Battery device and electric device

Abstract

The invention discloses a battery device and a power utilization device. The battery device comprises a plurality of battery monomers, a heat management component, a first colloid and a second colloid, the battery cells are cylindrical, and gaps are formed between the outer peripheral surfaces of the adjacent battery cells. The thermal management component is used for adjusting the temperature of the battery cells. A part of the surface of the heat management component is attached to the peripheral surface of the battery monomer through the first colloid; the second colloid fills at least a portion of the void. Wherein the heat conductivity coefficient of the second colloid is smaller than that of the first colloid, so that the battery has relatively high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] With the development of new energy technology, the application of battery devices is more and more widely, and the battery devices have high energy density, high reliability, long service life and green environmental protection to the society, which have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery replacement stations, engineering manufacturing, intelligent instruments and other aspects, and also promote the development and research of communication terminals, medical instruments, energy development and other aspects.

[0003] In the battery device technology, how to improve the reliability of the battery device is a technical problem to be solved. SUMMARY

[0004] The embodiments of the present application provide a battery device and a power utilization device, which can effectively improve the reliability of the battery device.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which comprises a plurality of battery monomers, a thermal management component, a first glue and a second glue: the battery monomers are in a cylindrical shape, and a gap is formed between the outer circumferential surfaces of adjacent battery monomers; the thermal management component is used to adjust the temperature of the battery monomers; part of the surface of the thermal management component is attached to the outer circumferential surface of the battery monomers through the first glue; and the second glue fills at least part of the gap; wherein the thermal conductivity of the second glue is less than that of the first glue.

[0006] In the above technical solution, part of the surface of the thermal management component is attached to the outer circumferential surface of the battery monomers through the first glue, and the second glue fills at least part of the gap formed between the outer circumferential surfaces of the plurality of battery monomers, and the thermal conductivity of the second glue is less than that of the first glue. Thus, compared with the second glue, the thermal conductivity of the first glue is larger, so that the battery monomers and the thermal management component have a higher heat conduction efficiency, so as to improve the heat exchange effect and improve the reliability of the battery device. Compared with the first glue, the thermal conductivity of the second glue is smaller, so that the adjacent battery monomers have a lower heat conduction efficiency, reducing the heat conduction between the adjacent battery monomers generated by the battery monomers, thereby improving the reliability of the battery device.

[0007] In some embodiments, the thermal conductivity of the second glue is between 0.03 W / (m·K) and 0.45 W / (m·K).

[0008] In the above technical solution, the thermal conductivity of the second colloid is greater than 0.03 W / (m·K), which provides a certain level of thermal conductivity and alleviates the problem of excessively high local temperatures in individual battery cells. The thermal conductivity of the second colloid is less than 0.45 W / (m·K), meaning that the thermal conductivity of the second colloid is not too high, and the heat generated by the battery cells is less likely to be conducted between adjacent cells. Therefore, the thermal conductivity of the second colloid is between 0.03 W / (m·K) and 0.45 W / (m·K), resulting in high reliability of the battery device.

[0009] In some embodiments, the thermal conductivity of the first colloid is between 0.3 W / (m·K) and 1.5 W / (m·K).

[0010] In the above technical solution, the thermal conductivity of the first colloid is greater than 0.3 W / (m·K), resulting in a first colloid with high thermal conductivity to meet the heat exchange requirements between the battery cells and thermal management components. The thermal conductivity of the first colloid is less than 1.5 W / (m·K), preventing excessively rapid heat loss from localized areas within the battery cells and mitigating the risk of uneven temperature distribution. Therefore, the thermal conductivity of the first colloid, between 0.3 W / (m·K) and 1.5 W / (m·K), allows the battery cells to operate within a suitable temperature range, improving their cycle life and reliability.

[0011] In some embodiments, the area of ​​the outer peripheral surface of the battery cell is S1, and the coating area of ​​the first colloid on the outer peripheral surface of the battery cell is S2, satisfying that 0.2≤S1 / S2≤0.4.

[0012] In the above technical solution, 0.2≤S1 / S2 ensures that the first colloid has a large coating area on the outer peripheral surface of the battery cell, thereby providing sufficient heat exchange surface between the battery cell and the thermal management components, which can improve the heat exchange effect and enhance the reliability of the battery device.

[0013] The ratio S1 / S2≤0.4 ensures that the coating area of ​​the first colloid on the outer peripheral surface of the battery cell is not too large, thus increasing the contact area between the outer peripheral surface of the battery cell and the second colloid. This helps to increase the connection area between the second colloid and the outer peripheral surface of the battery cell, improve the connection stability of adjacent battery cells, and enhance the structural stability of the battery device.

[0014] Therefore, 0.2≤S1 / S2≤0.4 can balance the reliability of the battery device and the structural stability.

[0015] In some embodiments, the adhesive strength of the second colloid is greater than that of the first colloid.

[0016] In the above technical solution, the adhesive strength of the second colloid is greater than that of the first colloid. This greater adhesive strength of the second colloid improves the connection stability of adjacent battery cells and enhances the structural stability of the battery device. Conversely, the lower adhesive strength of the first colloid makes the thermal management components easier to disassemble, improving their maintainability.

[0017] In some embodiments, the adhesive strength of the first colloid is between 6 MPa and 10 MPa.

[0018] In the above technical solution, the adhesive strength of the first colloid is greater than 6 MPa, which is not too low and is beneficial for the integration of the thermal management component with the battery cell, thereby improving the structural stability of the battery device. Conversely, if the adhesive strength of the first colloid is less than 6 MPa, it is not too high and facilitates the disassembly of the thermal management component from the battery cell, improving its maintainability. Therefore, an adhesive strength of 6 MPa to 10 MPa for the first colloid can balance the structural stability of the battery device with the maintainability of the thermal management component.

[0019] In some embodiments, the adhesive strength of the second colloid is between 6 MPa and 15 MPa.

[0020] In the above technical solution, the adhesive strength of the second colloid is greater than 6 MPa, which is not too low, facilitating the integration of multiple battery cells together and improving the structural stability of the battery device. Conversely, if the adhesive strength of the second colloid is less than 15 MPa, it is not too high, allowing for individual battery cell disassembly and improving the maintainability of the battery cells. Therefore, an adhesive strength of the second colloid between 6 MPa and 15 MPa can balance the structural stability of the battery device and the maintainability of the battery cells.

[0021] In some embodiments, the battery device further includes a tray having a receiving cavity in which the plurality of battery cells, the thermal management component, and the second colloid are at least partially located.

[0022] In the above technical solution, at least a portion of the thermal management component, the second colloid, and multiple battery cells are housed in the receiving cavity, which facilitates the integration of battery cells and helps to improve the assembly efficiency and structural stability of the battery device.

[0023] In some embodiments, the tray includes a bottom wall and side walls surrounding the bottom wall, the side walls and the bottom wall forming the receiving cavity.

[0024] In the above technical solution, the tray includes a bottom wall and side walls surrounding the bottom wall. The side walls and the bottom wall together form a receiving cavity, which reduces the difficulty of tray manufacturing.

[0025] In some embodiments, the second colloid connects the bottom wall to the battery cell.

[0026] In the above technical solution, by connecting the bottom wall and the battery cell with the second colloid, the connection stability between the battery cell and the tray is improved, and the structural stability of the battery device is improved.

[0027] In some embodiments, the second colloid connects the bottom wall to the thermal management component.

[0028] In the above technical solution, by connecting the bottom wall and the thermal management component with the second colloid, the installation stability of the thermal management component is improved, and the structural stability of the battery device is improved.

[0029] In some embodiments, the thickness of the bottom wall is H1, satisfying 1mm≤H1≤2mm.

[0030] In the above technical solution, 1mm≤H1 ensures the first wall is not too thin, meeting the load-bearing requirements of the battery cells. H1≤2mm ensures the first wall is not too thick, which helps reduce the tray's mass and increase the proportion of battery cells per unit mass, thereby improving the energy density of the battery device. Therefore, 1mm≤H1≤2mm balances the tray's load-bearing capacity and the battery device's energy density.

[0031] In some embodiments, the battery cell is provided with a pressure relief mechanism at one end near the bottom wall; the battery device further includes a housing, the tray is housed in the housing, the housing has a first wall located on the side of the bottom wall opposite to the battery cell, and a collection cavity is formed between the first wall and the bottom wall for collecting the emissions from the battery cell when the pressure relief mechanism is actuated.

[0032] In the above technical solution, the housing has a first wall located on the side of the bottom wall away from the battery cell. A collection cavity is formed between the first wall and the bottom wall, so that the emissions from the battery cell can enter the collection cavity. The emissions spread to the vicinity of the adjacent battery cells in small amounts or not at all, which reduces the impact of the emissions from the thermal runaway battery cell on the adjacent battery cells, improves the thermoelectric separation effect, and improves the reliability of the battery device.

[0033] In some embodiments, the bottom wall is provided with a first through hole corresponding to the pressure relief mechanism, and the first through hole communicates with the collection chamber.

[0034] In the above technical solution, the first through hole is connected to the collection chamber, so that the emissions can enter the collection chamber to a greater extent.

[0035] In some embodiments, the diameter of the battery cell is D1, and the diameter of the first through hole is D2, satisfying that 10mm≤D1-D2≤14mm.

[0036] In the above technical solution, with 10mm ≤ D1-D2, the diameter difference between the battery cell and the first through hole is not too small. That is, compared to the diameter of the battery cell, the diameter of the first through hole is not too large, resulting in a larger contact area between the battery cell and the first wall. The first through hole has a lower impact on the installation stability of the battery cell and is less likely to cause problems. With D1-D2 ≤ 14mm, the diameter difference between the battery cell and the first through hole is also not too large. That is, compared to the diameter of the battery cell, the diameter of the first through hole is not too small, making it easier for emissions from the battery cell to enter the collection chamber through the first through hole. Therefore, with 10mm ≤ D1-D2 ≤ 14mm, the first through hole has a lower impact on the installation stability of the battery cell, and emissions are more likely to enter the collection chamber through the first through hole.

[0037] In some embodiments, a support member is provided between the first wall and the bottom wall, and the tray is supported on the first wall by the support member.

[0038] In the above technical solution, on the one hand, the support component can support the tray and reduce the risk of tray deformation; on the other hand, the support component reserves space for the collection cavity.

[0039] In some embodiments, the support member is integrally formed with the bottom wall.

[0040] In the above technical solution, the support component and the bottom wall are integrally formed, the connection between the support component and the bottom wall is more stable, and the support component and the bottom wall are formed in one processing step, which improves production efficiency.

[0041] In some embodiments, the battery device further includes a heat insulation element, at least a portion of which is disposed between the battery cell and the bottom wall, the heat insulation element covering at least a portion of the first through-hole, the heat insulation element being configured to be ruptured by the discharge of the battery cell when the battery cell is actuated, so that the discharge enters the collection chamber.

[0042] In the above technical solution, at least a portion of the heat insulation component is disposed between the battery cell and the bottom wall, which can reduce the heat conducted from the discharge in the collection chamber to the battery cell through the bottom wall. The heat insulation component covers at least a portion of the first through hole, and is configured to be ruptured by the discharge from the battery cell when the battery cell is actuated, allowing the discharge to enter the collection chamber. In this way, the high-temperature and high-pressure discharge released from the pressure relief mechanism can break through the heat insulation component and enter the collection chamber, while the temperature and pressure of the discharge entering the collection chamber are alleviated, making it less likely for it to reverse through the first through hole and break through the heat insulation component, affecting other battery cells.

[0043] In some embodiments, the heat insulation member includes a body and a protrusion, the body being at least partially disposed between the battery cell and the bottom wall, the protrusion protruding from the body in a direction away from the battery cell, the protrusion being located within the first through hole, and a cavity being formed between the protrusion and the pressure relief mechanism.

[0044] In the above technical solution, the heat insulation component includes a body and a protrusion. By having the body at least partially disposed between the battery cell and the bottom wall, heat conduction between the battery cell and the bottom wall can be reduced. By having the protrusion protrude from the body in a direction away from the battery cell, and the protrusion located within the first through hole, a cavity is formed between the protrusion and the pressure relief mechanism. This reduces the blockage of the pressure relief mechanism caused by the heat insulation component, allowing the exhaust material to be discharged from the battery cell to a greater extent, enter the cavity, and then break through the heat insulation component to enter the collection chamber.

[0045] In some embodiments, the battery device further includes a blocking member, at least partially located between the bottom wall and the battery cell, the blocking member being disposed around the first through-hole, and the second colloid being located outside the blocking member.

[0046] In the above technical solution, by setting the blocking member around the first through hole, the second colloid is blocked on the outside of the second colloid, so that the second colloid is not easy to overflow into the first through hole and affect the pressure relief mechanism to release the discharge.

[0047] In some embodiments, the housing further includes a frame surrounding the first wall; the tray further includes a flange disposed at one end of the side wall away from the bottom wall, the flange being connected to the frame.

[0048] In the above technical solution, the flange is connected to the frame, which can improve the connection stability between the box and the pallet and improve the assembly stability of the pallet in the box.

[0049] In some embodiments, the thickness of the flange portion along the axial direction of the battery cell is greater than the thickness of the bottom wall.

[0050] In the above technical solution, the thickness of the flange is greater than the thickness of the bottom wall. This results in a smaller bottom wall thickness compared to the flange, which helps reduce the tray's mass, increase the proportion of individual battery cells per unit mass, and improve the energy density of the battery device. The larger flange thickness compared to the bottom wall gives the flange higher structural strength, thus ensuring greater connection stability between the tray and the housing.

[0051] In some embodiments, the thickness of the flange portion is H2, satisfying 2mm≤H2≤5mm.

[0052] In the above technical solution, with 2mm ≤ H2, the flange thickness is not too small, resulting in high structural strength and stable connection between the tray and the housing. With H2 ≤ 5mm, the flange thickness is not too large, which helps reduce the tray weight, increase the proportion of individual battery cells per unit mass, and improve the energy density of the battery device. Therefore, 2mm ≤ H2 ≤ 5mm balances both the energy density of the battery device and the connection stability between the tray and the housing.

[0053] In some embodiments, the filling thickness of the second colloid along the axial direction of the battery cell is H3, satisfying 5mm≤H3≤10mm.

[0054] In the above technical solution, with 5mm ≤ H3, the filling thickness of the second colloid is not too small, resulting in high connection stability between multiple battery cells, improving the integration of battery cells, and enhancing the structural stability of the battery device. With H3 ≤ 10mm, the filling thickness of the second colloid is not too small, which helps to reduce the total mass of the second colloid, increase the proportion of battery cells per unit mass, and improve the energy density of the battery device. Therefore, 5mm ≤ H3 ≤ 10mm can balance the connection stability between multiple battery cells and the energy density of the battery device.

[0055] Secondly, embodiments of this application provide an electrical device, which includes the aforementioned battery device, and the battery device is used to supply power to the electrical device. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0058] Figure 2 This is an exploded view of a battery device according to some embodiments of this application;

[0059] Figure 3 This is an exploded view of a battery cell according to some embodiments of this application;

[0060] Figure 4 This is an assembly diagram of the tray, battery cell, and thermal management component according to some embodiments of this application;

[0061] Figure 5 Exploded schematic diagrams of the tray, battery cell, and thermal management component of some embodiments of this application;

[0062] Figure 6 A schematic diagram of the structure of the tray, battery cell, and thermal management components from one perspective;

[0063] Figure 7 This is a cross-sectional view of a battery device according to some embodiments of this application;

[0064] Figure 8 for Figure 7 Enlarged view of section A;

[0065] Figure 9 This is a schematic diagram of the tray from one perspective of some embodiments of this application;

[0066] Figure 10 This is a structural schematic diagram of the tray from another perspective of some embodiments of this application;

[0067] Figure 11 This is a schematic diagram of the structure of the heat insulation component according to some embodiments of this application.

[0068] icon:

[0069] 100-Battery assembly; 10-Battery cell; 11-End cap; 12-Electrode assembly; 13-Housing; 14-Pressure relief mechanism; 20-Box; 21-First box; 22-Second box; 23-First wall; 24-Frame; 31-First colloid; 32-Second colloid; 40-Blocking element; 50-Tray; 51-Bottom wall; 511-First through hole; 52-Side wall; 53-Flange; 54-Receiving cavity; 60-Collection cavity; 70-Supporting element; 80-Heat insulation element; 81-Body; 82-Protrusion; 83-Cavity; 84-Recess; D-Gap; 90-Thermal management component; 1000-Vehicle; 200-Motor; 300-Controller; Y-First direction; Z-Axis of battery cell; X-Second direction.

[0070] The accompanying drawings are not drawn to scale. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0072] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0073] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0076] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0077] In this application, "multiple" means two or more (including two).

[0078] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0079] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0080] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0081] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0082] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0083] Inorganic solid electrolyte fillers are added to solid electrolytes to form solid electrolytes.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0085] In some implementations, the electrode assembly is a stacked structure.

[0086] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0091] In some implementations, the electrode assembly may be cylindrical in shape.

[0092] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0094] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0095] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0096] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0097] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0098] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0099] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0100] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0101] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0102] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0103] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0104] A pressure relief mechanism is a component or part that is activated when the internal pressure or temperature of a battery cell reaches a predetermined threshold to release the internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell. Pressure relief mechanisms can take the form of explosion-proof valves, explosion-proof discs, gas valves, pressure relief valves, or safety valves, and can specifically employ pressure-sensitive or temperature-sensitive components or structures. That is, when the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism actuates or a weak structure within the mechanism is damaged, thereby creating an opening or channel for the release of internal pressure or temperature.

[0105] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to, at least a portion of the mechanism rupturing, breaking, tearing, or opening. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0106] The emissions from the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0107] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0108] The application of colloids in battery technology is widespread. For example, thermal management components are bonded to the outer circumference of cylindrical battery cells using colloids, and battery cells are connected to each other using colloids. If the same colloid is used, a high thermal conductivity of the colloid will cause heat to be transferred between adjacent battery cells, leading to a decrease in the reliability of the battery device. Conversely, a low thermal conductivity of the colloid will hinder the conduction of heat between the battery cells and the thermal management components, resulting in a decrease in the reliability of the battery device.

[0109] In view of this, to address the problem of reduced battery device reliability caused by the use of colloids, embodiments of this application provide a battery device in which a portion of the surface of a thermal management component is bonded to the outer peripheral surface of a battery cell via a first colloid, and a second colloid fills at least a portion of the gaps. The thermal conductivity of the second colloid is lower than that of the first colloid. Thus, compared to the second colloid, the first colloid has a higher thermal conductivity, resulting in higher heat transfer efficiency between the battery cell and the thermal management component, thereby improving heat exchange and battery device reliability. Compared to the first colloid, the second colloid has a lower thermal conductivity, resulting in lower heat transfer efficiency between adjacent battery cells, reducing the heat generated by the battery cells from being conducted between adjacent cells, thereby improving battery device reliability.

[0110] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0111] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0112] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0113] The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0114] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0115] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 may include a housing 20 and a battery cell 10, with the housing 20 used to house the battery cell 10.

[0116] The housing 20 has an enclosed space inside for accommodating the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 21 and a second housing 22, which are interlocked. The first housing 21 and the second housing 22 can have various shapes, such as cuboids or cylinders. The first housing 21 can be a hollow structure open on one side, and the second housing 22 can also be a hollow structure open on one side. The open side of the second housing 22 interlocks with the open side of the first housing 21, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 21 can be a hollow structure open on one side, and the second housing 22 can be a plate-like structure, with the second housing 22 interlocked with the open side of the first housing 21, thus forming a housing 20 with an accommodating space.

[0117] In the battery device 100, there can be multiple battery cells 10. These multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the whole assembly of all battery cells 10 is housed within the housing 20.

[0118] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery cells 10 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 10. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0119] In some embodiments, the battery device 100 may further include a tray (mentioned below) in which the battery cells 10 are housed to improve the integration of the battery cells 10.

[0120] Please refer to Figure 3 , Figure 3 The diagram shows an exploded view of a battery cell 10 according to some embodiments of this application. The battery cell 10 may include a housing 13, an electrode assembly 12, an end cap 11, a pressure relief mechanism 14, and other functional components.

[0121] The housing 13 is a component used to house the electrode assembly 12. The housing 13 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both ends. The housing 13 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The housing 13 is cylindrical, meaning it is cylindrical or approximately cylindrical in shape.

[0122] End cap 11 is a component that closes onto the opening of housing 13 to isolate the internal environment of battery cell 10 from the external environment. End cap 11 closes onto the opening of housing 13, and end cap 11 and housing 13 together define a sealed space for accommodating electrode assembly 12, electrolyte, and other functional components. The shape of end cap 11 can be adapted to the shape of housing 13. For example, if housing 13 is a cuboid structure, end cap 11 can be a rectangular plate structure adapted to housing 13; or if housing 13 is a cylindrical structure, end cap 11 can be a circular plate structure adapted to housing 13. The material of end cap 11 can also be various. For example, end cap 11 can be made of metal, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of end cap 11 can be the same as or different from the material of housing 13.

[0123] In the battery cell 10, there can be one or two end caps 11. If the housing 13 is a hollow structure with an opening at one end, one end cap 11 is provided accordingly; if the housing 13 is a hollow structure with openings at both ends, two end caps 11 are provided accordingly, and the two end caps 11 respectively cover the two openings of the housing 13.

[0124] This application provides a battery device 100, which can improve the reliability of the battery device 100. The specific structure of the battery device 100 will be described in detail below with reference to the accompanying drawings.

[0125] Figure 4 This is an assembly diagram of the tray 50, battery cell 10, and thermal management component 90 according to some embodiments of this application; Figure 5 Exploded schematic diagrams of the tray 50, battery cell 10, and thermal management component 90 in some embodiments of this application; Figure 6 Exploded schematic diagrams of the tray 50, battery cell 10, and thermal management component 90 in some embodiments of this application; Figure 7 This is a cross-sectional view of a battery device 100 according to some embodiments of this application; Figure 8 for Figure 7 Enlarged view of section A;

[0126] Reference Figure 4 to Figure 8 This application provides a battery device 100, which includes a plurality of battery cells 10, a thermal management component 90, a first colloid 31, and a second colloid 32. The battery cells 10 are cylindrical, and gaps D are formed between the outer peripheral surfaces of adjacent battery cells 10. The thermal management component 90 is used to regulate the temperature of the battery cells 10. A portion of the surface of the thermal management component 90 is bonded to the outer peripheral surface of the battery cells 10 via the first colloid 31; the second colloid 32 fills at least a portion of the gaps D. The thermal conductivity of the second colloid 32 is less than that of the first colloid 31.

[0127] The battery cell 10 is cylindrical, which can be understood as the outer peripheral surface of the battery cell 10 being a perfect cylinder or approximately a perfect cylinder. In embodiments where the outer casing of the battery cell 10 includes a housing 13 and an end cap 11, the outer peripheral surface of the battery cell 10 can be understood as the outer surface of the housing of the battery cell 10. The end cap 11 can be of other shapes, as long as it can be assembled with the housing.

[0128] It should be understood that the battery cell 10 is cylindrical, and its outer peripheral surface is curved. Adjacent battery cells 10 cannot be brought into direct contact surface-to-surface. Therefore, when multiple battery cells 10 are stacked together, gaps D exist between adjacent battery cells 10. Adjacent battery cells 10 may or may not contact each other; that is, there is a certain distance between adjacent battery cells 10. When adjacent battery cells 10 are in contact, the gap D between the outer peripheral surfaces of the multiple battery cells 10 is minimized. When there is a distance between adjacent battery cells 10, the gap D between the outer peripheral surfaces of the multiple battery cells 10 increases.

[0129] The thermal management component 90 is a component used to contain a heat exchange medium to regulate the temperature of multiple battery cells 10. Understandably, the thermal management component 90 has internal channels or spaces to contain the heat exchange medium. This heat exchange medium can be a liquid or a gas, and temperature regulation refers to heating or cooling the multiple battery cells 10. When cooling or lowering the temperature of the battery cells 10, the thermal management component 90 is used to contain a cooling fluid to lower the temperature of the multiple battery cells 10. In this case, the thermal management component 90 can also be called a cooling component, a cooling system, or a cooling plate, etc., and the fluid it contains can also be called a cooling medium or cooling fluid, more specifically, a coolant or a cooling gas. Alternatively, the thermal management component 90 can also be used to heat the multiple battery cells 10 to raise their temperature. Optionally, the fluid can be circulating to achieve better temperature regulation. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0130] Multiple battery cells 10 may include multiple battery modules, and each battery module includes multiple battery cells 10 arranged along a first direction Y. For example... Figure 6 As shown, a row of battery cells 10 arranged along the first direction Y constitutes a battery module. The battery module is located on the same side of the thermal management component 90. The thermal management component 90 extends in a Y-shape along the first direction. Two battery modules can be respectively set on both sides of the thermal management component 90. The two battery modules share one thermal management component 90. The two battery modules can be staggered along the first direction Y.

[0131] A portion of the surface of the thermal management component 90 is bonded to the outer peripheral surface of the battery cell 10 via a first colloid 31 (not shown in the figure). The large surface of the thermal management component 90 can be constructed with multiple curved surfaces adapted to the outer peripheral surface of the battery cell 10, and these curved surfaces are bonded to the outer peripheral surface of the battery cell 10 via the first colloid 31.

[0132] The first colloid 31 is an adhesive material used to bond the thermal management component 90 to the outer peripheral surface of the battery cell 10. The first colloid 31 can be applied to the surface of the thermal management component 90 first, and then the battery cell 10 can be bonded to the first colloid 31. To reduce the amount of the first colloid 31 used, it can be applied only to the outer periphery where the thermal management component 90 and the battery cell 10 bond, and not applied to other locations on the thermal management component 90.

[0133] The first colloid 31 includes, but is not limited to, double-sided tape, structural adhesive, thermally conductive adhesive, etc.

[0134] The second colloid 32 fills at least a portion of the void D. The second colloid 32 is an adhesive material that fills the void, thereby connecting adjacent battery cells 10 together and integrating multiple battery cells 10. The second colloid 32 may fill part or all of the void D.

[0135] The second colloid 32 includes, but is not limited to, potting compounds and structural adhesives.

[0136] The thermal conductivity of the second colloid 32 is less than that of the first colloid 31, meaning that the second colloid 32 has a larger thermal conductivity and thus higher thermal conductivity, while the first colloid 31 has a smaller thermal conductivity and thus lower thermal conductivity.

[0137] In this embodiment, a portion of the surface of the thermal management component 90 is bonded to the outer peripheral surface of the battery cell 10 via a first colloid 31. A second colloid 32 fills at least a portion of the gaps D formed between the outer peripheral surfaces of multiple battery cells 10. The thermal conductivity of the second colloid 32 is less than that of the first colloid 31. Thus, compared to the second colloid 32, the first colloid 31 has a higher thermal conductivity, resulting in higher thermal conductivity between the battery cell 10 and the thermal management component 90, thereby improving heat exchange and increasing the reliability of the battery device 100. Compared to the first colloid 31, the second colloid 32 has a lower thermal conductivity, resulting in lower thermal conductivity between adjacent battery cells 10, reducing the heat generated by the battery cells 10 from being conducted between adjacent battery cells 10, thereby improving the reliability of the battery device 100.

[0138] The thermal conductivity of the first colloid 31 and the second colloid 32 can be measured by methods such as heat flow meter method and laser flash method. Alternatively, the thermal conductivity of the first colloid 31 and the second colloid 32 can be measured by TC3000 series thermal conductivity meter or other thermal conductivity analyzer.

[0139] Taking the laser scintillation method as an example, a laser is used to transiently heat the upper surfaces of the first colloid 31 sample and the second colloid 32 sample, and the temperature changes of the lower surfaces of the first colloid 31 sample and the second colloid 32 sample are measured using an infrared detector. The faster the temperature change of the lower surface of the sample, the higher the thermal conductivity; the slower the temperature change of the lower surface of the sample, the lower the thermal conductivity.

[0140] The actual measurement is of thermal diffusivity. The thermal conductivity can be calculated by comparing it with a standard sample and measuring the sample's density and specific heat capacity.

[0141] In some embodiments, the thermal conductivity of the second colloid 32 is between 0.03 W / (m·K) and 0.45 W / (m·K).

[0142] For example, the thermal conductivity of the second colloid 32 can be 0.03 W / (m·K), 0.05 W / (m·K), 0.07 W / (m·K), 0.1 W / (m·K), 0.13 W / (m·K), 0.17 W / (m·K), 0.2 W / (m·K), 0.21 W / (m·K), 0.23 W / (m·K), 0.27 W / (m·K), 0.3 W / (m·K), 0.32 W / (m·K), 0.34 W / (m·K), 0.36 W / (m·K), 0.4 W / (m·K), 0.41 W / (m·K), 0.43 W / (m·K), 0.45 W / (m·K), and any value between these values.

[0143] The thermal conductivity of the second colloid 32 is greater than 0.03 W / (m·K), which provides a certain level of thermal conductivity and helps alleviate localized overheating of the battery cell 10. The thermal conductivity of the second colloid 32 is less than 0.45 W / (m·K), meaning it is not too high, and heat generated by the battery cell 10 is less likely to be conducted between adjacent cells. Therefore, the thermal conductivity of the second colloid 32 is between 0.03 W / (m·K) and 0.45 W / (m·K), resulting in high reliability of the battery device 100.

[0144] In some embodiments, the thermal conductivity of the first colloid 31 is between 0.3 W / (m·K) and 1.5 W / (m·K).

[0145] For example, the thermal conductivity of the first colloid 31 can be 0.3 W / (m·K), 0.4 W / (m·K), 0.5 W / (m·K), 0.6 W / (m·K), 0.7 W / (m·K), 0.8 W / (m·K), 0.9 W / (m·K), 1 W / (m·K), 1.1 W / (m·K), 1.2 W / (m·K), 1.3 W / (m·K), 1.4 W / (m·K), 1.5 W / (m·K), and any value between these values.

[0146] The thermal conductivity of the first colloid 31 is greater than 0.3 W / (m·K), resulting in a first colloid 31 with high thermal conductivity to meet the heat exchange requirements between the battery cell 10 and the thermal management component 90. The thermal conductivity of the first colloid 31 is less than 1.5 W / (m·K), preventing excessively rapid heat loss from localized areas of the battery cell 10 and mitigating the risk of uneven temperature distribution within the battery cell 10. Therefore, the thermal conductivity of the first colloid 31, ranging from 0.3 W / (m·K) to 1.5 W / (m·K), allows the battery cell 10 to operate within a suitable temperature range, improving its cycle life and reliability.

[0147] In some embodiments, the area of ​​the outer peripheral surface of the battery cell 10 is S1, and the coating area of ​​the first colloid 31 on the outer peripheral surface of the battery cell 10 is S2, satisfying that 0.2≤S1 / S2≤0.4.

[0148] The area S1 of the outer periphery of the battery cell 10 can be understood as the area of ​​a large surface after the sidewall 52 of the battery cell 10 is unfolded.

[0149] The coating area S2 of the first colloid 31 on the outer peripheral surface of the battery cell 10 can be understood as the area of ​​the outer peripheral surface of the battery cell 10 occupied by the thermal management component 90 in contact with the outer peripheral surface of the battery cell 10.

[0150] For example, the value of S1 / S2 can be 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.33, 0.34, 0.36, 0.38, 0.4 and any value in between.

[0151] The value of 0.2 ≤ S1 / S2 ensures that the first colloid 31 has a large coating area on the outer peripheral surface of the battery cell 10, thereby providing sufficient heat exchange surface between the battery cell 10 and the thermal management component 90, which can improve the heat exchange effect and enhance the reliability of the battery device 100.

[0152] S1 / S2≤0.4 ensures that the coating area of ​​the first colloid 31 on the outer peripheral surface of the battery cell 10 is not too large, thus allowing the outer peripheral surface of the battery cell 10 to have a larger contact area with the second colloid 32. This helps to increase the connection area between the second colloid 32 and the outer peripheral surface of the battery cell 10, improve the connection stability of adjacent battery cells 10, and improve the structural stability of the battery device 100.

[0153] Therefore, 0.2≤S1 / S2≤0.4 can balance the reliability and structural stability of the battery device 100.

[0154] In some embodiments, the adhesive strength of the second colloid 32 is greater than the adhesive strength of the first colloid 31.

[0155] Adhesive strength refers to the mechanical strength exhibited when an adhesive bonds different components together. The components bonded by the adhesive are called adhesive parts. Here, the battery cell 10 and the thermal management component 90 can be understood as adhesive parts.

[0156] Regarding the measurement of adhesive strength: An external force can be applied to the adhesive components until they are separated or the adhesive bond fails. The greater the force required to separate the components or cause failure at the bonded point, the greater the adhesive strength; conversely, the smaller the force required, the weaker the adhesive strength.

[0157] Specifically, the specific bonding strength values ​​of the first colloid 31 and the second colloid 32 can also be measured by testing methods such as peel strength test, endurance strength test and fatigue strength test.

[0158] In this embodiment, the adhesive strength of the second colloid 32 is greater than that of the first colloid 31. Therefore, the second colloid 32 has a higher adhesive strength than the first colloid 31, which is beneficial for improving the connection stability of adjacent battery cells 10 and enhancing the structural stability of the battery device 100. Conversely, the first colloid 31 has a lower adhesive strength than the second colloid 32, making the thermal management component 90 easier to disassemble and improving its maintainability.

[0159] In some embodiments, the adhesive strength of the first colloid 31 is between 6 MPa and 10 MPa.

[0160] For example, the adhesive strength of the first colloid 31 can be 6 MPa, 6.5 MPa, 7 MPa, 7.5 MPa, 8 MPa, 8.5 MPa, 9 MPa, 9.5 MPa, 10 MPa and any value between these values.

[0161] The adhesive strength of the first colloid 31 is greater than 6 MPa, which is not too low, thus facilitating the integration of the thermal management component 90 with the battery cell 10 and improving the structural stability of the battery device 100. Conversely, if the adhesive strength of the first colloid 31 is less than 6 MPa, it facilitates the removal of the thermal management component 90 from the battery cell 10, improving its maintainability. Therefore, an adhesive strength between 6 MPa and 10 MPa for the first colloid 31 balances the structural stability of the battery device 100 with the maintainability of the thermal management component 90.

[0162] In some embodiments, the adhesive strength of the second colloid 32 is between 6 MPa and 15 MPa.

[0163] For example, the adhesive strength of the second colloid 32 can be 6 MPa, 7 MPa, 8 MPa, 9 MPa, 8 MPa, 10 MPa, 11 MPa, 12 MPa, 13 MPa, 14 MPa, 15 MPa and any value between these values.

[0164] The adhesive strength of the second colloid 32 is greater than 6 MPa, which is not too weak, facilitating the integration of multiple battery cells 10 together and improving the structural stability of the battery device 100. Conversely, the adhesive strength of the second colloid 32 is less than 15 MPa, which is not too strong, allowing for the disassembly of individual battery cells 10 and improving their maintainability. Therefore, an adhesive strength between 6 MPa and 15 MPa for the second colloid 32 strikes a balance between the structural stability of the battery device 100 and the maintainability of the battery cells 10.

[0165] Figure 9 This is a schematic diagram of the structure of a tray 50 from one perspective, representing some embodiments of this application.

[0166] Reference Figure 4 , Figure 5 , Figure 6 and Figure 9 In some embodiments, the battery device 100 further includes a tray 50 having a receiving cavity 54, wherein a plurality of battery cells 10, a thermal management component 90, and a second colloid 32 are at least partially located in the receiving cavity 54.

[0167] The tray 50 can be constructed as a circle, rectangle, etc.

[0168] In related technologies, battery cells 10 are fixed by structures such as end plates and side plates to integrate multiple battery cells 10. The battery device 100 with this structure is complex and has low assembly efficiency.

[0169] Compared to the above method, at least a portion of the thermal management component 90, the second colloid 32, and the plurality of battery cells 10 are housed in the receiving cavity 54, which facilitates the integration of the plurality of battery cells 10 and helps to improve the assembly efficiency and structural stability of the battery device 100.

[0170] Reference Figure 9 In some embodiments, the tray 50 includes a bottom wall 51 and a side wall 52 surrounding the bottom wall 51, the side wall 52 and the bottom wall 51 forming a receiving cavity 54.

[0171] The second colloid 32 can be filled into the cavity 54. The second colloid 32 is spread flat from the bottom wall 51 upwards, and the flow shape of the second colloid 32 is used to fill part or all of the gap D.

[0172] The tray 50 includes a bottom wall 51 and side walls 52 surrounding the bottom wall 51. The side walls 52 and the bottom wall 51 together form a receiving cavity 54. This structure reduces the difficulty of manufacturing the tray 50.

[0173] Reference Figure 8 In some embodiments, the second colloid 32 connects the bottom wall 51 to the battery cell 10.

[0174] In this embodiment, by connecting the second colloid 32 to the bottom wall 51 and the battery cell 10, the connection stability between the battery cell 10 and the tray 50 is improved, and the structural stability of the battery device 100 is improved.

[0175] Reference Figure 8 In some embodiments, the second colloid 32 connects the bottom wall 51 to the thermal management component 90.

[0176] In this embodiment, by connecting the second colloid 32 to the bottom wall 51 and the thermal management component 90, the installation stability of the thermal management component 90 is improved, and the structural stability of the battery device 100 is improved.

[0177] Reference Figure 8 In some embodiments, the thickness of the bottom wall 51 is H1, which satisfies 1mm≤H1≤2mm.

[0178] For example, H1 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm and any value between these.

[0179] If 1mm ≤ H1, the first wall 23 will not be too thin, which can meet the load-bearing requirements of the battery cell 10. If H1 ≤ 2mm, the first wall 23 will not be too thick, which is beneficial for reducing the mass of the tray 50 and increasing the proportion of battery cells 10 per unit mass, thereby increasing the energy density of the battery device 100. Therefore, 1mm ≤ H1 ≤ 2mm can balance the load-bearing capacity of the tray 50 and the energy density of the battery device 100.

[0180] Reference Figure 3 and Figure 7 In some embodiments, a pressure relief mechanism 14 is provided at one end of the battery cell 10 near the bottom wall 51. The battery device 100 also includes a housing 20, in which a tray 50 is housed. The housing 20 has a first wall 23 located on the side of the bottom wall 51 opposite to the battery cell 10. A collection cavity 60 is formed between the first wall 23 and the bottom wall 51. The collection cavity 60 is used to collect the emissions from the battery cell 10 when the pressure relief mechanism 14 is actuated.

[0181] A through hole can be provided in the first wall 23 to allow the discharge to enter the collection chamber 60. Alternatively, a weak section can be provided in the first wall 23, configured to be perforated by the discharge to allow it to enter the collection chamber 60. This weak section can be formed by creating grooves in the first wall 23, or by locally thinning the thickness of the first wall 23.

[0182] In this embodiment, the housing 20 has a first wall 23, which is located on the side of the bottom wall 51 away from the battery cell 10. A collection cavity 60 is formed between the first wall 23 and the bottom wall 51, so that the emissions from the battery cell 10 can enter the collection cavity 60. The emissions spread to the vicinity of the adjacent battery cells 10 in a small amount or not at all, which reduces the impact of the emissions from the thermal runaway battery cell 10 on the adjacent battery cells 10, improves the thermoelectric separation effect, and improves the reliability of the battery device 100.

[0183] In some embodiments, the bottom wall 51 is provided with a first through hole 511 corresponding to the pressure relief mechanism 14, and the first through hole 511 communicates with the collection chamber 60.

[0184] The first through hole 511 can be constructed as a round hole, a rectangular hole, etc.

[0185] Multiple first through holes 511 can be provided, and each of the multiple first through holes 511 corresponds to a single battery cell 10.

[0186] In this embodiment, the first through hole 511 is connected to the collection chamber 60, so that the discharge can enter the collection chamber 60 to a greater extent.

[0187] In some embodiments, the diameter of the battery cell 10 is D1, and the diameter of the first through hole 511 is D2, satisfying that 10mm≤D1-D2≤14mm.

[0188] D1-D2 is the diameter difference between the battery cell 10 and the first through hole 511.

[0189] For example, D1-D2 can be 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, or 14mm.

[0190] If 10mm ≤ D1-D2, the diameter difference between the battery cell 10 and the first through hole 511 will not be too small. That is, compared to the diameter of the battery cell 10, the diameter of the first through hole 511 will not be too large, resulting in a larger contact area between the battery cell 10 and the first wall 23. Therefore, the first through hole 511 has a lower impact on the installation stability of the battery cell 10 and is less likely to cause problems. If D1-D2 ≤ 14mm, the diameter difference between the battery cell 10 and the first through hole 511 will not be too large. That is, compared to the diameter of the battery cell 10, the diameter of the first through hole 511 will not be too small, making it easier for emissions from the battery cell 10 to enter the collection chamber 60 through the first through hole 511. Therefore, if 10mm ≤ D1-D2 ≤ 14mm, the first through hole 511 has a lower impact on the installation stability of the battery cell 10, and emissions are more likely to enter the collection chamber 60 through the first through hole 511.

[0191] Figure 10 This is a structural schematic diagram of the tray 50 from another perspective, representing some embodiments of this application.

[0192] Reference Figure 10 and Figure 8 In some embodiments, a support member 70 is provided between the first wall 23 and the bottom wall 51, and the tray 50 is supported on the first wall 23 by the support member 70.

[0193] In some embodiments, multiple support members 70 are provided, and the multiple support members 70 are spaced apart.

[0194] The support member 70 and the first wall 23 can be made of the same or different materials. The support member 70 and the first wall 23 can be integrally formed or separately manufactured and then connected.

[0195] In some embodiments, the support 70 may abut against the first wall 23.

[0196] The support member 70 can support the tray 50 and reduce the risk of deformation of the tray 50; on the other hand, the support member 70 reserves space for the collection cavity 60.

[0197] In some embodiments, the support member 70 and the bottom wall 51 are integrally formed. The integral forming method includes, but is not limited to, injection molding, die casting, extrusion and other processes.

[0198] The support component 70 and the bottom wall 51 are integrally formed, which improves the connection stability between the support component 70 and the bottom wall 51. The support component 70 and the bottom wall 51 are formed in one processing step, which improves production efficiency.

[0199] Figure 11 This is a schematic diagram of the structure of the heat insulation component 80 in some embodiments of this application.

[0200] Reference Figure 11 , Figure 8 and Figure 5 In some embodiments, the battery device 100 further includes a heat insulation element 80, at least a portion of which is disposed between the battery cell 10 and the bottom wall 51. The heat insulation element 80 covers at least a portion of the first through hole 511. The heat insulation element 80 is configured to be ruptured by the discharge of the battery cell 10 when the battery cell 10 is actuated, so that the discharge enters the collection chamber 60.

[0201] Insulation component 80 is a component used to reduce heat transfer.

[0202] In some embodiments, the material of the thermal insulation element 80 includes mica. Optionally, the thermal insulation element 80 is mica paper or mica board.

[0203] The heat insulation element 80 covers at least a portion of the first through hole 511, that is, along the thickness direction of the bottom wall 51, the projection of the heat insulation element 80 covers a portion of the first through hole 511 or the projection of the heat insulation element 80 completely covers the first through hole 511.

[0204] At least a portion of the heat insulation element 80 is disposed between the battery cell 10 and the bottom wall 51, which can reduce the heat conducted from the discharge of the collection chamber 60 to the battery cell 10 through the bottom wall 51. The heat insulation element 80 covers at least a portion of the first through hole 511. The heat insulation element 80 is configured to be ruptured by the discharge of the battery cell 10 when the battery cell 10 is actuated, so that the discharge enters the collection chamber 60. In this way, the high-temperature and high-pressure discharge released from the pressure relief mechanism 14 can break through the heat insulation element 80 and enter the collection chamber 60. The temperature and pressure of the discharge entering the collection chamber 60 are relieved, and it is not easy for the discharge to break through the heat insulation element 80 in the opposite direction through the first through hole 511 and affect other battery cells 10.

[0205] Reference Figure 8 and Figure 11In some embodiments, the heat insulation member 80 includes a body 81 and a protrusion 82. The body 81 is at least partially disposed between the battery cell 10 and the bottom wall 51. The protrusion 82 protrudes from the body 81 in a direction away from the battery cell 10. The protrusion 82 is located in the first through hole 511, and a cavity 83 is formed between the protrusion 82 and the pressure relief mechanism 14.

[0206] In some embodiments, the protrusion 82 is constructed as a cylinder.

[0207] In some embodiments, the heat insulation member 80 has a recess 84 corresponding to the protrusion 82 on the side facing the battery cell 10. In some embodiments, the heat insulation member 80 may also be provided with a second through hole corresponding to the first through hole 511, the second through hole penetrating the recess 84 and the protrusion 82.

[0208] The heat insulation component 80 includes a body 81 and a protrusion 82. By having the body 81 at least partially disposed between the battery cell 10 and the bottom wall 51, heat conduction between the battery cell 10 and the bottom wall 51 can be reduced. By having the protrusion 82 protrude from the body 81 in a direction away from the battery cell 10, and the protrusion 82 is located within the first through hole 511, a cavity 83 is formed between the protrusion 82 and the pressure relief mechanism 14. This reduces the blockage of the pressure relief mechanism 14 caused by the heat insulation component 80, thereby allowing the exhaust material to be discharged from the battery cell 10 to a greater extent, enter the cavity 83, and then break through the heat insulation component 80 into the collection chamber 60.

[0209] Reference Figure 8 In some embodiments, the battery device 100 further includes a blocking member 40, at least partially located between the bottom wall 51 and the battery cell 10, the blocking member 40 being disposed around the first through hole 511, and the second colloid 32 being located outside the blocking member 40.

[0210] The blocking member 40 is a blocking component used to prevent the second colloid 32 from overflowing into the first through hole 511.

[0211] The blocking component 40 can be a sealing ring, sealing gasket, etc.

[0212] In this embodiment, by having the blocking member 40 surround the first through hole 511, the second colloid 32 is blocked on the outside of the second colloid 32, so that the second colloid 32 is not likely to overflow into the first through hole 511 and affect the pressure relief mechanism 14 to release the discharge.

[0213] Reference Figure 7 In some embodiments, the housing 20 further includes a frame 24 surrounding the first wall 23. The tray 50 also includes a flange 53 disposed at the end of the side wall 52 away from the bottom wall 51, and the flange 53 is connected to the frame 24.

[0214] The frame 24 can be understood as the side wall of the box 20.

[0215] In this embodiment, the flange 53 is connected to the frame 24, which can improve the connection stability between the box 20 and the pallet 50 and improve the assembly stability of the pallet 50 in the box 20.

[0216] In some embodiments, along the axial direction Z of the battery cell, the thickness of the flange 53 is greater than the thickness of the bottom wall 51.

[0217] In this embodiment, the thickness of the flange 53 is greater than the thickness of the bottom wall 51. This results in a smaller bottom wall 51 compared to the flange 53, which helps reduce the mass of the tray 50, increase the proportion of individual battery cells 10 per unit mass, and improve the energy density of the battery device 100. The larger thickness of the flange 53 compared to the bottom wall 51 gives it higher structural strength, thus ensuring a more stable connection between the tray 50 and the housing 20.

[0218] Reference Figure 7 In some embodiments, the thickness of the flange portion 53 is H2, satisfying 2mm≤H2≤5mm.

[0219] For example, H2 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm and any value in between.

[0220] With H2 ≤ 2mm, the thickness of flange 53 is not too small, resulting in high structural strength and ensuring high connection stability between tray 50 and housing 20. With H2 ≤ 5mm, the thickness of flange 53 is not too large, which helps reduce the mass of tray 50, increase the proportion of battery cells 10 per unit mass, and improve the energy density of battery device 100. Therefore, 2mm ≤ H2 ≤ 5mm can balance the energy density of battery device 100 and the connection stability between tray 50 and housing 20.

[0221] Reference Figure 8 In some embodiments, the filling thickness of the second colloid 32 along the axial direction Z of the battery cell is H3, satisfying 5mm≤H3≤10mm.

[0222] For example, H3 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm and any value in between.

[0223] With H3 ≤ 5mm, the filling thickness of the second colloid 32 is not too small, ensuring high connection stability between multiple battery cells 10, improving the integration of battery cells 10, and enhancing the structural stability of the battery device 100. With H3 ≤ 10mm, the filling thickness of the second colloid 32 is not too small, which helps reduce the total mass of the second colloid 32, increases the proportion of battery cells 10 per unit mass, and improves the energy density of the battery device 100. Therefore, 5mm ≤ H3 ≤ 10mm can balance the connection stability between multiple battery cells 10 and the energy density of the battery device 100.

[0224] In some embodiments, the second colloid 32 is filled from the bottom wall 51 of the tray 50, the bottom wall 51 having a first surface facing the second colloid 32, the second colloid 32 having a second surface away from the bottom wall 51, and the distance between the first surface and the second surface can be understood as a filling thickness of H3.

[0225] This application embodiment also provides an electrical device, which includes the battery device 100 described above, and the battery device 100 is used to supply power to the electrical device.

[0226] Reference Figure 3 to Figure 11This application also provides a battery device 100, which includes a housing 20, a tray 50, a plurality of battery cells 10, a thermal management component 90, a support member 70, a heat insulation member 80, and a second colloid 32. The tray 50 is housed within the housing 20 and includes a bottom wall 51, side walls 52 surrounding the bottom wall 51, and a flange 53. The side walls 52 and the bottom wall 51 together form a receiving cavity 54. At least a portion of the plurality of battery cells 10 and the thermal management component 90 are located in the receiving cavity 54. The flange 53 is located at the end of the side wall 52 away from the bottom wall 51 and is connected to the housing 20. Along the axial direction Z of the battery cells, the thickness of the flange 53 is greater than the thickness of the bottom wall 51. The battery cells 10 are cylindrical, and gaps D are formed between the outer peripheral surfaces of adjacent battery cells 10. The thermal management component 90 is used to regulate the temperature of the battery cells 10. A portion of the surface of the thermal management component 90 is bonded to the outer peripheral surface of the battery cell 10 via a first colloid 31. A second colloid 32 fills at least a portion of the void D and is located within the receiving cavity 54. The thermal conductivity of the second colloid 32 is less than that of the first colloid 31. The adhesive strength of the second colloid 32 is greater than that of the first colloid 31. The second colloid 32 is a structural adhesive, and the first colloid 31 is a thermally conductive adhesive. Multiple battery cells 10 may include multiple battery modules, each battery module including multiple battery cells 10 arranged along a first direction Y. A row of battery cells 10 arranged along the first direction Y constitutes a battery module, which is located on the same side of the thermal management component 90. The thermal management component 90 extends in an S-shape along the first direction Y. Two battery modules are respectively disposed on opposite sides of the thermal management component 90, sharing one thermal management component 90, and are staggered along the first direction Y. Two battery modules and a thermal management component 90 form a battery module, and multiple battery modules are arranged along the second direction X. A second colloid 32 is filled starting from the bottom wall 51 to connect the bottom wall 51 to the battery cell 10 and the thermal management component 90. Along the axial direction Z of the battery cell, the filling thickness of the second colloid 32 is between 5mm and 10mm, and the thickness of the bottom wall 51 is between 1mm and 2mm. Because the second colloid 32 fills from the bottom wall 51, multiple battery cells 10, the bottom wall 51, and the thermal management component 90 are integrated together, resulting in higher structural stability. This reduces the structural strength requirements of the bottom wall 51, allowing for a reduction in its thickness and thus reducing the mass of the tray 50. A pressure relief mechanism 14 is provided at the end of the battery cell 10 near the bottom wall 51. The housing 20 has a first wall 23 located on the side of the bottom wall 51 opposite to the battery cell 10. A collection cavity 60 is formed between the first wall 23 and the bottom wall 51. The collection cavity 60 is used to collect the emissions from the battery cell 10 when the pressure relief mechanism 14 is actuated. The bottom wall 51 is provided with a first through hole 511 corresponding to the pressure relief mechanism 14, and the first through hole 511 communicates with the collection cavity 60.The diameter of the first through hole 511 is smaller than the diameter of the battery cell 10. The diameter difference between the battery cell 10 and the first through hole 511 is between 10 mm and 14 mm. At least a portion of the heat insulation member 80 is disposed between the battery cell 10 and the bottom wall 51. The heat insulation member 80 covers at least a portion of the first through hole 511. The heat insulation member 80 is configured to be ruptured by the discharge from the battery cell 10 when the battery cell 10 is actuated, allowing the discharge to enter the collection chamber 60. The heat insulation member 80 includes a body 81 and a protrusion 82. The body 81 is at least partially disposed between the battery cell 10 and the bottom wall 51. The protrusion 82 protrudes from the body 81 in a direction away from the battery cell 10. The protrusion 82 is located within the first through hole 511, and a cavity 83 is formed between the protrusion 82 and the pressure relief mechanism 14. A recess 84 corresponding to the protrusion 82 is formed on the side of the heat insulation member 80 facing the battery cell 10. The heat insulation component 80 is provided with a second through hole corresponding to the first through hole 511, and the second through hole penetrates the recess 84 and the protrusion 82. A support member 70 is provided between the first wall 23 and the bottom wall 51, and the tray 50 is supported on the first wall 23 by the support member 70. The first wall 23 and the support member 70 are integrally formed.

[0227] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0228] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized by, The battery device comprises: a plurality of battery cells, the battery cells being in a cylindrical shape, and a gap being formed between outer circumferential surfaces of adjacent battery cells; a thermal management component for adjusting a temperature of the battery cells; a first adhesive, a portion of a surface of the thermal management component being attached to the outer circumferential surfaces of the battery cells through the first adhesive; a second adhesive, at least a portion of the gap being filled by the second adhesive; wherein a thermal conductivity of the second adhesive is less than a thermal conductivity of the first adhesive.

2. The battery device according to claim 1, characterized by The thermal conductivity of the second adhesive is between 0.03 W / (m·K) and 0.45 W / (m·K).

3. The battery device of claim 1, wherein The thermal conductivity of the first adhesive is between 0.3 W / (m·K) and 1.5 W / (m·K).

4. The battery device of claim 1, wherein An area of the outer circumferential surface of the battery cell is S1, and a coated area of the first adhesive on the outer circumferential surface of the battery cell is S2, and 0.2≤S1 / S2≤0.4 is satisfied.

5. The battery device of claim 1, wherein An adhesive strength of the second adhesive is greater than an adhesive strength of the first adhesive.

6. The battery device of claim 5, wherein The adhesive strength of the first adhesive is between 6 MPa and 10 MPa.

7. The battery device of claim 5, wherein The adhesive strength of the second adhesive is between 6 MPa and 15 MPa.

8. The battery device of claim 1, wherein, The battery device further comprises: a tray, the tray being formed with a receiving cavity, and the plurality of battery cells, the thermal management component, and the second adhesive being at least partially located in the receiving cavity.

9. The battery device of claim 8, wherein, The tray comprises a bottom wall and a side wall surrounding the bottom wall, and the side wall and the bottom wall form the receiving cavity.

10. The battery device of claim 9, wherein, The second adhesive connects the bottom wall and the battery cell.

11. The battery device of claim 9, wherein, The second adhesive connects the bottom wall and the thermal management component.

12. The battery device of claim 9, wherein, A thickness of the bottom wall is H1, and 1 mm≤H1≤2 mm is satisfied.

13. The battery device according to any one of claims 9 to 12, wherein An end of the battery cell close to the bottom wall is provided with a pressure relief mechanism; and the battery device further comprises: a box, the tray being accommodated in the box, and the box having a first wall, the first wall being located on a side of the bottom wall away from the battery cell, and a collection cavity being formed between the first wall and the bottom wall, the collection cavity being used to collect emissions of the battery cell when the pressure relief mechanism is actuated.

14. The battery device of claim 13, wherein, The bottom wall is provided with a first through hole corresponding to the pressure relief mechanism, and the first through hole is in communication with the collection cavity.

15. The battery device of claim 14, wherein, A diameter of the battery cell is D1, and a diameter of the first through hole is D2, and 10 mm≤D1-D2≤14 mm is satisfied.

16. The battery device of claim 13, wherein, A support is provided between the first wall and the bottom wall, and the tray is supported on the first wall through the support.

17. The battery device of claim 16, wherein, The support is integrally formed with the bottom wall.

18. The battery device of claim 14, wherein, The battery device further comprises: a thermal insulation member, at least a portion of the thermal insulation member being arranged between the battery cell and the bottom wall, the thermal insulation member covering at least a portion of the first through hole, and the thermal insulation member being configured to be ruptured by the emissions of the battery cell when the battery cell is actuated so that the emissions enter the collection cavity.

19. The battery device of claim 18, wherein, The thermal insulation member comprises a body and a protruding portion, the body being at least partially arranged between the battery cell and the bottom wall, the protruding portion protruding from the body in a direction away from the battery cell, the protruding portion being located in the first through hole, and a cavity being formed between the protruding portion and the pressure relief mechanism.

20. The battery device of claim 14, wherein, The battery device further comprises: a blocking piece located at least partially between the bottom wall and the battery cell, the blocking piece being arranged around the first through hole, and the second adhesive being located outside the blocking piece.

21. The battery device of claim 13, wherein, The box further comprises a frame, the frame being arranged around the first wall; The tray further comprises a flange portion, the flange portion being arranged at an end of the side wall away from the bottom wall, and the flange portion being connected to the frame.

22. The battery device of claim 21, wherein, In the axial direction of the battery cell, the thickness of the flange portion is greater than the thickness of the bottom wall.

23. The battery device of claim 21, wherein, The thickness of the flange portion is H2, and 2mm≤H2≤5mm is satisfied.

24. The battery device of claim 1, wherein, In the axial direction of the battery cell, the filling thickness of the second adhesive is H3, and 5mm≤H3≤10mm is satisfied.

25. An electrical device, comprising: The battery device of any one of claims 1-24 is used to power the electrical device.

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