Charging and discharging protection circuit and energy storage equipment

Abstract

The invention relates to a charging and discharging protection circuit and energy storage equipment. The charging and discharging protection circuit comprises a state recognition module and a logic protection module, the first end of the state recognition module is connected with a plurality of battery modules, and the second end of the state recognition module is connected with an inversion module through the logic protection module; the state identification module is used for identifying whether the plurality of battery modules are pulled out of the energy storage equipment or not in the charging and discharging processes of the plurality of battery modules; and the logic protection module is used for outputting a low-level signal under the condition that any one of the plurality of battery modules is pulled out of the energy storage equipment. By adopting the method, the energy storage equipment can be prevented from being damaged or dangerous in the charging and discharging process of the energy storage equipment.

Description

Technical Field

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

[0002] In the current energy storage field, the design and application of energy storage equipment are becoming increasingly diverse. For some energy storage devices, the battery modules can be removed individually, which brings great convenience to users.

[0003] However, when the energy storage device is being charged and discharged, pulling out the battery module in the energy storage device may cause damage to the energy storage device or cause danger.

[0004] Therefore, there is an urgent need for a charge and discharge protection circuit that can prevent energy storage equipment from being damaged or dangerous. Summary of the invention

[0005] Based on this, it is necessary to provide a charging and discharging protection circuit and an energy storage device to address the above technical problems, which can prevent damage to the energy storage device or danger during the charging and discharging process of the energy storage device.

[0006] In a first aspect, the present application provides a charge and discharge protection circuit, which includes: a state recognition module and a logic protection module, wherein a first end of the state recognition module is respectively connected to a plurality of battery modules, and a second end of the state recognition module is connected to an inverter module through the logic protection module;

[0007] A state recognition module, used to recognize whether the multiple battery modules are unplugged from the energy storage device during the charging and discharging process of the multiple battery modules;

[0008] The logic protection module is used to output a low-level signal when any one of the multiple battery modules is unplugged from the energy storage device.

[0009] In one embodiment, the state identification module includes: a plurality of voltage detection units and a switch unit, wherein a first end of each voltage detection unit is connected to a corresponding battery module, a second end of the plurality of voltage detection units is connected to a first end of the switch unit, and a second end of the switch unit is connected to a logic protection module;

[0010] Multiple voltage detection units, used to detect whether corresponding battery modules exist;

[0011] The switch unit is used to be in a disconnected state when multiple battery modules are present; and to be switched to a conductive state when at least one battery module is not present.

[0012] In one embodiment, the switching unit includes a switching tube, a resistor 1 and a resistor 2, the first end of the resistor 1 is respectively connected to multiple voltage detection units, the second end of the resistor 1 is connected to the first end of the resistor 2 and the gate of the switching tube, the drain of the switching tube is connected to the logic protection module, and the source of the switching tube and the second end of the resistor 2 are both grounded.

[0013] In one embodiment, each voltage detection unit includes a resistor three, a first capacitor and a first diode, the first end of the resistor three is connected to the power supply, the second end of the resistor three and the first end of the first capacitor are both connected to the corresponding battery module, the second end of the first capacitor is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the switching unit.

[0014] In one embodiment, the logic protection module includes a first logic protection unit and a second logic protection unit, wherein the first end of the first logic protection unit and the second logic protection unit are connected to the state identification module, the second end of the first logic protection unit is connected to the first switch tube group in the inverter module, and the second end of the second logic protection unit is connected to the second switch tube group in the inverter module;

[0015] During the charging and discharging process of the multiple battery modules, when any one of the multiple battery modules is unplugged from the energy storage device, the first logic protection unit and the second logic protection unit both output low-level signals.

[0016] In one embodiment, the first logic protection unit includes a resistor four, a second diode, a first AND gate sub-unit and a second AND gate sub-unit;

[0017] The first end of resistor four is connected to the state identification module, the second end of resistor four is connected to the cathode of the second diode, the anode of the second diode and the control module in the energy storage device are both connected to the input end of the first AND gate sub-unit, the output end of the first AND gate sub-unit is connected to the first switch tube in the first switch tube group, the anode of the second diode and the control module in the energy storage device are also connected to the input end of the second AND gate sub-unit, and the output end of the second AND gate sub-unit is connected to the second switch tube in the first switch tube group.

[0018] In one embodiment, the first AND gate subunit includes: a resistor five, a resistor six, a resistor seven, a second capacitor and a first AND gate element;

[0019] The first end of resistor five is connected to the input power supply, the second end of resistor five and the positive electrode of the second diode are connected to the first input end of the first AND gate element, the first end of resistor six and the first end of resistor seven are connected to the control module, the second end of resistor seven and the first end of the second capacitor are connected to the second input end of the first AND gate element, and the second end of resistor six and the second end of the second capacitor are grounded.

[0020] In one embodiment, the second AND gate subunit includes resistor eight, resistor nine, resistor ten, a third capacitor, a fourth capacitor, and a second AND gate element;

[0021] The first end of the resistor eight, the first end of the third capacitor, and the anode of the second diode are all connected to the first input end of the second AND gate element, and the second ends of the resistor eight and the third capacitor are grounded;

[0022] The first end of resistor nine and the first end of resistor ten are both connected to the control module, the second end of resistor nine and the first end of the fourth capacitor are both connected to the second input end of the second AND gate element, and the second end of resistor ten and the second end of the fourth capacitor are grounded.

[0023] In one embodiment, the second logic protection unit includes a resistor eleven, a third diode, a third AND gate sub-unit and a fourth AND gate sub-unit;

[0024] The first end of resistor 11 is connected to the state identification module, the second end of resistor 11 is connected to the cathode of the third diode, the anode of the third diode and the control module in the energy storage device are both connected to the input end of the third AND gate sub-unit, the output end of the third AND gate sub-unit is connected to the third switch tube in the second switch tube group, the anode of the third diode and the control module in the energy storage device are also connected to the input end of the fourth AND gate sub-unit, and the output end of the fourth AND gate sub-unit is connected to the fourth switch tube in the second switch tube group.

[0025] In a second aspect, the present application further provides an energy storage device, which includes a plurality of battery modules, an inverter module, a control module and a charge and discharge protection circuit according to any one of the above-mentioned first aspects.

[0026] The above-mentioned charge and discharge protection circuit and energy storage device, the charge and discharge protection circuit includes: a state identification module and a logic protection module, the first end of the state identification module is respectively connected to multiple battery modules, and the second end of the state identification module is connected to the inverter module through the logic protection module; the state identification module is used to identify whether the multiple battery modules are unplugged from the energy storage device during the charge and discharge process of the multiple battery modules; the logic protection module is used to output a low-level signal when any one of the multiple battery modules is unplugged from the energy storage device. During the charge and discharge process of the multiple battery modules, the state identification module in the charge and discharge protection circuit can identify in real time whether the multiple battery modules are unplugged from the energy storage device, and the logic protection module can respond in time based on the identification result, that is, output a low-level signal when any one of the multiple battery modules is unplugged from the energy storage device. In this way, the charge and discharge process of the energy storage device can be cut off in time when the battery module is unplugged, which can avoid damage to the energy storage device or danger. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic diagram of a charge and discharge protection circuit in one embodiment;

[0029] Figure 2 is a schematic diagram of a charge and discharge protection circuit in one embodiment;

[0030] Figure 3 Schematic diagram of a charge and discharge protection circuit in one embodiment.

[0031] Description of reference numerals:

[0032] 10: charge and discharge protection circuit; 11: state identification module; 111: multiple voltage detection units; 112: switch unit; 12: logic protection module; 121: first logic protection unit; 122: second logic protection unit; 20: multiple battery modules; 30: inverter module; 50: energy storage device. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly defined and specified, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be an electrical connection, a direct connection, or an indirect connection through an intermediate medium, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Before introducing the technical solution of the present application in detail, a brief introduction to the background technology of the present application is first given.

[0037] In today's rapidly developing energy storage field, the design and application of energy storage equipment are evolving in an unprecedented direction of diversification. With the widespread application of renewable energy and the increasing demand for efficient energy management, energy storage equipment has become an indispensable key link in the energy system.

[0038] For some energy storage devices, the battery modules can be taken out individually. This design of individual removal brings great convenience to users.

[0039] Take an outdoor portable energy storage device as an example. When the user is outdoors and the battery runs out, the traditional integrated energy storage device may be in a dilemma of no power available. However, for energy storage devices with individually removable battery modules, users can easily remove the depleted battery module and replace it with a fully charged spare battery module, instantly restoring the power supply of the device, allowing activities such as lighting and charging electronic devices to continue, greatly improving the convenience and continuity of use.

[0040] However, during the charging and discharging process of the energy storage device, pulling out the battery module in the energy storage device may cause damage to the energy storage device or cause danger.

[0041] In view of the above problems, the present application provides a charge and discharge protection circuit and an energy storage device, which can prevent damage or danger to the energy storage device during the charging and discharging process of the energy storage device. Of course, the technical solution provided in the embodiments of the present application is not limited to solving only the above problems, but also has other technical effects, which can be specifically referred to in the following embodiments. The technical solution of the present application is described in detail below.

[0042] In one embodiment, Figure 1 As shown, a charge and discharge protection circuit 10 is provided, and the charge and discharge protection circuit 10 includes: a state recognition module 11 and a logic protection module 12, the first end of the state recognition module 11 is respectively connected to a plurality of battery modules 20, and the second end of the state recognition module 11 is connected to the inverter module 30 through the logic protection module 12;

[0043] A state recognition module 11, used to recognize whether the multiple battery modules 20 are unplugged from the energy storage device 50 during the charging and discharging process of the multiple battery modules 20;

[0044] The logic protection module 12 is used to output a low level signal when any one of the multiple battery modules 20 is removed from the energy storage device 50 .

[0045] Among them, multiple battery modules can be represented as battery module 1, battery module 2, battery module 3...battery module N respectively.

[0046] In the embodiment of the present application, the energy storage device 50 includes a plurality of battery modules 20 and a host, and the host may include an inverter module 30 and a control module. The charge and discharge protection circuit 10 may be arranged inside the host, in which case the host includes an inverter module 30, a control module and a charge and discharge protection circuit 10, the charge and discharge protection circuit 10 is arranged between the inverter module 30 and the control module, and the charge and discharge protection circuit 10 is connected to the plurality of battery modules 20. Alternatively, the charge and discharge protection circuit 10 may also be arranged separately inside the energy storage device 50. The embodiment of the present application does not limit the location of the charge and discharge protection circuit 10.

[0047] When the energy storage device 50 is charging, the inverter module 30 is connected to the power grid, and the power grid charges the energy storage device 50; when the energy storage device 50 is discharging, the inverter module 30 is connected to the power-consuming device, and the multiple battery modules 20 in the energy storage device 50 discharge the power-consuming device.

[0048] When the energy storage device 50 is not in the process of charging or discharging, the user pulls out the battery module from the energy storage device 50, which will not cause damage or danger to the energy storage device 50. When the energy storage device 50 is in the process of charging or discharging, the user pulls out the battery module from the energy storage device 50, which will cause damage or danger to the energy storage device 50.

[0049] Based on this, the use scenario of the charge and discharge protection circuit 10 is limited to when the energy storage device 50 is in the process of charge and discharge. The charge and discharge protection circuit 10 includes a state identification module 11 and a logic protection module 12, and each battery module is connected to the state identification module 11.

[0050] The logic protection module 12 in the charge and discharge protection circuit 10 can respond according to the recognition result of the state recognition module 11. Specifically, when the recognition result of the state recognition module 11 is that all battery modules are charged and discharged normally, and any battery module is not unplugged, the level signal output by the logic protection module 12 can be determined according to the level signal input to the logic protection module 12 by the control module. When the recognition result of the state recognition module 11 is that at least one battery module is unplugged, the logic protection module 12 outputs a low-level signal, and the low-level signal will cause multiple switch tubes in the inverter module 30 to be disconnected, so that the charge and discharge process of the energy storage device 50 cannot continue, which can avoid damage or danger to the energy storage device 50.

[0051] The above-mentioned charge and discharge protection circuit 10 includes: a state recognition module 11 and a logic protection module 12, wherein the first end of the state recognition module 11 is respectively connected to the plurality of battery modules 20, and the second end of the state recognition module 11 is connected to the inverter module 30 through the logic protection module 12; the state recognition module 11 is used to identify whether the plurality of battery modules 20 are unplugged from the energy storage device 50 during the charge and discharge process of the plurality of battery modules 20; and the logic protection module 12 is used to output a low-level signal when any one of the plurality of battery modules 20 is unplugged from the energy storage device 50. During the charge and discharge process of the plurality of battery modules 20, the state recognition module 11 in the charge and discharge protection circuit 10 can identify in real time whether the plurality of battery modules 20 are unplugged from the energy storage device 50, and the logic protection module 12 can respond in time based on the recognition result, that is, output a low-level signal when any one of the plurality of battery modules 20 is unplugged from the energy storage device 50, so that the charge and discharge process of the energy storage device 50 can be cut off in time when the battery module is unplugged, and damage or danger to the energy storage device 50 can be avoided.

[0052] Next, the specific contents of the state recognition module 11 are introduced through an embodiment. Figure 2 As shown, the state identification module 11 includes a plurality of voltage detection units 111 and a switch unit 112, the first end of each voltage detection unit is respectively connected to the corresponding battery module, the second end of the plurality of voltage detection units 111 is connected to the first end of the switch unit 112, and the second end of the switch unit 112 is connected to the logic protection module 12;

[0053] A plurality of voltage detection units 111, used to detect whether a corresponding battery module exists;

[0054] The switch unit 112 is configured to be in a disconnected state when a plurality of battery modules 20 are present, and to be switched to a conductive state when at least one battery module 20 is absent.

[0055] In an embodiment of the present application, the specific content of the state identification module 11 in identifying whether the battery module is unplugged from the energy storage device 50 is introduced. The state identification module 11 includes a plurality of voltage detection units 111 and a switch unit 112, and each voltage detection unit is connected to a corresponding battery module. Each battery detection unit is capable of detecting the voltage of the voltage divider resistor in the corresponding battery module. If the battery module is not unplugged, the voltage of the voltage divider resistor in the battery module can be detected to determine that the battery module exists and has not been unplugged; if the battery module is unplugged, the voltage of the voltage divider resistor will become zero or fluctuate abnormally, confirming that the battery module does not exist and has been unplugged.

[0056] The switch unit 112 in the state identification module 11 can detect whether the corresponding battery module exists according to the voltage of the voltage divider resistor in the detected battery module. Specifically, if all the detection voltages meet the preset conditions, it means that during the charging and discharging process of the multiple battery modules 20, no battery module is unplugged. At this time, the switch unit 112 remains in the disconnected state. If at least one detection voltage does not meet the preset conditions, it means that at least one battery module among the multiple battery modules 20 is unplugged. At this time, the switch unit 112 can switch from the disconnected state to the on state. Among them, the switch unit 112 may include a diode switch, a triode switch, a field effect transistor switch or a solid-state relay switch.

[0057] In one embodiment, continue to see Figure 2 As shown, the switch unit 112 includes a switch tube Q, a resistor R1 and a resistor R2, the first end of the resistor R1 is respectively connected to the multiple voltage detection units 111, the second end of the resistor R1 is connected to the first end of the resistor R2 and the gate of the switch tube Q, the drain of the switch tube Q is connected to the logic protection module 12, and the source of the switch tube Q and the second end of the resistor R2 are both grounded.

[0058] Each voltage detection unit includes a resistor R3, a first capacitor C1 and a first diode D1. The first end of the resistor R3 is connected to the power supply VCC, the second end of the resistor R3 and the first end of the first capacitor C1 are both connected to the corresponding battery module, the second end of the first capacitor C1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the switch unit 112.

[0059] It should be noted that the first diode D1 in each voltage detection unit is connected to the first end of the resistor R1 in the switch unit 112. For example, the voltage detection unit corresponding to the battery module 1 includes VCC1, R31 and D11, the corresponding power supply voltage is VCC1, and the voltage divider resistor in the battery module 1 is R 分压1 The voltage detection unit corresponding to battery module 2 includes VCC2, R32 and D12. The corresponding power supply voltage is VCC2. The voltage divider resistor in battery module 2 is R 分压2 The voltage detection unit corresponding to the battery module N includes VCC N 、R3 N and D1 N , the corresponding supply voltage is VCC N , the voltage divider resistor in battery module 2 is R 分压N .

[0060] In the embodiment of the present application, during the charging and discharging process of multiple battery modules 20, the voltage-dividing resistor inside the battery module divides the voltage of the power supply VCC and outputs it to the gate of the switch tube Q. At this time, the gate voltage is small and cannot cause the switch tube Q.

[0061] When at least one battery module in the energy storage device 50 is unplugged, the voltage-dividing resistor in the battery module is disconnected from the charge-discharge protection circuit 10, and voltage division cannot be performed. The power supply VCC directly outputs the power supply voltage to the gate of the switch tube Q. At this time, the gate voltage increases, and the drain and source ends of the switch tube Q are turned on.

[0062] The state identification module 11 includes a plurality of voltage detection units 111 and a switch unit 112, wherein the first end of each voltage detection unit is respectively connected to the corresponding battery module, the second end of the plurality of voltage detection units 111 is connected to the first end of the switch unit 112, and the second end of the switch unit 112 is connected to the logic protection module 12; the plurality of voltage detection units 111 are used to detect whether the corresponding battery module exists; the switch unit 112 is used to be in a disconnected state when the plurality of battery modules 20 exist; and to switch to a conductive state when at least one battery module 20 does not exist. The switch unit 112 includes a switch tube Q, a resistor R1 and a resistor R2, wherein the first end of the resistor R1 is respectively connected to the plurality of voltage detection units 111, the second end of the resistor R1 is connected to the first end of the resistor R2 and the gate of the switch tube Q, the drain of the switch tube Q is connected to the logic protection module 12, and the source of the switch tube Q and the second end of the resistor R2 are both grounded. Each voltage detection unit includes a resistor R3, a first capacitor C1 and a first diode D1, the first end of the resistor R3 is connected to the power supply VCC, the second end of the resistor R3 and the first end of the first capacitor C1 are connected to the corresponding battery module, the second end of the first capacitor C1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the switch unit 112. The circuit can detect whether the corresponding battery module exists in real time through multiple voltage detection units 111, and determine the conduction and disconnection of the switch unit 112 based on the detection result, that is, timely detection and response to the situation of pulling out the battery module during the charging and discharging process, so that the energy storage device 50 can be prevented from being damaged or dangerous.

[0063] Next, the specific contents of the logic protection module 12 in the charge and discharge protection circuit 10 are introduced. Figure 3As shown, the logic protection module 12 includes a first logic protection unit 121 and a second logic protection unit 122, wherein the first ends of the first logic protection unit 121 and the second logic protection unit 122 are connected to the state identification module 11, the second end of the first logic protection unit 121 is connected to the first switch tube group in the inverter module 30, and the second end of the second logic protection unit 122 is connected to the second switch tube group in the inverter module 30;

[0064] During the charging and discharging process of the multiple battery modules 20 , when any one of the multiple battery modules 20 is unplugged from the energy storage device 50 , the first logic protection unit 121 and the second logic protection unit 122 both output low-level signals.

[0065] In the embodiment of the present application, the inverter module 30 in the energy storage device 50 includes two switch tube groups, namely a first switch tube group and a second switch tube group, and each switch tube group includes two switch tubes.

[0066] Based on this, in order to match the inverter module 30, the logic protection module 12 is divided into a first logic protection unit 121 and a second logic protection unit 122. The first logic protection unit 121 is arranged between the state identification module 11 and the first switch tube group of the inverter module 30, and the second logic protection unit 122 is arranged between the state identification module 11 and the second switch tube group of the inverter module 30.

[0067] It should be noted that the input end of the first logic protection unit 121 and the input end of the second logic protection unit 122 are also connected to the control module in the host. The control module can input control signals to the first logic protection unit 121 and the second logic protection unit 122 respectively. The first logic protection unit 121 and the second logic protection unit 122 can output high and low level signals according to the control signal input by the control module and the conduction state of the switch tube Q in the state recognition module 11.

[0068] Each switch tube group in the inverter module 30 includes two switch tubes. Therefore, in the process of designing the first logic protection unit 121, two AND gate sub-units can be designed in the first logic protection unit 121 and the second logic protection unit 122, and the output of each AND gate sub-unit is connected to the corresponding switch tube.

[0069] For the first logical protection unit 121, in one embodiment, see Figure 3 As shown, the first logic protection unit 121 includes a resistor R4, a second diode D2, a first AND gate sub-unit 1211 and a second AND gate sub-unit 1212;

[0070] The first end of the resistor R4 is connected to the state identification module 11, the second end of the resistor R4 is connected to the cathode of the second diode D2, the anode of the second diode D2 and the control module in the energy storage device 50 are both connected to the input end of the first AND gate subunit 1211, and the anode of the second diode D2 and the control module in the energy storage device 50 are also connected to the input end of the second AND gate subunit 1212.

[0071] Among them, the first end of the resistor R4 is connected to the drain of the switch tube Q. The AND gate circuit is a digital logic circuit that follows the "AND" logic relationship. The "AND" logic can be simply understood as the output is "true" only when all input conditions are "true" (usually represented by a high level in a digital circuit); as long as one input condition is "false" (represented by a low level), the output is "false".

[0072] Then, in the embodiment of the present application, the two input ends of the first AND gate subunit 1211 are respectively connected to the control module and the drain of the switch tube Q, and the output end is connected to the first switch tube in the first switch tube group. The two input ends of the second AND gate subunit 1212 are respectively connected to the control module and the drain of the switch tube Q, and the output end is connected to the second switch tube in the first switch tube group.

[0073] Then, during the charging and discharging process of the multiple battery modules 20, when any battery module is unplugged, the switch tube Q is in the on state, and both the input ends of the first AND gate subunit 1211 and the two input ends of the second AND gate subunit 1212 include a low-level signal, then, both the output end of the first AND gate subunit 1211 and the output end of the second AND gate subunit 1212 output low-level signals. In this way, the multiple battery modules 20 stop charging and discharging, which can avoid damage or danger to the energy storage device 50.

[0074] In one embodiment, the first AND gate subunit 1211 includes: a resistor R5, a resistor R6, a resistor R7, a second capacitor C2 and a first AND gate element U1; the first end of the resistor R5 is connected to the input power supply, the second end of the resistor R5 and the positive electrode of the second diode D2 are both connected to the first input end of the first AND gate element U1, the first end of the resistor R6 and the first end of the resistor R7 are both connected to the control module, the second end of the resistor R7 and the first end of the second capacitor C2 are both connected to the second input end of the first AND gate element U1, and the second end of the resistor R6 and the second end of the second capacitor C2 are both grounded.

[0075] The second AND gate subunit 1212 includes a resistor R8, a resistor R9, a resistor R10, a third capacitor C3, a fourth capacitor C4 and a second AND gate element U2; the first end of the resistor R8, the first end of the third capacitor C3 and the positive electrode of the second diode D2 are all connected to the first input end of the second AND gate element U2, and the second ends of the resistor R8 and the third capacitor C3 are grounded; the first end of the resistor R9 and the first end of the resistor R10 are both connected to the control module, the second end of the resistor R9 and the first end of the fourth capacitor C4 are both connected to the second input end of the second AND gate element U2, and the second end of the resistor R10 and the second end of the fourth capacitor C4 are grounded.

[0076] Regarding the second logic protection unit 122, in one embodiment, the second logic protection unit 122 includes a resistor eleven R11, a third diode D3, a third AND gate sub-unit 1221 and a fourth AND gate sub-unit 1222;

[0077] The first end of the resistor R11 is connected to the state identification module 11, the second end of the resistor R11 is connected to the cathode of the third diode D3, the anode of the third diode D3 and the control module in the energy storage device 50 are both connected to the input end of the third AND gate sub-unit 1221, the output end of the third AND gate sub-unit 1221 is connected to the third switch tube in the second switch tube group, the anode of the third diode D3 and the control module in the energy storage device 50 are also connected to the input end of the fourth AND gate sub-unit 1222, and the output end of the fourth AND gate sub-unit 1222 is connected to the fourth switch tube in the second switch tube group.

[0078] Among them, the third AND gate subunit 1221 includes a resistor twelve R12, a resistor thirteen R13, a resistor fourteen R14, a fifth capacitor C5 and a third AND gate element U3; the first end of the resistor twelve R12 is connected to the input power supply, the second end of the resistor twelve R12 and the positive electrode of the third diode D3 are both connected to the first input end of the third AND gate element U3, the first end of the resistor thirteen R13 and the first end of the resistor fourteen R14 are both connected to the control module, the second end of the resistor fourteen R14 and the first end of the fifth capacitor C5 are both connected to the second input end of the third AND gate element U3, and the second end of the resistor thirteen R13 and the second end of the fifth capacitor C5 are both grounded.

[0079] The fourth AND gate subunit 1222 includes a resistor R15, a resistor R16, a resistor R17, a sixth capacitor C6, a seventh capacitor C7 and a fourth AND gate element U4; the first end of the resistor R15, the first end of the sixth capacitor C6 and the positive electrode of the third diode D3 are all connected to the first input end of the fourth AND gate element U4, and the second ends of the resistor R15 and the sixth capacitor C6 are grounded; the first end of the resistor R16 and the first end of the resistor R17 are all connected to the control module, the second end of the resistor R16 and the first end of the seventh capacitor C7 are all connected to the second input end of the fourth AND gate element U4, and the second end of the resistor R17 and the second end of the seventh capacitor C7 are grounded.

[0080] In the embodiment of the present application, during the charging and discharging process of multiple battery modules 20, after at least one battery module is unplugged from the energy storage device 50, the switch tube Q is turned on, and the voltage of the input power supply is completely pulled down, so that the first input ends of the first AND gate element U1, the second AND gate element U2, the third AND gate element U3 and the fourth AND gate element U4 are all low-level signals. Then, the output ends of the first AND gate element U1, the second AND gate element U2, the third AND gate element U3 and the fourth AND gate element U4 are all low-level signals. Correspondingly, multiple power modules stop charging and discharging.

[0081] Among them, the first AND gate element U1, the second AND gate element U2, the third AND gate element U3 and the fourth AND gate element U4 can be a (Transistor-Transistor Logic, TTL) AND gate circuit constructed based on bipolar transistors (triodes), a (Complementary Metal-Oxide-Semiconductor, CMOS) AND gate circuit composed of complementary metal oxide semiconductor field effect transistors, and an (Emitter-Coupled Logic, ECL) AND gate circuit based on emitter coupled logic. The voltage of the input power supply can be 5V, of course, it can also be 3V, 8V, etc.

[0082] The above-mentioned logic protection module 12 includes a first logic protection unit 121 and a second logic protection unit 122. The first ends of the first logic protection unit 121 and the second logic protection unit 122 are connected to the state identification module 11, the second end of the first logic protection unit 121 is connected to the first switch tube group in the inverter module 30, and the second end of the second logic protection unit 122 is connected to the second switch tube group in the inverter module 30; during the charging and discharging process of multiple battery modules 20, when any one of the multiple battery modules 20 is unplugged from the energy storage device 50, the first logic protection unit 121 and the second logic protection unit 122 both output low-level signals. In the process of designing the logic protection module 12, taking into account the four switch tubes in the inverter module 30, two groups of logic protection units including four AND gate elements are designed. In this way, when multiple battery modules 20 are charged and discharged, after at least one battery module is unplugged from the energy storage device 50, the switch tube Q is turned on, and the voltage of the input power supply is all pulled down, so that the first input ends of the four AND gate elements are all low-level signals, and correspondingly, the output ends of the four AND gate elements are all low-level signals, and multiple power modules stop charging and discharging, which can avoid damage to the energy storage device 50 or danger.

[0083] In one embodiment, an energy storage device 50 is also provided, which includes multiple battery modules 20, an inverter module 30, a control module and a charge and discharge protection circuit 10, wherein the inverter module 30, the control module and the charge and discharge protection circuit 10 are all arranged in the host.

[0084] The above content is a further detailed description of the embodiments of the present application in combination with specific / preferred implementation methods, and it cannot be determined that the specific implementation of the embodiments of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the embodiments of the present application belong, without departing from the concept of the embodiments of the present application, it can also make several substitutions or modifications to these described implementation methods, and these substitutions or modifications should be regarded as belonging to the protection scope of the embodiments of the present application. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered as the scope recorded in this specification.

[0085] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0086] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A charge and discharge protection circuit, characterized in that: The charge and discharge protection circuit comprises: a state recognition module and a logic protection module, wherein the first end of the state recognition module is respectively connected to a plurality of battery modules, and the second end of the state recognition module is connected to the inverter module through the logic protection module; The state identification module is used to identify whether the multiple battery modules are unplugged from the energy storage device during the charging and discharging process of the multiple battery modules; The logic protection module is used to output a low level signal when any one of the multiple battery modules is unplugged from the energy storage device.

2. The circuit according to claim 1, characterized in that The state identification module comprises: a plurality of voltage detection units and a switch unit, wherein the first end of each voltage detection unit is connected to the corresponding battery module, the second end of the plurality of voltage detection units is connected to the first end of the switch unit, and the second end of the switch unit is connected to the logic protection module; The multiple voltage detection units are used to detect whether the corresponding battery modules exist; The switch unit is configured to be in a disconnected state when all of the plurality of battery modules are present, and to be switched to a conductive state when at least one battery module is not present.

3. The circuit according to claim 2, characterized in that The switch unit includes a switch tube, a resistor 1 and a resistor 2, the first end of the resistor 1 is connected to the multiple voltage detection units respectively, the second end of the resistor 1 is connected to the first end of the resistor 2 and the gate of the switch tube, the drain of the switch tube is connected to the logic protection module, and the source of the switch tube and the second end of the resistor 2 are both grounded.

4. The circuit according to claim 2, characterized in that Each voltage detection unit includes a resistor three, a first capacitor and a first diode. The first end of the resistor three is connected to the power supply, the second end of the resistor three and the first end of the first capacitor are both connected to the corresponding battery module, the second end of the first capacitor is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the switch unit.

5. The circuit according to any one of claims 1 to 4, characterized in that: The logic protection module includes a first logic protection unit and a second logic protection unit, wherein the first ends of the first logic protection unit and the second logic protection unit are connected to the state identification module, the second end of the first logic protection unit is connected to the first switch tube group in the inverter module, and the second end of the second logic protection unit is connected to the second switch tube group in the inverter module; During the charging and discharging process of the multiple battery modules, when any one of the multiple battery modules is unplugged from the energy storage device, both the first logic protection unit and the second logic protection unit output a low level signal.

6. The circuit according to claim 5, characterized in that The first logic protection unit includes a resistor four, a second diode, a first AND gate sub-unit and a second AND gate sub-unit; The first end of the resistor four is connected to the state identification module, the second end of the resistor four is connected to the cathode of the second diode, the anode of the second diode and the control module in the energy storage device are both connected to the input end of the first AND gate sub-unit, the output end of the first AND gate sub-unit is connected to the first switch tube in the first switch tube group, the anode of the second diode and the control module in the energy storage device are also connected to the input end of the second AND gate sub-unit, and the output end of the second AND gate sub-unit is connected to the second switch tube in the first switch tube group.

7. The circuit according to claim 6, characterized in that The first AND gate subunit includes: resistor five, resistor six, resistor seven, a second capacitor and a first AND gate element; The first end of the resistor five is connected to the input power supply, the second end of the resistor five and the positive electrode of the second diode are both connected to the first input end of the first AND gate element, the first end of the resistor six and the first end of the resistor seven are both connected to the control module, the second end of the resistor seven and the first end of the second capacitor are both connected to the second input end of the first AND gate element, and the second end of the resistor six and the second end of the second capacitor are both grounded.

8. The circuit according to claim 6, characterized in that The second AND gate subunit includes resistor eight, resistor nine, resistor ten, a third capacitor, a fourth capacitor and a second AND gate element; The first end of the resistor eight, the first end of the third capacitor, and the anode of the second diode are all connected to the first input end of the second AND gate element, and the second ends of the resistor eight and the third capacitor are grounded; The first end of the resistor nine and the first end of the resistor ten are both connected to the control module, the second end of the resistor nine and the first end of the fourth capacitor are both connected to the second input end of the second AND gate element, and the second end of the resistor ten and the second end of the fourth capacitor are grounded.

9. The circuit according to claim 5, characterized in that The second logic protection unit includes a resistor eleven, a third diode, a third AND gate sub-unit and a fourth AND gate sub-unit; The first end of the resistor 11 is connected to the state identification module, the second end of the resistor 11 is connected to the cathode of the third diode, the anode of the third diode and the control module in the energy storage device are both connected to the input end of the third AND gate sub-unit, the output end of the third AND gate sub-unit is connected to the third switch tube in the second switch tube group, the anode of the third diode and the control module in the energy storage device are also connected to the input end of the fourth AND gate sub-unit, and the output end of the fourth AND gate sub-unit is connected to the fourth switch tube in the second switch tube group.

10. An energy storage device, characterized in that: The energy storage device includes multiple battery modules, an inverter module, a control module and a charge and discharge protection circuit as described in any one of claims 1-9.

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