Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment, and the battery device comprises a plurality of battery modules which are connected in series, and each battery module comprises a plurality of battery cells which are connected in series; the plurality of sampling assemblies are in one-to-one correspondence with the plurality of battery modules, and each sampling assembly is arranged on the corresponding battery module and is used for collecting and processing state information of each battery cell in the corresponding battery module; the plurality of first wireless communication assemblies are connected with the plurality of sampling assemblies in a one-to-one correspondence manner, and the sampling assemblies arranged on the adjacent battery modules are in isolated communication through the first wireless communication assemblies in a coil coupling manner; each first wireless communication assembly comprises a first wireless receiving coil used for receiving data and a first wireless transmitting coil used for transmitting data. Therefore, the overall size of the battery device can be reduced, the battery energy density can be improved, the structure of the battery device can be simplified, and assembly and maintenance are facilitated.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery devices and electrical equipment. Background Technology

[0002] This section is intended to provide background or context for embodiments of this application. The description herein is not intended to imply that it is prior art simply because it is included in this section.

[0003] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0004] To ensure the safe operation of a battery system, it is typically necessary to sample and transmit the status information of each cell in real time to support the control decisions of the Battery Management System (BMS). In related technologies, transformer isolation is usually used between the sampling components corresponding to different battery modules to achieve isolated signal communication. The transformer physically isolates high and low voltage electrical signals to ensure electrical safety, while wiring harnesses and connectors transmit the sampled information of the battery module to other battery modules or the main control unit. However, traditional transformers, formed by magnetic core windings, are large and costly, which limits their application, especially when meeting high safety level requirements such as Automotive Safety Integrity Level (ASIL) C / D. Furthermore, this approach relies on numerous wiring harness connections, increasing the structural complexity of the battery device and leading to difficulties in assembly and maintenance. Utility Model Content

[0005] In view of this, the present application aims to provide a battery device and electrical equipment that can reduce the overall size of the battery device, increase the battery energy density, and simplify the structure of the battery device, making it easier to assemble and maintain.

[0006] The technical solution of this application embodiment is implemented as follows:

[0007] This application provides a battery device, including:

[0008] Multiple battery modules are connected in series, and each battery module includes multiple battery cells connected in series.

[0009] Multiple sampling components are associated with multiple battery modules. Each sampling component is set on the corresponding battery module and is used to collect and process the status information of each cell in the corresponding battery module.

[0010] Multiple first wireless communication components are connected one-to-one with multiple sampling components. The sampling components on adjacent battery modules are isolated from each other by coil coupling through the first wireless communication components. Each first wireless communication component includes a first wireless receiving coil for receiving data and a first wireless transmitting coil for transmitting data.

[0011] Based on the aforementioned technical means, multiple sampling components are used to collect the status information of the cells in each battery module, and coil-coupled isolated communication is achieved through a first wireless communication component. This avoids the problems of large size, high cost, and difficult assembly and maintenance associated with traditional transformer isolation methods. Furthermore, using coil-coupled communication instead of wiring harnesses and connectors reduces space occupation and improves system integration, thereby increasing the energy density of the battery system and reducing manufacturing and maintenance costs.

[0012] In some embodiments, the plurality of battery modules include an adjacent first battery module and a second battery module, and the plurality of sampling components include a first sampling component disposed on the first battery module and a second sampling component disposed on the second battery module;

[0013] The first wireless transmitting coil connected to the first sampling component and the first wireless receiving coil connected to the second sampling component are positioned opposite each other.

[0014] According to the above technical means, setting up a first wireless transmitting coil and a first wireless receiving coil opposite each other between the sampling components of adjacent battery modules can ensure stable signal transmission, improve communication reliability, and simplify the layout design between battery modules.

[0015] In some embodiments, a plurality of battery modules are arranged along a target direction, and each battery module has a first end face and a second end face disposed opposite to each other along the target direction.

[0016] The first wireless receiving coil and the first wireless transmitting coil connected to each sampling component are respectively located on the first end face and the second end face of the battery module where the sampling component is located.

[0017] According to the above technical means, the first wireless receiving coil and the first wireless transmitting coil are respectively set on the two ends of the battery module, which facilitates the alignment between battery modules and the communication of corresponding sampling components, can further optimize space utilization, and support the modular installation of battery devices.

[0018] In some embodiments, the battery device further includes:

[0019] A first circuit board is provided on the first end face of the battery module where each sampling component is located, and the first wireless receiving coil connected to the sampling component is provided on the first circuit board.

[0020] A second circuit board is provided on the second end face of the battery module where each sampling component is located, and the first wireless transmitting coil connected to the sampling component is provided on the second circuit board.

[0021] By integrating the wireless communication coils onto the circuit boards attached to the two ends of the battery module, the structural stability can be improved and the electrical connection performance between the coils and the circuit can be enhanced.

[0022] In some embodiments, the first wireless receiving coil is printed on the first circuit board;

[0023] The first wireless transmitting coil is printed on the second circuit board.

[0024] According to the above-mentioned technical means, the first wireless receiving coil and the first wireless transmitting coil are integrated on the second circuit board by printing, which not only further reduces the size of the first wireless receiving coil and the first wireless transmitting coil, but also improves production efficiency, reduces manufacturing costs, and enhances the consistency and stability of the coil.

[0025] In some embodiments, each first wireless communication component further includes:

[0026] A modulation component is disposed between the first wireless transmitting coil and the sampling component, and is used to modulate the cell status information collected by the sampling component into a carrier signal, and transmit the modulated carrier signal through the first wireless transmitting coil;

[0027] A demodulation component is disposed between the first wireless receiving coil and the sampling component, and is used to demodulate the carrier signal received by the first wireless receiving coil and then transmit it to the sampling component.

[0028] Based on the above-mentioned technical means, the conversion between digital signals and analog carrier signals can be achieved through modulation and demodulation components, which can effectively improve communication quality and ensure the integrity and accuracy of signals during wireless transmission.

[0029] In some embodiments, the battery device further includes:

[0030] A control component, and a second wireless communication component connected to the control component;

[0031] The control component communicates with the first wireless communication component via a second wireless communication component, and is isolated from the sampling component by coil coupling.

[0032] Based on the above technical means, the control component communicates with the sampling component in isolation through the second wireless communication component, which makes the whole system have higher security and anti-interference capabilities, while also improving the overall communication architecture flexibility of the system and reducing the size of the communication component on the control component side.

[0033] In some embodiments, the plurality of sampling components include a third sampling component disposed on a third battery module and a fourth sampling component disposed on a fourth battery module, wherein the third battery module and the fourth battery module are respectively the first battery module and the last battery module in the plurality of battery modules connected in series.

[0034] The second wireless communication component includes a second wireless receiving coil for receiving data and a second wireless transmitting coil for transmitting data. The second wireless transmitting coil connected to the control component is disposed opposite to the first wireless receiving coil connected to the third sampling component, and the second wireless receiving coil connected to the control component is disposed opposite to the first wireless transmitting coil connected to the fourth sampling component.

[0035] Based on the above technical means, by setting up sampling components on the first and last battery modules and establishing a wireless communication link with the control components, the centralized control and distributed sampling of the entire battery system are organically combined, thereby improving the reliability and response speed of the system operation.

[0036] In some embodiments, each sampling component includes:

[0037] Multiple sampling chips, communication harness, and at least one isolation capacitor;

[0038] Each sampling chip is used to collect and process the status information of some cells in the corresponding battery module. Multiple sampling chips in the same sampling component are connected in sequence through a communication harness, and an isolation capacitor is set on the communication harness between two adjacent sampling chips.

[0039] Based on the above technical means, multiple sampling chips in the same sampling component are connected and work together through a communication harness. By adding an isolation capacitor to the communication harness, different potential regions can be effectively isolated while maintaining signal transmission efficiency and reliability, thereby improving system security and stability.

[0040] This application provides an electrical device including the battery device described in the above embodiments. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the hardware structure of a battery device provided in an embodiment of this application;

[0042] Figure 2 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 1 ;

[0043] Figure 3 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 2 ;

[0044] Figure 4 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 3 ;

[0045] Figure 5 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 4 ;

[0046] Figure 6 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 5 ;

[0047] Figure 7 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 6 ;

[0048] Figure 8 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 7 ;

[0049] Figure 9 A schematic diagram of the composition structure of a battery device provided in this application embodiment. Figure 8 ;

[0050] Figure 10 This application provides a schematic diagram illustrating the connection relationship between sampling chips in a sampling component.

[0051] Figure 11 This is a schematic diagram of the composition structure of an electrical device provided in an embodiment of this application.

[0052] Explanation of reference numerals in the attached figures:

[0053] 10: Battery device; 11: Battery module; 111: Battery cell; 12: Sampling component; 13: First wireless communication component; 131: First wireless receiving coil; 132: First wireless transmitting coil; 11a: First battery module; 11b: Second battery module; 11c: Third battery module; 11d: Fourth battery module; 12a: First sampling component; 12b: Second sampling component; 12c: Third sampling component; 12d: Fourth sampling component; X: Target direction; A1: First end face; A2: Second end face; 14: First circuit board; 15: Second circuit board; 133: Modulation component; 134: Demodulation component; 16: Control component; 17: Second wireless communication component; 171: Second wireless receiving coil; 172: Second wireless transmitting coil; 121: Sampling chip; 122: Communication harness; C: Isolation capacitor; 200: Electrical equipment. Detailed Implementation

[0054] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other. The detailed description in the specific implementation should be understood as an explanation of the technical concept of this application and should not be regarded as an improper limitation of this application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" 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, "multiple" means two or more, unless otherwise explicitly defined.

[0057] 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.

[0058] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0059] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0060] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0062] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store large amounts of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As the application areas of power batteries continue to expand, the market demand is also constantly increasing.

[0063] In this embodiment, the battery device can be manufactured from battery cells and / or battery modules. A battery cell refers to a single battery cell, which is the basic unit capable of converting chemical energy into electrical energy. It can be used to manufacture battery modules or battery devices to supply power to electrical devices. A single battery cell can be a primary battery or a secondary battery. A secondary battery is a battery cell that can be recharged after discharge to reactivate its active materials and continue to be used. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, or lead-acid batteries, etc., and this embodiment is not limited to these types. A single battery cell can be cylindrical, cuboid, or other shapes.

[0064] A battery cell includes an electrode assembly, which comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits while allowing active ions to pass through.

[0065] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0066] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0067] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0068] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0069] Liquid electrolytes include electrolyte salts and solvents.

[0070] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0071] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0072] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0073] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0074] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0075] In some implementations, the electrode assembly is a stacked structure.

[0076] In the following description, the technical terms and concepts involved will be explained as necessary to facilitate a better understanding of the core content and technical features of this application.

[0077] 1) Battery Module: Refers to a modular battery unit composed of multiple cells connected in series, which is the basic structural unit of the entire battery pack. Each battery module can independently complete functions such as voltage acquisition and status monitoring through corresponding sampling components, and can be connected to the corresponding sampling components or control components of other modules through communication.

[0078] 2) Sampling Component: A hardware device used to collect status information such as voltage and temperature of each cell in the battery module. For example, a sampling component may include one sampling chip, or multiple sampling chips, communication harnesses, and isolation components to achieve high-precision and high-reliability data acquisition and transmission.

[0079] 3) Wireless communication component: In this application, it specifically refers to a communication module that uses wireless coil coupling for signal transmission. It includes a transmitting coil (TX coil) and a receiving coil (RX coil), and realizes data transmission between corresponding sampling components of adjacent battery modules through the principle of electromagnetic induction, avoiding the use of traditional transformers and wiring harnesses.

[0080] 4) Modulation component: Used to convert the digital signal acquired by the sampling component into a high-frequency carrier signal for transmission through the transmitting coil. This process typically includes steps such as digital-to-analog conversion and frequency modulation.

[0081] 5) Demodulation component: Corresponding to the modulation component, it is used to restore the received high-frequency carrier signal to the original digital signal for processing by the sampling component or control component.

[0082] 6) Capacitive isolation: A capacitor-based electrical isolation method commonly used in analog front-ends (AFEs) to enable signal transmission between different circuit regions while maintaining high-voltage isolation. Compared to traditional magnetic isolation (such as transformers), capacitive isolation is smaller, less expensive, and easier to integrate.

[0083] 7) Wireless coil coupling: refers to the non-contact transmission of energy or signals through the electromagnetic field generated between two coils that are close to each other. For example, in this application, a wireless transmitting coil and a wireless receiving coil are used to achieve wireless data transmission through mutual inductance, thereby achieving physical isolation and simplifying wiring.

[0084] 8) Distributed AFE Architecture: A distributed AFE (Analog Front End) architecture refers to distributing multiple AFE chips across different battery modules, rather than concentrating them on a single circuit board. This approach improves system redundancy and reliability, while also facilitating expansion and maintenance.

[0085] In related technologies, communication between modules in a battery management system (BMS) typically relies on transformers for electrical isolation, but this method suffers from problems such as large size, high cost, and complex assembly. Especially in power battery systems, with increasing energy density and increasingly scarce space resources, traditional transformers are no longer sufficient to meet design requirements. Furthermore, the complex manufacturing process and difficult maintenance of transformers contribute to the high overall system cost.

[0086] In view of this, embodiments of this application provide a battery device, such as... Figure 1 and Figure 2 As shown, the battery device 10 includes:

[0087] Multiple battery modules 11 are connected in series, and each battery module 11 includes multiple battery cells 111 connected in series.

[0088] Multiple sampling components 12 correspond one-to-one with multiple battery modules 11. Each sampling component 12 is set on the corresponding battery module 11 and is used to collect and process the status information of each cell 111 in the corresponding battery module 11.

[0089] Multiple first wireless communication components 13 are connected one-to-one with multiple sampling components 12. The sampling components 12 on adjacent battery modules 11 are isolated from each other by coil coupling through the first wireless communication components 13.

[0090] Here, the battery module 11 is a modular unit composed of multiple battery cells 111 connected in series, and is the basic building block of the entire battery device 10.

[0091] The sampling component 12 is a hardware module installed on the battery module 11. Each sampling component 12 on the battery module 11 can operate independently. The sampling component 12 can collect status information such as voltage, current, and / or temperature of each cell 111 in the corresponding battery module 11. It has functions such as voltage acquisition and temperature monitoring of its battery module 11, and can interact with sampling components 12 on other battery modules or the control components of the battery management system via communication. For example, in the power battery pack of an electric vehicle, it typically consists of dozens or even hundreds of cells. The cells in the electric vehicle power battery pack are divided into several battery modules, each containing 5 to 10 cells connected in series, so that the battery modules can adapt to the energy requirements and space layout of different vehicle models.

[0092] In some implementations, the sampling component 12 may include components such as an AFE chip, a digital processor, and a communication interface. For example, in a distributed BMS architecture, each sampling component 12 is equipped with a 4-channel AFE chip, which can simultaneously acquire the voltage of 4 cells and convert the voltage into a digital signal through the internal analog-to-digital converter (ADC) of the AFE chip for subsequent processing.

[0093] The sampling component 12 can be disposed at any suitable location on the battery module 11, and this embodiment of the application does not limit this. For example, the sampling component 12 can be disposed on the top surface and / or side surface of the battery module 11.

[0094] In some implementations, the sampling component 12 can be integrated onto a circuit board on the battery module 11 for easy maintenance and replacement.

[0095] The first wireless communication component 13 is a communication module that uses wireless coil coupling for data transmission. For example, the first wireless communication component 13 includes a first wireless transmitting coil (TX coil) and a first wireless receiving coil (RX coil). Using the first wireless transmitting coil and the first wireless receiving coil, data transmission between adjacent battery modules can be achieved through the principle of electromagnetic induction. This communication method using wireless coil coupling eliminates the need for traditional transformers or physical wiring harnesses, reducing system size and weight and improving assembly efficiency. For example, in an exemplary power battery pack, the communication distance between adjacent battery modules 11 is approximately 5 mm, and the coil diameter is 6 mm. Signal transmission is achieved by printing copper coils on a circuit board. This method effectively improves upon the problems of large transformer size and high cost in traditional transformer connection schemes based on magnetic core windings.

[0096] Understandably, the first wireless communication component 13 achieves data transmission between adjacent battery modules 11 through coil mutual inductance. This isolated communication method eliminates the need for additional wiring and soldering, thereby significantly simplifying the battery assembly process and improving production efficiency. Furthermore, since wireless communication is unaffected by mechanical stress, the first wireless communication component 13 is less prone to damage during frequent disassembly or maintenance, thus significantly improving system reliability and ease of maintenance.

[0097] Based on the aforementioned technical means, multiple sampling components are used to collect the status information of the cells in each battery module, and coil-coupled isolated communication is achieved through a first wireless communication component. This avoids the problems of large size, high cost, and difficult assembly and maintenance associated with traditional transformer isolation methods. Furthermore, using coil-coupled communication instead of wiring harnesses and connectors reduces space occupation and improves system integration, thereby increasing the energy density of the battery system and reducing manufacturing and maintenance costs.

[0098] In some embodiments, the battery device 10 includes a power battery device.

[0099] It is understandable that the overall size of the power battery device is limited by the application scenario, and the application scenario of the power battery device requires a large energy density.

[0100] In some embodiments, such as Figure 3 As shown, each first wireless communication component 13 includes a first wireless receiving coil 131 for receiving data and a first wireless transmitting coil 132 for transmitting data;

[0101] The plurality of battery modules 11 include an adjacent first battery module 11a and a second battery module 11b, and the plurality of sampling components 12 include a first sampling component 12a disposed on the first battery module 11a and a second sampling component 12b disposed on the second battery module 11b;

[0102] The first wireless transmitting coil 132 connected to the first sampling component 12a and the first wireless receiving coil 131 connected to the second sampling component 12b are arranged opposite to each other.

[0103] In this embodiment, the first wireless transmitting coil 132 is responsible for transmitting the modulated high-frequency carrier signal, while the first wireless receiving coil 131 is responsible for capturing and decoding the modulated high-frequency carrier signal, ultimately restoring it to the original data. This coil coupling method not only achieves electrical isolation but also improves the system's voltage withstand level, making it compatible with higher voltage battery systems.

[0104] The first battery module 11a and the second battery module 11b can be any two adjacent battery modules in the battery device.

[0105] In some embodiments, the first wireless transmitting coil 132 connected to the first sampling component 12a and the first wireless receiving coil 131 connected to the second sampling component 12b can be arranged facing each other, that is, the first wireless transmitting coil 132 connected to the first sampling component 12a and the first wireless receiving coil 131 connected to the second sampling component 12b are completely opposite to each other.

[0106] In some embodiments, the first wireless transmitting coil 132 connected to the first sampling component 12a and the first wireless receiving coil 131 connected to the second sampling component 12b may be partially opposite to each other.

[0107] According to the above technical means, setting up a first wireless transmitting coil and a first wireless receiving coil opposite each other between the sampling components of adjacent battery modules can ensure stable signal transmission, improve communication reliability, and simplify the layout design between battery modules.

[0108] In some embodiments, such as Figure 4 As shown, multiple battery modules 11 are arranged along the target direction X, and each battery module 11 has a first end face A1 and a second end face A2 that are arranged opposite to each other along the target direction X.

[0109] The first wireless receiving coil 131 and the first wireless transmitting coil 132 connected to each sampling component 12 are respectively located on the first end face A1 and the second end face A2 of the battery module 11 where the sampling component 12 is located.

[0110] Here, the first wireless receiving coil 131 and the first wireless transmitting coil 132 can be respectively set at any suitable position on the first end face A1 and the second end face A2 of the corresponding battery module 11. The first wireless receiving coil 131 and the first wireless transmitting coil 132 only need to be set opposite each other to communicate with each other.

[0111] According to the above technical means, the first wireless receiving coil and the first wireless transmitting coil are respectively set on the two ends of the battery module, which facilitates the alignment between battery modules and the communication of corresponding sampling components, can further optimize space utilization, and support the modular installation of battery devices.

[0112] In some embodiments, such as Figure 5 As shown, the battery device 10 also includes:

[0113] A first circuit board 14 is provided on the first end face A1 of the battery module 11 where each sampling component 12 is located, and the first wireless receiving coil 131 connected to the sampling component 12 is provided on the first circuit board 14.

[0114] A second circuit board 15 is provided on the second end face A2 of the battery module 11 where each sampling component 12 is located, and the first wireless transmitting coil 132 connected to the sampling component 12 is provided on the second circuit board 15.

[0115] Here, the first circuit board 14 and the second circuit board 15 may be at least one of the following: printed circuit board (PCB), flexible printed circuit (FPC), flexible die-cutting circuit (FDC).

[0116] In some embodiments, a third circuit board is also provided on the battery module 11, and the sampling component 12 is disposed on the third circuit board. The first circuit board 14, the second circuit board 15, and the third circuit board disposed on the same battery module 11 can be connected to form a single circuit board, or they can be three separate circuit boards; this application embodiment does not limit this.

[0117] By integrating the wireless communication coils onto the circuit boards on both ends of the battery module using the aforementioned technical means, structural stability can be improved and the electrical connection performance between the coils and the circuit can be enhanced.

[0118] In some embodiments, the first wireless receiving coil 131 is printed on the first circuit board 14;

[0119] The first wireless transmitting coil 132 is printed on the second circuit board 15.

[0120] According to the above-mentioned technical means, the first wireless receiving coil and the first wireless transmitting coil are integrated on the second circuit board by printing, which not only further reduces the size of the first wireless receiving coil and the first wireless transmitting coil, but also improves production efficiency, reduces manufacturing costs, and enhances the consistency and stability of the coil.

[0121] In some embodiments, such as Figure 6 As shown, each first wireless communication component 13 further includes:

[0122] The modulation component 133 is disposed between the first wireless transmitting coil 132 and the sampling component 12, and is used to modulate the state information of the battery cell 111 collected by the sampling component 12 into a carrier signal, and transmit the modulated carrier signal through the first wireless transmitting coil 132.

[0123] The demodulation component 134 is disposed between the first wireless receiving coil 131 and the sampling component 12, and is used to demodulate the carrier signal received by the first wireless receiving coil 131 and transmit it to the sampling component 12.

[0124] The modulation component 133 can be used to convert the digital signal acquired by the sampling component 12 into a high-frequency carrier signal for transmission via the first wireless transmission coil 132. The process by which the modulation component 133 converts the digital signal acquired by the sampling component 12 into a high-frequency carrier signal may include steps such as digital-to-analog conversion and frequency modulation. For example, in a certain BMS system, the modulation component 133 converts the 12-bit digital voltage value from the sampling component into an analog signal within a specific frequency range, and then transmits it via the first wireless transmission coil 132 to the sampling component 12 located on the adjacent battery module 11.

[0125] The demodulation component 134 corresponds to the modulation component 133 and is used to restore the received high-frequency carrier signal to the original digital signal for processing by the sampling component 12 or the control component. For example, in a distributed BMS system, the demodulation component 134 restores the high-frequency signal to the original voltage value through a low-pass filter and a comparator, ensuring the accuracy and stability of data transmission.

[0126] Based on the above-mentioned technical means, the conversion between digital signals and analog carrier signals can be achieved through modulation and demodulation components, which can effectively improve communication quality and ensure the integrity and accuracy of signals during wireless transmission.

[0127] In some embodiments, such as Figure 7 and Figure 8 As shown, the battery device 10 also includes:

[0128] Control component 16, and a second wireless communication component 17 connected to control component 16;

[0129] The control component 16 communicates with the first wireless communication component 13 via the second wireless communication component 17 in a coil-coupled manner, and is isolated from the sampling component 12.

[0130] Here, the control component 16 can communicate in isolation with at least one sampling component 12 through the second wireless communication component 17 to send sampling control commands to at least one sampling component 12 or to obtain the cell status information collected by at least one sampling component 12.

[0131] In some implementations, the control component 16 may be the master control unit in the BMS, such as the Battery Management Unit (BMU).

[0132] In some implementations, the control component can acquire the temperature, voltage, current and other status information of each cell in real time through the second wireless communication component 17, use the status information to estimate the state of charge (SOC) and state of health (SOH) of the cell, estimate the overall SOC and SOH of the battery device, monitor the battery operating status, and control the charging and discharging of the connected cells. When the cell parameters are abnormal, the fault can also be reported to the vehicle controller.

[0133] The second wireless communication component 17 is a communication module that uses wireless coil coupling for data transmission. For example, the second wireless communication component 17 includes a second wireless transmitting coil and a second wireless receiving coil. Using the second wireless transmitting coil and the second wireless receiving coil, data transmission between the control component 16 and the sampling component 12 can be achieved through the principle of electromagnetic induction.

[0134] Based on the above technical means, the control component communicates with the sampling component in isolation through the second wireless communication component, which makes the whole system have higher security and anti-interference capabilities, while also improving the overall communication architecture flexibility of the system and reducing the size of the communication component on the control component side.

[0135] In some embodiments, such as Figure 9 As shown, the multiple sampling components 12 include a third sampling component 12c disposed on the third battery module 11c and a fourth sampling component 12d disposed on the fourth battery module 11d. The third battery module 11c and the fourth battery module 11d are the first battery module and the last battery module in the multiple battery modules 11 connected in series, respectively.

[0136] The second wireless communication component 17 includes a second wireless receiving coil 171 for receiving data and a second wireless transmitting coil 172 for transmitting data. The second wireless transmitting coil 172 connected to the control component 16 is disposed opposite to the first wireless receiving coil 131 connected to the third sampling component 12c. The second wireless receiving coil 171 connected to the control component 16 is disposed opposite to the first wireless transmitting coil 132 connected to the fourth sampling component 12d.

[0137] Here, the control component 16 can send data to the sampling component (i.e., the third sampling component 12c) set on the first battery module of the series-connected multiple battery modules 11 through the second wireless transmitting coil 172. The third sampling component 12c can communicate in isolation with the sampling components set on the adjacent battery modules through the first wireless transmitting coil 132. The sampling component (i.e., the fourth sampling component 12d) set on the last battery module of the series-connected multiple battery modules 11 can send data to the control component 16 through the first wireless transmitting coil 132.

[0138] For example, control component 16 can send a sampling control command to third sampling component 12c via second wireless transmitting coil 172; after receiving the sampling control command via connected first wireless receiving coil 131, third sampling component 12c collects the status information of each cell in third battery module 11c based on the sampling control command, and sends the sampling control command and the collected status information of each cell to sampling component 12 on the next battery module via connected first wireless transmitting coil 132, so that sampling component 12 on the next battery module collects the status information of each cell in its battery module 11 based on the sampling control command, and sampling component 12 on the next battery module transmits the sampling control command and the currently collected status information of each cell to the next battery module. The status information of the first sampling module 12d and the status information of each cell collected by the third sampling module 12c are transmitted to the sampling module 12 set on the next battery module through the first wireless transmitting coil 132. Similarly, after the fourth sampling module 12d receives the sampling control command through the first wireless receiving coil 131, it collects the status information of each cell in the fourth battery module 11d based on the sampling control command, and transmits the currently collected status information of each cell and the received status information of each cell to the control module 16 through the first wireless transmitting coil 132. The control module 16 can receive the status information of all cells 111 in each battery module 11 collected by each sampling module 12 through the second wireless receiving coil 171.

[0139] In some embodiments, the battery device 10 has a housing for accommodating at least a plurality of battery modules 11, a plurality of sampling components 12, a plurality of first wireless communication components 13, and a second wireless communication component 17. The second wireless receiving coil 171 and the second wireless transmitting coil 172 in the second wireless communication component 17 may be disposed on the inner wall of the housing and disposed opposite to the first wireless transmitting coil 132 and the first wireless receiving coil 131 of the third sampling component 12c, respectively.

[0140] In some embodiments, each second wireless communication component further includes: a modulation component disposed between the second wireless transmitting coil 172 and the control component 16, for modulating the control command generated by the control component 16 into a carrier signal and transmitting the modulated carrier signal through the second wireless transmitting coil 172; and a demodulation component disposed between the second wireless receiving coil 171 and the control component 16, for demodulating the carrier signal received by the second wireless receiving coil 171 and transmitting it to the control component 16.

[0141] Based on the above technical means, by setting up sampling components on the first and last battery modules and establishing a wireless communication link with the control components, the centralized control and distributed sampling of the entire battery system are organically combined, thereby improving the reliability and response speed of the system operation.

[0142] In some embodiments, such as Figure 10 As shown, each sampling component 12 includes:

[0143] Multiple sampling chips 121, communication harness 122, and at least one isolation capacitor C;

[0144] Each sampling chip 121 is used to collect and process the status information of some cells 111 in the corresponding battery module 11. Multiple sampling chips 121 in the same sampling component 12 are connected in sequence through a communication harness 122. An isolation capacitor C is provided on the communication harness 122 between two adjacent sampling chips 121.

[0145] Here, an isolation capacitor is a capacitor used to achieve electrical isolation in communication links between sampling chips, enabling signal transmission between different circuit regions while maintaining high-voltage isolation. Compared to traditional magnetic isolation (such as transformers), isolation capacitors are smaller, less expensive, and easier to integrate. For example, in a distributed AFE architecture, isolation capacitors are used in daisy-chain communication lines to ensure high-voltage electrical signal isolation between sampling chips without affecting data transmission rates.

[0146] The communication harness 122 may include any suitable harness with communication capability, and this embodiment of the application does not limit this.

[0147] In some embodiments, the communication harness 122 includes daisy-chain communication lines. The daisy-chain communication lines can connect the various sampling chips 121 in the same sampling assembly 12 together in series.

[0148] Based on the above technical means, multiple sampling chips in the same sampling component are connected and work together through a communication harness. By adding an isolation capacitor to the communication harness, different potential regions can be effectively isolated while maintaining signal transmission efficiency and reliability, thereby improving system security and stability.

[0149] The following describes the application of the battery device provided in the embodiments of this application in a real-world scenario.

[0150] In related technologies, the distributed AFE architecture uses transformer isolation between sampling components corresponding to different battery modules, which has problems such as large size, high cost, and difficulty in assembly and maintenance.

[0151] This application proposes a battery device that utilizes a combination of capacitive isolation and wireless coil coupling to replace traditional transformer isolation and wiring harness connections. Specifically, sampling components within the same battery module employ capacitive isolation for daisy-chain communication, while sampling components from different battery modules transmit signals via wireless coils printed on a PCB or FPC. This design significantly reduces system size and cost, while also improving assembly efficiency and system voltage withstand capability, making it suitable for higher voltage battery systems.

[0152] This application's embodiments effectively address the problems of large size, high cost, and difficult assembly and maintenance in existing battery management systems by introducing wireless coil coupling communication technology and capacitor isolation technology, achieving a more efficient, safer, and cost-effective battery management solution. On one hand, there is no need for physical connections between sampling components corresponding to different battery modules, significantly reducing system size and weight, while also lowering manufacturing costs. On the other hand, since the wireless coil coupling communication connection uses air as an isolation medium, the system's voltage withstand capability is significantly improved, enabling it to adapt to battery systems with higher voltage levels. Furthermore, printing the wireless coil directly on the PCB or FPC board eliminates the need for soldering, greatly simplifying the assembly process and improving production efficiency and ease of subsequent maintenance.

[0153] To further optimize communication stability and efficiency, the wireless coil is integrated onto the FPC or PCB board and attached to the side of each sampling module. This design not only reduces reliance on external components but also facilitates future replacement and maintenance.

[0154] In summary, the embodiments of this application successfully overcome many limitations of traditional battery management systems through an innovative isolated communication method, demonstrating promising application prospects and technological promotion value. In the future, the coil layout, signal frequency, and modulation method can be expanded and optimized according to actual needs to adapt to more complex application scenarios.

[0155] This application provides an embodiment of an electrical device, such as... Figure 11 As shown, the electrical device 200 includes the battery device 10 described in the above embodiments.

[0156] Here, electrical equipment can be any electrical equipment, including but not limited to automobiles, airplanes, electric bicycles, electric motorcycles, electric boats, and / or ships.

[0157] It should be noted that the descriptions of the various embodiments above tend to emphasize the differences between them, while their similarities or commonalities can be referred to interchangeably. The descriptions of the electrical equipment embodiments above are similar to those of the battery device embodiments above, and have similar beneficial effects. For technical details not disclosed in the electrical equipment embodiments of this application, please refer to the descriptions of the battery device embodiments of this application for understanding.

[0158] It should be understood that in the description of this application, the reference to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "yet another embodiment," "in some implementations," "in other implementations," or "exemplary," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0159] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0160] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and devices can be implemented in other ways. The apparatus and device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0161] The above are merely exemplary embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Multiple battery modules are connected in series, and each battery module includes multiple battery cells connected in series. Multiple sampling components are provided, each corresponding to one of the multiple battery modules. Each sampling component is set on the corresponding battery module and is used to collect and process the status information of each cell in the corresponding battery module. Multiple first wireless communication components are connected one-to-one with the multiple sampling components. The sampling components on adjacent battery modules are isolated from each other by coil coupling through the first wireless communication components. Each first wireless communication component includes a first wireless receiving coil for receiving data and a first wireless transmitting coil for transmitting data.

2. The battery device according to claim 1, characterized in that, The plurality of battery modules include an adjacent first battery module and a second battery module, and the plurality of sampling components include a first sampling component disposed on the first battery module and a second sampling component disposed on the second battery module; The first wireless transmitting coil connected to the first sampling component and the first wireless receiving coil connected to the second sampling component are arranged opposite to each other.

3. The battery device according to claim 2, characterized in that, The plurality of battery modules are arranged along the target direction, and each battery module has a first end face and a second end face that are disposed opposite to each other along the target direction; The first wireless receiving coil and the first wireless transmitting coil connected to each of the sampling components are respectively disposed on the first end face and the second end face of the battery module where the sampling component is located.

4. The battery device according to claim 3, characterized in that, The battery device also includes: A first circuit board is provided on the first end face of the battery module where each sampling component is located, and the first wireless receiving coil connected to the sampling component is provided on the first circuit board; A second circuit board is provided on the second end face of the battery module where each sampling component is located, and the first wireless transmitting coil connected to the sampling component is provided on the second circuit board.

5. The battery device according to claim 4, characterized in that, The first wireless receiving coil is printed on the first circuit board; The first wireless transmitting coil is printed on the second circuit board.

6. The battery device according to claim 2, characterized in that, Each of the first wireless communication components further includes: A modulation component is disposed between the first wireless transmitting coil and the sampling component, and is used to modulate the cell status information collected by the sampling component into a carrier signal, and transmit the modulated carrier signal through the first wireless transmitting coil; A demodulation component is disposed between the first wireless receiving coil and the sampling component, and is used to demodulate the carrier signal received by the first wireless receiving coil and then transmit it to the sampling component.

7. The battery device according to claim 2, characterized in that, The battery device also includes: A control component, and a second wireless communication component connected to the control component; The control component communicates with the first wireless communication component via the second wireless communication component, and is isolated from the sampling component by coil coupling.

8. The battery device according to claim 7, characterized in that, The plurality of sampling components include a third sampling component disposed on a third battery module and a fourth sampling component disposed on a fourth battery module, wherein the third battery module and the fourth battery module are respectively the first battery module and the last battery module in the plurality of battery modules connected in series; The second wireless communication component includes a second wireless receiving coil for receiving data and a second wireless transmitting coil for transmitting data. The second wireless transmitting coil connected to the control component is disposed opposite to the first wireless receiving coil connected to the third sampling component, and the second wireless receiving coil connected to the control component is disposed opposite to the first wireless transmitting coil connected to the fourth sampling component.

9. The battery device according to any one of claims 1 to 8, characterized in that, Each of the sampling components includes: Multiple sampling chips, communication harness, and at least one isolation capacitor; Each of the sampling chips is used to collect and process the status information of some cells in the corresponding battery module. Multiple sampling chips in the same sampling component are connected in sequence through the communication harness, and the isolation capacitor is provided on the communication harness between two adjacent sampling chips.

10. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1 to 9.

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