Energy Storage System

Abstract

The present invention relates to an energy storage system, comprising: a battery assembly, for electrically interacting with a host and a DC converter respectively; a host; a DC converter, comprising a second control switch; the DC converter is used to electrically interact with the battery assembly when the second control switch is in a conducting state when connected to the battery assembly, and bypass the target signal of the DC converter when the host provides the target signal to the battery assembly, and provide the target signal to the battery assembly when the host does not provide the target signal to the battery assembly. The energy storage system can avoid ignition, thereby improving the safety of the entire system.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an energy storage system. Background Art

[0002] The demand for new energy products is becoming stronger and stronger, especially for energy storage products. For energy storage products with high power and large battery PACK capacity, considering the weight of the product, the host (inverter + DC output function) and battery PACK are generally designed separately. At this time, they need to be connected by a connecting line. For products that can be packaged together, this connecting line can also be used to connect the battery PACK hand in hand in parallel to the host to provide power to the host.

[0003] However, in order to reduce the size of the host, the DC output function is separated and a separate DC converter is made. The DC converter also needs to use a connecting wire to draw power from the battery assembly. The difference between the connecting wire of the DC converter and the connecting wire connecting the host to the battery assembly is that one end of the connecting wire is embedded in the DC converter, and only one end is connected to the external battery assembly.

[0004] Generally, the host is connected to the battery pack first, and then the DC converter is connected to the battery pack. When the host (for example, the inverter) is connected to the battery pack first, the battery pack transfers the power of the first charging pin BAT+ and the first charging pin BAT- of the battery pack to the first charging pin VBAT+ and the first charging pin VBAT- of the host. At this time, the ports of the first charging pin BAT+ and the first charging pin BAT- of the battery pack are energized; when the DC converter is connected to the battery pack, regardless of whether the switch is closed, because there is a capacitor CE1 in the DC converter, the capacitor CE1 is in a short-circuit state at the moment of charging, so the current will be relatively large, and then when the DC converter is connected to the battery pack, it will cause the connection port to spark. Summary of the invention

[0005] Based on this, it is necessary to provide an energy storage system, by which ignition can be avoided and the safety of the entire system is improved.

[0006] In a first aspect, the present application provides an energy storage system, comprising:

[0007] a battery assembly for electrically interacting with a host and a DC converter, respectively;

[0008] Host;

[0009] A DC converter including a second control switch;

[0010] The DC converter is used to, when connected to the battery assembly, have the second control switch in an on state, electrically interact with the battery assembly, bypass the target signal of the DC converter when the host provides a target signal to the battery assembly, and provide a target signal to the battery assembly when the host does not provide a target signal to the battery assembly.

[0011] In one optional embodiment, the first end of the second control switch is input with a first auxiliary power supply; the DC converter further comprises:

[0012] A first switch module, wherein a control end of the first switch module is connected to a second end of the second control switch;

[0013] Wherein, when the DC converter is connected to the battery assembly, the first end of the first switch module is connected to the first power supply pin of the battery assembly, the second end of the first switch module is connected to the first input end of the DC converter, and the second input end of the DC converter is connected to the second power supply pin of the battery assembly;

[0014] The first switch module is used to disconnect the electrical interaction between the battery assembly and the DC converter when the second control switch is in an off state.

[0015] In one optional embodiment, the first switch module includes:

[0016] A first switch control unit, wherein a control end of the first switch control unit is connected to a second end of the second control switch;

[0017] a first switch, wherein a control end of the first switch is connected to an output end of the first switch control unit, a first end of the first switch is connected to a first power supply pin of the battery assembly, a second end of the first switch is connected to a first input end of the DC converter, and a second input end of the DC converter is connected to a second power supply pin of the battery assembly;

[0018] The first switch control unit is used to output a disconnection signal to the first switch when the second control switch is in an off state, and the first switch is used to disconnect the electrical interaction between the battery assembly and the DC converter based on the disconnection signal.

[0019] In one of the optional embodiments, the first switch module is further used to realize electrical interaction between the battery assembly and the DC converter when the second control switch is in a closed state.

[0020] In one of the optional embodiments, the DC converter further includes:

[0021] A first switch control module, wherein a first input terminal of the first switch control module is connected to a control signal output terminal of the battery assembly, and a second input terminal of the first switch control module inputs a fixed voltage;

[0022] A second switch module, wherein a control end of the second switch module is connected to an output end of the first switch control module;

[0023] The first switch control module is used for outputting a first switch control signal based on the first control signal and the fixed voltage when the control signal output terminal of the battery assembly outputs a first control signal; the second switch module is used for switching the short-circuit state of the first locking pin and the second locking pin in the DC converter to a disconnected state under the action of the first switch control signal;

[0024] The first switch control module is also used to output a second switch control signal when the control signal output end of the battery assembly outputs a second control signal. The second switch module is also used to maintain the short-circuited state of the first locking pin and the second locking pin of the DC converter under the action of the second switch control signal, and the DC converter outputs a target signal to the battery assembly.

[0025] In one optional embodiment, the second switch module includes:

[0026] A first switch unit, wherein a control end of the first switch unit is connected to an output end of the first switch control module;

[0027] A second switch unit, wherein the control end of the second switch unit is connected to the output end of the first switch unit; the first switch unit is used to output a third switch control signal under the action of the first switch control signal, and the second switch unit is used to switch from being connected between the first end and the second end to being connected between the second end and the third end under the action of the third switch control signal.

[0028] In one of the optional embodiments, the first switch unit includes:

[0029] a second switch, wherein a control end of the second switch is connected to an output end of the first switch control module, and a first end of the second switch is connected to a second auxiliary power supply;

[0030] A third switch, wherein a control end of the third switch is connected to a second end of the second switch, a first end of the third switch is grounded, and a second end of the third switch is connected to a control end of the second switch unit.

[0031] In one of the optional embodiments, the second switch unit is a relay, the control end of the relay is connected to the second end of the first switch unit, the first end of the relay is connected to the first locking pin of the battery assembly, the second end of the relay is connected to the second locking pin of the battery assembly, and the third end of the relay is suspended; the relay is used to switch the second end of the relay from being connected to the first end of the relay to being connected to the third end of the relay when the control signal output end of the battery assembly outputs a first control signal.

[0032] In one of the optional embodiments, the first switch control module is a comparator unit, and a voltage value of the first target signal input to a first input terminal of the comparator unit is smaller than the fixed voltage.

[0033] In one optional embodiment, the first switch control module further includes:

[0034] A first feedback unit, wherein a first end of the first feedback unit is connected to a first auxiliary power supply via a voltage-dividing resistor, and a second end of the first feedback unit is connected to a first input end of the comparator unit;

[0035] The first feedback unit is used to process the voltage output by the first auxiliary power supply to obtain a feedback signal at the moment when the first input terminal of the comparator unit switches from the second target signal to the first target signal, and input the feedback signal to the first input terminal of the comparator unit, and the voltage of the feedback signal is greater than the fixed voltage. The switch control module is used to output a second switch control signal when the feedback signal is input to the first input terminal and the fixed voltage is input to the second input terminal. The second switch module is used to output the target signal to the battery assembly under the action of the second switch control signal.

[0036] In the above energy storage system, the DC converter is used to electrically interact with the battery assembly when the second control switch is in the on state when connected to the battery assembly, and bypass the target signal of the DC converter when the host provides a target signal to the battery assembly, and provide the target signal to the battery assembly when the host does not provide a target signal to the battery assembly, so that only when the second control switch is in the on state, the battery assembly will electrically interact with the DC converter, so that when the DC converter is connected to the connection port, there will be no sparking phenomenon. In addition, the DC converter can bypass the target signal of the DC converter when the host provides a target signal to the battery assembly, so that only the host provides the target signal to the battery assembly, so that when the host is unplugged first, the power supply pin of the battery assembly will not be energized, and there will be no sparking phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 Circuit diagram of the product included in the traditional technology;

[0039] Figure 2 A circuit diagram of a host computer and a DC connector connected to a battery assembly in a conventional technology;

[0040] Figure 3 is a structural block diagram of a signal bypass device in one embodiment;

[0041] Figure 4 is a structural block diagram of a signal bypass device in another embodiment;

[0042] Figure 5 is a structural block diagram of an energy storage system in an embodiment;

[0043] Figure 6 A circuit diagram of an energy storage system supporting hot-swap function in another embodiment.

[0044] Description of reference numerals:

[0045] Battery assembly PACK, first switch module 600, first switch control unit 610, first switch 620, first switch control module 700, feedback unit 710, second switch module 800, first switch unit 810, second switch 811, third switch 812, second switch unit 820, third switch module 500, second switch control unit 910, fourth switch 920, second switch control module 200, fourth switch module 400, third switch unit 410, fourth switch unit 420, fifth switch 411, sixth switch 412. DETAILED DESCRIPTION

[0046] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0049] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0050] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0051] like Figure 1 As shown, in traditional technology, the host (inverter + DC output function) and battery components are generally designed separately, and they need to be connected through a connecting wire. For products that can be packaged in parallel, this connecting wire can also be used to connect the battery components hand in hand in parallel to the host to provide power to the host.

[0052] The two ends of the connecting line are respectively connected to the CN2 port of the host and the CN1 port of the battery pack PACK1, and the switches SW1 and SW2 are closed. At this time, the first lock pin REG+ and the second lock pin REG- in the battery pack PACK1 are short-circuited by the short-circuit signal REG+ and the short-circuit signal REG- in the host, that is, the 2nd pin of the optocoupler U1 in the battery pack PACK1 is connected to the ground, and the optocoupler U1 starts to work, pulling the 4th pin of the optocoupler U1 to the ground. At this time, the target signal test1 changes from a high level to a low level. When the controller MCU detects that the target signal test1 is at a low level, the control relay RLY1 is closed. At this time, the battery pack PACK1 transmits the power of the first power supply pin BAT+ and the second power supply pin BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN1 port and the CN3 port, thereby transmitting power to the host. It should be noted that if the controller MCU detects that the target signal test1 is at a high level, the control relay RLY1 is disconnected. At this time, the power of the first power supply pin BAT+ and the second power supply pin BAT- of the battery component PACK1 will not be delivered to the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN1 port and the CN3 port. The same applies to the following battery components PACK. When the battery pack needs to be used together, connect the two ends of the connecting line to the CN3 port of the battery pack PACK1 and the CN4 port of the battery pack PACK2 respectively, close the switch SW3 and the switch SW4, and then the first lock pin REG+ and the second lock pin REG- in the battery pack PACK2 are short-circuited, that is, the 2nd pin of the optocoupler U2 in the battery pack PACK2 is connected to the ground, the optocoupler U2 starts to work, and pulls the 4th pin of the optocoupler U2 to the ground, and then the target signal test2 changes from a high level to a low level. When the controller MCU detects that the target signal test2 is a low level, it controls the relay RLY2 to close, and then the battery pack PACK2 transmits the power of the first power supply pin BAT+ and the second power supply pin BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN4 port and the CN5 port, and transmits power to the host in parallel through the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN3 port of the battery pack PACK1, that is, the battery pack PACK1 and the battery pack PACK2 are connected in parallel.

[0053] In addition, in order to reduce the size of the host, the DC output function is separated and a separate DC converter is made. The DC converter also needs to use a connecting wire to draw power from the battery pack PACK. The difference between the connecting wire of the DC converter and the connecting wire connecting the host to the battery pack PACK is that one end of the connecting wire is embedded in the DC converter, and only one end is connected to the external battery pack PACK. Figure 2 As shown, the original connection method for connecting the DC converter and the battery assembly PACK will have the following problems:

[0054] When the host (inverter) is first connected to the CN6 port of the battery assembly PACK, the battery assembly PACK transmits the power of the first power supply pin BAT+ and the second power supply pin BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN6 port and the CN8 port. At this time, the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN8 port of the battery assembly PACK are energized. When the DC converter is connected to the CN8 port of the battery assembly PACK, regardless of whether the switch SW7 is closed, because there is a capacitor CE1 in the DC converter, the capacitor CE1 is in a short-circuit state at the moment of charging, so the current will be relatively large. Then, when the DC converter is connected to the battery assembly PACK, it will cause sparks at the connection port.

[0055] When the host and the DC converter are connected to the CN6 port and CN8 port of the battery pack PACK respectively, there are two short-circuit control signals at this time, that is, the short-circuit signals REG+ and REG- in the host and the DC converter both short-circuit the first lock pin REG+ and the second lock pin REG- of the battery pack PACK. At this time, no matter whether the host or the DC converter is unplugged (that is, one of the connecting wires is unplugged), the first lock pin REG+ and the second lock pin REG- of the battery pack PACK will still be short-circuited by the short-circuit signals REG+ and REG- in the unplugged host or DC converter, and the first power supply pin VBAT+ and the second power supply pin VBAT- of the CN6 port and the CN8 port of the battery pack PACK are still powered. When the host and the DC converter are working with loads, no matter whether the host or the DC converter is unplugged first, the corresponding connection port will spark due to the current.

[0056] It should be noted that all switches can only be closed after the connecting wires are connected. Similarly, the switches need to be turned on before the connecting wires can be unplugged.

[0057] In summary, under the above working conditions, sparks will occur at the corresponding connection ports, making the safety of the product and the user unprotected.

[0058] In order to solve the above technical problems, the present application provides a signal bypass device, specifically, in combination with Figure 3 As shown, the signal bypass device includes a battery assembly PACK and at least one first external device, and the battery assembly PACK is used to electrically interact with the at least one first external device.

[0059] The battery assembly PACK may be a battery pack. In other embodiments, the battery assembly PACK may also be in other forms, which are not specifically limited here.

[0060] Each first external device includes a signal bypass module, which is used to bypass the local target signal when the battery assembly PACK has received the target signal of other external devices. Specifically, the signal bypass module determines whether to bypass the local target signal by detecting the type of the control signal output from the control signal output end of the battery assembly PACK; for example, when the signal bypass module detects that the control signal output end of the battery assembly PACK outputs the first control signal, the local target signal is bypassed; when the signal bypass module detects that the control signal output end of the battery assembly PACK outputs the second control signal, the target signal is output to the battery assembly PACK.

[0061] The target signal may be a short-circuit control signal of the battery assembly PACK. After receiving the short-circuit control signal, the battery assembly PACK controls the battery assembly PACK to start working so as to electrically interact with each external device connected to the battery assembly PACK. For example, the battery assembly PACK supplies power to each external device connected to the battery assembly PACK, or each external device supplies power to the battery assembly PACK, etc. No specific limitation is made here.

[0062] Among them, after an external device is connected to the battery assembly PACK, the connected external device provides the target signal to the battery assembly PACK, and the first external device connected subsequently cannot provide the target signal to the battery assembly PACK due to the existence of the signal bypass module. It should be noted that the first external device connected to the battery assembly PACK can be the first external device, that is, the external device including the signal bypass module, or it can be another second external device that does not include the signal bypass module.

[0063] In the present application, since there is only one external device that can provide a target signal to the battery assembly PACK, other first external devices will not provide a target signal to the battery assembly PACK. Therefore, when the external device that provides the target signal to the battery assembly PACK is unplugged first, the battery assembly PACK will not work, and the power supply pin of the battery assembly PACK will not be energized, so that sparks will not occur.

[0064] In one of the optional embodiments, the signal bypass module is further used to provide a target signal to the battery assembly PACK when the battery assembly PACK does not receive a target signal from other external devices.

[0065] In this embodiment, that is, when the first external device connected to the battery assembly PACK is the first external device, the signal bypass module of the first external device provides the target signal to the battery assembly PACK. Optionally, the default state of the first external device is set to provide the target signal to the battery assembly PACK. After the first external device is connected to the battery assembly PACK, the signal bypass module detects that the control signal output by the control signal output terminal of the battery assembly PACK is the second control signal (at this time, since no external device is connected to the battery assembly PACK, the battery assembly PACK does not work), and then the first external device outputs the target signal to the battery assembly PACK.

[0066] Among them, after the first external device is connected to the battery assembly PACK, the battery assembly PACK works, and the first external devices connected subsequently do not provide the target signal to the battery assembly PACK. However, in order to ensure normal operation, when the number of first external devices is greater than or equal to two, it is necessary to limit the order in which the first external devices connected to the battery assembly PACK are unplugged. For example, the first external device that does not provide the target signal to the battery assembly PACK needs to be unplugged first. When the number of first external devices is one, the order in which the external devices are unplugged is not restricted. Therefore, at this time, after the first connected external device is unplugged, the first external device connected later can provide the target signal to the battery assembly PACK. When the first external device connected later is unplugged first, it will not affect the operation of the first external device connected. For details, please refer to the analysis below.

[0067] In one of the optional embodiments, the system further includes: a second external device, which is connected to the battery assembly PACK and is used to provide a target signal to the battery assembly PACK when the battery assembly PACK does not receive the target signal from the first external device.

[0068] In the present application, the second external device is a device that does not include a signal bypass module. Therefore, if both the second external device and the first external device are connected to the battery assembly PACK, the second external device needs to be connected first, and the second external device provides the target signal to the battery assembly PACK. When the first external device is subsequently connected, the first external device bypasses the local target signal. When the number of first external devices is greater than or equal to two, the first external device that does not provide the target signal to the battery assembly PACK needs to be unplugged first. When the number of first external devices is one, the first external device can be unplugged first, or the second external device can be unplugged first.

[0069] In summary, the connection methods in this application may include:

[0070] 1. At least one first external device is connected to the battery assembly PACK. At this time, the first external device connected to the battery assembly PACK provides a target signal to the battery assembly PACK, including:

[0071] 1.1. Two first external devices are connected to the battery assembly PACK. The order in which the two first external devices are connected to the battery assembly PACK and the order in which they are disconnected are not specifically limited.

[0072] 1.2. Three or more first external devices are connected to the battery assembly PACK. The order in which the two first external devices are connected to the battery assembly PACK is not specifically limited, but the order in which they are unplugged is to first unplug the first external device that does not provide the target signal. When there are two remaining external devices, the situation described in 1.1 is followed.

[0073] 1.3. Only one first external device is connected to the battery pack PACK, and the first external device provides a target signal to the battery pack PACK.

[0074] 2. A second external device and at least one first external device are connected to the battery assembly PACK, including:

[0075] 2.1. A second external device and a first external device are connected to the battery assembly PACK, wherein the second external device is first connected to the battery assembly PACK, so that the second external device provides a target signal to the battery assembly PACK, and subsequently the first external device can be unplugged first, or the second external device can be unplugged first.

[0076] 2.2. A second external device and at least two first external devices are connected to the battery assembly PACK. At this time, the second external device provides a target signal to the battery assembly PACK. The order of unplugging is to first unplug the first external device that does not provide the target signal. When there is one first external device and one second external device left, refer to the above operation.

[0077] The first external device and the second external device in the present application can both be a host or a DC converter.

[0078] In accordance with the above, the first external device includes a signal bypass module. Optionally, the first external device may also include a signal control module, which is used to control the connection and disconnection between the power supply pin of the battery assembly PACK and the first external device. The structure of the signal bypass module and the structure of the signal control module are specifically described below.

[0079] When the DC converter and the host are both the first external device, in order to distinguish the two, the signal control module of the DC converter includes a first switch module 600, and the first switch module 600 includes a first switch control unit 610 and a first switch 620. The signal control module of the host includes a third switch module 500, and the third switch module 500 includes a second switch control unit 910 and a fourth switch 920. The signal bypass module in the DC converter includes a first switch control module 700 and a second switch module 800, the second switch module 800 includes a first switch unit 810 and a second switch unit 820, the first switch unit 810 includes a second switch 811 and a third switch 812, and the first switch control module 700 also includes a first feedback unit. The signal bypass module in the host includes a second switch control module 200 and a fourth switch module 400, the fourth switch module 400 includes a third switch unit 410 and a fourth switch unit 420, the third switch unit 410 includes a fifth switch 411 and a sixth switch 412, and the second switch control module 200 also includes a second feedback unit. When introducing the first external device in the present application, the names of the modules and units in the DC converter are used to illustrate the first external device. The same connection relationship and principle can also be applied to the modules and units in the host.

[0080] In one of the optional embodiments, in combination Figure 4 As shown, the signal bypass module includes a first switch control module 700 and a second switch module 800, wherein the first input end of the first switch control module 700 is connected to the battery assembly PACK control signal output end, and the second input end of the first switch control module 700 inputs a fixed voltage; the control end of the second switch module 800 is connected to the output end of the first switch control module 700.

[0081] The first switch control module 700 is used to output a first switch control signal based on the first control signal and a fixed voltage when the control signal output end of the battery assembly PACK outputs the first control signal; the second switch module 800 is used to switch the short-circuit state of the first locking pin and the second locking pin of the first external device to a disconnected state under the action of the first switch control signal.

[0082] The first switch control module 700 is used to output a second switch control signal when the control signal output end of the battery assembly PACK outputs a second control signal; the second switch module 800 is used to maintain the short-circuited state of the first locking pin and the second locking pin of the first external device under the action of the second switch control signal.

[0083] The first control signal output from the control signal output terminal of the battery assembly PACK is when an external device is connected to the battery assembly PACK and provides a target signal to the battery assembly PACK. The first control signal enters the first switch control module 700, so that the first switch control module 700 outputs the first switch control signal. Under the action of the first switch control signal, the second switch module 800 switches the short-circuit state of the first lock signal and the second lock signal of the first external device to the disconnected state, so that the first external device bypasses the target signal to ensure that only one target signal is received in the battery assembly PACK. In addition, it should be noted that no matter how many subsequent first external devices are connected to the battery assembly PACK, due to the presence of a signal bypass module in the first external device, the local target signal of the first external device is bypassed, so that only one target signal is received in the battery assembly PACK.

[0084] When the first external device is connected to the battery assembly PACK and the control signal output end of the battery assembly PACK outputs the second control signal, that is, no external device is connected to the battery assembly PACK, the first switch control module 700 outputs the second switch control signal, and the second switch module 800 is used to maintain the short-circuited state of the first locking pin and the second locking pin of the first external device under the action of the second switch control signal.

[0085] Combination Figure 4 As shown, in this embodiment, the output terminal of the battery assembly PACK (such as Figure 5 Port CN12, port CN10, and Figure 6 The ports CN14 and CN15 in the figure include a control signal output pin, a first locking pin, a second locking pin, a first power supply pin and a second power supply pin, and the corresponding ports of the first external device (such as Figure 5 Port CN13 in and Figure 6 The ports CN16 and CN17 in the figure may include a target signal input pin, a first locking pin, a second locking pin, a first power supply pin, and a second power supply pin. When the first external device is connected to the battery assembly PACK, the corresponding pins are connected. The corresponding port of the second external device (such as Figure 5The port CN11 in the battery pack includes a first locking pin, a second locking pin, a first power supply pin and a second power supply pin. When the second external device is connected to the battery pack PACK, the corresponding pins are connected. In order to achieve the connection between the external device and the battery pack PACK, the present application can also introduce a connecting wire unit, one end of which can be inserted into the output port of the battery pack PACK, or unplugged from the output port of the battery pack PACK; the other end of the connecting wire unit can be connected to the first external device or the second external device through the corresponding port of the first external device or the second external device, that is, the function of the connecting wire unit is to connect the output port of the battery pack PACK to the corresponding port in the first external device or the second external device.

[0086] Optionally, combined Figure 5 or Figure 6 As shown, the first switch control module 700 is a comparator unit (such as Figure 5 The comparator unit U5B in the Figure 6 The comparator unit U6B and the comparator unit U7B in the embodiment of the present invention are connected to the first input terminal of the comparator unit. The voltage value of the first control signal input to the first input terminal of the comparator unit is less than the fixed voltage. The first input terminal of the comparator unit is directly or indirectly connected to the target signal input pin of the first external device. For example, the first input terminal of the comparator unit U5B is connected to the first input terminal of the comparator unit U6B through the first resistor (such as Figure 5 Resistor R15 in, or Figure 6 The resistor R42 and the resistor R30 in the first external device are connected to the target signal input pin of the port of the first external device, and the second input end of the comparator unit is connected to the output end of a voltage divider circuit to input a fixed voltage. Figure 5 , the voltage divider circuit may include a second resistor (such as Figure 5 The resistor R10 in the Figure 6 The resistor R36 and the resistor R22 in the embodiment and the third resistor (such as Figure 5 Resistor R13 in, or Figure 6 The first end of the third resistor is grounded, the second end is connected to the second resistor and the second input end of the comparator unit, and the second end of the second resistor is connected to the first auxiliary power supply (such as Figure 5 Auxiliary power supply VCC4 and Figure 6 The auxiliary power supply VCC4 and the auxiliary power supply VCC6 in the figure), in other embodiments, the voltage divider circuit can be in other forms, which are not specifically limited here.

[0087] In this embodiment, the first control signal enters the positive input terminal "+" (i.e., the first input terminal of the comparator mentioned above) of the comparator unit, and the signal of the negative input terminal "-" (i.e., the second input terminal of the comparator mentioned above) of the comparator unit is the voltage value of the third resistor, i.e., the voltage value of the first auxiliary power supply after being divided by the second resistor and the third resistor to the ground. Since the voltage value of the first control signal is lower than the voltage value across the third resistor, the comparator unit outputs the first switch control signal. In this embodiment, after the battery assembly PACK is connected to an external device (e.g., the first external device or the second external device), the battery assembly PACK outputs the first control signal, so that the comparator unit outputs the first switch control signal. Optionally, the first switch control signal is at a low level. Under the action of the first switch control signal, the second switch module 800 switches the short-circuited state of the first lock signal and the second lock signal in the first external device to a disconnected state.

[0088] In one of the optional embodiments, in combination Figure 4 As shown, the second switch module 800 includes a first switch unit 810 and a second switch unit 820. The control end of the first switch unit 810 is connected to the output end of the first switch control module 700; the control end of the second switch unit 820 is connected to the output end of the first switch unit 810; the first switch unit 810 is used to output a third switch control signal under the action of the first switch control signal, and the second switch unit 820 is used to switch from being connected between the first end and the second end to being connected between the second end and the third end under the action of the third switch control signal.

[0089] The first switch unit 810 is used to output the third switch control signal under the action of the first switch control signal to control the second switch unit 820 to switch the switch state, wherein the first end and the second end of the second switch unit 820 are connected when the first external device is not connected to the battery assembly PACK. When the control signal output end of the battery assembly PACK outputs the first control signal, the first switch control module 700 outputs the first switch control signal, and under the action of the first switch control signal, the first switch unit 810 outputs the third switch control signal, and under the action of the third switch control signal, the second end of the second switch unit 820 is switched to be connected to the third end, so that the short-circuit state of the first lock signal and the second lock signal of the first external device is switched to the disconnected state, and the first external device bypasses the target signal.

[0090] In one of the optional embodiments, the first switch unit 810 includes a second switch 811 and a third switch 812, the control end of the second switch 811 is connected to the output end of the first switch control module 700, and the first end of the second switch 811 is connected to the second auxiliary power supply; the control end of the third switch 812 is connected to the second end of the second switch 811, the first end of the third switch 812 is grounded, and the second end of the third switch 812 is connected to the control end of the second switch unit 820.

[0091] Optionally, the second switch 811 and the third switch 812 may be triodes. In other embodiments, the second switch 811 and the third switch 812 may also be other devices, which are not specifically limited here. In this embodiment, the second switch 811 may be a first triode (such as Figure 5 The transistor Q1 in the Figure 6 The third switch 812 may be a second transistor (such as the transistor Q5 or the transistor Q9 in FIG. Figure 5 The transistor Q2 in the Figure 6 The transistor Q6 or transistor Q10 in the first switch control module 700, wherein the first switch control signal outputted from the output terminal of the first switch control module 700 is at a low level, that is, the b-pole (base) of the first transistor is pulled low, the first transistor is turned on, and the first auxiliary power supply VCC4 is connected to the first auxiliary power supply VCC4 through the fourth resistor (such as Figure 5 Resistor R9 in, or Figure 6 The resistor R21 and the resistor R35 in the first transistor and the fifth resistor (such as Figure 5 Resistor R14 in, or Figure 6 The resistors R28 and R40 in the circuit) enter the b-pole (base) of the second transistor, and the b-pole and e-pole of the second transistor pass through the eleventh resistor (such as Figure 5 The resistor R16 in the Figure 6 The resistor R29 and the resistor R41 in the circuit are connected to make the second transistor conductive, and then the second auxiliary power supply (such as Figure 5 Auxiliary power supply VCC3 in, or Figure 6 The auxiliary power VCC5 and the auxiliary power VCC3 in the circuit are connected through the second switch unit 820 and the sixth resistor (such as Figure 5 Resistor R12 in, or Figure 6The resistor R24 ​​and the resistor R38 in the first external device and the transistor Q2 form a current loop, the second switch unit 820 starts to work, and the second end of the second switch unit 820 is switched from being connected to the first end to being connected to the third end, thereby switching the short-circuit state of the first locking pin and the second locking pin in the first external device to a disconnected state, so that the first external device bypasses the local target signal. In this way, when an existing external device provides a target signal for the battery assembly PACK, the first external device newly connected to the battery assembly PACK bypasses the local target signal.

[0092] In one optional embodiment, the second switch unit 820 can be a relay (such as Figure 5 Relay RLY5 in, and Figure 6 The relay RLY6 and the relay RLY8 in the battery pack are connected, the control end of the relay is connected to the second end of the first switch unit 810, the first end of the relay is connected to the first locking pin of the battery pack PACK, the second end of the relay is connected to the second locking pin of the battery pack PACK, and the third end of the relay is suspended; when the relay is not working, the second end of the relay is connected to the first end. The relay is used to start working when the control signal output end of the battery pack PACK outputs the first control signal, so that the second end of the relay switches from being connected to the first end of the relay to being connected to the third end of the relay.

[0093] Among them, combined Figure 5 or Figure 6 A control end of the relay is connected to the second end of the first switch unit 810, and another control end of the relay is connected to the second auxiliary power supply.

[0094] In this embodiment, the second switch unit 820 is a relay. Under the action of the third switch control signal output by the first switch unit 810, the relay is switched from being connected between pin 4 (second end) and pin 3 (first end) to being connected between pin 4 (second end) and pin 5 (third end), so that the first locking pin and the second locking pin of the port of the first external device are switched from a short-circuited state to a disconnected state.

[0095] It should be noted that the first end of the second switch unit 820 can be directly connected to the first locking pin of the battery assembly PACK (such as Figure 5 ), or by connecting a switch to the first locking pin of the battery pack PACK (as shown Figure 6As shown), no specific limitation is made here. And the switch between the first end of the second switch unit 820 and the first locking pin of the battery assembly PACK and the control switch in the signal control module can be the same, or two separate switches, and no specific limitation is made here. Optionally, the switch between the first end of the second switch unit 820 and the first locking pin of the battery assembly PACK and the control switch in the signal control module can be located in the above-mentioned connecting line unit.

[0096] In one of the optional embodiments, the first switch control module 700 also includes: a feedback unit 710, a first end of the feedback unit 710 is connected to the first auxiliary power supply through a voltage-dividing resistor, and a second end of the feedback unit 710 is connected to the first input end of the comparator unit; the feedback unit 710 is used to process the first auxiliary power supply to obtain a feedback signal at the moment when the first input end of the comparator unit switches from the second control signal to the first control signal, and input the feedback signal to the first input end of the first switch control module 700, and the voltage of the feedback signal is greater than the fixed voltage, and the first switch control module 700 is used to input the feedback signal at the first input end, and output the second switch control signal when the fixed voltage is input at the second input end; the second switch module 800 is used to output the target signal to the battery assembly PACK under the action of the second switch control signal.

[0097] Optionally, the feedback unit 710 may be a first diode (eg Figure 5 diode D1 in, or Figure 6 The diode D2 and the diode D3 in the circuit are connected to each other, wherein the first end of the first diode is connected to the second auxiliary power supply through a voltage dividing resistor and is connected to the output end of the comparator unit, and the second end of the first diode is connected to the first input end of the comparator unit.

[0098] In this embodiment, if the first external device that does not provide the target signal for the battery pack PACK is unplugged, after disconnecting the connection between the battery pack PACK and the power supply pin corresponding to the first external device, the operation can be performed directly, which does not affect the normal operation of the battery pack PACK. If the first external device that provides the target signal for the battery pack PACK is unplugged (based on the above, the other external devices connected to the battery pack PACK must also be the first external devices, and the number can only be one), the signal bypass module of the remaining first external device that has not been unplugged provides the target signal for the battery pack PACK. If the second external device that provides the target signal for the battery pack PACK is unplugged (based on the above, the other external devices connected to the battery pack PACK must also be the first external devices, and the number can only be one), the signal bypass module of the first external device that has not been unplugged provides the target signal for the battery pack PACK.

[0099] Therefore, if the external device that provides the target signal for the battery pack PACK (for convenience, it is called the third external device) is unplugged, the first lock pin REG+ and the second lock pin REG- of the battery pack PACK are no longer short-circuited by the target signal of the third external device, and the battery pack PACK no longer works. At this time, the output port of the battery pack PACK and the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port of the first external device have no power, so that when the third external device is unplugged, the output port of the battery pack PACK will not spark.

[0100] Among them, the battery assembly PACK may include an optical coupler (such as Figure 5 The optocoupler U4 in the Figure 6 When the first lock pin REG+ and the second lock pin REG- of the battery pack PACK are no longer short-circuited by the target signal of the third external device, the 2nd pin of the optocoupler in the battery pack PACK is suspended, and the optocoupler does not work. In this way, the target signal pin output of the battery pack PACK changes from the first control signal to the second control signal, for example, from a low level to a high level. When the controller MCU detects the second control signal, it controls the relay of the battery pack PACK (such as Figure 5 Relay RLY4 in, or Figure 6 The relay RLY7 in the battery pack is disconnected, and the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port of the battery pack PACK have no power, so that when the third external device is unplugged, the output port of the battery pack PACK will not spark.

[0101] When the third external device is unplugged, the second control signal enters the positive input terminal "+" of the comparator unit. Since the voltage value of the second control signal is higher than the voltage value of the negative input terminal "-", the comparator unit outputs a high level, that is, the second switch 811 is turned off, and the third switch 812 is also turned off, so that the second switch unit 820 is switched from being connected between the first end and the second end to being connected between the second end and the third end, so that the first external device provides a target signal to the battery assembly PACK. Continuing with the above example, the second switch 811 is a first transistor, the third switch 812 is a second transistor, and the second switch unit 820 is a relay. In this way, the comparator unit outputs a high level, the b-pole (base) of the first transistor is a high level, the first transistor is turned off, the second transistor is also turned off, and the relay The RLY5 coil has no current loop, and the relay RLY5 does not work. The connection between pins 4 and 5 is switched to pins 4 and 3, so that the first external device provides a target signal to the battery pack PACK, and then the first lock pin REG+ and the second lock pin REG- in the battery pack PACK are short-circuited by the target signal of the first external device, the battery pack PACK works, and the second control signal becomes the first control signal again, that is, changes from a high level to a low level. When the controller MCU detects the first control signal, it controls the relay RLY4 to close. At this time, the battery pack PACK transmits electricity to the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port, and continues to provide electricity to the first external device, so that it continues to work normally. It should be noted that the time from disconnection to re-closing of the relay RLY4 is extremely short. During this period, the capacitor in the first external device (such as Figure 5 The capacitor CE2 in Figure 6 The energy stored in capacitors CE3 and CE4 in the comparator unit is used to supply power to the load to ensure that the first external device will not be powered off. At the same time, since the positive input terminal "+" entering the comparator unit changes from the second control signal to the first control signal, that is, from a high level to a low level, when it changes to the first control signal, the first auxiliary power supply is connected to the first auxiliary power supply through the seventh resistor (such as Figure 5 Resistor R11 in, or Figure 6 The resistor R23 and the resistor R37 in the circuit), the first diode and the first resistor divide the voltage to the ground, so that the voltage value entering the positive input terminal "+" of the comparator unit, that is, the voltage value of the first resistor to the ground continues to be greater than the voltage value of the negative input terminal "-", so that the comparator unit continues to output a high level to disconnect the second switch 811 and the third switch 812, and then the second switch unit 820 provides a target signal to the battery assembly PACK. Continuing with the above example, the comparator unit continues to output a high level to cut off the first transistor and the second transistor, and then the relay keeps pin 4 and pin 3 connected to maintain the target signal of the first external device to provide the target signal to the battery assembly PACK.

[0102] In this way, after the battery assembly PACK is connected to the second external device, the first external device is connected; or when the second external device is unplugged when the first external device and the second external device are connected to the battery assembly PACK, no sparking phenomenon will occur, which not only improves the safety of the entire system, but also does not affect the original connection method and operation of the external device and the battery assembly PACK and the package, so that the safety and reliability of the product and the safety of the user are better guaranteed.

[0103] In one of the optional embodiments, please continue to combine Figure 4 As shown, the first external device further includes a signal control module, and the signal control module includes a control switch and a first switch module 600. In combination with the above, the control switch in the present application can be located in the connecting line unit.

[0104] In one of the optional embodiments, the first end of the control switch inputs the first auxiliary power supply; the control end of the first switch module 600 is connected to the second end of the control switch. When the first external device is connected to the battery assembly PACK, the first end of the first switch module 600 is connected to the first power supply pin VBAT+ of the battery assembly PACK, the second end of the first switch module 600 is connected to the first input end of the first external device, and the second input end of the first external device is connected to the second power supply pin VBAT- of the battery assembly PACK. It should be noted that the first auxiliary power supply VCC4 can be provided by the auxiliary power supply module in the first external device, wherein the input end of the auxiliary power supply module is connected to the first power supply pin VBAT+ and the second power supply pin VBAT- of the battery assembly PACK, and the output end is used to provide auxiliary power supplies of different voltages.

[0105] The connecting line unit also includes two control pins, one of which is connected to the first auxiliary power supply VCC4, and the two control pins are connected through a control switch, so that the first end of the control switch inputs the first auxiliary power supply VCC4, and the second end of the control switch is connected to the control end of the first switch module 600, so that the switching state of the first switch module 600 can be controlled by the control switch.

[0106] Since all switches can only be closed after the connection line unit is connected, similarly, the switch needs to be opened before the connection line unit can be unplugged. Therefore, when the first external device is connected to the battery assembly PACK, the control switch is in an open state, so that the first switch module 600 is in an open state, and there is no electrical interaction between the battery assembly PACK and the first external device, so that when the first external device is connected to the output port of the battery assembly PACK through the connection circuit, there will be no spark.

[0107] For ease of understanding, an actual operation example is used for explanation. When the battery assembly PACK transmits the power of the pins BAT+ and BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of each output port. At this time, the first external device is connected to the battery assembly PACK. Since the control switch in the first external device is in the disconnected state, the first switch module 600 is in the disconnected state. Even if the first power supply pin VBAT+ and the second power supply pin VBAT-VBAT of the output port of the battery assembly PACK are charged, there is no signal transmission between the battery assembly PACK and the first external device, so that when the first external device is connected to the output port of the battery assembly PACK, there will be no spark.

[0108] In one of the optional embodiments, when the control switch is in a closed state, the first switch module 600 is in an on state, and the battery assembly PACK charges the first external device. After the first external device is connected to the battery assembly PACK and the control switch is closed, the control switch is in an on state, so that a switch control signal can be provided to the first switch module 600, and the first switch module 600 is in an on state, so that the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port of the battery assembly PACK can charge the first external device, and the circuit starts to work normally with load.

[0109] In one optional embodiment, the first switch module 600 includes a first switch control unit 610 and a first switch 620. The control end of the first switch control unit 610 is connected to the second end of the control switch; the control end of the first switch 620 is connected to the output end of the first switch control unit 610, the first end of the first switch 620 is connected to the first power supply pin VBAT+ of the battery assembly PACK, the second end is connected to the first input end of the first external device, and the second input end of the first external device is connected to the second power supply pin VBAT- of the battery assembly PACK.

[0110] Generally, the first power supply pin VBAT+ is a positive power supply pin, and the second power supply pin VBAT- is a negative power supply pin. Thus, a first switch 620 is provided between the positive power supply pin and the first input terminal of the first external device, thereby avoiding the occurrence of sparks.

[0111] Optionally, the first switch control unit 610 may be a third transistor (such as Figure 5 The transistor Q4 in the Figure 6The transistor Q8 and transistor Q12 in the first switch control unit 610 are connected to the control switch directly or indirectly. For example, the b-pole (base) of the third transistor is connected to the second end of the control switch through an eighth resistor (such as Figure 5 Resistor R18 in, or Figure 6 The resistor R32 and the resistor R44 in the control switch are connected to the second end of the control switch, the e-pole (emitter) of the third triode is grounded, and the b-pole of the third triode and the e-pole of the third triode are connected via a ninth resistor (such as Figure 5 The resistor R20 in the Figure 6 The c-pole (collector) of the third triode is directly or indirectly connected to the control end of the first switch 620. For example, the c-pole (collector) of the third triode is connected to the control end of the first switch 620 through the tenth resistor (such as Figure 5 Resistor R19 in, or Figure 6 The resistor R33 and the resistor R45 in the transistor are connected to the control end of the first switch 620.

[0112] Optionally, the first switch 620 may be a MOS tube (metal oxide semiconductor, metal oxide semiconductor) (such as Figure 5 MOS tube Q3 in the Figure 6 MOS tube Q7 and MOS tube Q11 in the embodiment), in other embodiments, the first switch 620 can also be other devices. Among them, the control end of the MOS tube is connected to the output end of the first switch control unit 610, and the control end of the MOS tube is the g pole (gate). When the first switch control unit 610 is a third triode, the output end of the first switch control unit 610 is the c pole (collector) of the third triode. The first end of the MOS tube is the s pole (source), and the second end is the d pole (drain), wherein the source of the MOS tube is connected to the first power supply pin VBAT+ of the battery assembly PACK, for example, through the first power supply pin of the port of the first external device connected to the first power supply pin VBAT+ of the battery assembly PACK, and the drain of the MOS tube is connected to the first input end of the first external device.

[0113] In this way, when the control switch is in the off state, the base of the third transistor is at a low level, the third transistor is cut off, and the first switch control unit 610 outputs a disconnection signal to the first switch 620. The gate and source of the first switch 620 are at the same potential, and the first switch 620 is in the off state, so that the positive electrode of the capacitor in the first external device is disconnected from the first power supply pin VBAT+ of the battery assembly PACK, so that when the first external device is connected to the output port CN12 of the battery assembly PACK, no spark will occur.

[0114] When the control switch is closed, the first auxiliary power source enters the base of the third transistor through the control switch and the eighth resistor, the third transistor is turned on, and the voltage input from the first power supply pin VBAT+ of the first external device is transmitted through the twelfth resistor (such as Figure 5 Resistor R17 in, or Figure 6 The resistors R31 and R43 in the battery assembly PACK and the tenth resistor divide the voltage to the ground. At this time, the gate potential of the MOS tube Q3 is lower than the source potential, that is, the Vgs voltage of the MOS tube Q3 is the voltage across the eighth resistor. The MOS tube is turned on, and the power of the first power supply pin VBAT+ and the second power supply pin VBAT- of the battery assembly PACK starts to charge the capacitor in the first external device, and the circuit starts to work normally with load.

[0115] Among them, when it is necessary to unplug the first external device, it is only necessary to turn on the control switch and unplug the connecting line unit. After unplugging, the first switch module 600 is in a disconnected state. Following the above embodiment, the b-pole (base) of the third transistor changes from a high level to a low level, the third transistor is cut off, the g-pole (gate) and the s-pole (source) of the MOS tube are at the same potential, and the MOS tube is cut off. At this time, the first power supply pin and the second power supply pin of the port of the first external device cannot transmit electricity, so that when the first external device is unplugged, the output port of the battery assembly PACK will not spark, and at the same time, it will not affect the battery assembly PACK to continue to transmit electricity to other external devices.

[0116] For ease of understanding, combined Figure 5 As shown, in one of the optional embodiments, an energy storage system is provided, which includes a battery assembly PACK, a first external device and a second external device, wherein the first external device is a DC converter, and the second external device is a host. The DC converter of the energy storage system is used to, when connected to the battery assembly PACK, have the second control switch in an on state, electrically interact with the battery assembly PACK, and when the host provides a target signal to the battery assembly PACK, bypass the target signal of the DC converter, and when the host does not provide a target signal to the battery assembly PACK, provide a target signal to the battery assembly PACK.

[0117] The specific structure of the DC converter can be combined with Figure 4 as well as Figure 5 The specific definition of the first external device in the embodiment will not be repeated here. The specific structure of the host can be combined with Figure 5 As shown, the host is the second external device, the host is connected to the battery assembly PACK, and optionally the host is connected to the battery assembly PACK through a connecting line unit, and a first control switch is provided on the connecting line for connecting the first locking pin of the output port of the battery assembly PACK and the first locking pin of the port of the host, such as Figure 5 Switch SW8 or SW9 in the control panel.

[0118] Among them, the internal control signal in the battery assembly PACK is to be output to the output port of the battery assembly PACK, such as Figure 5 The signal test1 is output to port CN10 and port CN12, and is used as a detection signal for the DC converter to realize the switching of relay RLY5. The initial state of relay RLY5 is that pin 4 is connected to pin 3.

[0119] like Figure 5 The working principle of the energy storage system shown includes:

[0120] In the case where the host is first connected to the output port CN10 of the battery assembly PACK, when the first control switch SW8 or SW9 is not closed, there is no electrical interaction between the host and the battery assembly PACK. After the first control switch is closed, the host provides a target signal to the battery assembly PACK, and the battery assembly PACK starts to work. Specifically, Figure 5 For example, the control signal output terminal of the battery pack PACK outputs a first control signal, and the first control signal test1 is low level. The MCU detects the low level, controls the relay RLY4 to close, and the battery pack PACK transmits the power of the power supply pin BAT+ and the power supply pin BAT- to the output port CN10 and the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port CN12. When the DC converter is connected to the output port CN12 of the battery pack PACK again, the second control switch SW10 is still in the off state at this time, so the first switch control unit 610 of the first switch module 600, that is, Figure 5 The b pole of transistor Q4 in the transistor is at a low level, and transistor Q4 is turned off; the first switch 620 of the first switch module 600, that is, Figure 5 The g-pole and s-pole of the MOS tube Q3 in the DC converter are at the same potential, and the MOS tube Q3 is cut off, so that the positive electrode of the capacitor CE2 in the DC converter is disconnected from the first power supply pin VBAT+ of the port CN13 of the DC converter, so that when the DC converter is connected, the output port CN12 will not spark. When the second control switch SW10 is closed, the first auxiliary power supply VCC4 enters the b-pole of the transistor Q4 through the second control switch SW10 and the resistor R19, and the transistor Q4 is turned on. The voltage of the first power supply pin VBAT+ is divided to the ground through the resistors R17 and R19. At this time, the g-pole potential of the MOS tube Q3 is lower than the s-pole potential, that is, the Vgs voltage of the MOS tube Q3 is the voltage across the resistor R17. The MOS tube Q3 is turned on, and the first power supply pin VBAT+ starts to charge the capacitor CE2, and the circuit starts to work normally with load.

[0121] At the same time, the first control signal (i.e., the low-level test1 signal) enters the first switch control module 700, i.e., the positive input terminal "+" of the comparator unit U5B. The signal of the negative input terminal "-" of the comparator unit U5B is the voltage value across the resistor R13, i.e., the voltage value of the first auxiliary power supply VCC4 after being divided by the resistors R10 and R13 to the ground. Since the voltage value of the first control signal test1 is lower than the voltage value across the resistor R13, the comparator unit U5B outputs the first switch control signal, which is a low-level signal, that is, the second switch 811 of the first switch unit 810 of the second switch module 800, i.e., the b pole of the transistor Q1 is pulled low, and the transistor Q1 is turned on. The first auxiliary power supply VCC4 enters the third switch 812 of the first switch unit 810 of the second switch module 800, i.e., the transistor Q1, through the resistor R9, the transistor Q1 and the resistor R14. The b-pole of the transistor Q2 turns on the transistor Q2, that is, the first switch unit 810 outputs the third switch control signal, and then the second auxiliary power supply VCC3 forms a current loop through the second switch unit 820, that is, the relay RLY5 coil, the resistor R12, and the transistor Q2, and the relay RLY5 starts to work. The relay RLY5 is switched from being connected between pins 4 and 3 to being connected between pins 4 and 5, so that the first locking pin REG+ and the second locking pin REG- in the DC converter are switched from being short-circuited to being disconnected, so that when the host and the DC converter are both connected to the battery pack PACK, the first locking pin REG+ and the second locking pin REG- of the battery pack PACK are only short-circuited by the first locking pin REG+ and the second locking pin REG- of the host, that is, the host outputs the target signal to the battery pack PACK, so no two target signals exist in the battery pack PACK at the same time.

[0122] When the host and the DC converter are both connected to the battery assembly PACK and are working and under load, if the DC converter needs to be unplugged, it is only necessary to open the second control switch SW10 and unplug the connecting line unit. After unplugging, the first switch control unit 610, that is, the b-pole of the transistor Q4 changes from a high level to a low level, and the transistor Q4 is turned off; the first switch 620, that is, the g-pole and the s-pole of the MOS tube Q3 are equal in potential, and the MOS tube Q3 is turned off. At this time, the first power supply pin VBAT+ and the second power supply pin VBAT- of the port CN13 of the DC converter cannot deliver electricity, so that when the DC converter is unplugged, the port CN13 will not spark. At the same time, it does not affect the battery assembly PACK to continue to deliver electricity to the host.

[0123] When the host and the DC converter are both connected to the battery pack PACK and are working and under load, if the host needs to be unplugged, it is only necessary to open the first control switch SW8 or the first control switch SW9 and unplug the connecting line unit. After unplugging, the first lock pin REG+ and the second lock pin REG- of the battery pack PACK are no longer short-circuited by the target signal of the host, and the battery pack PACK does not work. Specifically, pin 2 of the optocoupler U4 in the battery pack PACK is suspended, the optocoupler U4 does not work, and the first control signal becomes the second control signal, that is, from a low level to a high level. When the MCU detects the second control signal, the control relay RLY4 is disconnected. At this time, the first power supply pins VBAT+ and the first power supply pins VBAT- of the output ports CN10 and CN12 of the battery pack PACK have no power, so that when the connecting line unit is unplugged, the output ports CN10 and CN12 will not spark. At the same time, the second control signal enters the positive input terminal "+" of the comparator unit U5B. Because the voltage value of the second control signal is higher than the voltage value of the negative input terminal "-", the comparator unit U5B outputs a second switch control signal, which is a high level; the second switch 811, that is, the b pole of the transistor Q1 is at a high level, the transistor Q1 is turned off, the third switch 812, that is, the transistor Q2 is also turned off, the second switch unit 820, that is, the relay RLY5 coil has no current loop, the relay RLY5 does not work, and the connection between pins 4 and 5 is switched to pins 4 and 3, so that the first lock pin REG+ and the second lock pin REG- in the DC converter are switched from disconnected to short-circuited, thereby making the battery assembly PA The first lock pin REG+ and the second lock pin REG- in CK are short-circuited by the target signal of the DC converter, and the battery pack PACK works again. Specifically, the 2nd pin of the optocoupler U4 in the battery pack PACK is connected to the ground again, and the optocoupler U4 starts to work and pulls the 4th pin of the optocoupler U4 to the ground. At this time, the second control signal becomes the first control signal again. When the MCU detects the first control signal, it controls the relay RLY4 to close. At this time, the battery pack PACK transmits the power of the power supply pin BAT+ and the power supply pin BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port CN10 and the output port CN12, and continues to provide power to the DC converter so that it continues to work normally. It should be noted that the time from the relay RLY4 being disconnected to being closed again is extremely short. During this period, the load is powered by the energy stored in the capacitor to ensure that the DC converter will not be powered off.At the same time, because the signal entering the positive input terminal "+" of the comparator unit U5B changes from the second control signal to the first control signal, when it changes to a low level, the first auxiliary power supply VCC4 is divided to the ground through the resistor R11, the first feedback unit, that is, the first diode D1 and the resistor R15, so that the voltage value of the positive input terminal "+" entering the comparator unit U5B, that is, the voltage value of the resistor R15 to the ground continues to be greater than the voltage value of the negative input terminal "-", so that the comparator unit U5B continues to output a high level to turn off the second switch 811, that is, the transistor Q1 and the third switch 812, that is, the transistor Q2, and then the relay RLY5 keeps the 4th pin and the 3rd pin connected to maintain the target signal of the DC converter short-circuited.

[0124] It should be noted that the device parameter design must meet the following requirements: the voltage value of the second control signal must be higher than the voltage value of the negative input terminal "-" of the comparator unit U5B; when the second control signal becomes the first control signal, the first auxiliary power supply VCC4 is divided by the resistor R11 and the first feedback unit, that is, the first diode D1 and the resistor R15 to enter the positive input terminal "+" of the comparator unit U5B. The voltage value must be higher than the voltage value of the negative input terminal "-".

[0125] In summary, under the above working conditions, by applying the circuit and method of the present application, no sparking will occur at the connection port, which not only improves the safety of the entire system, but also does not affect the connection method and operation of the original host and battery assembly PACK and the parallel package, so that the safety and reliability of the product and the safety of the user are better guaranteed.

[0126] For ease of understanding, combined Figure 6 In one optional embodiment, a hot-swappable energy storage system is provided, the hot-swappable energy storage system comprising a battery assembly PACK and two first external devices, one of which is a DC converter and the other is a host. The specific working principle of the hot-swappable energy storage system includes:

[0127] When only one host is inserted, the port CN16 of the host is connected to the output port CN14 of the battery assembly PACK through the connecting line unit. When the first control switch SW11 and the first control switch SW12 are in the open (disconnected) state, the battery assembly PACK does not work, and the control signal output end of the battery assembly PACK outputs the second control signal. The high-level second control signal enters the second switch control module 200, that is, the positive input end "+" of the comparator unit U6BU6B. Because the voltage value of the second control signal is higher than the voltage value of the negative input end "-", the comparator unit U6B outputs a high level. , that is, the second control switch module 200 outputs the fifth switch control signal, the fifth switch 411 of the third switch unit 410 of the fourth switch module, that is, the b pole of the transistor Q5 is at a high level, the transistor Q5 is turned off, the sixth switch 412 of the third switch unit 410 of the fourth switch module, that is, the transistor Q6 is also turned off, the fourth switch unit 420 of the fourth switch module, that is, the coil of the relay RLY6 has no current loop, the relay RLY6 does not work, and keeps pin 4 connected to pin 3 (pin 3 is a normally closed switch), so that the first lock pin REG+ and the second lock pin REG- of the host are in a short-circuited state. When the first control switch SW11 and the second control switch SW12 are closed, the first lock pin REG+ and the second lock pin REG- in the battery pack PACK are short-circuited by the target signal of the host, the battery pack PACK works, and the control signal output end of the battery pack PACK outputs a second control signal. When the MCU detects the second control signal, the control relay RLY7 is closed. At this time, the battery pack PACK transmits the power of the power supply pin BAT+ and the power supply pin BAT- to the corresponding first power supply pin BAT+ and the second power supply pin BAT- of the output port CN14 and the output port CN15.

[0128] At the same time, because the positive input terminal "+" of the comparator unit U6B enters the second switch control module 200, it changes from the second control signal to the first control signal. When it changes to a low level, the first auxiliary power supply VCC6 divides the voltage to the ground through the resistor R23, the second diode D2 and the resistor R30, so that the voltage value of the positive input terminal "+" entering the comparator unit U6B, that is, the voltage value of the resistor R30 to the ground continues to maintain a voltage greater than the voltage value of the negative input terminal "-", that is, the second control switch module 200 outputs the fifth switch control signal, so that the comparator unit U6B continues to output a high level to cut off the transistor Q5 and the transistor Q6, and then the relay RLY6 keeps the 4th pin and the 3rd pin connected to maintain the host signal. The first lock pin REG+ and the second lock pin REG- are short-circuited.

[0129] When the DC converter is connected to the battery pack PACK first, that is, the DC converter is first connected to the output port CN15 of the battery pack PACK, the control signal output end of the battery pack PACK outputs a first control signal, the MCU detects a low level, controls the relay RLY7 to close, and the battery pack PACK transmits the power of the power supply pin BAT+ and the power supply pin BAT- to the corresponding first power supply pin BAT+ and second power supply pin BAT- of the output port CN14 and the output port CN15.

[0130] When the host is connected to the output port CN14 of the battery assembly PACK again, the first control switch SW11 and the second control switch SW12 are still in the off state, so the b pole of the transistor Q8 is at a low level, the transistor Q8 is cut off, the g pole and the s pole of the MOS tube Q7 are at the same potential, and the MOS tube Q7 is cut off, so that the positive electrode of the capacitor in the host is disconnected from the first power supply pin VBAT+ of the port CN16, so that the connection port will not spark when the host is connected. When the first control switch SW11 and the second control switch SW12 are closed, the first auxiliary power supply VCC6 enters the b-pole of the transistor Q8 through the first control switch SW11, the second control switch SW12 and the resistor R32, the transistor Q8 is turned on, and the voltage of the first power supply pin VBAT+ is divided to the ground through the resistors R31 and R33. At this time, the g-pole potential of the MOS tube Q7 is lower than the s-pole potential, that is, the Vgs voltage of the MOS tube Q7 is the voltage across the resistor R31, the MOS tube Q7 is turned on, the first power supply pin VBAT+ starts to charge the capacitor CE3, and the circuit starts to work normally with load.

[0131] At the same time, the first control signal enters the second switch control module 200, that is, the positive input terminal "+" of the comparator unit U6B, and the signal of the negative input terminal "-" of the comparator unit U6B is the voltage value across the resistor R27, that is, the voltage value of the first auxiliary power supply VCC6 after being divided by the resistor R22 and the resistor R27 to the ground. Because the voltage value of the first control signal is lower than the voltage value across the resistor R27, the second control switch module 200 outputs the fourth switch control signal, that is, the comparator unit U6B outputs a low level, that is, the b-pole of the transistor Q5 is pulled down, the transistor Q5 is turned on, and the first auxiliary power supply VCC6 enters the b-pole of the transistor Q6 through the resistor R21, the transistor Q5 and the resistor R28, so that the transistor Q6 is turned on, that is, the third switch unit 410 outputs the sixth switch control signal, and then the second auxiliary power supply VCC5 forms a current loop through the fourth switch unit 420, that is, the relay RLY6 coil, the resistor R24, and the transistor Q6, and the relay RLY6 starts to work. The relay RLY6 is switched from being connected between pins 4 and 3 to being connected between pins 4 and 5, so that the first lock pin REG+ and the second lock pin REG- in the host are switched from short circuit to disconnection state, so that when the host and the DC converter are both connected to the battery pack PACK, the first lock pin REG+ and the second lock pin REG- of the battery pack PACK are only short circuited by the target signal of the DC converter, and no two target signals exist at the same time.

[0132] When the host is connected first and then the DC converter is connected, the principle is the same as Figure 5 The principle described is the same as when connecting the host first and then the DC converter. When the DC converter is connected, the connection port will not spark, and only the host's target signal will exist, and no two target signals will exist at the same time.

[0133] When the host is connected first and then the DC converter and both are working under load, if the host needs to be unplugged, just open the first control switch SW11 or the first control switch SW12 and unplug the connecting line unit. After unplugging, the first lock pin REG+ and the second lock pin REG- of the battery assembly PACK are no longer short-circuited by the target signal of the host, and the battery assembly PACK does not work. For example, pin 2 of the optocoupler U7 in the battery assembly PACK is suspended, and the optocoupler U7 does not work. The first control signal becomes the second control signal, for example, from a low level to a high level. When the MCU detects the second control signal, the control relay RLY7 is disconnected. At this time, the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port CN14 and the output port CN15 of the battery assembly PACK have no power, so that when the connecting line unit is unplugged, the connecting port will not spark. At the same time, the second control signal enters the positive input terminal "+" of the comparator U7 of the DC converter. Because the voltage value of the second control signal is higher than the voltage value of the negative input terminal "-", the comparator U7 outputs a high level, that is, the b pole of the transistor Q9 is at a high level, the transistor Q9 is turned off, the transistor Q10 is also turned off, and the switch unit 820, that is, the coil of the relay RLY8 has no current loop, the relay RLY8 does not work, and the connection between pins 4 and 5 is switched to pins 4 and 3, so that the first lock pin REG+ and the second lock pin REG- in the DC converter are switched from disconnected to short-circuited, thereby making the first lock pin REG+ in the battery assembly PACK The second lock pin REG- is short-circuited by the target signal of the DC converter, and the battery pack PACK works again. For example, the 2nd pin of the optocoupler U7 is connected to the ground again, and the optocoupler U7 starts to work and pulls the 4th pin of the optocoupler U7 to the ground. At this time, the second control signal becomes the first control signal. When the MCU detects the first control signal, it controls the relay RLY7 to close. At this time, the battery pack PACK transmits the power of the first power supply pin BAT+ and the second power supply pin BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port CN14 and the output port CN15, and continues to provide power to the DC converter so that it continues to work normally. It should be noted that the time from the relay RLY7 being disconnected to being closed again is extremely short. During this period, the load is powered by the energy stored in the capacitor to ensure that the DC converter will not be powered off. At the same time, because the signal entering the positive input terminal "+" of the comparator U7 changes from the second control signal to the first control signal, when it changes to a low level, the first auxiliary power supply VCC4 is divided to the ground through the resistor R37, the diode D3 and the resistor R42, so that the voltage value entering the positive input terminal "+" of the comparator U7, that is, the voltage value of the resistor R42 to the ground continues to be greater than the voltage value of the negative input terminal "-", so that the comparator U7 continues to output a high level to turn off the transistor Q9 and the transistor Q10, and then the relay RLY8 keeps the 4th pin and the 3rd pin connected to maintain the target signal of the DC converter.

[0134] When the host is connected first, and then the DC converter is connected, and both are working under load, if the DC converter needs to be unplugged, it is only necessary to open the second control switch SW13 and unplug the connecting line unit. After unplugging, the b-pole of the transistor Q12 changes from a high level to a low level, the transistor Q12 is turned off, the g-pole and the s-pole of the MOS tube Q11 are at the same potential, and the MOS tube Q11 is turned off. At this time, the first power supply pin VBAT+ and the second power supply pin VBAT- of the port CN17 cannot deliver electricity, so that when the connecting line unit is unplugged, the connection port will not spark. At the same time, it does not affect the battery assembly PACK to continue to deliver electricity to the host.

[0135] When the DC converter is connected first, and then the host is connected and both are working under load, if the host needs to be unplugged, it is only necessary to open the first control switch SW11 or the first control switch SW12 and unplug the connecting line unit. After unplugging, the fourth switch 920, that is, the b-pole of the transistor Q8 changes from a high level to a low level, the transistor Q8 is turned off, the g-pole and the s-pole of the MOS tube Q7 are at the same potential, and the MOS tube Q7 is turned off. At this time, the first power supply pin VBAT+ and the second power supply pin VBAT- of the port CN16 cannot deliver electricity, so that when the connecting line unit is unplugged, the connecting port will not spark. At the same time, it does not affect the battery assembly PACK to continue to deliver electricity to the DC converter.

[0136] When the DC converter is connected first and then the host is connected and both are working under load, if the DC converter needs to be unplugged, just open the second control switch SW13 and unplug the connecting wire unit. After unplugging, the first lock pin REG+ and the second lock pin REG- of the battery pack PACK are no longer short-circuited by the target signal of the DC converter, and the battery pack PACK does not work. Specifically, pin 2 of the optocoupler U7 in the battery pack PACK is suspended, the optocoupler U7 does not work, and the first control signal becomes the second control signal. When the MCU detects the second control signal, the control relay RLY7 is disconnected. At this time, the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port CN14 and the output port CN15 of the battery pack PACK have no power, so that when the connecting wire unit is unplugged, the connecting port will not spark. At the same time, the second control signal enters the positive input terminal "+" of the comparator unit U6B of the host. Because the voltage value of the second control signal is higher than the voltage value of the negative input terminal "-", the comparator unit U6B outputs a high level, that is, the b pole of the transistor Q5 is at a high level, the transistor Q5 is turned off, the transistor Q6 is also turned off, the relay RLY6 coil has no current loop, the relay RLY6 does not work, and the connection between pins 4 and 5 is switched to pins 4 and 3, so that the first lock pin REG+ and the second lock pin REG- in the host are switched from disconnected to short-circuited, thereby making the first lock pin REG in the battery assembly PACK + and the second lock pin REG- are short-circuited by the target signal of the host, and the battery pack PACK starts to work, that is, the 2nd pin of the optocoupler U7 is connected to the ground again, and the optocoupler U7 starts to work and pulls the 4th pin of the optocoupler U7 to the ground. At this time, the second control signal becomes the first control signal. When the MCU detects the first control signal, it controls the relay RLY7 to close. At this time, the battery pack PACK transmits the power of the power supply pin BAT+ and the power supply pin BAT- to the first power supply pin VBAT+ and the second power supply pin VBAT- of the output port CN14 and the output port CN15, and continues to provide power to the host so that it continues to work normally. It should be noted that the time from the relay RLY7 being disconnected to being closed again is extremely short. During this period, the load is powered by the energy stored in the capacitor to ensure that the host will not be powered off. At the same time, because the signal test1 entering the positive input terminal "+" of the comparator unit U6B changes from the second control signal to the first control signal, when it becomes a low level, the power supply VCC6 divides the voltage to the ground through the resistor R23, the diode D2 and the resistor R30, so that the voltage value entering the positive input terminal "+" of the comparator unit U6B, that is, the voltage value of the resistor R30 to the ground continues to maintain a voltage greater than the voltage value of the negative input terminal "-", so that the comparator unit U6B continues to output a high level to cut off the transistor Q5 and the transistor Q6, and then the relay RLY6 keeps pins 4 and 3 connected to maintain the target signal of the host.

[0137] It should be noted that the device parameter design must meet the following requirements: the voltage value of the second control signal must be higher than the voltage value of the negative input terminal "-" of the comparator; the voltage value of the first control signal entering the positive input terminal "+" of the comparator must be higher than the voltage value of the negative input terminal "-".

[0138] In summary, by applying the circuit and method of the present invention, no matter whether the host or the DC converter is connected first, or the host or the DC converter is unplugged first, the connection port will not spark, and there will only be one short-circuit control signal.

[0139] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0140] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An energy storage system, characterized in that: include: a battery assembly for electrically interacting with a host and a DC converter, respectively; Host; A DC converter including a second control switch; The DC converter is used to, when connected to the battery assembly, have the second control switch in an on state to electrically interact with the battery assembly, and when the host provides a target signal to the battery assembly, bypass the target signal of the DC converter, and when the host does not provide a target signal to the battery assembly, the DC converter provides a target signal to the battery assembly, and the target signal is used to control the battery assembly to start working so as to electrically interact with the DC converter and the host connected to the battery assembly.

2. The energy storage system according to claim 1, characterized in that: The first end of the second control switch is input with a first auxiliary power supply; the DC converter further comprises: A first switch module, wherein a control end of the first switch module is connected to a second end of the second control switch; Wherein, when the DC converter is connected to the battery assembly, the first end of the first switch module is connected to the first power supply pin of the battery assembly, the second end of the first switch module is connected to the first input end of the DC converter, and the second input end of the DC converter is connected to the second power supply pin of the battery assembly; The first switch module is used to disconnect the electrical interaction between the battery assembly and the DC converter when the second control switch is in an off state.

3. The energy storage system according to claim 2, characterized in that: The first switch module comprises: A first switch control unit, wherein a control end of the first switch control unit is connected to a second end of the second control switch; a first switch, wherein a control end of the first switch is connected to an output end of the first switch control unit, a first end of the first switch is connected to a first power supply pin of the battery assembly, a second end of the first switch is connected to a first input end of the DC converter, and a second input end of the DC converter is connected to a second power supply pin of the battery assembly; The first switch control unit is used to output a disconnection signal to the first switch when the second control switch is in an off state, and the first switch is used to disconnect the electrical interaction between the battery assembly and the DC converter based on the disconnection signal.

4. The energy storage system according to claim 3, characterized in that: The first switch module is also used to realize electrical interaction between the battery assembly and the DC converter when the second control switch is in a closed state.

5. The energy storage system according to claim 1, characterized in that: The DC converter further comprises: A first switch control module, wherein a first input terminal of the first switch control module is connected to a control signal output terminal of the battery assembly, and a second input terminal of the first switch control module inputs a fixed voltage; A second switch module, wherein a control end of the second switch module is connected to an output end of the first switch control module; The first switch control module is used for outputting a first switch control signal based on the first control signal and the fixed voltage when the control signal output terminal of the battery assembly outputs a first control signal; the second switch module is used for switching the short-circuit state of the first locking pin and the second locking pin in the DC converter to a disconnected state under the action of the first switch control signal; The first switch control module is also used to output a second switch control signal when the control signal output end of the battery assembly outputs a second control signal. The second switch module is also used to maintain the short-circuited state of the first locking pin and the second locking pin of the DC converter under the action of the second switch control signal, and the DC converter outputs a target signal to the battery assembly.

6. The energy storage system according to claim 5, characterized in that: The second switch module comprises: A first switch unit, wherein a control end of the first switch unit is connected to an output end of the first switch control module; A second switch unit, wherein the control end of the second switch unit is connected to the output end of the first switch unit; the first switch unit is used to output a third switch control signal under the action of the first switch control signal, and the second switch unit is used to switch from being connected between the first end and the second end to being connected between the second end and the third end under the action of the third switch control signal.

7. The energy storage system according to claim 6, characterized in that: The first switch unit comprises: a second switch, wherein a control end of the second switch is connected to an output end of the first switch control module, and a first end of the second switch is connected to a first auxiliary power supply; A third switch, wherein a control end of the third switch is connected to a second end of the second switch, a first end of the third switch is grounded, and a second end of the third switch is connected to a control end of the second switch unit.

8. The energy storage system according to claim 6, characterized in that: The second switch unit is a relay, the control end of the relay is connected to the second end of the first switch unit, the first end of the relay is connected to the first locking pin of the battery assembly, the second end of the relay is connected to the second locking pin of the battery assembly, and the third end of the relay is suspended; the relay is used to switch the second end of the relay from being connected to the first end of the relay to being connected to the third end of the relay when the control signal output end of the battery assembly outputs a first control signal.

9. The energy storage system according to claim 5, characterized in that: The first switch control module is a comparator unit, and a voltage value of the first control signal input to a first input terminal of the comparator unit is smaller than the fixed voltage.

10. The energy storage system according to claim 9, characterized in that: The first switch control module further includes: A first feedback unit, wherein a first end of the first feedback unit is connected to a first auxiliary power supply via a voltage-dividing resistor, and a second end of the first feedback unit is connected to a first input end of the comparator unit; The first feedback unit is used to process the voltage output by the first auxiliary power supply to obtain a feedback signal at the moment when the first input terminal of the comparator unit switches from the second control signal to the first control signal, and input the feedback signal to the first input terminal of the comparator unit, and the voltage of the feedback signal is greater than the fixed voltage. The switch control module is used to input the feedback signal at the first input terminal and output a second switch control signal when the fixed voltage is input at the second input terminal. The second switch module is used to output the target signal to the battery assembly under the action of the second switch control signal.

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