Battery protection device and method, optical storage inverter, energy storage all-in-one machine and system

Abstract

The invention discloses a battery protection device and method, an optical storage inverter, and an energy storage all-in-one machine and system, and relates to the technical field of battery protection, and the device comprises a battery voltage collection module which is connected with a target battery and is used for collecting a battery voltage signal of the target battery and outputting the battery voltage signal to a battery detection module and a main control module; the battery detection module is connected with the battery voltage acquisition module and is used for generating a level signal according to the battery voltage signal and a preset conventional voltage signal threshold value and outputting the level signal to the main control module; and a main control module which is connected with the battery voltage acquisition module and the battery detection module and is used for generating a battery protection signal according to the battery voltage signal and a preset positive connection voltage signal threshold value when the level signal is detected to be a low level signal so as to protect the target battery. The battery protection signal comprises a battery reverse connection protection signal or a battery overvoltage protection signal. The invention aims to consider the battery voltage sampling precision and the battery protection cost at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of battery protection, and particularly relates to a battery protection device, method, photovoltaic energy storage inverter, energy storage integrated machine and system. Background Art

[0002] If the problem of battery reverse connection occurs in a battery, it will cause damage to the device connected to the battery; if the problem of battery overvoltage occurs, it will cause damage to the battery. At present, the following two methods are usually adopted to solve the problems of battery reverse connection and battery overvoltage existing in the battery:

[0003] One method is to add a bias voltage to the voltage sampling circuit in the battery overvoltage protection circuit, so as to detect and protect the battery reverse connection through the added bias voltage on the basis of realizing battery overvoltage protection. However, this method of adding a bias voltage will increase the range of battery voltage to be sampled, thus affecting the sampling accuracy of the battery voltage. Another method is to set two protection circuits to realize battery overvoltage protection and battery reverse connection protection respectively. Although this method can ensure the sampling accuracy of the battery voltage, it increases the circuit complexity and thus increases the cost.

[0004] Therefore, how to balance the battery voltage sampling accuracy and the battery protection cost is an urgent problem to be solved at present. Summary of the Invention

[0005] The main purpose of the present application is to provide a battery protection device, aiming to balance the battery voltage sampling accuracy and the battery protection cost.

[0006] To achieve the above purpose, the present application provides a battery protection device, which includes a battery voltage acquisition module, a battery detection module and a main control module;

[0007] The battery voltage acquisition module is respectively connected to the target battery, the battery detection module and the main control module, and the battery detection module is connected to the main control module;

[0008] The battery voltage acquisition module is used to acquire the battery voltage signal of the target battery and output the battery voltage signal to the battery detection module and the main control module;

[0009] The battery detection module is used to generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold, and output the level signal to the main control module;

[0010] The master control module is configured to generate a battery protection signal based on the battery voltage signal and a preset positive connection voltage signal threshold to protect the target battery when detecting that the level signal is a low-level signal, where the battery protection signal includes a battery reverse connection protection signal or a battery overvoltage protection signal.

[0011] Optionally, the level signal includes a high-level signal and a low-level signal, and the battery detection module is configured to:

[0012] generate the low-level signal if the battery voltage signal is greater than the preset normal voltage signal threshold;

[0013] if the battery voltage signal is less than or equal to the preset normal voltage signal threshold, determine whether the battery voltage signal is less than a preset positive voltage signal threshold, where the preset positive voltage signal threshold is less than the preset normal voltage signal threshold;

[0014] generate the low-level signal if the battery voltage signal is less than the preset positive voltage signal threshold;

[0015] generate the high-level signal if the battery voltage signal is greater than or equal to the preset positive voltage signal threshold.

[0016] Optionally, the master control module is configured to:

[0017] when detecting that the level signal is a low-level signal, determine whether the battery voltage signal is less than the preset positive connection voltage signal threshold;

[0018] if so, generate the battery reverse connection protection signal to protect the target battery against reverse connection;

[0019] if not, generate the battery overvoltage protection signal to protect the target battery against overvoltage.

[0020] Optionally, the battery voltage acquisition module includes a differential circuit and an operational amplifier;

[0021] The positive and negative electrodes of the target battery are respectively connected to two input terminals of the differential circuit, the output terminal of the differential circuit is connected to the input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the input terminal of the battery detection module and the input terminal of the master control module;

[0022] The differential circuit is configured to determine a voltage acquisition ratio according to the resistance values of internal resistors;

[0023] The operational amplifier is configured to acquire the battery voltage signal of the target battery according to the voltage acquisition ratio.

[0024] Optionally, the battery detection module includes a comparator;

[0025] The positive input terminal of the comparator is connected to the preset conventional voltage signal threshold, the negative input terminal of the comparator is connected to the output terminal of the battery voltage acquisition module, and the output terminal of the comparator is connected to the input terminal of the main control module;

[0026] The comparator is configured to generate a level signal according to the battery voltage signal and the preset conventional voltage signal threshold, and output the level signal to the main control module.

[0027] Optionally, the battery detection module further includes a hysteresis circuit;

[0028] The hysteresis circuit is respectively connected to the positive input terminal and the output terminal of the comparator;

[0029] The hysteresis circuit is used to stabilize the level signal generated by the comparator.

[0030] Optionally, the main control module includes a clamping diode and a main control chip;

[0031] One end of the clamping diode is connected to the output terminal of the battery voltage acquisition module, the other end of the clamping diode is connected to the first input terminal of the main control chip, and the second input terminal of the main control chip is connected to the output terminal of the battery detection module;

[0032] The clamping diode is configured to perform a clamping process on the battery voltage signal to obtain a voltage clamping signal;

[0033] The main control chip is configured to generate a battery protection signal according to the voltage clamping signal and the preset positive connection voltage signal threshold in the case where the level signal is detected as a low level signal, so as to protect the target battery.

[0034] Optionally, the battery protection device further includes a current limiting module;

[0035] The current limiting module is respectively connected to the battery voltage acquisition module and the main control module;

[0036] The current limiting module is used to limit the magnitude of the current signal output from the battery voltage acquisition module to the main control module.

[0037] To achieve the above object, the present application further provides a battery protection method, which is applied to the above battery protection device, and the battery protection method includes:

[0038] Obtain the battery voltage signal of the target battery connected to the battery protection device;

[0039] Generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold value.

[0040] If it is detected that the level signal is a low-level signal, generate a battery protection signal according to the battery voltage signal and a preset positive connection voltage signal threshold value to protect the target battery, where the battery protection signal includes a battery reverse connection protection signal or a battery overvoltage protection signal.

[0041] To achieve the above object, the present application further provides a photovoltaic energy storage inverter, and the photovoltaic energy storage inverter includes the above battery protection device; the battery protection device is connected to the target battery, and the battery protection device is used to protect the target battery. For the specific description of the battery protection device, refer to the above, and details are not described herein again.

[0042] To achieve the above object, the present application further provides an energy storage integrated machine, and the energy storage integrated machine includes a photovoltaic energy storage inverter and a target battery; the photovoltaic energy storage inverter includes the above battery protection device; the battery protection device is connected to the target battery; the battery protection device is used to protect the target battery. For the specific description of the battery protection device, refer to the above, and details are not described herein again.

[0043] To achieve the above object, the present application further provides an energy storage system, and the energy storage system includes a photovoltaic module, a photovoltaic energy storage inverter and a target battery. The photovoltaic energy storage inverter includes the above battery protection device; the photovoltaic energy storage inverter is connected to the photovoltaic module, and the battery protection device is connected to the target battery; the battery protection device is used to protect the target battery. For the specific description of the battery protection device, refer to the above, and details are not described herein again.

[0044] To achieve the above object, the present application further provides a readable storage medium, and the readable storage medium is a computer-readable storage medium. A program for implementing the battery protection method is stored on the computer-readable storage medium, and the program for implementing the battery protection method is executed by a processor to implement the steps of the battery protection method as described above.

[0045] The present application provides a battery protection device, which includes a battery voltage acquisition module connected to a target battery, a battery detection module connected to the battery voltage acquisition module, and a main control module respectively connected to the battery voltage acquisition module and the battery detection module. The present application collects the battery voltage signal of the target battery through the battery voltage acquisition module, and outputs the battery voltage signal to the battery detection module and the main control module for further processing; after receiving the battery voltage signal, the battery detection module can generate a level signal for indicating whether it is necessary to protect the target battery according to the battery voltage signal and a preset conventional voltage signal threshold, and output the level signal to the main control module; if the main control module detects that the level signal is a low-level signal, it means that it is necessary to protect the target battery. To determine whether it is necessary to perform battery reverse connection protection or battery overvoltage protection on the target battery specifically, the main control module needs to generate a battery protection signal according to the received battery voltage signal and a preset positive connection voltage signal threshold, so as to perform corresponding protection on the target battery through the battery protection signal.

[0046] In summary, since the present application does not achieve battery reverse connection protection on the basis of achieving battery overvoltage protection by increasing the bias voltage, but realizes battery reverse connection protection and battery overvoltage protection for the target battery through the collected battery voltage signal of the target battery and the level signal generated according to the battery voltage signal, it is not necessary to increase the bias voltage on the battery voltage acquisition module, thus avoiding the problem of affecting the battery voltage sampling accuracy caused by increasing the bias voltage and ensuring the sampling accuracy of the battery voltage. In addition, since the control processes among the battery voltage acquisition module, the battery detection module, and the main control module in the battery protection device of the present application are interrelated with each other, they belong to the same control line, that is, the same protection line, so the problem of increased cost caused by setting multiple protection lines can be avoided, and the cost of battery protection is reduced. Therefore, the present application can reduce the cost of battery protection on the basis of ensuring the sampling accuracy of the battery voltage. Brief Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0048] Figure 1 It is a functional block diagram of an existing battery protection device with an increased bias voltage;

[0049] Figure 2 It is a functional block diagram of an existing battery protection device adopting two protection lines;

[0050] Figure 3 It is a functional block diagram of the first embodiment of the battery protection device of the present application;

[0051] Figure 4 It is a functional block diagram of the second embodiment in which the battery voltage acquisition module in the battery protection device of the present application includes a differential circuit and an operational amplifier;

[0052] Figure 5 It is a functional block diagram of the third embodiment in which the battery detection module in the battery protection device of the present application includes a comparator;

[0053] Figure 6 It is a functional block diagram of the third embodiment in which the battery detection module in the battery protection device of the present application includes a comparator and a hysteresis circuit;

[0054] Figure 7 It is a functional block diagram of the fourth embodiment in which the main control module in the battery protection device of the present application includes a clamping diode and a main control chip;

[0055] Figure 8 It is a functional block diagram of the fifth embodiment in which the battery protection device of the present application further includes a current limiting module;

[0056] Figure 9 It is a schematic diagram of the circuit structure of the battery protection device of the present application;

[0057] Figure 10 It is the internal schematic diagram of the comparator of the present application;

[0058] Figure 11 It is a schematic diagram of the flow of the battery protection method of the present application.

[0059] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0060] Explanation of the reference numerals in the drawings:

[0061] Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0063] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0064] In addition, the descriptions involving "first", "second", etc. in this application are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0065] The main function of the photovoltaic energy storage inverter is to convert direct current into alternating current.

[0066] If the battery has the problem of reverse battery connection, it will cause damage to the device connected to the battery; if there is a problem of overvoltage of the battery, it will cause damage to the battery. Currently, the following two methods are usually used to solve the problems of reverse battery connection and overvoltage of the battery existing in the battery:

[0067] One method is to add a bias voltage to the voltage sampling circuit in the overvoltage protection circuit of the battery, so as to detect and protect the reverse battery connection through the added bias voltage on the basis of realizing the overvoltage protection of the battery. However, this method of adding a bias voltage will increase the range of the battery voltage to be sampled, thus affecting the sampling accuracy of the battery voltage. Specifically, refer to Figure 1 ,"Target battery -> Battery voltage acquisition module -> Battery overvoltage detection module" constitutes the battery overvoltage protection circuit, and "Target battery -> Battery voltage acquisition module" is the voltage sampling circuit in the battery overvoltage protection circuit.

[0068] Another method is to set two protection circuits to respectively realize the overvoltage protection and reverse battery connection protection of the battery. Although this method can ensure the sampling accuracy of the battery voltage, it increases the circuit complexity and thus increases the cost. Specifically, refer to Figure 2 ,"Target battery -> Battery voltage acquisition module -> Battery overvoltage detection module" constitutes the battery overvoltage protection circuit, and "Target battery -> Battery voltage acquisition module -> Reverse battery connection detection module" constitutes the reverse battery connection protection circuit.

[0069] Therefore, how to balance the battery voltage sampling accuracy and the battery protection cost at the same time is an urgent problem to be solved at present.

[0070] Based on this, the present application proposes a battery protection device. In the first embodiment of the present application, please refer to Figure 3 , the battery protection device includes a battery voltage acquisition module 10, a battery detection module 20, and a main control module 30; a first input end of the battery voltage acquisition module 10 is connected to the positive electrode of the target battery 100, a second input end of the battery voltage acquisition module 10 is connected to the negative electrode of the target battery 100, an output end of the battery voltage acquisition module 10 is connected to an input end of the battery detection module 20 and a first input end of the main control module 30, and an output end of the battery detection module 20 is connected to a second input end of the main control module 30; the battery voltage acquisition module 10 is configured to acquire a battery voltage signal of the target battery 100 and output the battery voltage signal to the battery detection module 20 and the main control module 30; the battery detection module 20 is configured to generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold and output the level signal to the main control module 30; the main control module 30 is configured to generate a battery protection signal according to the battery voltage signal and a preset positive connection voltage signal threshold in a case where the level signal is detected as a low level signal, so as to protect the target battery, wherein the battery protection signal includes a battery reverse connection protection signal or a battery overvoltage protection signal.

[0071] It should be noted that the target battery 100 refers to a battery with positive and negative electrodes, and the battery voltage signal is used to represent the voltage value of the acquired target battery 100 at the current moment; the preset conventional voltage signal threshold refers to the maximum voltage value that the target battery 100 can reach when there is no battery overvoltage problem; the level signal is used to indicate whether the target battery 100 needs to be protected, and the level signal includes a high level signal and a low level signal. The high level signal is used to indicate that the target battery 100 does not need to be protected, and the low level signal is used to indicate that the target battery 100 needs to be protected; the preset positive connection voltage signal threshold refers to the minimum voltage value that the target battery 100 can reach when it is in a positive connection; the battery protection signal is used to protect the target battery 100, and the battery protection signal may include a battery reverse connection protection signal or a battery overvoltage protection signal. The battery reverse connection protection signal is used to protect the target battery 100 against reverse connection, and the battery overvoltage protection signal is used to protect the target battery 100 against overvoltage.

[0072] In a feasible implementation, when generating a level signal according to the battery voltage signal and the preset conventional voltage signal threshold, if the battery voltage signal is greater than the preset conventional voltage signal threshold, it indicates that the voltage value of the target battery 100 at the current moment has exceeded the maximum voltage value that the target battery 100 can reach when there is no battery overvoltage problem. Therefore, it is necessary to protect the target battery 100, and a low-level signal for indicating that the target battery 100 needs to be protected is generated; if the battery voltage signal is less than or equal to the preset conventional voltage signal threshold, it indicates that the voltage value of the target battery 100 at the current moment does not exceed the maximum voltage value that the target battery 100 can reach when there is no battery overvoltage problem. Then, it is necessary to further determine whether the battery voltage signal is less than the preset positive voltage signal threshold, that is, to determine whether the battery voltage signal is less than the minimum supply voltage value of the comparator U2 in the battery detection module 20. If the battery voltage signal is less than the minimum supply voltage value of the comparator U2 in the battery detection module 20, it indicates that the target battery 100 may have a problem of battery reverse connection at the current moment. Therefore, it is necessary to protect the target battery 100, and a low-level signal for indicating that the target battery 100 needs to be protected is generated; if the battery voltage signal is greater than or equal to the minimum supply voltage value of the comparator U2 in the battery detection module 20, it indicates that the target battery 100 has neither a battery overvoltage problem nor a battery reverse connection problem. Therefore, there is no need to protect the target battery 100, and a high-level signal for indicating that the target battery 100 does not need to be protected is generated.

[0073] In a feasible implementation, in the case where the level signal is detected to be a low-level signal, it is necessary to further determine whether the battery voltage signal is less than the preset positive connection voltage signal threshold to determine whether the problem existing in the target battery 100 is a battery reverse connection problem or a battery overvoltage problem. If the battery voltage signal is less than the preset positive connection voltage signal threshold, it indicates that the voltage value of the target battery 100 at the current moment has not reached the minimum voltage value that the target battery 100 can reach when it is in the positive connection state. Therefore, it can be determined that the problem existing in the target battery 100 is a battery reverse connection problem, and a battery reverse connection protection signal for performing reverse connection protection on the target battery 100 is generated; if the battery voltage signal is greater than or equal to the preset positive connection voltage signal threshold, it indicates that the problem existing in the target battery 100 is not a battery reverse connection problem, but a battery overvoltage problem, and a battery overvoltage protection signal for performing overvoltage protection on the target battery 100 is generated.

[0074] This embodiment provides a battery protection device, which includes a battery voltage acquisition module connected to a target battery, a battery detection module connected to the battery voltage acquisition module, and a main control module connected to the battery voltage acquisition module and the battery detection module respectively. In this embodiment, the battery voltage acquisition module acquires the battery voltage signal of the target battery to output the battery voltage signal to the battery detection module and the main control module for further processing; after receiving the battery voltage signal, the battery detection module can generate a level signal for indicating whether it is necessary to protect the target battery according to the battery voltage signal and a preset conventional voltage signal threshold, and output the level signal to the main control module; if the main control module detects that the level signal is a low-level signal, it indicates that it is necessary to protect the target battery. To determine whether it is necessary to perform battery reverse connection protection or battery overvoltage protection on the target battery specifically, the main control module needs to generate a battery protection signal according to the received battery voltage signal and a preset positive connection voltage signal threshold to perform corresponding protection on the target battery through the battery protection signal.

[0075] In summary, since this embodiment does not achieve battery reverse connection protection on the basis of achieving battery overvoltage protection by increasing a bias voltage, but realizes battery reverse connection protection and battery overvoltage protection for the target battery through the acquired battery voltage signal of the target battery and the level signal generated according to the battery voltage signal, there is no need to increase a bias voltage on the battery voltage acquisition module, thus avoiding the problem of affecting the battery voltage sampling accuracy caused by increasing the bias voltage and ensuring the sampling accuracy of the battery voltage. In addition, since the control processes among the battery voltage acquisition module, the battery detection module, and the main control module in the battery protection device of this embodiment are interrelated with each other, they belong to the same control line, that is, the same protection line, so the problem of increased cost caused by setting multiple protection lines can be avoided, and the cost of battery protection is reduced. Therefore, this embodiment can reduce the cost of battery protection on the basis of ensuring the sampling accuracy of the battery voltage.

[0076] Based on the above first embodiment, the second embodiment of the battery protection device of the present application is proposed. In the second embodiment of the present application, please refer to Figure 4, the battery voltage acquisition module 10 may include a differential circuit 11 and an operational amplifier U1; the positive electrode of the target battery 100 is connected to the first input end of the differential circuit 11, the negative electrode of the target battery 100 is connected to the second input end of the differential circuit 11, the first output end of the differential circuit 11 is connected to the positive input end of the operational amplifier U1, the second output end of the differential circuit 11 is connected to the negative input end of the operational amplifier U1, the first end of the operational amplifier U1 is connected to the +12V power supply, the second end of the operational amplifier U1 is connected to the -12V power supply, and the output end of the operational amplifier U1 is connected to the input end of the battery detection module 20 and the first input end of the main control module 30; the differential circuit 11 is used to determine the voltage acquisition ratio according to the resistance values of the internal resistors; the operational amplifier U1 is used to collect the battery voltage signal of the target battery 100 according to the voltage acquisition ratio.

[0077] It should be noted that the voltage acquisition ratio is used to limit the voltage value of the battery voltage signal collected by the operational amplifier U1 from the target battery 100. It can be understood that since the actual voltage value of the target battery 100 is usually relatively large (up to several hundred volts), while the operational amplifier U1 usually operates within a relatively small voltage range (for example, -3.3V to 3.3V), directly collecting the actual voltage value of the target battery 100 will affect the normal operation of the operational amplifier U1.

[0078] Exemplarily, assume that the voltage value corresponding to the actual voltage signal of the target battery 100 is 100V, and the voltage acquisition ratio is 1 / 100, then the voltage value corresponding to the collected battery voltage signal of the target battery 100 is 100V × 1 / 100 = 1V.

[0079] In this embodiment, by setting the differential circuit 11 to limit the voltage value of the battery voltage signal collected by the operational amplifier U1 from the target battery 100, it is avoided that the normal operation of the operational amplifier U1 is affected due to the voltage value of the collected battery voltage signal exceeding the working voltage range of the operational amplifier U1, ensuring the normal operation of the operational amplifier U1.

[0080] Based on the above first and / or second embodiments, a third embodiment of the battery protection device of the present application is proposed. In the third embodiment of the present application, please refer to Figure 5 , the battery detection module 20 includes a comparator U2; the positive input end of the comparator U2 is connected to a preset conventional voltage signal threshold Vref1, the negative input end of the comparator U2 is connected to the output end of the battery voltage acquisition module 10, the first end of the comparator U2 is connected to the analog ground AGND, the second end of the comparator U2 is connected to the +12V power supply, and the output end of the comparator U2 is connected to the second input end of the main control module 30; the comparator U2 is used to generate a battery protection signal according to the battery voltage signal and the preset conventional voltage signal threshold Vref1.

[0081] It should be noted that the minimum supply voltage value of the comparator U2 is AGND, that is, the preset positive voltage signal threshold is AGND.

[0082] Furthermore, please refer to Figure 6 , the battery detection module 20 may further include a hysteresis circuit 21; one end of the hysteresis circuit 21 is connected to the positive input terminal of the comparator U2, and the other end of the hysteresis circuit 21 is connected to the output terminal of the comparator U2; the hysteresis circuit 21 is used to stabilize the level signal generated by the comparator U2.

[0083] In this embodiment, by setting the comparator U2 to compare the battery voltage signal with the preset conventional voltage signal threshold Vref1 to generate a level signal for indicating whether the target battery 100 needs to be protected; and further setting the hysteresis circuit 21 to stabilize the level signal generated by the comparator U2, avoiding the problem that the accuracy of battery protection is affected by the unstable level signal output by the comparator U2, so as to ensure the accuracy of battery protection by stabilizing the level signal generated by the comparator U2.

[0084] Based on the above first, second, and / or third embodiments, a fourth embodiment of the battery protection device of the present application is proposed. In the fourth embodiment of the present application, please refer to Figure 7 , the main control module 30 includes a clamping diode B1 and a main control chip M1; the anode of the clamping diode B1 is connected to the output terminal of the battery voltage acquisition module 10, the cathode of the clamping diode B1 is connected to the first input terminal of the main control chip M1, and the second input terminal of the main control chip M1 is connected to the output terminal of the battery detection module 20; the clamping diode B1 is used to perform clamping processing on the battery voltage signal to obtain a voltage clamping signal; the main control chip M1 is used to generate a battery protection signal according to the voltage clamping signal and the preset positive connection voltage signal threshold in the case where the detection level signal is a low level signal to protect the target battery.

[0085] It should be noted that the voltage clamping signal refers to the battery voltage signal after clamping processing. The main control chip M1 can be a chip with control capabilities such as an FPGA (Field-Programmable Gate Array) chip, an STM32 chip, an STM51 chip, an ARM (Advanced RISC Machines) chip, etc. The present embodiment does not specifically limit the main control chip M1.

[0086] In a feasible implementation manner, in the case where the level signal is detected as a low-level signal, if the voltage clamping signal is less than the preset positive connection voltage signal threshold, a battery reverse connection protection signal for reverse connection protection of the target battery 100 is generated; if the voltage clamping signal is greater than or equal to the preset positive connection voltage signal threshold, a battery overvoltage protection signal for overvoltage protection of the target battery 100 is generated.

[0087] In this embodiment, the clamping diode B1 is set to clamp the battery voltage signal that the battery voltage acquisition module 10 needs to output to the main control chip M1, so as to limit the voltage value of the battery voltage signal received by the main control chip M1, and avoid the situation that the main control chip M1 receives a signal with an excessive voltage value, which may cause the main control chip M1 to be open-circuited, resulting in damage to the main control chip M1, and further affecting the operation safety of the entire battery protection device. Therefore, in this embodiment, the clamping diode B1 is set to ensure the operation safety of the battery protection device.

[0088] Based on the above first, second, third, and / or fourth embodiments, the fifth embodiment of the battery protection device of the present application is proposed. In the fifth embodiment of the present application, please refer to Figure 8 , the battery protection device may further include a current limiting module 40; the input end of the current limiting module 40 is connected to the output end of the battery voltage acquisition module 10. The output end of the current limiting module 40 is connected to the first input end of the main control module 30; the current limiting module 40 is used to limit the magnitude of the current signal output from the battery voltage acquisition module 10 to the main control module 30.

[0089] In this embodiment, by setting a current limiting module 40 for limiting the magnitude of the current signal between the battery voltage acquisition module 10 and the main control module 30, it is possible to avoid the situation that the main control module 30 is short-circuited due to the battery voltage acquisition module 10 outputting an excessive current signal to the main control module 30, resulting in damage to the main control module 30, and further affecting the operation safety of the entire battery protection device. Therefore, in this embodiment, the current limiting module 40 is used to ensure the operation safety of the battery protection device.

[0090] Exemplarily, please refer to Figure 9, in the above embodiments, the differential circuit 11 in the battery voltage acquisition module 10, the hysteresis circuit 21 in the battery detection module 20, and the current limiting module 40 can all be set according to actual situations. For example, the differential circuit 11 may include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, and a second capacitor C2; one end of the first resistor R1 is connected to the positive electrode of the target battery 100, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the first capacitor C1, one end of the first capacitor C1 is connected to one end of the fifth resistor R5, one end of the fifth resistor R5 is connected to the positive input terminal of the operational amplifier U1, and the other end of the first capacitor C1 and the other end of the fifth resistor R5 are connected to the analog ground AGND; one end of the sixth resistor R6 is connected to the negative electrode of the target battery 100, and the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the negative input terminal of the operational amplifier U1, one end of the tenth resistor R10, and one end of the second capacitor C2, and the other end of the tenth resistor R10 and the other end of the second capacitor C2 are connected to the output terminal of the operational amplifier U1.

[0091] Further, the above-mentioned hysteresis circuit 21 may include an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a third capacitor C3. On this basis, the above-mentioned battery detection module 20 may further include a sixteenth resistor R16, a seventeenth resistor R17, and a fifth capacitor C5; one end of the eleventh resistor R11 is connected to a preset conventional voltage signal threshold Vref1, the other end of the eleventh resistor R12 is connected to one end of the third capacitor C3, one end of the third capacitor C3 is connected to one end of the twelfth resistor R12, one end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13, the other end of the third capacitor C3 and the other end of the twelfth resistor R12 are connected to the analog ground AGND, the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14 and the positive input terminal of the comparator U2, the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15 and the output terminal of the comparator U2, and the other end of the fifteenth resistor R15 is connected to the +3.3V power supply; one end of the sixteenth resistor R16 is connected to the output terminal of the operational amplifier U1, the other end of the sixteenth resistor R16 is connected to one end of the fourth capacitor C4 and the negative input terminal of the comparator U1, the other end of the fourth capacitor C4 is connected to the analog ground AGND, the first terminal of the comparator U2 is connected to the analog ground AGND, the second terminal of the comparator U2 is connected to the +12V power supply, the output terminal of the comparator U2 is connected to one end of the seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to one end of the fifth capacitor C5 and the second input terminal of the main control module 30, and the other end of the fifth capacitor C5 is connected to the digital ground DGND.

[0092] Further, the above-mentioned current limiting module 40 may include an eighteenth resistor R18; one end of the eighteenth resistor R18 is connected to the output terminal of the operational amplifier U1, and the other end of the eighteenth resistor R18 is connected to the first input terminal of the main control module 30.

[0093] The above examples are only for assisting in understanding the present application and do not constitute a limitation on the battery protection device of the present application. Based on this technical concept, more forms of simple transformation are within the protection scope of the present application.

[0094] Exemplarily, to facilitate understanding the operating principle of the above-mentioned comparator U2, please refer to Figure 10 , Figure 10 which shows the internal schematic diagram of the comparator U2.

[0095] When the target battery 100 is connected in the forward direction, if the battery voltage signal received by the negative input terminal -Input of the comparator U2 is greater than the preset conventional voltage signal threshold Vref1 connected to the positive input terminal +Input of the comparator U2, the current I2 will be less than the current I1, resulting in the base voltage of the switching transistor Q7 being not greater than the collector voltage. The switching transistor Q7 will be turned off, and then the switching transistor Q8 will be turned on, so that the output terminal Output of the comparator U2 is grounded, thereby outputting a low-level signal.

[0096] When the target battery 100 is connected in the reverse direction, after the battery voltage signal is received by the negative input terminal -Input of the comparator U2, since the battery voltage signal is less than the preset positive voltage signal threshold, the collector of the switching transistor Q4 will be reverse-biased, and the switching transistor Q4 will not be able to operate in the amplification region, resulting in the current I2 being less than the current I1. Thus, the base voltage of the switching transistor Q7 is not greater than the collector voltage, the switching transistor Q7 will be turned off, and then the switching transistor Q8 will be turned on, so that the output terminal Output of the comparator U2 is grounded, thereby outputting a low-level signal.

[0097] The above examples are only used to assist in understanding the present application and do not constitute a limitation on the battery protection device of the present application. Based on this technical concept, more forms of simple transformations are within the protection scope of the present application.

[0098] The present application also provides a battery protection method applied to the above battery protection device. Please refer to Figure 11 and in combination with Figures 1 to 10 The battery protection method includes steps S10 to S30:

[0099] Step S10: Obtain the battery voltage signal of the target battery connected to the battery protection device;

[0100] Step S20: Generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold;

[0101] In a feasible implementation manner, the level signal includes a high-level signal and a low-level signal. Step S20 may include: if the battery voltage signal is greater than the preset conventional voltage signal threshold, generate the low-level signal; if the battery voltage signal is less than or equal to the preset conventional voltage signal threshold, determine whether the battery voltage signal is less than a preset positive voltage signal threshold, where the preset positive voltage signal threshold is less than the preset conventional voltage signal threshold; if the battery voltage signal is less than the preset positive voltage signal threshold, generate the low-level signal; if the battery voltage signal is greater than or equal to the preset positive voltage signal threshold, generate the high-level signal.

[0102] Step S30: If the detected level signal is a low-level signal, generate a battery protection signal based on the battery voltage signal and a preset positive connection voltage signal threshold to protect the target battery, where the battery protection signal includes a battery reverse connection protection signal or a battery overvoltage protection signal.

[0103] In a feasible implementation, step S30 may include: when it is detected that the level signal is a low-level signal, determine whether the battery voltage signal is less than the preset positive connection voltage signal threshold; if so, generate the battery reverse connection protection signal to perform reverse connection protection on the target battery; if not, generate the battery overvoltage protection signal to perform overvoltage protection on the target battery.

[0104] This embodiment provides a battery protection method. In this embodiment, the battery voltage signal of the target battery connected to the battery protection device is obtained, and based on this battery voltage signal and a preset conventional voltage signal threshold, a level signal for indicating whether the target battery needs to be protected is generated. If it is detected that this level signal is a low-level signal, it indicates that the target battery needs to be protected. To determine whether it is specifically necessary to perform battery reverse connection protection or battery overvoltage protection on the target battery, a battery protection signal needs to be generated based on the battery voltage signal and the preset positive connection voltage signal threshold, so as to perform corresponding protection on the target battery through this battery protection signal.

[0105] In summary, since this embodiment does not achieve battery reverse connection protection on the basis of battery overvoltage protection by increasing a bias voltage, but realizes battery reverse connection protection and battery overvoltage protection of the target battery through the battery voltage signal of the target battery collected and the level signal generated according to this battery voltage signal, there is no need to increase a bias voltage on the battery voltage acquisition module in battery protection, thus avoiding the problem of affecting the battery voltage sampling accuracy caused by increasing the bias voltage and ensuring the sampling accuracy of the battery voltage. In addition, since this embodiment completes the above operations in the same execution process, this embodiment completes the above operations on the same control line, thus being able to avoid the problem of increased cost caused by setting multiple protection lines and reducing the cost of battery protection. Therefore, this application can reduce the cost of battery protection on the basis of ensuring the sampling accuracy of the battery voltage.

[0106] In addition, this application also provides a photovoltaic energy storage inverter, which includes the above battery protection device. This battery protection device is connected to the target battery 100 and is used to protect the target battery 100. It can be understood that since the above battery protection device is used in the photovoltaic energy storage inverter, the embodiments of this photovoltaic energy storage inverter include all the technical solutions of all the embodiments of the above battery protection device, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0107] In addition, the present application further provides an integrated energy storage device, which includes a photovoltaic energy storage inverter and a target battery 100. The photovoltaic energy storage inverter includes the above-mentioned battery protection device. The AC side of the photovoltaic energy storage inverter is connected to the power grid and the load. The target battery 100 is connected to the battery protection device, and the battery protection device is used to protect the target battery 100. It can be understood that since the above-mentioned battery protection device is used in the integrated energy storage device, therefore, the embodiments of the integrated energy storage device include all the technical solutions of all the embodiments of the above-mentioned battery protection device, and the achieved technical effects are also exactly the same, so details are not described herein again.

[0108] In addition, the present application further provides an energy storage system, which includes a photovoltaic module, a photovoltaic energy storage inverter and a target battery 100. The photovoltaic energy storage inverter includes the above-mentioned battery protection device. The DC side of the photovoltaic energy storage inverter is connected to the photovoltaic module. The AC side of the photovoltaic energy storage inverter is connected to the power grid and the load. The target battery 100 is connected to the battery protection device, and the battery protection device is used to protect the target battery 100. It can be understood that since the above-mentioned battery protection device is used in the energy storage system, therefore, the embodiments of the energy storage system include all the technical solutions of all the embodiments of the above-mentioned battery protection device, and the achieved technical effects are also exactly the same, so details are not described herein again.

[0109] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the specification and drawings of the present application under the application concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery protection device, characterized in that, The battery protection device includes a battery voltage acquisition module, a battery detection module, and a main control module; The battery voltage acquisition module is respectively connected to the target battery, the battery detection module, and the main control module, and the battery detection module is connected to the main control module; The battery voltage acquisition module is used to acquire the battery voltage signal of the target battery and output the battery voltage signal to the battery detection module and the main control module; The battery detection module is used to generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold, and output the level signal to the main control module; The main control module is used to generate a battery protection signal according to the battery voltage signal and a preset positive connection voltage signal threshold to protect the target battery when detecting that the level signal is a low level signal, wherein the battery protection signal includes a battery reverse connection protection signal or a battery overvoltage protection signal.

2. The battery protection device according to claim 1, characterized in that, The level signal includes a high level signal and a low level signal, and the battery detection module is used for: If the battery voltage signal is greater than the preset conventional voltage signal threshold, generating the low level signal; If the battery voltage signal is less than or equal to the preset conventional voltage signal threshold, determining whether the battery voltage signal is less than a preset positive voltage signal threshold, wherein the preset positive voltage signal threshold is less than the preset conventional voltage signal threshold; If the battery voltage signal is less than the preset positive voltage signal threshold, generating the low level signal; If the battery voltage signal is greater than or equal to the preset positive voltage signal threshold, generating the high level signal.

3. The battery protection device according to claim 1, wherein The main control module is used for: When detecting that the level signal is a low level signal, determining whether the battery voltage signal is less than the preset positive connection voltage signal threshold; If so, generating the battery reverse connection protection signal to perform reverse connection protection on the target battery; If not, generating the battery overvoltage protection signal to perform overvoltage protection on the target battery.

4. The battery protection device according to claim 1, wherein The battery voltage acquisition module includes a differential circuit and an operational amplifier; The positive and negative electrodes of the target battery are respectively connected to the two input ends of the differential circuit, the output end of the differential circuit is connected to the input end of the operational amplifier, and the output end of the operational amplifier is connected to the input end of the battery detection module and the input end of the main control module; The differential circuit is used to determine the voltage acquisition ratio according to the resistance values of the internal resistors; The operational amplifier is used to acquire the battery voltage signal of the target battery according to the voltage acquisition ratio.

5. The battery protection device according to claim 1, wherein, The battery detection module includes a comparator; The positive input end of the comparator is connected to the preset conventional voltage signal threshold, the negative input end of the comparator is connected to the output end of the battery voltage acquisition module, and the output end of the comparator is connected to the input end of the main control module; The comparator is used to generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold, and output the level signal to the main control module.

6. The battery protection device according to claim 5, characterized in that The battery detection module further includes a hysteresis circuit; The hysteresis circuit is respectively connected to the positive input end and the output end of the comparator; The hysteresis circuit is used to stabilize the level signal generated by the comparator.

7. The battery protection device according to claim 1, characterized in that The main control module includes a clamping diode and a main control chip; One end of the clamping diode is connected to the output end of the battery voltage acquisition module, the other end of the clamping diode is connected to the first input end of the main control chip, and the second input end of the main control chip is connected to the output end of the battery detection module; The clamping diode is used to perform clamping processing on the battery voltage signal to obtain a voltage clamping signal; The main control chip is used to generate a battery protection signal according to the voltage clamping signal and a preset forward connection voltage signal threshold when detecting that the level signal is a low level signal, so as to protect the target battery.

8. The battery protection device according to any one of claims 1 to 7, characterized in that The battery protection device further includes a current limiting module; The current limiting module is respectively connected to the battery voltage acquisition module and the main control module; The current limiting module is used to limit the magnitude of the current signal output from the battery voltage acquisition module to the main control module.

9. A battery protection method, characterized in that, The battery protection method is applied to the battery protection device according to any one of claims 1 to 8, and the battery protection method includes: Obtain the battery voltage signal of the target battery connected to the battery protection device; Generate a level signal according to the battery voltage signal and a preset conventional voltage signal threshold; If it is detected that the level signal is a low level signal, generate a battery protection signal according to the battery voltage signal and a preset forward connection voltage signal threshold to protect the target battery, wherein the battery protection signal includes a battery reverse connection protection signal or a battery overvoltage protection signal.

10. A photovoltaic energy storage inverter, characterized in that, The photovoltaic energy storage inverter includes the battery protection device according to any one of claims 1 to 8; the battery protection device is connected to the target battery, and the battery protection device is used to protect the target battery.

11. An integrated energy storage device, characterized in that, The energy storage integrated machine includes a photovoltaic energy storage inverter and a target battery, and the photovoltaic energy storage inverter includes the battery protection device according to any one of claims 1 to 8; the battery protection device is connected to the target battery; the battery protection device is used to protect the target battery.

12. An energy storage system, characterized in that, The energy storage system includes a photovoltaic module, a photovoltaic energy storage inverter and a target battery, and the photovoltaic energy storage inverter includes the battery protection device according to any one of claims 1 to 8; the photovoltaic energy storage inverter is connected to the photovoltaic module, the battery protection device is connected to the target battery; the battery protection device is used to protect the target battery.

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