Communication system, battery management system and energy storage equipment

Abstract

The utility model discloses a communication system, a battery management system and an energy storage device, and relates to the technical field of communication, and the communication system comprises a host which is provided with a first signal transmitting interface and a first signal receiving interface; the plurality of slaves are provided with second signal sending interfaces and second signal receiving interfaces, the plurality of slaves are sequentially connected in series to form a communication link, and the communication link is arranged between the first signal sending interface and the first signal receiving interface in series; wherein the second signal sending interface of the slave machine is connected with the second signal receiving interface of the adjacent slave machine, or is connected with the first signal receiving interface; the second signal receiving interface of the slave is connected with the second signal transmitting interface of the adjacent slave or is connected with the first signal transmitting interface; the utility model solves the technical problem that the battery management system is troublesome to send control instructions to fire-fighting detection, thermal management and other execution units through the existing communication mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to communication technical field, especially a kind of communication system, battery management system and energy storage equipment. BACKGROUND

[0002] Battery unit in energy storage system is core component, but due to the huge number of batteries and dense arrangement, there may be overheating, short circuit, fire and other safety hazards in the operation process. Therefore, in order to ensure the safe operation of energy storage system, each battery unit must be equipped with fire detection, thermal management and other execution units, and can monitor and respond to abnormal conditions in real time.

[0003] In the existing energy storage system, the commonly used communication methods include daisy chain communication and CAN bus communication, and the technician can consider editing daisy chain communication and CAN bus communication to realize the sending of control instructions to fire detection, thermal management and other execution units. However, the daisy chain communication method usually uses the free protocol defined by the chip manufacturer, which has poor flexibility, and the technician cannot edit the free protocol defined by the chip manufacturer.

[0004] And the existing CAN bus scheme needs complex hardware support, such as dial switch for address configuration, digital input (DI) and digital output (DO) circuit for signal acquisition and control, etc. These additional hardware designs not only increase the cost and complexity of energy storage, but also may introduce potential failure points.

[0005] The technician can also consider using 485 bus scheme to realize, and the communication system based on 485 bus includes a master node and multiple slave nodes, the master node needs to send instructions to each slave node one by one (i.e. "ask"), and then wait for the response of the slave node (i.e. "answer"). However, if there are a large number of slave nodes in the system, the master node needs to poll each node in turn, resulting in low communication efficiency. UTILITARIAN CONTENT

[0006] The main purpose of the utility model is to provide a kind of communication system, battery management system and energy storage equipment, to solve the technical problem that battery management system sends control instructions to fire detection, thermal management and other execution units by existing communication method is more troublesome.

[0007] To achieve the above purpose, the utility model provides a kind of communication system, comprising:

[0008] Host, the host has first signal sending interface and first signal receiving interface;

[0009] a plurality of slave devices, the plurality of slave devices having a second signal transmitting interface and a second signal receiving interface, the plurality of slave devices being connected in series to form a communication link, the communication link being arranged in series between the first signal transmitting interface and the first signal receiving interface;

[0010] The second signal transmitting interface of the slave device is connected with the second signal receiving interface of the adjacent slave device, or is connected with the first signal receiving interface; and the second signal receiving interface of the slave device is connected with the second signal transmitting interface of the adjacent slave device, or is connected with the first signal transmitting interface.

[0011] The master device is configured to transmit a data packet via the first signal transmitting interface, and the slave device is configured to process the data packet when the data packet matching the address of the slave device is received via the second signal receiving interface of the slave device.

[0012] The slave device is further configured to transmit the data packet to the second signal transmitting interface of the adjacent slave device via the second signal transmitting interface of the slave device when the data packet not matching the address of the slave device is received via the second signal receiving interface of the slave device.

[0013] In an embodiment, the communication system further comprises:

[0014] a power-on module, an input end of the power-on module being connected with a power supply end, and output ends of the power-on module being connected with a power supply end of the master device and power supply ends of the plurality of slave devices respectively;

[0015] The power-on module is configured to turn on a path between the master device and the plurality of slave devices and the power supply end when triggered, so as to power on the master device and the plurality of slave devices.

[0016] The master device is further configured to transmit an address registration command via the first signal transmitting interface when powered on, and the slave device is configured to encode an address when the address registration command is received via the second signal receiving interface of the slave device, and transmit the address registration command with an address value increased by one to the second signal receiving interface of the adjacent slave device or to the first signal receiving interface via the second signal transmitting interface of the slave device.

[0017] In an embodiment, the communication system further comprises a plurality of timers, and the plurality of timers are electrically connected with the plurality of slave devices one by one respectively.

[0018] The slave device is configured to control the timer to time when the address registration command is received, and the timer is configured to control the slave device to transmit the address registration command with the address value increased by one when a time length of the timer reaches a preset time length.

[0019] In an embodiment, the first signal sending interface and the second signal sending interface are both RS485 sending interfaces, and the first signal receiving interface and the second signal receiving interface are both RS485 receiving interfaces.

[0020] The utility model also proposes a battery management system, including any preceding communication system, the battery management system is used for with a plurality of battery unit electricity is connected.

[0021] In an embodiment, the battery management system comprises:

[0022] A plurality of AFE modules, a plurality of the AFE module is connected in series to form a daisy chain communication link, the host computer has first daisy chain interface and second daisy chain interface, the daisy chain communication link is arranged in series between the first daisy chain interface and the second daisy chain interface;

[0023] A plurality of the AFE module is also used to be connected with a plurality of the battery unit one to one, and the AFE module is used to collect the state parameter of the battery unit and is transmitted to the host computer through the daisy chain communication link.

[0024] In an embodiment, the slave comprises:

[0025] Temperature adjustment module and main controller, the output of temperature adjustment module is connected with the main controller, and the main controller is used to determine that the temperature of one or more of the battery units is not in the preset temperature range according to a plurality of the state parameters, and the data packet of corresponding address coding is output through the second signal receiving interface 485A, so that the temperature adjustment module is controlled according to the data packet to adjust the temperature of the battery unit to the preset temperature range.

[0026] In an embodiment, the slave comprises:

[0027] Acoustooptic alarm module and main controller, the acoustooptic alarm module is connected with the main controller, and the main controller is used to determine that the state of one or more of the battery units is abnormal according to a plurality of the state parameters, and the data packet of corresponding address coding is output through the second signal receiving interface 485A, so that the acoustooptic alarm module is controlled according to the data packet to issue an alarm.

[0028] The utility model also proposes a kind of energy storage equipment, a plurality of battery units and the battery management system described in any preceding article, and the battery management system is connected with a plurality of the battery unit.

[0029] The utility model discloses a communication system includes host computer and a plurality of slave machines, and a plurality of slave machines are connected in series to form communication link, and communication link is connected in series between first signal sending interface and first signal receiving interface, host computer is used for sending data packet through first signal sending interface, and slave machine is used for when receiving the data packet that matches with own address through the second signal receiving interface of itself, processing data packet, slave machine is also used for when receiving the data packet that does not match with own address through the second signal receiving interface of itself, sending data packet to the second signal sending interface of adjacent slave machine through the second signal sending interface of itself.

[0030] So setting, compared with the existing 485 bus scheme, the utility model discloses communication system host computer only needs to send data packet to communication link, and slave machine is self -operated and is completed address matching and data forwarding operation, and does not need to allocate additional resource for host computer to manage the state of each slave machine, and also does not need similar existing CAN bus dial code switch or complex DI / DO circuit, and user can customize the data packet that host computer sends according to actual demand, to make the utility model can send control instruction for controlling fire detection, heat management and other execution unit.

[0031] In practical application, when the utility model discloses communication system is applied to battery management system, slave machine can be used as battery management module, and the battery management module includes fire detection, heat management and other execution unit, and a plurality of battery management modules correspond to manage a plurality of battery units, when the state of one of battery units is abnormal, host computer outputs corresponding data packet, and corresponding battery management module controls fire detection, heat management and other execution unit according to data packet after receiving the data packet that matches with own address coding, and takes corresponding measures to battery unit, to make battery unit restore normal. ACCURACY

[0032] In order to more clearly illustrate the utility model embodiment or prior art in the technical scheme, below will be used to the drawing in the embodiment or prior art description needed to make a brief introduction, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, according to the structure shown in these drawings, other drawings can also be obtained.

[0033] Figure 1 It is the module schematic diagram of an embodiment of the utility model;

[0034] Figure 2 It is the module schematic diagram of another embodiment of the utility model;

[0035] Figure 3 It is the module schematic diagram of still another embodiment of the utility model;

[0036] Figure 4A module schematic diagram of still another embodiment of the utility model;

[0037] Figure 5 A module schematic diagram of still another embodiment of the utility model;

[0038] Figure 6 A module schematic diagram of still another embodiment of the utility model.

[0039] Explanation of reference numerals:

[0040] 10, host computer;20, slave computer;21, main controller;22, temperature adjustment module;23, audible and visual alarm module;30, timer;40, AFE module;50, power-on module;60, battery unit.

[0041] The utility model discloses the realization, functional characteristics and advantages will combine embodiment, refer to the further illustration of drawing. Specific implementation

[0042] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0043] It needs to be explained that if the embodiment of the utility model has the directionality indication (such as up, down, left, right, front, back……), then the directionality indication is only used to explain the relative position relationship, movement condition etc. between the components in a certain specific posture, if the specific posture changes, then the directionality indication also changes accordingly.

[0044] In addition, if the embodiment of the utility model has the description of "first", "second" etc., then the description of "first", "second" etc. is only for the description purpose, and can not be understood as indicating or suggesting its relative importance or implicitly indicating the number of the indicated technical features. Therefore, the feature with "first", "second" can explicitly or implicitly include at least one feature. In addition, if "and / or" or "and / or" appears in the whole text, its meaning includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical scheme of each embodiment can be combined with each other, but it must be based on the person skilled in the art can realize, when the combination of technical scheme appears contradictory or unachievable, it should be considered that the combination of technical scheme does not exist, also not in the protection scope required by the utility model.

[0045] Battery units in energy storage systems are core components, but due to the large number of batteries and dense arrangement, there may be safety hazards such as overheating, short circuit, fire, etc. during operation. Therefore, in order to ensure the safe operation of the energy storage system, each battery unit must be equipped with fire detection, thermal management and other execution units, and can monitor and respond to abnormal conditions in real time.

[0046] In existing energy storage systems, common communication methods include daisy chain communication and CAN bus communication. Technical personnel can consider editing daisy chain communication and CAN bus communication to implement sending control instructions to fire detection, thermal management and other execution units. However, the daisy chain communication method usually uses a free protocol defined by the chip manufacturer, which has poor flexibility, and technical personnel cannot edit the free protocol defined by the chip manufacturer.

[0047] And editing CAN bus requires complex hardware support, such as dial switch for address configuration, digital input (DI) and digital output (DO) circuit for signal acquisition and control, etc. These additional hardware designs not only increase the cost and complexity of energy storage, but also may introduce potential failure points.

[0048] Technical personnel can also consider using 485 bus implementation, and the communication system based on 485 bus includes a master node and multiple slave nodes. The master node needs to send instructions to each slave node one by one (i.e. "ask"), and then wait for the response of the slave node (i.e. "answer"). However, if there are a large number of slave nodes in the system, the master node needs to poll each node in turn, resulting in low communication efficiency.

[0049] Therefore, the utility model provides a kind of communication system, battery management system and energy storage equipment, to solve the technical problem that battery management system sends control instruction to fire detection, thermal management and other execution units by existing communication mode is more troublesome. In an embodiment of the utility model, Figure 1 , the communication system comprises:

[0050] A host computer 10 has a first signal sending interface and a first signal receiving interface;

[0051] A plurality of slave computers 20 have a second signal sending interface 485B and a second signal receiving interface 485A, and a plurality of slave computers 20 are connected in series to form a communication link, and the communication link is arranged between the first signal sending interface and the first signal receiving interface in series;

[0052] The second signal sending interface 485B of the slave 20 is connected with the second signal receiving interface 485A of the adjacent slave 20 or the first signal receiving interface.

[0053] The host 10 is configured to send a data packet through the first signal sending interface, and the slave 20 is configured to process the data packet when the data packet matching the address of the slave 20 is received through the second signal receiving interface 485A of the slave 20.

[0054] The slave 20 is further configured to send the data packet to the second signal sending interface 485B of the adjacent slave 20 through the second signal sending interface 485B of the slave 20 when the data packet not matching the address of the slave 20 is received through the second signal receiving interface 485A of the slave 20.

[0055] In the embodiment, the host 10 and the slave 20 can be implemented by using a main controller 21, for example, an MCU (Microcontroller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), an SOC (System On Chip) or the like.

[0056] In the embodiment, the first signal sending interface and the second signal sending interface 485B are both RS485 sending interfaces, and the first signal receiving interface and the second signal receiving interface 485A are both RS485 receiving interfaces.

[0057] Through the above arrangement, compared with the existing 485 bus scheme, the host 10 of the utility model communication system only needs to send a data packet to the communication link, and the address matching and data forwarding operations are completed by the slave 20, without the need of allocating additional resources for the host 10 to manage the state of each slave 20, without the need of a CAN bus dial switch or a complex DI / DO circuit similar to the existing one, and the user can customize the data packet sent by the host 10 according to the actual demand, so that the utility model can send a control instruction for controlling the execution unit such as fire detection and thermal management.

[0058] In actual application, when the communication system is applied to the battery management system, the slave 20 can be used as a battery management module, the battery management module includes fire-fighting detection, heat management and other execution units, a plurality of battery management modules correspond to manage a plurality of battery units, when the state of one of the battery units is abnormal, the host 10 outputs the corresponding data packet, and the corresponding battery management module controls the fire-fighting detection, heat management and other execution units to take corresponding measures on the battery unit according to the data packet after receiving the data packet matched with the address code of the battery management module, so that the battery unit returns to normal.

[0059] In an embodiment of the utility model, reference Figure 2 , the communication system further includes:

[0060] The power-on module 50, the input end of power-on module 50 is connected power supply end, the output of power-on module 50 is connected with the power supply end of host 10 and multiple slave 20 respectively;

[0061] The power-on module 50 is used to be triggered, and the passageway between the host 10 and multiple slave 20 and power supply end is turned on, so that the host 10 and slave 20 are powered on;

[0062] The host 10 is further used to send address registration command through the first signal sending interface when being powered on, and the slave 20 is used to carry out address coding when receiving the address registration command through the second signal receiving interface 485A of itself, and the address value of the address registration command is processed by one more and then sent to the second signal receiving interface 485A of adjacent slave 20 or the first signal receiving interface through the second signal sending interface 485B of itself.

[0063] Through the above setting, multiple slave 20 carry out address allocation in turn, so that multiple slave 20 can be initialized and address allocation in order when starting, and the system failure caused by address conflict or inconsistent power-on sequence is avoided.

[0064] In the embodiment, when the address registration commands are sequentially sent by the plurality of slaves 20, the address values of the address registration commands are increased, and the size of the address values is the same as the position of the slave 20 in the communication link, so that the master 10 can not only determine that the address allocation of all the slaves 20 is completed when the address registration command sent by the last slave 20 is received, but also determine the number of the slaves 20 according to the address registration commands. In this way, in actual application, when the utility model is applied to a battery management system, the slave 20 can be a battery management module, and a plurality of battery management modules correspond to manage a plurality of battery units. Since the number of the battery units depends on the actual demand of the user and is not fixed, the master 10 can determine the number of the battery management modules according to the received address registration commands, so as to facilitate the master 10 to determine the position of each battery management module in the communication link, thereby facilitating the master 10 to determine the proportion of the number of the battery units that appear abnormities when one or more battery units appear abnormities, and output corresponding data packets for the corresponding battery management module to receive, so as to control the battery management module to take corresponding measures on the battery unit.

[0065] In an embodiment, referring to Figure 3 , the communication system further comprises a plurality of timers 30, and the plurality of timers 30 are respectively and correspondingly connected with the plurality of slaves 20;

[0066] The slave 20 is configured to control the timer 30 to time when the address registration command is received, and the timer 30 is configured to control the slave 20 to send the address registration command after the time length reaches a preset time length.

[0067] In this way, after the slave 20 receives the address registration command, the slave 20 may need to perform some internal operations (such as address coding, state updating, etc.), and the timer 30 plays a role of time delay to ensure that the slave 20 has completed all necessary preparations before sending the command, so as to ensure that the subsequent address registration command is correct.

[0068] The utility model also proposes a battery management system, including above-mentioned communication system, communication system is used for connecting with a plurality of battery units 60.

[0069] It is worth noting that, since the battery management system of the utility model is based on the above-mentioned communication system, the embodiments of the battery management system of the utility model include all the technical solutions of all the embodiments of the above-mentioned communication system, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0070] In an embodiment of the utility model, referring to Figure 4 , the battery management system comprises:

[0071] a plurality of AFE modules 40, the plurality of AFE modules 40 are connected in series to form a daisy chain communication link, the host 10 has a first daisy chain interface and a second daisy chain interface, and the daisy chain communication link is arranged in series between the first daisy chain interface and the second daisy chain interface;

[0072] The plurality of AFE modules 40 are also electrically connected one-to-one with the plurality of battery units 60, and the AFE module 40 is used to collect the state parameters of the battery unit 60 and transmit the state parameters to the host 10 through the daisy chain communication link.

[0073] In the embodiment, the first daisy chain interface and the second daisy chain interface can be implemented by using RS485 interfaces and CAN interfaces.

[0074] In the embodiment, the AFE module 40 and the slave 20 can be integrated in the same device to reduce the need for external connection cables and interfaces and reduce the volume of the battery management system of the utility model.

[0075] In this way, the host 10 realizes real-time monitoring of the battery unit 60 by periodically acquiring the state parameters (such as voltage, current, temperature, etc.) of each battery unit 60, so that the battery management system of the utility model can discover abnormal conditions in time and take corresponding measures, thereby ensuring that the battery system is always in a safe and efficient working state. For details, refer to the following embodiments:

[0076] In an embodiment, referring to Figure 5 , the slave 20 comprises:

[0077] a temperature adjustment module 22 and a host controller 21, an output end of the temperature adjustment module 22 is electrically connected with the host controller 21, and the host controller 21 is used to determine that the temperature of one or more of the battery units 60 is not in a preset temperature range according to the plurality of state parameters, and output a data packet with a corresponding address code through the second signal receiving interface 485A, so that the host controller 21 corresponding to the data packet controls the temperature adjustment module 22 to adjust the temperature of the battery unit 60 to the preset temperature range.

[0078] Among them, the temperature adjustment module 22 comprises a heating module and a cooling module, wherein the heating module can be implemented by using a resistance heater, a flexible heating film / heating sheet or a hot air circulation heating system, and the cooling module can be implemented by using a liquid cooling system, a thermoelectric refrigeration or an air cooling system.

[0079] Specifically, the host 10 is configured to output a data packet with a corresponding address code when it is determined from the plurality of state parameters that the temperature of one or more of the battery units 60 is below a preset temperature range, and the host controller 21 controls the heating module to heat the battery units 60 according to the data packet to restore the temperature of the battery units 60 to normal.

[0080] The host 10 is also configured to output a data packet with a corresponding address code when it is determined from the plurality of state parameters that the temperature of one or more of the battery units 60 exceeds a preset temperature range, and the host controller 21 controls the refrigeration module to reduce the temperature of the battery units 60 to the preset temperature range according to the data packet to ensure the temperature balance of the battery units 60, thereby improving the performance of the battery units 60 and prolonging the service life of the battery units 60.

[0081] In another embodiment, referring to Figure 6 , the slave 20 comprises:

[0082] The host 10 further comprises an audible and light alarm module 23 and a host controller 21, the audible and light alarm module 23 is electrically connected to the host controller 21, and the host controller 21 is configured to output a data packet with a corresponding address code through the second signal receiving interface 485A when it is determined from the plurality of state parameters that the state of one or more of the battery units 60 is abnormal, so that the host controller 21 controls the audible and light alarm module 23 to issue an alarm according to the data packet.

[0083] When the host 10 detects from the plurality of state parameters that the state parameter of a certain battery unit 60 exceeds a preset safety range (such as excessively low voltage, excessively large current, or excessively high temperature), it is determined that the battery unit 60 is in an abnormal state, and a corresponding control signal is output to the corresponding host controller 21, so that the host controller 21 controls the audible and light alarm module 23 to issue an alarm, thereby issuing a warning to the user or the operation and maintenance personnel through the sound and light signals.

[0084] The utility model further proposes a kind of energy storage equipment, including multiple battery units 60 and the battery management system described above, multiple the battery unit 60 is electrically connected with the battery management system.

[0085] It is worth noting that, since the energy storage equipment of the utility model is based on the above-mentioned battery management system, the embodiments of the energy storage equipment of the utility model include all the technical solutions of all the embodiments of the above-mentioned battery management system, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0086] The above merely illustrates the exemplary embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the technical concept of the present application and by using the content of the present application specification and drawings are included in the patent protection scope of the present application.

Claims

1. A communication system, characterized by The communication system comprises: a host, the host having a first signal sending interface and a first signal receiving interface; a plurality of slaves, the plurality of slaves having second signal sending interfaces and second signal receiving interfaces, the plurality of slaves being connected in series to form a communication link, the communication link being arranged in series between the first signal sending interface and the first signal receiving interface; wherein the second signal sending interface of the slave is connected with the second signal receiving interface of the adjacent slave or the first signal receiving interface, and the second signal receiving interface of the slave is connected with the second signal sending interface of the adjacent slave or the first signal sending interface; the host is configured to send a data packet via the first signal sending interface, and the slave is configured to process the data packet when the data packet matching the address of the slave is received via the second signal receiving interface of the slave; the slave is further configured to send the data packet to the second signal sending interface of the adjacent slave via the second signal sending interface of the slave when the data packet not matching the address of the slave is received via the second signal receiving interface of the slave.

2. The communication system of claim 1, wherein, The communication system further comprises: a power-on module, an input end of the power-on module being connected with a power supply end, and output ends of the power-on module being connected with a power supply end of the host and power supply ends of the plurality of slaves respectively; the power-on module is configured to turn on a path between the host and the plurality of slaves and the power supply end when triggered, so as to power on the host and the slaves; the host is further configured to send an address registration command via the first signal sending interface when powered on, and the slave is configured to encode the address when the address registration command is received via the second signal receiving interface of the slave, and send the address registration command with the address value increased by one to the second signal receiving interface of the adjacent slave or the first signal receiving interface via the second signal sending interface of the slave.

3. The communication system of claim 2, wherein The communication system further comprises a plurality of timers, the plurality of timers being electrically connected with the plurality of slaves one by one respectively; the slave is configured to control the timer to time when the address registration command is received, and the timer is configured to control the slave to send the address registration command with the address value increased by one when the time length reaches a preset time length.

4. The communication system of claim 1, wherein, The first signal sending interface and the second signal sending interface are RS485 sending interfaces, and the first signal receiving interface and the second signal receiving interface are RS485 receiving interfaces.

5. A battery management system, characterized by, The battery management system comprises the communication system according to any one of claims 1 to 4, and the battery management system is configured to be electrically connected with a plurality of battery units.

6. The battery management system of claim 5, wherein, The battery management system comprises: a plurality of AFE modules, the plurality of AFE modules being connected in series to form a daisy chain communication link, the host having a first daisy chain interface and a second daisy chain interface, and the daisy chain communication link being arranged in series between the first daisy chain interface and the second daisy chain interface. A plurality of the AFE modules are also used to be electrically connected with a plurality of the battery units one by one, the AFE module is used to collect the state parameters of the battery unit, and is transmitted to the host computer through the daisy chain communication link.

7. The battery management system of claim 6, wherein, The slave machine comprises: A temperature adjustment module and a host controller, an output end of the temperature adjustment module is electrically connected with the host controller, the host controller is used to determine that the temperature of one or more of the battery units is not in a preset temperature range according to a plurality of the state parameters, and output a data packet with a corresponding address code through the second signal receiving interface 485A, so that the host controller controls the temperature adjustment module to adjust the temperature of the battery unit to the preset temperature range according to the data packet.

8. The battery management system of claim 6, wherein, The slave machine comprises: An audible and visual alarm module and a host controller, the audible and visual alarm module is electrically connected with the host controller, the host controller is used to determine that the state of one or more of the battery units is abnormal according to a plurality of the state parameters, and output a data packet with a corresponding address code through the second signal receiving interface 485A, so that the host controller controls the audible and visual alarm module to issue an alarm according to the data packet.

9. An energy storage device, characterized by, A battery management system according to any one of claims 5 to 8 is electrically connected with a plurality of battery units.

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