Communication circuit and energy storage battery

Abstract

The invention relates to a communication circuit and an energy storage battery. The communication circuit comprises a photoelectric sending module, a photoelectric receiving module and a light guide module of a tubular structure, the photoelectric sending module and the photoelectric receiving module are arranged at the two ends of the light guide module of the tubular structure respectively, the photoelectric sending module is arranged on a target unit, and the photoelectric receiving module is arranged on another unit except the target unit. The target unit comprises a battery management unit and a battery cluster management unit; and the light guide module is used for transmitting the optical signal output by the photoelectric sending module to the photoelectric receiving module so as to realize communication between the battery management unit and the battery cluster management unit. By adopting the method, the reliability in the communication process can be improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication circuit and an energy storage battery. Background Art

[0002] During the communication between the Battery Management Unit (BMU) and the Battery Cluster Unit (BCU) in the battery management system, electrical isolation is required to protect the user and the battery management system.

[0003] In the related art, during the communication process between the BMU and the BCU, signals are mainly transmitted through a dedicated isolator, Bluetooth or radio frequency transmission protocol to ensure electrical isolation of the communication between the BCU and the BMU.

[0004] However, the isolation strength of dedicated isolators is limited, and the reliability of Bluetooth or device technology during communication is not high. Summary of the invention

[0005] Based on this, it is necessary to provide a communication circuit and energy storage battery to improve the reliability of the communication process in response to the above technical problems.

[0006] In a first aspect, the present application provides a communication circuit, which includes a photoelectric transmitting module, a photoelectric receiving module and a light guide module with a tubular structure, wherein the photoelectric transmitting module and the photoelectric receiving module are respectively arranged at two ends of the light guide module with a tubular structure, the photoelectric transmitting module is arranged on a target unit, and the photoelectric receiving module is arranged on another unit other than the target unit, and the target unit includes a battery management unit and a battery cluster management unit;

[0007] The light guide module is used to transmit the optical signal output by the photoelectric sending module to the photoelectric receiving module to realize the communication between the battery management unit and the battery cluster management unit.

[0008] In one embodiment, the light guide module with a tubular structure includes a light guide unit with a tubular structure and two fixing units, and the two fixing units are respectively arranged at two ends of the light guide unit with a tubular structure;

[0009] A fixing unit is used to seal the light guide unit of the tubular structure.

[0010] In one embodiment, the light guide unit includes a light guide tube, the friction coefficient of the inner wall of the light guide tube is less than a preset friction coefficient, and the length of the light guide tube is determined based on the creepage distance between the battery management unit and the battery cluster management unit.

[0011] In one embodiment, the communication circuit also includes a printed circuit board, the light guide is horizontally arranged on the printed circuit board, a hole is opened on the side where the light guide is attached to the printed circuit board, and the optoelectronic transmitting module and the optoelectronic receiving module are relatively arranged on the printed circuit board corresponding to the position of the hole.

[0012] In one of the embodiments, the optoelectronic sending module includes a light emitting unit and a switch unit, and the switch unit is connected between the target unit and the light emitting unit;

[0013] The switch unit is used to switch on or off the path between the target unit and the light-emitting unit according to the output signal of the target unit.

[0014] In one embodiment, the switch unit includes a switch tube, a pull-up resistor, a driving resistor and a current limiting resistor, and the light-emitting unit includes a light-emitting diode;

[0015] The first end of the pull-up resistor and the emitter of the switch tube are both connected to the power supply, the driving resistor is connected between the base of the switch tube and the target unit, the second end of the pull-up resistor is connected to the base of the switch tube, the current limiting resistor is connected between the collector of the switch tube and the positive electrode of the light-emitting diode, and the negative electrode of the light-emitting diode is grounded.

[0016] In one of the embodiments, the photoelectric receiving module includes a phototransistor, an amplifying unit and a comparing unit, the amplifying unit is connected between the phototransistor and the comparing unit, and the output end of the comparing unit is connected to the target unit;

[0017] Phototransistor, used to convert the received light signal into an electrical signal;

[0018] An amplifying unit, used for amplifying the electrical signal output by the phototransistor;

[0019] The comparison unit is used to compare the amplified electrical signal and output high and low level signals.

[0020] In one of the embodiments, the communication circuit further includes a power module, the power module includes a primary drive unit, an isolation transformer and a secondary rectifier unit, and the isolation transformer is connected between the primary drive unit and the secondary rectifier unit;

[0021] Wherein, the secondary side tap of the isolation transformer in the power module is welded on the printed circuit board.

[0022] In one of the embodiments, the line length of the secondary tap of the isolation transformer is determined based on the creepage distance between the battery management unit and the battery cluster management unit.

[0023] In a second aspect, the present application further provides an energy storage battery, which includes any one of the communication circuits, battery management units and battery cluster management units in the first aspect.

[0024] The above-mentioned communication circuit and energy storage battery, the communication circuit includes a photoelectric sending module, a photoelectric receiving module and a light-guiding module of a tubular structure, the photoelectric sending module and the photoelectric receiving module are respectively arranged at the two ends of the light-guiding module of the tubular structure, the photoelectric sending module is arranged on the target unit, and the photoelectric receiving module is arranged on another unit other than the target unit, and the target unit includes a battery management unit and a battery cluster management unit; the light-guiding module is used to transmit the optical signal output by the photoelectric sending module to the photoelectric receiving module, so as to realize the communication between the battery management unit and the battery cluster management unit. In this circuit, the photoelectric sending module and the photoelectric receiving module can realize the mutual conversion between the photoelectric signals, can convert the electrical signal output by the photoelectric sending module into an optical signal, and transmit it in the light-guiding module of the tubular structure as an optical signal, and then use the photoelectric receiving module to convert the received optical signal into an electrical signal, so as to realize the isolated communication between the battery management unit and the battery cluster management unit, and improve the reliability of the isolated communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic diagram of electrical isolation of a battery management system in one embodiment;

[0027] Figure 2 is a circuit diagram of a communication circuit in one embodiment;

[0028] Figure 3 is a schematic structural diagram of a light guide module in one embodiment;

[0029] Figure 4 is a circuit diagram of a communication circuit in one embodiment;

[0030] Figure 5 is a circuit diagram of a photoelectric sending module in one embodiment;

[0031] Figure 6 is a circuit diagram of a photoelectric receiving module in one embodiment;

[0032] Figure 7 FIG. 4 is a circuit diagram of a communication circuit in one embodiment.

[0033] Description of reference numerals:

[0034] 10: Communication circuit;

[0035] 11: Photoelectric sending module;

[0036] 111: light emitting unit;

[0037] 112: switch unit;

[0038] 12: Photoelectric receiving module;

[0039] 121: amplification unit;

[0040] 122: comparison unit;

[0041] 13: Light guide module;

[0042] 131: light guide unit;

[0043] 1311: light guide tube;

[0044] 132: fixed unit;

[0045] 14: Printed circuit board;

[0046] 15: Power module;

[0047] 151: primary side drive unit;

[0048] 152: Isolation transformer;

[0049] 153: secondary side rectifier unit;

[0050] 20: Battery management unit;

[0051] 30: Battery cluster management unit. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0053] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly defined and specified, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be an electrical connection, a direct connection, or an indirect connection through an intermediate medium, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] Before introducing the technical solution of the present application in detail, a brief introduction to the background technology of the present application is first given.

[0056] The operating voltage in the battery management system of high-voltage energy storage batteries is relatively high. According to relevant standards, the circuits in different power supply domains need to be electrically isolated to protect users and the battery management system. For example, in the battery management system of the commonly used 1500Vdc industrial and commercial energy storage batteries, the communication between the BCU and the BMU needs to be electrically isolated. Assuming that the communication line between the BCU and the BMU is only accessible to maintenance personnel and not to ordinary users, a creepage distance of more than 14.5mm needs to be set. When the energy storage battery is located at a high altitude, a higher creepage distance is required.

[0057] The related technology can achieve isolated communication in two ways. In one way, an optocoupler or digital isolator with high isolation strength and large creepage distance can be used for isolated communication. However, the cost of isolated communication in this way is relatively high. And if the voltage of the battery management system is further increased, the commonly used isolator with a creepage distance of 14.5mm will not be applicable.

[0058] In another way, Bluetooth or radio frequency transmission protocols can be used to achieve isolated communication. However, since Bluetooth or radio frequency transmission protocols are relatively complex, the real-time performance of the communication process is poor and the communication reliability is not high.

[0059] Figure 1 A schematic diagram showing the electrical isolation of a battery management system, wherein a battery cluster includes multiple battery packs and a BCU, each battery pack includes batteries and a BMU, and the BMU includes a circuit directly connected to the battery, an isolation communication device, and a circuit directly connected to the BCU. The first end of the circuit directly connected to the battery is connected to the battery, the isolation communication device is connected between the second end of the circuit directly connected to the battery and the first end of the circuit directly connected to the BCU, and the second end of the circuit directly connected to the BCU is connected to the BCU and BMUs in other battery packs. The BMUs in each battery pack are connected to the BCU via a communication line.

[0060] In view of the above problems, the present application provides a communication circuit and an energy storage battery, which realizes isolated communication between a battery management unit and a battery cluster management unit by transmitting optical signals in a light-guiding module with a tubular structure, thereby improving communication reliability. Of course, the technical solution provided in the embodiments of the present application is not limited to solving the above problems, and there are other technical effects, which can be specifically referred to in the following embodiments. The technical solution of the present application is described in detail below.

[0061] In one embodiment, Figure 2 As shown, a communication circuit 10 is provided, the communication circuit 10 includes a photoelectric sending module 11, a photoelectric receiving module 12 and a light guide module 13 of a tubular structure, the photoelectric sending module 11 and the photoelectric receiving module 12 are respectively arranged at two ends of the light guide module 13 of the tubular structure, the photoelectric sending module 11 is arranged on a target unit, the photoelectric receiving module 12 is arranged on another unit except the target unit, and the target unit includes a battery management unit 20 and a battery cluster management unit 30;

[0062] The light guide module 13 is used to transmit the optical signal output by the photoelectric sending module 11 to the photoelectric receiving module 12 to realize the communication between the battery management unit and the battery cluster management unit.

[0063] In the embodiment of the present application, the communication circuit 10 is used to realize information transmission between the battery management unit and the battery cluster management unit, and electrical isolation needs to be realized during the information transmission process. For example, the battery management unit can transmit information related to battery parameters inside the corresponding battery pack to the battery cluster management unit.

[0064] In order to realize isolated communication between the battery management unit and the battery cluster management unit, the communication circuit 10 is sequentially provided with a photoelectric sending module 11, a tubular light guide module 13 and a photoelectric receiving module 12, and the tubular light guide module 13 is arranged between the photoelectric sending module 11 and the photoelectric receiving module 12.

[0065] The target unit in the communication circuit 10 may be a battery management unit 20 or a battery cluster management unit 30 . When the optoelectronic transmitting module 11 is disposed on the battery management unit 20 , the optoelectronic receiving module 12 is disposed on the battery cluster management unit 30 .

[0066] When the photoelectric transmitting module 11 is disposed on the battery cluster management unit 30 , the photoelectric receiving module 12 is disposed on the battery management unit 20 .

[0067] The photoelectric transmission module 11 is used to convert the electrical signal output by the target unit into an optical signal, and transmit it in the tubular structure of the light guide module 13 in the form of light. For example, when the target unit is the battery management unit 20, the photoelectric transmission module 11 is used to convert the electrical signal output by the battery management unit into an optical signal. When the target unit is the battery cluster management unit 30, the photoelectric transmission module 11 is used to convert the electrical signal output by the battery cluster management unit 30 into an optical signal. In addition, the photoelectric transmission module 11 can be various types of light-emitting devices, for example, the light-emitting device can be a photodiode, a photoconductor, a phototube, a photoresistor, a laser diode, an optical fiber, a photoconductive fiber or an optoelectronic device.

[0068] The light guide module 13 is configured as a tubular structure, through which the optical signal output by the optoelectronic transmission module 11 can be quickly transmitted. In other words, the inner wall of the tubular structure of the light guide module 13 needs to have good light reflection ability. It should be noted that in order to ensure that the optical signal transmission process is not interfered by external signals and the optical signal does not leak out of the tubular structure, the tubular structure of the light guide module 13 can be configured as a closed structure, or fixings can be added at both ends of the tubular structure to achieve the sealing of the light guide module 13.

[0069] When the optical signal is output from one end of the light guide module 13 of the tubular structure and transmitted to the other end of the tubular structure through the tubular structure of the light guide module 13, the photoelectric receiving module 12 arranged at the other end can receive the optical signal and convert the optical signal into an electrical signal, thereby realizing the communication between the battery management unit and the battery cluster management unit. The photoelectric receiving module 12 can be various types of optical receiving devices, for example, the optical receiving device can be a phototransistor Q2. It should be noted that the photoelectric sending module 11 and the photoelectric receiving module 12 are two different devices, and the light guide module is arranged between the two devices to play an isolation role.

[0070] The communication circuit 10 includes a photoelectric transmitting module 11, a photoelectric receiving module 12 and a light guide module 13 of a tubular structure. The photoelectric transmitting module 11 and the photoelectric receiving module 12 are respectively arranged at two ends of the light guide module 13 of the tubular structure. The photoelectric transmitting module 11 is arranged on a target unit, and the photoelectric receiving module 12 is arranged on another unit other than the target unit. The target unit includes a battery management unit 20 and a battery cluster management unit 30. The light guide module 13 is used to transmit the optical signal output by the photoelectric transmitting module 11 to the photoelectric receiving module 12, so as to realize the communication between the battery management unit and the battery cluster management unit. In the circuit, the photoelectric transmitting module 11 and the photoelectric receiving module 12 can realize the mutual conversion between the photoelectric signals, can convert the electrical signal output by the target unit into an optical signal, and transmit it in the light guide module 13 of the tubular structure as an optical signal, and then use the photoelectric receiving module 12 to convert the received optical signal into an electrical signal, so as to realize the isolated communication between the battery management unit and the battery cluster management unit, and improve the reliability of the isolated communication.

[0071] Next, the light guide module 13 in the communication circuit 10 is further described by an embodiment. Figure 3 As shown, the light guide module 13 with a tubular structure includes a light guide unit 131 with a tubular structure and two fixing units 132, and the two fixing units 132 are respectively arranged at two ends of the light guide unit 131 with a tubular structure;

[0072] The fixing unit 132 is used to seal the light guiding unit 131 of the tubular structure.

[0073] When the optical signal is transmitted in the tubular structure, other signals may interfere with the optical signal, or the optical signal may leak out of the tubular structure, resulting in inaccurate communication. To avoid these two problems, an integrated closed tubular structure may be provided. However, the closed tubular structure cannot flexibly adjust the length of the tubular structure. Therefore, two fixing units 132 may be provided at the two ports of the tubular structure. Figure 3 The structure shown, Figure 3 The upper part is the main view, and the lower part is the three-dimensional view. The tubular structure in the figure is a square tube or a circular tube.

[0074] The fixing unit 132 may be made of metal material. In order to improve the reflectivity of the optical signal, the inner wall of the fixing unit 132 needs to be sufficiently smooth.

[0075] In one embodiment, the light guide unit 131 includes a light guide tube 1311 , the inner wall friction coefficient of the light guide tube 1311 is less than a preset friction coefficient, and the length of the light guide tube 1311 is determined based on the creepage distance between the battery management unit and the battery cluster management unit.

[0076] In the embodiment of the present application, the light guide 1311 may be made of an insulating material, for example, the insulating material may be a plastic material, an acrylic material, etc.

[0077] In order to facilitate the transmission of optical signals in the inner wall of the light guide 1311, it is necessary to improve the reflection capability of the light in the inner wall of the light guide 1311. Therefore, the inner wall of the light guide 1311 can be set to be sufficiently smooth, that is, the friction coefficient of the inner wall of the light guide 1311 is less than the preset friction coefficient. The preset friction coefficient can be obtained based on historical experience.

[0078] The length of the light guide 1311 between the two fixing units 132 is the creepage distance. The length of the light guide 1311 can be flexibly adjusted according to the requirements of the creepage distance to achieve strong communication isolation.

[0079] After the fixing unit 132 and the light guide 1311 are assembled, the optical signal can only be transmitted inside the light guide 1311 and will not leak to the outside of the light guide 1311, and no external light will enter the light guide 1311, that is, the light guide 1311 can shield light and avoid mutual interference between different optical signals.

[0080] The above-mentioned light guide module 13 of tubular structure includes a light guide unit 131 of tubular structure and two fixing units 132, and the two fixing units 132 are respectively arranged at the two ends of the light guide unit 131 of tubular structure; the fixing unit 132 is used to seal the light guide unit 131 of tubular structure. Among them, the light guide unit 131 includes a light guide tube 1311, the inner wall friction coefficient of the light guide tube 1311 is less than the preset friction coefficient, and the length of the light guide tube 1311 is determined based on the creepage distance between the battery management unit and the battery cluster management unit. By setting the fixing units 132 at both ends of the light guide unit 131, on the one hand, it can form a closed space with the light guide unit 131 to avoid the influence of other signals on the transmission process of the optical signal, and it can also avoid the optical signal from being exposed to the outside of the light guide unit 131 during the transmission process, so as to ensure the complete transmission of the optical signal. On the other hand, by setting the fixing parts, the length of the light guide tube 1311 can be flexibly adjusted to meet the creepage distance in different scenarios.

[0081] In one embodiment, Figure 4 As shown, the communication circuit 10 also includes a printed circuit board 14, a light guide tube 1311 is horizontally arranged on the printed circuit board 14, a hole is opened on the side where the light guide unit 131 is attached to the printed circuit board 14, and the photoelectric sending module 11 and the photoelectric receiving module 12 are relatively arranged on the printed circuit board 14 corresponding to the opening position.

[0082] After the fixing unit 132 and the light guide 1311 are assembled, in order to facilitate the installation of the optoelectronic transmitting module 11 and the optoelectronic receiving module 12, a hole needs to be opened on the side where the light guide 1311 is attached to the printed circuit board 14. The shape of the hole can be rectangular, oval, etc. The embodiment of the present application does not limit the shape of the hole.

[0083] Taking the opening shape as the long direction as an example, the photoelectric transmitting module 11 and the photoelectric receiving module 12 are arranged at both ends of the printed circuit board 14 corresponding to the rectangle. In this way, after the photoelectric transmitting module 11 and the photoelectric receiving module 12 are arranged, the light guide 1311 can be buckled on the printed circuit board 14 in the shape of a cover, and the printed circuit board 14, the fixing unit 132 and the light guide 1311 form a closed space, which is convenient for the transmission of optical signals in the closed space.

[0084] It should be noted that the fixing unit 132 may be a fixing member, and the fixing member may be directly welded on the printed circuit board 14. For example, the printed circuit board 14 may be a single-sided board, a double-sided board, a multi-layer board, or a high-density interconnect board.

[0085] The communication circuit 10 further comprises a printed circuit board 14, a light guide 1311 is horizontally arranged on the printed circuit board 14, a hole is opened on the side where the light guide unit 131 is attached to the printed circuit board 14, and the photoelectric transmitting module 11 and the photoelectric receiving module 12 are relatively arranged on the printed circuit board 14 corresponding to the position of the hole. By opening a hole in the light guide 1311, it is convenient to relatively arrange the photoelectric transmitting module 11 and the photoelectric receiving module 12 on the printed circuit board 14 corresponding to the position of the hole, so that the light guide 1311, the two fixing units 132 and the printed circuit board 14 can form a closed space, and the photoelectric transmitting module 11 and the photoelectric receiving module 12 are enclosed in the closed space, which can facilitate the complete transmission of the optical signal and avoid the interference of other optical signals.

[0086] Next, the specific contents of the photoelectric transmitting module 11 and the photoelectric receiving module 12 are respectively described.

[0087] First, the specific contents of the optoelectronic sending module 11 are described. In one embodiment, Figure 5 As shown, the photoelectric sending module 11 includes a light emitting unit 111 and a switch unit 112, and the switch unit 112 is connected between the target unit and the light emitting unit 111;

[0088] The switch unit 112 is used to switch on or off the path between the target unit and the light-emitting unit 111 according to the output signal of the target unit.

[0089] In the embodiment of the present application, the switch unit 112 is arranged between the target unit and the light emitting unit 111. If the target unit is the battery management unit 20, and the battery management unit 20 communicates with the battery cluster management unit 30, the battery management unit 20 outputs a low-level signal, the switch unit 112 is in a conducting state, and the path between the battery management unit 20 and the light emitting unit 111 is turned on, and the light emitting unit 111 starts to emit light, thereby realizing the conversion of the electrical signal into an optical signal.

[0090] When the battery management unit 20 and the battery cluster management unit 30 do not need to communicate, the battery management unit 20 outputs a high level signal, the switch unit 112 is in an off state, and the path between the battery management unit 20 and the light-emitting unit 111 is cut off, and the light-emitting unit 111 does not work. The switch unit 112 can be a metal oxide semiconductor field effect transistor (MOS tube) or a triode.

[0091] In one embodiment, the switch unit 112 includes a switch tube Q1, a pull-up resistor R1, a driving resistor R2 and a current limiting resistor R3, and the light emitting unit 111 includes a light emitting diode LED;

[0092] The first end of the pull-up resistor R1 and the emitter of the switch tube Q1 are connected to the power supply VCC, the driving resistor R2 is connected between the base of the switch tube Q1 and the target unit, the second end of the pull-up resistor R1 is connected to the base of the switch tube Q1, the current limiting resistor R3 is connected between the collector of the switch tube Q1 and the positive electrode of the light-emitting diode LED, and the negative electrode of the light-emitting diode LED is grounded.

[0093] The power supply VCC can be the same as the high level voltage output by the target unit. When the target unit outputs a high level, the switch tube Q1 is turned off and the light emitting diode LED does not work. When the target unit outputs a low level, the switch tube Q1 is turned on and the light emitting diode LED works.

[0094] The above-mentioned photoelectric sending module 11 includes a light-emitting unit 111 and a switch unit 112, and the switch unit 112 is connected between the target unit and the light-emitting unit 111; the switch unit 112 is used to turn on or off the path between the target unit and the light-emitting unit 111 according to the output signal of the target unit. Among them, the switch unit 112 includes a switch tube Q1, a pull-up resistor R1, a driving resistor R2 and a current limiting resistor R3, and the light-emitting unit 111 includes a light-emitting diode LED; the first end of the pull-up resistor R1 and the emitter of the switch tube Q1 are connected to the power supply VCC, the driving resistor R2 is connected between the base of the switch tube Q1 and the target unit, the second end of the pull-up resistor R1 is connected to the base of the switch tube Q1, the current limiting resistor R3 is connected between the collector of the switch tube Q1 and the positive electrode of the light-emitting diode LED, and the negative electrode of the light-emitting diode LED is grounded. A light emitting diode LED is used as the light emitting unit 111, and a switch tube Q1 is set between the battery management unit 20 and the light emitting unit 111. The light emitting diode LED is controlled by turning on and off the switch tube Q1 to ensure signal transmission between the battery management unit 20 and the battery cluster management unit 30.

[0095] Next, the contents of the optoelectronic receiving module 12 are described. In one embodiment, Figure 6 As shown, the photoelectric receiving module 12 includes a phototransistor Q2, an amplifying unit 121 and a comparing unit 122, the amplifying unit is connected between the phototransistor Q2 and the comparing unit 122, and the output end of the comparing unit 122 is connected to the target unit;

[0096] Phototransistor Q2, used to convert the received optical signal into an electrical signal;

[0097] The amplifying unit 121 is used to amplify the electrical signal output by the phototransistor Q2;

[0098] The comparison unit 122 is used to compare the amplified electrical signal and output high and low level signals.

[0099] In an embodiment of the present application, the phototransistor Q2 can be arranged at one end of the printed circuit board 14 corresponding to the opening position. When the light-emitting diode LED emits light, the phototransistor Q2 outputs a weak electrical signal and transmits the weak electrical signal to the amplifier circuit. The amplifier circuit can amplify and buffer the weak electrical signal, and input the amplified and buffered electrical signal into the comparison unit 122. The comparison unit 122 can compare the electrical signal with the preset electrical signal and output a low-level signal. When the light-emitting diode LED does not emit light, the comparison unit 122 outputs a high-level signal. For example, the amplifier unit 121 can be composed of an operational amplifier and other electronic components; the comparison unit 122 can be composed of a comparator and other electronic components.

[0100] The above-mentioned photoelectric receiving module 12 includes a phototransistor Q2, an amplifying unit 121 and a comparing unit 122. The amplifying unit is connected between the phototransistor Q2 and the comparing unit 122, and the output end of the comparing unit 122 is connected to the target unit. The phototransistor Q2 is used to convert the received optical signal into an electrical signal. The amplifying unit 121 is used to amplify the electrical signal output by the phototransistor Q2. The comparing unit 122 is used to compare the amplified electrical signal and output a high and low level signal. The received optical signal can be converted into an electrical signal by the phototransistor Q2, and the output of the electrical signal is realized through the amplification of the amplifying unit 121 and the comparison processing of the comparing unit 122, thereby realizing the communication between the battery management unit 20 and the battery cluster management unit 30.

[0101] In the above embodiment, the battery management unit 20 and the battery cluster management unit 30 are electrically isolated from each other through a communication circuit 10. During operation, the communication circuit 10 also needs the power module 15 to provide power, and also needs to achieve electrical isolation between the power provided by the power module 15 and the power output by the battery. Figure 7 As shown, the communication circuit 10 further includes a power module 15, the power module 15 includes a primary drive unit 151, an isolation transformer 152 and a secondary rectifier unit 153, and the isolation transformer 152 is connected between the primary drive unit 151 and the secondary rectifier unit 153;

[0102] The secondary tap of the isolation transformer 152 in the power module 15 is welded on the printed circuit board 14 .

[0103] In an embodiment of the present application, the first end of the primary drive unit 151 is connected to the voltage source, the first end of the secondary rectifier unit 153 is connected to the communication circuit 10, and the isolation transformer 152 is connected between the second end of the primary drive unit 151 and the second end of the secondary rectifier unit 153.

[0104] It should be noted that the secondary side of the isolation transformer 152 uses three-layer insulated wires, and the taps of the secondary side do not need to be welded on the welding angle of the transformer frame, but are suspended and overlapped and welded on the printed circuit board 14.

[0105] In one embodiment, the line length of the secondary tap of the isolation transformer 152 is determined based on the creepage distance between the battery management unit 20 and the battery cluster management unit 30 .

[0106] By controlling the line length of the secondary tap of the isolation transformer 152, the creepage distance of the transformer can be adjusted, thereby satisfying the electrical isolation between the electric energy provided by the power module 15 and the electric energy output by the battery.

[0107] The communication circuit 10 further includes a power module 15, which includes a primary drive unit 151, an isolation transformer 152 and a secondary rectifier unit 153. The isolation transformer 152 is connected between the primary drive unit 151 and the secondary rectifier unit 153; wherein the secondary tap of the isolation transformer 152 in the power module 15 is welded on the printed circuit board 14. The wire length of the secondary tap of the isolation transformer 152 is determined based on the creepage distance between the battery management unit 20 and the battery cluster management unit 30. By welding the secondary tap of the isolation transformer 152 on the printed circuit board 14, the wire length of the secondary tap of the isolation transformer 152 can be flexibly adjusted based on the creepage distance, so as to achieve electrical isolation between the electric energy provided by the power module 15 and the electric energy output by the battery.

[0108] In one embodiment, an energy storage battery is provided, which includes the communication circuit 10, the battery management unit 20 and the battery cluster management unit 30 in any one of the above embodiments. The communication circuit 10 can realize electrical isolation communication between the battery management unit 20 and the battery cluster management unit 30.

[0109] The above content is a further detailed description of the embodiments of the present application in combination with specific / preferred implementation methods, and it cannot be determined that the specific implementation of the embodiments of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the embodiments of the present application belong, without departing from the concept of the embodiments of the present application, it can also make several substitutions or modifications to these described implementation methods, and these substitutions or modifications should be regarded as belonging to the protection scope of the embodiments of the present application. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily target 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. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered as the scope recorded in this specification.

[0110] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0111] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A communication circuit, characterized in that: The communication circuit includes a photoelectric sending module, a photoelectric receiving module and a light guide module of a tubular structure, wherein the photoelectric sending module and the photoelectric receiving module are respectively arranged at two ends of the light guide module of the tubular structure, the photoelectric sending module is arranged on a target unit, and the photoelectric receiving module is arranged on another unit except the target unit, and the target unit includes a battery management unit and a battery cluster management unit; The light guide module is used to transmit the optical signal output by the photoelectric sending module to the photoelectric receiving module, so as to realize the communication between the battery management unit and the battery cluster management unit.

2. The circuit according to claim 1, characterized in that The tubular light guide module comprises a tubular light guide unit and two fixing units, wherein the two fixing units are respectively arranged at two ends of the tubular light guide unit; The fixing unit is used to seal the light guiding unit of the tubular structure.

3. The circuit according to claim 2, characterized in that The light guide unit includes a light guide tube, the friction coefficient of the inner wall of the light guide tube is less than a preset friction coefficient, and the length of the light guide tube is determined based on the creepage distance between the battery management unit and the battery cluster management unit.

4. The circuit according to claim 3, characterized in that The communication circuit also includes a printed circuit board, the light guide is horizontally arranged on the printed circuit board, a hole is opened on one side of the light guide that is in contact with the printed circuit board, and the photoelectric transmitting module and the photoelectric receiving module are relatively arranged on the printed circuit board corresponding to the opening position.

5. The circuit according to any one of claims 1 to 4, characterized in that: The photoelectric sending module includes a light emitting unit and a switch unit, and the switch unit is connected between the target unit and the light emitting unit; The switch unit is used to switch on or off the path between the target unit and the light-emitting unit according to the output signal of the target unit.

6. The circuit according to claim 5, characterized in that The switch unit includes a switch tube, a pull-up resistor, a driving resistor and a current limiting resistor, and the light-emitting unit includes a light-emitting diode; The first end of the pull-up resistor and the emitter of the switch tube are both connected to the power supply, the driving resistor is connected between the base of the switch tube and the target unit, the second end of the pull-up resistor is connected to the base of the switch tube, the current limiting resistor is connected between the collector of the switch tube and the positive electrode of the light-emitting diode, and the negative electrode of the light-emitting diode is grounded.

7. The circuit according to any one of claims 1 to 4, characterized in that: The photoelectric receiving module comprises a phototransistor, an amplifying unit and a comparing unit, wherein the amplifying unit is connected between the phototransistor and the comparing unit, and an output end of the comparing unit is connected to the target unit; The phototransistor is used to convert the received optical signal into an electrical signal; The amplifying unit is used to amplify the electrical signal output by the phototransistor; The comparison unit is used to compare the amplified electrical signals and output high and low level signals.

8. The circuit according to any one of claims 1 to 4, characterized in that: The communication circuit further includes a power module, the power module includes a primary drive unit, an isolation transformer and a secondary rectifier unit, and the isolation transformer is connected between the primary drive unit and the secondary rectifier unit; Wherein, the secondary side tap of the isolation transformer in the power module is welded on the printed circuit board.

9. The circuit according to claim 8, characterized in that The line length of the secondary tap of the isolation transformer is determined based on the creepage distance between the battery management unit and the battery cluster management unit.

10. An energy storage battery, characterized in that: The energy storage battery comprises the communication circuit, battery management unit and battery cluster management unit as described in any one of claims 1 to 9.

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