Battery protection chip and battery device

Abstract

This application relates to a battery protection chip and a battery device, including a signal generation circuit, a detection circuit, a logic drive circuit, and a control switch. The signal generation circuit generates a detection signal and sends it to the detection circuit and the logic drive circuit. There are two or more detection signals, which are used to control the detection circuit to enter the detection state corresponding to the detection signal in a time-sharing manner. When the detection circuit receives a detection signal, it enters the detection state corresponding to the detection signal. When it determines that the battery's working state is not normal, it outputs an indication signal to the logic drive circuit. The logic drive circuit generates a drive signal based on the detection signal and the indication signal, which drives the control switch to switch between open and closed states, cutting off or connecting the charging circuit or discharging circuit between the battery and the external device. Since the detection circuit only detects the detection state corresponding to the signal in working state at the same time, other detection states do not need to continuously consume battery power, thus solving the problem of high power consumption of current battery protection chips.

Description

Technical Field

[0001] This application relates to the field of lithium battery protection technology, and in particular to a battery protection chip and battery device. Background Technology

[0002] With the development of electronic technology, lithium batteries have entered a stage of large-scale practical application, becoming an essential power source for various devices. Their application is particularly widespread in areas where device size is limited, due to their ability to be miniaturized. For example, in smart wearable devices such as smartwatches, fitness trackers, and Bluetooth headsets, the capacity of lithium batteries may only be tens of mAh, or even as low as a few mAh.

[0003] Currently, battery protection chips are typically used to monitor and protect lithium batteries during the charging and discharging process, promptly disconnecting the battery from external devices when abnormal charging or discharging occurs. However, traditional methods for detecting charging and discharging abnormalities employ real-time detection, meaning the corresponding detection circuitry remains operational throughout the charging and discharging process, continuously consuming battery power and resulting in high power consumption. This approach fails to meet the demands of small-capacity batteries in various smart wearable devices. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery protection chip and battery device to address the problem of high power consumption in current battery protection chips.

[0005] A battery protection chip includes a signal generation circuit, a detection circuit, a logic driving circuit, and a control switch. The signal generation circuit is connected to the detection circuit and the logic driving circuit. The detection circuit is connected to the logic driving circuit and the battery. The control switch is disposed in the charging and discharging circuit between the battery and an external device and is connected to the logic driving circuit.

[0006] The signal generation circuit is used to generate a detection signal and send the detection signal to the detection circuit and the logic driving circuit; the number of the detection signals is two or more, which are used to time-division control the detection circuit to enter the detection state corresponding to the detection signal;

[0007] When the detection circuit receives the detection signal, it enters the detection state corresponding to the detection signal to detect the operating parameters of the battery, and outputs an indication signal to the logic drive circuit according to the operating parameters of the battery.

[0008] The logic driving circuit generates a driving signal based on the detection signal and the indication signal; the driving signal is used to drive the control switch to switch between open and closed states.

[0009] In one embodiment, the battery protection chip further includes a reference circuit, which is connected to the signal generation circuit and the detection circuit;

[0010] The signal generation circuit is further configured to generate a reference enable signal based on the detection signal, and send the reference enable signal to the reference circuit;

[0011] When the reference circuit receives the reference enable signal, it generates reference parameters for the detection circuit.

[0012] In one embodiment, the detection signals include an overcharge detection signal, an over-discharge detection signal, a charging overcurrent detection signal, and a discharging overcurrent detection signal; the detection circuit includes a charging / discharging overcurrent detection circuit and an overcharge / over-discharge detection circuit, the charging / discharging overcurrent detection circuit being connected to the signal generation circuit, the reference circuit, and the logic driving circuit, and the overcharge / over-discharge detection circuit being connected to the signal generation circuit, the reference circuit, the battery, and the logic driving circuit;

[0013] The charge / discharge overcurrent detection circuit is used to detect the current parameters of the battery when it receives the charging overcurrent detection signal or the discharging overcurrent detection signal, and output an overcurrent indication signal to the logic drive circuit according to the current parameters of the battery.

[0014] The overcharge and over-discharge detection circuit is used to detect the voltage parameters of the battery when it receives the overcharge detection signal or the over-discharge detection signal, and output an overvoltage indication signal to the logic drive circuit according to the voltage parameters of the battery.

[0015] In one embodiment, the overcharge and over-discharge detection circuit includes a voltage divider circuit and a voltage detection circuit. The voltage divider circuit is connected to the battery, the signal generation circuit, and the voltage detection circuit. The voltage detection circuit is connected to the signal generation circuit, the reference circuit, and the logic drive circuit.

[0016] In one embodiment, the voltage detection circuit includes a first data selector, a voltage comparator, and a first logic OR gate. The first data selector is connected to the voltage divider circuit, the signal generation circuit, and the voltage comparator. The voltage comparator is connected to the reference circuit, the first logic OR gate, and the logic driver circuit. The first logic OR gate is connected to the signal generation circuit.

[0017] In one embodiment, the charge / discharge overcurrent detection circuit includes a first switch, a second switch, a first resistor, a second resistor, a current comparator, and a second logic OR gate. The control units of the first switch and the second switch are connected to the signal generation circuit. The first switch is connected in series in the connection line between the reference circuit and the first terminal of the current comparator. The second switch is connected in series in the connection line between the reference circuit and the second terminal of the current comparator. The first terminal of the current comparator is also grounded through the first resistor. The second terminal of the current comparator is also connected to the negative terminal of the charge / discharge circuit through the second resistor. The second logic OR gate is connected to the signal generation circuit and the third terminal of the current comparator. The fourth terminal of the current comparator is connected to the logic driving circuit.

[0018] In one embodiment, the logic driving circuit includes a voltage comparator output circuit, a current comparator output circuit, and a drive output circuit. The voltage comparator output circuit is connected to the signal generation circuit, the voltage comparator, and the drive output circuit. The current comparator output circuit is connected to the signal generation circuit, the current comparator, and the drive output circuit. The drive output circuit is connected to the control switch.

[0019] In one embodiment, when the control switch is a single power transistor structure, the logic drive circuit further includes a substrate selection circuit, which is connected to the drive output circuit and the control switch.

[0020] In one embodiment, the signal generation circuit includes a clock circuit and a state machine, the clock circuit being connected to the state machine, and the state machine being connected to the detection circuit and the logic driving circuit.

[0021] In one embodiment, a battery device is provided, including a battery and the aforementioned battery protection chip, wherein the battery is connected to the battery protection chip.

[0022] The aforementioned battery protection chip and battery device, through the signal generation circuit, output multiple detection signals to control the detection circuit to enter the detection state corresponding to the detection signal in a time-division manner. The detection circuit detects and outputs an indication signal to the logic drive circuit according to the battery's operating parameters. The logic drive circuit then generates a drive signal based on the detection signal and the indication signal, driving the control switch to switch on and off states, thereby realizing the battery protection function. Since the detection circuit only detects the detection state corresponding to the signal in working state at any given time, all detection states do not need to continuously consume battery power, thus solving the problem of high power consumption of current battery protection chips. Attached Figure Description

[0023] Figure 1 This is a system block diagram of a battery protection chip in one embodiment;

[0024] Figure 2 This is a structural diagram of the battery device in one embodiment;

[0025] Figure 3 This is a timing diagram of the detection signal in one embodiment;

[0026] Figure 4 This is a circuit diagram of a voltage detection circuit in one embodiment;

[0027] Figure 5 This is a circuit diagram of the voltage detection circuit in another embodiment;

[0028] Figure 6 This is a circuit diagram of a charge / discharge overcurrent detection circuit in one embodiment;

[0029] Figure 7 This is a circuit diagram of the charge / discharge overcurrent detection circuit in another embodiment;

[0030] Figure 8 This is a schematic diagram of the current comparator in one embodiment;

[0031] Figure 9 This is a schematic diagram of shutting off the charging circuit in one embodiment;

[0032] Figure 10 This is a schematic diagram of shutting off the discharge circuit in one embodiment. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0035] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0036] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0037] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0038] As described in the background section, lithium batteries are widely used in applications where device size is limited due to their miniaturization capability. For example, smartwatches, fitness trackers, and Bluetooth headsets often use lithium batteries with capacities of only tens of mAh, or even as low as a few mAh. To ensure safety during use, battery protection chips are typically used to monitor and protect the lithium battery during charging and discharging, promptly disconnecting the battery from external devices in case of abnormal charging or discharging. However, traditional methods for detecting charging and discharging anomalies employ real-time detection, meaning the corresponding detection circuitry is constantly operating during charging and discharging, continuously consuming battery power and resulting in high power consumption, which cannot meet the small-capacity battery requirements of various smart wearable devices. Furthermore, the individual detection functions within the existing detection circuitry also operate independently, consuming battery power and contributing to high power consumption.

[0039] Based on this, in one embodiment, such as Figure 1 As shown, a battery protection chip 100 is provided, including a signal generation circuit 110, a detection circuit 120, a logic drive circuit 130, and a control switch 140. The signal generation circuit 110 is connected to the detection circuit 120 and the logic drive circuit 130. The detection circuit 120 is connected to the logic drive circuit 130 and the battery 200. The control switch 140 is disposed in the charging and discharging circuit between the battery 200 and an external device, and is connected to the logic drive circuit 130. The signal generation circuit 110 is used to generate a detection signal and send the detection signal to the detection circuit 120 and the logic drive circuit 130. There are two or more detection signals, which are used to control the detection circuit 120 to enter the detection state corresponding to the detection signal in a time-sharing manner. When the detection circuit 120 receives a detection signal, it enters the detection state corresponding to the detection signal to detect the battery's operating parameters, and outputs an indication signal to the logic drive circuit 130 according to the battery's operating parameters. The logic drive circuit 130 generates a drive signal according to the detection signal and the indication signal. The drive signal is used to drive the control switch 140 to switch between open and closed states.

[0040] Among them, such as Figure 2 As shown, battery 200 (Li-battery) includes a positive terminal B+ and a negative terminal B-. The positive terminal B+ and the negative terminal B- of battery 200 are connected to external devices via external positive terminals P+ and P-, respectively. The external devices connected to battery 200 via these two external terminals are not limited to one type; they can be connected to a load to form a discharge circuit, using battery 200 to power the load; or they can be connected to an external charging device to form a charging circuit, using the external charging device to charge battery 200.

[0041] Control switch 140 is located on the connection line between the main positive terminal B+ of battery 200 and the external positive terminal P+, or on the connection line between the main negative terminal B- and the external negative terminal P-, and is used to control whether the discharge circuit or charging circuit between battery 200 and external device is open. When control switch 140 is on, the discharge circuit or charging circuit between battery 200 and external device is connected, which can be used to supply power to the load or charge it using an external charging device; when control switch 140 is off, the discharge circuit or charging circuit between battery 200 and external device is disconnected, and it is impossible to supply power to the load or charge it using an external charging device. The number of control switches 140 is not unique, and can be as follows: Figure 1 The control switch 140 shown uses a single power transistor structure to disconnect the battery 200 from the discharge or charging circuit of an external device. Alternatively, it could be as follows... Figure 2 The power transistors Q1 and Q2, which employ a dual power transistor structure, control the disconnection of the discharge circuit or charging circuit between the battery 200 and the external device, respectively.

[0042] It is understood that the battery protection chip 100 uses a signal generation circuit 110, a detection circuit 120 and a logic drive circuit 130 to output drive signals to control the switch 140 to switch its open and closed state, so as to achieve the purpose of monitoring and managing the working state of the battery pack 200.

[0043] Specifically, the signal generation circuit 110 generates a detection signal for the time-division control detection circuit 120 to enter the corresponding detection state. It can be understood that the time-division control detection circuit 120 entering the corresponding detection state means that the detection circuit 120 is not continuously in operation. It only enters the detection state corresponding to the received detection signal; when no detection signal is received, the detection circuit 120 is inactive. Furthermore, all detection signals are timing signals. A high level for any detection signal indicates that the detection circuit 120 has received a detection signal and needs to enter the detection state corresponding to that high-level detection signal; all low-level detection signals indicate that the detection circuit 120 has not received a detection signal and is inactive. Therefore, the operating time of the detection circuit 120 is the sum of the pulse widths of each detection signal, and the inactive time of the detection circuit 120 is the duration during which all detection signals are in a low-level state. Therefore, by using time-division detection technology, the current consumed by the detection circuit during operation is allowed to be slightly higher than that in the prior art, which can achieve a larger bandwidth and better noise suppression capability. Meanwhile, the detection circuit does not work for most of the time during the entire working cycle, so the average current of the entire cycle can also be very small, thereby achieving extremely low power consumption of the battery protection chip as a whole.

[0044] The content and quantity of the detection signals need to be determined based on the detection states of the detection circuit 120. In the embodiments of this application, the explanation is based on the example that the detection circuit 120 includes four detection states that may occur during the charging and discharging process of the battery 200: overcharging, over-discharging, charging overcurrent, and discharging overcurrent. Correspondingly, as... Figure 3 As shown, the signal generation circuit 110 can generate an overcharge detection signal (OV_DET), an over-discharge detection signal (UV_DET), a charging overcurrent detection signal (COC_DET), or a discharging overcurrent detection signal (DOC_DET), and output them to the detection circuit 120 to control it to enter the corresponding detection state. For example, when OV_DET is high, the detection circuit 120 enters the overcharge detection state; when UV_DET is high, the detection circuit 120 enters the over-discharge detection state; when DOC_DET is high, the detection circuit 120 enters the discharging overcurrent detection state; and when COC_DET is high, the detection circuit 120 enters the charging overcurrent detection state. Figure 3 It can be seen that in order to enable the time-division control detection circuit 120 to enter its detection state, the signal generation circuit 110 generates two or more detection signals, only one of which is in a high-level state at the same time. When one of the detection signals is in a high-level state, the other detection signals are in a low-level state.

[0045] The structure of the signal generation circuit 110 is not unique; it can be implemented using a square wave generator or a controller with a timer and register. In one embodiment, such as... Figure 1 As shown, the signal generation circuit 110 includes a clock circuit and a state machine. The clock circuit is connected to the state machine, and the state machine is connected to the detection circuit and the logic drive circuit. The clock circuit generates a clock signal with a fixed pulse width and frequency, and inputs this clock signal to the state machine. The state machine is used to divide the clock signal to generate signals of different frequencies. Then, through combinational logic operations on the signals of different frequencies, the state machine generates detection signals such as OV_DET, UV_DET, DOC_DET, and COC_DET, which are output to the detection circuit 120.

[0046] It is understandable that the pulse width of all detection signals can be set to be consistent. However, since different detection states in the detection circuit 120 require different delay lengths to ensure detection accuracy, corresponding to different detection frequencies, the state machine needs to divide the clock signal according to the detection frequency corresponding to different detection states. For example, the overcharge protection delay in the overcharge detection state is the longest, so a lower detection frequency can be used, while the discharge overcurrent detection or charging overcurrent detection requires a slightly higher detection frequency. In addition, to ensure that the drive of the control switch in the detection state will not produce large errors due to the protection delay, the detection frequency corresponding to the detection signal can be set to a value one order of magnitude (about 10 times) smaller than the delay time. The specific delay time and detection frequency corresponding to the above detection states can be set according to the actual protection chip. Figure 3 As shown, taking this embodiment as an example, which includes four detection states: overcharge, over-discharge, charging overcurrent, and discharging overcurrent, the overcharge protection delay corresponding to OV_DET (overcharge detection state) can be set to 100ms, and the detection frequency can be set to 10ms; the over-discharge protection delay corresponding to UV_DET (over-discharge detection state) can be set to 40ms, and the detection frequency can be set to 4ms; the protection delays corresponding to DOC_DET (discharge overcurrent detection state) and COC_DET (charging overcurrent detection state) can be set to 10ms, and the detection frequency can be set to 1ms. Furthermore, based on the corresponding detection frequencies, a time difference needs to be added to each detection signal to ensure that only one signal is in a high-level state at any given time. For example... Figure 3 The diagram illustrates the changes in the detection signal over two cycles. In this embodiment, a clock circuit and a state machine are used to generate two or more detection signals that alternately cycle through each other, thereby achieving time-division detection of each detection state of the detection circuit.

[0047] Furthermore, upon receiving a detection signal, the detection circuit 120 enters the detection state corresponding to the detection signal to detect the operating parameters of the battery 200 and outputs an indication signal based on the battery's operating parameters. The operating parameters of the battery 200 can be determined based on the detection state of the detection circuit 120. For example, in overcharge and over-discharge detection states, the battery's voltage parameter can be detected; in overcurrent charging, overcurrent discharging, and short-circuit discharging detection states, the battery's current parameter can be detected. Correspondingly, the indication signal can also be determined based on the battery's operating parameters. For example, it can include an overvoltage indication signal output based on the voltage parameter, or an overcurrent indication signal output based on the current parameter.

[0048] After receiving the indication signal, the logic drive circuit 130 performs logical operations based on the detection signal and the indication signal to output a drive signal, which drives the control switch 140 to switch between open and closed states. The detection signal is used to determine the current detection state of the detection circuit 120, and the indication signal is used to determine whether an error exists or has been resolved in the current detection state. When the detection signal and indication signal determine that an error exists or has not been resolved in the current detection state, the output drive signal drives the control switch 140 to the open state; when the detection signal and indication signal determine that no error exists or has been resolved in the current detection state, the output drive signal drives the control switch 140 to the on state.

[0049] Furthermore, when the battery 200 is in a normal charging and discharging process, each detection signal alternately cycles through the detection circuit 120 according to the time sequence output by the state machine to enter the corresponding detection state. However, after the logic drive circuit 130 determines that there is an error in the current detection state based on the detection signal and the indication signal, the state machine only outputs the detection signal corresponding to that detection state to the detection circuit 120. This continues until the logic drive circuit 130 determines that the error in the current detection state has been resolved based on the detection signal and the indication signal. Only then do the detection signals alternately cycle through the detection circuit 120 according to the time sequence output by the state machine to enter the corresponding detection state and detect the operating parameters of the battery 200.

[0050] The aforementioned battery protection chip uses a signal generation circuit to output multiple detection signals to control the detection circuit to enter the detection state corresponding to the detection signal in a time-division manner. The detection circuit detects and outputs an indication signal to the logic drive circuit according to the battery's operating parameters. The logic drive circuit then generates a drive signal based on the detection signal and the indication signal, which drives the control switch to switch on and off states, thereby realizing the battery protection function. Since the detection circuit only detects the detection state corresponding to the signal that is in working state at any given time, all detection states do not need to continuously consume battery power, thus solving the problem of high power consumption of current battery protection chips.

[0051] In one embodiment, such as Figure 1As shown, the battery protection chip 100 also includes a reference circuit 150, which is connected to the signal generation circuit 110 and the detection circuit 120. The signal generation circuit 110 is also used to generate a reference enable signal based on the detection signal and send the reference enable signal to the reference circuit 150. When the reference circuit 150 receives the reference enable signal, it generates reference parameters to the detection circuit 120.

[0052] Specifically, when any of the generated detection signals is in a high-level state, the signal generation circuit 110 generates a reference enable signal (EN_REF) and sends it to the reference circuit 150, so that the reference circuit 150 generates reference parameters and sends them to the detection circuit 120. The type of reference parameters can be determined according to the type of operating parameters of the detected battery, such as a reference voltage or a reference current. It can be understood that the reference parameters are voltage or current signals that do not change over time. Whether a reference voltage or a reference current is sent to the detection circuit 120 depends on the type of detection signal. For example, when the detection signal is an overcharge detection signal (OV_DET) or an over-discharge detection signal (UV_DET), the reference circuit 150 generates a reference voltage and sends it to the detection circuit 120; when the detection signal is a charging overcurrent detection signal (COC_DET) or a discharging overcurrent detection signal (DOC_DET), the reference circuit 150 generates a reference current and sends it to the detection circuit 120. The specific value of the reference voltage or reference current is not unique and can be set according to the operating parameters of the battery 200 and the protection threshold.

[0053] In this embodiment, the reference circuit is controlled by outputting a reference enable signal to issue reference parameters only during the detection circuit's operating time, further reducing the power consumption of the battery protection chip.

[0054] In one embodiment, the detection signals include an overcharge detection signal, an over-discharge detection signal, a charging overcurrent detection signal, and a discharging overcurrent detection signal; the detection circuit 120 includes a charging / discharging overcurrent detection circuit and an overcharge / over-discharge detection circuit. The charging / discharging overcurrent detection circuit is connected to the signal generation circuit 110, the reference circuit 150, and the logic drive circuit 130, while the overcharge / over-discharge detection circuit is connected to the signal generation circuit 110, the reference circuit 150, the battery 200, and the logic drive circuit 130. The charging / discharging overcurrent detection circuit detects the battery's current parameters upon receiving a charging overcurrent detection signal or a discharging overcurrent detection signal, and outputs an overcurrent indication signal to the logic drive circuit 130 based on the battery's current parameters. The overcharge / over-discharge detection circuit detects the battery's voltage parameters upon receiving an overcharge detection signal or an over-discharge detection signal, and outputs an overvoltage indication signal to the logic drive circuit 130 based on the battery's voltage parameters.

[0055] In this embodiment, taking the detection circuit 120 as an example, which includes four detection states that may occur during the charging and discharging process of the battery 200: overcharging, over-discharging, charging overcurrent, and discharging overcurrent, the detection circuit 120 uses an overcharge and over-discharge detection circuit to simultaneously multiplex the overcharge and over-discharge detection states, and uses a charging overcurrent detection circuit to simultaneously multiplex the charging overcurrent and discharging overcurrent detection states. Compared with the prior art, which requires four comparison circuits to complete the four detection states of overcharging, over-discharging, charging overcurrent, and discharging overcurrent, this reduces power consumption and saves chip area.

[0056] In one embodiment, the overcharge and over-discharge detection circuit includes a voltage divider circuit and a voltage detection circuit. The voltage divider circuit is connected to the battery, the signal generation circuit, and the voltage detection circuit. The voltage detection circuit is connected to the signal generation circuit, the reference circuit, and the logic drive circuit.

[0057] Specifically, such as Figure 1 and Figure 2 As shown, the voltage divider circuit consists of two or more resistors connected in series. One end of the series connection is connected to the positive terminal B+ of the battery 200 through the VDD terminal of the battery protection chip to obtain the voltage of the battery 200. The other end of the series connection is grounded. When the overcharge detection signal (OV_DET) or over-discharge detection signal (UV_DET) generated by the signal generation circuit 110 is in a high-level state, it generates an overcharge and over-discharge enable signal (EN_VDD_DIV) and sends it to the voltage divider circuit. This causes the voltage divider circuit to perform voltage division according to the obtained battery voltage parameters, and outputs the overcharge judgment voltage (VDD_DIV_OV) and the over-discharge judgment voltage (VDD_DIV_UV) to the voltage detection circuit through the common terminal of the series resistors.

[0058] The voltage detection circuit is used to acquire the overcharge judgment voltage divider (VDD_DIV_OV) when an overcharge detection signal is received, and output an overvoltage indication signal based on the overcharge judgment voltage divider (VDD_DIV_OV) and the reference voltage; the voltage detection circuit is also used to acquire the over-discharge judgment voltage divider (VDD_DIV_UV) when an over-discharge detection signal is received, and output an overvoltage indication signal based on the over-discharge judgment voltage divider (VDD_DIV_UV) and the reference voltage.

[0059] In one embodiment, such as Figure 4 As shown, the voltage detection circuit includes a first data selector mux2_3, a voltage comparator, and a first logic OR gate OR1. The first data selector mux2_3 is connected to a voltage divider circuit, a signal generation circuit, and a voltage comparator. The voltage comparator is connected to a reference circuit, the first logic OR gate OR1, and a logic driver circuit. The first logic OR gate is connected to the signal generation circuit.

[0060] In this embodiment, the output of the first data selector mux2_3 can be connected to either the non-inverting or inverting input of the voltage comparator, and correspondingly, the reference circuit can be connected to either the inverting or non-inverting input of the voltage comparator. This can be configured according to actual conditions and is not limited. In this example, the output of the first data selector mux2_3 is connected to the non-inverting input of the voltage comparator, and the reference circuit is connected to the inverting input of the voltage comparator.

[0061] Specifically, the first logic OR gate OR1 receives the overcharge detection signal (OV_DET) and the over-discharge detection signal (UV_DET), and outputs a voltage comparator enable signal based on these signals to control the operating state of the voltage comparator. When either the overcharge detection signal (OV_DET) or the over-discharge detection signal (UV_DET) is high, the first logic OR gate OR1 outputs the voltage comparator enable signal, controlling the voltage comparator to operate.

[0062] Furthermore, upon receiving the overcharge detection signal (OV_DET), the first data selector mux2_3 selects channel 1 to obtain the overcharge judgment voltage divider (VDD_DIV_OV) and outputs it to the non-inverting input of the voltage comparator. The voltage comparator compares the overcharge judgment voltage divider (VDD_DIV_OV) with the reference voltage (VREF) input to the inverting input and outputs an overvoltage indication signal, which is further used to output to the drive signal to determine whether there is an error in the current detection state. When the overcharge judgment voltage divider (VDD_DIV_OV) is less than the reference voltage (VREF), the output overvoltage indication signal is low; when the overcharge judgment voltage divider (VDD_DIV_OV) is greater than or equal to the reference voltage (VREF) and its duration is longer than the overcharge protection delay, the output overvoltage indication signal is high.

[0063] Upon receiving the over-discharge detection signal (UV_DET), the first data selector mux2_3 selects channel 2 to obtain the over-discharge judgment voltage divider (VDD_DIV_UV) and outputs it to the non-inverting input of the voltage comparator. The voltage comparator compares the over-discharge judgment voltage divider (VDD_DIV_UV) with the reference voltage (VREF) input to the inverting input and outputs an overvoltage indication signal. When the over-discharge judgment voltage divider (VDD_DIV_UV) is greater than the reference voltage (VREF), the output overvoltage indication signal is high; when the over-discharge judgment voltage divider (VDD_DIV_UV) is less than or equal to the reference voltage (VREF) and the duration is longer than the over-discharge protection delay, the output overvoltage indication signal is low.

[0064] In addition, when the voltage detection circuit outputs an overvoltage indication signal, and the logic drive circuit 130 determines that there is an error in the current detection state based on the detection signal and the indication signal, the voltage detection circuit can determine when to restore the battery to a normal state based on whether a load or an external charging device is connected.

[0065] In one embodiment, the voltage divider circuit is further configured to generate overcharge recovery judgment voltage divider (VDD_DIV_OVhys) and over-discharge recovery judgment voltage divider (VDD_DIV_UVhys) based on the battery voltage upon receiving an overcharge / over-discharge enable signal. Figure 5 As shown, the voltage detection circuit also includes an external device detection circuit, a second data selector mux2_1, and a third data selector mux2_2. The external device detection circuit is connected to the second data selector mux2_1 and the third data selector mux2_2. Both the second data selector mux2_1 and the third data selector mux2_2 are connected to a voltage divider circuit and a first data selector mux2_3. The external device detection circuit can output a load access signal (Loader_IN) to the control terminal of the second data selector mux2_1 when a load is connected, and it can also output a charging device access signal (Charger_IN) to the control terminal of the third data selector mux2_2 when an external charging device is connected. The input terminal of the second data selector mux2_1 is connected to the voltage divider circuit to select the overcharge judgment voltage divider (VDD_DIV_OV) or the overcharge recovery judgment voltage divider (VDD_DIV_OVhys), and inputs the selected voltage divider to channel 1 of the first data selector mux2_3. The input of the third data selector mux2_2 is connected to the voltage divider circuit to select the over-discharge judgment voltage divider (VDD_DIV_UV) or the over-discharge recovery judgment voltage divider (VDD_DIV_UVhys), and the selected voltage divider is input to channel 2 of the first data selector mux2_3.

[0066] Specifically, when an overcharge detection error is detected, the system can restore the battery to normal operation in two ways, depending on whether the load access signal (Loader_IN) is connected. When load access is detected, the load access signal (Loader_IN) is high, and the second data selector mux2_1 selects channel 1 to obtain the overcharge judgment voltage divider (VDD_DIV_OV) and outputs it to channel 1 of the first data selector mux2_3. Then, upon receiving the overcharge detection signal (OV_DET), the first data selector mux2_3 selects channel 1 to obtain the overcharge judgment voltage divider (VDD_DIV_OV) and outputs it to the non-inverting input of the voltage comparator. This voltage is compared with the reference voltage (VREF) to output an overvoltage indication signal. At this time, both the threshold for determining whether the battery can be restored to normal operation and the threshold for determining whether it is in an overcharge state are the overcharge judgment voltage divider (VDD_DIV_OV), with no hysteresis voltage. When no load is detected, the load access signal (Loader_IN) is low. The second data selector mux2_1 selects channel 2 to obtain the overcharge recovery judgment voltage divider (VDD_DIV_OVhys) and outputs it to channel 1 of the first data selector mux2_3. At this time, the threshold used to determine whether the battery's operating state can be restored to the normal state becomes the overcharge recovery judgment voltage divider (VDD_DIV_OVhys), which has a hysteresis voltage compared to the overcharge judgment voltage divider (VDD_DIV_OV).

[0067] Furthermore, if an error is detected in the over-discharge detection state, the system can restore the battery to normal operation in two ways, depending on whether the charging device access signal (Charger_IN) is connected. When an external charging device is detected, the charging device access signal (Charger_IN) is high, and the third data selector mux2_2 selects channel 1 to obtain the over-discharge judgment voltage divider (VDD_DIV_UV) and outputs it to channel 2 of the first data selector mux2_3. Then, upon receiving the over-discharge detection signal (UV_DET), the first data selector mux2_3 selects channel 2 to obtain the over-discharge judgment voltage divider (VDD_DIV_UV) and outputs it to the non-inverting input of the voltage comparator. This voltage is compared with the reference voltage (VREF) to determine and output an overvoltage indication signal. At this time, the threshold used to determine whether the battery's operating state can be restored to normal and the threshold used to determine whether it is in an over-discharge state are both the over-discharge judgment voltage divider (VDD_DIV_UV), with no hysteresis voltage. When no external charging device is detected, the charging device access signal (Charger_IN) is low. The third data selector mux2_2 selects channel 2 to obtain the over-discharge recovery judgment voltage divider (VDD_DIV_UVhys) and outputs it to channel 1 of the first data selector mux2_3. At this time, the threshold used to determine whether the battery's operating state can be restored to the normal state becomes the over-discharge recovery judgment voltage divider (VDD_DIV_UVhys), which has a hysteresis voltage compared to the over-discharge judgment voltage divider (VDD_DIV_UV).

[0068] The values ​​of the overcharge judgment voltage (VDD_DIV_OV), over-discharge judgment voltage (VDD_DIV_UV), overcharge recovery judgment voltage (VDD_DIV_OVhys), and over-discharge recovery judgment voltage (VDD_DIV_UVhys) output by the voltage divider circuit are not fixed and can be determined according to the protection threshold set for the battery. For example, in this embodiment, assuming VREF = 1V, VDD_DIV_UV = 0.357*VDD, VDD_DIV_Uvhys = 0.333*VDD, VDD_DIV_OV = 0.233*VDD, and VDD_DIV_Ovhys = 0.244*VDD. Furthermore, when the system enters the overcharge state and no load is detected, the Loader_IN signal is low. Data selector mux2_1 selects channel 2 and compares the VDD_DIV_UVhys signal with VREF. At this time, 0.333*VDD = 1V, resulting in an overcharge recovery voltage of 4.1V. After a load is detected, the Loader_IN signal is high. Data selector mux2_2 selects channel 1 and compares the VDD_DIV_OV signal with VREF. At this time, 0.233*VDD = 1V, resulting in an overcharge recovery voltage of 4.3V, which is equal to the overcharge protection voltage value without hysteresis. When the system enters the over-discharge state and no external charging device is detected, the Charger_IN signal is low. Data selector mux2_1 selects channel 2 and compares the VDD_DIV_UVhys signal with VREF. At this time, 0.333*VDD = 1V, resulting in an overcharge recovery voltage of 3V. After detecting the connection of an external charging device, the Charger_IN signal is high. The data selector mux2_2 selects channel 1 and sends the VDD_DIV_UV signal to be compared with VREF. At this time, 0.357*VDD=1V, and the over-discharge recovery voltage is 2.8V, which is equal to the over-discharge protection voltage value and there is no hysteresis voltage.

[0069] In one embodiment, such as Figure 5 As shown, the charge / discharge overcurrent detection circuit includes a first switch S1, a second switch S2, a first resistor R1, a second resistor R2, a current comparator, and a second logic OR gate OR2. The control units of the first switch S1 and the second switch S2 are connected to the signal generation circuit. The first switch S1 is connected in series in the connection line between the reference circuit and the first terminal of the current comparator. The second switch S2 is connected in series in the connection line between the reference circuit and the second terminal of the current comparator. The first terminal of the current comparator is also grounded through the first resistor R1. The second terminal of the current comparator is also connected to the negative terminal of the charge / discharge circuit through the second resistor R2. The second logic OR gate OR2 is connected to the signal generation circuit and the third terminal of the current comparator. The fourth terminal of the current comparator is connected to the logic drive circuit.

[0070] In this embodiment, the first terminal of the current comparator can be either the in-phase or out-of-phase terminal, and correspondingly, the second terminal of the current comparator can be either the in-phase or out-of-phase terminal, which can be set according to the actual situation and is not limited. In this embodiment, the first terminal of the current comparator is the out-of-phase terminal and the second terminal of the current comparator is the in-phase terminal for explanation. The control terminal of the first switch S1 is connected to the discharge overcurrent detection signal (DOC_DET), and the control terminal of the second switch S2 is connected to the charging overcurrent detection signal (COC_DET).

[0071] Specifically, the second logic OR gate OR2 receives the charging overcurrent detection signal (COC_DET) and the discharging overcurrent detection signal (DOC_DET), and outputs a current comparator enable signal based on these signals to control the operating state of the current comparator. When either the charging overcurrent detection signal (COC_DET) or the discharging overcurrent detection signal (DOC_DET) is high, the second logic OR gate OR2 outputs the current comparator enable signal, controlling the current comparator to operate.

[0072] Furthermore, upon receiving the discharge overcurrent detection signal (DOC_DET), the first switch S1 is turned on, and the reference current IREF flows through the first resistor R1. The current comparator compares the voltage value at the negative terminal of the charging / discharging circuit with the voltage value of the reference current IREF flowing through the first resistor R1, and outputs an overcurrent indication signal. When the voltage value at the negative terminal of the charging / discharging circuit is less than the voltage value of the reference current IREF flowing through the first resistor R1, the output overcurrent indication signal is low; when the voltage value at the negative terminal of the charging / discharging circuit is greater than or equal to the voltage value of the reference current IREF flowing through the first resistor R1 and the duration is longer than the discharge overcurrent protection delay, the output overcurrent indication signal is high.

[0073] Upon receiving the charging overcurrent detection signal (COC_DET), the second switch S2 is turned on, allowing the reference current IREF to flow through the second resistor R2. The current comparator compares the voltage value at the negative terminal of the charging / discharging circuit with the voltage value of the reference current IREF flowing through the second resistor R2, and outputs an overcurrent indication signal. The overcurrent indication signal is high when the voltage value at the negative terminal of the charging / discharging circuit is greater than the voltage value of the reference current IREF flowing through the second resistor R2; and it is high when the voltage value at the negative terminal of the charging / discharging circuit is less than or equal to the voltage value of the reference current IREF flowing through the second resistor R2 for a duration longer than the charging overcurrent protection delay.

[0074] In one embodiment, the current comparator can be implemented using a common-gate comparator as shown in Figure 7, or it can be implemented using... Figure 8 The common-source comparator implementation shown above operates on the same control principle as described above, and will not be repeated here.

[0075] In one embodiment, the logic driving circuit includes a voltage comparator output circuit, a current comparator output circuit, and a drive output circuit. The voltage comparator output circuit is connected to the signal generation circuit, the voltage comparator, and the drive output circuit. The current comparator output circuit is connected to the signal generation circuit, the current comparator, and the drive output circuit. The drive output circuit is connected to a control switch.

[0076] Specifically, such as Figure 4 or Figure 5 As shown, the voltage comparator output circuit performs logical operations based on the detection signal and the overvoltage indication signal to output a drive signal. The voltage comparator output circuit uses a first logic AND gate (AND1) to determine the output overcharge drive signal (OV) based on the overcharge detection signal (OV_DET) and the overvoltage indication signal. The voltage comparator output circuit also uses a first logic NOT gate (NOT1) and a second logic AND gate (AND2) to determine the output over-discharge drive signal (UV) based on the over-discharge detection signal (UV_DET) and the overvoltage indication signal.

[0077] In this circuit, the first input of the first AND gate AND1 is connected to a signal generation circuit to receive an overcharge detection signal (OV_DET), the second input of the first AND gate AND1 is connected to the output of a voltage comparator to receive an overvoltage indication signal, and the output of the first AND gate AND1 is connected to a drive output circuit. When the overcharge detection signal (OV_DET) is high and the overvoltage indication signal output by the voltage comparator is high, the first AND gate AND1 outputs an overcharge drive signal (OV) high to drive the output circuit.

[0078] The input of the first NOT gate (NOT1) is connected to the output of the voltage comparator to receive the overvoltage indication signal. The output of the first NOT gate (NOT1) is connected to the first input of the second AND gate (AND2). The second input of the second AND gate (AND2) is connected to the signal generation circuit to receive the over-discharge detection signal (UV_DET). The output of the second AND gate (AND2) is connected to the drive output circuit. When the over-discharge detection signal (UV_DET) is high and the overvoltage indication signal output by the voltage comparator is low, the first AND gate (AND1) outputs an over-discharge drive signal (UV) high to the drive output circuit.

[0079] Furthermore, such as Figure 6As shown, the current comparator output circuit performs logical operations based on the detection signal and the overcurrent indication signal to output a drive signal. The current comparator output circuit uses a third logic AND gate (AND3) to determine the output of a discharge overcurrent drive signal (DOC) based on the discharge overcurrent detection signal (DOC_DET) and the overcurrent indication signal. The current comparator output circuit also uses a second logic NOT gate (NOT2) and a fourth logic AND gate (AND4) to determine the output of a charging overcurrent drive signal (COC) based on the charging overcurrent detection signal (COC_DET) and the overcurrent indication signal.

[0080] In this circuit, the first input of the third AND gate AND3 is connected to a signal generation circuit to receive the discharge overcurrent detection signal (DOC_DET). The second input of the third AND gate AND3 is connected to the output of a current comparator to receive the overcurrent indication signal. The output of the third AND gate AND3 is connected to a drive output circuit. When the discharge overcurrent detection signal (DOC_DET) is high and the overcurrent indication signal output by the current comparator is high, the third AND gate AND3 outputs a discharge overcurrent drive signal (DOC) that is high, driving the output circuit.

[0081] The input of the second NOT gate (NOT2) is connected to the output of the current comparator to receive the overcurrent indication signal. The output of the second NOT gate (NOT2) is connected to the first input of the fourth AND gate (AND4). The second input of the fourth AND gate (AND4) is connected to the signal generation circuit to receive the charging overcurrent detection signal (COC_DET). The output of the fourth AND gate (AND4) is connected to the drive output circuit. When the charging overcurrent detection signal (COC_DET) is high and the overcurrent indication signal output by the current comparator is low, the fourth AND gate (AND4) outputs a charging overcurrent drive signal (COC) high to drive the output circuit.

[0082] Furthermore, the drive output circuit receives the drive signals output by the voltage comparator output circuit and the current comparator output circuit respectively, and determines the output total drive signal to the control switch. Specifically, when any of the received overcharge drive signal (OV), overdischarge drive signal (UV), charging overcurrent drive signal (COC), and discharging overcurrent drive signal (DOC) is high, the drive control switch switches to the off state, cutting off the charging and discharging circuit between the battery and the external device. When all of the received overcharge drive signal (OV), overdischarge drive signal (UV), charging overcurrent drive signal (COC), and discharging overcurrent drive signal (DOC) are low, the drive control switch switches to the on state, connecting the charging and discharging circuit between the battery and the external device.

[0083] It is understandable that, based on the detection and indication signals, if the current detection state is determined to be either overcharge detection or overcurrent detection, and an error exists or has not been resolved, the drive output circuit can output a drive signal to cut off the charging circuit between the battery and the external device, while maintaining the discharging circuit. Conversely, if, based on the detection and indication signals, the current detection state is determined to be either over-discharge detection or overcurrent detection, and an error exists or has not been resolved, the drive output circuit can output a drive signal to cut off the discharging circuit between the battery and the external device, while maintaining the charging circuit. The specific implementation method is not unique and can be determined based on the type of control switch.

[0084] In one embodiment, when the control switch is as follows Figure 1 In the single-power transistor structure shown, the logic drive circuit also includes a substrate selection circuit, which connects the drive output circuit and the control switch.

[0085] Specifically, when the received overcharge drive signal (OV) or overcharge drive signal (COC) is high, the drive output circuit first outputs a drive signal to the gate of the single power transistor through output terminal 1, driving the single power transistor to switch to the off state. Further, the overcharge drive signal (OV) or overcharge drive signal (COC) is also used to output to the substrate selection circuit, so that the substrate selection circuit outputs a substrate selection signal through output terminal 2, connecting the substrate of the single power transistor to terminal VM, maintaining the discharge circuit and cutting off the charging circuit, such as... Figure 9 As shown.

[0086] When the received over-discharge drive signal (UV) or over-discharge drive signal (DOC) is high, the drive output circuit first outputs a drive signal to the gate of the single power transistor through output terminal 1, driving the single power transistor to switch to the off state. Further, the over-discharge drive signal (UV) or over-discharge drive signal (DOC) is also used to output to the substrate selection circuit, so that the substrate selection circuit outputs a substrate selection signal through output terminal 2, connecting the substrate of the single power transistor to terminal GND, maintaining the discharge circuit and cutting off the charging circuit, such as... Figure 10 As shown.

[0087] In one embodiment, such as Figure 2As shown, the control switch is a dual-power transistor structure, including power transistor Q1 and power transistor Q2. Specifically, when the received overcharge drive signal (OV) or charging overcurrent drive signal (COC) is high, the drive output circuit first outputs a drive signal to the gate of power transistor Q2 through output terminal 1 (DO terminal), driving power transistor Q2 to switch to the off state and cut off the charging circuit. The discharge circuit can be retained through the parasitic diode of power transistor Q2 and power transistor Q1. When the received overdischarge drive signal (UV) or discharging overcurrent drive signal (DOC) is high, the drive output circuit first outputs a drive signal to the gate of power transistor Q1 through output terminal 2 (CO terminal), driving power transistor Q1 to switch to the off state and cut off the discharge circuit. The charging circuit can be retained through the parasitic diode of power transistor Q1 and power transistor Q2.

[0088] In one embodiment, such as Figure 2 As shown, a battery device is provided, including a battery and the aforementioned battery protection chip, wherein the battery is connected to the battery protection chip.

[0089] Specifically, the battery device includes a positive terminal B+ and a negative terminal B-. The positive terminal B+ and the negative terminal B- are connected to external devices via external positive terminals P+ and P-, respectively. The external devices connected to the battery via these two external terminals are not limited to one type; they can be connected to a load to form a discharge circuit, using the battery to power the load; or they can be connected to an external charging device to form a charging circuit, using the external charging device to charge the battery.

[0090] The control switch of the battery protection chip is located on the connection line between the battery's main positive terminal B+ and the external positive terminal P+, or on the connection line between the main negative terminal B- and the external negative terminal P-. It is used to control whether the discharge or charging circuit between the battery and external devices is open or closed. In essence, the battery protection chip uses a signal generation circuit, a detection circuit, and a logic drive circuit to output a drive signal to control the switch to switch its on / off state, thereby achieving the purpose of monitoring and managing the working status of the battery pack.

[0091] For specific limitations in the battery device embodiments, please refer to the limitations on the battery protection chip mentioned above, which will not be repeated here.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery protection chip, characterized in that, It includes a signal generation circuit, a detection circuit, a logic drive circuit, and a control switch. The signal generation circuit is connected to the detection circuit and the logic drive circuit. The detection circuit is connected to the logic drive circuit and the battery. The control switch is located in the charging and discharging circuit between the battery and the external device and is connected to the logic drive circuit. The signal generation circuit is used to generate a detection signal and send the detection signal to the detection circuit and the logic driving circuit; the number of the detection signals is two or more, used to time-division control the detection circuit to enter the detection state corresponding to the detection signal; the detection signals include overcharge detection signal, over-discharge detection signal, charging overcurrent detection signal and discharging overcurrent detection signal; When the detection circuit receives the detection signal, it enters the detection state corresponding to the detection signal to detect the operating parameters of the battery, and outputs an indication signal to the logic drive circuit according to the operating parameters of the battery. The detection circuit is in a non-operational state when it does not receive the detection signal; The detection circuit includes a charge / discharge overcurrent detection circuit and an overcharge / over-discharge detection circuit. The charge / discharge overcurrent detection circuit can simultaneously reuse the two detection states of charging overcurrent and discharging overcurrent, and the overcharge / over-discharge detection circuit can simultaneously reuse the two detection states of overcharging and over-discharging. The logic driving circuit generates a driving signal based on the detection signal and the indication signal; the driving signal is used to drive the control switch to switch between open and closed states.

2. The battery protection chip according to claim 1, characterized in that, The battery protection chip also includes a reference circuit, which is connected to the signal generation circuit and the detection circuit. The signal generation circuit is further configured to generate a reference enable signal based on the detection signal, and send the reference enable signal to the reference circuit; When the reference circuit receives the reference enable signal, it generates reference parameters for the detection circuit.

3. The battery protection chip according to claim 2, characterized in that, The charge / discharge overcurrent detection circuit is connected to the signal generation circuit, the reference circuit, and the logic drive circuit; the overcharge / overdischarge detection circuit is connected to the signal generation circuit, the reference circuit, the battery, and the logic drive circuit. The charge / discharge overcurrent detection circuit is used to detect the current parameters of the battery when it receives the charging overcurrent detection signal or the discharging overcurrent detection signal, and output an overcurrent indication signal to the logic drive circuit according to the current parameters of the battery. The overcharge and over-discharge detection circuit is used to detect the voltage parameters of the battery when it receives the overcharge detection signal or the over-discharge detection signal, and output an overvoltage indication signal to the logic drive circuit according to the voltage parameters of the battery.

4. The battery protection chip according to claim 3, characterized in that, The overcharge and over-discharge detection circuit includes a voltage divider circuit and a voltage detection circuit. The voltage divider circuit is connected to the battery, the signal generation circuit, and the voltage detection circuit. The voltage detection circuit is connected to the signal generation circuit, the reference circuit, and the logic drive circuit.

5. The battery protection chip according to claim 4, characterized in that, The voltage detection circuit includes a first data selector, a voltage comparator, and a first logic OR gate. The first data selector is connected to the voltage divider circuit, the signal generation circuit, and the voltage comparator. The voltage comparator is connected to the reference circuit, the first logic OR gate, and the logic driver circuit. The first logic OR gate is connected to the signal generation circuit.

6. The battery protection chip according to claim 5, characterized in that, The charge / discharge overcurrent detection circuit includes a first switch, a second switch, a first resistor, a second resistor, a current comparator, and a second logic OR gate. The control units of the first switch and the second switch are connected to the signal generation circuit. The first switch is connected in series in the connection line between the reference circuit and the first terminal of the current comparator. The second switch is connected in series in the connection line between the reference circuit and the second terminal of the current comparator. The first terminal of the current comparator is also grounded through the first resistor. The second terminal of the current comparator is also connected to the negative terminal of the charge / discharge circuit through the second resistor. The second logic OR gate is connected to the signal generation circuit and the third terminal of the current comparator. The fourth terminal of the current comparator is connected to the logic driving circuit.

7. The battery protection chip according to claim 6, characterized in that, The logic driving circuit includes a voltage comparator output circuit, a current comparator output circuit, and a drive output circuit. The voltage comparator output circuit is connected to the signal generation circuit, the voltage comparator, and the drive output circuit. The current comparator output circuit is connected to the signal generation circuit, the current comparator, and the drive output circuit. The drive output circuit is connected to the control switch.

8. The battery protection chip according to claim 7, characterized in that, When the control switch is a single power transistor structure, the logic drive circuit further includes a substrate selection circuit, which is connected to the drive output circuit and the control switch.

9. The battery protection chip according to any one of claims 1 to 8, characterized in that, The signal generation circuit includes a clock circuit and a state machine. The clock circuit is connected to the state machine, and the state machine is connected to the detection circuit and the logic driving circuit.

10. A battery device, characterized in that, The battery includes a battery and a battery protection chip as described in any one of claims 1 to 9, wherein the battery is connected to the battery protection chip.

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