Battery cell unit and energy storage system

Abstract

The utility model discloses a battery cell unit and an energy storage system, and belongs to the technical field of battery cells. Each battery cell unit comprises a battery cell body; a first wireless transmission device configured to couple or decouple the energy signal and the communication signal, and transmit the energy signal and the communication signal based on a wireless transmission medium; the first transceiving unit is connected with the first wireless transmission device and is configured to transmit the energy signal and the communication signal; the first equalization control unit is connected with the first transceiving unit and the battery cell body, and is configured to discharge or charge the battery cell body based on the energy signal; and a first modulation or demodulation unit connected with the first transmit-receive unit and configured to modulate or demodulate the communication signal. The energy signals and the communication signals are coupled or decoupled through the wireless transmission device, and are transmitted in a wireless mode, so that non-contact data and energy simultaneous transmission is realized, the flexibility of battery cell configuration is improved, and the integration level and convenience of the energy storage system are facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery cells, and particularly relates to a battery cell unit and an energy storage system. BACKGROUND

[0002] Traditional battery cells communicate with the outside and perform energy balancing mostly in a wired form, which brings about complex wiring, space occupation, poor flexibility, great maintenance difficulty and limited upgrade. Currently, some battery cells use a wireless communication scheme to reduce wiring, but energy balancing can be achieved in a wired manner, and various problems caused by wired connection still exist. CONTENT OF THE UTILITY MODEL

[0003] The application aims to at least solve one of the technical problems in the prior art. To this end, the application provides a battery cell unit and an energy storage system to transmit energy signals and communication signals in a wireless form, realize non-contact energy and signal transmission, and improve the flexibility of battery cell configuration.

[0004] In a first aspect, the application provides a battery cell unit, comprising:

[0005] a battery cell body;

[0006] a first wireless transmission device configured to couple or decouple energy signals and communication signals, and transmit the energy signals and the communication signals based on a wireless transmission medium;

[0007] a first transceiver unit connected with the first wireless transmission device and configured to transmit the energy signals and the communication signals;

[0008] a first balancing control unit connected with the first transceiver unit and the battery cell body, and configured to discharge or charge the battery cell body based on the energy signals;

[0009] a first modulation or demodulation unit connected with the first transceiver unit and configured to modulate or demodulate the communication signals.

[0010] According to an embodiment of the application, the first wireless transmission device comprises:

[0011] a wireless transmission medium generating component and a wireless transmission medium receiving component;

[0012] an energy processing unit connected with the wireless transmission medium generating component and the first transceiver unit, and configured to emit the energy signals through the wireless transmission medium generating component;

[0013] a communication processing unit connected with the wireless transmission medium generating component and the first transceiver unit, and configured to emit the communication signals through the wireless transmission medium generating component;

[0014] an energy receiving unit, connected to the wireless transmission medium receiving component and the first transceiver unit, respectively, and configured to receive the energy signal through the wireless transmission medium generating component;

[0015] The communication receiving unit is connected to the wireless transmission medium receiving component and the first transceiver unit respectively, and is configured to receive the communication signal through the wireless transmission medium generating component.

[0016] According to one embodiment of the present application, the energy processing unit includes a first converter and a first transmitter connected in sequence, the first converter receives the energy signal, and the first transmitter is connected to the wireless transmission medium generating component;

[0017] The energy receiving unit includes an impedance matching unit, a voltage multiplying unit and a DC output unit which are connected in sequence. The impedance matching unit is connected to the wireless transmission medium receiving component, and the DC output unit is connected to the first transceiver unit.

[0018] According to one embodiment of the present application, the communication processing unit includes a second converter and a second transmitter connected in sequence, the second converter receives the communication signal, and the second transmitter is connected to the wireless transmission medium generating component;

[0019] The communication receiving unit includes a receiver and a third converter which are connected in sequence. The receiver is connected to the wireless transmission medium receiving component, and the third converter is connected to the first transceiver unit.

[0020] According to an embodiment of the present application, the first wireless transmission device uses electromagnetic waves, visible light, ultrasonic waves or radio frequency signals to transmit signals.

[0021] According to one embodiment of the present application, the first transceiver unit includes:

[0022] The rectifier and inverter units are connected to the first balancing control unit and the first wireless transmission device respectively;

[0023] The signal transmission unit is connected to the first modulation or demodulation unit and the first wireless transmission device respectively.

[0024] According to one embodiment of the present application, the battery cell unit further includes:

[0025] A sampling and monitoring unit configured to detect status information of the battery cell body;

[0026] The cell control chip is connected to the sampling and monitoring unit, the first balancing control unit and the first modulation or demodulation unit.

[0027] In a second aspect, the present application provides an energy storage system, including a plurality of battery clusters, each battery cluster including a plurality of battery core units according to the aforementioned method, wherein the battery core units in the battery cluster are connected in series.

[0028] According to one embodiment of the present application, the energy storage system further comprises a master control unit, which is coupled with the first wireless transmission device in each battery cell unit respectively to transmit the energy signal and the communication signal.

[0029] According to one embodiment of the present application, the master control unit comprises:

[0030] a second wireless transmission device, which is coupled with the first wireless transmission device in each battery cell unit;

[0031] a second transceiver unit, which is connected with the first wireless transmission device;

[0032] a second equalization control unit and a second modulation or demodulation unit, which are connected with the second transceiver unit;

[0033] a master control chip, which is connected with the second transceiver unit, the second equalization control unit and the second modulation or demodulation unit respectively.

[0034] According to the battery cell unit and the energy storage system of the present application, the energy signal and the communication signal are coupled or decoupled by the wireless transmission device and transmitted in a wireless form, realizing the non-contact energy and signal transmission, improving the flexibility of battery cell configuration and being beneficial to the integration and convenience of the energy storage system.

[0035] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0037] Figure 1 is one of the structural schematic diagrams of the battery cell unit provided by the embodiments of the present application;

[0038] Figure 2 is the structural schematic diagram of the wireless transmission device provided by the embodiments of the present application;

[0039] Figure 3 is the second structural schematic diagram of the battery cell unit provided by the embodiments of the present application;

[0040] Figure 4 is one of the architectures of the energy storage system provided by the embodiments of the present application;

[0041] Figure 5 is the equalization control flowchart of the energy storage system provided by the embodiments of the present application;

[0042] Figure 6 is the second architecture of the energy storage system provided by the embodiments of the present application;

[0043] Figure 7 is a third architecture of the energy storage system provided by the embodiments of the present application;

[0044] Figure 8 is a fourth architecture of the energy storage system provided by the embodiments of the present application;

[0045] Figure 9 is a fifth architecture of the energy storage system provided by the embodiments of the present application.

[0046] Reference signs:

[0047] cell unit 10, first wireless transmission device 110, wireless transmission medium generating component 111, wireless transmission medium receiving component 112, energy processing unit 113, first transformer 1131, first transmitter 1132, communication processing unit 114, second transformer 1141, second transmitter 1142, energy receiving unit 115, impedance matching unit 1151, voltage multiplying unit 1152, direct current output unit 1153, communication receiving unit 116, receiver 1161, third transformer 1162, first transceiver unit 120, rectification and inversion unit 121, signal transmission unit 122, first equalization control unit 130, first modulation or demodulation unit 140, sampling monitoring unit 150, cell control chip 160;

[0048] master control unit 20, second wireless transmission device 210, second transceiver unit 220, second equalization control unit 230, second modulation or demodulation unit 240, master control chip 250, storage unit 260. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0050] In the following description, “circuit” refers to a conductive loop composed of at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is said to be “coupled to” or “connected to” another element or said element / circuit is “coupled between” or “connected between” two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between elements can be physical, logical, or a combination thereof. On the contrary, when an element is said to be “directly coupled to” or “directly connected to” another element, it means that there is no intermediate element between the two.

[0051] In the description, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the numerical descriptors used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in an "or" relationship.

[0052] In addition, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] In the related art, energy transmission and data transmission between energy storage cells are completed through wire harness connection to realize the functions of balancing, energy storage and communication; the traditional wired transmission system has complex wiring, occupies space, poor flexibility, high maintenance difficulty and limited upgrade. In view of the current intelligent development trend of energy storage products, the new energy market has a cell scheme using wireless communication instead of wired communication, but still realizes energy transmission through wired mode, without avoiding various problems caused by contact connection, and finally difficult to realize the demand of non-physical contact and intelligence.

[0054] The present application provides a cell unit 10 and an energy storage system, which couples or decouples energy signals and communication signals through a wireless transmission device, and transmits in a wireless form, realizes non-contact energy and communication transmission, improves the flexibility of cell configuration, and is beneficial to the integration and convenience of the energy storage system.

[0055] Reference Figure 1 , Figure 1The structure of a battery cell unit 10 is shown. An embodiment of the present application proposes a battery cell unit 10. In this embodiment, the battery cell unit 10 includes a battery cell body (not shown in the figure), a first wireless transmission device 110, a first transceiver unit 120, a first equalization control unit 130 and a first modulation or demodulation unit 140. The first wireless transmission device 110 is configured to couple or decouple energy signals and communication signals, and transmit energy signals and communication signals based on a wireless transmission medium; the first transceiver unit 120 is connected to the first wireless transmission device 110 and is configured to transmit energy signals and communication signals; the first equalization control unit 130 is respectively connected to the first transceiver unit 120 and the battery cell body, and is configured to discharge or charge the battery cell body based on the energy signal; the first modulation or demodulation unit 140 is connected to the first transceiver unit 120 and is configured to modulate or demodulate the communication signal.

[0056] The battery cell converts chemical energy into electrical energy through chemical reactions and is responsible for storing and releasing the electrical energy when needed. The battery cell has positive and negative tabs to enable electrical energy transmission. A battery cell 10 can connect to other battery cells 10 via the positive and negative tabs. For example, the first balancing control unit 130 can be connected to the positive and negative tabs of the battery cell to enable energy transmission.

[0057] Battery cells 10 are typically configured into an energy storage system, comprising multiple battery clusters. Each battery cluster includes multiple battery cells 10, with each battery cell 10 connected in series. To improve the consistency of each battery cell 10 in the energy storage system, each battery cell 10 is equipped with an energy balancing function to adjust for energy differences between cells and improve the overall performance of the battery pack. Energy storage systems typically utilize active balancing control, achieving balancing by transferring energy between battery cells 10 rather than consuming it, thus reducing energy waste.

[0058] The first balancing control unit 130 performs balancing control by discharging or charging the battery cells. During discharge, the first balancing control unit 130 absorbs electrical energy from the battery cells and transmits it to the first transceiver unit 120. During charging, the first balancing control unit 130 absorbs electrical energy from the first transceiver unit 120 and transmits it to the battery cells.

[0059] As an example, the first balancing control unit 130 may include a switch circuit that performs a start / stop control function for the balancing control function. The first balancing control unit 130 may also include an energy storage unit, such as a capacitor, to temporarily store electrical energy and facilitate electrical energy transfer.

[0060] The first modulation or demodulation unit 140 is configured to modulate various types of data of the battery cell unit 10 into a signal for transmission, or to demodulate various types of data from a received signal. The various types of data can include information such as voltage or current of the battery cell body, and can also include equalization control information such as charge or discharge amount. The first modulation or demodulation unit 140 realizes information communication of the battery cell unit 10 by converting data and signals, facilitating functions such as real-time monitoring, data acquisition, equalization control, and fault diagnosis of the energy storage system.

[0061] As an example, the first modulation or demodulation unit 140 can include a modulator and a demodulator. The modulator is configured to convert a baseband signal (such as an analog or digital signal of voltage, current, temperature, etc. of the battery cell) into a signal suitable for transmission, and the adjustment method can include modulation methods such as frequency modulation (FM), amplitude modulation (AM), phase modulation (PM), etc. The demodulator is the inverse process of the modulator, and is configured to restore the original baseband signal from the received modulated signal. The demodulator needs to accurately extract useful information from the received signal to recover the original voltage, current, temperature, etc. parameters, and the demodulation method corresponds to the modulation method.

[0062] In addition, the first modulation or demodulation unit 140 can also include an amplifier, a filter, or a converter, etc. The amplifier increases the amplitude and intensity of the signal, so that the subsequent circuit can be more easily processed and recognized. The amplifier needs to have sufficient gain and stability to ensure that the signal is not lost during transmission. The filter is used to filter out noise and interference in the signal, and to improve the signal-to-noise ratio and transmission quality of the signal. The converter can convert an analog signal to a digital signal (ADC) or convert a digital signal to an analog signal in some cases.

[0063] The first transceiver unit 120 is configured to convert the electrical energy output by the first equalization control unit 130 into a form suitable for transmission, or to convert the received electrical energy into a form suitable for input to the battery cell body, such as voltage conversion or AC / DC conversion, etc. The first transceiver unit 120 can also convert the signals output or input by the first modulation or demodulation unit 140, facilitating transmission or demodulation.

[0064] The first wireless transmission device 110 is configured to realize simultaneous transmission of data and energy, so that the battery cell unit 10 exchanges data while receiving energy, improving the integration and convenience of the system. In some embodiments, the first wireless transmission device 110 can use electromagnetic waves, visible light, ultrasonic waves, or radio frequency signals for signal transmission.

[0065] As an example, the first wireless transmission device 110 uses electromagnetic resonance coupling to achieve simultaneous transmission of data and energy. Through two coils tuned to the same frequency (one as a transmitter and one as a receiver), energy is transmitted through a non-radiative magnetic field. At the same time, by adjusting the circuit parameters, data signals can be superimposed on the energy transmission channel using signal modulation techniques while maintaining high energy transmission efficiency. In this example, the coupling method of energy signals and communication information can be frequency division multiplexing, time division multiplexing, or carrier modulation. The energy and signal transmission structure using coils is simple, easy to deploy, and relatively low cost.

[0066] As another example, the first wireless transmission device 110 can include a light-emitting element (such as an LED lamp) and a photovoltaic cell, and use the light emitted by the LED lamp to both transmit data (LiFi technology) and provide energy for devices such as photovoltaic cells. The coupling method of energy signals and communication information can also be frequency division multiplexing, time division multiplexing, or carrier modulation. The LiFi technology used to implement energy and signal transmission has a fast transmission speed and high stability.

[0067] As another example, the first wireless transmission device 110 can include an ultrasonic generator and receiver, and use the propagation characteristics of ultrasonic waves in a medium to simultaneously transmit energy and encoded data. By controlling the frequency, phase, and amplitude of the ultrasonic waves, information encoding and decoding can be achieved. The use of ultrasonic waves to implement energy and signal transmission has strong directivity, making it easy to ensure transmission in a specific direction and less susceptible to interference.

[0068] As another example, the first wireless transmission device 110 can include a radio frequency identification module (RFID) and a near field communication module (NFC). By using RFID technology and NFC technology to achieve data transmission and energy supply for low-power devices, a high-frequency electromagnetic field is used to power the tag (or embedded device) and exchange data through radio frequency signals. In some designs, it can be optimized to provide sufficient energy for device operation and data transmission at the same time. The use of radio frequency technology to implement energy and signal transmission has a wide range and flexible networking.

[0069] Referring to Figure 2 , Figure 2The structure of a wireless transmission device is shown. In some embodiments, the first wireless transmission device includes a wireless transmission medium generating component 111, a wireless transmission medium receiving component 112, an energy processing unit 113, a communication processing unit 114, an energy receiving unit 115, and a communication receiving unit 116; the energy processing unit 113 is connected to the wireless transmission medium generating component 111 and the first transceiver unit 120 respectively, and is configured to transmit an energy signal through the wireless transmission medium generating component 111; the communication processing unit 114 is connected to the wireless transmission medium generating component 111 and the first transceiver unit 120 respectively, and is configured to transmit a communication signal through the wireless transmission medium generating component 111; the energy receiving unit 115 is connected to the wireless transmission medium receiving component 112 and the first transceiver unit 120 respectively, and is configured to receive an energy signal through the wireless transmission medium generating component 112; the communication receiving unit 116 is connected to the wireless transmission medium receiving component 112 and the first transceiver unit 120 respectively, and is configured to receive a communication signal through the wireless transmission medium generating component 112.

[0070] The wireless transmission medium generating component 111 and the wireless transmission medium receiving component 112 are determined according to the transmission adopted by the first wireless transmission device 110. For example, when the first wireless transmission device 110 adopts electromagnetic wave transmission, both the wireless transmission medium generating component 111 and the wireless transmission medium receiving component 112 can adopt a coil; when the first wireless transmission device 110 adopts visible light transmission, the wireless transmission medium generating component 111 can be a light emitting element, and the wireless transmission medium receiving component 112 can be a photocell; when the first wireless transmission device 110 adopts ultrasonic wave transmission, the wireless transmission medium generating component 111 can be an ultrasonic wave generator, and the wireless transmission medium receiving component 112 can be an ultrasonic wave receiver; when the first wireless transmission device 110 adopts radio frequency signal transmission, the wireless transmission medium generating component 111 can be a radio frequency generator, and the wireless transmission medium receiving component 112 can be a radio frequency receiver.

[0071] The energy processing unit 113 and the communication processing unit 114 are used to apply energy signals and communication signals to the wireless transmission medium generating component 111 for transmission. The energy receiving unit 115 and the communication receiving unit 116 are used to receive energy signals and communication signals from the wireless transmission medium receiving component 112. By separately processing energy and data signals, the fusion of wireless equalization and wireless communication functions is achieved, and the device no longer relies on complex wiring connections, facilitating deployment.

[0072] As an example, the energy processing unit 113 includes a first converter 1131 and a first transmitter 1132 connected in sequence, the first converter 1131 receives the energy signal, and the first transmitter 1132 is connected to the wireless transmission medium generating component 111; the energy receiving unit 115 includes an impedance matching unit 1151, a voltage multiplication unit 1152 and a DC output unit 1153 connected in sequence, the impedance matching unit 1151 is connected to the wireless transmission medium receiving component 112, and the DC output unit 1153 is connected to the first transceiver unit 120.

[0073] In this example, first converter 1131 further converts the energy signal for subsequent processing. First transmitter 1132 uses the converted signal from first converter 1131 to drive wireless transmission medium generating component 111 for signal transmission. Impedance matching unit 1151 is used to separate the energy signal from wireless transmission medium receiving component 112, boost it through voltage multiplier 1152, and output it to the backend through DC output unit 1153 for energy reception.

[0074] As an example, the communication processing unit 114 includes a second converter 1141 and a second transmitter 1142 connected in sequence, the second converter 1141 receives the communication signal, and the second transmitter 1142 is connected to the wireless transmission medium generating component 111; the communication receiving unit 116 includes a receiver 1161 and a third converter 1162 connected in sequence, the receiver 1161 is connected to the wireless transmission medium receiving component 112, and the third converter 1162 is connected to the first transceiver unit 120.

[0075] In this example, second converter 1141 further converts the communication signal for subsequent processing. Second transmitter 1142 uses the signal converted by second converter 1141 to drive wireless transmission medium generating component 111 for signal transmission. Receiver 1161 receives the communication signal from wireless transmission medium receiving component 112 and converts it into a signal suitable for back-end processing via third converter 1162, thus achieving signal reception.

[0076] Reference Figure 3 , Figure 3 The structure of a battery cell unit 10 is shown. In some embodiments, the first transceiver unit 120 includes a rectifier and inverter unit 121 and a signal transmission unit 122. The rectifier and inverter unit 121 are connected to the first balancing control unit 130 and the first wireless transmission device 110 respectively; the signal transmission unit 122 is connected to the first modulation or demodulation unit 140 and the first wireless transmission device 110 respectively.

[0077] The DC side of the rectification-inversion unit 121 is connected to the first equalization control unit 130 to realize charging or discharging of the battery cell body. The AC side of the rectification-inversion unit 121 is respectively connected to the first converter 1131 and the DC output unit 1153 circuit to facilitate conversion of the electric energy into a form suitable for transmission. The signal transmission unit 122 can convert the communication signal to facilitate transmission between the first modulation or demodulation unit 140 and the first wireless transmission device 110.

[0078] In some embodiments, the battery cell unit 10 further comprises a sampling monitoring unit 150 configured to detect state information of the battery cell body and a battery control chip 160 connected to the sampling monitoring unit 150, the first equalization control unit 130 and the first modulation or demodulation unit 140.

[0079] The state information can include voltage and / or current of the battery cell body, etc. The battery control chip 160 can send the state information received from the sampling monitoring unit 150 to the first modulation or demodulation unit 140, so as to send the state information in the form of wireless communication. In addition, the sampling monitoring unit 150 can further comprise a protection circuit to realize overvoltage protection or overcurrent protection of the battery cell body, etc.

[0080] The battery control chip 160 can control the first equalization control unit 130 to realize equalization. For example, the battery control chip 160 can control the switching elements in the first equalization control unit 130 to be turned off or turned on, so as to realize start-stop of equalization. The battery control chip 160 can also receive information from the first wireless transmission device 110 received by the first modulation or demodulation unit 140, and perform corresponding control (including equalization control) according to the signal.

[0081] One embodiment of the present application also provides an energy storage system comprising a plurality of battery cell units 10 according to the foregoing, and the battery cell units 10 are connected in series. The energy and signal can be transmitted simultaneously between the battery cell units 10 through wireless transmission. The specific structure and principle of the battery cell unit 10 can refer to the foregoing embodiments, which will not be repeated here.

[0082] In some embodiments, the energy storage system further comprises a master control unit 20 coupled to the first wireless transmission device 110 in each battery cell unit 10 to transmit energy signals and communication signals.

[0083] In the present embodiment, the master control unit 20 serves as the central control of the energy storage system, which can be a PACK controller. The master control unit 20 communicates and transmits energy with each battery cell unit 10, so as to coordinate the operation of the energy storage system and ensure the operation of the energy storage system. The related units of the master control unit 20 for realizing communication and simultaneous energy transmission can adopt the same structure as each structure in the battery cell unit 10.

[0084] Referring to Figure 4 , Figure 4 An architecture of the energy storage system is shown. In some embodiments, the master control unit 20 includes a second wireless transmission device 210, a second transceiver unit 220, a second equalization control unit 230, a second modulation or demodulation unit 240, and a master control chip 250, the second wireless transmission device 210 is coupled with the first wireless transmission device 110 in each cell unit 10; the second transceiver unit 220 is connected with the second wireless transmission device 210; the second equalization control unit 230 and the second modulation or demodulation unit 240 are both connected with the second transceiver unit 220; the master control chip 250 is connected with the second transceiver unit 220, the second equalization control unit 230 and the second modulation or demodulation unit 240 respectively.

[0085] In the present embodiment, the second wireless transmission device 210 can adopt the same structure as the first wireless transmission device 110, the second transceiver unit 220 can adopt the same structure as the first transceiver unit 120, the second equalization control unit 230 can adopt the same structure as the first equalization control unit 130, and the second modulation or demodulation unit 240 can adopt the same structure as the first modulation or demodulation unit 140. The specific structure and principle of each unit in the cell unit 10 can refer to the foregoing embodiments, which will not be repeated here.

[0086] The master control chip 20 can adjust the equalization between each cell unit 10 according to the power information fed back by each cell unit. For example, the master control chip 20 can send equalization control information to cell A and cell B, where the power of cell A is greater than the power of cell B. After receiving the equalization control information, cell A outputs power through the first wireless transmission device 110, and the part of the power is transmitted to the first wireless transmission device 110 in cell B to charge cell B.

[0087] Referring to Figure 5 , Figure 5 An equalization control process of the energy storage system is shown. As an example, the cell control chip in each cell unit 10 detects the temperature, pressure, voltage and current, SOC signal and other information of the cell body in real time, modulates the sampling signal through the first modulation or demodulation unit, couples the sampling signal to the wireless transmission device, and sends it to the master control unit 20; the master control unit 20 receives the coupling signal of each cell unit 10, demodulates it through the second modulation or demodulation module 240, and obtains the SOC information of all cell units 10. Compare the SOC of a certain cell unit 10 with the set SOC threshold and the SOC of other cell units; if the SOC of the cell unit 10 is less than the set SOC threshold, or the difference between the SOC of the cell unit 10 and the SOC of other cell units 10 is greater than a given range; the cell control chip in the cell unit 10 enables the equalization control unit to charge the cell body.

[0088] As another example, the master control unit 20 can also enable the equalization control unit to discharge the battery body in a certain battery cell unit 10 when the SOC of the battery cell unit 10 is greater than a set SOC threshold, or the difference between the SOC of the battery cell unit 10 and the SOC of other battery cell units 10 is greater than a given range.

[0089] Referring to Figure 6-Figure 9 , Figure 6-Figure 9 The architectures of the energy storage systems using different media to realize wireless transmission are respectively shown. In some embodiments, the master control unit 20 and each battery cell unit 10 can realize co-channel transmission of energy and signals through electromagnetic resonance coupling, visible light, ultrasonic waves or radio frequency. Of course, each battery cell unit 10 can also directly realize co-channel transmission of energy and signals. The specific ways based on electromagnetic resonance coupling, visible light, ultrasonic waves or radio frequency can refer to the foregoing, and the present embodiment will not be repeated here.

[0090] The master control unit 20 can also include a storage unit 260, which can be used to store relevant data of each battery cell unit 10, such as voltage and current data or hardware information, etc. The storage unit 260 can also store management strategy information of the energy storage system, which can be set according to requirements, and the present embodiment does not limit this.

[0091] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell unit, characterized in that: include: Battery cell body; a first wireless transmission device configured to couple or decouple an energy signal and a communication signal, and transmit the energy signal and the communication signal based on a wireless transmission medium; a first transceiver unit, connected to the first wireless transmission device and configured to transmit the energy signal and the communication signal; a first balancing control unit, connected to the first transceiver unit and the battery cell body, respectively, and configured to discharge or charge the battery cell body based on the energy signal; The first modulation or demodulation unit is connected to the first transceiver unit and is configured to modulate or demodulate the communication signal.

2. The battery cell unit according to claim 1, characterized in that The first wireless transmission device includes: A wireless transmission medium generating component and a wireless transmission medium receiving component; an energy processing unit, connected to the wireless transmission medium generating component and the first transceiver unit, respectively, and configured to transmit the energy signal through the wireless transmission medium generating component; a communication processing unit, connected to the wireless transmission medium generating component and the first transceiver unit, respectively, and configured to transmit the communication signal through the wireless transmission medium generating component; an energy receiving unit, connected to the wireless transmission medium receiving component and the first transceiver unit, respectively, and configured to receive the energy signal through the wireless transmission medium generating component; The communication receiving unit is connected to the wireless transmission medium receiving component and the first transceiver unit respectively, and is configured to receive the communication signal through the wireless transmission medium generating component.

3. The battery cell unit according to claim 2, characterized in that: The energy processing unit includes a first converter and a first transmitter connected in sequence, the first converter receives the energy signal, and the first transmitter is connected to the wireless transmission medium generating component; The energy receiving unit includes an impedance matching unit, a voltage multiplying unit and a DC output unit connected in sequence. The impedance matching unit is connected to the wireless transmission medium receiving component, and the DC output unit is connected to the first transceiver unit.

4. The battery cell unit according to claim 2, characterized in that: The communication processing unit includes a second converter and a second transmitter connected in sequence, the second converter receives the communication signal, and the second transmitter is connected to the wireless transmission medium generating component; The communication receiving unit includes a receiver and a third converter connected in sequence, the receiver is connected to the wireless transmission medium receiving component, and the third converter is connected to the first transceiver unit.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The first wireless transmission device uses electromagnetic waves, visible light, ultrasonic waves or radio frequency signals to transmit signals.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The first transceiver unit includes: a rectifier and inverter unit, connected to the first balancing control unit and the first wireless transmission device respectively; The signal transmission unit is connected to the first modulation or demodulation unit and the first wireless transmission device respectively.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell unit further includes: A sampling and monitoring unit configured to detect status information of the battery cell body; A cell control chip is connected to the sampling and monitoring unit, the first balancing control unit, and the first modulation or demodulation unit.

8. An energy storage system, characterized in that: The invention comprises a plurality of battery clusters, each of which comprises a plurality of battery core units according to any one of claims 1 to 7, and each of the battery core units in the battery cluster is connected in series.

9. The energy storage system according to claim 8, characterized in that: The energy storage system further includes a main control unit, which is coupled to the first wireless transmission device in each of the battery cells to transmit energy signals and communication signals.

10. The energy storage system according to claim 9, characterized in that: The main control unit includes: a second wireless transmission device coupled to the first wireless transmission device in each of the battery cells; a second transceiver unit connected to the first wireless transmission device; A second equalization control unit and a second modulation or demodulation unit are both connected to the second transceiver unit; The main control chip is connected to the second transceiver unit, the second equalization control unit and the second modulation or demodulation unit respectively.

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