Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises a box body, a plurality of battery monomers and a heat exchange assembly, the box body comprises at least two limiting beams arranged in the first direction. The plurality of battery monomers are arranged between the adjacent limiting beams along the first direction, each battery monomer comprises a shell, an electrode assembly, an electrode terminal and a pressure relief mechanism, the electrode assembly is accommodated in the shell, the shell comprises a first wall positioned on one side of the electrode assembly along the second direction, the pressure relief mechanism is arranged on the first wall, and the pressure relief mechanism and the electrode terminal are arranged at an interval; the electrode terminal is arranged on the first wall, and the first direction is perpendicular to the second direction; the heat exchange assembly is arranged on the side, away from the electrode assembly, of the first wall and used for exchanging heat with the first wall, the heat exchange assembly is connected to the limiting beam, and the orthographic projection of the pressure relief mechanism and the orthographic projection of the heat exchange assembly do not overlap. According to the battery device provided by the invention, the heat exchange assembly is connected to the limiting beam, so that the deformation of the limiting beam is limited, and the structural stability of the limiting beam is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery production, and particularly to battery devices and power-consuming devices. Background Art

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the development of batteries, how to provide the reliability of battery devices is a technical problem that urgently needs to be solved in battery technology. Summary of the Utility Model

[0004] This application provides a battery device and a power-consuming device, aiming to improve the reliability of the battery device to a certain extent.

[0005] In a first aspect, this application proposes a battery device, which includes a box body, a plurality of battery cells, and a heat exchange component; the box body includes at least two limiting beams arranged along a first direction; the plurality of battery cells are arranged between adjacent limiting beams along the first direction, each battery cell includes a housing, an electrode assembly, an electrode terminal, and a pressure relief mechanism, the electrode assembly is accommodated in the housing, the housing includes a first wall located on one side of the electrode assembly along a second direction, the pressure relief mechanism is arranged on the first wall, the pressure relief mechanism is spaced from the electrode terminal, the electrode terminal is arranged on the first wall, and the first direction is perpendicular to the second direction; the heat exchange component is arranged on a side of the first wall away from the electrode assembly and is used for heat exchange with the first wall, the heat exchange component is connected to the limiting beam, and in a projection plane perpendicular to the second direction, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the heat exchange component.

[0006] For the battery device provided by this application, the heat exchange component is connected to the limiting beam. On the one hand, the limiting beam can fix the heat exchange component, and the heat exchange component has a high cooling effect, thereby reducing the accumulation of heat inside the battery device and damaging the battery; on the other hand, the heat exchange component is connected to the limiting beam. During the circulation of the battery cell, when it expands and squeezes the limiting beam, the limiting beam transmits the extrusion force to the heat exchange component, reducing the concentration of stress, restricting the deformation of the limiting beam, improving the structural stability of the limiting beam, and thus improving the service life and reliability of the battery device.

[0007] According to an embodiment of this application, the battery device further includes a connecting piece, and the heat exchange component is fixed to the limiting beam through the connecting piece.

[0008] In these optional embodiments, the heat exchange component is connected to the limiting beam through the connecting piece, which is convenient for the installation of the heat exchange component and the limiting beam.

[0009] According to an embodiment of the present application, the battery device further includes a reinforcing member, the reinforcing member is connected to the heat exchange component, and in the projection plane perpendicular to the second direction, at least part of the orthographic projection of the reinforcing member overlaps with the orthographic projection of the limiting beam.

[0010] In these alternative embodiments, the reinforcing member can enhance the structural strength of the heat exchange component. When the battery device is subjected to external forces such as vibration and impact, the reinforcing member can share part of the load borne by the heat exchange component to improve the structural stability of the heat exchange component.

[0011] According to an embodiment of the present application, a recess is provided on the surface of the heat exchange component along the second direction, and at least part of the reinforcing member is embedded in the recess.

[0012] In these alternative embodiments, the fitting of the recess and the reinforcing member results in a large contact area between the reinforcing member and the heat exchange component. Moreover, the recess can limit the reinforcing member, effectively suppressing relative displacement between the reinforcing member and the heat exchange component to improve the connection stability therebetween. In addition, the reinforcing member is embedded in the recess, making the connection between the reinforcing member and the heat exchange component more compact in space, thereby reducing the space occupied by the reinforcing member and being beneficial to improving the energy density of the battery device.

[0013] According to an embodiment of the present application, the battery device includes a plurality of reinforcing members, and at least two reinforcing members are located on opposite sides of the heat exchange component along the second direction.

[0014] In these alternative embodiments, with such an arrangement, the structural stability of the heat exchange component is effectively improved.

[0015] According to an embodiment of the present application, the heat exchange component is provided with a first mounting hole; the reinforcing member is provided with a second mounting hole; the battery device further includes a connecting member, and the connecting member passes through the first mounting hole and the second mounting hole and is fixed to the limiting beam.

[0016] In these alternative embodiments, through the cooperation of the first mounting hole and the second mounting hole with the connecting member, the connection between the reinforcing member, the heat exchange component and the limiting beam is realized, facilitating the installation and disassembly between the reinforcing member, the heat exchange component and the limiting beam, and simplifying the installation method of the heat exchange component and the limiting beam.

[0017] According to an embodiment of the present application, the battery cell includes two electrode terminals, and the pressure relief mechanism is located between the two electrode terminals; in the second direction, the projection of the heat exchange component on the first wall overlaps with the part of the first wall located between the two electrode terminals.

[0018] In these optional embodiments, during the battery charging and discharging process, current will flow into or out of the battery cell through the electrode terminals, which can easily cause local temperature rise near the electrode terminals. Therefore, in the second direction, the projection of the heat exchange component on the first wall overlaps with the portion of the first wall located between the two electrode terminals, which is beneficial to improving the defect of local temperature rise.

[0019] According to one embodiment of the present application, the heat exchange component is provided with a through hole extending along the second direction, and the projection of the pressure relief mechanism on the heat exchange component along the second direction falls into the through hole.

[0020] In these optional embodiments, such a configuration further reduces interference between the heat exchange component and the pressure relief mechanism.

[0021] According to one embodiment of the present application, in a third direction, the heat exchange assembly is located on a side of the electrode terminal away from the pressure relief mechanism, and the third direction is perpendicular to the first direction and the second direction.

[0022] In these optional embodiments, such an arrangement simplifies the installation of the heat exchange assembly and reduces the interference of the heat exchange assembly with the electrode terminals and the pressure relief mechanism.

[0023] According to one embodiment of the present application, a flow channel is provided inside the heat exchange component, and the flow channel is used to guide the flow of the heat exchange medium. The heat exchange component includes a plate body and a cover plate, the plate body is provided with a guide groove, and the cover plate is connected to the plate body and covers the guide groove to enclose and form the flow channel.

[0024] In these optional embodiments, a flow channel is provided inside the heat exchange component, and the flow channel is used to guide the flow of the heat exchange medium. The heat exchange medium flowing in the flow channel can quickly take away the heat generated by the battery cell.

[0025] According to an embodiment of the present application, the heat exchange assembly further includes a guide column, which is disposed in the guide groove, and the guide column protrudes relative to the bottom of the guide groove toward the cover plate.

[0026] In these optional embodiments, the provision of the guide column, on the one hand, can support the cover plate and increase the overall structural strength of the heat exchange assembly; on the other hand, the guide groove can be defined into a plurality of sub-grooves by the guide column, and the flow route of the heat exchange medium can be planned, which can improve the heat transfer efficiency and thus improve the cooling efficiency.

[0027] According to an embodiment of the present application, the heat exchange assembly is provided with a through hole, the through hole penetrates the plate body and the cover plate along the second direction, and the guide groove is staggered with the through hole.

[0028] According to an embodiment of the present application, the flow channel includes at least two straight segments and at least one bent segment. The straight segments extend along a first direction, the two straight segments are spaced apart along a third direction, the bent segment connects the adjacent two straight segments at the head and tail, and the third direction is perpendicular to the first direction and the second direction; the heat exchange component is provided with a through hole, and the through hole is located between the two straight segments.

[0029] In these alternative embodiments, with such an arrangement, the density of the flow channel in the region opposite to the battery cell can be further increased. Moreover, the adjacent two straight segments are connected by the bent segment, which can achieve a smooth transition between the two straight segments and is beneficial to the flow of the heat exchange medium in the heat exchange component.

[0030] According to an embodiment of the present application, the flow channel has an outlet segment and an inlet segment. One of the two straight segments communicates with the outlet segment, and the other communicates with the inlet segment, and the outlet segment and the inlet segment are located on the same side.

[0031] According to an embodiment of the present application, the first wall is the bottom wall.

[0032] In a second aspect, the present application provides an electrical device, including the battery device described above, and the battery device is used to store or provide electrical energy.

[0033] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0034] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0035] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0036] Figure 2 is an exploded view of a battery device provided by an embodiment of the present application;

[0037] Figure 3 is an exploded view of a battery device provided by another embodiment of the present application;

[0038] Figure 4 is an exploded view of a battery cell provided by an embodiment of the present application;

[0039] Figure 5 is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0040] Figure 6 is a partial schematic structural diagram of a battery device provided by an embodiment of the present application;

[0041] Figure 7 is a partial structural schematic diagram of a battery device provided by another embodiment of the present application;

[0042] Figure 8 is a partial bottom view of a battery device provided by an embodiment of the present application;

[0043] Figure 9 is Figure 8 a schematic cross-sectional view taken along the a-a direction;

[0044] Figure 10 is Figure 9 an enlarged schematic view at a;

[0045] Figure 11 is a partial bottom view of a battery device provided by another embodiment of the present application;

[0046] Figure 12 is Figure 11 a schematic cross-sectional view taken along the b-b direction;

[0047] Figure 13 is a partial right view of a battery device provided by an embodiment of the present application;

[0048] Figure 14 is Figure 13 an enlarged schematic view at b;

[0049] Figure 15 is a structural schematic diagram of a heat exchange component, a connecting member, and a reinforcing member provided by an embodiment of the present application;

[0050] Figure 16 is a structural schematic diagram of a heat exchange component provided by an embodiment of the present application;

[0051] Figure 17 is an exploded view of a heat exchange component provided by an embodiment of the present application;

[0052] Figure 18 is a structural schematic diagram of a heat exchange component, a connecting member, and a reinforcing member provided by another embodiment of the present application;

[0053] Figure 19 is a structural schematic diagram of a heat exchange component provided by another embodiment of the present application;

[0054] Figure 20 is a structural schematic diagram of a heat exchange component provided by still another embodiment of the present application;

[0055] Figure 21 is an exploded view of a heat exchange component provided by another embodiment of the present application.

[0056] The drawings are not necessarily drawn to actual scale.

[0057] Description of Reference Numerals

[0058] 1000, vehicle;

[0059] 100, battery device; 200, controller; 300, motor;

[0060] 1a, battery module; 1b, first box body; 1c, second box body;

[0061] 1, box body; 11, limiting beam;

[0062] 2, battery cell; 21, outer shell; 211, first wall; 22, electrode assembly; 23, electrode terminal; 24, pressure relief mechanism;

[0063] 3, heat exchange component; 31, recess; 32, first mounting hole; 33, through hole; 34, flow channel; 341, straight section; 342, bent section; 343, outlet section; 344, inlet section; 35, plate body; 351, diversion groove; 36, cover plate; 37, diversion column;

[0064] 4, connecting piece;

[0065] 5, reinforcing piece; 51, second mounting hole;

[0066] x, first direction; y, second direction; z, third direction. Detailed Embodiment

[0067] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0069] Reference to "embodiment" in this application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0070] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] The term "and / or" in this application is only a relationship describing the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0072] In the embodiments of this application, the same reference numerals represent the same components. For the sake of simplicity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only for illustrative purposes and should not constitute any limitation to this application.

[0073] The term "a plurality of" appearing in this application refers to two or more (including two).

[0074] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace.

[0075] A battery device generally refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity. A battery cell can be the smallest unit that makes up a battery device.

[0076] During the cycling process of the battery cell, it expands. The expanded battery cell squeezes the limiting beam, causing the limiting beam to deform, resulting in the failure of fixing the battery cell in the box. The battery cells may collide with each other, and it will also lead to a decrease in the sealing performance of the box, allowing impurities such as dust and moisture in the outside world to enter the box, corroding the battery cells, etc., reducing the reliability of the battery device. The above statements are only used to provide background technical information related to the present application and do not necessarily constitute the prior art.

[0077] In the battery device provided by the present application, the heat exchange component is connected to the limiting beam. On the one hand, the limiting beam can fix the heat exchange component, and the heat exchange component has a high cooling effect, thereby reducing the heat accumulation inside the battery device and damaging the battery. On the other hand, the heat exchange component is connected to the limiting beam. During the cycling process of the battery cell, when the battery cell expands and squeezes the limiting beam, the limiting beam transmits the squeezing force to the heat exchange component, reducing the stress concentration, restricting the deformation of the limiting beam, improving the structural stability of the limiting beam, and thus improving the service life and reliability of the battery device.

[0078] The battery device is used in products such as vehicles, airplanes, ships, electronic devices, and power tools, and can improve the reliability of these products.

[0079] The power-consuming device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and a power tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the power tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a power planer, etc.

[0080] For the convenience of description in the following embodiments, a vehicle is taken as an example of a power-consuming device in an embodiment of the present application for illustration.

[0081] See Figure 1As shown, an embodiment of the present application provides a vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. In an embodiment of the present application, the vehicle 1000 may include a motor 300, a controller 200, and a battery device 100. The controller 200 is used to control the battery device 100 to supply power to the motor 300. The motor 300 is connected to the wheels through a transmission mechanism, thereby driving the vehicle 1000 to travel. The battery device 100 can serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000. In one example, the battery device 100 can be disposed at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. In one example, the battery device 100 can serve as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000. Exemplarily, the battery device 100 can be used for the starting, navigation, and working power requirements during the operation of the vehicle 1000.

[0082] Please refer to Figure 2 , Figure 2 which is an exploded view of the battery device provided by some embodiments of the present application.

[0083] In some embodiments, the battery device 100 may include one or more battery cell assemblies for providing voltage and capacity.

[0084] The battery cell assembly may include a plurality of battery cells ( Figure 2 not shown), and the plurality of battery cells are connected in series, parallel, or in a series-parallel combination through a busbar component. Series-parallel combination means that there are both series and parallel connections among the plurality of battery cells.

[0085] The battery cell can be a secondary battery cell, which refers to a battery cell that can activate the active material and continue to be used after discharging through charging.

[0086] As an example, the battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0087] As an example, the battery cell can be a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc.

[0088] In some embodiments, a battery cell assembly is typically formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module 1a, and the battery module 1a is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module 1a can be formed by bundling a plurality of battery cells with cable ties.

[0089] In some embodiments, the battery device 100 can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body. As an example, the battery cell assembly can be a battery module 1a, and the battery cell assembly can be accommodated in the box body by fixing the battery module 1a in the box body. As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0090] In some embodiments, the box body is used to accommodate battery cells, and the box body can have various structures.

[0091] In some embodiments, the box body can include a first box body 1b and a second box body 1c, the first box body 1b and the second box body 1c cover each other, and the first box body 1b and the second box body 1c jointly define an accommodation space for accommodating battery cells. The second box body 1c can be a hollow structure with one end open, and the first box body 1b can be a plate-like structure. The first box body 1b covers the open side of the second box body 1c so that the first box body 1b and the second box body 1c jointly define an accommodation space; the first box body 1b and the second box body 1c can also both be hollow structures with one side open, and the open side of the first box body 1b covers the open side of the second box body 1c. Of course, the box body formed by the first box body 1b and the second box body 1c can have various shapes, such as a cylinder, a cuboid, etc.

[0092] In some embodiments, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly. As an example, the frame can include a plurality of side beams.

[0093] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0094] In some embodiments, the battery device 100 can be an energy storage device.

[0095] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods.

[0096] In some embodiments, the energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0097] In some embodiments, there are multiple battery cells. The multiple battery cells are first connected in series, parallel, or in a hybrid connection to form a battery module 1a. Then, multiple battery modules 1a are connected in series, parallel, or in a hybrid connection to form an entirety and are accommodated in a box.

[0098] The multiple battery cells in the battery module 1a can be electrically connected through a busbar component to achieve parallel, series, or hybrid connection of the multiple battery cells in the battery module 1a. The busbar component can be one or more, and each busbar component is used to electrically connect at least two battery cells.

[0099] An embodiment of the present application provides a battery cell, which includes a housing and an electrode assembly accommodated in the housing.

[0100] In some embodiments, the housing can be a steel shell, an aluminum shell, or a composite metal shell (such as a copper-aluminum composite housing), etc.

[0101] The housing can be a hollow structure, and an accommodation cavity for accommodating the electrode assembly and the electrolyte is formed inside it.

[0102] In some embodiments, the housing of the battery cell is a cylindrical housing, a square housing, a prismatic housing, or a housing of other shapes.

[0103] In some embodiments, the housing includes a shell body and an end cover. The shell body has an opening, and the end cover is connected to the shell body and covers the opening;

[0104] The shell body is a component for cooperating with the end cover to form the internal cavity of the battery cell. The formed internal cavity can be used to accommodate the electrode assembly, the electrolyte, and other components.

[0105] The shell body and the end cover can be independent components. Exemplarily, an opening can be provided on the shell body, and the end cover covers the opening at the opening to form the internal cavity of the battery cell.

[0106] The shell body can be of various shapes and various sizes, such as rectangular parallelepiped or cylindrical. Specifically, the shape of the shell body can be determined according to the specific shape and size of the electrode assembly. The material of the shell body can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0107] The shape of the end cap can be adapted to the shape of the housing to fit the housing. The material of the end cap can be the same as or different from that of the housing. Optionally, the end cap can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.). In this way, the end cap is not easily deformed when subjected to extrusion and collision, enabling the battery cell to have higher structural strength and improved reliability.

[0108] The end cap is connected to the housing by welding, bonding, snap - fitting or other means.

[0109] The housing can be open at one end or both ends. In some examples, the housing can be a structure with an opening on one side, and one end cap is provided and covers the housing. In other examples, the housing can also be a structure with openings on both sides, and two end caps are provided, and the two end caps respectively cover the two openings of the housing.

[0110] The electrode assembly is a component in the battery cell where an electrochemical reaction occurs. The housing can contain one or more electrode assemblies.

[0111] In some embodiments, the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet have opposite polarities, and the separator separates the positive electrode sheet and the negative electrode sheet.

[0112] At least a part of the separator is located between the positive electrode sheet and the negative electrode sheet. During the charging and discharging process of the battery cell, active ions (such as lithium ions) intercalate and deintercalate between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent short - circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0113] In some embodiments, the positive electrode sheet can include a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector.

[0114] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness, and the positive electrode film layer is provided on either or both of the two opposite surfaces of the positive electrode current collector.

[0115] As an example, the positive electrode current collector can be made of a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as a metal foil, pure metals, alloys, metals with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloy, titanium or silver, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0116] As an example, the positive electrode film layer includes a positive electrode active material, and the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and at least one of their modified compounds, etc. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0117] In some embodiments, the negative electrode sheet may include a negative electrode current collector.

[0118] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloy, titanium, or silver, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0119] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector.

[0120] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode film layer is provided on either or both of the two opposite surfaces of the negative electrode current collector.

[0121] As an example, the negative electrode film layer includes a negative electrode active material, and the negative electrode active material can be a negative electrode active material known in the art for battery monomers. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of battery monomers can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0122] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0123] In some embodiments, the separator includes a separator membrane. The separator membrane of this application can be any known porous structure membrane with good chemical stability and mechanical stability.

[0124] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different.

[0125] An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator membrane.

[0126] The separator can be a single component located between the positive electrode plate and the negative electrode plate, or can be attached to the surface of the positive electrode plate or the surface of the negative electrode plate.

[0127] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode plate and the negative electrode plate, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0128] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode plate and the negative electrode plate. The electrolyte of the present application can be selected according to requirements. The electrolyte can be liquid, gel or solid.

[0129] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0130] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro(bis(oxalato))phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0131] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0132] In some embodiments, the electrolyte solution may optionally further include additives. For example, the additives can include negative electrode film-forming additives, can also include positive electrode film-forming additives, and can also include additives that can improve certain performance of the battery cell, such as additives for improving the overcharge / fast charge performance of the battery cell, additives for improving the high-temperature performance of the battery cell, additives for improving the low-temperature performance of the battery cell, etc.

[0133] In some embodiments, the gel electrolyte includes a polymer as a backbone network and can be used in combination with an ionic liquid-lithium salt.

[0134] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0135] As an example, the polymer of the polymer solid electrolyte may include polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitriles, polyvinylidene fluorides, polymethyl methacrylates, single-ion polymers, polyionic liquids, celluloses, etc.

[0136] As an example, the inorganic solid electrolyte may be one or more of oxide solid electrolytes (crystalline perovskites, sodium superionic conductors, garnets, amorphous LiPON films), sulfide solid electrolytes (crystalline lithium superionic conductors (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfides), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0137] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0138] In some embodiments, the electrode assembly may be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0139] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0140] In some embodiments, the electrode assembly is a stacked structure.

[0141] As an example, multiple positive electrode sheets and multiple negative electrode sheets may be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked. As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0142] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0143] As an example, multiple separators may be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0144] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0145] In some embodiments, the positive electrode current collector may include a positive electrode tab, and the negative electrode current collector may include a negative electrode tab. The positive electrode tab and the negative electrode tab can be used to transmit current. As an example, at least a part of the positive electrode tab is not coated with the positive electrode film layer, and at least a part of the negative electrode tab is not coated with the negative electrode film layer.

[0146] Refer to Figures 3 to 7 , Figure 3 is an exploded view of a battery device provided by another embodiment of the present application; Figure 4 is an exploded view of a battery cell provided by an embodiment of the present application; Figure 5It is a schematic structural diagram of a battery cell provided by an embodiment of the present application; Figure 6 It is a partial structural schematic diagram of a battery device provided by an embodiment of the present application; Figure 7 It is a partial structural schematic diagram of a battery device provided by another embodiment of the present application.

[0147] As Figures 3 to 7 shown, the present application proposes a battery device, which includes a box body 1, a plurality of battery cells 2 and a heat exchange component 3. The box body 1 includes at least two limiting beams 11 arranged along the first direction x. The plurality of battery cells 2 are arranged between adjacent limiting beams 11 along the first direction x. The battery cell 2 includes a housing 21, an electrode assembly 22, an electrode terminal 23 and a pressure relief mechanism 24. The electrode assembly 22 is accommodated in the housing 21. The housing 21 includes a first wall 211 on one side of the electrode assembly 22 along the second direction y. The pressure relief mechanism 24 is arranged on the first wall 211. The pressure relief mechanism 24 is spaced apart from the electrode terminal 23. The electrode terminal 23 is arranged on the first wall 211. The first direction x is perpendicular to the second direction y. The heat exchange component 3 is arranged on the side of the first wall 211 away from the electrode assembly 22 and is used for heat exchange with the first wall 211. The heat exchange component 3 is connected to the limiting beam 11. In the projection plane perpendicular to the second direction y, the orthographic projection of the pressure relief mechanism 24 does not overlap with the orthographic projection of the heat exchange component 3.

[0148] The box body 1 is used to accommodate a plurality of battery cells 2, and the box body 1 can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 2.

[0149] The box body 1 includes a limiting beam 11. Exemplarily, the box body 1 defines a generally rectangular accommodating cavity, and the limiting beam 11 can divide the accommodating cavity into a plurality of functional areas. Some functional areas are used to accommodate the battery cells 2, and the battery cells 2 are directly or indirectly connected to the limiting beam 11.

[0150] The limiting beam 11 is used to limit the battery cell 2 and restrict the battery cell 2 between the limiting beams 11. Moreover, when the battery cell 2 expands and deforms during operation, the extrusion force is evenly dispersed to the entire box body 1 through the limiting beam 11, reducing the stress concentration and improving the stability of the entire battery structure.

[0151] Exemplarily, the box body 1 may include two limiting beams 11 and two support beams. The two limiting beams 11 are arranged at intervals along the first direction x in the box body 1. The support beams are connected to the adjacent two limiting beams 11. The two support beams are arranged at intervals along the third direction z. The plurality of battery cells 2 are arranged between the two limiting beams 11 and the two support beams. The first direction x is perpendicular to the third direction y.

[0152] In some examples, the plurality of battery cells 2 are disposed between two limiting beams 11 along the first direction x, and the plurality of battery cells 2 are arranged along the first direction x. Alternatively, the plurality of battery cells 2 are arranged in rows and columns.

[0153] Specifically, the housing 21 includes a first wall 211 located on one side of the electrode assembly 22 along the second direction y. The first wall 211 is provided with a mounting hole. A portion of the electrode terminal 23 extends into the housing 21 through the mounting hole for connection with the electrode assembly 22 .

[0154] The heat exchange component 3 is arranged on the side of the first wall 211 away from the electrode assembly 22 and is used to exchange heat with the first wall 211. It can be understood that in the second direction y, the first wall 211 is arranged between the electrode assembly 22 and the heat exchange component 3, and at least part of the positive projection of the heat exchange component 3 overlaps with the positive projection of the battery cell 2.

[0155] Optionally, in a projection plane perpendicular to the second direction y, the orthographic projection of the heat exchange assembly 3 overlaps with the orthographic projections of the plurality of battery cells 2 .

[0156] In some examples, in a projection plane perpendicular to the second direction y, at least a portion of the orthographic projection of the heat exchange component 3 overlaps with the orthographic projection of the electrode terminal 23 . Alternatively, the orthographic projection of the heat exchange component 3 does not overlap with the orthographic projection of the electrode terminal 23 .

[0157] In some examples, at least a portion of the heat exchange component 3 extends along the first direction x, and one end of the heat exchange component 3 along the first direction x is connected to the limiting beam 11 .

[0158] In some other examples, at least a portion of the heat exchange component 3 extends along the first direction x, and two opposite ends of the heat exchange component 3 along the first direction x are respectively connected to two limiting beams 11 .

[0159] In some embodiments, the heat exchange assembly 3 is connected to the limiting beam 11, and the connection method can be at least one of welding, bolt connection, hinged connection, clamping connection, and adhesive connection.

[0160] In some embodiments, the heat exchange component 3 includes one of a cold water plate, a heat conducting plate and a heat sink.

[0161] The battery cell 2 also includes a pressure relief mechanism 24, which is disposed on the first wall 211, and is spaced apart from the electrode terminal 23. In the projection plane perpendicular to the second direction y, the orthographic projection of the pressure relief mechanism 24 does not overlap with the orthographic projection of the heat exchange component 3. The heat exchange component 3 avoids the pressure relief mechanism 24, and when the pressure relief mechanism 24 is turned on, the gas can diffuse into the surrounding environment without hindrance, thereby quickly reducing the internal pressure of the battery. It can also effectively reduce the direct impact of high-temperature and high-pressure gas on the heat exchange component 3, reducing damage to the heat exchange component 3.

[0162] In some examples, in a projection plane perpendicular to the second direction y, the front projection of the pressure relief mechanism 24 and the front projection of the electrode terminal 23 do not overlap with the front projection of the heat exchange component 3.

[0163] In other examples, in a projection plane perpendicular to the second direction y, the front projection of the pressure relief mechanism 24 does not overlap with the front projection of the heat exchange component 3, and at least a part of the front projection of the electrode terminal 23 overlaps with the front projection of the heat exchange component 3.

[0164] In the battery device provided by the present application, the heat exchange component 3 is connected to the limiting beam 11. On the one hand, the limiting beam 11 can fix the heat exchange component 3, and the heat exchange component 3 has a high cooling effect, thereby reducing the heat accumulation inside the battery device and damaging the battery. On the other hand, the heat exchange component 3 is connected to the limiting beam 11. During the cycling of the battery cell 2, when it expands and squeezes the limiting beam 11, the limiting beam 11 transfers the extrusion force to the heat exchange component 3, reducing the stress concentration, restricting the deformation of the limiting beam 11, improving the structural stability of the limiting beam 11, and thus improving the service life and reliability of the battery device.

[0165] According to an embodiment of the present application, as Figure 6 and Figure 7 shown, the battery device further includes a connecting member 4, and the heat exchange component 3 is fixed to the limiting beam 11 through the connecting member 4.

[0166] Optionally, the heat exchange component 3 is detachably connected to the limiting beam 11 through the connecting member 4.

[0167] Exemplarily, the connecting member 4 is a bolt, the heat exchange component 3 is provided with a through threaded hole, and the bolt passes through the threaded hole and is connected to the limiting beam 11.

[0168] Exemplarily, the connecting member 4 is a snap member, the snap member is connected to the heat exchange component 3, and the limiting beam 11 is provided with a card slot, and the snap member is engaged with the card slot.

[0169] In these optional embodiments, the heat exchange component 3 is connected to the limiting beam 11 through the connecting member 4, which facilitates the installation of the heat exchange component 3 and the limiting beam 11.

[0170] With reference to Figures 8 to 14 , Figure 8 is a partial bottom view of the battery device provided by an embodiment of the present application; Figure 9 is Figure 8 a cross-sectional schematic view taken along the a-a direction; Figure 10 is Figure 9 an enlarged schematic view at a; Figure 11 is a partial bottom view of the battery device provided by another embodiment of the present application; Figure 12 is Figure 11 a cross-sectional schematic view taken along the b-b direction;Figure 13 It is a partial right view of a battery device provided by an embodiment of the present application; Figure 14 is Figure 13 An enlarged schematic view at b.

[0171] According to an embodiment of the present application, as Figures 8 to 14 shown, the battery device further includes a reinforcing member 5, the reinforcing member 5 is connected to the heat exchange component 3, and in a projection plane perpendicular to the second direction y, at least a part of the orthographic projection of the reinforcing member 5 overlaps with the orthographic projection of the limiting beam 11.

[0172] In some embodiments, the reinforcing member 5 is one of a reinforcing block, a reinforcing sheet, or a reinforcing plate.

[0173] Optionally, the strength of the reinforcing member 5 is greater than or equal to the strength of the heat exchange component 3.

[0174] In some embodiments, the battery device includes a plurality of reinforcing members 5, and the plurality of reinforcing members 5 are spaced apart from each other on the heat exchange component 3.

[0175] Optionally, in a projection plane perpendicular to the second direction y, the orthographic projection of the reinforcing member 5 overlaps with the orthographic projection of the limiting beam 11.

[0176] In some embodiments, the battery device further includes a connecting member 4, and in the second direction y, at least a part of the projection of the connecting member 4 on the limiting beam 11 overlaps with the projection of the connecting member 4 on the limiting beam 11.

[0177] At least a part of the orthographic projection of the reinforcing member 5 overlaps with the orthographic projection of the limiting beam 11. To a certain extent, the reinforcing member 5 can bear the acting force transmitted by the limiting beam 11 to the heat exchange component 3, and further reduce the stress borne by the heat exchange component 3.

[0178] In these optional embodiments, the reinforcing member 5 can strengthen the structural strength of the heat exchange component 3. When the battery device is subjected to external forces such as vibration and impact, the reinforcing member 5 can share part of the load borne by the heat exchange component 3 to improve the structural stability of the heat exchange component 3.

[0179] With reference to Figure 15 , Figure 15 It is a schematic structural view of a heat exchange component, a connecting member, and a reinforcing member provided by an embodiment of the present application.

[0180] According to an embodiment of the present application, as Figure 6 and Figure 15 shown, the surface of the heat exchange component 3 along the second direction y is provided with an inwardly recessed concave portion 31, and at least a part of the reinforcing member 5 is embedded in the concave portion 31.

[0181] In some embodiments, the heat exchange component 3 is provided with a recessed portion 31 on the surface along the second direction y. The reinforcing member 5 includes a connected first portion and a second portion. The first portion is embedded in the recessed portion 31, and the second portion protrudes from the recessed portion 31.

[0182] Exemplarily, the heat exchange component 3 has opposite first and second surfaces along the second direction y, and both the first and second surfaces are provided with recessed portions 31 that accommodate at least part of the reinforcing member 5.

[0183] Optionally, the heat exchange component 3 is provided with a recessed portion 31 on the surface facing the limiting beam 11 along the second direction y.

[0184] More optionally, the surface of the limiting beam 11 facing the heat exchange component 3 is provided with an inwardly recessed groove, which is disposed opposite to the recessed portion 31. A part of the reinforcing member 5 is disposed in the recessed portion 31, and another part of the reinforcing member 5 is disposed in the groove.

[0185] In these optional embodiments, the recessed portion 31 is fitted with the reinforcing member 5, so that there is a large contact area between the reinforcing member 5 and the heat exchange component 3. Moreover, the recessed portion 31 can limit the reinforcing member 5, effectively inhibiting relative displacement between the reinforcing member 5 and the heat exchange component 3, so as to improve the connection stability therebetween. In addition, the reinforcing member 5 is embedded in the recessed portion 31, making the connection between the reinforcing member 5 and the heat exchange component 3 closer in space, thereby reducing the space occupied by the reinforcing member 5 and being beneficial to improving the energy density of the battery device.

[0186] According to an embodiment of the present application, the battery device includes a plurality of reinforcing members 5, and at least two reinforcing members 5 are located on opposite sides of the heat exchange component 3 along the second direction y.

[0187] Exemplarily, the heat exchange component 3 has opposite first and second surfaces along the second direction y. The first surface is provided with an inwardly recessed first recess, and the second surface is provided with an inwardly recessed second recess. The first surface faces the limiting beam 11, and the surface of the limiting beam 11 facing the heat exchange component 3 is provided with an inwardly recessed groove, which is disposed opposite to the recessed portion 31. The two reinforcing members 5 include a first reinforcing member and a second reinforcing member. A part of the first reinforcing member is disposed in the first recess, another part of the first reinforcing member is disposed in the groove, and the second reinforcing member is disposed in the second recess.

[0188] In these optional embodiments, with such a setting, the structural stability of the heat exchange component 3 is effectively improved.

[0189] With reference to Figure 17 and Figure 18 , Figure 17 is an exploded view of a heat exchange component provided by an embodiment of the present application; Figure 18It is a schematic structural diagram of a heat exchange component, a connecting piece and a reinforcing piece provided by another embodiment of the present application.

[0190] According to an embodiment of the present application, as Figure 8 , such as 16 to Figure 18 shown, the heat exchange component 3 is provided with a first mounting hole 32. The reinforcing member 5 is provided with a second mounting hole 51. The battery device further includes a connecting piece 4, and the connecting piece 4 passes through the first mounting hole 32 and the second mounting hole 51 and is fixed to the limiting beam 11.

[0191] In some examples, the heat exchange component 3 is provided with a first mounting hole 32, the reinforcing member 5 is provided with a second mounting hole 51, the first mounting hole 32 and the second mounting hole 51 are through holes 33, and the first mounting hole 32 and the second mounting hole 51 are coaxially arranged. Correspondingly, the limiting beam 11 is provided with a connecting hole, and the connecting piece 4 passes through the first mounting hole 32, the second mounting hole 51 and extends into the connecting hole to be connected with the limiting beam 11, so as to connect the reinforcing member 5, the heat exchange component 3 and the limiting beam 11.

[0192] Optionally, reinforcing members 5 are provided on both sides of the heat exchange component 3 along the second direction y.

[0193] Exemplarily, the first mounting hole 32, the second mounting hole 51 and the connecting piece 4 are threadedly connected.

[0194] In these alternative embodiments, through the cooperation of the first mounting hole 32 and the second mounting hole 51 with the connecting piece 4, the connection of the reinforcing member 5, the heat exchange component 3 and the limiting beam 11 is realized, which facilitates the installation and disassembly between the reinforcing member 5, the heat exchange component 3 and the limiting beam 11, and simplifies the installation method of the heat exchange component 3 and the limiting beam 11.

[0195] According to an embodiment of the present application, as Figures 8 to 10 shown, the battery cell 2 includes two electrode terminals 23, and the pressure relief mechanism 24 is located between the two electrode terminals 23. In the second direction y, the projection of the heat exchange component 3 on the first wall 211 overlaps with the part of the first wall 211 located between the two electrode terminals 23.

[0196] Optionally, in the arrangement direction of the two electrode terminals 23, the size of the heat exchange component 3 is smaller than the distance between the two electrode terminals 23.

[0197] In these alternative embodiments, during the charging and discharging process of the battery, current will flow into or out of the battery cell 2 through the electrode terminals 23, which is likely to cause a local temperature rise near the electrode terminals 23. Therefore, in the second direction y, the projection of the heat exchange component 3 on the first wall 211 overlaps with the part of the first wall 211 located between the two electrode terminals 23, which is beneficial to improving the defect of local temperature rise.

[0198] According to an embodiment of the present application, as Figures 8 to 10 , Figure 15 and Figure 16 shown, the heat exchange assembly 3 is provided with a through hole 33 extending along the second direction y, and the projection of the pressure relief mechanism 24 along the second direction y on the heat exchange assembly 3 falls into the through hole 33.

[0199] In some examples, the heat exchange assembly 3 is provided with a through hole 33. The through hole 33 penetrates the heat exchange assembly 3 along the second direction y, and the through hole 33 extends along the first direction x. The pressure relief mechanisms 24 of the plurality of battery cells 2 are arranged opposite to the through hole 33 along the second direction y.

[0200] In some other examples, the heat exchange assembly 3 is provided with a plurality of through holes 33. The through holes 33 penetrate the heat exchange assembly 3 along the second direction y, the plurality of through holes 33 are arranged at intervals along the first direction x, and the plurality of through holes 33 are arranged opposite to the pressure relief mechanisms 24 of the plurality of battery cells 2.

[0201] In some examples, on the projection plane perpendicular to the second direction y, the orthographic projection of the hole wall of the through hole 33 covers the orthographic projection of the pressure relief mechanism 24.

[0202] In these alternative embodiments, being arranged in this way further reduces the interference between the heat exchange assembly 3 and the pressure relief mechanism 24.

[0203] According to an embodiment of the present application, as Figure 11 and Figure 12 shown, in the third direction z, the heat exchange assembly 3 is located on the side of the electrode terminal 23 away from the pressure relief mechanism 24, and the third direction z is perpendicular to the first direction x and the second direction y.

[0204] In some examples, the battery cell 2 includes two electrode terminals 23. The two electrode terminals 23 include a first electrode terminal 23 and a second electrode terminal 23, and the pressure relief mechanism 24 is located between the first electrode terminal 23 and the second electrode terminal 23. In the second direction y, the projection of the heat exchange assembly 3 on the first wall 211 is located on the side of the first electrode terminal 23 away from the pressure relief mechanism 24 and on the side of the second electrode terminal 23 away from the pressure relief mechanism 24.

[0205] In some examples, in the projection plane perpendicular to the second direction y, the orthographic projection of the electrode terminal 23 does not overlap with the orthographic projection of the heat exchange assembly 3.

[0206] In these alternative embodiments, being arranged in this way simplifies the installation of the heat exchange assembly 3 and reduces the interference of the heat exchange assembly 3 on the electrode terminal 23 and the pressure relief mechanism 24.

[0207] According to an embodiment of the present application, as Figures 15 to 21 shown, a flow channel 34 is provided inside the heat exchange assembly 3, and the flow channel 34 is used to guide the flow of the heat exchange medium.

[0208] In some examples, in the second direction y, the first wall 211 at least partially overlaps with the flow channel 34 inside the heat exchange component 3, enabling the heat exchange component 3 to achieve a better cooling effect, thereby reducing the heat accumulation inside the battery device and damaging the battery.

[0209] In some examples, the heat exchange medium is a fluid medium, for example, including water, ethanol, oil, and Freon. The heat exchange medium can absorb the heat inside the battery, or the flowing heat exchange medium takes away the heat inside the battery to the external environment to achieve the purpose of cooling.

[0210] In some examples, the flow channel 34 can be at least one of a wavy shape, a toothed shape, and an S shape.

[0211] Optionally, the cross-section of the flow channel 34 along the second direction y is flat. This can increase the contact area with the component to be heat-exchanged, thereby increasing the heat exchange area.

[0212] In these alternative embodiments, the heat exchange component 3 is provided with a flow channel 34 inside. The flow channel 34 is used to guide the flow of the heat exchange medium. The heat exchange medium flowing in the flow channel 34 can quickly take away the heat generated by the battery cell 2.

[0213] According to an embodiment of the present application, as Figure 17 and Figure 21 shown, the heat exchange component 3 includes a plate main body 35 and a cover plate 36. The plate main body 35 is provided with a diversion groove 351. The cover plate 36 is connected to the plate main body 35 and covers the diversion groove 351 to enclose and form the flow channel 34.

[0214] In some examples, the groove width of the diversion groove 351 is smaller than the width of the plate main body 35.

[0215] Exemplarily, the plate main body 35 has a predetermined length and width. The length is parallel to the first direction x, and the diversion groove 351 extends and is formed along the length direction of the end plate main body 35.

[0216] In some examples, the number of the diversion grooves 351 is one, and the diversion groove 351 extends along the first direction x. With this setting, the width of the diversion groove 351 can be appropriately increased, so that the heat exchange medium has a larger heat transfer area.

[0217] In other examples, the number of the diversion grooves 351 is multiple, and the multiple diversion grooves 351 are arranged at intervals along the third direction z. Each diversion groove 351 extends along the first direction x. With this setting, the width of each diversion groove 351 can be appropriately reduced. While achieving the cooling effect, the use of the heat exchange medium can be saved.

[0218] Exemplarily, the plate body 35 is provided with a plurality of flow guiding grooves 351, and the plurality of flow guiding grooves 351 are independently arranged; alternatively, the plurality of flow guiding grooves 351 communicate with each other.

[0219] In these alternative embodiments, being arranged in this way facilitates the processing and manufacturing of the heat exchange component 3.

[0220] According to an embodiment of the present application, as Figure 17 and Figure 21 shown, the heat exchange component 3 further includes a flow guiding column 37, the flow guiding column 37 is arranged in the flow guiding groove 351, and the flow guiding column 37 protrudes towards the cover plate 36 relative to the bottom of the flow guiding groove 351.

[0221] The flow guiding column 37 is arranged in the flow guiding groove 351, and the flow guiding column 37 protrudes towards the partition plate relative to the bottom of the flow guiding groove 351, which can define at least two sub-grooves in the flow guiding groove 351, thereby forming a plurality of flow passages.

[0222] In some examples, the end plate body 35 includes one flow guiding column 37, and one flow guiding column 37 defines two sub-grooves in the flow guiding groove 351; alternatively, the end plate body 35 includes N flow guiding columns 37, and N flow guiding columns 37 define N + 1 sub-grooves in the flow guiding groove 351.

[0223] Exemplarily, the plate body 35 is provided with two flow guiding grooves 351, the two flow guiding grooves 351 are arranged at intervals along the third direction z, the flow guiding grooves 351 at least partially extend along the first direction x, each flow guiding groove 351 is provided with a flow guiding column 37, the flow guiding column 37 protrudes towards the cover plate 36 relative to the bottom of the flow guiding groove 351, and each flow guiding column 37 defines two sub-grooves in each flow guiding groove 351.

[0224] In these alternative embodiments, the arrangement of the flow guiding column 37, on the one hand, can play a role in supporting the cover plate 36 and can also increase the overall structural strength of the heat exchange component 3; on the other hand, the flow guiding column 37 can define a plurality of sub-grooves in the flow guiding groove 351 to plan the flow route of the heat exchange medium, which can improve the heat transfer efficiency and thus improve the cooling efficiency.

[0225] According to an embodiment of the present application, as Figures 15 to 17 shown, the heat exchange component 3 is provided with a through hole 33, the through hole 33 penetrates the plate body 35 and the cover plate 36 along the second direction y, and the flow guiding groove 351 is arranged in a staggered manner with the through hole 33.

[0226] In some examples, in the second direction y, the projection of the heat exchange component 3 on the first wall 211 overlaps with the part of the first wall 211 located between the two electrode terminals 23. The heat exchange component 3 is provided with a through hole 33, the through hole 33 penetrates the plate body 35 and the cover plate 36 along the second direction y, and the flow guiding groove 351 is arranged in a staggered manner with the through hole 33.

[0227] Exemplarily, the heat exchange component 3 includes a plate body 35 and a cover plate 36. The plate body 35 is provided with two diversion grooves 351 and two diversion columns 37. The cover plate 36 is connected to the plate body 35 and covers the two diversion grooves 351 to enclose a flow channel 34. Each diversion column 37 is disposed in the corresponding diversion groove 351, and the diversion column 37 protrudes in the direction of the cover plate 36 with respect to the bottom of the diversion groove 351. The heat exchange component 3 is provided with a through hole 33, and the through hole 33 penetrates the plate body 35 and the cover plate 36 along the second direction y, and the through hole 33 is located between the two diversion grooves 351.

[0228] According to an embodiment of the present application, as Figure 16 , Figure 19 and Figure 20 shown, the flow channel 34 includes at least two straight sections 341 and at least one bent section 342. The straight sections 341 extend along the first direction x, and the two straight sections 341 are spaced apart along the third direction z. The bent section 342 is connected to the adjacent two straight sections 341 at the head and tail. The third direction z is perpendicular to the first direction x and the second direction y. The heat exchange component 3 is provided with a through hole 33, and the through hole 33 is located between the two straight sections 341.

[0229] Specifically, the heat exchange component 3 has a rectangular structure with a predetermined length and width. The flow channel 34 includes two straight sections 341 and at least one bent section 342. The straight sections 341 extend along the length direction, that is, along the first direction x. The two straight sections 341 are spaced apart along the width direction, that is, along the third direction z. The bent section 342 is connected to the adjacent two straight sections 341 at the head and tail to enable the heat exchange medium to flow in the flow channel 34.

[0230] In some examples, the two straight sections 341 and the plurality of battery cells 2 arranged along the first direction x at least partially overlap along the second direction y.

[0231] In these alternative embodiments, with such an arrangement, the density of the flow channel 34 in the region opposite to the battery cells 2 can be further increased. Moreover, the adjacent two straight sections 341 are connected by the bent section 342, which can achieve a smooth transition between the two straight sections 341 and is beneficial to the flow of the heat exchange medium in the heat exchange component 3.

[0232] In some examples, the battery device includes a first battery group and a second battery group arranged along a third direction z, and the first battery group and the second battery group each include a plurality of battery cells 2 arranged along a first direction x. The flow channel 34 includes a first straight section 341, a second straight section 341, and a bent section 342, the first straight section 341 and the second straight section 341 extend along the first direction x, the first straight section 341 and the second straight section 341 are arranged at intervals along the third direction z, the bent section 342 connects the first straight section 341 and the second straight section 341 end to end, and the third direction z is perpendicular to the first direction x and the second direction y. On a projection plane perpendicular to the second direction y, the orthographic projections of the plurality of battery cells 2 of the first battery group overlap with the orthographic projections of the first straight section 341, and the orthographic projections of the plurality of battery cells 2 of the second battery group overlap with the orthographic projections of the second straight section 341.

[0233] According to one embodiment of the present application, Figure 16 As shown, the flow channel 34 has an outlet section 343 and an inlet section 344 , one of the two straight sections 341 is connected to the outlet section 343 , and the other is connected to the inlet section 344 , and the outlet section 343 and the inlet section 344 are located on the same side.

[0234] Optionally, the heat exchange component 3 further includes two joints, one of which is connected to the outlet section 343 , and the other is connected to the inlet section 344 .

[0235] In some examples, the outlet section 343 and the straight section 341 are an integrally formed structure.

[0236] In some examples, the inlet section 344 and the straight section 341 are an integrally formed structure.

[0237] According to one embodiment of the present application, the first wall 211 is a bottom wall.

[0238] The first wall 211 is a bottom wall. The battery cell 2 is placed upside down in the box body 1 , and the electrode terminal 23 and the pressure relief mechanism 24 face the bottom of the box body 1 .

[0239] In some examples, the battery device further includes a bottom protective plate, and the bottom plate is disposed on a side of the heat exchange assembly 3 facing away from the first wall 211 .

[0240] In a second aspect, the present application provides an electrical device, comprising a battery device according to the foregoing, wherein the battery device is used to store or provide electrical energy.

[0241] According to some embodiments of the present application, see Figures 3 to 6 , Figures 8 to 10 , Figure 13 and Figure 17 As shown, the present application provides a battery device, which includes a box body 1, a connector 4, a reinforcement 5, a plurality of battery cells 2 and a heat exchange assembly 3.

[0242] The box body 1 includes at least two limiting beams 11 arranged along the first direction x.

[0243] A plurality of battery cells 2 are arranged between adjacent limiting beams 11 along the first direction x. The battery cell 2 includes a housing 21, an electrode assembly 22, two electrode terminals 23, and a pressure relief mechanism 24. The electrode assembly 22 is accommodated in the housing 21. The housing 21 includes a first wall 211 on one side of the electrode assembly 22 along the second direction y. The electrode terminal 23 is arranged on the first wall 211. The first direction x is perpendicular to the second direction y. The pressure relief mechanism 24 is located between the two electrode terminals 23.

[0244] The heat exchange component 3 is arranged on the side of the first wall 211 away from the electrode assembly 22 and is used for heat exchange with the first wall 211. The surface of the heat exchange component 3 along the second direction y is provided with an inwardly concave portion 31, and at least a part of the reinforcing member 5 is embedded in the concave portion 31. The heat exchange component 3 is provided with a first mounting hole 32, and the reinforcing member 5 is provided with a second mounting hole 51. The connecting member 4 passes through the first mounting hole 32 and the second mounting hole 51 and is fixed to the limiting beam 11. In the second direction y, the projection of the heat exchange component 3 on the first wall 211 overlaps with the part of the first wall 211 located between the two electrode terminals 23. The heat exchange component 3 is provided with a through hole 33 extending along the second direction y, and the projection of the pressure relief mechanism 24 along the second direction y on the heat exchange component 3 falls into the through hole 33. A flow channel 34 is arranged inside the heat exchange component 3, and the flow channel 34 is used to guide the flow of the heat exchange medium. The heat exchange component 3 includes a plate body 35, a guide column 37, and a cover plate 36. The plate body 35 is provided with a guide groove 351. The cover plate 36 is connected to the plate body 35 and covers the guide groove 351 to enclose and form the flow channel 34. The heat exchange component 3 further includes a guide column 37. The guide column 37 is arranged in the guide groove 351, and the guide column 37 protrudes from the bottom of the guide groove 351 in the direction towards the cover plate 36. The through hole 33 penetrates the plate body 35 and the cover plate 36 along the second direction y, and the guide groove 351 is arranged in a staggered manner with the through hole 33. The flow channel 34 includes two straight sections 341 and a bent section 342. The straight sections 341 extend along the first direction x, and the two straight sections 341 are arranged at intervals along the third direction z. The bent section 342 connects the two straight sections 341 at the head and the tail. The third direction z is perpendicular to the first direction x and the second direction y. The through hole 33 is located between the two straight sections 341.

[0245] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and its components can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body comprises at least two limiting beams arranged along a first direction; A plurality of battery cells are arranged between adjacent limiting beams along the first direction, the battery cells comprising a housing, an electrode assembly, an electrode terminal and a pressure relief mechanism, the electrode assembly is accommodated in the housing, the housing comprises a first wall located on one side of the electrode assembly along the second direction, the pressure relief mechanism is arranged on the first wall, the pressure relief mechanism is spaced apart from the electrode terminal, the electrode terminal is arranged on the first wall, and the first direction is perpendicular to the second direction; A heat exchange component is arranged on a side of the first wall away from the electrode assembly and is used for exchanging heat with the first wall. The heat exchange component is connected to the limiting beam. In a projection plane perpendicular to the second direction, the orthographic projection of the pressure relief mechanism does not overlap with the orthographic projection of the heat exchange component.

2. The battery device according to claim 1, characterized in that: The battery device also includes a connecting member, and the heat exchange assembly is fixed to the limiting beam through the connecting member.

3. The battery device according to claim 1, characterized in that: The battery device further includes a reinforcement member connected to the heat exchange assembly, and in a projection plane perpendicular to the second direction, an orthographic projection of the reinforcement member at least partially overlaps with an orthographic projection of the limiting beam.

4. The battery device according to claim 3, characterized in that: A concave portion that is recessed inward is provided on the surface of the heat exchange component along the second direction, and at least a portion of the reinforcement member is embedded in the concave portion.

5. The battery device according to claim 3, characterized in that: The battery device includes a plurality of the reinforcement members, and at least two of the reinforcement members are located on two opposite sides of the heat exchange component along the second direction.

6. The battery device according to claim 3, characterized in that: The heat exchange assembly is provided with a first mounting hole; The reinforcement member is provided with a second mounting hole; The battery device further includes a connecting member, which passes through the first mounting hole and the second mounting hole and is fixed to the limiting beam.

7. The battery device according to claim 1, characterized in that: The battery cell comprises two electrode terminals, and the pressure relief mechanism is located between the two electrode terminals; In the second direction, a projection of the heat exchange assembly on the first wall overlaps with a portion of the first wall located between the two electrode terminals.

8. The battery device according to claim 7, characterized in that: The heat exchange component is provided with a through hole extending along the second direction, and the projection of the pressure relief mechanism on the heat exchange component along the second direction falls into the through hole.

9. The battery device according to claim 7, characterized in that: In a third direction, the heat exchange assembly is located on a side of the electrode terminal away from the pressure relief mechanism, and the third direction is perpendicular to the first direction and the second direction.

10. The battery device according to claim 1, characterized in that: A flow channel is provided inside the heat exchange component, and the flow channel is used to guide the flow of the heat exchange medium; The heat exchange assembly includes a plate body and a cover plate. The plate body is provided with a guide groove. The cover plate is connected to the plate body and covers the guide groove to enclose and form the flow channel.

11. The battery device according to claim 10, characterized in that: The heat exchange assembly further includes a guide column, which is disposed in the guide groove and protrudes relative to the groove bottom of the guide groove toward the cover plate.

12. The battery device according to claim 10, characterized in that: The heat exchange component is provided with a through hole, and the through hole penetrates the plate body and the cover plate along the second direction, and the guide groove is staggered with the through hole.

13. The battery device according to claim 10, characterized in that: The flow channel includes at least two straight sections and at least one bent section, the straight sections extend along the first direction, two straight sections are arranged at intervals along a third direction, the bent section connects two adjacent straight sections end to end, and the third direction is perpendicular to the first direction and the second direction; The heat exchange component is provided with a through hole, and the through hole is located between the two straight sections.

14. The battery device according to claim 13, characterized in that: The flow channel has an outlet section and an inlet section, one of the two straight sections is connected to the outlet section, the other is connected to the inlet section, and the outlet section and the inlet section are located on the same side.

15. The battery device according to claim 1, characterized in that: The first wall is a bottom wall.

16. An electrical device, characterized in that: The invention comprises a battery device according to any one of claims 1 to 15, wherein the battery device is used to store or provide electrical energy.

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