Battery protection control circuit and mobile power supply

Abstract

The invention relates to the technical field of battery protection, and discloses a battery protection control circuit and a mobile power supply, the battery protection control circuit comprises a redundancy protection circuit; the first end of the redundancy protection circuit is electrically connected with the first end of the main protection circuit and the negative electrode of the battery pack; the battery pack is composed of a battery cell group comprising a plurality of battery cells; the second end of the redundancy protection circuit is electrically connected with the positive electrode of the battery cell group; the third end of the redundancy protection circuit is electrically connected with a middle sampling point of the battery cell group; the fourth end of the redundancy protection circuit is electrically connected with a voltage reference point; the fifth end of the redundancy protection circuit is grounded; when it is detected that the charging voltage of any battery cell is larger than the charging protection voltage, charging operation is stopped through the redundancy protection circuit; when it is detected that the battery pack meets the preset charging recovery condition, the charging operation is recovered. Therefore, by implementing the method, a recoverable, low-energy-loss, accurate and efficient protection function can be realized under the condition of overcharge test or protection loop failure.

Description

Technical Field

[0001] This invention relates to the field of battery protection technology, and in particular to a battery protection control circuit and a mobile power supply. Background Technology

[0002] With the widespread use of portable power banks (such as power banks), their safety performance has become a major concern, especially the safety risks of thermal runaway, fire, and even explosion caused by overcharging of the battery cells. To address this issue, countries around the world, including my country, have successively upgraded the safety standards for portable power banks in various aspects, from technical standards and certification regulations to market access standards, comprehensively strengthening the safety requirements for portable power banks. In the new standards, the overcharging test has become one of the most prone to failure stages in the certification process. This is because the test requires bypassing the DC-DC circuit (Direct Current to Direct Current converter) and simulating a single fault in the charging protection circuit components. The new regulations not only require that the battery cells not catch fire or explode during this test, but also further limit the battery cell temperature to no more than 90°C, placing higher demands on system stability and leading to a higher risk of test failure for existing products.

[0003] Currently, the traditional solutions in the industry to address the above problems often involve adding fuses to the input / output ports or PTCs (Positive Temperature Coefficient) to the battery cells. These provide protection by cutting off the circuit or increasing resistance when the charging current exceeds a predetermined value. However, these traditional solutions have significant drawbacks: First, after an abnormal short circuit, the one-time fuse will irreversibly melt, causing the power bank to malfunction, severely impacting user experience and incurring high after-sales costs. Second, during the power bank's energy storage and charging / discharging processes, heat is generated due to energy conversion and transmission. Because of its material properties, the resistance of the PTC increases with operating temperature, reducing the battery cell's capacity output and continuously causing energy loss.

[0004] Therefore, it is particularly important to propose a technical solution that can achieve recoverable, low-energy-loss, precise and efficient protection functions in the event of overcharging or protection circuit failure, thereby effectively reducing the safety risks of power banks and improving their safety and reliability. Summary of the Invention

[0005] This invention provides a battery protection control circuit and a power bank that can achieve recoverable, low-energy-loss, precise and efficient protection functions in the event of overcharging or protection circuit failure, thereby effectively reducing the safety risks of the power bank and improving the safety and reliability of the power bank.

[0006] To address the aforementioned technical problems, the first aspect of this invention discloses a battery protection control circuit, which includes a redundant protection circuit, wherein: The first terminal of the redundant protection circuit is used to electrically connect to the first terminal of the main protection circuit, and the first terminal of the redundant protection circuit is also used to electrically connect to the negative terminal of the battery pack; wherein, the battery pack is assembled from battery cell groups, and the battery cell group includes multiple battery cells; the second terminal of the redundant protection circuit is used to electrically connect to the positive terminal of the battery cell group; the third terminal of the redundant protection circuit is used to electrically connect to the intermediate sampling point of the battery cell group; the fourth terminal of the redundant protection circuit is used to electrically connect to the voltage reference point; the fifth terminal of the redundant protection circuit is used for grounding; The redundant protection circuit is used to control the cessation of charging operation for the battery pack when it detects that the charging voltage of any of the battery cells is greater than the preset charging protection voltage; and to control the resumption of charging operation for the battery pack when it detects that the battery pack meets the preset charging recovery conditions.

[0007] As an optional implementation, in the first aspect of the present invention, the redundancy protection circuit includes a redundancy protection control module, a drive module, and a redundancy charging control module, wherein: The first terminal of the redundancy protection control module is used to electrically connect to the positive terminal of the battery cell assembly; the second terminal of the redundancy protection control module is used to electrically connect to the intermediate sampling point of the battery cell assembly; the third and fourth terminals of the redundancy protection control module and the first terminal of the drive module are respectively used to electrically connect to the voltage reference point; the fifth terminal of the redundancy protection control module is electrically connected to the second terminal of the drive module; the third terminal of the drive module is electrically connected to the first terminal of the redundancy charging control module; the second terminal of the redundancy charging control module is used for grounding; the third terminal of the redundancy charging control module is used to electrically connect to the first terminal of the main protection circuit and the negative terminal of the battery pack. The redundancy protection control module is used to output a redundancy protection control signal to the drive module when it detects that the charging voltage of any of the battery cells is greater than the charging protection voltage, so as to control the redundancy charging control module to turn off through the drive module, thereby controlling the cessation of charging operation for the battery pack. The redundancy protection control module is further configured to output a recovery control signal to the drive module when it detects that the battery pack meets the charging recovery conditions, so as to control the redundancy charging control module to be turned on through the drive module, thereby controlling the recovery of the charging operation for the battery pack.

[0008] As an optional implementation, in the first aspect of the present invention, the redundancy protection control module includes a redundancy protection chip, wherein: The charging control terminal of the redundant protection chip is electrically connected to the second terminal of the drive module; the protection input terminal and the power ground terminal of the redundant protection chip are respectively used to electrically connect to the voltage reference point; the positive power terminal of the redundant protection chip is used to electrically connect to the positive terminal of the battery cell assembly; the voltage monitoring terminal of the redundant protection chip is used to electrically connect to the intermediate sampling point of the battery cell assembly.

[0009] As an optional implementation, in the first aspect of the present invention, the redundancy protection control module further includes a first filtering unit and a second filtering unit, wherein: The first end of the first filter unit is electrically connected to the positive terminal of the power supply of the redundant protection chip, the second end of the first filter unit is used to electrically connect to the positive terminal of the battery pack, and the third end of the first filter unit is used to electrically connect to the voltage reference point. The first end of the second filter unit is electrically connected to the voltage monitoring terminal of the redundant protection chip, the second end of the second filter unit is used to electrically connect to the intermediate sampling point of the battery pack, and the third end of the second filter unit is used to electrically connect to the voltage reference point.

[0010] As an optional implementation, in a first aspect of the invention, the driving module includes a driving switching device, wherein: The first terminal of the driving switch is electrically connected to the voltage reference point; the second terminal of the driving switch is electrically connected to the fifth terminal of the redundancy protection control module; and the third terminal of the driving switch is electrically connected to the first terminal of the redundancy charging control module.

[0011] As an optional implementation, in the first aspect of the present invention, the redundant charging control module includes a redundant charging control switching device, wherein: The first terminal of the redundant charging control switch is electrically connected to the third terminal of the drive module; the second terminal of the redundant charging control switch is used for grounding; and the third terminal of the redundant charging control switch is used for electrically connecting the first terminal of the main protection circuit and the negative terminal of the battery pack.

[0012] As an optional implementation, in the first aspect of the present invention, the battery protection control circuit further includes the main protection circuit, wherein: The first terminal of the main protection circuit is electrically connected to the first terminal of the redundant protection circuit, and the first terminal of the main protection circuit is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main protection circuit is used to electrically connect to the positive terminal of the battery cell assembly; the third terminal of the main protection circuit is used to electrically connect to the intermediate sampling point of the battery cell assembly; the fourth terminal of the main protection circuit is used to electrically connect to the negative terminal of the battery cell assembly; and the fifth terminal of the main protection circuit is used to electrically connect to the voltage reference point. The main protection circuit is used to control and stop the charging or discharging operation of the battery pack when it detects that the target cell parameters of any of the battery cells meet the preset abnormal cell conditions.

[0013] As an optional implementation, in the first aspect of the present invention, the main protection circuit includes a main protection control module and a main charge / discharge control module, wherein: The first terminal of the main charge / discharge control module and the first terminal of the main protection control module are electrically connected to the first terminal of the redundant protection circuit, and the first terminals of the main charge / discharge control module and the main protection control module are also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main charge / discharge control module is electrically connected to the second terminal of the main protection control module; the third terminal of the main charge / discharge control module is electrically connected to the third terminal of the main protection control module; the fourth terminals of the main charge / discharge control module and the main protection control module are both used to electrically connect to the negative terminal of the cell assembly and the voltage reference point; the fifth terminal of the main protection control module is used to electrically connect to the intermediate sampling point of the cell assembly; the sixth terminal of the main protection control module is used to electrically connect to the positive terminal of the cell assembly. The main protection control module is used to output a main protection control signal to the main charge / discharge control module when it detects that the charging voltage or discharging voltage of any of the battery cells is greater than a preset discharge protection voltage, so as to control the main charge / discharge control module to shut down, thereby controlling the cessation of charging or discharging operations for the battery pack; wherein, the main protection control signal includes a main charging protection control signal or a main discharging protection control signal.

[0014] As an optional implementation, in the first aspect of the present invention, the main charge / discharge control module includes a main charge control unit and a main discharge control unit, wherein: The first terminal of the main charging control unit is electrically connected to the first terminal of the main protection control module and the first terminal of the redundant protection circuit, and the first terminal of the main charging control unit is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main charging control unit is electrically connected to the second terminal of the main protection control module; the first terminal of the main discharging control unit is used to electrically connect to the negative terminal of the battery cell group and the voltage reference point; the second terminal of the main discharging control unit is electrically connected to the third terminal of the main protection control module; the third terminal of the main charging control unit is electrically connected to the third terminal of the main discharging control unit. The main protection control module is used to output the main charging protection control signal to the main charging control unit when it detects that the charging voltage of any of the battery cells is greater than the preset charging protection voltage, so as to control the main charging control unit to shut down, thereby controlling the cessation of charging operation for the battery pack. The main protection control module is further configured to output the main discharge protection control signal to the main discharge control unit when it detects that the discharge voltage of any of the battery cells is greater than the preset discharge protection voltage, so as to control the main discharge control unit to shut down, thereby controlling the cessation of the discharge operation on the battery pack.

[0015] A second aspect of the present invention discloses a portable power supply, the portable power supply including a battery pack and a battery protection control circuit for the battery pack, as disclosed in any of the first aspects.

[0016] Compared with the prior art, the present invention has the following beneficial effects: Implementing this invention provides a simple and easy-to-implement battery protection control circuit. Through redundant protection circuitry, it stops charging when the charging voltage of any cell in the battery pack exceeds a preset charging protection voltage, and resumes charging when the battery pack meets preset charging recovery conditions. This allows for timely implementation of appropriate charging protection measures in cases of overcharging or failure of the primary protection circuit of the power bank. It achieves recoverable, low-energy-loss, precise, and efficient battery protection, effectively preventing overcharging and other safety hazards caused by excessive battery temperature (such as fire or explosion). Therefore, it effectively reduces the safety risks of the power bank, thereby improving its safety and reliability, and ultimately enhancing the user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a battery protection control circuit disclosed in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a battery pack disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; Figure 4 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; Figure 5 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; Figure 6 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; Figure 7 This is a schematic diagram of the application architecture of a battery protection control circuit disclosed in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a Type-C interface disclosed in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a DC-DC BuckBoost circuit disclosed in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a portable power bank disclosed in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that, unless otherwise explicitly specified and limited, the term "electrical connection" in the specification, claims, and accompanying drawings of this invention should be interpreted broadly. For example, it can refer to a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical-electrical connection, or a connection capable of communication; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two elements or the interaction between two elements. Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Example 1 Please see Figure 1 , Figure 1 This is a schematic diagram of a battery protection control circuit disclosed in an embodiment of the present invention. This circuit can be applied to a power supply, preferably to a portable power bank, and can also be applied to electronic devices equipped with a power supply; the embodiments of the present invention do not limit its application. Figure 1 As shown, the battery protection control circuit may include a redundant protection circuit 10, wherein: The first terminal of the redundant protection circuit 10 is used to electrically connect to the first terminal of the main protection circuit 20, and the first terminal of the redundant protection circuit 10 is also used to electrically connect to the negative terminal of the battery pack; wherein, the battery pack is assembled from battery cell groups, and the battery cell group includes multiple battery cells; the second terminal of the redundant protection circuit 10 is used to electrically connect to the positive terminal of the battery cell group; the third terminal of the redundant protection circuit 10 is used to electrically connect to the intermediate sampling point of the battery cell group; the fourth terminal of the redundant protection circuit 10 is used to electrically connect to the voltage reference point; and the fifth terminal of the redundant protection circuit 10 is used for grounding.

[0022] The redundant protection circuit 10 is used to control the cessation of charging operation for the battery pack when the charging voltage of any cell is detected to be greater than a preset charging protection voltage; and to control the resumption of charging operation for the battery pack when the battery pack meets the preset charging recovery conditions.

[0023] It can be understood that "battery pack" can refer to the collective term for all the battery cells included in a battery pack, and the battery pack is obtained by assembling the battery cell groups; for example, taking a battery pack containing two cells as an example, the structure of the battery pack can be found in [reference needed]. Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery pack disclosed in an embodiment of the present invention; as shown below. Figure 2As shown, the battery pack may include cell 1 and cell 2, and cell 1 and cell 2 are electrically connected. Terminal A is the negative terminal of the battery pack, terminal B is the negative terminal of the cell group, terminal C is the intermediate sampling point of the cell group, and terminal D is the positive terminal of the cell group. This embodiment of the invention does not limit the scope of the invention.

[0024] Optionally, the voltage reference point can be a voltage point related to the negative terminal of the battery pack (e.g., B-) to pull the potential down to ground; however, this embodiment of the invention does not limit this.

[0025] Optionally, the charging voltage of any cell can be determined in the following way: When the cell group includes two cells, assuming the cell group includes a first cell and a second cell, during the battery pack charging process, the first charging voltage of the first cell can be calculated by the voltage value corresponding to the positive terminal of the cell group and the intermediate sampling point of the cell group, and the second charging voltage of the second cell can be calculated by the voltage value corresponding to the intermediate sampling point of the cell group and the voltage reference point. This embodiment of the invention does not limit the calculation.

[0026] Optionally, when the redundant protection circuit 10 detects that the charging voltage of any cell is greater than a preset charging protection voltage, it controls to stop the charging operation for the battery pack. Specifically, in the case of overcharging test of the power bank or failure of the power bank's original protection circuit (such as the main protection circuit), when it detects that the charging voltage of any cell is greater than the preset charging protection voltage and the duration for which the charging voltage is greater than the charging protection voltage is greater than the preset protection delay duration, it controls to stop the charging operation for the battery pack. This embodiment of the invention is not limited. Further optionally, in the overcharging test, it is necessary to simulate the fault of a single component in the redundant protection circuit or the main protection circuit. This embodiment of the invention is not limited. Further optionally, the fault simulation can be connected to the above-mentioned redundant protection circuit or main protection circuit through the negative terminal of the battery pack, the positive terminal of the cell group, the negative terminal of the cell group, and the ground wire to realize the fault simulation of a single component. This embodiment of the invention is not limited.

[0027] Further optionally, the redundant protection circuit 10 can detect whether the battery pack meets the preset charging recovery conditions in the following ways: when the fault corresponding to the above-mentioned redundant protection circuit or main protection circuit is detected to be cleared, the connection terminal corresponding to the cell group is detected to be normal. If the connection terminals of the cell group are all normal, it is determined that the battery pack meets the preset charging recovery conditions. This embodiment of the invention does not limit the scope of the invention.

[0028] As can be seen, the embodiments of the present invention provide a battery protection control circuit with a simple structure and easy implementation. Through redundant protection circuitry, it can stop the charging operation when the charging voltage of any cell in the battery pack exceeds a preset charging protection voltage, and resume the charging operation when the battery pack meets preset charging recovery conditions. This allows for timely implementation of corresponding charging protection measures in the event of overcharging testing or failure of the primary protection circuit of the power bank. It achieves a recoverable, low-energy-loss, precise, and efficient battery protection function, effectively preventing battery overcharging and other safety hazards caused by excessive battery temperature (such as fire or explosion). Therefore, it effectively reduces the safety risks of the power bank, thereby improving its safety and reliability, and ultimately enhancing the user experience.

[0029] In an optional embodiment, please refer to Figure 3 , Figure 3 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; as shown. Figure 3 As shown, the redundancy protection circuit 10 may include a redundancy protection control module 101, a drive module 102, and a redundancy charging control module 103, wherein: The first terminal of the redundancy protection control module 101 is used to electrically connect to the positive terminal of the battery cell group; the second terminal of the redundancy protection control module 101 is used to electrically connect to the intermediate sampling point of the battery cell group; the third and fourth terminals of the redundancy protection control module 101 and the first terminal of the drive module 102 are respectively used to electrically connect to the voltage reference point; the fifth terminal of the redundancy protection control module 101 is electrically connected to the second terminal of the drive module 102; the third terminal of the drive module 102 is electrically connected to the first terminal of the redundancy charging control module 103; the second terminal of the redundancy charging control module 103 is used for grounding; the third terminal of the redundancy charging control module 103 is used to electrically connect to the first terminal of the main protection circuit 20 and the negative terminal of the battery pack. The redundancy protection control module 101 is used to output a redundancy protection control signal to the drive module 102 when it detects that the charging voltage of any cell is greater than the charging protection voltage, so that the drive module 102 controls the redundancy charging control module 103 to be turned off, thereby controlling the cessation of charging operation for the battery pack. The redundancy protection control module 101 is also used to output a recovery control signal to the drive module 102 when it detects that the battery pack meets the preset charging recovery conditions, so as to control the redundancy charging control module 103 to be turned on through the drive module 102, thereby controlling the recovery of the charging operation for the battery pack.

[0030] Optionally, the redundancy protection control signal can be a low-level signal, and the recovery control signal can be a high-level signal; however, this embodiment of the invention does not impose any limitations.

[0031] As can be seen, this optional embodiment, by setting up a redundant protection control module, a drive module, and a redundant charging control module in the redundant protection circuit, enables the redundant protection control module to output a redundant protection control signal to the drive module when it detects that the charging voltage of any cell is greater than the charging protection voltage. This allows the drive module to control the redundant charging control module to shut down and stop the charging operation. Conversely, when it detects that the battery pack meets the charging recovery conditions, it outputs a recovery control signal to the drive module to control the redundant charging control module to turn on and resume the charging operation. This allows for more accurate and reliable generation and output of redundant protection control signals or recovery control signals. Consequently, the drive module can more reliably and stably control the on / off state of the redundant charging control module, thereby controlling the charging operation of the battery pack more reliably and efficiently. This, in turn, facilitates more timely, accurate, and reliable battery protection measures.

[0032] In this optional embodiment, optionally, please refer to Figure 6 , Figure 6 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; as shown below. Figure 6 As shown, the redundancy protection control module 101 may include a redundancy protection chip 1011, wherein: The charging control terminal of the redundant protection chip 1011 is electrically connected to the second terminal of the drive module 102; the protection input terminal and the power ground terminal of the redundant protection chip 1011 are respectively used to electrically connect to the voltage reference point; the positive power terminal of the redundant protection chip 1011 is used to electrically connect to the positive terminal of the battery cell group; the voltage monitoring terminal of the redundant protection chip 1011 is used to electrically connect to the intermediate sampling point of the battery cell group.

[0033] Optionally, the redundancy protection chip 1011 can be a lithium battery protection chip; for example, such as Figure 6 As shown, the redundancy protection chip 1011 can provide... Figure 6 The redundant lithium battery protection chip U2 is included; the charging control terminal can be... Figure 6 The CO pin in the circuit can be the protection input pin (VM pin), the power ground pin (VSS pin), the positive power supply pin (VDD pin), and the voltage monitoring pin (VC pin). However, this embodiment of the invention does not impose any limitations on these features.

[0034] Further optional, such as Figure 6 As shown, the redundancy protection control module 101 may further include a first protection resistor R12, wherein the protection input terminal of the redundancy protection chip 1011 is electrically connected to the first terminal of the first protection resistor R12, and the second terminal of the first protection resistor R12 is used to electrically connect to the voltage reference point. This embodiment of the invention does not limit the scope of the invention.

[0035] It should be noted that, in order to avoid the protection function of the redundant protection chip itself affecting the protection function of the redundant protection circuit during overcharge testing (e.g., affecting the internal resistance of components in the redundant protection circuit, cross-effects of protection functions, etc.), the VM pin of the redundant protection chip is connected to a voltage reference point (i.e., as shown in the diagram). Figure 6 As shown in B-), the short-circuit detection, discharge overcurrent detection, and charging overcurrent detection functions of the redundant protection chip are disabled to ensure the operational stability of the redundant protection circuit.

[0036] It is evident that by setting up redundant protection chips in the redundant protection control module, the accuracy of cell voltage detection can be improved, which in turn helps to improve the accuracy of judging whether there is a safety risk in the cell. This, in turn, helps to improve the output efficiency and accuracy of the charging control signal, so as to control the on / off state of the redundant charging control module more efficiently and reliably, and thus control the stopping and resuming of charging operations more efficiently and reliably.

[0037] In this optional embodiment, optionally, such as Figure 6 As shown, the redundancy protection control module 101 may further include a first filtering unit 1012 and a second filtering unit 1013, wherein: The first end of the first filter unit 1012 is electrically connected to the positive power supply terminal of the redundant protection chip 1011, the second end of the first filter unit 1012 is used to electrically connect to the positive terminal of the battery cell assembly, and the third end of the first filter unit 1012 is used to electrically connect to the voltage reference point. The first end of the second filter unit 1013 is electrically connected to the voltage monitoring end of the redundant protection chip 1011, the second end of the second filter unit 1013 is used to electrically connect to the intermediate sampling point of the battery pack, and the third end of the second filter unit 1013 is used to electrically connect to the voltage reference point.

[0038] Further optional, such as Figure 6 As shown, the first filter unit 1012 may include a first isolation resistor R8 and a first filter capacitor C3, wherein: The first end of the first isolation resistor R8 is electrically connected to the positive power supply terminal of the redundant protection chip 1011 and the first end of the first filter capacitor C3; the second end of the first isolation resistor R8 is used to electrically connect to the positive terminal of the battery pack; the second end of the first filter capacitor C3 is used to electrically connect to the voltage reference point. This embodiment of the invention is not limited.

[0039] Further optional, such as Figure 6 As shown, the second filter unit 1013 may include a second isolation resistor R9 and a second filter capacitor C4, wherein: The first end of the second isolation resistor R9 is electrically connected to the voltage monitoring terminal of the redundant protection chip 1011 and the first end of the second filter capacitor C4; the second end of the second isolation resistor R9 is used to electrically connect to the intermediate sampling point of the battery pack; the second end of the second filter capacitor C4 is used to electrically connect to the voltage reference point. This embodiment of the invention is not limited.

[0040] It is evident that by adding a first filter unit and a second filter unit to the redundant protection control module, the stability and accuracy of the cell voltage signal detected by the redundant protection chip can be improved. This is beneficial to further improving the accuracy of cell voltage detection, and consequently, to further improving the accuracy of judging whether there is a safety risk in the cell.

[0041] In this optional embodiment, optionally, such as Figure 6 As shown, the drive module 102 may include a drive switching device, wherein: The first terminal of the driving switch is used to electrically connect to the voltage reference point; the second terminal of the driving switch is electrically connected to the fifth terminal of the redundancy protection control module 101; and the third terminal of the driving switch is electrically connected to the first terminal of the redundancy charging control module 103.

[0042] Optionally, the driving switching device can be, for example, Figure 6 The driving transistor Q4 shown can be a PNP transistor; the driving switch can also be other electronic components that can be used for driving, and this embodiment of the invention is not limited thereto; furthermore, when the driving switch is the driving transistor Q4 and it is a PNP transistor, such as Figure 6 As shown, the first terminal of the driving switch is the base, the second terminal of the driving switch is the emitter, and the third terminal of the driving switch is the collector.

[0043] Further optional, such as Figure 6 As shown, the driving module 102 may further include a first base resistor R4, wherein: the first end of the first base resistor R4 is electrically connected to the base of the driving transistor Q4, and the second end of the first base resistor R4 is used to electrically connect to the voltage reference point. This embodiment of the invention does not limit the scope of the invention.

[0044] It is evident that by setting a drive switch device in the drive module, the control signal output by the redundant protection chip can be converted into a more reliable drive signal using simple electronic components. This improves the accuracy of controlling the on / off state of the redundant charging control module. Furthermore, it enables rapid shutdown when an abnormal cell charging voltage is detected, thereby quickly shutting down the redundant charging control module and stopping the charging operation of the battery pack more promptly, which further enhances battery protection efficiency.

[0045] In this optional embodiment, optionally, such as Figure 6 As shown, the redundant charging control module 103 may include redundant charging control switching devices, wherein: The first terminal of the redundant charging control switch is electrically connected to the third terminal of the drive module 102; the second terminal of the redundant charging control switch is used for grounding; and the third terminal of the redundant charging control switch is used for electrical connection to the first terminal of the main protection circuit 20 and the negative terminal of the battery pack.

[0046] Optionally, the redundant charging control switching device can be, for example, Figure 6 The redundant charging MOSFET Q1 shown can optionally be an N-type MOSFET; the redundant charging control switch can also be any other switch capable of controlling the on / off state of the battery pack charging path, and this embodiment of the invention is not limited thereto; furthermore, when the redundant charging control switch is the redundant charging MOSFET Q1 and is an N-type MOSFET, such as Figure 6 As shown, the first terminal of the redundant charging control switch is the gate (G), the second terminal of the redundant charging control switch is the source (S), and the third terminal of the redundant charging control switch is the drain (D). This embodiment of the invention is not limited.

[0047] Further optional, such as Figure 6 As shown, the redundant charging control module 103 may further include a gate-source resistor R3, wherein: the first end of the gate-source resistor R3 is electrically connected to the gate of the redundant charging MOSFET Q1 and the third end of the driving module 102, and the second end of the gate-source resistor R3 is electrically connected to the source of the redundant charging MOSFET Q1. This embodiment of the invention is not limited in its scope. By setting this resistor, the stability of the off-state of the redundant charging MOSFET Q1 can be improved.

[0048] It is evident that by setting redundant charging control switching devices in the redundant charging control module, the on / off state of the charging circuit can be controlled efficiently and reliably using simple electronic components, thereby more accurately controlling the stopping and resuming of charging operations, and ultimately achieving efficient and reliable charging protection functions.

[0049] In an optional embodiment, please refer to Figure 4 , Figure 4 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; as shown below. Figure 4 As shown, the battery protection control circuit may further include a main protection circuit 20, wherein: The first terminal of the main protection circuit 20 is electrically connected to the first terminal of the redundant protection circuit 10, and the first terminal of the main protection circuit 20 is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main protection circuit 20 is used to electrically connect to the positive terminal of the cell group; the third terminal of the main protection circuit 20 is used to electrically connect to the intermediate sampling point of the cell group; the fourth terminal of the main protection circuit 20 is used to electrically connect to the negative terminal of the cell group; and the fifth terminal of the main protection circuit 20 is used to electrically connect to the voltage reference point. The main protection circuit 20 is used to control and stop the charging or discharging operation of the battery pack when the target cell parameters of any cell meet the preset abnormal cell conditions.

[0050] Optionally, the target cell parameters for any cell may include cell voltage parameters, which may include charging voltage or discharging voltage. This embodiment of the invention does not impose any limitations on these parameters.

[0051] Further optionally, the main protection circuit 20 can detect whether the target cell parameters of any cell meet the preset cell abnormality conditions in the following ways: when the target cell parameters include cell voltage parameters, when it is detected that the charging voltage of any cell is greater than the preset charging protection voltage or the discharging voltage of any cell is greater than the preset discharging protection voltage, it is determined that the cell meets the preset cell abnormality conditions. This embodiment of the present invention does not limit this.

[0052] Further optionally, the main protection circuit 20 can also be used to: control the resumption of charging or discharging operations for the battery pack when the battery pack is detected to meet the charging / discharging recovery conditions, which is not limited in this embodiment of the invention.

[0053] As can be seen, this optional embodiment can monitor the cell parameters in real time through the main protection circuit when the main protection circuit is operating normally. When abnormal cell parameters are detected, the corresponding charging / discharging operation is stopped. Thus, it can undertake the core protection function in the battery protection system, effectively prevent the battery from overcharging, over-discharging, overcurrent and short circuit and provide reliable protection for the battery pack.

[0054] In this optional embodiment, optionally, please refer to Figure 5 , Figure 5 This is a schematic diagram of another battery protection control circuit disclosed in an embodiment of the present invention; as shown below. Figure 5 As shown, the main protection circuit 20 may include a main protection control module 201 and a main charge / discharge control module 202, wherein: The first terminal of the main charge / discharge control module 202 and the first terminal of the main protection control module 201 are electrically connected to the first terminal of the redundant protection circuit 10, and the first terminals of the main charge / discharge control module 202 and the main protection control module 201 are also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main charge / discharge control module 202 is electrically connected to the second terminal of the main protection control module 201; the third terminal of the main charge / discharge control module 202 is electrically connected to the third terminal of the main protection control module 201; the fourth terminal of the main charge / discharge control module 202 and the fourth terminal of the main protection control module 201 are both used to electrically connect to the negative terminal and voltage reference point of the cell group; the fifth terminal of the main protection control module 201 is used to electrically connect to the intermediate sampling point of the cell group; the sixth terminal of the main protection control module 201 is used to electrically connect to the positive terminal of the cell group. The main protection control module 201 is used to output a main protection control signal to the main charge and discharge control module 202 when the target cell parameters of any cell meet the abnormal cell conditions, so as to control the main charge and discharge control module 202 to shut down, thereby controlling the cessation of charging or discharging operations for the battery pack; wherein, the main protection control signal includes a main charging protection control signal or a main discharging protection control signal.

[0055] It is evident that by setting a main protection control module and a main charge / discharge control module in the main protection circuit, when the target cell parameters of any cell meet the abnormal cell conditions, a main protection control signal can be output to the main charge / discharge control module to control the main charge / discharge control module to shut down, thereby controlling the cessation of charging or discharging operations for the battery pack. This enables more precise and reliable generation and output of the main protection control signal, thus allowing for more reliable and stable control of the on / off state of the redundant charging control module. This, in turn, allows for more reliable and efficient control of the charging / discharging operations for the battery pack, and ultimately facilitates more timely, accurate, and reliable battery protection measures.

[0056] In this optional embodiment, optionally, such as Figure 6 As shown, the main protection control module 201 may include a main protection chip 2011 and an equalization unit 2012, wherein: The first terminal of the main protection chip 2011 is electrically connected to the first terminal of the main charge / discharge control module 202 and the first terminal of the redundant protection circuit 10, and the first terminal of the main protection chip 2011 is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main protection chip 2011 is electrically connected to the second terminal of the main charge / discharge control module 202; the third terminal of the main protection chip 2011 is electrically connected to the third terminal of the main charge / discharge control module 202; the fourth terminal of the main protection chip 2011 and the first terminal of the equalization unit 2012 are both used to electrically connect to the negative terminal of the cell group and the voltage reference point. The fifth terminal of the main protection chip 2011 is electrically connected to the second terminal of the equalization unit 2012; the sixth terminal of the main protection chip 2011 is electrically connected to the third terminal of the equalization unit 2012; the seventh terminal of the main protection chip 2011 is electrically connected to the fourth terminal of the equalization unit 2012; and the eighth terminal of the main protection chip 2011 is electrically connected to the fifth terminal of the equalization unit 2012. The sixth terminal of the equalization unit 2012 is used to electrically connect to the intermediate sampling point of the battery cell assembly; and the seventh terminal of the equalization unit 2012 is used to electrically connect to the positive terminal of the battery cell assembly.

[0057] Optionally, the main protection chip 2011 can be a lithium battery protection chip; for example, such as Figure 6 As shown, the main protection chip 2011 can be Figure 6 The main lithium battery protection chip U1; furthermore, the first terminal of the main protection chip 2011 can be a protection input terminal, that is, it can be... Figure 6 The VM pin in the circuit; the second terminal of the main protection chip 2011 can be the charging control terminal, that is, it can be... Figure 6 The CO pin in the circuit; the third terminal of the main protection chip 2011 can be the discharge control terminal, that is, it can be... Figure 6 The DO pin in the circuit; the fourth terminal of the main protection chip 2011 can be the power ground terminal, that is, it can be... Figure 6 The VSS pin in the circuit; the fifth terminal of the main protection chip 2011 can be the second equalization terminal, that is, it can be... Figure 6 The BAL2 pin in the circuit; the sixth pin of the main protection chip 2011 can be a voltage monitoring pin, that is, it can be used as... Figure 6 The VC pin in the circuit; the seventh pin of the main protection chip 2011 can be the first equalization pin, that is, it can be... Figure 6 The BAL1 pin in the circuit; the eighth terminal of the main protection chip 2011 can be the positive power supply terminal, that is, it can be... Figure 6 The VDD pin in this embodiment of the invention is not limited.

[0058] It is evident that by setting a main protection chip and an equalization unit in the main protection control module 201, the accuracy of cell voltage detection can be improved, thereby enhancing the accuracy of determining whether there are safety risks in the cells. This, in turn, improves the output efficiency and accuracy of the charging control signal, enabling more efficient and reliable control of the on / off state of the redundant charging control module, and thus more efficient and reliable control of the stopping and resuming of charging operations. Furthermore, the equalization unit enables the voltage of the cell group to be balanced, thereby improving the operational safety and stability of the battery pack, and ultimately enhancing the safety and reliability of the battery pack in use.

[0059] In this optional embodiment, optionally, such as Figure 6As shown, the equalization unit 2012 may include a first equalization transistor Q5, a second equalization transistor Q6, a third filter unit, a fourth filter unit, a second base resistor R5, a third base resistor R10, a first collector resistor R6, and a second collector resistor R11; wherein, the third filter unit may include a third isolation resistor R1 and a third filter capacitor C1, and the fourth filter unit may include a fourth isolation resistor R7 and a fourth filter capacitor C2, wherein: The base of the first equalizing transistor Q5 is electrically connected to the first terminal of the second base resistor R5, and the second terminal of the second base resistor R5 is electrically connected to the seventh terminal of the main protection chip 2011; the emitter of the first equalizing transistor Q5 is electrically connected to the first terminal of the third isolation resistor R1, and the emitter of the first equalizing transistor Q5 is also used to electrically connect to the positive terminal of the battery cell assembly; the second terminal of the third isolation resistor R1 is electrically connected to the eighth terminal of the main protection chip 2011 and the first terminal of the third filter capacitor C1, and the second terminal of the third filter capacitor C1 is used to electrically connect to the voltage reference point; the collector of the first equalizing transistor Q5 is electrically connected to the first collector resistor R6; the second terminal of the first collector resistor R6 is electrically connected to the eighth terminal of the main protection chip 2011 and the first terminal of the third filter capacitor C1, respectively. The first terminal of the fourth isolation resistor R7 is electrically connected to the emitter of the second equalizing transistor Q6 and the intermediate sampling point of the battery cell assembly; the second terminal of the fourth isolation resistor R7 is electrically connected to the sixth terminal of the main protection chip 2011 and the first terminal of the fourth filter capacitor C2; the second terminal of the fourth filter capacitor C2 is used to electrically connect to the voltage reference point; the base of the second equalizing transistor Q6 is electrically connected to the first terminal of the third base resistor R10, and the second terminal of the third base resistor R10 is electrically connected to the fifth terminal of the main protection chip 2011; the collector of the second equalizing transistor Q6 is electrically connected to the first terminal of the second collector resistor R11, and the second terminal of the second collector resistor R11 is used as the negative terminal of the battery cell assembly and the voltage reference point.

[0060] It is evident that this configuration of the equalization unit enables the equalization function through an easily implemented circuit structure, thereby facilitating more efficient and cost-effective voltage equalization of the battery cell pack.

[0061] In this optional embodiment, optionally, such as Figure 6 As shown, the main charge / discharge control module 202 may include a main charge control unit 2021 and a main discharge control unit 2022, wherein: The first terminal of the main charging control unit 2021 is electrically connected to the first terminal of the main protection control module 201 and the first terminal of the redundant protection circuit 10, and the first terminal of the main charging control unit 2021 is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main charging control unit 2021 is electrically connected to the second terminal of the main protection control module 201; the first terminal of the main discharging control unit 2022 is used to electrically connect to the negative terminal of the battery cell group and the voltage reference point; the second terminal of the main discharging control unit 2022 is electrically connected to the third terminal of the main protection control module 201; the third terminal of the main charging control unit 2021 is electrically connected to the third terminal of the main discharging control unit 2022. The main protection control module 201 is used to output a main charging protection control signal to the main charging control unit 2021 when it detects that the charging voltage of any cell is greater than the preset charging protection voltage, so as to control the main charging control unit 2021 to turn off, thereby controlling the cessation of charging operation for the battery pack. The main protection control module 201 is also used to output a main discharge protection control signal to the main discharge control unit 2022 when it detects that the discharge voltage of any cell is greater than the preset discharge protection voltage, so as to control the main discharge control unit 2022 to turn off, thereby controlling the stop of the discharge operation for the battery pack.

[0062] Optionally, the main charging control unit 2021 may include a main charging control switch device; further optionally, the main charging control switch device may be such as Figure 6 The main charging MOSFET Q2 shown can optionally be an N-type MOSFET; the main charging control switch can also be any other switch capable of controlling the on / off state of the battery pack charging path, and this embodiment of the invention is not limited thereto; furthermore, when the main charging control switch is the main charging MOSFET Q2 and is an N-type MOSFET, such as Figure 6 As shown, the first terminal of the main charging control switch is the source (S), the second terminal of the main charging control switch is the gate (G), and the third terminal of the main charging control switch is the drain (D). This embodiment of the invention is not limited.

[0063] Optionally, the main discharge control unit 2022 may include a main discharge control switch device; further optionally, the main discharge control switch device may be such as... Figure 6 The main discharge MOSFET Q3 shown can optionally be an N-type MOSFET; the main discharge control switch can also be any other switch capable of controlling the on / off state of the battery pack discharge path, and this embodiment of the invention is not limited thereto; furthermore, when the main discharge control switch is the main discharge MOSFET Q3 and is an N-type MOSFET, such as Figure 6As shown, the first terminal of the main discharge control switch is the source (S), the second terminal of the main discharge control switch is the gate (G), and the third terminal of the main discharge control switch is the drain (D). This embodiment of the invention is not limited.

[0064] It is evident that by setting a main charging control unit and a main discharging control unit in the main charging and discharging control module, the on / off state of the charging / discharging circuit of the battery pack can be controlled more accurately, flexibly, and efficiently under the normal operation of the main protection circuit. This results in more efficient and accurate control of the charging / discharging operation, thereby achieving efficient and reliable battery protection.

[0065] The working principle of the battery protection control circuit in this embodiment of the invention is as follows: First, let's introduce the main circuit functions related to the battery protection control circuit: The battery pack that the battery protection control circuit needs to protect can be used to store electrical energy; the main protection circuit can be regarded as the first battery management system, which is mainly used to monitor the cell voltage in real time, thereby avoiding safety risks such as overcharging, over-discharging, overcurrent and short circuit, and cut off the abnormal circuit through the charging and discharging MOS switch; the redundant protection circuit can be regarded as the second battery management system, or it can be regarded as an additional protection circuit on the basis of the original protection circuit (i.e., the main protection circuit). The redundant protection circuit can be used to monitor the charging cell voltage in real time. When the cell charging voltage exceeds the preset value, the protection chip is triggered to output a low-level signal to control the charging MOS switch to cut off the charging circuit; For the overcharging test of power banks, please refer to the process architecture of the overcharging test. Figure 7 , Figure 7 This is a schematic diagram of the application architecture of a battery protection control circuit disclosed in an embodiment of the present invention; wherein, Figure 7 The “charge and discharge MOS” (i.e., the main charge and discharge control module mentioned above) and its corresponding “protection control” module (i.e., the main protection control module mentioned above) belong to the main protection circuit mentioned above. Figure 7 The "charging MOS" (i.e., the aforementioned redundant charging control module) and its corresponding "drive" module (i.e., the aforementioned drive module) and "protection control" module (i.e., the aforementioned redundant protection control module) belong to the aforementioned redundant protection circuit. Optionally, the structure of this Type-C interface can be found in [reference needed]. Figure 8 , Figure 8 This is a schematic diagram of a Type-C interface disclosed in an embodiment of the present invention; the structure of the DC-DC BuckBoost circuit can be found in [reference needed]. Figure 9 , Figure 9 This is a schematic diagram of a DC-DC BuckBoost circuit disclosed in an embodiment of the present invention. Specifically, as shown... Figure 6As shown, during normal battery charging, the redundant lithium battery protection chip U2 detects the voltage of the first battery connected between the VDD and VC terminals or the voltage of the second battery connected between the VC and VSS terminals. When neither the voltage of the first battery nor the voltage of the second battery exceeds the preset charging protection voltage, the second pin CO of U2 outputs a high-level signal, thereby turning on the redundant charging MOSFET Q1 under the drive of the drive module. However, during overcharge testing, as... Figure 7 As shown, the aforementioned DC-DC BuckBoost circuit needs to be bypassed, and single-component fault simulation is performed on the protection circuits (such as the aforementioned main protection circuit and redundant protection circuit). When the redundant lithium battery protection chip U2 detects that the voltage of the first battery or the second battery exceeds the preset charging protection voltage, and the duration of this state exceeds the preset protection delay time, the output voltage of pin CO of U2 changes from high level to low level, thereby turning off the redundant charging MOSFET Q1 and stopping battery charging. Similarly, when the main lithium battery protection chip U1 detects that the voltage of the first battery or the second battery exceeds the preset charging protection voltage, it controls the corresponding main charging MOSFET Q2 or main discharging MOSFET Q3 to turn off. Therefore, it can prevent battery overcharging after DC-DC failure and primary lithium battery protection failure, and ensure that the battery cell surface temperature does not exceed 90°C or other safety hazards (such as fire, explosion, etc.).

[0066] Example 2 Please see Figure 10 , Figure 10 This is a schematic diagram of a portable power bank disclosed in an embodiment of the present invention. The portable power bank includes a battery pack and a battery protection control circuit for the battery pack, as described in any of the embodiments in Example 1. The protection functions achievable by this portable power bank include, but are not limited to, stopping the charging operation when an abnormal cell charging voltage is detected in the event of an overcharge test or a protection circuit failure. It should be noted that for a detailed description of the portable power bank, please refer to the specific description in Example 1; this embodiment will not repeat it.

[0067] It is evident that implementation Figure 10The described power bank provides a simple and easy-to-implement battery protection control circuit that stops charging when the charging voltage of any cell in the battery pack exceeds a preset charging protection voltage, and resumes charging when the battery pack meets preset charging recovery conditions. This allows for timely implementation of appropriate charging protection measures in case of overcharging or failure of the power bank's primary protection circuit. It achieves recoverable, low-energy-loss, precise, and efficient battery protection, effectively preventing overcharging and other safety hazards caused by excessive battery temperature (such as fire or explosion). Therefore, it effectively reduces the safety risks of the power bank, thereby improving its safety and reliability, and ultimately enhancing the user experience.

[0068] Finally, it should be noted that the battery protection control circuit and mobile power supply disclosed in the embodiments of the present invention are merely preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery protection control circuit, characterized in that, The battery protection control circuit includes redundant protection circuitry, wherein: The first terminal of the redundant protection circuit is used to electrically connect to the first terminal of the main protection circuit, and the first terminal of the redundant protection circuit is also used to electrically connect to the negative terminal of the battery pack; wherein, the battery pack is assembled from battery cell groups, and the battery cell group includes multiple battery cells; the second terminal of the redundant protection circuit is used to electrically connect to the positive terminal of the battery cell group; the third terminal of the redundant protection circuit is used to electrically connect to the intermediate sampling point of the battery cell group; the fourth terminal of the redundant protection circuit is used to electrically connect to the voltage reference point; the fifth terminal of the redundant protection circuit is used for grounding; The redundant protection circuit is used to control the cessation of charging operation for the battery pack when it detects that the charging voltage of any of the battery cells is greater than the preset charging protection voltage; and to control the resumption of charging operation for the battery pack when it detects that the battery pack meets the preset charging recovery conditions.

2. The battery protection control circuit according to claim 1, characterized in that, The redundancy protection circuit includes a redundancy protection control module, a drive module, and a redundancy charging control module, wherein: The first terminal of the redundancy protection control module is used to electrically connect to the positive terminal of the battery cell assembly; the second terminal of the redundancy protection control module is used to electrically connect to the intermediate sampling point of the battery cell assembly; the third and fourth terminals of the redundancy protection control module and the first terminal of the drive module are respectively used to electrically connect to the voltage reference point; the fifth terminal of the redundancy protection control module is electrically connected to the second terminal of the drive module; the third terminal of the drive module is electrically connected to the first terminal of the redundancy charging control module; the second terminal of the redundancy charging control module is used for grounding; the third terminal of the redundancy charging control module is used to electrically connect to the first terminal of the main protection circuit and the negative terminal of the battery pack. The redundancy protection control module is used to output a redundancy protection control signal to the drive module when it detects that the charging voltage of any of the battery cells is greater than the charging protection voltage, so as to control the redundancy charging control module to turn off through the drive module, thereby controlling the cessation of charging operation for the battery pack. The redundancy protection control module is further configured to output a recovery control signal to the drive module when it detects that the battery pack meets the charging recovery conditions, so as to control the redundancy charging control module to be turned on through the drive module, thereby controlling the recovery of the charging operation for the battery pack.

3. The battery protection control circuit according to claim 2, characterized in that, The redundancy protection control module includes a redundancy protection chip, wherein: The charging control terminal of the redundant protection chip is electrically connected to the second terminal of the drive module; the protection input terminal and the power ground terminal of the redundant protection chip are respectively used to electrically connect to the voltage reference point; the positive power terminal of the redundant protection chip is used to electrically connect to the positive terminal of the battery cell assembly; the voltage monitoring terminal of the redundant protection chip is used to electrically connect to the intermediate sampling point of the battery cell assembly.

4. The battery protection control circuit according to claim 3, characterized in that, The redundancy protection control module further includes a first filtering unit and a second filtering unit, wherein: The first end of the first filter unit is electrically connected to the positive terminal of the power supply of the redundant protection chip, the second end of the first filter unit is used to electrically connect to the positive terminal of the battery pack, and the third end of the first filter unit is used to electrically connect to the voltage reference point. The first end of the second filter unit is electrically connected to the voltage monitoring terminal of the redundant protection chip, the second end of the second filter unit is used to electrically connect to the intermediate sampling point of the battery pack, and the third end of the second filter unit is used to electrically connect to the voltage reference point.

5. The battery protection control circuit according to claim 2, characterized in that, The drive module includes a drive switching device, wherein: The first terminal of the driving switch is electrically connected to the voltage reference point; the second terminal of the driving switch is electrically connected to the fifth terminal of the redundancy protection control module; and the third terminal of the driving switch is electrically connected to the first terminal of the redundancy charging control module.

6. The battery protection control circuit according to claim 2, characterized in that, The redundant charging control module includes redundant charging control switching devices, wherein: The first terminal of the redundant charging control switch is electrically connected to the third terminal of the drive module; the second terminal of the redundant charging control switch is used for grounding; and the third terminal of the redundant charging control switch is used for electrically connecting the first terminal of the main protection circuit and the negative terminal of the battery pack.

7. The battery protection control circuit according to any one of claims 1-6, characterized in that, The battery protection control circuit also includes the main protection circuit, wherein: The first terminal of the main protection circuit is electrically connected to the first terminal of the redundant protection circuit, and the first terminal of the main protection circuit is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main protection circuit is used to electrically connect to the positive terminal of the battery cell assembly; the third terminal of the main protection circuit is used to electrically connect to the intermediate sampling point of the battery cell assembly; the fourth terminal of the main protection circuit is used to electrically connect to the negative terminal of the battery cell assembly; and the fifth terminal of the main protection circuit is used to electrically connect to the voltage reference point. The main protection circuit is used to control and stop the charging or discharging operation of the battery pack when it detects that the target cell parameters of any of the battery cells meet the preset abnormal cell conditions.

8. The battery protection control circuit according to claim 7, characterized in that, The main protection circuit includes a main protection control module and a main charge / discharge control module, wherein: The first terminal of the main charge / discharge control module and the first terminal of the main protection control module are electrically connected to the first terminal of the redundant protection circuit, and the first terminals of the main charge / discharge control module and the main protection control module are also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main charge / discharge control module is electrically connected to the second terminal of the main protection control module; the third terminal of the main charge / discharge control module is electrically connected to the third terminal of the main protection control module; the fourth terminals of the main charge / discharge control module and the main protection control module are both used to electrically connect to the negative terminal of the cell assembly and the voltage reference point; the fifth terminal of the main protection control module is used to electrically connect to the intermediate sampling point of the cell assembly; the sixth terminal of the main protection control module is used to electrically connect to the positive terminal of the cell assembly. The main protection control module is used to output a main protection control signal to the main charge and discharge control module when it detects that the target cell parameters of any of the battery cells meet the abnormal conditions of the battery cells, so as to control the main charge and discharge control module to shut down, thereby controlling the cessation of charging or discharging operations for the battery pack; wherein, the main protection control signal includes a main charging protection control signal or a main discharging protection control signal.

9. The battery protection control circuit according to claim 8, characterized in that, The main charge / discharge control module includes a main charge control unit and a main discharge control unit, wherein: The first terminal of the main charging control unit is electrically connected to the first terminal of the main protection control module and the first terminal of the redundant protection circuit, and the first terminal of the main charging control unit is also used to electrically connect to the negative terminal of the battery pack; the second terminal of the main charging control unit is electrically connected to the second terminal of the main protection control module; the first terminal of the main discharging control unit is used to electrically connect to the negative terminal of the battery cell group and the voltage reference point; the second terminal of the main discharging control unit is electrically connected to the third terminal of the main protection control module; the third terminal of the main charging control unit is electrically connected to the third terminal of the main discharging control unit. The main protection control module is used to output the main charging protection control signal to the main charging control unit when it detects that the charging voltage of any of the battery cells is greater than the preset charging protection voltage, so as to control the main charging control unit to shut down, thereby controlling the cessation of charging operation for the battery pack. The main protection control module is further configured to output the main discharge protection control signal to the main discharge control unit when it detects that the discharge voltage of any of the battery cells is greater than the preset discharge protection voltage, so as to control the main discharge control unit to shut down, thereby controlling the cessation of the discharge operation on the battery pack.

10. A portable power bank, characterized in that, The power bank includes a battery pack and a battery protection control circuit for the battery pack as described in any one of claims 1-9.

Images