Battery management system, energy storage device and electric equipment

Abstract

The utility model discloses a battery management system, an energy storage device and electric equipment. The battery management system comprises a slave control module which comprises an acquisition control unit and a first conversion unit which are connected in sequence; the acquisition control unit is also connected with the battery cell; the first conversion unit is also coupled with the connecting line; the main control module comprises a control unit and a second conversion unit which are connected in sequence; the second conversion unit is also coupled with the connecting line; the filtering module is connected in parallel with the battery cluster; the acquisition control unit is used for acquiring operation data of the battery cell; the control unit is used for generating control signals according to the operation data; the first conversion unit is used for transmitting the operation data to the main control module through the connecting line; the second conversion unit is used for transmitting the control signal to the slave control module through the connecting line; the filtering module is used for filtering operation data and control signals in the electric energy output by the battery cluster. According to the scheme, the cost of the battery management system is reduced, and the maintainability of the battery management system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage technology field especially, relate to a kind of battery management system, energy storage device and electric equipment. BACKGROUND

[0002] Battery management system (BMS) is a set of electronic system for monitoring, control and protection of battery pack. Its main functions include battery state monitoring, battery equalization management, charge and discharge control and safety protection.

[0003] In prior art, most of the modules in battery management system are connected by communication wire harness or radio frequency wireless connection. However, the system architecture is complex when battery management system is connected by wire harness, and wireless communication module needs to be set when battery management system is connected by radio frequency wireless connection, which also causes the existing battery management system to have problems of higher cost and poorer maintainability. SUMMARY

[0004] The utility model provides a kind of battery management system, energy storage device and electric equipment to reduce the cost of battery management system, improve the maintainability of battery management system.

[0005] According to an aspect of the utility model, a kind of battery management system is provided, applied to battery cluster, the battery cluster includes multiple electric core and multiple connection wires;Each electric core is connected by the connection wire in series;The battery management system includes: main control module, filter module and multiple slave control modules;

[0006] The slave control module includes the acquisition control unit and the first conversion unit connected in sequence;The acquisition control unit is also connected with the electric core;The first conversion unit is also coupled with the connection wire connection;The main control module includes the control unit and the second conversion unit connected in sequence;The second conversion unit is also coupled with the connection wire connection;The filter module is connected in parallel with the battery cluster;

[0007] The acquisition control unit is used to acquire the operating data of the electric core;The control unit is used to generate control signal according to the operating data, to control the operating state of the electric core;The first conversion unit is used to transmit the operating data to the main control module by the connection wire;The second conversion unit is used to transmit the control signal to the slave control module by the connection wire;The filter module is used to filter the operating data and the control signal in the battery cluster output electric energy.

[0008] Optionally, the first conversion unit includes: first modem subunit and first coupling subunit;

[0009] The first modulation and demodulation sub-unit is connected between the first coupling sub-unit and the acquisition control unit; and the first coupling sub-unit is coupled with the connection line;

[0010] The first modulation and demodulation sub-unit is used for converting the operation data into operation carrier signals and demodulating the control carrier signals into control signals; and the first coupling sub-unit is used for coupling to send the operation carrier signals and coupling to receive the control carrier signals.

[0011] The second modulation and demodulation sub-unit is connected between the second coupling sub-unit and the control unit; and the second coupling sub-unit is coupled with the connection line.

[0012] The second modulation and demodulation sub-unit is used for converting the control signals into the control carrier signals and demodulating the operation carrier signals into the operation data; and the first coupling sub-unit is used for coupling to send the control carrier signals and coupling to receive the operation carrier signals.

[0013] The second modulation and demodulation sub-unit is used for converting the control signals into the control carrier signals and demodulating the operation carrier signals into the operation data; and the first coupling sub-unit is used for coupling to send the control carrier signals and coupling to receive the operation carrier signals.

[0014] Optionally, the first modulation and demodulation sub-unit and the second modulation and demodulation sub-unit each comprise a power line carrier chip.

[0015] Optionally, the first coupling sub-unit and the second coupling sub-unit each comprise a coupling coil.

[0016] Optionally, the acquisition control unit comprises a battery sampling chip and a microcontroller.

[0017] The battery sampling chip and the microcontroller are both connected between the first conversion unit and the battery cell.

[0018] Optionally, the filtering module comprises a filtering capacitor.

[0019] Optionally, the slave control module is coupled with the connection line in one-to-one correspondence.

[0020] According to another aspect of the present application, there is also provided a kind of energy storage device, the energy storage device includes: central control module, multiple battery clusters and multiple battery management systems described in any one of the above embodiments;

[0021] The battery management system is connected with the battery cluster in one-to-one correspondence;Each battery cluster is connected in parallel;The master control module of the battery management system is connected with the central control module.

[0022] Optionally, the battery cluster comprises a first switch, a second switch, a plurality of battery cells and a plurality of connection lines.

[0023] The first end of the first switch is connected with the positive pole of the battery cluster, the second end of the first switch is connected with the load, the first end of the second switch is connected with the negative pole of the battery cluster, and the second end of the second switch is connected with the load.

[0024] According to another aspect of the present application, a power consuming device is provided, which comprises the energy storage device according to any one of the above embodiments.

[0025] The slave control module and the master control module in the embodiment of the present application communicate through the multiplexed connection line, the operation data of the slave control module and the control signal of the master control module are transmitted through the connection line, and the filter module filters the operation data and the control signal in the output power of the battery cluster. The slave control module and the master control module in the embodiment of the present application realize mutual communication through the connection line, without the need of additionally setting a communication wire harness and a communication plug-in, the battery management system architecture is simple, which is conducive to reducing the cost of the battery management system and improving the maintainability of the battery management system.

[0026] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a schematic diagram of a battery management system provided by the embodiment of the present application;

[0029] Figure 2 is a schematic diagram of another battery management system provided by the embodiment of the present application;

[0030] Figure 3 is a schematic diagram of an energy storage device provided by the embodiment of the present application;

[0031] Figure 4 is a schematic diagram of a battery cluster provided by the embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] The embodiment of the present application provides a battery management system. The battery management system is applied to a battery cluster. Wherein, the battery cluster includes a plurality of battery cells and a plurality of connection lines, and each battery cell is connected in series through the connection lines. Each module in the battery management system realizes mutual communication through the battery cell and the connection line, without the need for additional communication wiring harness and communication plug-in, and the battery management system architecture is simple, which is conducive to reducing the cost of the battery management system and improving the maintainability of the battery management system. Figure 1 is a schematic diagram of a battery management system provided by the embodiment of the present application. Referring to Figure 1 , the battery management system includes a master control module 110, a filter module 120 and a plurality of slave control modules 130.

[0035] The slave control module 130 includes a collection and control unit 131 and a first conversion unit 132 connected in sequence; the collection and control unit 131 is also connected to the battery cell 210; the first conversion unit 132 is also coupled to the connecting line 220; the master control module 110 includes a control unit 111 and a second conversion unit 112 connected in sequence; the second conversion unit 112 is also coupled to the connecting line 220; the filter module 120 is connected in parallel with the battery cluster; the collection and control unit 131 is used to collect operating data of the battery cell 210; the control unit 111 is used to generate a control signal based on the operating data to control the operating status of the battery cell 210; the first conversion unit 132 is used to transmit the operating data to the master control module 110 through the connecting line 220; the second conversion unit 112 is used to transmit the control signal to the slave control module 130 through the connecting line 220; the filter module 120 is used to filter out the operating data and control signals in the power output by the battery cluster.

[0036] Specifically, the acquisition and control unit 131 of the slave control module 130 collects operating data from the connected battery cells 210. Exemplarily, this operating data includes, but is not limited to, the voltage, temperature, and current of the battery cells 210. The first conversion unit 132 receives the operating data collected by the acquisition and control unit 131 and modulates the data. The first conversion unit 132 modulates the signal type of the operating data into a high-frequency signal and transmits the modulated operating data to the connection line 220.

[0037] The second conversion unit 112 in the main control module 110 acquires the operating data transmitted via the connecting line 220. Since the operating data transmitted via the connecting line 220 is a high-frequency signal, the second conversion unit 112 also demodulates the acquired operating data to restore the operating data. The control unit 111 acquires the operating data restored by the second conversion unit 112 and generates a control signal based on the acquired operating data. Furthermore, the second conversion unit 112 can acquire and modulate a control signal. The second conversion unit 112 modulates the control signal into a high-frequency signal and transmits the modulated control signal to the connecting line 220.

[0038] The first conversion unit 132 of the slave control module 130 obtains the control signal transmitted via the connection line 220 and demodulates the obtained control signal to restore the control signal. The acquisition control unit 131 obtains the demodulated control signal and controls the operating state of the battery cells 210 according to the instructions in the demodulated control signal. For example, the acquisition control unit 131 controls the battery cells 210 for balancing. The batteries 210 in the battery cluster are connected in series via the connection line 220. The battery cluster has multiple connection lines 220. The first conversion unit 132 and the second conversion unit 112 can be connected to the same connection line 220 or to different connection lines 220.

[0039] It should be noted that each battery cell 210 is connected in series through the connection line 220, the slave module 130 and the master module 110 in the battery management system multiplex the connection line 220 for communication, and the connection line 220 in the battery cluster transmits the modulated operating data and the modulated control signal in addition to transmitting the electrical energy output by the battery cell 210. Therefore, the filter module 120 is further arranged in the battery management system to filter the electrical energy output by the battery cluster to filter out the modulated operating data and the modulated control signal attached to the electrical energy output by the battery cluster, so as to avoid the influence of the operating data and the control signal generated in the battery cluster on the subsequent battery cluster or the electrical equipment. Exemplarily, the filter module 120 can include a filter capacitor.

[0040] The slave module 130 and the master module 110 in the embodiment of the utility model multiplex the connection line 220 for communication, the operating data of the slave module 130 and the control signal of the master module 110 are transmitted through the connection line 220, and the filter module 120 filters the electrical energy output by the battery cluster to filter out the operating data and the control signal in the electrical energy output by the battery cluster. The slave module 130 and the master module 110 in the embodiment of the utility model realize mutual communication through the connection line 220, do not need to additionally arrange a communication wire harness and a communication plug-in, the battery management system architecture is simple, is favorable for reducing the cost of the battery management system and improving the maintainability of the battery management system.

[0041] Figure 2 is another schematic view of a battery management system provided by the embodiment of the utility model. On the basis of the above embodiment, optionally, referring to Figure 2 The first conversion unit 132 includes a first modulation and demodulation subunit 1321 and a first coupling subunit 1322.

[0042] The first modulation and demodulation subunit 1321 is connected between the first coupling subunit 1322 and the acquisition control unit 131;The first coupling subunit 1322 is coupled with the connection line 220;The first modulation and demodulation subunit 1321 is used to convert the operating data into an operating carrier signal and demodulate a control carrier signal into a control signal;The first coupling subunit 1322 is used to couple and send the operating carrier signal and couple and receive the control carrier signal.

[0043] And / or, the second conversion unit 112 includes a second modulation and demodulation subunit 1121 and a second coupling subunit 1122.

[0044] The second modulation and demodulation sub-unit 1121 is connected between the second coupling sub-unit 1122 and the control unit 111; the second coupling sub-unit 1122 is coupled with the connection line 220; the second modulation and demodulation sub-unit 1121 is used for converting the control signal into a control carrier signal, and demodulating the operation carrier signal into operation data; and the first coupling sub-unit 1122 is used for coupling to send the control carrier signal, and coupling to receive the operation carrier signal.

[0045] Specifically, the collection control unit 131 collects the operation data of the battery cell 210 connected thereto. The first modulation and demodulation sub-unit 1321 obtains the operation data collected by the collection control unit 131, and modulates the operation data. The first conversion unit 132 modulates the signal type of the operation data into a high-frequency signal. Exemplarily, the first modulation and demodulation sub-unit 1321 can be a power line carrier chip. The first coupling sub-unit 1322 obtains the modulated operation data, and couples the modulated operation data to the connection line 220, so that the electric energy transmitted in the connection line 220 carries the operation data. Exemplarily, the first coupling sub-unit 1322 can be a coupling coil. The coupling coil is a device capable of transferring energy from one coil to another coil through magnetic field interaction. It is based on the principle of electromagnetic induction. When an alternating current passes through a coil (called primary coil), an alternating magnetic field is generated. This alternating magnetic field will pass through another coil (called secondary coil), thereby inducing an electromotive force in the secondary coil.

[0046] The second coupling sub-unit 1122 obtains the operation data transmitted in the connection line 220. The second modulation and demodulation sub-unit 1121 demodulates the obtained operation data to restore the operation data. The control unit 111 obtains the operation data restored by the second modulation and demodulation sub-unit 1121, and generates a control signal according to the obtained operation data. In addition, the second modulation and demodulation sub-unit 1121 can also obtain the control signal, and modulate the control signal. The second modulation and demodulation sub-unit 1121 modulates the signal type of the control signal into a high-frequency signal. Exemplarily, the second modulation and demodulation sub-unit 1121 can be a power line carrier chip. The second coupling sub-unit 1122 obtains the modulated control signal, and couples the modulated control signal to the connection line 220, so that the electric energy transmitted in the connection line 220 carries the control signal. Exemplarily, the second coupling sub-unit 1122 can be a coupling coil.

[0047] The first coupling subunit 1322 acquires the control signal transmitted via the connecting line 220, and the first modem subunit 1321 demodulates the acquired control signal to restore the control signal. The acquisition and control unit 131 acquires the demodulated control signal and controls the operating state of the battery cell 210 according to the instructions contained in the demodulated control signal. For example, the acquisition and control unit 131 controls the balancing of the battery cell 210. The acquisition and control unit may include a battery sampling chip and a microcontroller. The battery sampling chip is used to collect operating data of the battery 210, and the microcontroller is used to control the operating state of the battery cell according to the control signal.

[0048] An embodiment of the present utility model also provides an energy storage device. Figure 3 This is a schematic diagram of an energy storage device provided by an embodiment of the present utility model. Figure 3 The energy storage device includes: a central control module 11, multiple battery clusters 12 and multiple battery management systems 13 provided by any of the above embodiments.

[0049] The battery management system 13 is connected to each battery cluster 12 in a one-to-one correspondence; each battery cluster 12 is connected in parallel; the positive and negative electrodes of each battery cluster 12 are connected to the load 20; and the main control module of the battery management system 13 is connected to the central control module 11. The energy storage device 10 provided in this embodiment generally has the beneficial effects of the battery management system 13 provided in any of the above embodiments, and will not be further described here.

[0050] Figure 4 This is a schematic diagram of a battery cluster provided by an embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 4 The battery cluster 12 includes a first switch 230 , a second switch 240 , a plurality of battery cells 210 , and a plurality of connecting wires 220 .

[0051] The battery cells 210 are connected in series via a connecting line 220 ; a first end of a first switch 230 is connected to the positive electrode of the battery cluster 12 ; a second end of the first switch 230 is connected to the load 20 ; a first end of a second switch 240 is connected to the negative electrode of the battery cluster 12 ; a second end of the second switch 240 is connected to the load 20 .

[0052] The present invention also provides an electrical device including the energy storage device provided in any of the above embodiments. The electrical device provided in this embodiment has the beneficial effects of the energy storage device provided in any of the above embodiments, which will not be described in detail here.

[0053] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0054] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery management system, characterized in that: Applicable to a battery cluster, the battery cluster includes multiple battery cells and multiple connecting wires; the battery cells are connected in series through the connecting wires; the battery management system includes: a master control module, a filter module and multiple slave control modules; The slave control module includes a collection control unit and a first conversion unit connected in sequence; the collection control unit is also connected to the battery cell; the first conversion unit is also coupled to the connection line; the master control module includes a control unit and a second conversion unit connected in sequence; the second conversion unit is also coupled to the connection line; the filter module is connected in parallel to the battery cluster; The acquisition and control unit is used to collect the operating data of the battery cell; the control unit is used to generate a control signal based on the operating data to control the operating status of the battery cell; the first conversion unit is used to transmit the operating data to the master control module through the connecting line; the second conversion unit is used to transmit the control signal to the slave control module through the connecting line; the filtering module is used to filter out the operating data and the control signal from the output power of the battery cluster.

2. The battery management system according to claim 1, characterized in that: The first conversion unit includes: a first modulation and demodulation subunit and a first coupling subunit; The first modulation and demodulation subunit is connected between the first coupling subunit and the acquisition control unit; the first coupling subunit is coupled to the connection line; The first modulation and demodulation subunit is used to convert the operation data into an operation carrier signal, and demodulate the control carrier signal into a control signal; the first coupling subunit is used to couple and send the operation carrier signal, and couple and receive the control carrier signal; And / or, the second conversion unit includes: a second modulation and demodulation subunit and a second coupling subunit; The second modulation and demodulation subunit is connected between the second coupling subunit and the control unit; the second coupling subunit is coupled to the connection line; The second modulation and demodulation subunit is used to convert the control signal into the control carrier signal, and demodulate the operation carrier signal into the operation data; the first coupling subunit is used to couple and send the control carrier signal, and couple and receive the operation carrier signal.

3. The battery management system according to claim 2, characterized in that: The first modem subunit and the second modem subunit both include a power line carrier chip.

4. The battery management system according to claim 2, characterized in that: The first coupling subunit and the second coupling subunit both include: a coupling coil.

5. The battery management system according to claim 1, characterized in that: The acquisition control unit includes: a battery sampling chip and a microcontroller; The battery sampling chip and the microcontroller are both connected between the first conversion unit and the battery cell.

6. The battery management system according to claim 1, characterized in that: The filtering module includes: a filtering capacitor.

7. The battery management system according to claim 1, characterized in that: The slave control modules are coupled and connected to the connection lines in a one-to-one correspondence.

8. An energy storage device, characterized in that: include: A central control module, a plurality of battery clusters and a plurality of battery management systems according to any one of claims 1 to 7; The battery management system is connected to the battery clusters in a one-to-one correspondence; the battery clusters are connected in parallel; and the main control module of the battery management system is connected to the central control module.

9. The energy storage device according to claim 8, characterized in that The battery cluster includes: a first switch, a second switch, a plurality of battery cells and a plurality of connecting wires; The battery cells are connected in series via the connecting wire; a first end of the first switch is connected to the positive electrode of the battery cluster; a second end of the first switch is connected to a load; a first end of the second switch is connected to the negative electrode of the battery cluster; and a second end of the second switch is connected to the load.

10. An electrical device, characterized in that: Comprising the energy storage device according to any one of claims 8 to 9.

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