Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment. A sealing cavity is formed in the shell assembly; the battery cell group is arranged in the sealing cavity, and the battery cell group comprises a plurality of battery cells which are arranged at intervals in the first direction; the cooling mechanism is arranged in the sealing cavity, and the cooling mechanism is used for cooling the battery cell group; the sealing cavity is filled with the pressure transmitting medium, the gap between every two adjacent battery cells is filled with the pressure transmitting medium, and the pressure transmitting medium is used for forming an isostatic pressing environment in the sealing cavity. The battery pack provided by the invention can realize uniform compression of the large surface of the battery cell, increase the contact area between the electrolyte in the battery cell and the electrode, and improve the lithium ion transmission effect.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] Solid-state battery packs typically consist of a casing and an internal array of multiple battery cells. When multiple cells are stacked, the large surfaces of adjacent cells are in contact with each other. The electrolyte inside the cell is a solid electrolyte, which is a rigid material and has physical gaps with the electrodes, leading to poor interfacial contact. Poor contact increases the interfacial resistance for ion transport, hindering the migration of lithium ions between the electrodes and the electrolyte, and affecting the performance of the solid-state battery cell itself.

[0003] In existing technologies, a large compressive force is applied to the battery cell assembly to ensure interface adhesion, thereby increasing the effective contact area and reducing impedance.

[0004] However, in the aforementioned related technologies, the large surface area of ​​the battery cells in the battery pack cannot be uniformly compressed, resulting in poor interfacial contact between the electrolyte and the electrodes within the cell, which affects the lithium-ion transport effect. Summary of the Invention

[0005] This application provides a battery pack and electrical device to solve the technical problem in the above-mentioned related technologies that the large surface of the battery cell in the battery pack cannot be uniformly pressed, resulting in poor interface contact between the electrolyte and the electrode in the battery cell, which affects the lithium-ion transport effect.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a battery pack, comprising:

[0008] The housing assembly has a sealed cavity inside;

[0009] A battery cell assembly is disposed within the sealed cavity, the battery cell assembly comprising a plurality of battery cells spaced apart along a first direction;

[0010] A cooling mechanism is disposed within the sealed cavity, and the cooling mechanism is used to dissipate heat from the battery cell assembly;

[0011] A pressure-transmitting medium fills the interior of the sealed cavity and is also filled in the gap between each two adjacent cells, the pressure-transmitting medium being used to create an isostatic pressure environment within the sealed cavity.

[0012] This application provides a battery pack that achieves an isostatic pressure environment for solid-state cells through the synergistic effect of a sealed cavity and a pressure-transmitting medium. The sealed cavity formed by the housing assembly provides a closed pressurization space for the pressure-transmitting medium, preventing pressure leakage. The design of the cells arranged at intervals along a first direction satisfies the thermal expansion margin requirements between cells and provides a flow channel for the pressure-transmitting medium. The cooling mechanism is integrated inside the sealed cavity, enabling direct thermal management of the cells while maintaining the isostatic pressure environment, avoiding the disruption of pressure field uniformity caused by traditional external cooling systems.

[0013] The pressure-transmitting medium completely fills the gaps between the cells and the entire sealed cavity, applying uniform pressure to all surfaces of the cells using the principles of hydrostatics. This overcomes the limitation of mechanical pressure devices, which can only apply pressure in a single axis. Especially for cases where the flatness of large areas of the cell is insufficient, three-dimensional isostatic pressure is used to forcibly eliminate interface gaps and improve the contact tightness between the electrodes and the electrolyte. This combined solution breaks through the limitations of traditional solid-state battery modules that rely on mechanical restraint devices, achieving dynamic pressure maintenance during cell operation.

[0014] In one possible implementation, the cooling mechanism includes:

[0015] A first cold plate assembly is disposed on one side of the battery cell assembly along a second direction, and the first cold plate assembly is used to dissipate heat from the battery cell assembly.

[0016] The second direction is perpendicular to the first direction.

[0017] In one possible implementation, the first cold plate assembly includes:

[0018] The first cold plate is used to dissipate heat for the battery cell assembly;

[0019] A first comb tooth structure is disposed between the first cold plate and the battery cell assembly along the second direction. Each pair of adjacent comb teeth in the first comb tooth structure is used to clamp one battery cell, and the two adjacent battery cells are spaced apart along the first direction.

[0020] In one possible implementation, the cooling mechanism further includes:

[0021] The second cold plate assembly is disposed along the second direction on the surface of the battery cell assembly facing away from the first cold plate assembly, and the second cold plate assembly is used to dissipate heat from the battery cell assembly.

[0022] In one possible implementation, the second cold plate assembly includes:

[0023] The second cooling plate is used to dissipate heat from the battery cell assembly;

[0024] The second comb tooth structure is disposed between the second cold plate and the battery cell assembly along the second direction. Each pair of adjacent comb teeth in the second comb tooth structure is used to clamp one battery cell, and the two adjacent battery cells are spaced apart along the second direction.

[0025] In one possible implementation, the battery pack further includes a voltage regulating component;

[0026] The pressure regulating component is disposed in the housing and communicates with the sealed cavity. The pressure regulating component adjusts the pressure in the sealed cavity by acting on the pressure transmitting medium.

[0027] In one possible implementation, the voltage regulating component includes:

[0028] A pressurizing structure is provided for allowing external devices to introduce the pressure-transmitting medium into the sealed cavity through the pressurizing structure, and the pressurizing structure is also used to increase the pressure inside the sealed cavity;

[0029] A pressure relief structure is provided at an interval from the pressurization structure. The pressure relief structure is used to allow external equipment to extract the pressure-transmitting medium in the sealed cavity through the pressure relief structure. The pressure relief structure is also used to reduce the pressure in the sealed cavity.

[0030] One possible implementation also includes:

[0031] The detection element is used to detect the pressure inside the sealed cavity;

[0032] A control unit, connected to the detection unit, is used to acquire the parameters acquired by the detection unit;

[0033] The control element is also used for controllable connection with the pressurizing structure and the depressurizing structure, and the control element is used to adjust the pressure in the sealing cavity by controlling the pressurizing structure and the depressurizing structure.

[0034] In one possible implementation, the pressure transmission medium is hydraulic oil.

[0035] In one possible implementation, the battery pack further includes:

[0036] The lead-out component has one end connected to the battery cell assembly inside the sealed cavity, and the other end passes through the housing and extends to the outside.

[0037] A sealing assembly for sealing the gap between the lead-out member and the housing.

[0038] In one possible implementation, the housing is provided with a first through hole through which the lead-out member can pass;

[0039] The sealing assembly includes a pressure plate and a sealing ring; the pressure plate has a second through hole, the pressure plate covers the first through hole, and the lead-out member passes through the second through hole and further through the first through hole;

[0040] The sealing ring is used to seal the joint between the pressure plate and the first through hole.

[0041] In one possible implementation, the lead-out member is integrally formed with the pressure plate;

[0042] The sealing assembly further includes an insulating layer disposed on the surface of the pressure plate facing the housing, the pressure plate being connected to the housing via the insulating layer.

[0043] In one possible implementation, the housing assembly includes:

[0044] A tray having a receiving cavity and an opening communicating with the receiving cavity for receiving the battery cell assembly;

[0045] The top cover is disposed over the opening and forms a sealed cavity with the tray.

[0046] In one possible implementation, the tray and the top cover are connected by welding;

[0047] The housing assembly also includes a plurality of connectors for fastening the top cover and the tray together.

[0048] In one possible implementation, the battery pack further includes a covering layer that wraps around the outer surface of the housing assembly.

[0049] A second aspect of this application provides an electrical device including an electrical appliance and a battery pack as described above, the battery pack being used to supply power to the electrical appliance. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0052] Figure 2 An exploded view of a battery pack provided in an embodiment of this application;

[0053] Figure 3 A cross-sectional view of a battery pack provided in an embodiment of this application;

[0054] Figure 4 for Figure 3 A partial schematic diagram at point A in the middle;

[0055] Figure 5 for Figure 3 A partial schematic diagram at point B in the middle;

[0056] Figure 6 A cross-sectional view of a battery pack provided in an embodiment of this application;

[0057] Figure 7 for Figure 6 A partial schematic diagram at point D in the middle;

[0058] Figure 8 A cross-sectional view of a battery pack provided in an embodiment of this application;

[0059] Figure 9 for Figure 8 A partial schematic diagram at point C in the middle;

[0060] Figure 10 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application.

[0061] Explanation of reference numerals in the attached figures:

[0062] 100. Housing assembly;

[0063] 110. Sealed cavity; 120. First through hole; 130. Tray; 140. Top cover;

[0064] 150. Connectors;

[0065] 200. Battery cell pack;

[0066] 210. Battery cells;

[0067] 300. Cooling mechanism;

[0068] 310. First cold-rolled steel plate assembly; 320. Second cold-rolled steel plate assembly;

[0069] 311. First cold-rolled plate; 312. First comb tooth structure; 321. Second cold-rolled plate;

[0070] 322. Second comb tooth structure;

[0071] 400. Pressure transmission medium;

[0072] 500. Voltage regulating component;

[0073] 510. Pressurization structure; 520. Pressure relief structure; 530. Testing component;

[0074] 600. Lead-out component;

[0075] 700. Sealing components;

[0076] 710. Pressure plate; 720. Sealing ring; 730. Insulation layer;

[0077] 800, Coating layer;

[0078] 900, Adhesive layer. Detailed Implementation

[0079] As described in the background section, the large surface area of ​​the battery cell in the aforementioned related technologies cannot be uniformly compressed, resulting in poor interfacial contact between the electrolyte and the electrode within the cell, which affects the lithium-ion transport effect.

[0080] The reason for this problem lies in the long-standing issue of increased impedance caused by poor interface contact in the field of solid-state batteries. Traditional solutions use mechanical pressure devices to apply pressure to the end faces of the cell stack, but due to the flatness error of the cells themselves, local stress concentration is easily generated during the pressure application process, resulting in uncompacted gap areas between adjacent cells. This non-uniform pressure distribution prevents the solid electrolyte and electrode interface from achieving complete adhesion, obstructs ion transport paths, and seriously affects battery cycle life and energy density.

[0081] To address the aforementioned issues, this application provides a battery pack and electrical device. This technical solution achieves an isostatic pressure environment for solid-state batteries through the synergistic effect of a sealed cavity and a pressure-transmitting medium. The sealed cavity formed by the housing assembly provides a closed pressurization space for the pressure-transmitting medium, preventing pressure leakage. The design of the battery cells arranged at intervals along a first direction satisfies the thermal expansion margin requirements between cells and provides a flow channel for the pressure-transmitting medium. The cooling mechanism is integrated inside the sealed cavity, enabling direct thermal management of the battery cells while maintaining the isostatic pressure environment, avoiding the disruption of pressure field uniformity caused by traditional external cooling systems.

[0082] The pressure-transmitting medium completely fills the gaps between the cells and the entire sealed cavity, applying uniform pressure to all surfaces of the cells using the principles of hydrostatics. This overcomes the limitation of mechanical pressure devices, which can only apply pressure in a single axis. Especially for cases where the flatness of large areas of the cell is insufficient, three-dimensional isostatic pressure is used to forcibly eliminate interface gaps and improve the contact tightness between the electrodes and the electrolyte. This combined solution breaks through the limitations of traditional solid-state battery modules that rely on mechanical restraint devices, achieving dynamic pressure maintenance during cell operation.

[0083] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0084] refer to Figure 1 , Figure 2 and Figure 3 This application provides a battery pack, which may include a housing assembly 100, a cell assembly 200, a cooling mechanism 300, and a pressure transmission medium 400.

[0085] The housing assembly 100 has a sealed cavity 110 inside. The housing assembly 100 refers to a sealed container made of high-strength metal stamping parts. Specifically, it can be realized by combining a titanium alloy stamped top cover 140 and a tray 130, and forming an airtight sealed space by bolt fastening and laser welding.

[0086] The battery cell assembly 200 is disposed within the sealed cavity 110, and the battery cell assembly 200 may include multiple cells arranged along a first direction (e.g., ...). Figure 2 The battery cells 210 are arranged at intervals along the X direction. Here, the arrangement of the battery cells 200 along the first direction means that multiple battery cells 210 are arranged at a preset distance on the horizontal plane.

[0087] The cooling mechanism 300 is disposed within the sealed cavity 110 and is used to dissipate heat from the battery cell assembly 200. The cooling mechanism 300 refers to a heat exchange device integrated within the sealed cavity 110, which can be implemented using a metal cold plate structure with heat dissipation channels, the surface of which is in direct contact with the battery cell 210 to conduct heat.

[0088] The pressure-transmitting medium 400 fills the interior of the sealed cavity 110 and fills the gap between each two adjacent cells 210. The pressure-transmitting medium 400 is used to create an isostatic pressure environment inside the sealed cavity 110.

[0089] Among them, the pressure transmission medium 400 refers to a pressure transmission material with low fluidity and compressibility, which can be silicone oil, ionic liquid or gas, and converts external pressure into a three-dimensional static pressure load by filling the gap of the battery cell 210.

[0090] This application provides a battery pack that achieves an isostatic pressure environment for the solid-state battery cells 210 through the synergistic effect of a sealed cavity 110 and a pressure-transmitting medium 400. The sealed cavity 110 formed by the housing assembly 100 provides a closed pressurization space for the pressure-transmitting medium 400, preventing pressure leakage. The design of the battery cell group 200 arranged at intervals along a first direction satisfies the thermal expansion margin requirements between the battery cells 210 and provides a flow channel for the pressure-transmitting medium 400. The cooling mechanism 300 is integrated inside the sealed cavity 110, enabling direct thermal management of the battery cells 210 while maintaining the isostatic pressure environment, avoiding the disruption of pressure field uniformity caused by traditional external cooling systems.

[0091] The pressure-transmitting medium 400 completely fills the gaps between the cells 210 and the entire sealed cavity 110. Utilizing the principles of hydrostatics, it applies uniform pressure to all surfaces of the cells 210, overcoming the limitation of mechanical pressure devices that can only apply pressure in a single axis. Especially for cases where the large surfaces of the cells 210 lack flatness, it uses three-dimensional isostatic pressure to forcibly eliminate interface gaps, improving the contact tightness between the electrodes and the electrolyte. This combined solution overcomes the limitations of traditional solid-state battery modules that rely on mechanical restraint devices, achieving dynamic pressure maintenance of the cells 210 during operation.

[0092] In some embodiments, the pressure transmission medium 400 is hydraulic oil. This technical solution uses hydraulic oil as the pressure transmission medium. Since hydraulic oil has a smaller compressibility ratio than gaseous pressure transmission media 400, it is easier to accurately control the compression amount, thereby helping to improve the isostatic pressure regulation accuracy within the battery pack.

[0093] refer to Figure 2 , Figure 3 and Figure 4 In some embodiments, the cooling mechanism 300 may include a first cold plate assembly 310. The first cold plate assembly 310 is disposed on the cell assembly 200 along a second direction (e.g., Figure 3 On one side of the X direction, the first cold plate assembly 310 is used to dissipate heat for the battery cell assembly 200. The second direction is perpendicular to the first direction.

[0094] This technical solution constructs a heat dissipation path orthogonal to the arrangement direction of the battery cells 210 by defining the spatial layout direction of the first cold plate assembly 310 in the cooling mechanism 300. Specifically, the design of arranging the first cold plate assembly 310 along the second direction on the side of the battery cell assembly 200 ensures that the extension direction of the first cold plate assembly 310 is spatially orthogonal to the first direction of the battery cell arrangement. This vertical layout ensures that the cold plate can cover the side heat dissipation surface of the battery cell assembly 200, and avoids the problem of obstructed flow of the pressure transmission medium 400 that might be caused by arranging the cold plate along the stacking direction of the battery cells 210.

[0095] By setting the second direction perpendicular to the first direction, the extension direction of the heat dissipation surface of the first cold plate assembly 310 and the distribution direction of the gaps between the battery cells 210 are spatially complementary when the heat dissipation function is implemented. This ensures the maximum utilization of the heat dissipation surface and provides a spatial layout basis for the limiting function of the subsequent comb structure. The first cold plate assembly 310 itself acts as a heat dissipation carrier. Its layout on the side of the second direction can form a lateral heat dissipation channel without interfering with the arrangement density of the battery cell group 200 in the first direction. This spatial layout innovatively solves the spatial conflict between traditional heat dissipation structures and isostatic medium distribution.

[0096] refer to Figure 2 , Figure 3 and Figure 4 In some embodiments, the first cold plate assembly 310 may include a first cold plate 311 and a first comb structure 312. The first cold plate 311 is used to dissipate heat for the battery cell assembly 200. Along a second direction, the first comb structure 312 is disposed between the first cold plate 311 and the battery cell assembly 200, and each pair of adjacent comb teeth in the first comb structure 312 is used to clamp one battery cell 210, and the adjacent two battery cells 210 are spaced apart along the first direction. The second cold plate 321 is adhered to the inner wall of the sealing cavity 110 by an adhesive layer.

[0097] In some embodiments, structural adhesive can be filled in the gap between two adjacent comb teeth to facilitate the bonding and fixing of the battery cell 210 to the gap between the two comb teeth through the structure.

[0098] This technical solution achieves precise positioning and gap control of the battery cells 210 by setting a comb-tooth structure between the first cold plate 311 and the battery cell assembly 200. The first cold plate 311, as a basic heat dissipation component, provides basic heat dissipation for the battery cell assembly 200 through its planar structure. The first comb-tooth structure 312 is arranged perpendicular to the arrangement direction of the battery cells 210, and the clamping space formed by adjacent comb teeth directly constrains the position of individual battery cells 210, forcing adjacent battery cells 210 to maintain a predetermined spacing. This structural design allows the battery cells 210 to no longer rely on their own flatness during stacking, but instead ensures spacing uniformity through mechanical limiting, creating the necessary conditions for the pressure-transmitting medium 400 to immerse in the gap.

[0099] The thickness parameters of the first comb structure 312 can be customized according to the expansion characteristics of different battery cells 210, ensuring both the uniformity of pressure transmission and preventing the battery cells 210 from deforming under pressure. The integrated design of the first cold plate 311 and the first comb structure 312 combines heat dissipation and structural limiting functions, expanding the spatial positioning capability on the basis of traditional heat spreaders, forming a multi-dimensional thermal management and mechanical constraint system.

[0100] refer to Figure 2 , Figure 3and Figure 4 In some embodiments, the cooling mechanism 300 may further include a second cold plate assembly 320. Along the second direction, the second cold plate assembly 320 is disposed on the surface of the cell assembly 200 facing away from the first cold plate assembly 310, and the second cold plate assembly 320 is used to dissipate heat from the cell assembly 200.

[0101] This technical solution achieves the synergistic heat dissipation effect of dual cold plates by adding a second cold plate assembly 320 to the surface of the cell assembly 200 facing away from the first cold plate assembly 310. The second cold plate assembly 320 is positioned along the second direction, forming a spatially symmetrical layout with the first cold plate assembly 310. This allows the other side of the cell assembly 200 in the second direction to obtain a direct heat dissipation path, effectively improving the overall heat dissipation capacity. Placing the second cold plate assembly 320 on the surface of the cell assembly 200 facing away from the original cold plate assembly overcomes the limitations of traditional single-sided heat dissipation structures, enhancing heat exchange efficiency through a bidirectional heat dissipation path design.

[0102] This layout also provides a physical support basis for the alignment and positioning of the subsequent comb structure. The clamping effect of the cold plate assemblies on both sides maintains the uniformity of the gap of the cell group 200 in the second direction, avoiding excessive local gaps caused by the flatness deviation of the cell 210, thereby ensuring that the pressure transmission medium 400 can fully fill all the gaps of the cell 210.

[0103] refer to Figure 2 , Figure 3 and Figure 4 In some embodiments, the second cold plate assembly 320 may include a second cold plate 321 and a second comb structure 322. The second cold plate 321 is used to dissipate heat for the battery cell assembly 200. Along a second direction, the second comb structure 322 is disposed between the second cold plate 321 and the battery cell assembly 200, and each pair of adjacent comb teeth in the second comb structure 322 is used to clamp one battery cell 210, and the adjacent two battery cells 210 are spaced apart along the second direction. The second cold plate 321 is adhered to the inner wall of the sealing cavity 110 by an adhesive layer.

[0104] In this technical solution, the second cold plate 321 maintains the operating temperature stability of the cell assembly 200 through heat dissipation, while the second comb structure 322 is arranged between the second cold plate 321 and the cell assembly 200 along the second direction. By clamping a single cell 210 between two adjacent comb teeth, the cells 210 are forced to maintain a uniform spacing along the second direction. This structural design, combined with the first comb structure 312 in the first cold plate assembly 310, forms a bidirectional limiting mechanism, ensuring the uniformity of the gap between the cells 210 in the second direction, thereby avoiding gap deviations caused by differences in the flatness of the cells 210 themselves or by traditional unilateral limiting.

[0105] Through the synergistic effect of the second comb tooth structure 322 and the first comb tooth structure 312, the gaps of the battery cell 210 in multiple dimensions are effectively controlled, ultimately achieving a uniform distribution of the liquid pressure transmission medium 400 within the gaps of the battery cell 210, providing a stable isostatic pressure environment for the solid-state battery cell 210.

[0106] refer to Figure 3 and Figure 5 In some embodiments, housing assembly 100 may include tray 130 and cover 140.

[0107] The tray 130 has a receiving cavity and an opening communicating with the receiving cavity, the receiving cavity being used to receive the battery cell assembly 200. The top cover 140 covers the opening and forms a sealed cavity 110 with the tray 130.

[0108] This technical solution, by configuring the housing assembly 100 as a top cover 140 and a tray 130, with the top cover 140 and the tray 130 detachably connected, enables the disassembly and maintenance of the housing assembly 100. Furthermore, by disassembling the top cover 140 and the tray 130, placing the battery cell assembly 200 on the tray 130, and then sealing the opening with the top cover 140, the assembly of components within the sealed cavity 110, such as the battery cell assembly 200, is facilitated, thereby improving assembly convenience.

[0109] In some embodiments, the top cover 140 and the tray 130 can both be made of high-strength steel by die casting, casting, stamping or other methods to ensure the overall rigidity of the housing assembly 100 and the constraint effect on the battery cell assembly 200.

[0110] In some embodiments, the joints of the surfaces of the top cover 140 are rounded to prevent fatigue cracking of the top cover 140 at these joints due to stress concentration. Similarly, the joints of the surfaces of the tray 130 can also be rounded to prevent fatigue cracking of the tray 130 at these joints due to stress concentration.

[0111] refer to Figure 3 and Figure 5 In some embodiments, the tray 130 and the cover 140 are connected by welding. The housing assembly 100 may also include a plurality of connectors 150 for fastening the cover 140 and the tray 130 together.

[0112] This technical solution improves the connection stability between the top cover 140 and the tray 130 by using two connection methods: welding and connection with connector 150. It also prevents the connection between the tray 130 and the top cover 140 from failing due to excessive pressure inside the sealing cavity 110.

[0113] In some embodiments, the connector 150 may be a threaded connector 150, such as a skirted sealing bolt, which can increase the connection strength between the cover 140 and the tray 130 while also increasing the sealing performance between the cover 140 and the tray 130.

[0114] refer to Figure 6 and Figure 7 In some embodiments, the battery pack may further include a lead-out member 600 and a sealing assembly 700. One end of the lead-out member 600 is connected to the cell assembly 200 within the sealed cavity 110, and the other end passes through the housing and extends to the outside. The sealing assembly 700 is used to seal the gap between the lead-out member 600 and the housing.

[0115] The lead-out component 600 is a conductive component that enables the battery cell assembly 200 to conduct electricity with the external circuit. It can be implemented using a copper busbar or an aluminum busbar, which penetrates the housing to form an electrical connection channel. While maintaining the transmission of electrical signals, this component also forms a through-opening in the housing structure, becoming a potential leakage path for the pressure-transmitting medium 400.

[0116] The sealing assembly 700 refers to the sealing structure used to close the gap between the lead-out member 600 and the housing. Specifically, it can be implemented by combining a pressure plate 710 and a sealing ring 720. The pressure plate 710 covers the through hole of the housing and applies uniform pressure, causing the sealing ring 720 to deform and fill the gap. The insulating layer 730 isolates the risk of electrical conduction. Through the synergistic effect of the multi-layer structure, this assembly maintains electrical continuity while blocking the leakage path of the pressure-transmitting medium 400.

[0117] This technical solution addresses the potential leakage of the pressure-transmitting medium 400 when the battery cell assembly 200 is connected to an external circuit by employing a dual structure of lead-out component 600 and sealing assembly 700. One end of the lead-out component 600 connects to the battery cell assembly 200 for electrical signal transmission, while the other end extends through the housing to the outside, forming a physical channel. However, the presence of this channel compromises the integrity of the housing. The sealing assembly 700 physically seals the mating gap between the lead-out component 600 and the housing, blocking the leakage path of the pressure-transmitting medium 400.

[0118] The through-type design of the lead-out component 600 ensures electrical connection while maintaining electrical connectivity between the battery pack 200 and the outside world through the encapsulation seal of the sealing component 700, while also ensuring the airtightness of the sealing cavity 110. The structural choice of the sealing component 700 directly affects the sealing reliability. It applies uniform pressure through the combination of the pressure plate 710 and the sealing ring 720, causing the sealing ring 720 to deform and fill the gap. At the same time, the insulation layer 730 further isolates the risk of electrical contact, forming a multi-layered anti-leakage barrier.

[0119] refer to Figure 6 and Figure 7In some embodiments, the housing assembly 100 has a first through hole 120 through which the lead-out member 600 passes. The sealing assembly 700 may include a pressure plate 710 and a sealing ring 720. The pressure plate 710 has a second through hole and covers the first through hole 120. The lead-out member 600 passes through the second through hole and further through the first through hole 120. The sealing ring 720 is used to seal the mating area between the pressure plate 710 and the first through hole 120.

[0120] The pressure plate 710 refers to a plate-shaped component covering the first through hole 120 of the housing. It can be formed by stamping aluminum alloy sheet, and its second through hole diameter forms an interference fit with the outer diameter of the lead-out part 600. This structure achieves uniform clamping force on the sealing ring 720 through planar coverage. The sealing ring 720 is an annular elastic seal, which can be made of fluororubber material and fills the microscopic gap between the pressure plate 710 and the housing through compression deformation.

[0121] This technical solution achieves a dual sealing effect through the combination structure of pressure plate 710 and sealing ring 720. Pressure plate 710 covers the first through hole 120 and guides the lead-out piece 600 through the second through hole. Its planar covering design ensures that the sealing ring 720 is evenly compressed under the action of pressure plate 710, thereby effectively sealing the joint gap between the first through hole 120 and pressure plate 710.

[0122] refer to Figure 6 and Figure 7 In some embodiments, the lead-out member 600 is integrally formed with the pressure plate 710. The sealing assembly 700 may also include an insulating layer 730 disposed on the surface of the pressure plate 710 facing the housing, and the pressure plate 710 is connected to the housing through the insulating layer 730.

[0123] The integral molding refers to the casting of part 600 and pressure plate 710 into a single structure through casting or injection molding. Specifically, aluminum alloy die casting process can be used to eliminate gaps caused by separate assembly. The insulating layer 730 refers to a coating with electrical insulating properties, which can be a polyimide film or a ceramic coating, and is fixed to the surface of pressure plate 710 by an adhesive.

[0124] The lead-out component 600 and the pressure plate 710 are integrally molded, eliminating the assembly gap between the lead-out component 600 and the second through hole in the traditional split structure, fundamentally preventing the leakage path of the pressure-transmitting medium 400 along the axial direction of the lead-out component 600. The insulating layer 730 is disposed between the pressure plate 710 and the housing contact surface, physically isolating and blocking the current conduction path, ensuring both the structural stability of the sealing assembly 700 and providing insulation protection between the housing and electrical components. The synergistic effect of these technical features ensures sealing performance while also considering the electrical safety requirements of the battery pack under high-voltage conditions.

[0125] refer to Figure 8 and Figure 9 In some embodiments, the battery pack may also include a voltage regulating component 500, which is disposed in the housing and communicates with the sealed cavity 110. The voltage regulating component 500 adjusts the pressure in the sealed cavity 110 by acting on the pressure transmitting medium 400.

[0126] The pressure regulating component 500 refers to a fluid pressure regulating device that communicates with the sealing cavity 110. Specifically, it can be implemented by an integrated module that includes a pressure-increasing valve and a pressure-reducing valve. It can be connected to the pressure-increasing valve through an external compressor to inject the pressure-transmitting medium 400, or discharge the pressure-transmitting medium 400 through the pressure-reducing valve to change the pressure inside the sealing cavity 110.

[0127] This technical solution, through the setting of the voltage regulating component 500, enables the battery pack to dynamically adjust its internal pressure according to actual needs. The connection design between the voltage regulating component 500 and the sealed cavity 110 establishes a pressure regulation channel, achieving precise control of the isostatic pressure environment by actively intervening in the physical state of the pressure transmission medium 400. The pressure increasing structure 510 and pressure releasing structure 520 included in this component respectively undertake the functions of pressure increase and release, forming a bidirectional regulation capability. This adjustable isostatic pressure environment can adapt to the pressure demand changes of the solid-state cell 210 under different charging and discharging states, solving the technical defect of traditional fixed pressure systems that cannot dynamically respond to changes in the working state of the cell 210.

[0128] refer to Figure 8 and Figure 9 In some embodiments, the pressure regulating assembly 500 may include a pressure-increasing structure 510 and a pressure-reducing structure 520.

[0129] The pressurizing structure 510 is used to allow external equipment to introduce pressure-transmitting medium 400 into the sealing cavity 110 through the pressurizing structure 510. The pressurizing structure 510 is also used to increase the pressure inside the sealing cavity 110.

[0130] The pressurization structure 510 refers to a device capable of establishing an injection channel for the pressure-transmitting medium 400. Specifically, it can be implemented by connecting a fluid interface with a one-way valve to an external pressure pump. The external pressure pump drives the pressure-transmitting medium 400 to be injected into the sealed cavity 110 to achieve the pressurization function. This structure forms a positive pressure gradient by actively inputting the pressure-transmitting medium 400, ensuring that the internal pressure of the sealed cavity 110 can actively increase according to the working state of the battery cell 210.

[0131] The pressure relief structure 520 and the pressure increasing structure 510 are arranged alternately. The pressure relief structure 520 is used to allow external equipment to extract the pressure transmitting medium 400 in the sealing cavity 110 through the pressure relief structure 520. The pressure relief structure 520 is also used to reduce the pressure in the sealing cavity 110.

[0132] The pressure relief structure 520 refers to a device that can establish a discharge channel for the pressure-transmitting medium 400. Specifically, it can be implemented by connecting a fluid interface with a pressure relief valve to an external suction device. The external suction device drives the pressure-transmitting medium 400 to discharge from the sealed cavity 110 to achieve the pressure reduction function. This structure forms a negative pressure release path by reversely extracting the pressure-transmitting medium 400, avoiding pressure overload caused by thermal expansion or cyclic deformation of the battery cell 210.

[0133] The interval setting refers to the physical separation of the pressurizing structure 510 and the depressurizing structure 520 on the housing assembly 100. Specifically, it can be achieved by arranging independent interfaces on both sides of the housing or on different planes. Spatial isolation eliminates mutual interference during medium flow and ensures the controllability of fluid direction during pressure regulation.

[0134] This technical solution establishes a closed-loop pressure regulation mechanism for the sealed cavity 110 by setting up independent and spaced-apart dual-channel structures for pressurization and depressurization. The pressurization structure 510 achieves its pressurization function by injecting pressure-transmitting medium 400 through external equipment. Its technical contribution lies in establishing a positive pressure input path, enabling the sealed cavity 110 to actively increase its internal pressure according to operating conditions.

[0135] The pressure relief structure 520 achieves pressure reduction by reversely extracting the medium. Its technological contribution lies in forming a negative pressure release channel, effectively avoiding pressure overload caused by the expansion or temperature changes of the battery cell 210. The technological contribution of the two structures being spaced apart is to eliminate mutual interference during the pressure regulation process, ensure the controllability of the medium flow direction, and reduce the risk of local stress concentration through spatial separation design. The synergistic effect of the two structures enables bidirectional dynamic adjustment of the pressure in the sealed cavity 110, solving the defect of traditional single pressure regulating devices that cannot simultaneously handle pressurization and pressure relief.

[0136] refer to Figure 8 and Figure 9 In some embodiments, the battery pack may further include a detection element 530 and a control element (not shown). The detection element 530 is used to detect the pressure within the sealed cavity 110. The control element is controlled and connected to the detection element 530 to acquire the parameters acquired by the detection element 530. The control element is also controlled and connected to the pressurization structure 510 and the pressure relief structure 520, and is used to adjust the pressure within the sealed cavity 110 by controlling the pressurization structure 510 and the pressure relief structure 520.

[0137] The detection component 530 refers to a sensor used for real-time monitoring of the pressure inside the sealed cavity 110. Specifically, it can be implemented using a piezoresistive or piezoelectric pressure sensor, installed on the inner wall of the sealed cavity 110 or embedded in the surface of the cold plate assembly, to convert the pressure signal into an electrical signal and transmit it to the control component. The control component refers to a logic processing unit used to receive the detection signal and control the pressure regulating component 500. Specifically, it can be implemented using a microcontroller or a programmable logic controller (PLC). It compares the real-time pressure value with the target pressure range using a preset algorithm and generates pressurization or depressurization commands.

[0138] This technical solution constructs a closed-loop pressure control system through the linkage mechanism between the detection element 530 and the control element. The detection element 530, as a pressure sensing unit, collects the pressure parameters inside the sealed cavity 110 in real time and converts the physical quantity into a transmittable electronic signal. The control element, as a data processing hub, receives the dynamic parameters from the detection element 530, determines the deviation between the current pressure state and the target value through a preset algorithm, and then generates corresponding control commands.

[0139] At the pressure regulation execution level, the controller coordinates the pressurization structure 510 and the pressure relief structure 520: when insufficient pressure is detected, the pressurization structure 510 is triggered to replenish the pressure transmission medium 400 to increase the pressure; when the pressure exceeds the threshold, the pressure relief structure 520 is activated to discharge the medium to reduce the pressure. This automatic adjustment mechanism based on real-time feedback overcomes the technical bottleneck of traditional mechanical pressure devices' inability to respond dynamically, achieving precise maintenance of the pressure environment.

[0140] refer to Figure 10 In some embodiments, the battery pack may further include a covering layer 800 that wraps around the outer surface of the housing assembly 100. In some embodiments, the covering layer 800 may be a carbon fiber covering layer 800.

[0141] This technical solution improves the deformation resistance of the housing assembly 100 by wrapping one or more layers of the covering layer 800 on the outside of the housing assembly 100, avoids deformation of the housing assembly 100 due to large expansion force when the battery cell assembly 200 expands, and reduces the probability of separation between the top cover 140 and the tray 130.

[0142] This application embodiment also provides an electrical device, which may include an electrical appliance and the aforementioned battery pack, the battery pack being used to supply power to the electrical appliance.

[0143] This technical solution, by using the aforementioned battery pack to power the electrical device, can improve the stability of the power supply process and extend the power supply duration, thereby improving the safety and battery life of the electrical device.

[0144] In some embodiments, the electrical equipment can be a vehicle or an energy storage device. The vehicle can be a new energy vehicle, such as a pure electric vehicle (PEV / BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. The vehicle can also be any vehicle with a battery.

[0145] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0146] It should be noted that phrases such as "in particular implementation," "in some embodiments," "in this embodiment," and "exemplarily" used in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases may not necessarily refer to the same embodiment. Moreover, when describing a specific feature, structure, or characteristic in conjunction with embodiments, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0147] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0148] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0149] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such 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 this application.

Claims

1. A battery pack, characterized in that, include: The housing assembly (100) has a sealed cavity (110) inside; A battery cell assembly (200) is disposed within the sealed cavity (110), the battery cell assembly (200) comprising a plurality of battery cells (210) spaced apart along a first direction; A cooling mechanism (300) is disposed in the sealed cavity (110), and the cooling mechanism (300) is used to dissipate heat from the battery cell assembly (200); A pressure-transmitting medium (400) fills the interior of the sealed cavity (110) and is also filled in the gap between each two adjacent cells (210). The pressure-transmitting medium (400) is used to create an isostatic pressure environment within the sealed cavity (110).

2. The battery pack according to claim 1, characterized in that, The cooling mechanism (300) includes: A first cold plate assembly (310) is disposed on one side of the battery cell assembly (200) along a second direction, and the first cold plate assembly (310) is used to dissipate heat from the battery cell assembly (200). The second direction is perpendicular to the first direction.

3. The battery pack according to claim 2, characterized in that, The first cold plate assembly (310) includes: The first cold plate (311) is used to dissipate heat for the battery cell assembly (200); A first comb structure (312) is disposed between the first cold plate (311) and the battery cell group (200) along the second direction. Each two adjacent comb teeth in the first comb structure (312) are used to clamp one battery cell (210) and the two adjacent battery cells (210) are spaced apart along the first direction.

4. The battery pack according to claim 2, characterized in that, The cooling mechanism (300) also includes: A second cold plate assembly (320) is disposed on the surface of the battery cell assembly (200) facing away from the first cold plate assembly (310) along the second direction, and the second cold plate assembly (320) is used to dissipate heat for the battery cell assembly (200).

5. The battery pack according to claim 4, characterized in that, The second cold plate assembly (320) includes: The second cold plate (321) is used to dissipate heat for the battery cell assembly (200); The second comb structure (322) is disposed between the second cold plate (321) and the battery cell group (200) along the second direction. Each two adjacent comb teeth in the second comb structure (322) are used to clamp one battery cell (210) and the two adjacent battery cells (210) are spaced apart along the second direction.

6. The battery pack according to claim 1, characterized in that, The battery pack also includes a voltage regulating component (500); The pressure regulating component (500) is disposed in the housing and communicates with the sealing cavity (110). The pressure regulating component (500) adjusts the pressure in the sealing cavity (110) by acting on the pressure transmitting medium (400).

7. The battery pack according to claim 6, characterized in that, The voltage regulating assembly (500) includes: A pressurizing structure (510) is provided for allowing external devices to introduce the pressure-transmitting medium (400) into the sealed cavity (110) through the pressurizing structure (510), and the pressurizing structure (510) is also used to increase the pressure inside the sealed cavity (110); A pressure relief structure (520) is provided at an interval from the pressurization structure (510). The pressure relief structure (520) is used to allow external equipment to extract the pressure-transmitting medium (400) in the sealed cavity (110) through the pressure relief structure (520). The pressure relief structure (520) is also used to reduce the pressure in the sealed cavity (110).

8. The battery pack according to claim 7, characterized in that, Also includes: The detection element (530) is used to detect the pressure inside the sealed cavity (110); A control unit, which is controlled to the detection unit (530), is used to acquire the parameters acquired by the detection unit (530); The control element is also used for controllable connection with the pressurizing structure (510) and the depressurizing structure (520), and the control element is used to adjust the pressure in the sealing cavity (110) by controlling the pressurizing structure (510) and the depressurizing structure (520).

9. The battery pack according to claim 1, characterized in that, The pressure transmission medium (400) is hydraulic oil.

10. The battery pack according to claim 1, characterized in that, The battery pack also includes: The lead-out member (600) has one end connected to the battery cell assembly (200) inside the sealed cavity (110), and the other end passes through the housing and extends to the outside; A sealing assembly (700) is used to seal the gap between the lead-out member (600) and the housing.

11. The battery pack according to claim 10, characterized in that, The housing is provided with a first through hole (120) through which the lead-out member (600) can pass; The sealing assembly (700) includes a pressure plate (710) and a sealing ring (720); the pressure plate (710) has a second through hole, the pressure plate (710) covers the first through hole (120), and the lead-out member (600) passes through the second through hole and further through the first through hole (120); The sealing ring (720) is used to seal the joint between the pressure plate (710) and the first through hole (120).

12. The battery pack according to claim 11, characterized in that, The lead-out member (600) and the pressure plate (710) are integrally formed; The sealing assembly (700) further includes an insulating layer (730) disposed on the surface of the pressure plate (710) facing the housing, the pressure plate (710) being connected to the housing via the insulating layer (730).

13. The battery pack according to claim 1, characterized in that, The housing assembly (100) includes: A tray (130) having a receiving cavity and an opening communicating with the receiving cavity for receiving the battery cell assembly (200); The top cover (140) covers the opening and forms a sealed cavity (110) with the tray (130).

14. The battery pack according to claim 13, characterized in that, The tray (130) and the top cover (140) are connected by welding; The housing assembly (100) also includes a plurality of connectors (150) for fastening the top cover (140) and the tray (130).

15. The battery pack according to claim 1, characterized in that, The battery pack also includes a covering layer (800) that wraps around the outer surface of the housing assembly (100).

16. An electrical appliance, characterized in that, It includes an electrical device and a battery pack as claimed in any one of claims 1 to 15, the battery pack being used to supply power to the electrical device.

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