooling medium into the outer shell of the battery cell 1 to pressurize the sealed space. During this process, the control system receives the detection data of the liquid level sensor and pressure detection device at each battery cell 1 in real time until the surface contact pressure and liquid level of all battery cell 1 reach the preset target threshold, so as to achieve uniform pressure control from "surface" to "point". After the pressure and liquid level reach the preset target threshold, the control system can lock the pressure and enter the standby state.

[0047] IV. Exit Conditions: After the pressure and liquid level parameters reach the preset target thresholds and stabilize, the system will automatically switch to working mode or hibernation mode.

[0048] In operating mode, the solid-state battery module is in a charging and discharging state. The control system can receive voltage and current signals detected by multiple detection components to determine in real time whether the solid-state battery module is in a normal or abnormal state.

[0049] Based on this, the control system includes a judgment module, which is used to determine whether there is a sudden change in pressure based on the pressure information detected by the pressure detection device. The control system is also used to control the regulating valve 5 to open to the maximum opening degree and control the pump body 4 to reach the maximum speed when the judgment result of the judgment module is yes.

[0050] Furthermore, the judgment module can also receive information sent by multiple detection components. At this time, the multiple detection components can also send parameters such as voltage, current, and temperature at cell 1 to the judgment module of the control system. The control system then judges whether the above parameters are within the preset safety window (i.e., whether there is a sudden change) based on the received pressure, voltage, current, and temperature parameters.

[0051] If the above parameters are within the preset safety window, it indicates that the solid-state battery module is in normal condition. At this time, the control system can also execute a closed-loop control algorithm based on the received parameters such as pressure, voltage, current, and temperature. By adjusting the speed of pump body 4 and the opening of regulating valve 5 through proportional-integral-derivative methods, it can dynamically compensate for the small pressure fluctuations caused by the cell breathing effect and achieve high-precision, low-delay, and stable control of flow and pressure.

[0052] If the above parameters are not within the preset safety window, it indicates that the solid-state battery module is in an abnormal state. For example, if any two of the parameters of pressure, voltage, and temperature simultaneously trigger the threshold (unexpected rapid change in pressure at cell 1, instantaneous drop in voltage of cell 1 or exceeding the safety window, or temperature rise rate of cell 1 exceeding the preset threshold), it is determined to be an early characteristic of thermal runaway and enters an abnormal state. At this time, if the judgment module determines that it is true, the control system quickly controls the regulating valve 5 to open to the maximum opening, so that the cooling medium can quickly flow back to the cooling medium source 3, relieve the pressure on cell 1, leave expansion space for the thermal runaway gas generation of cell 1, and prevent pressure accumulation and explosion. At the same time, the control system can also control the pump body 4 to reach the maximum speed to drive the cooling medium to circulate between cell 1 and cooling structure 2 at the most efficient flow rate, quickly remove the local high temperature generated by the abnormal cell 1 and disperse it to the entire solid-state battery module, thereby achieving early suppression and thermal propagation blocking of thermal runaway of cell 1, and further improving the safety of the solid-state battery module.

[0053] In sleep mode, if the detection component detects that the solid-state battery module has no current input / output for an extended period and is fault-free, the control system can control the solid-state battery module to enter a low-power sleep mode. Specifically, the control component can shut down pump 4 and adjust regulating valve 5 to a locked-down pressure-maintaining state, thereby maintaining the static pressure of the individual battery cell 1. Simultaneously, the detection component and control system can also enter a low-power monitoring mode, periodically waking up to perform parameter checks. Once wake-up events or abnormal characteristics such as voltage, temperature, or pressure are detected, the solid-state battery module is immediately woken up, switching to the operating mode or implementing active suppression strategies under abnormal conditions.

[0054] In summary, the solid-state battery module provided in this embodiment first uses the aforementioned three-stage initialization method of "vacuum-pressure build-lock" to ensure the purity and pressure uniformity of the cooling medium. Through the initialization process of "vacuuming, then circulating and immersing, and finally locking and boosting pressure with multi-point verification," a pure, uniform, and controllable initial external pressure environment is provided for the solid-state battery module. During use, the solid-state battery module can also counteract the "breathing effect" of individual cells using a PID (Proportional Integral Derivative) closed-loop dynamic pressure compensation strategy. This deeply couples the vehicle control system with the battery management system, dynamically counteracting the "breathing effect" of the cells through a closed-loop algorithm, thus upgrading the external pressure from "static holding" to "dynamic precise compensation." Furthermore, in the event of an anomaly, the solid-state battery module can achieve early detection of thermal runaway through "multi-parameter coupling" and an active suppression strategy of "pressure relief-heat dissipation" by cooperating with multiple detection components and the control system, achieving a leap in safety strategy from "passive protection" to "active suppression." When the solid-state battery module is in a low-power sleep mode, it can also cooperate with the control system through multiple detection components to perform "lock-in pressure maintenance" and "low-power monitoring", thereby effectively balancing the energy consumption, pressure maintenance and system rapid response requirements during long-term quiescence.

[0055] Furthermore, such as Figure 8 As shown, the solid-state battery assembly provided in this embodiment may also include a filter 6, which is disposed on the pipeline between the cooling medium source 3 and the regulating valve 5, and is used to filter impurities in the cooling medium source 3.

[0056] like Figure 8 As shown, the solid-state battery assembly provided in this embodiment may also include a cooling structure 7. The cooling structure 7 may include a compressor, a condenser, and a refrigerator. The cooling structure 7 may be disposed on the pipeline between the cooling medium source 3 and the pump body 4. The cooling structure 7 is used to cool and reduce the temperature of the cooling medium flowing to the pump body 4.

[0057] Furthermore, such as Figure 8 As shown, the solid-state battery module may further include a heater 9, which is connected in parallel to one side of the pipeline between the cooling medium source 3 and the pump body 4. The heater 9 and the cooling structure 7 can be selectively activated. The heater 9 is activated when heated medium needs to be supplied to the casing of the battery cell. Based on this, the solid-state battery module provided in this embodiment can also deeply couple the battery immersion oil circuit with the vehicle thermal management system (including oil cooling and heating units) of the electrical device, achieving precise temperature control of the solid-state battery module. This greatly expands the efficient operating temperature range of the solid-state battery module and ensures the power output, energy recovery, and cycle life performance of the solid-state battery module in extremely cold and high temperature environments.

[0058] like Figure 4 As shown, the supply pipeline 20 has multiple supply connectors 201 arranged sequentially along its axial direction, and each supply connector 201 is connected to a corresponding inlet on a multiple outer casing; for example... Figure 5 As shown, the reflux pipe 21 has multiple reflux connectors 211 arranged sequentially along its axial direction, and the multiple reflux connectors 211 are connected to the outlets on the multiple outer shells one by one.

[0059] When multiple supply connectors 201 are distributed sequentially along the axial direction of the supply pipeline 20 and multiple return connectors 211 are distributed sequentially along the axial direction of the return pipeline 21, it is convenient to arrange multiple battery cells 1 sequentially along the axial direction of the supply pipeline 20 and the return pipeline 21, thereby improving the structural compactness of the solid-state battery assembly.

[0060] Both the supply connector 201 and the return connector 211 can be sealed connectors to ensure the sealing between the outer shell and the supply pipeline 20, and to ensure the sealing between the outer shell and the return pipeline 21.

[0061] In one embodiment, such as Figure 2 and Figure 7 As shown, multiple individual battery cells 1 are divided into two groups, with the two groups of individual battery cells 1 distributed along the width direction of the solid-state battery module, and the multiple individual battery cells 1 in each group are stacked along the length direction of the solid-state battery module; as shown Figure 2 and Figure 3 As shown, the supply pipeline 20 is located below the position between the two sets of battery cells 1. The return pipeline 21 includes a return connecting pipe 212 and two return branch pipes 213. The two return branch pipes 213 are respectively located below the mutually distant sides of the two sets of battery cells 1, and the two return branch pipes 213 are connected to each other through the return connecting pipe 212. The return connecting pipe 212 is connected to the cooling medium source 3.

[0062] This configuration can further optimize the layout of the internal structure of solid-state battery modules and improve the structural compactness of solid-state batteries.

[0063] Based on the aforementioned locations of the supply pipe 20 and return pipe 21, the flow direction of the cooling medium in the multiple battery cells 1 is as follows: Figure 6 As indicated by the arrows, the cooling medium flows sequentially through the supply pipe 20 to the outer casing of each individual battery cell 1, then through the outer casing of each individual battery cell 1 to the two return branch pipes 213, and then through the return connecting pipe 212 to the cooling medium source 3.

[0064] like Figure 3 and Figure 4As shown, the supply pipeline 20 includes multiple supply branch pipes 202 connected in sequence, and any two adjacent supply branch pipes 202 in a set are connected by a supply series pipe 203; as Figure 3 and Figure 5 As shown, the return branch pipe 213 includes a plurality of return branch pipes 2130 connected in sequence, and any two adjacent return branch pipes 2130 are connected by a return series pipe 2131.

[0065] When the supply pipeline 20 is formed by connecting the supply branch pipe 202 and the supply series pipe 203, the layout flexibility of the supply pipeline 20 can be improved. Similarly, when the return branch pipe 213 is formed by connecting the return branch pipe 2130 and the return series pipe 2131, the layout flexibility of the return branch pipe 213 can be improved.

[0066] Both the supply series pipe 203 and the return series pipe 2131 can be bent pipes, so that the return series pipe 2131 and the return series pipe 2131 can make way for other structural components inside the solid-state battery module.

[0067] To facilitate the connection between the supply branch pipe 202 and the supply series pipe 203, as well as the connection between the supply branch pipe 202 and the outer casing inlet, such as Figure 4 As shown, the end of the supply branch pipe 202 may be provided with a series connector 22. Correspondingly, to facilitate the connection between the return branch pipe 2130 and the return series pipe 2131, and to facilitate the connection between the return branch pipe 2130 and the outer casing outlet, as shown... Figure 5 As shown, the end of the return diversion pipe 2130 may also be provided with a series connector 22.

[0068] like Figure 1 and Figure 2 As shown, the solid-state battery assembly provided in this embodiment also includes a housing structure 8 and a pressure plate 80. The pressure plate 80, the cooling structure 2 and multiple battery cells 1 are all installed inside the housing structure 8, and the pressure plate 80 and the cooling structure 2 respectively abut against both sides of the multiple battery cells 1.

[0069] The housing structure 8 is used to seal and protect the cooling structure 2 and the battery cell 1, and the pressure plate 80 is used to improve the installation stability of the cooling structure 2 and the battery cell 1 within the housing structure 8.

[0070] The pressure plate 80 can be fixedly connected to the crossbeam at the bottom of the housing structure 8 using bolts or other fasteners. The crossbeam is used to separate the two groups of battery cells 1.

[0071] Furthermore, the pressure plate 80 can be made of high-strength alloy steel or high-strength aluminum alloy.

[0072] like Figure 2As shown, multiple battery cells 1 can be bonded and fixed to the pressure plate 80 with structural adhesive 81, and multiple battery cells 1 can also be bonded and fixed to the bottom of the housing structure 8 with structural adhesive 81.

[0073] The thickness of structural adhesive 81 can be 0.8-1mm.

[0074] Furthermore, such as Figure 2 As shown, the shell structure 8 may include an upper shell 82 and a lower shell 83, which are formed by the mating of the upper shell 82 and the lower shell 83.

[0075] The upper casing 82 can be made of high-strength alloy steel, magnesium alloy, aluminum alloy, or other metal materials or composite materials, and can be manufactured by stamping. The lower casing 83 is the core carrier and protective structure of the solid-state battery module. The lower casing 83 can be made of high-strength aluminum alloy, alloy steel, or other metal materials, and can be formed by extrusion followed by welding and stamping or by casting.

[0076] like Figure 2 As shown, the solid-state battery assembly provided in this embodiment also includes a high-voltage and low-voltage unit assembly 84. The high-voltage and low-voltage unit assembly 84 is an inherent structure of the solid-state battery. The high-voltage and low-voltage unit assembly 84 includes a high-voltage circuit and a low-voltage circuit. The high-voltage circuit consists of a BDU (Battery Disconnect Unit), connecting copper busbars, aluminum busbars and other connecting conductive components. The low-voltage circuit consists of a BMS master control, slave control and acquisition control lines.

[0077] This embodiment also provides a battery pack, which includes the above-mentioned solid-state battery components. The solid-state battery components can be multiple and connected in series and parallel to form a battery pack. The battery pack provided in this embodiment can also connect the outer shell of each cell 1 to the cooling structure 2, so that the cell body of each cell 1 is immersed in the cooling medium, thereby timely and effectively cooling each cell 1 of the solid-state battery component, effectively improving the overall cooling effect of the solid-state battery, and thus improving the overall cooling effect of the battery pack.

[0078] Figure 9 An exemplary structure of the battery pack is shown, such as Figure 9 As shown, the battery pack includes a housing 90 and multiple solid-state battery components disposed within the housing 90. The housing 90 may include a lower housing and an upper housing. The upper housing covers the lower housing and together with the lower housing forms a closed space for accommodating the solid-state battery components. The multiple solid-state battery components can be arranged in the housing 90 in any manner.

[0079] Furthermore, compared to the three-level assembly architecture of solid-state batteries in the prior art, which consists of "cell-module-battery pack", the solid-state battery components in this embodiment can be directly stacked and integrated to form a battery pack. The module-free design concept minimizes the use of non-energy storage structural components and significantly improves the spatial assembly efficiency and volumetric energy density of solid-state batteries.

[0080] like Figure 9 As shown, this embodiment also provides an electrical device, which includes the aforementioned battery pack. The battery pack can be used as the power source for the electrical device or as the energy storage unit of the electrical device. The electrical device can be a mobile device (typically such as a mobile phone, laptop computer, etc.), an electric vehicle (typically such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, or an energy storage system, etc.

[0081] Since the power supply device provided in this embodiment includes the above-mentioned battery pack, the power supply device can also connect the outer shell of each cell 1 to the cooling structure 2, so that the cell body of each cell 1 is immersed in the cooling medium, thereby timely and effectively cooling each cell 1 of the solid-state battery assembly, effectively improving the overall cooling effect of the solid-state battery, and thus improving the overall cooling effect of the battery pack.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid-state battery module, characterized in that, It includes multiple battery cells (1) and a cooling structure (2); Each of the battery cells (1) includes a casing and a battery cell body, the battery cell body being disposed inside the casing, and each casing having an inlet and an outlet; The cooling structure (2) includes a supply pipe (20) and a return pipe (21). The supply pipe (20) and the return pipe (21) are respectively connected to the cooling medium source (3). The inlet of each shell is connected to the supply pipe (20), and the outlet of each shell is connected to the return pipe (21).

2. The solid-state battery module according to claim 1, characterized in that, It also includes a pump body (4), a regulating valve (5), and a control system; The pump body (4) is installed on the pipeline between the supply pipeline (20) and the cooling medium source (3), and the regulating valve (5) is installed on the pipeline between the return pipeline (21) and the cooling medium source (3); Each of the battery cells (1) is provided with a pressure detection device. The pump body (4), the regulating valve (5) and the multiple pressure detection devices are all connected to the control system. The control system has a preset pressure threshold. The control system is used to receive the pressure information and pressurization command detected by each of the pressure detection devices, and close the regulating valve (5) and increase the speed of the pump body (4) according to the pressurization command so that the pressure value at each of the battery cells (1) reaches the pressure threshold.

3. The solid-state battery module according to claim 2, characterized in that, It also includes multiple detection components, which are connected one-to-one with multiple battery cells (1). The detection components are used to detect the operating parameters of their corresponding battery cells (1). Multiple detection components are connected to the control system. The control system is used to calculate compensation parameters based on the parameter information detected by the multiple detection components and the pressure information detected by the multiple pressure detection devices, and adjust the opening of the regulating valve (5) and the rotation speed of the pump body (4) based on the compensation parameters so that the pressure value at each battery cell (1) is maintained at the pressure threshold.

4. The solid-state battery module according to claim 2, characterized in that, The control system includes a judgment module, which is used to determine whether a sudden change in pressure occurs based on the pressure information detected by the pressure detection device. The control system is also used to control the regulating valve (5) to open to the maximum opening degree and control the pump body (4) to reach the maximum speed when the judgment result of the judgment module is yes.

5. The solid-state battery module according to any one of claims 1-4, characterized in that, The supply pipeline (20) has a plurality of supply connectors (201) arranged sequentially along its axial direction, and the plurality of supply connectors (201) are connected to the plurality of inlets on the outer shell in a one-to-one correspondence. The reflux pipe (21) has a plurality of reflux connectors (211) arranged sequentially along its axial direction, and the plurality of reflux connectors (211) are connected to the outlets on the plurality of outer shells one by one.

6. The solid-state battery module according to any one of claims 1-4, characterized in that, The multiple battery cells (1) are divided into two groups, and the two groups of battery cells (1) are distributed along the width direction of the solid-state battery assembly, and the multiple battery cells (1) in each group of battery cells (1) are stacked along the length direction of the solid-state battery assembly. The supply pipeline (20) is located below the position between the two sets of battery cells (1). The return pipeline (21) includes a return connecting pipe (212) and two return branch pipes (213). The two return branch pipes (213) are respectively located below the mutually distant sides of the two sets of battery cells (1), and the two return branch pipes (213) are connected to each other through the return connecting pipe (212). The return connecting pipe (212) is connected to the cooling medium source (3).

7. The solid-state battery module according to claim 6, characterized in that, The supply pipeline (20) includes a plurality of supply branch pipes (202) connected in sequence, and any two adjacent supply branch pipes (202) are connected by a supply series pipe (203); The return branch pipe (213) includes a plurality of return branch pipes (2130) connected in sequence, and any two adjacent return branch pipes (2130) are connected by a return series pipe (2131).

8. The solid-state battery module according to any one of claims 1-4, characterized in that, It also includes a housing structure (8) and a pressure plate (80), wherein the pressure plate (80), the cooling structure (2) and the plurality of battery cells (1) are all installed inside the housing structure (8), and the pressure plate (80) and the cooling structure (2) respectively abut against the two sides of the plurality of battery cells (1).

9. A battery pack, characterized in that, Includes the solid-state battery assembly as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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