Battery device and electric apparatus

Abstract

Provided in the embodiments of the present application are a battery device and an electric apparatus. The battery device comprises: a plurality of battery cell assemblies connected in series, wherein a first battery cell assembly among the plurality of battery cell assemblies comprises a plurality of battery cells connected in parallel, and the plurality of battery cells comprise a first battery cell and a second battery cell; and a current-limiting element, wherein the current-limiting element is located on a circuit formed by the first battery cell and the second battery cell. The battery device and the electric apparatus in the embodiments of the present application can improve the reliability of the battery device.

Description

Battery devices and electrical equipment Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical appliance. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0003] To increase the capacity of a battery device, multiple battery cells can be electrically connected in a parallel configuration. However, if any one of these cells experiences thermal runaway, the short-circuit current will generate a large amount of heat, leading to heat dissipation between the parallel-connected cells and posing a safety hazard.

[0004] Summary of the Invention

[0005] This application provides a battery device and an electrical appliance that can improve the reliability of the battery device.

[0006] In a first aspect, a battery device is provided, comprising: a plurality of battery cell assemblies connected in series, wherein a first battery cell assembly comprises a plurality of battery cells connected in parallel, the plurality of battery cells including a first battery cell and a second battery cell; and a current limiting element located on a circuit formed by the first battery cell and the second battery cell.

[0007] Therefore, in the battery device of this application embodiment, even if the thermally runaway battery cell is close to a short circuit and is equivalent to a resistor with a very small resistance, the current in the circuit between the first and second battery cells connected in parallel can be limited to not be too large in the case of thermal runaway of the first or second battery cell, thus reducing the risk of short circuit and thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0008] In some embodiments, the sum of the resistance values ​​of all the current-limiting elements provided in the circuit formed by the first and second battery cells ranges from [0.15Ω to 75Ω]. At least one current-limiting element can be provided in the circuit formed by the first and second battery cells, and the sum of the resistance values ​​of this at least one current-limiting element should not be too small. For example, the sum of the resistance values ​​is typically set to be greater than or equal to 0.15Ω. In the event of thermal runaway in either the first or second battery cell, the short-circuit current in the circuit between the first and second battery cells can be limited to prevent excessive current, reducing the risk of thermal diffusion in the battery device and improving its reliability. Conversely, the sum of the resistance values ​​of this at least one current-limiting element should not be too large either. For example, the sum of the resistance values ​​is typically set to be less than or equal to 75Ω. In this case, when a voltage difference occurs between the parallel-connected first and second battery cells, the balancing current is smaller, and the battery device can self-balance the voltage difference in a shorter time, meeting design requirements.

[0009] In some embodiments, the first battery cell and the second battery cell satisfy at least one of the following conditions: the capacity of the first battery cell is in the range of [20Ah, 88Ah]; the capacity of the second battery cell is in the range of [20Ah, 88Ah]; the mass of the first battery cell is in the range of [0.37kg, 1.6kg]; and the mass of the second battery cell is in the range of [0.37kg, 1.6kg]. When the first battery cell and the second battery cell satisfy any of the above conditions, the sum of the resistance values ​​of at least one current-limiting element in the circuit of the first battery cell and the second battery cell can be set to be in the range of [0.075Ω, 37.5Ω], so that the current in the circuit of the first battery cell and the second battery cell meets the design requirements.

[0010] In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [35Ah, 50Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [0.25kg, 0.75kg]; and the sum of the resistance values ​​of all the current limiting elements provided in the circuit formed by the first battery cell and the second battery cell is [0.28Ω, 30Ω].

[0011] In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [15Ah, 30Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [0.27kg, 0.78kg]; and the sum of the resistance values ​​of all the current limiting elements provided on the circuit formed by the first battery cell and the second battery cell is [0.25Ω, 60Ω].

[0012] In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [9Ah, 23Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [0.13kg, 0.6kg]; and the sum of the resistance values ​​of all the current limiting elements provided in the circuit formed by the first battery cell and the second battery cell is [0.3Ω, 75Ω].

[0013] In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [12Ah, 30Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [0.28kg, 0.52kg]; and the sum of the resistance values ​​of all the current limiting elements provided in the circuit formed by the first battery cell and the second battery cell is [0.28Ω, 60Ω].

[0014] In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [73Ah, 102Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [1.1kg, 2.1kg]; and the sum of the resistance values ​​of all the current limiting elements provided in the circuit formed by the first battery cell and the second battery cell is [0.15Ω, 15Ω].

[0015] In the above embodiments, for battery cells of different qualities and different capacities, the range of the sum of the resistance values ​​of at least one current-limiting element in the circuit of the first battery cell and the second battery cell can be appropriately adjusted. This can better balance the different design requirements of the current in the circuit of the first battery cell and the second battery cell under normal use of the battery device and under thermal runaway of any one of the battery cells, thereby improving the reliability of the battery device.

[0016] In some embodiments, the battery device further includes: a first busbar for connecting the positive electrode of the first battery cell and the positive electrode of the second battery cell; and a second busbar for connecting the negative electrode of the first battery cell and the negative electrode of the second battery cell; wherein at least one of the first and second busbars includes the current-limiting element. If only one of the first and second busbars is provided with a current-limiting element, the number of busbars with current-limiting elements within the battery device can be reduced, thereby reducing the complexity of the internal structure of the battery device, facilitating the processing and assembly of the battery device, and improving the processing efficiency of the battery device. If both the first and second busbars are provided with current-limiting elements, the reliability of the battery device can be improved.

[0017] In some embodiments, each of the at least one busbar includes a first connection portion, a second connection portion, and a safety portion. The first connection portion is used to connect to the first battery cell, the second connection portion is used to connect to the second battery cell, and the safety portion is located between the first connection portion and the second connection portion, and the safety portion includes the current-limiting element. Taking the case of thermal runaway of the first battery cell as an example, even if the first battery cell itself is approximately short-circuited, equivalent to a resistor with a very small resistance, the current in the circuit between the first and second battery cells connected in parallel, including the current-limiting element, will not be too large, reducing the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0018] In some embodiments, each busbar component further includes a protective component for protecting the connection between the first connecting portion and the safety portion, and / or protecting the connection between the second connecting portion and the safety portion. This protective component can improve the structural strength of the connection between the first connecting portion and the safety portion, and / or improve the structural strength of the connection between the second connecting portion and the safety portion, thereby reducing the risk of breakage between the safety portion and the first connecting portion and / or between the safety portion and the second connecting portion during the use or transportation of the battery device, such as in the event of a collision, thereby improving the reliability of the battery device.

[0019] In some embodiments, the safety part is fixed to the first connecting part by welding; and / or, the safety part is fixed to the second connecting part by welding to facilitate processing.

[0020] In some embodiments, the current-limiting element includes at least one of the following: a capacitor, a bonding resistor, a resistance wire, and a diaphragm resistor, which are easy to implement.

[0021] In some embodiments, the first battery cell includes: a housing including a first wall; electrode terminals disposed on the first wall; and an insulating structure disposed between the electrode terminals and the first wall for isolating the electrode terminals from the first wall in the event of thermal runaway of the first battery cell. In the event of thermal runaway of the first battery cell, the insulating structure can also be used to isolate the electrode terminals from the first wall, ensuring that the electrode terminals and the first wall remain electrically insulated, thereby reducing the risk of a short circuit. This causes the first battery cell to form an open circuit, increasing the resistance of the thermally runaway first battery cell and consequently increasing the total current-limiting element Rp in the circuit formed by the first battery cell and the second battery cell.

[0022] In some embodiments, the first battery cell further includes: an electrode assembly housed within the housing; a connecting member for electrically connecting the electrode terminal and a first tab of the electrode assembly; and an insulating structure located between the connecting member and the first wall for isolating the connecting member from the first wall in the event of thermal runaway of the first battery cell. The insulating structure is also disposed between the connecting member and the first wall to electrically insulate the connecting member from the first wall. Furthermore, in the event of thermal runaway of the first battery cell, the insulating structure of the first battery cell can also be used to isolate the connecting member from the first wall, ensuring electrical insulation between the connecting member and the first wall, reducing the risk of a short circuit between the connecting member and the first wall, causing the first battery cell to form an open circuit, increasing the resistance of the thermally runaway first battery cell, and consequently increasing the total current-limiting element Rp in the circuit formed by the first battery cell and the second battery cell.

[0023] In some embodiments, the second tab of the electrode assembly is electrically connected to the first wall, and the second tab has the opposite polarity to the first tab. The first wall can serve as an electrode terminal and be used for electrical connection with other battery cells, which simplifies the structure of the battery cell and reduces the number of electrode terminals.

[0024] In some embodiments, the battery device further includes: a third busbar for electrical connection to the electrode terminals; the insulating structure is also located between the first wall and the third busbar for isolating the first wall and the third busbar in the event of thermal runaway of the first battery cell. The insulating structure is also disposed between the third busbar and the first wall to electrically insulate the third busbar from the first wall. Furthermore, in the event of thermal runaway of the first battery cell, the insulating structure of the first battery cell can also be used to isolate the third busbar from the first wall, ensuring electrical insulation between the third busbar and the first wall, reducing the risk of a short circuit between the third busbar and the first wall, causing an open circuit in the first battery cell, thereby increasing the resistance of the thermally runaway first battery cell, and thus increasing the total current-limiting element Rp in the circuit formed by the first battery cell and the second battery cell.

[0025] In some embodiments, the housing includes: a shell having a hollow structure with an opening; and a cover plate for closing the opening, the cover plate including the first wall for processing.

[0026] In some embodiments, the melting point of the insulation structure is greater than or equal to 400°C to reduce the risk of the insulation structure melting in the event of thermal runaway of the battery cell, thereby reducing the risk of insulation failure between the connecting member and the first wall.

[0027] In some embodiments, the insulating structure is made of at least one of the following materials: ceramics, glass fiber, and polytetrafluoroethylene. These materials are readily available to meet design requirements, are not easily melted, and are easy to implement and process.

[0028] In a second aspect, an electrical device is provided, comprising: a battery device as described in the first aspect and any implementation thereof, the battery device being used to supply power to the electrical device.

[0029] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0030] Figure 1 is a structural schematic diagram of a vehicle disclosed in an embodiment of this application;

[0031] Figure 2 is an exploded structural diagram of a battery device disclosed in an embodiment of this application;

[0032] Figure 3 is a schematic diagram of the connection relationship between individual battery cells in a battery device disclosed in an embodiment of this application;

[0033] Figure 4 is a schematic diagram of a first battery cell assembly disclosed in an embodiment of this application;

[0034] Figure 5 is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application;

[0035] Figure 6 is an exploded view of a partial structure of a battery cell disclosed in an embodiment of this application;

[0036] Figure 7 is a partial cross-sectional schematic diagram of a battery cell disclosed in an embodiment of this application;

[0037] Figure 8 is a partial cross-sectional schematic diagram of another battery cell disclosed in an embodiment of this application;

[0038] Figure 9 is a top view schematic diagram of multiple battery cells electrically connected in a battery device disclosed in an embodiment of this application;

[0039] Figure 10 is a schematic diagram of the structure of a first busbar component disclosed in an embodiment of this application;

[0040] Figure 11 is a schematic diagram of another first busbar component disclosed in an embodiment of this application;

[0041] Figure 12 is a structural schematic diagram of another first busbar component disclosed in an embodiment of this application;

[0042] Figure 13 is a top view schematic diagram of another first busbar component disclosed in an embodiment of this application;

[0043] Figure 14 is a structural schematic diagram of another first busbar component disclosed in an embodiment of this application;

[0044] Figure 15 is a top view schematic diagram of another first busbar component disclosed in an embodiment of this application.

[0045] The accompanying drawings are not drawn to scale. Detailed Implementation

[0046] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0047] 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.

[0048] 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.

[0049] In this application, the reference to "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0054] 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.

[0055] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0056] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. 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, prevents short circuits while allowing active ions to pass through.

[0057] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0058] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0059] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0060] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0061] 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 connected in series, parallel, or mixed connections via a busbar.

[0062] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0063] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0064] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0065] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0066] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0067] 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.

[0068] 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.

[0069] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0070] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0071] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. To increase the capacity of a battery device, multiple cells within the device can be electrically connected in a parallel configuration. However, in the event of thermal runaway in one of these cells, which is typically equivalent to a very small resistor, the runaway cell is nearly short-circuited. The current flowing between the cells connected in parallel with this runaway cell is usually quite large, generating significant heat. This heat can then spread between the parallel cells, creating a safety hazard.

[0072] Therefore, embodiments of this application provide a battery device and an electrical appliance that can solve the above-mentioned problems. The battery device of this application includes a series-connected assembly of multiple battery cells, wherein the first battery cell assembly includes multiple battery cells connected in parallel, including a first battery cell and a second battery cell. The battery device also includes a current-limiting element located in the circuit formed by the first and second battery cells. Thus, in the event of thermal runaway in either the first or second battery cell, even if the thermally runaway battery cell is approximately short-circuited (equivalent to a resistor with very low resistance), the current in the circuit between the first and second battery cells is limited to prevent excessive current due to the current-limiting element in the parallel circuit, reducing the risk of short circuits, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0073] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0074] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0075] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0076] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle 1 according to an embodiment of this application, vehicle 1 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 is used to control the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0077] Figure 2 shows an exploded view of a partial structure of the battery device 10 according to an embodiment of this application. As shown in Figure 2, the battery device 10 according to this application embodiment may include multiple battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 according to this application embodiment can be set according to actual application. For example, the battery cell 20 may be a cylinder as shown in Figure 2, or it may be a cuboid or other shape different from that shown in Figure 2. This application embodiment is not limited to this.

[0078] It should be understood that, as shown in FIG2, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow internal structure, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as shown in FIG2, only one of the first housing portion 111 and the second housing portion 112 may be a hollow cuboid with an opening, while the other may be plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with an opening, and the first housing portion 111 as a plate as an example, the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing portion 111 and the second housing portion 112.

[0079] For example, unlike the case shown in Figure 2, the first box section 111 and the second box section 112 can both be hollow cuboids with one open side. The openings of the first box section 111 and the second box section 112 are arranged opposite to each other, and the first box section 111 and the second box section 112 are interlocked to form a box 11 with a closed cavity, which can be used to accommodate multiple battery cells 20.

[0080] Figure 3 shows a schematic diagram of the connection relationship between battery cells 20 in a battery device 10 according to an embodiment of this application. For example, Figure 3 can be a schematic diagram of the connection relationship between multiple battery cells 20 in the battery device 10 shown in Figure 2.

[0081] As shown in Figures 2 and 3, the battery device 10 of this application embodiment includes: a plurality of battery cell assemblies 200 connected in series and a current limiting element 12133. The first battery cell assembly 210 of the plurality of battery cell assemblies 200 includes a plurality of battery cells 20 connected in parallel. The plurality of battery cells 20 includes a first battery cell 201 and a second battery cell 202. The current limiting element 12133 is located on the circuit formed by the first battery cell 201 and the second battery cell 202.

[0082] It should be understood that the battery device 10 of this application embodiment may include a plurality of battery cell assemblies 200 connected in series. For example, each row in FIG3 may be a battery cell assembly 200. Each battery cell assembly 200 may include one or more battery cells 20, and the number of battery cells 20 included in different battery cell assemblies 200 may be the same or different. For example, as shown in FIG3, for ease of explanation, this application embodiment takes the example that the number of battery cells 20 in the plurality of battery cell assemblies 200 included in the battery device 10 is the same, but this application embodiment is not limited to this.

[0083] In some embodiments, the number of battery cells 20 connected in parallel in each battery cell assembly 200 can be set according to the actual application. For example, the number of battery cells 20 connected in parallel in each battery cell assembly 200 can be less than or equal to 10. Setting each battery cell assembly 200 to include two or more battery cells 20 connected in parallel can increase the capacity of the battery device 10. However, the parallel circuit is limited by the battery management system, charge and discharge control strategy, and safety factors, and the number of battery cells 20 connected in parallel in each battery cell assembly 200 should not be too large.

[0084] The first battery cell assembly 210 in this embodiment can be any one of the multiple battery cell assemblies 200 included in the battery device 10. FIG4 shows a schematic diagram of the first battery cell assembly 210 in this embodiment. For example, the first battery cell assembly 210 in FIG4 can be any one of the battery cell assemblies 200 included in the battery device 10 shown in FIG2 and FIG3. As shown in FIG4, the first battery cell assembly 210 can include multiple battery cells 20 connected in parallel. For example, FIG4 shows that the first battery cell assembly 210 includes five battery cells 20, but the embodiments of this application are not limited to this.

[0085] As shown in Figure 4, the plurality of battery cells 20 in the first battery cell assembly 210 includes a first battery cell 201 and a second battery cell 202. The first battery cell 201 and the second battery cell 202 can be any two battery cells 20 connected in parallel within the first battery cell assembly 210. For example, Figure 4 uses the middle battery cell 20 as an example of the first battery cell 201. The second battery cell 202 can be any one of the battery cells 20 connected in parallel with the first battery cell 201 within the first battery cell assembly 210. For example, Figure 4 uses the battery cell 20 on the right, closer to the first battery cell 201, as an example of the second battery cell 202. However, this embodiment is not limited to this.

[0086] It should be understood that the current limiting element 12133 in this embodiment is located on the circuit formed between the first battery cell 201 and the second battery cell 202. That is, the current limiting element 12133 can be located at any position on the circuit, and one or more current limiting elements 12133 can be provided on the circuit. For example, the circuit formed between the first battery cell 201 and the second battery cell 202 may include a busbar for connecting the positive or negative terminals of the two battery cells 20, and the current limiting element 12133 may be located on the busbar. As another example, the circuit formed between the first battery cell 201 and the second battery cell 202 may also include the two battery cells 20, in which case the current limiting element 12133 may also be located on the first battery cell 201 and / or the second battery cell 202. This embodiment is not limited to this.

[0087] In the embodiments of this application, when thermal runaway occurs in the first battery cell 201 or the second battery cell 202, for example, Figure 4 takes the thermal runaway of the first battery cell 201 as an example. Even if the thermally runaway first battery cell 201 is close to a short circuit, making it equivalent to a resistor with a very small resistance, the current limiting element 12133 is provided on the circuit of the parallel first battery cell 201 and the second battery cell 202. The current limiting element 12133 can limit the current in the circuit between the first battery cell 201 and the second battery cell 202 to not be too large, reduce the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device 10.

[0088] In some embodiments, the current limiting element 12133 of this application includes at least one of the following: a capacitor, a bonded resistor, a resistance wire, and a diaphragm resistor, to facilitate fabrication. For example, the current limiting element 12133 is typically a bonded resistor.

[0089] It should be understood that the resistance value of the current-limiting element 12133 in this application embodiment can be set according to actual application. For example, the sum of the resistance values ​​of all current-limiting elements 12133 set on the circuit formed by the first battery cell 201 and the second battery cell 202 can be in the range of [0.15Ω, 75Ω]. Specifically, at least one current-limiting element 12133 can be set on the circuit formed by the first battery cell 201 and the second battery cell 202, and the sum of the resistance values ​​of the at least one current-limiting element 12133 should not be too small. For example, the sum of the resistance values ​​is usually set to be greater than or equal to 0.15Ω. In the event of thermal runaway of the first battery cell 201 or the second battery cell 202, the short-circuit current of the circuit between the first battery cell 201 and the second battery cell 202 can be limited to not be too large, thereby reducing the risk of thermal diffusion of the battery device 10 and improving the reliability of the battery device 10. Conversely, the sum of the resistance values ​​of the at least one current-limiting element 12133 should not be too large. For example, the sum of the resistance values ​​is usually set to be less than or equal to 75Ω. Then, when a voltage difference occurs between the first battery cell 201 and the second battery cell 202 connected in parallel, the balancing current is small, and the battery device 10 can balance the voltage difference through self-balancing in a short time, which meets the design requirements.

[0090] It should be understood that the specific resistance value of the current limiting element 12133 in this application embodiment may be related to different application scenarios or different parameters of the battery device 10.

[0091] In some embodiments, the sum of the resistance values ​​of all current-limiting elements 12133 provided on the circuit formed by the first battery cell 201 and the second battery cell 202 can be related to the position of the first battery cell 201 and the second battery cell 202 in the battery device 10. For example, as shown in FIG3, taking the example that the number of current-limiting elements 12133 and the resistance values ​​of the parallel battery cells 20 in the same battery cell assembly 200 are the same, then for the first group of battery cell assemblies 200 connected to the positive output terminal of the battery device 10, the positive terminals of the multiple parallel battery cells 20 included in the first group of battery cell assemblies 200 can usually not be provided with current-limiting elements 12133 as shown in FIG3, or unlike FIG3, current-limiting elements 12133 with small resistance can also be provided between the positive terminals to reduce the impact on the positive output terminal of the battery device 10. Similarly, for the last group of battery cells 200 connected to the negative output terminal of the battery device 10, the negative terminals of the multiple parallel battery cells 20 included in the last group of battery cells 200 can usually not be provided with current limiting elements 12133 as shown in FIG3, or unlike FIG3, current limiting elements 12133 with small resistance can be provided between the negative terminals to reduce the impact on the negative output terminal of the battery device 10.

[0092] Specifically, as shown in Figure 3, if no current limiting element 12133 is provided between the positive terminals of the multiple parallel battery cells 20 included in the first group of battery cell assembly 200, and similarly, no current limiting element 12133 is provided between the negative terminals of the multiple parallel battery cells 20 included in the last group of battery cell assembly 200, then the resistance values ​​of the current limiting elements 12133 provided between the negative terminals of the multiple parallel battery cells 20 included in the first group of battery cell assembly 200 and the current limiting elements 12133 provided between the positive terminals of the multiple parallel battery cells 20 included in the last group of battery cell assembly 200 are relatively large, at least greater than the resistance values ​​of the current limiting elements 12133 provided in the other battery cell assembly 200, while the resistance values ​​of the current limiting elements 12133 provided in the other battery cell assembly 200 can be the same. Furthermore, according to the connection relationship shown in Figure 3, for the second group of battery cell assembly 200 which is adjacent to and connected in series with the first group of battery cell assembly 200, the positive terminals of the multiple parallel battery cells 20 included therein can share the current limiting element 12133 with the negative terminals of the multiple parallel battery cells 20 included in the first group of battery cell assembly 200; similarly, for the penultimate group of battery cell assembly 200 which is adjacent to and connected in series with the last group of battery cell assembly 200, the negative terminals of the multiple parallel battery cells 20 included therein can share the current limiting element 12133 with the positive terminals of the multiple parallel battery cells 20 included in the last group of battery cell assembly 200.

[0093] Alternatively, if a current-limiting element 12133 is provided between the positive terminals of the multiple parallel battery cells 20 included in the first group of battery cell assembly 200, similarly, a current-limiting element 12133 can also be provided between the negative terminals of the multiple parallel battery cells 20 included in the last group of battery cell assembly 200. In this case, the resistance values ​​of the current-limiting elements 12133 provided between the positive terminals of the multiple parallel battery cells 20 included in the first group of battery cell assembly 200 and the current-limiting elements 12133 provided between the negative terminals of the multiple parallel battery cells 20 included in the last group of battery cell assembly 200 are relatively small, at least smaller than the resistance values ​​of the current-limiting elements 12133 provided in the other battery cell assemblies 200, while the resistance values ​​of the current-limiting elements 12133 provided in the other battery cell assemblies 200 can be the same.

[0094] In some embodiments, the sum of the resistance values ​​of at least one current-limiting element 12133 in the circuits of the first battery cell 201 and the second battery cell 202 may be related to the mass and / or capacity of the first battery cell 201, and / or to the mass and / or capacity of the second battery cell 202. In some embodiments, the mass of the first battery cell 201 and the mass of the second battery cell 202 may be the same or different. The capacity of the first battery cell 201 and the capacity of the second battery cell 202 may be the same or different.

[0095] In some embodiments, the first battery cell 201 and the second battery cell 202 satisfy at least one of the following conditions: the capacity of the first battery cell 201 is in the range of [20Ah, 88Ah]; the capacity of the second battery cell 202 is in the range of [20Ah, 88Ah]; the mass of the first battery cell 201 is in the range of [0.37kg, 1.6kg]; and the mass of the second battery cell 202 is in the range of [0.37kg, 1.6kg]. When the first battery cell 201 and the second battery cell 202 satisfy any of the above conditions, the sum of the resistance values ​​of at least one current-limiting element 12133 in the circuit of the first battery cell 201 and the second battery cell 202 can be set to be in the range of [0.075Ω, 37.5Ω], so that the current in the circuit of the first battery cell 201 and the second battery cell 202 meets the design requirements.

[0096] It should be understood that, for different models of battery cells 20, the sum of the resistance values ​​of at least one current-limiting element 12133 in the circuits of the first battery cell 201 and the second battery cell 202 can be appropriately adjusted to improve the reliability of the battery device 10. The following will describe this in conjunction with specific embodiments.

[0097] In some embodiments, the capacity range of the first battery cell 201 and the capacity range of the second battery cell 202 are both [35Ah, 50Ah]; the mass range of the first battery cell 201 and the mass range of the second battery cell 202 are both [0.25kg, 0.75kg]; and the sum of the resistance values ​​of all current limiting elements 12133 provided on the circuit formed by the first battery cell 201 and the second battery cell 202 is [0.28Ω, 30Ω].

[0098] In some embodiments, the capacity range of the first battery cell 201 and the capacity range of the second battery cell 202 are both [15Ah, 30Ah]; the mass range of the first battery cell 201 and the mass range of the second battery cell 202 are both [0.27kg, 0.78kg]; and the sum of the resistance values ​​of all current limiting elements 12133 provided on the circuit formed by the first battery cell 201 and the second battery cell 202 is [0.25Ω, 60Ω].

[0099] In some embodiments, the capacity range of the first battery cell 201 and the capacity range of the second battery cell 202 are both [9Ah, 23Ah]; the mass range of the first battery cell 201 and the mass range of the second battery cell 202 are both [0.13kg, 0.6kg]; and the sum of the resistance values ​​of all current limiting elements 12133 provided on the circuit formed by the first battery cell 201 and the second battery cell 202 is [0.3Ω, 75Ω].

[0100] In some embodiments, the capacity range of the first battery cell 201 and the capacity range of the second battery cell 202 are both [12Ah, 30Ah]; the mass range of the first battery cell 201 and the mass range of the second battery cell 202 are both [0.28kg, 0.52kg]; and the sum of the resistance values ​​of all current limiting elements 12133 provided on the circuit formed by the first battery cell 201 and the second battery cell 202 is [0.28Ω, 60Ω].

[0101] In some embodiments, the capacity range of the first battery cell 201 and the capacity range of the second battery cell 202 are both [73Ah, 102Ah]; the mass range of the first battery cell 201 and the mass range of the second battery cell 202 are both [1.1kg, 2.1kg]; and the sum of the resistance values ​​of all current limiting elements 12133 provided on the circuit formed by the first battery cell 201 and the second battery cell 202 is [0.15Ω, 15Ω].

[0102] In the above embodiments, for battery cells 20 of different quality and battery cells of different capacity, the range of the sum of the resistance values ​​of at least one current limiting element 12133 on the circuit of the first battery cell 201 and the second battery cell 202 can be appropriately adjusted. This can better balance the different design requirements of the current on the circuit of the first battery cell 201 and the second battery cell 202 under normal use of the battery device 10 and under thermal runaway of any one of the battery cells 20, thereby improving the reliability of the battery device 10.

[0103] Figure 5 shows a schematic diagram of the structure of a battery cell 20 according to an embodiment of this application. For example, Figure 5 can be a schematic diagram of the structure of a battery cell 20 during normal use, and the battery cell 20 shown in Figure 5 can be any one of the battery cells 20 included in the battery device 10 of this application, such as the first battery cell 201 and the second battery cell 202. Figure 6 shows a partial exploded view of the structure of a battery cell 20 according to an embodiment of this application. For example, the battery cell 20 shown in Figure 6 can be a partial exploded view of the structure of the battery cell 20 shown in Figure 5. Figure 7 shows a partial cross-sectional view of a battery cell 20 according to an embodiment of this application. For example, the battery cell 20 shown in Figure 7 can be the battery cell 20 shown in Figures 5 and 6.

[0104] It should be understood that the battery cell 20 in this application embodiment can be a cylindrical battery cell, a prismatic battery cell, a pouch battery, or a battery cell of other shapes. Among them, the prismatic battery cell can include a prismatic battery cell, a blade-shaped battery cell, or other multi-prismatic battery cells, such as a hexagonal prismatic battery cell or an octagonal prismatic battery cell, and this application embodiment is not limited to these.

[0105] As shown in Figures 5 to 7, this embodiment mainly uses a cylindrical battery cell 20 as an example. For battery cells 20 with different parameters, the sum of the resistance values ​​of at least one current-limiting element 12133 in the circuits of the first battery cell 201 and the second battery cell 202 can be adjusted to improve the reliability of the battery device 10. Specifically, this embodiment uses the parameters of the first battery cell 201 and the second battery cell 202 as shown in Table 1 below as an example. As shown in Figure 7, the diameter represents the outer diameter D of the outer casing 21 of the battery cell 20; the length represents the height L of the outer casing 21 of the battery cell 20.

[0106] Table 1

[0107] As shown in Table 1, in the above embodiments, different current-limiting elements 12133 with different resistance values ​​can be set for different types of battery cells 20. This ensures that when a voltage difference occurs between the first battery cell 201 and the second battery cell 202 connected in parallel, the balancing current is small, and the battery device 10 can balance the voltage difference through self-balancing in a short time, meeting the design requirements. In the event of thermal runaway of the first battery cell 201 or the second battery cell 202, even if the thermally runaway battery cell 20 itself is approximately short-circuited, making it equivalent to a resistor with a very small resistance value, the current-limiting element 12133 with a certain resistance value is set on the circuit of the first battery cell 201 and the second battery cell 202 connected in parallel. Therefore, the current in the circuit between the first battery cell 201 and the second battery cell 202 can be limited to prevent it from becoming too large, reducing the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device 10.

[0108] It should be understood that the specific structure of the battery cell 20 in this application embodiment can be set according to actual application. The following will be introduced with reference to Figures 5 to 7, taking the cylindrical battery cell 20 as an example.

[0109] In this embodiment, the battery cell 20 includes a housing 21, which includes a first wall 2101. Specifically, the housing 21 can be a hollow polyhedral structure, and the housing 21 includes multiple walls, with the first wall 2101 being any one of the walls of the housing 21. For example, as shown in Figures 5 to 7, taking a cylindrical battery cell 20 as an example, the housing 21 can include three walls. Here, the first wall 2101 is taken as the top wall of the cylinder, but this embodiment is not limited to this.

[0110] In this embodiment, the outer casing 21 includes: a shell 211 with a hollow structure having an opening 2111; and a cover plate 212 for covering the opening 2111 to facilitate processing. Corresponding to different shapes of battery cells 20, the shell 211 of the battery cell 20 can have various shapes, such as a cylindrical or polygonal prism shape. The shell 211 can be a hollow structure with an opening 2111 at one or more ends. For example, if the shell 211 is a hollow structure with openings 2111 at opposite ends, two cover plates 212 can be provided, each covering the opening at one end of the shell 211; as shown in Figures 5 to 7, if the shell 211 is a hollow structure with an opening 2111 at one end, one cover plate 212 can be provided accordingly.

[0111] It should be understood that the cover plate 212 in this embodiment is used to cover the opening 2111 of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 can be adapted to the shape of the housing 211. For example, the housing 211 is a cuboid structure, and the cover plate 212 is a rectangular plate structure adapted to the housing 211; or, as shown in Figures 5 to 7, the housing 211 is a cylindrical structure, and the cover plate 212 is a circular plate structure adapted to the housing 211.

[0112] The battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used to electrically connect with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Furthermore, the battery cell 20 may include at least one electrode terminal 214, which includes at least one positive electrode terminal and / or at least one negative electrode terminal. If the battery cell 20 includes only at least one positive electrode terminal or only at least one negative electrode terminal, it can be electrically connected to the tabs 222 of the electrode assembly 22 through the housing 21, so that the housing 21 can output electrical energy in place of another electrode terminal with opposite polarity.

[0113] In this embodiment, taking the electrode terminal 214 disposed on the first wall 2101 of the battery cell 20 as an example, the electrode terminal 214 can be a positive electrode terminal or a negative electrode terminal. The first wall 2101 can be any wall of the battery cell 20. In some embodiments, the cover plate 212 of this embodiment may include the first wall 2101 to facilitate processing.

[0114] Furthermore, the battery cell 20 also includes an insulating structure 24 disposed between the electrode terminal 214 and the first wall 2101, used to isolate the electrode terminal 214 from the first wall 2101 in the event of thermal runaway of the battery cell 20. For example, taking the first battery cell 201 as an example, the insulating structure 24 of the first battery cell 201 is located between the electrode terminal 214 and the first wall 2101, so that the electrode terminal 214 and the first wall 2101 are electrically insulated. In addition, in the event of thermal runaway of the first battery cell 201, the insulating structure 24 of the first battery cell 201 can also be used to isolate the electrode terminal 214 from the first wall 2101, so that the electrode terminal 214 and the first wall 2101 are still electrically insulated, thereby reducing the risk of short circuit, causing the first battery cell 201 to form an open circuit, increasing the resistance of the thermally runaway first battery cell 201, and thus increasing the total current limiting element Rp in the circuit formed by the first battery cell 201 and the second battery cell 202.

[0115] In this embodiment, the insulation structure 24 can also be used to isolate other components to reduce the risk of short circuits in the thermally runaway battery cell 20 itself.

[0116] Figure 8 shows another partial cross-sectional schematic diagram of the battery cell 20 according to an embodiment of this application. For example, the battery cell 20 shown in Figure 8 can be another possible structure of the battery cell 20 shown in Figures 5 and 6.

[0117] As shown in Figures 5 to 8, the battery cell 20 also includes an electrode assembly 22, which is housed within the casing 21. In this battery cell 20, the electrode assembly 22 is the component where the electrochemical reaction occurs. Depending on the actual application requirements, the battery cell 20 may contain one or more electrode assemblies 22. The electrode assembly 22 can be cylindrical, cuboid, etc. For example, if the electrode assembly 22 is cylindrical, the casing 211 can also be cylindrical; if the electrode assembly 22 is cuboid, the casing 211 can also be cuboid.

[0118] It should be understood that, as shown in Figures 5 to 8, the electrode assembly 22 of this application embodiment may include tabs 222 and an electrode body 221. The tabs 222 of the electrode assembly 22 may include positive tabs and negative tabs. The positive tab may be formed by stacking the portions of the positive electrode sheet that are not coated with positive active material, and the negative tab may be formed by stacking the portions of the negative electrode sheet that are not coated with negative active material. The electrode body 221 may be formed by stacking or winding the positive and negative electrode sheets together.

[0119] In this embodiment, the positive electrode terminal is used for electrical connection to the positive electrode tab of the electrode assembly 22, and the negative electrode terminal is used for electrical connection to the negative electrode tab of the electrode assembly 22. The positive electrode terminal and the positive electrode tab can be directly connected or indirectly connected, and the negative electrode terminal and the negative electrode tab can be directly connected or indirectly connected. For example, the positive electrode terminal can be electrically connected to the positive electrode tab through a connecting member 23, and the negative electrode terminal can be electrically connected to the negative electrode tab through a connecting member 23.

[0120] For example, the battery cell 20 further includes a connecting member 23 for electrically connecting the electrode terminal 214 and the first tab 2221 of the electrode assembly 22; wherein, if the electrode terminal 214 is a positive electrode terminal, the first tab 2221 is a positive tab; if the electrode terminal 214 is a negative electrode terminal, the first tab 2221 is a negative tab.

[0121] In some embodiments, the insulating structure 24 is also located between the connecting member 23 and the first wall 2101, for isolating the connecting member 23 and the first wall 2101 in the event of thermal runaway of the battery cell 20. For example, taking the first battery cell 201 as an example, the insulating structure 24 is also disposed between the connecting member 23 and the first wall 2101 to make the connecting member 23 electrically insulated from the first wall 2101. Furthermore, in the event of thermal runaway of the first battery cell 201, the insulating structure 24 of the first battery cell 201 can also be used to isolate the connecting member 23 from the first wall 2101, so that the connecting member 23 and the first wall 2101 still maintain electrical insulation, reducing the risk of short circuit between the connecting member 23 and the first wall 2101, causing the first battery cell 201 to form an open circuit, increasing the resistance of the thermally runaway first battery cell 201, and thus increasing the total current limiting element Rp on the circuit formed by the first battery cell 201 and the second battery cell 202.

[0122] In some embodiments, the battery device 10 further includes a third busbar 123, which is used for electrical connection with electrode terminals 214. For example, the third busbar 123 is connected to the electrode terminals 214 to enable the battery cell 20 to be connected in series and / or in parallel with other battery cells 20. Taking the first battery cell 201 as an example, the third busbar 123 can be used to electrically connect to the electrode terminals 214 of the first battery cell 201 to enable the first battery cell 201 to be connected in series and / or in parallel with other battery cells 20. For example, the third busbar 123 can be used to electrically connect the electrode terminals 214 of the first battery cell 201 and the electrode terminals 214 of the second battery cell 202 with the same polarity to enable the first battery cell 201 and the second battery cell 202 to be connected in parallel. For example, the third bus component 123 can also be used to electrically connect the electrode terminals 214 of the first battery cell 201 and the third battery cell 203 with different polarities. The third battery cell 203 and the first battery cell 201 can belong to different battery cell assemblies 200 to realize the series connection between the first battery cell 201 and the third battery cell 203.

[0123] In this embodiment, the insulating structure 24 is also located between the first wall 2101 and the third busbar 123, for isolating the first wall 2101 and the third busbar 123 in the event of thermal runaway of the first battery cell 201. For example, taking the first battery cell 201 as an example, the insulating structure 24 is also disposed between the third busbar 123 and the first wall 2101, so that the third busbar 123 is electrically insulated from the first wall 2101. Furthermore, in the event of thermal runaway of the first battery cell 201, the insulation structure 24 of the first battery cell 201 can also be used to isolate the third busbar 123 from the first wall 2101, so that the third busbar 123 and the first wall 2101 remain electrically insulated, reducing the risk of short circuit between the third busbar 123 and the first wall 2101, causing the first battery cell 201 to form an open circuit, thereby increasing the resistance of the thermally runaway first battery cell 201, and thus increasing the total current limiting element Rp on the circuit formed by the first battery cell 201 and the second battery cell 202.

[0124] In some embodiments, as shown in FIG8, the insulating structure 24 can be an integral structure. Considering that electrical insulation between the electrode terminal 214 and the first wall 2101 needs to be achieved through the insulating structure 24, and that the connecting member 23 and the third busbar component 123 are usually located close to the electrode terminal 214, an integral insulating structure 24 can be provided to simultaneously achieve electrical insulation between the electrode terminal 214 and the first wall 2101, between the connecting member 23 and the first wall 2101, and between the third busbar component 123 and the first wall 2101, thereby simplifying the structure and facilitating manufacturing. Alternatively, unlike that shown in FIG8, the insulating structure 24 can also be a split structure, to be respectively disposed between the electrode terminal 214 and the first wall 2101, between the connecting member 23 and the first wall 2101, and between the third busbar component 123 and the first wall 2101. The embodiments of this application are not limited to this.

[0125] It should be understood that the material of the insulation structure 24 in the embodiments of this application can be set according to actual applications to reduce the risk of insulation failure of the insulation structure 24 in the event of thermal runaway of the battery cell 20.

[0126] In some embodiments, the melting point of the insulating structure 24 is greater than or equal to 400°C, so as to reduce the risk of the insulating structure 24 melting in the event of thermal runaway of the battery cell 20, thereby reducing the risk of insulation failure between the connecting member 23 and the first wall 2101.

[0127] In some embodiments, the material of the insulating structure 24 includes inorganic materials and / or high-temperature resistant polymers to make the insulating structure 24 less prone to melting, but the embodiments of this application are not limited thereto.

[0128] In some embodiments, the material of the insulating structure 24 includes at least one of the following: ceramic, glass fiber, and polytetrafluoroethylene. These materials are readily available to meet design requirements, are not easily melted, and are easy to implement and process.

[0129] It should be understood that the aforementioned electrode terminal 214 can be any one of the electrode terminals 214 included in the battery cell 20. The battery cell 20 can also output electrical energy through the casing 21 instead of another electrode terminal with opposite polarity, or the battery cell 20 can also include another electrode terminal with opposite polarity.

[0130] In some embodiments, the second tab 2222 of the electrode assembly 22 is electrically connected to the first wall 2101, and the second tab 2222 has the opposite polarity to the first tab 2221. Specifically, as shown in Figures 5 to 8, the battery cell 20 may include only one electrode terminal 214, and the first wall 2101 may act as another electrode terminal with the opposite polarity to the electrode terminal 214 and be used for electrical connection with other battery cells 20. This simplifies the structure of the battery cell 20 and reduces the number of electrode terminals 214. In addition, taking the first battery cell 201 as an example, in the event of thermal runaway of the first battery cell 201, the insulating structure 24 can isolate the electrode terminal 214 from the first wall 2101, and can also isolate the connecting member 23 from the first wall 2101, as well as the third bus member 123 from the first wall 2101, so that these structures are electrically insulated from the first wall 2101, reducing the risk of short circuit between these structures and the first wall 2101, causing the first battery cell 201 to form an open circuit, increasing the resistance of the thermally runaway first battery cell 201, and thus increasing the total current limiting element Rp in the circuit formed by the first battery cell 201 and the second battery cell 202.

[0131] In some embodiments, unlike the battery cell 20 shown in Figures 5 to 8, the battery cell 20 may also be provided with another electrode terminal with the opposite polarity to the electrode terminal 214 described above, so as to realize the electrical connection between the battery cell 20 and other battery cells 20. Furthermore, the structure of this other electrode terminal can be the same as that of the electrode terminal 214 in the embodiments of this application, in order to facilitate processing.

[0132] Specifically, for ease of distinction, taking the aforementioned electrode terminal 214 as an example of the first electrode terminal, the battery cell 20 also includes a second electrode terminal. This second electrode terminal can be disposed on the second wall of the housing 21, and the polarity of the second electrode terminal is opposite to that of the first electrode terminal. In this embodiment, the second wall can be any wall of the battery cell 20, and the second wall can be the same wall as the first wall 2101 or a different wall.

[0133] In some embodiments, the second wall and the first wall 2101 are different walls. For example, the first wall 2101 and the second wall may intersect or be disposed opposite to each other. Alternatively, the second wall may be the same wall as the first wall 2101, that is, multiple electrode terminals are disposed on the first wall 2101.

[0134] The battery cell 20 may also include another insulating structure disposed between the second electrode terminal and the second wall, so as to electrically insulate the second electrode terminal from the second wall and isolate the second electrode terminal from the second wall in the event of thermal runaway of the battery cell 20, thereby maintaining electrical insulation between the second electrode terminal and the second wall.

[0135] In some embodiments, the other insulating structure disposed between the second electrode terminal and the second wall may be disposed in a manner similar to the insulating structure 24 described above. For the sake of brevity, it will not be described in detail here.

[0136] The structure of the battery cell 20 according to the embodiments of this application has been described above with reference to the accompanying drawings. The arrangement of the current limiting element 12133 according to the embodiments of this application will now be described with reference to the accompanying drawings.

[0137] It should be understood that the position of the current limiting element 12133 in this application embodiment can be set according to actual application.

[0138] Figure 9 shows a top view of a plurality of battery cells 20 electrically connected within the battery device 10 according to an embodiment of this application. For example, Figure 9 may be a top view of a partial structure of the battery device 10 shown in Figure 2. Figure 10 shows a structural schematic diagram of the first busbar component 121 according to an embodiment of this application. For example, the first busbar component 121 shown in Figure 10 may be an enlarged view of the first busbar component 121 included in the battery device 10 shown in Figure 9.

[0139] In this embodiment, the battery device 10 includes: a first busbar 121 for connecting the positive electrode of a first battery cell 201 and the positive electrode of a second battery cell 202; and a second busbar 122 for connecting the negative electrode of the first battery cell 201 and the negative electrode of the second battery cell 202; wherein at least one of the first busbar 121 and the second busbar 122 includes a current limiting element 12133. For any two battery cells 20 connected in parallel in the battery device 10 of this embodiment, any busbar used to achieve the parallel connection can be provided with a current limiting element 12133, so as to be flexibly applied in different battery devices 10. For example, the first busbar 121 used to connect the positive electrode can be provided with a current limiting element 12133, while the second busbar 122 used to connect the negative electrode may not be provided with a current limiting element 12133. For example, the first busbar 121 used to connect to the positive terminal may not have a current limiting element 12133, while the second busbar 122 used to connect to the negative terminal may have a current limiting element 12133. Alternatively, both the first busbar 121 and the second busbar 122 may have a current limiting element 12133.

[0140] If only one of the first busbar component 121 and the second busbar component 122 is equipped with a current-limiting element 12133, the number of busbar components with current-limiting elements 12133 within the battery device 10 can be reduced, thereby reducing the structural complexity of the battery device 10, facilitating its processing and assembly, and improving its processing efficiency. If both the first busbar component 121 and the second busbar component 122 are equipped with current-limiting elements 12133, the reliability of the battery device 10 can be improved.

[0141] In some embodiments, for the same battery cell assembly 200, taking the first battery cell assembly 210 as an example, for the multiple battery cells 20 connected in parallel within the first battery cell assembly 210, the first battery cell assembly 210 has one or more first busbars 121 for connecting to the positive electrode and one or more second busbars 122 for connecting to the negative electrode. For these first busbars 121 and second busbars 122, only all first busbars 121 may have a current-limiting element 12133, or only all second busbars 122 may have a current-limiting element 12133; or both first busbars 121 and second busbars 122 may have a current-limiting element 12133; or some first busbars 121 and some second busbars 122 may have a current-limiting element 12133. The embodiments of this application are not limited to these.

[0142] Similarly, for different battery cell assemblies 200, the arrangement of the multiple first busbars 121 used to connect to the positive electrode can be the same or different, and the arrangement of the multiple second busbars 122 used to connect to the negative electrode can be the same or different. For example, taking the battery cells 20 connected in parallel within the first battery cell assembly 210 as an example, if only the first busbar 121 used to connect to the positive electrode has a current limiting element 12133, then for the battery cells 20 connected in parallel within other battery cell assemblies 200, the arrangement can be the same as that of the first battery cell assembly 210, that is, only the first busbar 121 used to connect to the positive electrode has a current limiting element 12133; or it can be different from the arrangement of the first battery cell assembly 210, for example, only the second busbar 122 used to connect to the negative electrode has a current limiting element 12133, or all busbars used to connect to the positive and negative electrodes have a current limiting element 12133. The embodiments of this application are not limited to this.

[0143] For ease of explanation, as shown in Figures 9 and 10, the following description mainly uses the first busbar 121 with the current limiting element 12133 as an example. However, the same description applies to the second busbar 122 with the current limiting element 12133, and will not be repeated here.

[0144] In this embodiment of the application, at least one of the first busbar component 121 and the second busbar component 122 includes a current limiting element 12133. Each of the at least one busbar component includes a first connection portion 1211, a second connection portion 1212, and a safety portion 1213. The first connection portion 1211 is used to connect to the first battery cell 201, the second connection portion 1212 is used to connect to the second battery cell 202, and the safety portion 1213 is located between the first connection portion 1211 and the second connection portion 1212. The safety portion 1213 includes the current limiting element 12133.

[0145] As shown in Figures 9 and 10, taking the first busbar component 121 as an example, the plurality of battery cells 20 in the first battery cell assembly 210 include a first battery cell 201 and a second battery cell 202. The first busbar component 121 of the battery device 10 is used to connect the first battery cell 201 and the second battery cell 202 in parallel. The first battery cell 201 and the second battery cell 202 are any two battery cells in the first battery cell assembly 210 that are connected in parallel through the same first busbar component 121.

[0146] The first busbar component 121 of this application embodiment includes a first connecting portion 1211, a second connecting portion 1212, and a safety portion 1213. The first connecting portion 1211 is used to connect to a first battery cell 201, for example, to the positive terminal of the first battery cell 201. The second connecting portion 1212 is used to connect to a second battery cell 202, for example, to the positive terminal of the second battery cell 202, thereby enabling the first battery cell 201 and the second battery cell 202 to be connected in parallel. Similarly, the second busbar component 122 may also include a first connecting portion 1211, a second connecting portion 1212, and a safety portion 1213. The first connecting portion 1211 is used to connect to the first battery cell 201, for example, to the negative terminal of the first battery cell 201. The second connecting portion 1212 is used to connect to the second battery cell 202, for example, to the negative terminal of the second battery cell 202, thereby enabling the first battery cell 201 and the second battery cell 202 to be connected in parallel.

[0147] In this embodiment, the safety element 1213 is located between the first connecting portion 1211 and the second connecting portion 1212, and the safety element 1213 includes a current-limiting element 12133. Thus, taking the case of thermal runaway in the first battery cell 201 as an example, even if the first battery cell 201 itself is approximately short-circuited, making it equivalent to a current-limiting element with a very small resistance, the presence of the safety element 1213, including the current-limiting element 1213, between the parallel-connected first battery cell 201 and the second battery cell 202 effectively increases the resistance of the circuit formed by the first battery cell 201 and the second battery cell 202. This prevents the current in the circuit between the first battery cell 201 and the second battery cell 202 from becoming excessive, reducing the risk of short circuits, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device 10.

[0148] It should be understood that the safety unit 1213 in this application embodiment is provided with a current limiting element 12133. As described above, the specific resistance value of the current limiting element 12133 can be set according to the actual application, and will not be repeated here.

[0149] It should be understood that the specific structure of the security unit 1213 in this application embodiment can be set according to actual application.

[0150] In some embodiments, the safety unit 1213 further includes a first connection structure 12131 and a second connection structure 12132. The first connection structure 12131 is used to connect the first connection portion 1211 and the current limiting element 12133, and the second connection structure 12132 is used to connect the second connection portion 1212 and the current limiting element 12133, so as to connect the first battery cell 201 and the second battery cell 202 in parallel. For example, as shown in FIG10, the first connection structure 12131 can be a connecting wire; and / or, the second connection structure 12132 can be a connecting wire to facilitate processing.

[0151] It should be understood that the number of first connecting structures 12131 in this embodiment can be set according to actual application, and the number of second connecting structures 12132 can also be set according to actual application. Furthermore, the number of first connecting structures 12131 can be the same as or different from the number of second connecting structures 12132. In addition, the number of both first connecting structures 12131 and second connecting structures 12132 should not be excessive to limit processing difficulty.

[0152] Figure 11 shows another structural schematic diagram of the first busbar component 121 according to an embodiment of this application. For example, the first busbar component 121 shown in Figure 11 can be another possible implementation of the first busbar component 121 included in the battery device 10 shown in Figure 9.

[0153] In some embodiments, the safety unit 1213 includes a plurality of first connecting structures 12131 spaced apart; and / or, the safety unit 1213 includes a plurality of second connecting structures 12132 spaced apart. By providing a plurality of first connecting structures 12131, the connection strength between the first connecting portion 1211 and the current limiting element 12133 can be improved. By providing a plurality of second connecting structures 12132, the connection strength between the second connecting portion 1212 and the current limiting element 12133 can be improved, thereby improving the stability of the safety unit 1213. For example, as shown in FIG11, the safety unit 1213 may include three first connecting structures 12131 spaced apart and three second connecting structures 12132 spaced apart, which can improve structural strength and stability and facilitate processing.

[0154] In some embodiments, the safety part 1213 is fixed to the first connecting part 1211 by welding; and / or, the safety part 1213 is fixed to the second connecting part 1212 by welding, to facilitate processing. For example, the first connecting part 1211 can be fixed to the first connecting structure 12131 by welding; as another example, the second connecting part 1212 can also be fixed to the second connecting structure 12132 by welding, which can both improve the connection strength and facilitate processing.

[0155] It should be understood that, since the size of the current-limiting element 12133 of the safety unit 1213 is usually smaller than the size of the first connecting part 1211 and the second connecting part 1212, for example, the thickness of the current-limiting element 12133 is usually smaller than the thickness of the first connecting part 1211 and the second connecting part 1212, the structural strength of the first connecting structure 12131 and the second connecting structure 12132 is limited. Therefore, during the use or transportation of the battery device 10, if a collision occurs, the safety unit 1213 may break between the first connecting part 1211 or between the safety unit 1213 and the second connecting part 1212, thereby reducing the reliability of the battery device 10 and causing a safety accident. Therefore, the first busbar component 121 of this embodiment may also be provided with a protective component 1214 to protect the safety unit 1213.

[0156] Figure 12 shows a structural schematic diagram of the first busbar component 121 according to another embodiment of this application; Figure 13 shows a top view of the first busbar component 121 according to another embodiment of this application, which can be a top view of the first busbar component 121 shown in Figure 12. The first busbar component 121 shown in Figures 12 and 13 can be another possible implementation of the first busbar component 121 included in the battery device 10 shown in Figure 9.

[0157] It should be understood that the first busbar component 121 in this embodiment further includes a protective component 1214, which protects the connection between the first connecting portion 1211 and the safety portion 1213, and / or the connection between the second connecting portion 1212 and the safety portion 1213. The protective component 1214 can improve the structural strength of the connection between the first connecting portion 1211 and the safety portion 1213, and also improve the structural strength of the connection between the second connecting portion 1212 and the safety portion 1213. This reduces the risk of breakage between the safety portion 1213 and the first connecting portion 1211 and / or between the safety portion 1213 and the second connecting portion 1212 during the use or transportation of the battery device 10, such as in the event of a collision, thereby improving the reliability of the battery device 10.

[0158] It should be understood that the specific location of the protective component 1214 in this application embodiment can be set according to actual application. In some embodiments, as shown in FIG12 and FIG13, the protective component 1214 covers at least: the area of ​​the first connecting portion 1211 near the safety portion 1213 and the area of ​​the safety portion 1213 near the first connecting portion 1211. For example, the protective component 1214 can be used to cover the area of ​​the first connecting portion 1211 near the safety portion 1213 and the first connecting structure 12131 to improve the structural strength of the connection between the first connecting portion 1211 and the safety portion 1213.

[0159] In some embodiments, as shown in Figures 12 and 13, the protective member 1214 covers at least the area of ​​the second connecting portion 1212 near the safety portion 1213 and the area of ​​the safety portion 1213 near the second connecting portion 1212. For example, the protective member 1214 can be used to cover the area of ​​the second connecting portion 1212 near the safety portion 1213 and the second connecting structure 12132 to improve the structural strength of the connection between the second connecting portion 1212 and the safety portion 1213.

[0160] Figure 14 shows a structural schematic diagram of the first busbar component 121 according to another embodiment of the present application; Figure 15 shows a top view of the first busbar component 121 according to another embodiment of the present application, which can be a top view of the first busbar component 121 shown in Figure 14. The first busbar component 121 shown in Figures 14 and 15 can be another possible implementation of the first busbar component 121 included in the battery device 10 shown in Figure 9.

[0161] In some embodiments, as shown in Figures 14 and 15, the protective member 1214 covers the area of ​​the safety part 1213, the area of ​​the first connecting part 1211 near the safety part 1213, and the area of ​​the second connecting part 1212 near the safety part 1213. Unlike the first busbar member 121 shown in Figures 12 and 13, the protective member 1214 can also be used to cover the entire safety part 1213 to protect it.

[0162] It should be understood that the protective component 1214 covering the corresponding area in this embodiment of the application means that the protective component 1214 covers all or most of the surface of the corresponding area to improve the reliability of the structure.

[0163] In this embodiment, the protective component 1214 is fixed to at least one of the first connecting part 1211, the second connecting part 1212, and the safety part 1213 by hot melting and / or casting. That is, the protective component 1214 can be used by hot melting and / or casting to cover the corresponding area. The processing method is simple and easy to implement.

[0164] It should be understood that the material of the protective component 1214 in this application embodiment can be set according to the actual application. For example, the material of the protective component 1214 includes at least one of the following: polypropylene (PP), polyimide (PI), and meltable polytetrafluoroethylene (PFA), so as to facilitate processing and improve structural reliability and meet design requirements.

[0165] It should be understood that the first busbar component 121 in this application embodiment can be used to connect to the positive electrode of the first battery cell 201, and the second busbar component 122 can be used to be the same as the negative electrode of the first battery cell 201. The structures of the positive and negative electrodes of the first battery cell 201 can be implemented in a variety of ways.

[0166] In some embodiments, as shown in Figures 4 to 7, the battery cell 20 may include only one electrode terminal 214, and the first wall 2101 may serve as another electrode terminal with the opposite polarity to the electrode terminal 214, and be used for electrical connection with other battery cells 20. This simplifies the structure of the battery cell 20 and reduces the number of electrode terminals 214. For example, if the electrode terminal 214 is the positive electrode of the battery cell 20, then the first wall 2101 may be the negative electrode of the battery cell 20; or, if the electrode terminal 214 is the negative electrode of the battery cell 20, then the first wall 2101 may be the positive electrode of the battery cell 20.

[0167] In this embodiment of the application, the first connecting portion 1211 of the first busbar component 121 is used to connect to the positive electrode of the first battery cell 201, and the second busbar component 122 is used to connect to the negative electrode of the first battery cell 201. For example, if the first connecting portion 1211 is connected to the electrode terminal 214, then the second busbar component 122 is connected to the first wall 2101; or, if the first connecting portion 1211 is connected to the first wall 2101, then the second busbar component 122 is connected to the electrode terminal 214.

[0168] Taking an example where the electrode terminals 214 of the first battery cell 201 and the second battery cell 202 are both positive terminals, and the first wall 2101 of the first battery cell 201 and the first wall 2101 of the second battery cell 202 are both negative terminals, the first busbar 121 is used to connect the electrode terminals 214 of the first battery cell 201 and the second battery cell 202. Specifically, the first connecting portion 1211 of the first busbar 121 is connected to the electrode terminal 214 of the first battery cell 201, and the second connecting portion 1212 of the first busbar 121 is connected to the electrode terminal 214 of the second battery cell 202, so as to connect the first battery cell 201 and the second battery cell 202 in parallel. The second busbar component 122 can be used to connect the first wall 2101 of the first battery cell 201 and the first wall 2101 of the second battery cell 202. That is, the first connecting part 1211 of the second busbar component 122 is connected to the first wall 2101 of the first battery cell 201, and the second connecting part 1212 of the second busbar component 122 is connected to the first wall 2101 of the second battery cell 202, so as to connect the first battery cell 201 and the second battery cell 202 in parallel.

[0169] In some embodiments, unlike the battery cell 20 shown in Figures 4 to 7, the battery cell 20 may also be provided with another electrode terminal with the opposite polarity to the electrode terminal 214 described above. In this embodiment, the first busbar 121 and the second busbar 122 are respectively connected to the two electrode terminals included in the battery cell 20. Furthermore, the other electrode terminal with the opposite polarity may be located on the first wall 2101 or other walls to enable electrical connection between the battery cell 20 and other battery cells 20.

[0170] In some embodiments, the battery device 10 further includes a fourth busbar 124, which connects the first battery cell 201 and the third battery cell 203 in series, wherein the third battery cell 203 and the first battery cell 201 belong to different battery cell assemblies 200. The fourth busbar 124 can be used to achieve a series connection between different battery cell assemblies 200. For example, the fourth busbar 124 can be used to connect the positive terminal of the first battery cell 201 and the negative terminal of the third battery cell 203, or it can be used to connect the negative terminal of the first battery cell 201 and the positive terminal of the third battery cell 203.

[0171] It should be understood that for any battery cell 20, taking the first battery cell 201 as an example, the first battery cell 201 can be connected to a first busbar 121 and a second busbar 122 to achieve a parallel connection with the second battery cell 202; the first battery cell 201 can also be connected to a fourth busbar 124 to achieve a series connection with the third battery cell 203. The first busbar 121 and the fourth busbar 124 can be separate structures or integrated structures, and the second busbar 122 and the fourth busbar 124 can be separate structures or integrated structures. The embodiments of this application are not limited to this.

[0172] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0173] The electrical equipment can be any of the aforementioned devices or systems that utilize the battery device 10.

[0174] According to some embodiments of this application, referring to Figures 2 to 15, this application provides a battery device 10 including: a plurality of battery cell assemblies 200 connected in series, wherein a first battery cell assembly 210 of the plurality of battery cell assemblies 200 includes a plurality of battery cells 20 connected in parallel, wherein the plurality of battery cells 20 includes a first battery cell 201 and a second battery cell 202; and a current limiting element 12133 located on the circuit formed by the first battery cell 201 and the second battery cell 202.

[0175] The sum of the resistance values ​​of all current-limiting elements 12133 installed in the circuit formed by the first battery cell 201 and the second battery cell 202 ranges from [0.15Ω, 75Ω]. The first battery cell 201 and the second battery cell 202 satisfy at least one of the following conditions: the capacity of the first battery cell 201 ranges from [20Ah, 88Ah]; the capacity of the second battery cell 202 ranges from [20Ah, 88Ah]; the mass of the first battery cell 201 ranges from [0.37kg, 1.6kg]; and the mass of the second battery cell 202 ranges from [0.37kg, 1.6kg].

[0176] The battery device 10 further includes: a first busbar 121 for connecting the positive terminal of the first battery cell 201 and the positive terminal of the second battery cell 202; and a second busbar 122 for connecting the negative terminal of the first battery cell 201 and the negative terminal of the second battery cell 202; wherein at least one of the first busbar 121 and the second busbar 122 includes a current limiting element 12133. Each of the at least one busbar includes a first connection portion 1211, a second connection portion 1212, and a safety portion 1213. The first connection portion 1211 is used to connect to the first battery cell 201, the second connection portion 1212 is used to connect to the second battery cell 202, and the safety portion 1213 is located between the first connection portion 1211 and the second connection portion 1212, and the safety portion 1213 includes the current limiting element 12133. Each busbar component also includes a protective component 1214, which is used to protect the connection between the first connecting part 1211 and the safety part 1213, and / or protect the connection between the second connecting part 1212 and the safety part 1213.

[0177] The first battery cell 201 includes: a housing 21, the housing 21 including a first wall 2101; an electrode terminal 214 disposed on the first wall 2101; and an insulating structure 24 disposed between the electrode terminal 214 and the first wall 2101 for isolating the electrode terminal 214 from the first wall 2101 in the event of thermal runaway of the first battery cell 201. The first battery cell 201 also includes: an electrode assembly 22 housed within the housing 21; a connecting member 23 for electrically connecting the electrode terminal 214 and a first tab 2221 of the electrode assembly 22; and the insulating structure 24 is also located between the connecting member 23 and the first wall 2101 for isolating the connecting member 23 from the first wall 2101 in the event of thermal runaway of the first battery cell 201. The battery device 10 also includes: a third busbar 123 for electrical connection with the electrode terminal 214; and an insulating structure 24 located between the first wall 2101 and the third busbar 123 for isolating the first wall 2101 and the third busbar 123 in the event of thermal runaway of the first battery cell 201.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A series of battery cell assemblies (200), wherein a first battery cell assembly (210) of the series of battery cell assemblies (200) includes a series of battery cells (20) connected in parallel, wherein the series of battery cells (20) includes a first battery cell (201) and a second battery cell (202); A current limiting element (12133) is located on the circuit formed by the first battery cell (201) and the second battery cell (202).

2. The battery device according to claim 1, characterized in that, The sum of the resistance values ​​of all the current limiting elements (12133) provided on the circuit formed by the first battery cell (201) and the second battery cell (202) ranges from [0.15Ω, 75Ω].

3. The battery device according to claim 2, characterized in that, The first battery cell (201) and the second battery cell (202) satisfy at least one of the following conditions: The capacity of the first battery cell (201) ranges from [20Ah, 88Ah]; The capacity of the second battery cell (202) ranges from [20Ah, 88Ah]; The mass of the first battery cell (201) ranges from [0.37 kg to 1.6 kg]. The mass of the second battery cell (202) ranges from 0.37 kg to 1.6 kg.

4. The battery device according to any one of claims 1 to 3, characterized in that, The capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [35Ah, 50Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.25kg, 0.75kg]; and the sum of the resistance values ​​of all the current limiting elements (12133) set on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.28Ω, 30Ω].

5. The battery device according to any one of claims 1 to 3, characterized in that, The capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [15Ah, 30Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.27kg, 0.78kg]; and the sum of the resistance values ​​of all the current limiting elements (12133) set on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.25Ω, 60Ω].

6. The battery device according to any one of claims 1 to 3, characterized in that, The capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [9Ah, 23Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.13kg, 0.6kg]; and the sum of the resistance values ​​of all the current limiting elements (12133) set on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.3Ω, 75Ω].

7. The battery device according to any one of claims 1 to 3, characterized in that, The capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [12Ah, 30Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.28kg, 0.52kg]; and the sum of the resistance values ​​of all the current limiting elements (12133) set on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.28Ω, 60Ω].

8. The battery device according to any one of claims 1 to 3, characterized in that, The capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [73Ah, 102Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [1.1kg, 2.1kg]; and the sum of the resistance values ​​of all the current limiting elements (12133) set on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.15Ω, 15Ω].

9. The battery device according to any one of claims 1 to 8, characterized in that, The battery device also includes: The first busbar component (121) is used to connect the positive electrode of the first battery cell (201) and the positive electrode of the second battery cell (202); The second busbar component (122) is used to connect the negative terminal of the first battery cell (201) and the negative terminal of the second battery cell (202); Wherein, at least one of the first busbar component (121) and the second busbar component (122) includes the current limiting element (12133).

10. The battery device according to claim 9, characterized in that, Each of the at least one busbar component includes a first connecting part (1211), a second connecting part (1212), and a safety part (1213). The first connecting part (1211) is used to connect to the first battery cell (201), the second connecting part (1212) is used to connect to the second battery cell (202), and the safety part (1213) is located between the first connecting part (1211) and the second connecting part (1212). The safety part (1213) includes the current limiting element (12133).

11. The battery device according to claim 10, characterized in that, Each of the bus components also includes: A protective component (1214) is provided to protect the connection between the first connecting part (1211) and the safety part (1213), and / or to protect the connection between the second connecting part (1212) and the safety part (1213).

12. The battery device according to claim 10 or 11, characterized in that, The safety part (1213) is fixed to the first connecting part (1211) by welding; and / or, The safety part (1213) and the second connecting part (1212) are fixed together by welding.

13. The battery device according to any one of claims 1 to 12, characterized in that, The current limiting element (12133) includes at least one of the following: a capacitor, a bonding resistor, a resistance wire, and a diaphragm resistor.

14. The battery device according to any one of claims 1 to 13, characterized in that, The first battery cell (201) includes: The outer casing (21) includes a first wall (2101); Electrode terminals (214) are disposed on the first wall (2101); An insulating structure (24) is disposed between the electrode terminal (214) and the first wall (2101) to isolate the electrode terminal (214) from the first wall in the event of thermal runaway of the first battery cell (201). (2101)。 15. The battery device according to claim 14, characterized in that, The first battery cell (201) further includes: Electrode assembly (22) is housed within the housing (21); A connecting member (23) is used to electrically connect the electrode terminal (214) and the first tab (2221) of the electrode assembly (22); The insulating structure (24) is also located between the connecting member (23) and the first wall (2101) for isolating the connecting member (23) from the first wall (2101) in the event of thermal runaway of the first battery cell (201).

16. The battery device according to claim 15, characterized in that, The second tab (2222) of the electrode assembly (22) is electrically connected to the first wall (2101), and the second tab (2222) has the opposite polarity to the first tab (2221).

17. The battery device according to any one of claims 14 to 16, characterized in that, The battery device also includes: A third busbar (123) is used for electrical connection with the electrode terminal (214); The insulating structure (24) is also located between the first wall (2101) and the third busbar (123) for isolating the first wall (2101) and the third busbar (123) in the event of thermal runaway of the first battery cell (201).

18. The battery device according to any one of claims 14 to 17, characterized in that, The outer casing (21) includes: The shell (211) has a hollow structure with an opening (2111); A cover plate (212) for covering the opening (2111), the cover plate (212) including the first wall (2101).

19. The battery device according to any one of claims 14 to 18, characterized in that, The melting point of the insulating structure (24) is greater than or equal to 400°C.

20. The battery device according to any one of claims 14 to 19, characterized in that, The insulating structure (24) is made of at least one of the following materials: ceramic, glass fiber and polytetrafluoroethylene.

21. An electrical appliance, characterized in that, include: A battery device, comprising the battery device as claimed in any one of claims 1 to 20, the battery device being used to provide electrical energy to the electrical device.

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