Battery pack and energy storage system

Abstract

The utility model discloses a battery pack and an energy storage system, the battery pack comprises battery modules, analog acquisition front ends and common mode inductors, the analog acquisition front ends are at least connected with one battery module so as to acquire operation information of the connected battery modules, and the common mode inductors are arranged between any two connected analog acquisition front ends. The analog acquisition front ends are arranged to acquire and monitor the operation information of the connected battery modules, and the common-mode inductors are arranged between any two connected analog acquisition front ends, so that common-mode interference signals are reduced to the minimum extent, propagation of the common-mode interference signals is effectively isolated and reduced, and the reliability of the battery modules is improved. And the anti-interference capability of daisy chain communication is improved, and the stability of daisy chain communication is ensured, so that the anti-interference capability and the stability of the battery pack are improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and more specifically, to a battery pack and an energy storage system. Background Art

[0002] At present, the communication method generally used in energy storage systems is daisy chain communication. Daisy chain communication can improve the flexibility of energy storage systems and reduce the communication costs of energy storage systems. Therefore, daisy chain communication is widely used in energy storage systems.

[0003] However, the anti-interference capability of daisy chain communication is relatively weak. When the daisy chain communication is interfered with, it may cause communication data loss, invalid data, etc., thereby affecting the normal operation of the energy storage system. Therefore, it is necessary to enhance the anti-interference capability of daisy chain communication in the energy storage system. Summary of the invention

[0004] An embodiment of the present application provides a battery pack and an energy storage system. The battery pack includes a battery module, an analog acquisition front end and a common-mode inductor. A common-mode inductor is set between any two connected analog acquisition front ends to reduce and isolate the propagation of common-mode interference signals, improve the anti-interference capability of daisy chain communication and ensure the stability of daisy chain communication, thereby increasing the anti-interference capability and stability of the battery pack.

[0005] The battery pack of the embodiment of the present application includes a battery module, an analog acquisition front end and a common-mode inductor. The analog acquisition front end is connected to at least one of the battery modules to collect operating information of the connected battery module. The common-mode inductor is arranged between any two connected analog acquisition front ends.

[0006] In some embodiments, the battery pack further includes a charge and discharge converter and a first magnetic ring, the battery pack is charged and discharged through the charge and discharge converter, the charge and discharge converter and the plurality of battery modules are connected in series, and the first magnetic ring is provided on the circuit between the charge and discharge converter and adjacent battery modules.

[0007] In some embodiments, the battery pack further includes a switch box, two ends of which are respectively connected to the battery cluster and the charge and discharge converter, the switch box is configured to control the conduction and disconnection of the circuit between the battery module and the charge and discharge converter, and the first magnetic ring is disposed in the switch box.

[0008] In certain embodiments, the charge-discharge converter includes a power board, a filter circuit and a power line. The filter circuit is disposed on the power board, and the first magnetic ring is disposed on the power line.

[0009] In certain embodiments, the battery pack includes a first controller, and the first controller is configured to filter signals received and sent by the first controller based on a preset filtering algorithm when the battery pack is being charged or discharged.

[0010] The energy storage system of the embodiment of the present application includes the battery pack described in any of the above embodiments.

[0011] In some embodiments, the energy storage system includes a plurality of battery clusters, a charge and discharge converter and a second magnetic ring, the battery cluster includes a plurality of battery packs connected in series, the battery cluster is charged and discharged through the charge and discharge converter, and the second magnetic ring is arranged on the line between the battery cluster and the charge and discharge converter.

[0012] In certain embodiments, the circuit between the battery cluster and the charge-discharge converter includes a positive circuit and a negative circuit, and both the positive circuit and the negative circuit are provided with the second magnetic ring.

[0013] In some embodiments, the energy storage system further includes a switch box, two ends of which are respectively connected to the battery cluster and the charge and discharge converter, the switch box is configured to control the conduction and disconnection of the line between the battery cluster and the charge and discharge converter, and the second magnetic ring is disposed in the switch box.

[0014] In some embodiments, the second magnetic ring is provided on the line between any two connected battery packs.

[0015] In some embodiments, the energy storage system also includes a second controller, each of the battery clusters is provided with a corresponding second controller, each of the battery packs is provided with a corresponding first controller, the second controller corresponding to the target battery cluster and the first controllers of each of the battery packs in the target battery cluster are connected in series, and the target battery cluster is any of the battery clusters.

[0016] In certain embodiments, the first controller and / or the second controller is configured to, in the event of data abnormality at any node, read data of the abnormal node from a first direction or a second direction on a ring line where the node is located, respectively, wherein the node includes at least one of the first controller, the second controller, the battery module, and the analog acquisition front end, and the first direction is opposite to the second direction.

[0017] In some embodiments, the first controller and / or the second controller is configured to determine that the target node data is abnormal when no data of the target node is received within a preset time period and / or the data of the target node is outside a preset numerical range, and the target node is any of the nodes.

[0018] In certain embodiments, each line of the energy storage system is a shielded twisted pair line, and the resistance of the line is greater than 100 ohms.

[0019] The battery pack and energy storage system of the implementation mode of the present application, the battery pack includes a battery module, an analog acquisition front end and a common-mode inductor. The analog acquisition front end is connected to at least one battery module to collect and monitor the operating information of the connected battery module to achieve status evaluation and control of the battery module; a common-mode inductor is arranged between any two connected analog acquisition front ends, so that the common-mode interference signal can be reduced to a minimum, effectively isolating and reducing the propagation of the common-mode interference signal, improving the anti-interference capability of the daisy chain communication and ensuring the stability of the daisy chain communication, thereby increasing the anti-interference capability and stability of the battery pack.

[0020] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a schematic diagram of an application scenario of a defect detection method in some embodiments of the present application;

[0023] Figure 2 is a schematic diagram of a scene of a defect detection method in some embodiments of the present application;

[0024] Figure 3 It is a scenario diagram of a defect detection method in certain embodiments of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three, unless otherwise clearly and specifically defined.

[0028] To facilitate understanding of this application, the terms and components appearing in this application are explained below:

[0029] 1. Battery Management System (BMS): refers to a system that manages and protects batteries to extend battery life. It usually has the function of measuring battery voltage to prevent or avoid abnormal conditions such as over-discharge, over-charge, and over-temperature.

[0030] 2. Battery Management Unit (BMU): It can collect and monitor the voltage and temperature of the battery, and upload the data to the central management unit (CMU) of the energy storage system, so that the CMU can monitor, control and manage the entire energy storage system.

[0031] 3. Active Front End (AFE): Also known as the analog front-end circuit, it is used to monitor important parameters such as battery voltage, current and temperature in real time, and transmit these parameters to the BMU.

[0032] 4. Common-mode interference: In the same circuit, when multiple signal lines or power lines share a common ground or power supply, it is easy to generate a common-mode voltage relative to the ground (or power supply). The common-mode voltage will be mistaken for a signal voltage and enter the receiving end, thereby affecting the signal transmission speed and accuracy.

[0033] 5. Power Conversion System (PCS): refers to the system that can convert DC power in the energy storage system into AC power, and convert AC power from the power grid or other power sources into DC power to meet the charging and discharging needs of the energy storage system.

[0034] 6. Common mode Choke: Also called common mode choke, common mode inductor can generate a reverse signal that matches the frequency of the common mode interference signal through self-inductance and mutual inductance when the common mode interference signal enters the common mode inductor, thereby offsetting or reducing the amplitude of the common mode interference signal.

[0035] 7. Filter ring: The filter ring can be used to suppress the interference of common-mode signals and improve the anti-interference ability of signals. The filter ring is particularly important in lines with strong high-frequency noise, such as power lines, signal lines, and sensor lines. When the signal passes through the filter ring, electromagnetic induction will occur, so that the high-frequency signal is blocked and attenuated, thereby reducing the degree of interference and improving the reliability and stability of the circuit. In the embodiment of the present application, the first filter ring and the second filter ring are both filter rings that can suppress common-mode signal interference.

[0036] Lithium-ion energy storage system refers to an energy storage system that uses lithium-ion batteries as energy storage media to store electrical energy for subsequent use.

[0037] The lithium-ion energy storage system is divided into a DC side and an AC side. Generally, the battery is managed and protected through a BMS to extend the battery life. The DC side of the lithium-ion energy storage system generally includes multiple energy storage battery clusters. An energy storage battery cluster consists of several battery packs. In each battery pack, the BMU collects and monitors the voltage and temperature of the battery cell, and uploads the sampled data to the CMU.

[0038] Daisy chain communication is a communication method used to connect energy storage devices. At present, the communication method in energy storage systems is generally daisy chain communication. The energy storage system processes and coordinates the work between the various components of the energy storage system through daisy chain communication. Since daisy chain communication only has two wires and supports connecting multiple energy storage device nodes, it can reduce communication costs and improve system flexibility. Therefore, daisy chain communication is widely used in energy storage systems.

[0039] The charging function of the energy storage system refers to the conversion of 220V AC high voltage electricity from an external power source or power grid into DC high voltage electricity suitable for the battery pack voltage and battery pack current of the energy storage system through a charger and discharger, and charging the battery pack through the DC high voltage electricity to realize the charging of the energy storage system; the discharging function of the energy storage system refers to the conversion of the DC high voltage electricity stored in the battery pack into 220V AC high voltage electricity and discharge it through a charger and discharger to realize the discharge of the energy storage system. Since the charger and discharger is a switching device, when the charger and discharger is turned on and off, changes in current and voltage will cause changes in the electromagnetic field, thereby generating electromagnetic radiation, and the radiated electromagnetic waves will cause electromagnetic interference and common mode interference. Electromagnetic interference can be transmitted to each module in the battery pack through the total positive power line and the total negative power line. Since the voltage reference ground of each AFE in the battery pack is the negative pole of the corresponding module, that is, the daisy chain communication of each AFE refers to the ground of the corresponding module, then when the negative pole of the corresponding module fluctuates due to the conducted electromagnetic interference, the daisy chain communication will be affected by common-mode interference, and the measurement accuracy and communication quality of the AFE will also be affected, thereby affecting the normal use of the energy storage system.

[0040] In order to solve the above technical problems, an embodiment of the present application provides a battery pack.

[0041] The following first introduces the application scenarios of the technical solution of this application. Figure 1 As shown, it is a schematic diagram of an application scenario of an embodiment of a battery pack provided in an embodiment of the present application. The application scenario involves a battery pack 100, and the battery pack 100 includes a battery module, an analog acquisition front end (i.e., AFE) and a common-mode inductor. The analog acquisition front end is connected to at least one battery module, and a common-mode inductor is arranged between any two connected analog acquisition front ends.

[0042] Figure 1 It is exemplarily shown that a battery pack 100 includes a battery module 11, a battery module 12 and a battery module 13, the analog acquisition front end includes AFE21, AFE22 and AFE23, the common mode inductor includes common mode inductor 31, common mode inductor 32 and common mode inductor 33, a total of 3 battery modules, 3 analog acquisition front ends and 3 common mode inductors. In fact, the battery pack 100 includes other numbers of battery modules, analog acquisition front ends and common mode inductors, and the embodiments of the present application are not limited to this.

[0043] In some implementations, the energy storage system further includes a charge-discharge converter 40 , which may be a PCS 40 or a charge-discharge machine 40 .

[0044] In some implementations, each battery pack 100 and each battery module within a battery pack 100 communicates via a daisy chain.

[0045] The battery pack of this application will be described in detail below:

[0046] See also Figure 1 An embodiment of the present application provides a battery pack, which includes: a battery module, an analog acquisition front end and a common-mode inductor. The analog acquisition front end is connected to at least one battery module to collect operating information of the connected battery module, and a common-mode inductor is arranged between any two connected analog acquisition front ends.

[0047] Among them, the battery pack 100 may refer to a battery system for storing and releasing energy; the battery module may be a battery module composed of multiple battery cells connected in series or in parallel, and the battery cells may be lithium-ion batteries, lead-acid batteries, nickel-metal hydride batteries, etc.

[0048] Specifically, the battery pack 100 includes a battery module, an analog acquisition front end, and a common mode inductor. The battery module in the battery pack 100 includes at least one. The analog acquisition front end is connected to at least one battery module to collect and monitor the operating information of the connected battery module. The operating information may include operating status and operating parameter information (such as voltage, current, temperature and other parameter information). The analog acquisition front end can convert the collected operating information of the battery module into digital information, and analyze and process it to achieve status evaluation and control of the battery module.

[0049] The communication mode between the battery modules of the battery pack 100 and between the analog acquisition front end and the battery modules is daisy chain communication, and a common mode inductor is provided between any two connected analog acquisition front ends. When the common mode interference signal passes through the common mode inductor, since the current directions of the common mode interference signal and the common mode inductor are opposite, the magnetic fields they generate will cancel each other out, so that the common mode interference signal can be reduced to a minimum, thereby effectively isolating and reducing the propagation of the common mode interference signal, thereby improving the anti-interference ability of the daisy chain communication and ensuring the stability of the daisy chain communication, and increasing the anti-interference ability and stability of the battery pack.

[0050] It is understandable that any two analog acquisition front ends can be directly connected, such as directly connected through physical connections such as wires or cables; or indirectly connected, such as connecting two analog acquisition front ends through battery modules, transformers, etc.

[0051] In this way, the battery pack 100 includes a battery module, an analog acquisition front end and a common-mode inductor. The analog acquisition front end is connected to at least one battery module to collect and monitor the operating information of the connected battery module to achieve status evaluation and control of the battery module; a common-mode inductor is arranged between any two connected analog acquisition front ends, so that the common-mode interference signal can be reduced to a minimum, effectively isolating and reducing the propagation of the common-mode interference signal, improving the anti-interference capability of the daisy chain communication and ensuring the stability of the daisy chain communication, thereby increasing the anti-interference capability and stability of the battery pack.

[0052] Please continue reading Figure 1 In some embodiments, the battery pack further includes a charge and discharge converter and a first magnetic ring. The battery pack is charged and discharged through the charge and discharge converter. The charge and discharge converter and a plurality of battery modules are connected in series. A first magnetic ring is provided on the circuit between the charge and discharge converter and adjacent battery modules.

[0053] The charge-discharge converter 40 may be a power conversion system (PCS) or the like that can control the charging and discharging process and switch between alternating current (AC) and direct current (DC).

[0054] Specifically, the battery pack 100 may also include a charge-discharge converter 40 and a first magnetic ring (not shown in the figure). The battery pack 100 is charged and discharged through the charge-discharge converter 40. In the case of charging, the energy is absorbed and stored; or in the case of discharging, the stored energy is supplied to an external circuit or device. The charge-discharge converter 40 and a plurality of battery modules are connected in series. A first magnetic ring is provided on the line between the charge-discharge converter 40 and the adjacent battery modules. The first magnetic ring can guide and concentrate the interference magnetic field. That is, by providing the first magnetic ring, the common-mode interference of the magnetic field generated by the current on the line between the charge-discharge converter 40 and the adjacent battery modules to the surrounding communication environment can be reduced, thereby improving the working stability of the battery pack.

[0055] Optionally, the battery pack further includes a switch box, two ends of which are respectively connected to the battery pack and the charge and discharge converter, the switch box is configured to control the conduction and disconnection of the circuit between the battery module and the charge and discharge converter, and the first magnetic ring is disposed in the switch box.

[0056] Specifically, the battery pack 100 may also include a switch box 50, the two ends of the switch box 50 are respectively connected to the battery pack 100 and the charge-discharge converter 40, and the switch box 50 is configured to control the conduction and disconnection of the line between the battery module and the charge-discharge converter 40, that is, the connection and disconnection between the battery pack 100 and the charge-discharge converter 40 are controlled by the switch box 50 to achieve control of the charge and discharge process of the battery pack 100. For example, the switch box 50 controls the conduction and disconnection of the total positive line of the battery pack by configuring switch 1, and the switch box 50 controls the conduction and disconnection of the total negative line of the battery pack by configuring switch 2. The first magnetic ring is arranged in the switch box 50, which can be arranged in the switch box 50, and the switch box 50 protects the first magnetic ring; or it can be arranged on the communication line connecting the battery pack 100 and the charge-discharge converter 40 at both ends of the switch box 50 to guide and concentrate the common-mode interference magnetic field.

[0057] Optionally, the charge-discharge converter includes a power board, a filter circuit and a power line, the filter circuit is arranged on the power board, and a first magnetic ring is arranged on the power line.

[0058] Among them, the power board can be a power supply component that can convert input electrical energy into electrical energy suitable for charging or discharging the battery pack 100, and the filter circuit can be a circuit used to filter out high-frequency noise and clutter and reduce noise and interference in the input electrical energy.

[0059] Specifically, the power board and the filter circuit are connected through a power line, and the filter circuit reduces noise and interference in the input electric energy, thereby improving the stability and efficiency of charging and discharging of the battery pack 100; a first magnetic ring is set on the power line to eliminate common-mode interference signals, thereby ensuring the stability and reliability of the charging and discharging process of the battery pack 100.

[0060] In certain embodiments, the battery pack includes a first controller, and the first controller is configured to filter signals received and sent by the first controller based on a preset filtering algorithm when the battery pack is being charged or discharged.

[0061] Specifically, the battery pack 100 may further include a first controller 60. Since the common-mode interference caused by the charge-discharge converter 40 leads to poor daisy chain communication, the first controller 60 can filter the signals received and sent by the first controller 60 based on a preset filtering algorithm, such as a low-pass filtering algorithm, a high-pass filtering algorithm, or a band-pass filtering algorithm when the battery pack 100 is charging or discharging. For example, based on a preset low-pass filtering algorithm, high-frequency signals higher than a preset threshold value can be shielded.

[0062] Please continue reading Figure 1 The embodiment of the present application provides an energy storage system, which may include a battery pack 100 of any embodiment as described above. Figure 1An energy storage system is exemplarily shown to include one battery pack 100 , but may actually include other numbers of battery packs 100 , which is not limited in the embodiments of the present application.

[0063] In certain embodiments, each line of the energy storage system is a shielded twisted pair line, and the resistance of the line is greater than 100 ohms.

[0064] The shielded twisted pair may be a communication line including a metal shielding layer and used for transmitting digital signals and low-frequency analog signals, and the shielded twisted pair is grounded.

[0065] Specifically, for each line in the energy storage system, using a shielded twisted pair with a resistance greater than 100 ohms can help reduce signal attenuation and distortion, and improve signal reliability and anti-interference capabilities; and the metal shielding layer of the shielded twisted pair can also prevent electromagnetic radiation and electromagnetic interference, ensuring the stability and safety of the system.

[0066] See also Figure 2 and Figure 3 In some embodiments, the energy storage system includes multiple battery clusters, a charge and discharge converter and a second magnetic ring. The battery cluster includes multiple battery packs connected in series. The battery cluster is charged and discharged through the charge and discharge converter. A second magnetic ring is arranged on the line between the battery cluster and the charge and discharge converter.

[0067] Specifically, the energy storage system includes a plurality of battery clusters 1000, a charge-discharge converter 40, and a second magnetic ring (not shown in the figure). The battery cluster 1000 includes a plurality of battery packs 100 connected in series to increase the voltage and capacity of the energy storage system. The battery cluster 1000 is charged and discharged through the charge-discharge converter 40. In the battery cluster 1000, the battery packs 100 and the battery packs 100 are connected through daisy chain communication to achieve data transmission. Since the charge-discharge converter 40 is a switching device, it will cause electromagnetic interference, so that the daisy chain communication is subject to common mode interference, resulting in part or all of the data being unable to be correctly transmitted or being destroyed. The battery cluster 1000 includes multiple battery packs 100 connected in series. When one battery pack 100 is subject to common-mode interference, resulting in data loss or invalidity, it will also affect other battery packs 100 in the same battery cluster 1000, and further affect the charging and discharging of the entire battery cluster 1000. Since there are multiple battery packs 100 connected in series in a battery cluster 1000, the amount of lost or invalid data will be relatively large. In order to ensure the normal operation of charging and discharging, a second magnetic ring can be provided on the line between the battery cluster 1000 and the charge and discharge converter 40. The second magnetic ring can guide and concentrate the interference magnetic field, reduce the common-mode interference of the magnetic field generated by the current on the line between the battery cluster 1000 and the charge and discharge converter 40 on the battery cluster 1000 (including the multiple battery packs 100 connected in series), thereby improving the stability of the battery cluster 1000.

[0068] Optionally, the circuit between the battery cluster and the charge-discharge converter includes a positive circuit and a negative circuit, and both the positive circuit and the negative circuit are provided with a second magnetic ring.

[0069] Specifically, the line between the battery cluster 1000 and the charge and discharge converter 40 includes a positive line and a negative line, and the positive line and the negative line are used to transmit current and control signals to achieve energy conversion and management during the battery charging and discharging process. In order to reduce the impact of common-mode interference on the line, a second magnetic ring is provided on the positive line and the negative line to change the electromagnetic characteristics of the positive line and the negative line, thereby shielding and suppressing the common-mode interference.

[0070] Optionally, the energy storage system further includes a switch box, two ends of which are respectively connected to the battery cluster and the charge and discharge converter, the switch box is configured to control the conduction and disconnection of the line between the battery cluster and the charge and discharge converter, and the second magnetic ring is arranged in the switch box.

[0071] Specifically, the energy storage system further includes a switch box 50, the two ends of which are connected to the battery cluster 1000 and the charge-discharge converter 40, respectively. The switch box 50, the battery cluster 1000 and the charge-discharge converter 40 can be connected through a positive line and a negative line. The switch box 50 is configured to control the conduction and disconnection of the line between the corresponding battery cluster 1000 and the charge-discharge converter 40, that is, the switch box 50 is used to control the circuit connection between the corresponding battery cluster 1000 and the charge-discharge converter 40 to achieve circuit switching and protection during the battery charging and discharging process. A second magnetic ring can be set in the positive line and the negative line of the switch box 50, or inside the switch box 50. When the common-mode interference signal passes through the second magnetic ring, the second magnetic ring will change the magnetic field distribution of the common-mode interference signal, so that a magnetic field shielding area is formed around the second magnetic ring to generate impedance to the common-mode interference signal, reduce the interference generated by the common-mode interference signal, and weaken or suppress the propagation of the common-mode interference signal.

[0072] For example, see again Figure 2 , Figure 2 It is exemplarily shown that a battery cluster 1000 includes three battery packs connected in series, namely battery pack 101, battery pack 102 and battery pack 103. The battery cluster 1000 is charged and discharged through a charge and discharge converter 40. The two ends of the switch box 50 are respectively connected to the battery pack 101 of the battery cluster 1000 and the charge and discharge converter 40. The switch box 50, the battery cluster 1000 and the charge and discharge converter 40 can be connected through a positive line and a negative line.

[0073] For example, see again Figure 3 , Figure 3The example shows an energy storage system including n battery clusters, namely battery cluster 1, battery cluster 2, battery cluster n, etc., each of which includes 3 battery packs. In fact, the battery cluster 1000 may include other numbers of battery packs 100. The embodiment of the present application does not limit the number of charge and discharge converters 40, switch boxes 50 and battery packs 100.

[0074] Optionally, a second magnetic ring is provided on the line between any two connected battery packs.

[0075] Specifically, any two battery packs 100 communicate via a daisy chain. Any two battery packs 100 may be directly connected or indirectly connected. For example, any two battery packs are directly connected via a wire or cable line, and a second magnetic ring is set on the connected line to filter out common mode interference; or, there are other components (such as current sensors, etc.) between any two battery packs, so that when any two battery packs 100 are indirectly connected, the second magnetic ring is set on the line closest to the two battery packs to filter out common mode interference.

[0076] In some embodiments, the energy storage system also includes a second controller, each battery cluster is provided with a corresponding second controller, each battery pack is provided with a corresponding first controller, the second controller corresponding to the target battery cluster and the first controllers of each battery pack in the target battery cluster are connected in series, and the target battery cluster is any battery cluster.

[0077] Specifically, the energy storage system further includes a second controller 70, each battery cluster 1000 is provided with a corresponding second controller 70, wherein the second controller 70 may be a CMU to monitor and manage the battery cluster, and each battery pack 100 is provided with a corresponding first controller 60, wherein the first controller 60 may be a BMU to monitor and control the corresponding battery pack 100. The CMU corresponding to the target battery cluster 1000 and the BMUs of the battery packs in the target battery cluster are connected in series, and the target battery cluster is any battery cluster, to perform data transmission and realize control of the battery cluster 1000.

[0078] For example, see Figure 2 , taking the target battery cluster as battery cluster 1000, where battery cluster 1000 includes three battery packs, namely battery pack 1, battery pack 2, and battery pack 3, as an example, the CMU corresponding to battery cluster 1000 is connected in series with each BMU of battery pack 1, battery pack 2, and battery pack 3 to perform data transmission to realize control of battery cluster 1.

[0079] It is understandable that the energy storage system may further include a third controller (not shown in the figure), which is connected to each of the first controllers 60, and the third controller may be used to manage and control the overall energy storage system. The third controller may receive data from at least one of the first controllers 60 or the second controllers 70, and analyze and process the data to monitor the status of the entire energy storage system, optimize the energy scheduling and power distribution between the battery packs 100 and the battery clusters 1000, and optimize the charging and discharging efficiency of the entire energy storage system; the third controller may also be used to perform fault detection and diagnosis, etc.

[0080] Optionally, the first controller and / or the second controller is configured to read the data of the abnormal node from the first direction or the second direction on the ring line where the node is located when the data of any node is abnormal, and the node includes at least one of the first controller, the second controller, the battery module and the analog acquisition front end, and the first direction is opposite to the second direction.

[0081] The ring line may refer to a ring line in which the first controller, the second controller, the battery module and the analog acquisition front end can read data through bidirectional transmission in the daisy chain communication of at least one of the first controller, the second controller, the battery module and the analog acquisition front end. The node includes at least one of the first controller, the second controller, the battery module and the analog acquisition front end. For example, the node may include the first controller; or the node may include the first controller and the second controller; or the node may include the first controller, the second controller, the battery module and the analog acquisition front end.

[0082] Specifically, by using at least one of the first controller and the second controller, in the case of data abnormality at any node, the data of the abnormal node can be read from the first direction or the second direction on the ring line where the node is located, respectively, and the first direction and the second direction are opposite. For example, a battery cluster includes battery pack 3 and battery pack 4, and the nodes include first controller BMU3, BMU4, and second controller CMU2, and in the battery cluster, CMU2 first reads BMU3, then reads BMU4, and BMU4 feeds back data to CMU2 as the first direction, and the second direction is that CMU2 first reads BMU4, then reads BMU3, and BMU3 feeds back data to CMU2 as the second direction. Assume that the communication connection between CMU2 and BMU3 is abnormal, and CMU2 can no longer obtain the data of BMU3 through the first direction. At this time, CMU2 can obtain the data of BMU3 through the second direction.

[0083] Optionally, the first controller and / or the second controller is configured to determine that the target node data is abnormal when no data of the target node is received within a preset time period and / or the data of the target node is outside a preset numerical range, and the target node is any node.

[0084] Specifically, when at least one of the first controller and the second controller fails to receive data from the target node within a preset time period, it is determined that the target node data is abnormal and the target node is any node; or, when at least one of the first controller and the second controller fails to receive data from the target node within a preset time period and after receiving the data from the target node, the data of the target node is outside the preset numerical range, it is determined that the target node data is abnormal and the target node is any node. Or, when at least one of the first controller and the second controller fails to receive data from the target node within a preset time period and after receiving the data from the target node, the data of the target node is outside the preset numerical range, it is determined that the target node data is abnormal and the target node is any node.

[0085] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0086] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0087] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery pack, characterized in that: It includes a battery module, an analog acquisition front end and a common-mode inductor. The analog acquisition front end is connected to at least one of the battery modules to collect the operating information of the connected battery module. The common-mode inductor is arranged between any two connected analog acquisition front ends.

2. The battery pack according to claim 1, characterized in that: The battery pack also includes a charge and discharge converter and a first magnetic ring. The battery pack is charged and discharged through the charge and discharge converter. The charge and discharge converter and multiple battery modules are connected in series. The first magnetic ring is arranged on the line between the charge and discharge converter and adjacent battery modules.

3. The battery pack according to claim 2, characterized in that: The battery pack also includes a switch box, two ends of which are respectively connected to the battery pack and the charge and discharge converter, the switch box is configured to control the conduction and disconnection of the circuit between the battery module and the charge and discharge converter, and the first magnetic ring is arranged in the switch box.

4. The battery pack according to claim 2, characterized in that: The charge-discharge converter comprises a power board, a filter circuit and a power line. The filter circuit is arranged on the power board, and the first magnetic ring is arranged on the power line.

5. The battery pack according to claim 1, characterized in that: The battery pack includes a first controller, and the first controller is configured to filter a signal received and sent by the first controller based on a preset filtering algorithm when the battery pack is being charged or discharged.

6. An energy storage system, characterized in that: A battery pack comprising any one of claims 1 to 5.

7. The energy storage system according to claim 6, characterized in that: The energy storage system includes a plurality of battery clusters, a charge-discharge converter and a second magnetic ring. The battery cluster includes a plurality of battery packs connected in series. The battery cluster is charged and discharged through the charge-discharge converter. The second magnetic ring is arranged on the line between the battery cluster and the charge-discharge converter.

8. The energy storage system according to claim 7, characterized in that: The circuit between the battery cluster and the charge-discharge converter includes a positive circuit and a negative circuit, and both the positive circuit and the negative circuit are provided with the second magnetic ring.

9. The energy storage system according to claim 7, characterized in that: The energy storage system further includes a switch box, two ends of which are respectively connected to the battery cluster and the charge-discharge converter, the switch box is configured to control the conduction and disconnection of the line between the battery cluster and the charge-discharge converter, and the second magnetic ring is arranged in the switch box.

10. The energy storage system according to claim 7, characterized in that: The second magnetic ring is arranged on the line between any two connected battery packs.

11. The energy storage system according to claim 7, characterized in that: The energy storage system also includes a second controller, each of the battery clusters is provided with a corresponding second controller, each of the battery packs is provided with a corresponding first controller, the second controller corresponding to the target battery cluster and the first controllers of each of the battery packs in the target battery cluster are connected in series, and the target battery cluster is any of the battery clusters.

12. The energy storage system according to claim 11, characterized in that: The first controller and / or the second controller are configured to, when data of any node is abnormal, read the data of the abnormal node from a first direction or a second direction on the ring line where the node is located, respectively. The node includes at least one of the first controller, the second controller, the battery module and the analog acquisition front end, and the first direction is opposite to the second direction.

13. The energy storage system according to claim 11, characterized in that: The first controller and / or the second controller is configured to determine that the target node data is abnormal when no data of the target node is received within a preset time period and / or the data of the target node is outside a preset numerical range. The target node is any of the nodes.

14. The energy storage system according to claim 6, characterized in that: Each line of the energy storage system is a shielded twisted pair line, and the resistance of the line is greater than 100 ohms.

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