Battery apparatus and electrical device

Abstract

A battery apparatus and an electrical device. The battery apparatus comprises: a plurality of battery cell assemblies connected in series, wherein a first battery cell assembly among the plurality of battery cell assemblies comprises the first to the N-th battery cells connected in parallel sequentially, N≥2 and N being an integer; current limiting elements, which are each provided in a loop formed by every two parallel-connected battery cells among the first to N-th battery cells; and an equalization module, two ends of the equalization module being respectively connected to the loop at the side of a first electrode and the loop at the side of a second electrode of the first battery cell assembly, and a current limiting element being present in an equalization circuit formed by the first battery cell and / or a current limiting element being present in an equalization circuit formed by the N-th battery cell. Thus, the performance and service life of the battery apparatus can be improved.

Description

Battery devices and electrical equipment Cross-references to related applications

[0001] This application claims priority to PCT international application PCT / CN2024 / 129116 entitled "Battery Device and Electrical Equipment" filed on October 31, 2024, and Chinese patent application 202510457295.3 entitled "Battery Device and Electrical Equipment" filed on April 11, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical appliance. Background Technology

[0003] 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.

[0004] During battery use, due to inherent differences in the batteries themselves and / or variations in external usage conditions, parameters such as capacity, state of charge (SOC), and voltage of individual battery cells can vary. Significant inconsistencies can lead to reduced overall capacity, lower charge / discharge power, and consequently, decreased battery performance and lifespan. Summary of the Invention

[0005] This application provides a battery device and an electrical appliance that can improve the performance and lifespan 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 first to an Nth battery cell connected in parallel in sequence, wherein N ≥ 2 and N is an integer; a current limiting element disposed in a circuit formed by two parallel battery cells among the first to Nth battery cells; and an balancing module, one end of which is connected to a circuit on the first electrode side of the first battery cell assembly, and the other end of which is connected to a circuit on the second electrode side of the first battery cell assembly, wherein at least one current limiting element exists in the balancing circuit formed by the balancing module and the first battery cell, and / or, at least one current limiting element exists in the balancing circuit formed by the balancing module and the Nth battery cell.

[0007] In the embodiments of this application, when the first battery cell assembly is balanced to make the multiple battery cell assemblies in the battery device more balanced, the difference in the charge of the battery cells in the first battery cell assembly can be reduced, the capacity and charge / discharge power of the first battery cell assembly can be improved, and the risk of the first battery cell assembly being overcharged or over-discharged for a long time can be reduced, thereby improving the performance and service life of the first battery cell assembly, and thus improving the performance and service life of the battery device.

[0008] In one possible implementation, a current-limiting element is provided on the circuit between the first poles of all parallel battery cells from the 1st to the Nth battery cells, where N≥3.

[0009] In the embodiments of this application, when a current-limiting element is provided between the first poles of each pair of parallel battery cells in the first battery cell assembly to the Nth battery cell assembly, the equalization circuit formed by the first battery cell assembly has at least one current-limiting element and / or the equalization circuit formed by the Nth battery cell assembly has at least one current-limiting element point. This can reduce the difference in charge of the battery cells in the first battery cell assembly when equalization processing is performed to make the multiple battery cell assemblies in the battery device more balanced, thereby improving the capacity and charge / discharge power of the first battery cell assembly. At the same time, it can also reduce the risk of the first battery cell assembly being overcharged or over-discharged for a long time, thereby improving the performance and service life of the first battery cell assembly, and thus improving the performance and service life of the battery device.

[0010] In one possible implementation, one end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current-limiting element connected to the first electrode of the first battery cell, and the other end of the equalization module is connected to the circuit between the second electrode of the second battery cell and the battery cell connected to the second electrode of the second battery cell. The first battery cell includes one of the second to the (N-1)th battery cells, and the second battery cell includes one of the first to the Nth battery cells.

[0011] In this embodiment, when the current-limiting element is disposed between the first poles of two parallel battery cells in the first battery cell assembly, by connecting one end of the balancing module to the circuit between the first pole of one of the battery cells from the 1st to the (N-1th)th battery cells and the current-limiting element connected to the first pole of that battery cell, and connecting the other end of the balancing module between the second pole of one of the battery cells from the 1st to the Nth battery cells and the second pole of another battery cell connected in parallel with that battery cell, the difference in charge of the battery cells in the first battery cell assembly can be reduced when the first battery cell assembly is balanced in order to make the multiple battery cell assemblies in the battery device more balanced. This improves the capacity and charge / discharge power of the first battery cell assembly, and also reduces the risk of the first battery cell assembly being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly, thereby improving the performance and service life of the battery device.

[0012] In one possible implementation, the first battery cell includes the (N+1) / 2th battery cell, where N is an odd number.

[0013] In this embodiment, when the current limiting element is disposed between the first poles of the battery cells connected in parallel in the first battery cell assembly and N is an odd number, one end of the balancing module is connected between the first pole of the (N+1) / 2th battery cell and the current limiting element connected to the first pole of the (N+1) / 2th battery cell, and the other end of the balancing module is connected to the loop between the second pole of one of the battery cells from the 1st to the Nth battery cells and the second pole of another battery cell connected in parallel with that battery cell. This can reduce the difference in charge of the battery cells in the first battery cell assembly when balancing the first battery cell assembly to make the multiple battery cell assemblies in the battery device more balanced, improve the capacity and charge / discharge power of the first battery cell assembly, and at the same time reduce the risk of the first battery cell assembly being overcharged or over-discharged for a long time, thereby improving the performance and service life of the first battery cell assembly, and thus improving the performance and service life of the battery device.

[0014] In one possible implementation, the first battery cell includes the N / 2th battery cell or the N / 2+1th battery cell, where N is an even number.

[0015] In this embodiment, when the current limiting element is disposed between the first poles of the battery cells connected in parallel in the first battery cell assembly and N is an even number, one end of the balancing module is connected to the circuit on one side of the first pole of the N / 2th battery cell or the N / 2+1th battery cell, and the other end of the balancing module is connected to the circuit on one side of the second pole of any battery cell from the 1st to the Nth battery cell. This can reduce the difference in charge of the battery cells in the first battery cell assembly when balancing the first battery cell assembly to make the multiple battery cell assemblies in the battery device more balanced, thereby improving the capacity and charge / discharge power of the first battery cell assembly. At the same time, it can also reduce the risk of the first battery cell assembly being overcharged or over-discharged for a long time, thereby improving the performance and service life of the first battery cell assembly, and thus improving the performance and service life of the battery device.

[0016] In one possible implementation, the current limiting element is disposed in the circuit between the first poles of the battery cells connected in parallel in pairs from the first battery cell to the Nth battery cell and the circuit between the second poles of the battery cells connected in parallel in pairs from the first battery cell to the Nth battery cell.

[0017] In the embodiments of this application, when current-limiting elements are respectively provided between the first poles of the parallel-connected battery cells in the first battery cell to the Nth battery cell of the first battery cell assembly, and respectively between the second poles of the parallel-connected battery cells, by having at least one current-limiting element in the balancing circuit formed by the first battery cell and / or having at least one current-limiting element in the balancing circuit formed by the Nth battery cell, the difference in charge of the battery cells in the first battery cell assembly can be reduced when the first battery cell assembly is balanced to make the multiple battery cell assemblies in the battery device more balanced. This improves the capacity and charge / discharge power of the first battery cell assembly, and also reduces the risk of the first battery cell assembly being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly, thereby improving the performance and service life of the battery device.

[0018] In one possible implementation, one end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the other end of the equalization module is connected to the circuit between the second battery cell and the current limiting element connected to the second battery cell. The first battery cell includes a first battery cell, and the second battery cell includes one of the second to Nth battery cells.

[0019] In this embodiment of the application, when current-limiting elements are respectively set between the first poles of the parallel-connected battery cells in the first battery cell assembly to the Nth battery cell assembly, and current-limiting elements are respectively set between the second poles of the parallel-connected battery cells, by connecting one end of the equalization module to the circuit on the first pole side of the first battery cell and the other end of the equalization module to the circuit on the second pole side of any one of the second battery cells to the Nth battery cell assembly, the difference in charge of the battery cells in the first battery cell assembly can be reduced when equalization processing is performed on the first battery cell assembly to make the multiple battery cell assemblies in the battery device more balanced, thereby improving the capacity and charge / discharge power of the first battery cell assembly, and at the same time reducing the risk of the first battery cell assembly being overcharged or over-discharged for a long time, the performance and service life of the first battery cell assembly can be improved, thereby improving the performance and service life of the battery device.

[0020] In one possible implementation, the second battery cell includes the Nth battery cell.

[0021] In this embodiment of the application, when current-limiting elements are respectively installed between the first poles of the first battery cells in the first battery cell assembly to the Nth battery cell assembly, and current-limiting elements are respectively installed between the second poles of the two parallel battery cells, one end of the balancing module is connected to the circuit on the first pole side of the first battery cell, and the other end of the balancing module is connected to the circuit on the second pole side of the Nth battery cell. In order to make the multiple battery cell assemblies in the battery device more balanced, the difference in charge of the battery cells in the first battery cell assembly can be reduced, and the capacity and charge / discharge power of the first battery cell assembly can be improved. At the same time, the risk of the first battery cell assembly being overcharged or over-discharged for a long time can be reduced, thereby improving the performance and service life of the first battery cell assembly, and thus improving the performance and service life of the battery device.

[0022] In one possible implementation, one end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the other end of the equalization module is connected to the circuit between the second electrode of the second battery cell and the current limiting element connected to the second electrode of the second battery cell. The first battery cell includes the Nth battery cell, and the second battery cell includes the second electrode of one of the battery cells from the 1st battery cell to the (N-1)th battery cell.

[0023] In this embodiment of the application, when current-limiting elements are respectively set between the first poles of the parallel-connected battery cells in the first battery cell assembly to the Nth battery cell assembly, and current-limiting elements are respectively set between the second poles of the parallel-connected battery cells, by connecting one end of the balancing module to the circuit on the first pole side of the Nth battery cell and the other end of the balancing module to the circuit on the second pole side of one of the battery cells in the first to N-1th battery cells, the difference in charge of the battery cells in the first battery cell assembly can be reduced when the first battery cell assembly is balanced in order to make the multiple battery cell assemblies in the battery device more balanced. This improves the capacity and charge / discharge power of the first battery cell assembly, and also reduces the risk of the first battery cell assembly being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly, thereby improving the performance and service life of the battery device.

[0024] In one possible implementation, the second battery cell includes the first battery cell.

[0025] In this embodiment of the application, when current-limiting elements are respectively installed between the first poles of the parallel-connected battery cells in the first battery cell assembly to the Nth battery cell assembly, and current-limiting elements are respectively installed between the second poles of the parallel-connected battery cells, one end of the balancing module can be connected to the circuit on the first pole side of the Nth battery cell, and the other end of the balancing module can be connected to the circuit on the second pole side of the first battery cell assembly. In order to make the multiple battery cell assemblies in the battery device more balanced, the difference in charge of the battery cells in the first battery cell assembly can be reduced, and the capacity and charge / discharge power of the first battery cell assembly can be improved. At the same time, the risk of the first battery cell assembly being overcharged or over-discharged for a long time can be reduced, thereby improving the performance and service life of the first battery cell assembly, and thus improving the performance and service life of the battery device.

[0026] In one possible implementation, one end of the equalization module is connected to the loop between the first electrode of the first battery cell and the current-limiting element connected to the first electrode of the first battery cell, and the second end of the equalization module is connected to the loop between the second electrode of the second battery cell and the current-limiting element connected to the second electrode of the second battery cell. The first battery cell includes one of the second to the (N-1)th battery cells, and the second battery cell includes one of the first to the Nth battery cells, where N≥3.

[0027] In this embodiment of the application, when current-limiting elements are respectively set between the first poles of the parallel-connected battery cells in the first battery cell to the Nth battery cell assembly, and current-limiting elements are respectively set between the second poles of the parallel-connected battery cells, by connecting one end of the balancing module to the circuit on the side of the first pole of one of the battery cells in the first to N-1th battery cells, and the other end of the balancing module to the circuit on the side of the second pole of one of the battery cells in the first to Nth battery cells, the difference in charge of the battery cells in the first battery cell assembly can be reduced when the first battery cell assembly is balanced in order to make the multiple battery cell assemblies in the battery device more balanced. This improves the capacity and charge / discharge power of the first battery cell assembly, and also reduces the risk of the first battery cell assembly being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly, thereby improving the performance and service life of the battery device.

[0028] In a second aspect, an electrical device is provided, which includes a battery device as described in the first aspect or any possible implementation thereof, the battery device being used to provide electrical energy to the electrical device. Attached Figure Description

[0029] Figure 1 is a structural schematic diagram of the vehicle provided in an embodiment of this application.

[0030] Figure 2 is a schematic diagram of the structure of the battery device provided in the embodiment of this application.

[0031] Figure 3 is a schematic diagram of the connection relationship of the battery device provided in the embodiment of this application.

[0032] Figure 4 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in the embodiment of this application.

[0033] Figure 5 is the equivalent circuit diagram of Figure 4.

[0034] Figure 6 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in the embodiment of this application.

[0035] Figure 7 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in an embodiment of this application.

[0036] Figure 8 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in the embodiment of this application.

[0037] Figure 9 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in an embodiment of this application.

[0038] Figure 10 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in an embodiment of this application.

[0039] Figure 11 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in an embodiment of this application.

[0040] Figure 12 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in an embodiment of this application.

[0041] Figure 13 is a schematic diagram of the connection between the first battery cell assembly and the equalization module provided in the embodiment of this application.

[0042] Figure label:

[0043] Vehicle: 1. Battery unit: 10. Controller: 30. Motor: 40. Housing: 11. First housing section: 111. Second housing section: 112. Battery cell: 20. First battery cell: 21. Second battery cell: 22. Third battery cell: 23. Fourth battery cell: 24. Fifth battery cell: 25. Sixth battery cell: 26. Multiple battery cell assembly: 200. First battery cell assembly: 210. Balancing module: 310. First busbar component: 121. Second busbar component: 122. Third busbar component: 1 23. Current limiting components: 124, 1# current limiting component: 1241, 2# current limiting component: 1242, 3# current limiting component: 1243, 4# current limiting component: 1244, 5# current limiting component: 1245, 1#-1 current limiting component: 12411, 2#-1 current limiting component: 12421, 3#-1 current limiting component: 12431, 4#-1 current limiting component: 12441, 1#-2 current limiting component: 12412, 2#-2 current limiting component: 12422, 3#-2 current limiting component: 12432, 4#-2 current limiting component: 12442. Detailed Implementation

[0044] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0046] 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 alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In this application, the terms "upper," "lower," "left," "right," "inner," and "outer," indicating orientation or positional relationships, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0049] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] During battery use, due to inherent differences in the batteries themselves and / or variations in external usage conditions, parameters such as capacity, state of charge (SOC), and voltage of individual battery cells can vary. Significant inconsistencies can lead to reduced overall capacity, lower charge / discharge power, and consequently, decreased battery performance and lifespan.

[0069] To address the aforementioned problems, this application provides a battery device and an electrical appliance. The battery device includes: a plurality of battery cell assemblies connected in series, wherein the first battery cell assembly includes a first to an Nth battery cell connected in parallel, wherein N ≥ 2 and N is an integer; a current limiting element disposed in a circuit formed by two parallel battery cells from the first to the Nth battery cells; and an balancing module, one end of which is connected to a circuit on the first electrode side of the first battery cell assembly, and the other end of which is connected to a circuit on the second electrode side of the first battery cell assembly. The balancing circuit formed by the balancing module and the first battery cell contains at least one current limiting element, and / or the balancing circuit formed by the balancing module and the Nth battery cell contains at least one current limiting element.

[0070] The battery device and electrical equipment provided in this application embodiment can reduce the difference in charge of individual cells in the first battery cell assembly when equalizing the first battery cell assembly to make the multiple battery cell assemblies in the battery device more balanced, thereby improving the capacity and charging / discharging power of the first battery cell assembly and reducing the risk of the first battery cell assembly being overcharged or over-discharged for a long time. This can improve the performance and lifespan of the first battery cell assembly, thereby improving the performance and lifespan of the battery device.

[0071] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0072] 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.

[0073] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] As shown in Figures 2 and 3 (only the connection relationship between the equalization module 310 and a first battery cell assembly is shown), the battery device 10 of this application embodiment includes: a plurality of battery cell assemblies 200 connected in series, a current limiting element 124, and an equalization module 310.

[0080] The first battery cell assembly 210 in the plurality of battery cell assemblies 200 includes the first battery cell 21 to the Nth battery cell connected in parallel in sequence, wherein N≥2 and N is an integer.

[0081] The current limiting element 124 is disposed in the circuit formed by the parallel connection of the battery cells from the first battery cell 21 to the Nth battery cell.

[0082] The equalization module 310 has one end connected to the circuit on the first pole side of the first battery cell assembly 210, and the other end connected to the circuit on the second pole side of the first battery cell assembly 210. The equalization circuit formed by the equalization module 310 and the first battery cell 21 contains at least one current limiting element 124, and / or the equalization circuit formed by the equalization module 310 and the Nth battery cell contains at least one current limiting element 124.

[0083] The battery device 10 may include multiple battery cell assemblies connected in series. As an example, the battery device 10 also includes a first busbar 121. The first busbar 121 can contain battery cells from different battery cell assemblies connected in series. For example, each row in FIG3 can represent a single battery cell assembly. Each battery cell assembly may include one or more battery cells, and the number of battery cells in different battery cell assemblies may be the same or different. This embodiment does not limit the number of battery cells in different battery cell assemblies. For example, as shown in FIG3, the battery device 10 of this embodiment includes multiple battery cell assemblies 200 with the same number of battery cells.

[0084] The number of battery cells connected in parallel within each battery cell assembly can be set according to the actual application. For example, the number of battery cells connected in parallel within each battery cell assembly can be less than or equal to 10. Setting each battery cell assembly to include two or more battery cells 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, so the number of battery cells connected in parallel within each battery cell assembly should not be too large.

[0085] In this embodiment of the application, the first battery cell assembly 210 can be any one of the multiple battery cell assemblies 200.

[0086] In the first battery cell assembly 210, any two battery cells from the first battery cell 21 to the Nth battery cell can be connected in parallel through a conductive element. For example, as shown in Figure 3, the first battery cell 21 is connected in parallel with the second battery cell 22 through a conductive element, the second battery cell 22 is connected in parallel with the third battery cell 23 through a conductive element, the third battery cell 23 is connected in parallel with the fourth battery cell 24 through a conductive element, and the fourth battery cell 24 is connected in parallel with the fifth battery cell 25 through a conductive element. Therefore, the first battery cell 21 and the second battery cell 22, the second battery cell 22 and the third battery cell 23, the third battery cell 23 and the fourth battery cell 24, and the fourth battery cell 24 and the fifth battery cell 25 are the battery cells connected in parallel through pairs in the first battery cell assembly 210.

[0087] As an example, the first battery cell 21, the second battery cell 22, the third battery cell 23, the fourth battery cell 24, and the fifth battery cell 25 can be five battery cells arranged sequentially in the first battery cell assembly 210 shown in Figure 2. Alternatively, the first battery cell 21, the second battery cell 22, the third battery cell 23, the fourth battery cell 24, and the fifth battery cell 25 can be battery cells on one side edge, the middle battery cell, the battery cell between the battery cells on one side edge and the middle battery cell, the battery cell between the battery cells on the other side edge and the middle battery cell, and the battery cell on the other side edge, respectively, in the first battery cell assembly 210 shown in Figure 2. That is to say, in the first battery cell assembly 210 shown in Figure 2, the positions of battery cells connected in parallel in pairs can be adjacent or not adjacent.

[0088] In this embodiment, the current-limiting element 124 is disposed on a circuit formed between two parallel battery cells. That is, the current-limiting element 124 can be located at any position in the circuit, and one or more current-limiting elements 124 can be disposed on the circuit. The resistance value of each current-limiting element 124 can be the same or different. As an example, the circuit formed between two parallel battery cells may include a busbar for connecting the positive or negative terminals of the two battery cells, and the current-limiting element 124 can be located on the busbar. For another example, the circuit formed between two parallel battery cells may include the two battery cells themselves, in which case the current-limiting element 124 can also be located on one battery cell and / or the other battery cell. This embodiment is not limited to these embodiments.

[0089] As an example, the conductive elements may include a second busbar 122 and / or a third busbar 123. The second busbar 122 may be used to connect the positive terminals of two battery cells connected in parallel. The third busbar 123 may be used to connect the negative terminals of two battery cells connected in parallel. For example, at least one of the second busbar 122 and the third busbar 123 includes a current-limiting element 124.

[0090] In the embodiments of this application, when one of the battery cells in a series of parallel battery cells experiences thermal runaway, for example, taking the battery cell in the first battery cell assembly 210 in Figure 3, such as the middle battery cell, as an example, even if the thermally runaway battery cell is close to a short circuit, making it equivalent to a resistor with a very small resistance, the current limiting element 124 is provided between the battery cell and its adjacent battery cells. The current limiting element 124 can limit the current in the circuit between the battery cell and its adjacent (parallel) battery cells to 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 10.

[0091] As an example, the current limiting element 124 includes at least one of the following: a capacitor, a bonded resistor, a resistance wire, and a diaphragm resistor, for ease of fabrication. For example, the current limiting element 124 may be a bonded resistor.

[0092] The circuit on the first electrode side of the first battery cell assembly 210 can be understood as the circuit between the first electrodes of all pairs of parallel battery cells from the first battery cell 21 to the Nth battery cell in the first battery cell assembly 210. The circuit on the second electrode side of the first battery cell assembly 210 can be understood as the circuit between the second electrodes of all pairs of parallel battery cells from the first battery cell 21 to the Nth battery cell in the first battery cell assembly 210.

[0093] One end of the balancing module 310 can be connected to the circuit on the first pole side of the first battery cell assembly 210, that is, one end of the balancing module 310 can be connected to the circuit on the first pole side of one of the battery cells from the first battery cell 21 to the Nth battery cell. For example, if no current limiting element 124 is provided between the first poles of the battery cells connected in parallel in the first battery cell assembly 210, one end of the balancing module 310 is connected to the circuit between the first pole of one battery cell and the first pole of another battery cell connected in parallel in the same way; as another example, if a current limiting element 124 is provided between the first poles of the battery cells connected in parallel in the first battery cell assembly 210, one end of the balancing module 310 is connected to the circuit between the first pole of one battery cell and the current limiting element connected to the first pole of that battery cell.

[0094] Similarly, the other end of the balancing module 310 can be connected to the circuit on one side of the second pole of the first battery cell assembly 210. That is, the other end of the balancing module 310 can be connected to the circuit on one side of the second pole of one of the battery cells from the first battery cell 21 to the Nth battery cell. For example, if no current limiting element 124 is provided between the second poles of the battery cells connected in parallel in the first battery cell assembly 210, the other end of the balancing module 310 is connected to the circuit between the second pole of one battery cell and the second pole of another battery cell connected in parallel in the same battery cell. As another example, if a current limiting element 124 is provided between the second poles of the battery cells connected in parallel in the first battery cell assembly 210, one end of the balancing module 310 is connected to the circuit between the second pole of one battery cell and the current limiting element connected to the second pole of that battery cell.

[0095] As an example, when the voltage difference between multiple battery cell assemblies 200 connected in series reaches a preset value, some of the battery cell assemblies 200 can be balanced. For instance, when the voltage difference between two adjacent battery cell assemblies shown in Figure 3 reaches a preset value, one of the battery cell assemblies, such as the first battery cell assembly 210, can be balanced. The first to Nth battery cells in the first battery cell assembly 210 that need to be balanced form N balancing circuits, used to charge or discharge the first to Nth battery cells.

[0096] When balancing the first battery cell assembly 210, each of the first battery cells 21 to Nth battery cells in the first battery cell assembly 210 can be charged or discharged through its respective balancing circuit. For example, when the battery device 10 has a high charge level, it can discharge and balance the first battery cells 21 to Nth battery cells, or when the battery device 10 has a low charge level, it can charge and balance the first battery cells 21 to Nth battery cells. The balancing circuit can be understood as either the circuit where the balancing module 310 discharges to the first battery cells 21 to Nth battery cells when it is connected to the first battery cell assembly 210, or the circuit where the first battery cells 21 to Nth battery cells discharge to the balancing module 310. The balancing circuits corresponding to the first battery cells 21 to Nth battery cells will differ depending on the connection position of the balancing module 310 in the first battery cell assembly 210.

[0097] As an example, the balancing module 310 may include a power source and / or a balancing load such as a resistor. During charging balancing of the first battery cell assembly 210, the power source may supply electrical energy to the first battery cell assembly 210; during discharging balancing of the first battery cell assembly 210, the first battery cell assembly 210 may supply electrical energy to the balancing load.

[0098] Due to the presence of the current limiting element 124, if the balancing module 310 is not positioned properly within the first battery assembly 210, it will increase the difference in charge levels, such as state of charge (SOC), between the individual cells in the first battery cell assembly 210, thereby reducing the overall capacity and charging / discharging power of the first battery cell assembly 210. As an example, assuming N=5, the bottommost first battery cell assembly 210 shown in Figure 3 includes, from left to right, the first battery cell 21 to the fifth battery cell 25. Current limiting elements 1#1241 to 4#1244 can be respectively positioned between the first poles, such as the positive poles, of the two parallel battery cells.

[0099] Typically, the two ends of the balancing module 310 are connected to the circuits on the first electrode side and the second electrode side of the first battery cell 21 of the first battery cell assembly 210, respectively, or to the circuits on the first electrode side and the second electrode side of the Nth battery cell. For example, for the bottommost first battery cell assembly 210 shown in FIG3, the two ends of the balancing module 310 are connected to the circuit between the positive electrode of the first battery cell 21 and the current limiting element 124142 connected to the positive electrode of the first battery cell 21, and the circuit between the negative electrode of the fifth battery cell 25 and the negative electrode of the fourth battery cell 24, respectively. As another example, for the middle first battery cell assembly 210 shown in FIG3, the two ends of the balancing module 310 are connected to the circuit between the positive electrode of the first battery cell 21 and the current limiting element 124 connected to the positive electrode of the first battery cell 21, and the circuit between the negative electrode of the first battery cell 21 and the current limiting element 124 connected to the negative electrode of the first battery cell 21, respectively.

[0100] For the first battery cell assembly 210 at the bottom shown in Figure 3, when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21 of the first battery cell assembly 210, the equalization circuit corresponding to the first battery cell 21 includes the first battery cell 21, the equalization circuit corresponding to the second battery cell 22 includes the 1# current limiting element 1241 and the second battery cell 22, the equalization circuit corresponding to the third battery cell 23 includes the 1# current limiting element 1241, the 2# current limiting element 1242 and the third battery cell 23, the equalization circuit corresponding to the fourth battery cell 24 includes the 1# current limiting element 1241, the 2# current limiting element 1242, the 3# current limiting element 1243 and the fourth battery cell 24, and the equalization circuit corresponding to the fifth battery cell 25 includes the 1# current limiting element 1241, the 2# current limiting element 1242, the 3# current limiting element 1243, the 4# current limiting element 1244 and the fifth battery cell 25.

[0101] Therefore, when the resistance values ​​of the current-limiting elements 124 between any two parallel battery cells are equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / r, U / (R+r), U / (2R+r), U / (3R+r), and U / (4R+r), respectively. Here, U can be the provided equalization voltage value, R is the resistance value of current-limiting elements 1# to 4#, and r is the internal resistance value of the first battery cell 21 to the fifth battery cell 25. Here, the difference in internal resistance between the first battery cell 21 and the fifth battery cell 25 is small; for ease of calculation and understanding, they can be considered approximately equal.

[0102] Alternatively, when the resistance values ​​of the current-limiting elements 124 between two parallel battery cells are not equal, the equalizing currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / r, U / (R1+r), U / (R1+R2+r), ​​U / (R1+R2+R3+r), and U / (R1+R2+R3+R4+r), respectively. Here, U can be the provided equalizing voltage value, R1, R2, R3, and R4 are the resistance values ​​of current-limiting elements 1#1241, 1242, 1243, and 1244, respectively, and r is the internal resistance value of the first battery cell 21 to the fifth battery cell 25.

[0103] The connection method of this equalization module 310 in the first battery assembly 210 causes the differences in the charge and other properties among the multiple battery cells in the first battery cell assembly 210 to gradually increase during the equalization process.

[0104] Therefore, in this embodiment, one end of the equalization module 310 can be connected to the circuit on the first electrode side of the first battery cell assembly 210, and the other end of the equalization module 310 can be connected to the circuit on the second electrode side of the first battery cell assembly 210. Furthermore, the equalization circuit formed by the equalization module 310 and the first battery cell 21 contains at least one current-limiting element 124, and / or, the equalization circuit formed by the equalization module 310 and the Nth battery cell contains at least one current-limiting element 124.

[0105] That is, regardless of the position of the equalization module 310 in the first battery cell assembly 210, there is at least one current limiting element 124 in the equalization circuit formed by the equalization module 310 and the first battery cell 21, and / or there is at least one current limiting element 124 in the equalization circuit formed by the equalization module 310 and the Nth battery cell.

[0106] As an example, in the first battery cell assembly 210 at the bottom shown in Figure 3, one end of the balancing module 310 can be connected to the circuit between the positive terminal of the second battery cell 22 in the first battery cell assembly 210 and the current limiting element 1241 or the current limiting element 1242, and the other end of the balancing module 310 is connected to the circuit between the negative terminal of the third battery cell 23 in the first battery cell assembly 210 and the negative terminal of the second battery cell 22 or the third battery cell 23.

[0107] Thus, the equalization circuit corresponding to the first battery cell 21 includes current limiting element 1241 and the first battery cell 21; the equalization circuit corresponding to the second battery cell 22 includes the second battery cell 22; the equalization circuit corresponding to the third battery cell 23 includes current limiting element 1242 and the third battery cell 23; the equalization circuit corresponding to the fourth battery cell 24 includes current limiting element 1242, current limiting element 1243 and the fourth battery cell 24; and the equalization circuit corresponding to the fifth battery cell 25 includes current limiting element 1242, current limiting element 1243, current limiting element 1244 and the fifth battery cell 25.

[0108] Therefore, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are equal, the equalization currents corresponding to battery cells 1 to 5 are U / (R+r), U / r, U / (R+r), U / (2R+r), and U / (3R+r), respectively, where the maximum equalization current difference is U / rU / (3R+r). Compared to the maximum equalization current difference U / rU / (4R+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side of the first battery cell 21 (the circuit between the first pole of the first battery cell 21 and the current-limiting element 124 connected to the first pole of the first battery cell 21) and the circuit on the second pole side of the first battery cell 21 (the circuit between the negative pole of the first battery cell 21 and the negative pole of the second battery cell 22), the battery device provided in this application can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0109] Alternatively, when the resistance values ​​of the current limiting elements 124 between the two parallel battery cells are not equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / (R1+r), U / r, U / (R2+r), ​​U / (R2+R3+r), and I = U / (R2+R3+R4+r), respectively, where the maximum equalization current difference is U / rU / (R2+R3+R4+r) or U / rU / (R1+r). Compared to the above-mentioned circuit where the two ends of the equalization module 310 are respectively connected to the first pole side of the first battery cell 21 (the circuit between the first pole of the first battery cell 21 and the current limiting element 124 connected to the first pole of the first battery cell 21) and the circuit between the second pole side of the first battery cell 21 (the circuit between the negative pole of the first battery cell 21 and the negative pole of the second battery cell 22), the battery device 10 provided in this application can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0110] Similarly, the maximum equalization current difference when the two ends of the equalization module 310 are respectively connected to the circuit on the first electrode side and the circuit on the second electrode side of the Nth battery cell in the bottommost first battery cell assembly 210 shown in Figure 3 is also less than the maximum equalization current difference when the two ends of the equalization module 310 are respectively connected to the circuit on the first electrode side and the circuit on the second electrode side of the first battery cell 21. For simplicity, this application will not elaborate on the equalization current of each battery cell when the two ends of the equalization module 310 are respectively connected to the circuit on the first electrode side and the circuit on the second electrode side of the Nth battery cell.

[0111] Similarly, when the first battery cell assembly 210 is undergoing discharge equalization, the battery device 10 provided in this application embodiment can still reduce the difference in equalization current between the battery cells in the first battery cell assembly 210. For ease of description and understanding, the following description will use the first battery cell assembly 210 undergoing charge equalization as an example.

[0112] In this embodiment, the two ends of the equalization module 310 can be connected to the circuit on the first pole side and the circuit on the second pole side of the same battery cell in the first battery cell assembly 210, or they can be connected to the circuit on the first pole side and the circuit on the second pole side of different battery cells, as long as the following conditions are met: there is at least one current limiting element 124 in the equalization circuit formed by the equalization module 310 and the first battery cell 21, and / or there is at least one current limiting element 124 in the equalization circuit formed by the equalization module 310 and the Nth battery cell.

[0113] In this embodiment, the balancing module 310 can be configured independently or integrated with other modules. For example, the balancing module 310 can be configured in the battery management system (BMS).

[0114] Multiple first battery cell modules 210 can share a single equalization module 310, or one first battery cell module 210 can correspond to one equalization module 310.

[0115] It should be understood that in the embodiments of this application, the first electrode can be the positive electrode of the battery cell, and the second electrode can be the negative electrode of the battery cell. Alternatively, the first electrode can be the positive electrode of the battery cell, and the second electrode can be the negative electrode of the battery cell.

[0116] In this embodiment, when balancing the first battery cell assembly 210 to make the multiple battery cell assemblies 200 in the battery device 10 more even, the difference in charge of the individual cells in the first battery cell assembly 210 can be reduced, thereby improving the capacity and charging / discharging power of the first battery cell assembly 210. At the same time, the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time can be reduced, thereby improving the performance and service life of the first battery cell assembly 210, and thus improving the performance and service life of the battery device 10.

[0117] In some embodiments, a current limiting element 124 is provided on the circuit between the first poles of the battery cells connected in parallel in pairs from the first battery cell 21 to the Nth battery cell, wherein N≥3.

[0118] In other words, if current limiting elements 124 are provided only on the circuit between the first poles of the battery cells connected in parallel in pairs from the first battery cell 21 to the Nth battery cell, the number of battery cells in the first battery cell assembly 210 must be ≥3.

[0119] As an example, for the topmost battery cell assembly of the first group of battery cells connected to the positive output terminal of the battery device 10, as shown in FIG3, the current limiting element 124 is usually not provided between the positive terminals of the multiple parallel battery cells included in the first group of battery cells assembly. A current limiting element 124 is provided between the negative terminals of each pair of parallel battery cells in the first group of battery cells assembly. The first battery cell assembly 210 may include this first group of battery cells assembly, and the first terminal may be the negative terminal.

[0120] As another example, for the last group of battery cells connected to the negative output terminal of the battery device 10, as shown in the bottom electrode assembly of FIG3, the current limiting element 124 is typically not provided between the negative terminals of the multiple parallel battery cells included in the last group of battery cells. Instead, a current limiting element 124 is provided between the positive terminals of each pair of parallel battery cells in the last group of battery cells. The first battery cell assembly 210 may include the last group of battery cells, and the first terminal may be the positive terminal.

[0121] In this embodiment of the application, when a current-limiting element 124 is provided between the first poles of the first battery cells 21 to the Nth battery cells in the first battery cell assembly 210 connected in parallel, the presence of at least one current-limiting element 124 in the balancing circuit formed by the first battery cell 21 and / or the presence of at least one current-limiting element 124 in the balancing circuit formed by the Nth battery cell can reduce the difference in charge of the battery cells in the first battery cell assembly 210, improve the capacity and charging / discharging power of the first battery cell assembly 210, and reduce the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This can improve the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0122] For ease of description and understanding, the following will take the first battery cell assembly 210 as an example and, in conjunction with Figures 4 to 7, further explain the connection position of the equalization module 310 when the current limiting element 124 is set between the first poles of the two parallel battery cells in the first battery cell assembly 210.

[0123] In some embodiments, as shown in FIG4, one end of the equalization module 310 is connected to the circuit between the first electrode of the first battery cell and the current limiting element 124 connected to the first electrode of the first battery cell, and the other end of the equalization module 310 is connected to the circuit between the second electrode of the second battery cell and the battery cell connected to the second electrode of the second battery cell. The first battery cell includes one of the second battery cell 22 to the (N-1)th battery cell, and the second battery cell includes one of the first battery cell 21 to the Nth battery cell.

[0124] That is, one end of the equalization module 310 is connected to the circuit between the first terminal of any one of the second battery cells 22 to the (N-1)th battery cells and the current limiting element 124 connected to the first terminal of that battery cell, and the other end of the equalization module 310 is connected to the circuit between the negative terminal of any one of the first battery cells 21 to the Nth battery cells and the negative terminal of another battery cell that is connected in parallel with that battery cell.

[0125] As an example, as shown in Figures 4 and 5, the current limiting element 124 is disposed between the first poles of the two parallel battery cells in the first battery cell assembly 210. Assuming N=5, one end of the equalization module 310 can be connected to the loop between the first pole (e.g., the positive pole) of the second battery cell 22 and the first current limiting element 1241 or the second current limiting element 1242. The other end of the equalization module 310 can be connected to the loop between the second pole (e.g., the negative pole) of the first battery cell 21 and the second pole of the second battery cell 22.

[0126] Thus, as shown in Figures 4 and 5, the equalization circuit corresponding to the first battery cell 21 includes current limiting element 1241 and the first battery cell 21; the equalization circuit corresponding to the second battery cell 22 includes the second battery cell 22; the equalization circuit corresponding to the third battery cell 23 includes current limiting element 1242 and the third battery cell 23; the equalization circuit corresponding to the fourth battery cell 24 includes current limiting element 1242, current limiting element 1243 and the fourth battery cell 24; and the equalization circuit corresponding to the fifth battery cell 25 includes current limiting element 1242, current limiting element 1243, current limiting element 1244 and the fifth battery cell 25.

[0127] Therefore, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / (R+r), U / r, U / (R+r), U / (2R+r), and U / (3R+r), respectively, where the maximum equalization current difference is U / rU / (3R+r). Compared to the maximum equalization current difference U / rU / (4R+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between the battery cells in the first battery cell assembly 210.

[0128] Alternatively, when the resistance values ​​of the current-limiting elements 124 between two parallel battery cells are not equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / (R1+r), U / r, U / (R2+r), ​​U / (R2+R3+r), and U / (R2+R3+R4+r), respectively, where the maximum equalization current difference is U / rU / (R1+r) or U / rU / (R2+R3+R4+r). Compared to the maximum equalization current difference U / rU / (R1+R2+R3+R4+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0129] In this embodiment, when the current limiting element 124 is disposed between the first poles of the battery cells connected in parallel in the first battery cell assembly 210, by connecting one end of the balancing module 310 to the circuit between the first pole of one of the battery cells from the second battery cell 22 to the (N-1)th battery and the current limiting element 124 connected to the first pole of that battery cell, and connecting the other end of the balancing module 310 to the second pole of one of the battery cells from the first battery cell 21 to the Nth battery cell and the second pole of another battery cell connected in parallel with that battery cell, the difference in charge of the battery cells in the first battery cell assembly 210 can be reduced when the first battery cell assembly 210 is balanced in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced. This improves the capacity and charging / discharging power of the first battery cell assembly 210, and also reduces the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0130] In some embodiments, the first battery cell includes the first electrode of the (N+1) / 2th battery cell, where N is an odd number.

[0131] That is, one end of the equalization module 310 is connected to the circuit between the first pole of the (N+1) / 2th battery cell and the current limiting element 124 connected to the first pole of the (N+1) / 2th battery cell, and the other end of the equalization module 310 is connected to the circuit between the second pole of any one of the first battery cells 21 to the Nth battery cells and the second pole of another battery cell whose poles are connected in parallel.

[0132] As an example, as shown in Figure 6, the current limiting element 124 is disposed between the first poles of the two parallel battery cells in the first battery cell assembly 210. Assuming N=5, one end of the equalization module 310 can be connected to the loop between the first pole (e.g., positive pole) of the third battery cell 23 in the first battery cell assembly 210 and the current limiting element 1242 or the current limiting element 1243. The other end of the equalization module 310 can be connected to the loop between the second pole (e.g., negative pole) of the third battery cell 23 and the second pole of the second battery cell 22 or the fourth battery cell 24.

[0133] Thus, the equalization circuit corresponding to the first battery cell 21 includes current limiting element 1241, current limiting element 1242, and the first battery cell 21; the equalization circuit corresponding to the second battery cell 22 includes current limiting element 1242, and the second battery cell 22; the equalization circuit corresponding to the third battery cell 23 includes the third battery cell 23; the equalization circuit corresponding to the fourth battery cell 24 includes current limiting element 1243, and the fourth battery cell 24; and the equalization circuit corresponding to the fifth battery cell 25 includes current limiting element 1243, current limiting element 1244, and the fifth battery cell 25.

[0134] Therefore, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / (2R+r), U / (R+r), U / r, U / (R+r), and I = U / (2R+r), respectively, where the maximum equalization current difference is U / rU / (2R+r). Compared to the maximum equalization current difference U / rU / (4R+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between the battery cells in the first battery cell assembly 210.

[0135] Alternatively, when the resistance values ​​of the current-limiting elements 124 between two parallel battery cells are not equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / (R1+R2+r), ​​U / (R2+r), ​​U / r, U / (R3+r), and I = U / (R3+R4+r), respectively, where the maximum equalization current difference is U / rU / (R1+R2+r) or U / rU / (R3+R4+r). Compared to the maximum equalization current difference U / rU / (R1+R2+R3+R4+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0136] In this embodiment, when the current limiting element 124 is disposed between the first poles of the battery cells connected in parallel in the first battery cell assembly 210 and N is an odd number, one end of the balancing module 310 is connected between the first pole of the (N+1) / 2th battery cell and the current limiting element 124 connected to the first pole of the (N+1) / 2th battery cell, and the other end of the balancing module 310 is connected to the loop between the second pole of one of the battery cells from the first battery cell 21 to the Nth battery cell and the second pole of another battery cell connected in parallel with that battery cell. This can reduce the difference in charge of the battery cells in the first battery cell assembly 210 when balancing the first battery cell assembly 210 to make the multiple battery cell assemblies 200 in the battery device 10 more balanced, improve the capacity and charging / discharging power of the first battery cell assembly 210, and at the same time reduce the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This can improve the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0137] In some embodiments, as shown in FIG7, the first battery cell includes the N / 2th battery cell, where N is an even number.

[0138] That is, one end of the equalization module 310 is connected to the circuit between the first pole of the N / 2th battery cell and the current limiting element 124 connected to the first pole of the N / 2th battery cell, and the other end of the equalization module 310 is connected to the circuit between the second pole of any one of the battery cells from the 1st battery cell 21 to the Nth battery cell and the second pole of another battery cell that is connected in parallel with each other.

[0139] As an example, assuming N=6, as shown in Figure 7, one end of the equalization module 310 is connected to the loop between the first pole (positive pole) of the third battery cell 23 and the current limiting element 1242 or the current limiting element 1243, and the other end of the equalization module 310 is connected to the loop between the second pole (negative pole) of the third battery cell 23 and the second pole of the second battery cell 22 or the fourth battery cell 24.

[0140] Thus, the equalization circuit corresponding to the first battery cell 21 includes current limiting element 1241, current limiting element 1242, and the first battery cell 21; the equalization circuit corresponding to the second battery cell 22 includes current limiting element 1242, and the second battery cell 22; the equalization circuit corresponding to the third battery cell 23 includes the third battery cell 23; the equalization circuit corresponding to the fourth battery cell 24 includes current limiting element 1243, and the fourth battery cell 24; the equalization circuit corresponding to the fifth battery cell 25 includes current limiting element 1243, current limiting element 1244, and the fifth battery cell 25; and the equalization circuit corresponding to the sixth battery cell 26 includes current limiting element 1243, current limiting element 1244, current limiting element 1245, and the sixth battery cell 26.

[0141] Therefore, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are equal, the equalization currents corresponding to the first battery cell 21 to the sixth battery cell 26 are U / (2R+r), U / (R+r), U / r, U / (R+r), U / (2R+r), and U / (3R+r), respectively, where the maximum equalization current difference is U / rU / (3R+r). Compared to the maximum equalization current difference U / rU / (6R+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between the battery cells in the first battery cell assembly 210.

[0142] Alternatively, when the resistance values ​​of the current-limiting elements 124 between two parallel battery cells are not equal, the equalization currents corresponding to battery cells 1 through 6 are U / (R1+R2+r), ​​U / (R2+r), ​​U / r, U / (R3+r), U / (R3+R4+r), and U / (R3+R4+R5+r), respectively, where the maximum equalization current difference is U / rU / (R1+R2+r) or U / rU / (R3+R4+R5+r). Compared to the maximum equalization current difference U / rU / (R1+R2+R3+R4+R5+R6+r when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0143] Optionally, as shown in Figure 8, the first battery cell includes the N / 2+1th battery cell, where N is an even number.

[0144] That is, the other end of the equalization module 310 is connected to the loop between the first electrode of the N / 2+1th battery cell and the current-limiting element block connected to the first electrode of the N / 2+1th battery cell. The other end of the equalization module 310 is connected to the loop between the second electrode of any one of the battery cells from the 1st battery cell 21 to the Nth battery cell and the second electrode of another battery cell connected in parallel with each of those batteries.

[0145] As an example, as shown in Figure 8, one end of the equalization module 310 is connected to the circuit between the first electrode (positive electrode) of the fourth battery cell 24 and the current limiting element 1243 or the current limiting element 1244, and the other end of the equalization module 310 is connected to the circuit between the second electrode (negative electrode) of the fourth battery cell 24 and the second electrode of the third battery cell 23 or the fifth battery cell 25.

[0146] When the first battery cell includes the N / 2+1th battery cell, the maximum equalization current difference between the individual battery cells in the first battery cell assembly 210 is less than the maximum equalization current difference when the two ends of the equalization module 310 are respectively connected to the circuit on the first electrode side and the circuit on the second electrode side of the first battery cell 21. For the sake of brevity, this application will not elaborate further.

[0147] In this embodiment, when the current limiting element 124 is disposed between the first poles of the battery cells connected in parallel in the first battery cell assembly 210 and N is an even number, one end of the balancing module 310 is connected to the circuit on one side of the first pole of the N / 2th battery cell or the N / 2+1th battery cell, and the other end of the balancing module 310 is connected to the circuit on one side of the second pole of any of the battery cells from the 1st battery cell 21 to the Nth battery cell. This can reduce the difference in charge of the battery cells in the first battery cell assembly 210 when balancing the first battery cell assembly 210 in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced, thereby improving the capacity and charging / discharging power of the first battery cell assembly 210. At the same time, it can also reduce the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time, thereby improving the performance and service life of the first battery cell assembly 210, and thus improving the performance and service life of the battery device 10.

[0148] In some embodiments, as shown in Figures 9 to 13, current limiting elements 124 are provided between the first and second poles of the battery cells connected in parallel in pairs from the first battery cell 21 to the Nth battery cell.

[0149] As an example, a current-limiting element 124 is provided between the first poles of each pair of parallel-connected battery cells from the first battery cell 21 to the Nth battery cell, and a current-limiting element 124 is provided between the second poles of each pair of parallel-connected battery cells from the first battery cell 21 to the Nth battery cell. That is, a current-limiting element 124 is provided between the positive and negative poles of the first battery cell 21 and the second battery cell 22, between the positive and negative poles of the second battery cell 22 and the third battery cell 23, ..., between the positive and negative poles of the (N-1)th battery cell and the Nth battery cell.

[0150] For example, assuming N=5, as shown in Figures 9 to 13, current limiting elements 1#-1 12411 and 1#-2 12412 are respectively installed between the positive and negative electrodes of the first battery cell 21 and the second battery cell 22; current limiting elements 2#-1 12421 and 2#-2 12422 are respectively installed between the positive and negative electrodes of the second battery cell 22 and the third battery cell 23; current limiting elements 3#-1 12431 and 3#-2 12432 are respectively installed between the positive and negative electrodes of the third battery cell 23 and the fourth battery cell 24; and current limiting elements 4#-1 12441 and 4#-2 12442 are respectively installed between the positive and negative electrodes of the fourth battery cell 24 and the fifth battery cell 25.

[0151] As an example, the first battery cell assembly 210 can be any one of the other battery cell assemblies in the battery device 10 shown in FIG3, except for the battery cell assembly connected to the positive output stage and the negative output stage. In the other battery cell assemblies, a current limiting element 124 is provided between the positive and negative terminals of each battery cell connected in parallel.

[0152] As another example, the first battery cell assembly 210 can be any one of the battery cell assemblies 200 in the battery device 10. For example, unlike the first group of battery cell assemblies connected to the positive output terminal of the battery device 10 in FIG3, a current limiting element 124 can be provided between the positive terminals of the two parallel battery cells in the first group of battery cell assemblies connected to the positive output terminal of the battery device 10; similarly, unlike the last group of battery cell assemblies connected to the negative output terminal of the battery device 10 in FIG3, a current limiting element 124 can be provided between the negative terminals of the two parallel battery cells in the last group of battery cell assemblies connected to the negative output terminal of the battery device 10.

[0153] In this embodiment of the application, when a current-limiting element 124 is respectively provided between the first poles of the first battery cell 21 to the Nth battery cell in the first battery cell assembly 210, and a current-limiting element 124 is respectively provided between the second poles of the two parallel battery cells, by having at least one current-limiting element 124 in the balancing circuit formed by the first battery cell 21 and / or at least one current-limiting element 124 in the balancing circuit formed by the Nth battery cell, the difference in charge of the battery cells in the first battery cell assembly 210 can be reduced when the first battery cell assembly 210 is balanced in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced. This improves the capacity and charging / discharging power of the first battery cell assembly 210, and also reduces the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0154] In some embodiments, as shown in FIG9, one end of the equalization module 310 is connected to the circuit between the first electrode of the first battery cell and the current limiting element 124 connected to the first electrode of the first battery cell, and the other end of the equalization module 310 is connected to the circuit between the second battery cell and the current limiting element 124 connected to the second battery cell. The first battery cell includes a first battery cell 21, and the second battery cell includes one of the second battery cell 22 to the Nth battery cell.

[0155] That is, one end of the equalization module 310 is connected to the circuit between the first electrode (positive electrode) of the first battery cell 21 and the current limiting element 124 connected to the first electrode of the first battery cell 21, and the other end of the equalization module 310 is connected to the circuit between the second electrode (negative electrode) of any one of the battery cells from the second battery cell 22 to the Nth battery cell and the current limiting element 124 connected to the second electrode of that battery cell.

[0156] As an example, as shown in Figure 9, assuming N=5, one end of the equalization module 310 is connected to the loop between the positive terminal of the first battery cell 21 and the 1#-1 current limiting element 12411, and the other end of the equalization module 310 is connected to the loop between the negative terminal of the third battery cell 23 and the 2#-2 current limiting element 12422 or the 3#-2 current limiting element 12432.

[0157] Thus, the equalization circuit corresponding to the first battery cell 21 includes the first battery cell 21, current limiting element 12412 (1#-2), and current limiting element 12422 (2#-2); the equalization circuit corresponding to the second battery cell 22 includes current limiting element 12411 (1#-1), the second battery cell 22, and current limiting element 12422 (2#-2); the equalization circuit corresponding to the third battery cell 23 includes current limiting element 12411 (1#-1), current limiting element 12421 (2#-1), and the third battery cell 23; the equalization circuit corresponding to the fourth battery cell 24... The equalization circuit includes current limiting element 12411 (1#-1), current limiting element 12421 (2#-1), current limiting element 12431 (3#-1), the fourth battery cell 24, and current limiting element 12432 (3#-2). The equalization circuit corresponding to the fifth battery cell 25 includes current limiting element 12411 (1#-1), current limiting element 12421 (2#-1), current limiting element 12431 (3#-1), current limiting element 12441 (4#-1), the fifth battery cell 25, current limiting element 12442 (4#-2), and current limiting element 12432 (3#-2).

[0158] When the resistance of the current limiting element 124 between the two parallel battery cells is equal, the equalization currents corresponding to the first battery cell 21 to the fifth battery cell 25 are U / (2R+r), U / (2R+r), U / (2R+r), U / (4R+r), and U / (6R+r), respectively, where the maximum equalization current difference is U / (2R+r)-U / (6R+r). Compared to the circuit where the two ends of the equalization module 310 are respectively connected to the first pole side of the first battery cell 21 (the circuit between the first pole of the first battery cell 21 and the current limiting element 124 connected to the first pole of the first battery cell 21, such as the current limiting element 12411 connected to the first pole of the first battery cell 21, such as the current limiting element 12412 connected to the first pole of the first battery cell 21), the maximum equalization current difference U / rU / (8R+r) can be reduced.

[0159] Alternatively, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are not equal, the equalization currents corresponding to battery cells 1 through 5 are U / (R12+R22+r), ​​U / (R11+R22+r), ​​U / (R11+R21+r), U / (R11+R21+R31+R32+r), ​​and U / (R11+R21+R31+R41+R32+R42+r), ​​respectively. In this connection method of the equalization module 310 in the first battery cell assembly 210, its maximum equalization current is less than that of the circuit that connects the two ends of the equalization module 310 to the first pole side of the first battery cell 21 (the first battery cell). The maximum equalization current U / r when the first pole of the first battery cell 21 is connected to the current limiting element 124 (such as the loop between current limiting element 12411, 1#-1) and the loop on the second pole side (such as the loop between current limiting element 12412, 1#-2) is greater than the minimum equalization current U / (R11+R21+R31+R41+R12+R22+R32+R42+r) when the two ends of the equalization module 310 are respectively connected to the loop on the first pole side and the loop on the second pole side of the first battery cell 21. Therefore, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0160] In this embodiment of the application, when current-limiting elements 124 are respectively provided between the first poles of the first battery cells 21 to the Nth battery cells in the first battery cell assembly 210, and between the second poles of the two parallel battery cells, by connecting one end of the equalization module 310 to the circuit on the first pole side of the first battery cell 21 and the other end of the equalization module 310 to the circuit on the second pole side of any one of the second battery cells 22 to the Nth battery cells, the difference in charge of the battery cells in the first battery cell assembly 210 can be reduced when the first battery cell assembly 210 is balanced in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced. This improves the capacity and charging / discharging power of the first battery cell assembly 210, and also reduces the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0161] As an example, as shown in Figure 10, the second battery cell may include the Nth battery cell.

[0162] That is, one end of the equalization module 310 is connected to the circuit between the first electrode (positive electrode) of the first battery cell 21 and the current limiting element 124 connected to the first electrode of the first battery cell 21, and the other end of the equalization module 310 is connected to the circuit between the second electrode (negative electrode) of the Nth battery cell and the current limiting element 124 connected to the second electrode of the Nth battery cell.

[0163] For example, as shown in Figure 10, assuming N=5, one end of the equalization module 310 is connected to the circuit between the first electrode (positive electrode) of the first battery cell 21 and the 1#-1 current limiting element 12411, and the other end of the equalization module 310 is connected to the circuit between the second electrode (negative electrode) of the fifth battery cell 25 and the 4#-2 current limiting element 12442.

[0164] Thus, the equalization circuit corresponding to the first battery cell 21 includes the first battery cell 21, current limiting element 12412 (1#-2), current limiting element 12422 (2#-2), current limiting element 12432 (3#-2), and current limiting element 12442 (4#-2). The equalization circuit corresponding to the second battery cell 22 includes current limiting element 12411 (1#-1), current limiting element 12422 (2#-2), current limiting element 12432 (3#-2), and current limiting element 12442 (4#-2). The equalization circuit corresponding to the third battery cell 23 includes current limiting element 12411 (1#-1), current limiting element 12442 (2#-1), and current limiting element 12442 (2#-1). The equalization circuit corresponding to the fourth battery cell 24 includes the following components: 12421, 23, 3#-2 current limiting element 12432, 4#-2 current limiting element 12442; 12421, 2#-1 current limiting element 12421, 3#-1 current limiting element 12431, 24, 4#-2 current limiting element 12442; 12421, 2#-1 current limiting element 12421, 3#-1 current limiting element 12431, 4#-1 current limiting element 12441, and 25.

[0165] Therefore, when the resistance values ​​of the current-limiting elements 124 between two parallel battery cells are equal, the equalization current corresponding to the first battery cell 21 to the fifth battery cell 25 is U / (4R+r), where the maximum equalization current difference is 0. Compared to the maximum equalization current difference U / rU / (8R+r) when the two ends of the equalization module 310 are respectively connected to the first pole side of the first battery cell 21 (the loop between the first pole of the first battery cell 21 and the current-limiting element 124 connected to the first pole of the first battery cell 21, such as the loop between the current-limiting element 12411 connected to the first pole of the first battery cell 21, such as the loop between the current-limiting element 12412 connected to the first pole of the first battery cell 21), the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0166] Alternatively, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are not equal, the equalization currents corresponding to battery cells 1 through 5 are U / (R12+R22+R32+R42+r), ​​U / (R11+R22+R32+R42+r), ​​U / (R11+R21+R32+R42+r), ​​U / (R11+R21+R31+R42+r), ​​and U / (R11+R21+R31+R41+r). In this connection method of the equalization module 310 in the first battery cell assembly 210, its maximum equalization current is less than that of the above-mentioned connection of the two ends of the equalization module 310 to the first pole side of the first battery cell 21. The maximum equalization current U / r when the circuit (the loop between the first pole of the first battery cell 21 and the current limiting element 124 connected to the first pole of the first battery cell 21, such as current limiting element 12411 connected to the first pole of the first battery cell 21, such as current limiting element 12412 connected to the first pole of the first battery cell 21) and the loop on the second pole side (the loop between the first pole of the first battery cell 21 and the current limiting element 12412 connected to the first pole of the first battery cell 21, such as current limiting element 12412 connected to the first pole of the first battery cell 21) is greater than the minimum equalization current U / (R11+R21+R31+R41+R12+R22+R32+R42+r) when the two ends of the equalization module 310 are respectively connected to the loop on the first pole side of the first battery cell 21 and the loop on the second pole side. Therefore, the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0167] In this embodiment of the application, when current-limiting elements 124 are respectively provided between the first poles of the first battery cells 21 to the Nth battery cells in the first battery cell assembly 210, and between the second poles of the two parallel battery cells, one end of the balancing module 310 is connected to the circuit on the first pole side of the first battery cell 21, and the other end of the balancing module 310 is connected to the circuit on the second pole side of the Nth battery cell. In this way, when the first battery cell assembly 210 is balanced in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced, the difference in charge of the battery cells in the first battery cell assembly 210 can be reduced, and the capacity and charge / discharge power of the first battery cell assembly 210 can be improved. At the same time, the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time can be reduced, thereby improving the performance and service life of the first battery cell assembly 210, and thus improving the performance and service life of the battery device 10.

[0168] In some embodiments, as shown in FIG11, one end of the equalization module 310 is connected to the circuit between the first electrode of the first battery cell and the current limiting element 124 connected to the first electrode of the first battery cell, and the other end of the equalization module 310 is connected to the circuit between the second electrode of the second battery cell and the current limiting element 124 connected to the second electrode of the second battery cell. The first battery cell includes the Nth battery cell, and the second battery cell includes one of the first battery cell 21 to the (N-1)th battery cell.

[0169] That is, one end of the equalization module 310 is connected to the circuit between the first electrode (positive electrode) of the Nth battery cell and the current limiting element 124 connected to the first electrode of the Nth battery cell, and the other end of the equalization module 310 is connected to the circuit between the second electrode (negative electrode) of any one of the battery cells from the 1st battery cell 21 to the (N-1)th battery cell and the current limiting element 124 connected to the second electrode of that battery cell.

[0170] As an example, as shown in Figure 11, assuming N=5, one end of the equalization module 310 can be connected to the loop between the positive terminal of the 5th battery cell 25 and the 4#-1 current limiting element 12441, and the other end of the equalization module 310 can be connected to the loop between the negative terminal of the 3rd battery cell 23 and the 2#-2 current limiting element 12422 or the 3#-2 current limiting element 12432.

[0171] Similarly, the connection method of this equalization module 310 in the first battery cell assembly 210 results in a maximum equalization current difference that is less than the maximum equalization current difference when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side of the first battery cell 21 (the circuit between the first pole of the first battery cell 21 and the current limiting element 124 connected to the first pole of the first battery cell 21, such as the circuit between ...), such as the circuit between the current limiting element 124 connected to the first pole of the first battery cell 21, such as the circuit between the current limiting element 124 connected to the first pole of the first battery cell 21), such as the circuit between the current limiting element 124 connected to the first pole of the first battery cell 21, such as the circuit between the current limiting element 124 connected to the first pole of the first battery cell 21), such as the circuit between the current limiting element 124 connected to the first pole of the first battery cell 21). For the sake of simplicity, the embodiments of this application will not be described in detail here.

[0172] In this embodiment of the application, when current-limiting elements 124 are respectively provided between the first poles of the first battery cells 21 to the Nth battery cells in the first battery cell assembly 210, and between the second poles of the two parallel battery cells, by connecting one end of the equalization module 310 to the circuit on the first pole side of the Nth battery cell and the other end of the equalization module 310 to the circuit on the second pole side of one of the battery cells 21 to the N-1th battery cells, the difference in charge of the battery cells in the first battery cell assembly 210 can be reduced when the first battery cell assembly 210 is balanced in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced. This improves the capacity and charge / discharge power of the first battery cell assembly 210, and also reduces the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0173] As an example, as shown in Figure 12, the second battery cell includes the first battery cell 21.

[0174] That is, one end of the equalization module 310 is connected to the circuit between the first electrode of the Nth battery cell and the current limiting element 124 connected to the first electrode of the Nth battery cell, and the other end of the equalization module 310 is connected to the circuit between the second electrode of the 1st battery cell 21 and the current limiting element 124 connected to the second electrode of the 1st battery cell 21.

[0175] As an example, assuming N=5, as shown in Figure 12, one end of the equalization module 310 is connected to the circuit between the positive terminal of the 5th battery cell 25 and the 4#-1 current limiting element 12441, and the other end of the equalization module 310 is connected to the circuit between the negative terminal of the 1st battery cell 21 and the 1#-2 current limiting element 12412.

[0176] When one end of the balancing module 310 is connected to the circuit on the first electrode side of the Nth battery cell and the other end of the balancing module 310 is connected to the circuit on the second electrode side of the 1st battery cell 21, its maximum balancing current difference is less than the maximum balancing current difference when both ends of the balancing module 310 are respectively connected to the circuit on the first electrode side of the 1st battery cell 21 (the circuit between the first electrode of the 1st battery cell 21 and the current limiting element 124 connected to the first electrode of the 1st battery cell 21, such as current limiting element 12411 connected to the first electrode of the 1st battery cell 21, such as current limiting element 12412 connected to the first electrode of the 1st battery cell 21, such as current limiting element 12412 connected to the first electrode of the 1st battery cell 21). For simplicity, the calculation method of the balancing current of each battery cell is not described in detail in this embodiment.

[0177] In this embodiment of the application, when current-limiting elements 124 are respectively provided between the first poles of the first battery cells 21 to the Nth battery cells in the first battery cell assembly 210, and between the second poles of the two parallel battery cells, one end of the balancing module 310 is connected to the circuit on the first pole side of the Nth battery cell, and the other end of the balancing module 310 is connected to the circuit on the second pole side of the first battery cell 21. In this way, when the first battery cell assembly 210 is balanced to make the multiple battery cell assemblies 200 in the battery device 10 more balanced, the difference in charge of the battery cells in the first battery cell assembly 210 is reduced, the capacity and charge / discharge power of the first battery cell assembly 210 are improved, and the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time is reduced. This improves the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0178] In some embodiments, as shown in FIG13, one end of the equalization module 310 is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the second end of the equalization module 310 is connected to the circuit between the second electrode of the second battery cell and the current limiting element 124 connected to the second electrode of the second battery cell. The first battery cell includes one of the second battery cell 22 to the (N-1)th battery cell, and the second battery cell includes one of the first battery cell 21 to the Nth battery cell, wherein N≥3.

[0179] That is, one end of the equalization module 310 is connected to the circuit between the first terminal of any one of the second battery cells 22 to the (N-1)th battery cells and the current limiting element 124 connected to the first terminal of that battery cell, and the other end of the equalization module 310 is connected to the circuit between the second terminal of any one of the first battery cells 21 to the Nth battery cells and the current limiting element 124 connected to the second terminal of that battery cell.

[0180] As an example, as shown in Figure 13, assuming N=5, one end of the equalization module 310 is connected to the loop between the first electrode (positive electrode) of the third battery cell 23 and the current limiting element 12421 (2#-1) or the current limiting element 12431 (3#-1), and the other end of the equalization module 310 is connected to the loop between the second electrode (negative electrode) of the third battery cell 23 and the current limiting element 12422 (2#-2) or the current limiting element 12422 (3#-2).

[0181] Thus, the equalization circuit corresponding to the first battery cell 21 includes current limiting element 12411 (1#-1), current limiting element 12421 (2#-1), the first battery cell 21, current limiting element 12412 (1#-2), and current limiting element 12422 (2#-2). The equalization circuit corresponding to the second battery cell 22 includes current limiting element 12421 (2#-1), the second battery cell 22, and current limiting element 12422 (2#-2). The equalization circuit corresponding to the third battery cell 23... The equalization circuit includes the third battery cell 23. The equalization circuit corresponding to the fourth battery cell 24 includes the 3#-1 current limiting element 12431, the fourth battery cell 24, and the 3#-2 current limiting element 12432. The equalization circuit corresponding to the fifth battery cell 25 includes the 3#-1 current limiting element 12431, the 4#-1 current limiting element 12441, the fifth battery cell 25, the 3#-2 current limiting element 12432, and the 4#-2 current limiting element 12442.

[0182] When the resistance of the current limiting element 124 between the two parallel battery cells is equal, the equalization currents corresponding to battery cells 1 to 5 are U / (4R+r), U / (2R+r), U / r, U / (2R+r), and U / (4R+r), respectively. Among them, the maximum equalization current difference is U / +rU / (2R+r). Compared to the maximum equalization current difference U / rU / (8R+r) when the two ends of the equalization module 310 are respectively connected to the circuit on the first pole side of the first battery cell 21 (the circuit between the first pole of the first battery cell 21 and the current limiting element 124 connected to the first pole of the first battery cell 21, such as the current limiting element 12411 connected to the first pole of the first battery cell 21, such as the current limiting element 12412 connected to the first pole of the first battery cell 21), the battery device 10 provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0183] Alternatively, when the resistance values ​​of the current-limiting elements 124 between the two parallel battery cells are not equal, the balancing currents corresponding to battery cells #1 to #5 are U / (R11+R21+R12+R22+r), ​​U / (R21+R22+r), ​​U / r, U / (R31+R32+r), ​​and U / (R31+R41+R32+R42+r), ​​respectively. In this connection method of the balancing module in the first battery cell assembly 210, the maximum balancing current U / r is equal to the maximum balancing current when the two ends of the balancing module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21, and its minimum balancing current is greater than the minimum balancing current U / (R11+R21+R31+R41+R12+R22+R32+R42+r) when the two ends of the balancing module 310 are respectively connected to the circuit on the first pole side and the circuit on the second pole side of the first battery cell 21. Therefore, the battery device provided in this application embodiment can reduce the difference in equalization current between battery cells in the first battery cell assembly 210.

[0184] In this embodiment of the application, when current-limiting elements 124 are respectively provided between the first poles of the first battery cells 21 to the Nth battery cells in the first battery cell assembly 210, and between the second poles of the two parallel battery cells, a current-limiting element 124 can be respectively provided between the first poles of the two parallel battery cells 21 to the Nth battery cells. By connecting one end of the equalization module 310 to the circuit on the side of the first pole of one of the battery cells 22 to the N-1th battery cells, and the other end of the equalization module 310 to the circuit on the side of the second pole of one of the battery cells 21 to the Nth battery cells, the difference in charge of the battery cells in the first battery cell assembly 210 can be reduced when the first battery cell assembly 210 is balanced in order to make the multiple battery cell assemblies 200 in the battery device 10 more balanced. This improves the capacity and charge / discharge power of the first battery cell assembly 210, and also reduces the risk of the first battery cell assembly 210 being overcharged or over-discharged for a long time. This improves the performance and service life of the first battery cell assembly 210, thereby improving the performance and service life of the battery device 10.

[0185] In some embodiments, multiple battery cell modules 200 can be mutually balanced, such as one battery cell module charging another battery cell module, that is, one battery cell module discharging while another battery cell module is charging.

[0186] The first battery cell assembly 210 may include the one battery cell assembly and the other battery cell assembly.

[0187] This application embodiment also provides an electrical device, which includes a battery device 10 provided in this application embodiment, and the battery device 10 is used to provide electrical energy to the electrical device.

[0188] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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, The battery device includes: A series of multiple battery cell assemblies, wherein the first battery cell assembly of the multiple battery cell assemblies includes the first to Nth battery cells connected in parallel in sequence, wherein N≥2 and N is an integer; A current limiting element is provided in the circuit formed by two parallel battery cells from the first battery cell to the Nth battery cell; The equalization module has one end connected to the circuit on the first electrode side of the first battery cell assembly, and the other end connected to the circuit on the second electrode side of the first battery cell assembly. The equalization circuit formed by the equalization module and the first battery cell contains at least one current-limiting element, and / or the equalization circuit formed by the equalization module and the Nth battery cell contains at least one current-limiting element.

2. The battery device according to claim 1, characterized in that, The current limiting element is provided on the circuit between the first poles of the battery cells connected in parallel in pairs from the first battery cell to the Nth battery cell, where N≥3.

3. The battery device according to claim 2, characterized in that, One end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the other end of the equalization module is connected to the circuit between the second electrode of the second battery cell and the battery cell connected to the second electrode of the second battery cell. The first battery cell includes one of the second to the (N-1)th battery cells, and the second battery cell includes one of the first to the Nth battery cells.

4. The battery device according to claim 3, characterized in that, The first battery cell includes the (N+1) / 2th battery cell, where N is an odd number.

5. The battery device according to claim 3, characterized in that, The first battery cell includes the first electrode of the N / 2th battery cell or the N / 2+1th battery cell, where N is an even number.

6. The battery device according to claim 1, characterized in that, The current limiting element is disposed in the circuit between the first poles of the battery cells connected in parallel in pairs from the first battery cell to the Nth battery cell, and in the circuit between the second poles of the battery cells connected in parallel in pairs from the first battery cell to the Nth battery cell.

7. The battery device according to claim 6, characterized in that, One end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the other end of the equalization module is connected to the circuit between the second battery cell and the current limiting element connected to the second battery cell. The first battery cell includes the first battery cell, and the second battery cell includes one of the second to the Nth battery cells.

8. The battery device according to claim 7, characterized in that, The second battery cell includes the Nth battery cell.

9. The battery device according to claim 6, characterized in that, One end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the other end of the equalization module is connected to the circuit between the second electrode of the second battery cell and the current limiting element connected to the second electrode of the second battery cell. The first battery cell includes the Nth battery cell, and the second battery cell includes the second electrode of one of the battery cells from the 1st battery cell to the (N-1)th battery cell.

10. The battery device according to claim 9, characterized in that, The second battery cell includes the first battery cell.

11. The battery device according to claim 6, characterized in that, One end of the equalization module is connected to the circuit between the first electrode of the first battery cell and the current limiting element connected to the first electrode of the first battery cell, and the second end of the equalization module is connected to the circuit between the second electrode of the second battery cell and the current limiting element connected to the second electrode of the second battery cell. The first battery cell includes one of the second to the (N-1)th battery cells, and the second battery cell includes one of the first to the Nth battery cells, where N≥3.

12. An electrical appliance, characterized in that, The electrical equipment includes a battery device as described in any one of claims 1 to 11, the battery device being used to provide electrical energy to the electrical equipment.

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