Charging control circuit and method and battery module

Abstract

The invention provides a charging control circuit and method and a battery module. A charging detection module of the charging control circuit is used for detecting charging parameters of an energy storage device and outputting a detection signal; the time delay module is connected with the charging detection module, and the time delay module is used for acquiring the detection signal and outputting a time delay detection signal after continuously acquiring the detection signal for a preset time length; the control module is connected with the time delay module, and the control module is used for obtaining the time delay detection signal and controlling the energy storage device to be switched between a charging state and a non-charging state based on the time delay detection signal; the charging parameters of the energy storage device are detected through the charging detection module, and the charging state of the energy storage device is adjusted according to the charging parameters, so that intelligent charging control over the energy storage device is achieved. And the delay module outputs the delay detection signal after continuously acquiring the detection signal for the preset duration, so that the situation of misjudgment of the control module caused by abnormal change of voltage and current of the battery module is avoided, and the charging safety and stability are improved.

Description

Technical Field

[0001] This application belongs to the field of battery charging technology, and in particular relates to a charging control circuit and method, and a battery module. Background Technology

[0002] As the core energy storage component of various electronic devices, energy storage systems, and power units, the stability and safety of the charging process of batteries directly affect the service life and operational reliability of the equipment.

[0003] In related technologies, transient load changes often occur, causing the battery to output a large current instantaneously. This voltage distortion caused by the transient current can easily lead the charging control circuit to misjudge the battery's true state: even if the actual battery voltage is still at a high level and has not reached the recharge trigger condition, the distorted sampled voltage may be lower than the recharge threshold, thus falsely triggering the recharge mechanism; or during charging, fluctuations in the sampled signal caused by the transient current may cause the circuit to misjudge charging completion or charging abnormality, leading to frequent switching between charging and non-charging states. This frequent state switching caused by false triggering reduces the reliability and safety of the battery charging system. Summary of the Invention

[0004] The purpose of this application is to provide a charging control circuit and method, and a battery module, which aims to solve the problem of low safety in charging control circuits in traditional technologies.

[0005] A first aspect of this application provides a charging control circuit for controlling the switching of an energy storage device between a charging state and a non-charging state; the charging control circuit includes: A charging detection module is used to detect the charging parameters of the energy storage device and output a detection signal based on the charging parameters; A delay module is connected to the charging detection module. The delay module is used to acquire the detection signal and output a delayed detection signal after continuously acquiring the detection signal for a preset duration. A control module, connected to the delay module, is used to acquire the delay detection signal and control the energy storage device to switch between charging and non-charging states based on the delay detection signal.

[0006] In some embodiments of this application, the charging parameters include charging current, and the charging detection module is used to detect the charging current of the energy storage device in the charging state, and output a first detection signal when the charging current is less than a preset current; The delay module is used to output a first delayed detection signal to the control module after continuously acquiring the first detection signal for a first preset time. The control module controls the energy storage device to switch from the charging state to the non-charging state based on the first delayed detection signal.

[0007] In some embodiments of this application, the charging detection module includes a first comparator, which has a first input terminal, a second input terminal, and a first output terminal. The first input terminal is a positive input terminal, the second input terminal is a negative input terminal, the first input terminal is used to receive a preset current signal, the second input terminal is used to receive a charging current signal, and the first output terminal is used to output the first detection signal.

[0008] In some embodiments of this application, the control module includes a first trigger, which is used to output a first control signal based on the first delay detection signal. The first control signal is used to control the energy storage device to switch from the charging state to the non-charging state.

[0009] In some embodiments of this application, the first preset duration is at least 100ms.

[0010] In some embodiments of this application, the charging parameters further include a supply voltage, and the charging detection module is used to detect the supply voltage of the energy storage device in the non-charging state, and output a second detection signal when the supply voltage is less than a preset voltage; The delay module is used to output a second delayed detection signal to the control module after continuously acquiring the detection signal for a second preset duration. The control module controls the energy storage device to switch from the non-charging state to the charging state based on the second delayed detection signal.

[0011] In some embodiments of this application, the charging detection module includes a second comparator, which has a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal is a positive input terminal, and the fourth input terminal is a negative input terminal. The third input terminal is used to connect to a preset voltage signal, and the fourth input terminal is used to connect to a power supply voltage signal. The second output terminal is used to output the second detection signal.

[0012] In some embodiments of this application, the control module further includes a second trigger, which is used to output a second control signal based on the second delay detection signal. The second control signal is used to control the energy storage device to switch from the non-charging state to the charging state.

[0013] In some embodiments of this application, the second preset duration is at least 1 second.

[0014] A second aspect of this application also provides a charging control method, which is applied to the charging control circuit described above, and the charging control method includes: The charging parameters of the energy storage device are obtained, and a detection signal is output based on the charging parameters; After continuously acquiring the detection signal for a preset duration, a delayed detection signal is output. The delay detection signal is acquired, and the energy storage device is controlled to switch between charging and non-charging states based on the delay detection signal.

[0015] In some embodiments of this application, the charging control method includes: The charging current of the energy storage device is acquired during the charging state, and a first detection signal is output based on the charging current; After continuously acquiring the first detection signal for a first preset duration, a first delayed detection signal is output. The first delay detection signal is acquired, and the energy storage device is controlled to switch from the charging state to the non-charging state based on the first delay detection signal.

[0016] In some embodiments of this application, the step of obtaining the charging current of the energy storage device in the charging state further includes: The energy storage device is charged using trickle current constant current during the charging state; The power supply voltage of the energy storage device is obtained. If the power supply voltage is greater than the preset voltage, the voltage is adjusted to a constant voltage to charge the energy storage device.

[0017] In some embodiments of this application, the step of charging the energy storage device using trickle current constant current during the charging state further includes: The duration of trickle-current constant flow applied to the energy storage device is obtained. If the duration exceeds a preset value, the energy storage device is switched to the non-charging state.

[0018] In some embodiments of this application, the charging control method includes: The power supply voltage of the energy storage device is detected in the non-charging state, and a second detection signal is output when the power supply voltage is less than a preset voltage. After continuously acquiring the second detection signal for a second preset duration, a second delayed detection signal is output. The second delay detection signal is acquired, and the energy storage device is controlled to switch from the non-charging state to the charging state based on the second delay detection signal.

[0019] A third aspect of this application also provides a battery module, including a battery and a charging control circuit as described above, wherein the battery is an energy storage device and the charging control circuit is used to control the charging state of the battery.

[0020] The beneficial effects of this application are as follows: In the charging control circuit and method and battery module of this application, the charging control circuit is used to control the switching of the energy storage device between the charging state and the non-charging state; the charging control circuit includes a charging detection module, a delay module, and a control module; the charging detection module is used to detect the charging parameters of the energy storage device and output a detection signal based on the charging parameters; the delay module is connected to the charging detection module, and the delay module is used to acquire the detection signal and output a delayed detection signal after continuously acquiring the detection signal for a preset time; the control module is connected to the delay module, and the control module is used to acquire the delayed detection signal and control the switching of the energy storage device between the charging state and the non-charging state based on the delayed detection signal; this application detects the charging parameters of the energy storage device through the charging detection module and adjusts the charging state of the energy storage device according to the charging parameters to achieve intelligent charging control of the energy storage device; and by outputting the delayed detection signal only after continuously acquiring the detection signal for a preset time through the delay module, it is beneficial to avoid the situation where the control module misjudges due to transient large current, which is beneficial to improving the charging safety and stability of the energy storage device. Attached Figure Description

[0021] Figure 1 A schematic diagram of the framework structure of a charging control circuit provided in an embodiment of this application; Figure 2 A schematic diagram of the circuit structure of a charging control circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of the steps of a charging control method provided in an embodiment of this application; Figure 4 This is a schematic diagram of the steps of a charging control method provided in another embodiment of this application; Figure 5 A schematic diagram illustrating the steps of a charging control method provided in another embodiment of this application; Figure 6 This is a schematic diagram of the steps of a charging control method provided in another embodiment of this application.

[0022] Specific element symbol explanations: 100 - Energy storage device, 200 - Detection module, 300 - Delay module, 400 - Control module, CMP1 - Second comparator, DFF1 - Second flip-flop, Delay1 - Second delay unit, CMP2 - First comparator, DFF2 - First flip-flop, Delay2 - First delay unit, RECHG_REF - Preset voltage signal, VFB - Power supply voltage signal, RECHG - Second control signal, TERMCC_REF - Preset current signal, ISNS_AVE - Charging current signal, TERM_CHG - First control signal. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by 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 are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] It's important to understand that batteries, as the core energy storage component in various electronic devices, energy storage systems, and power units, directly impact the lifespan and operational reliability of these devices due to the stability and safety of their charging process. In a battery charging system, when the battery voltage reaches a preset full-charge threshold and the charging current drops below the termination current threshold, the charging control circuit stops charging and enters the charging complete state. If the battery voltage subsequently drops below the recharge threshold, the circuit triggers a recharge mechanism to restart the charging process, maintaining the battery's charge level and ensuring the device's continuous power supply capability.

[0027] However, in real-world applications, transient load changes often occur, causing the battery to output a large current instantaneously. Due to the battery's internal resistance and the line impedance between the battery and the detection port of the charging control circuit, a significant voltage drop occurs when a transient large current passes through these impedances. This causes the battery sampling voltage collected by the charging detection module to be significantly lower than the battery's actual voltage. This sampling voltage distortion caused by transient large currents can easily lead the charging control circuit to misjudge the battery's true state: even if the actual battery voltage is still at a high level and the recharge trigger condition has not been met, the distorted sampling voltage may be lower than the recharge threshold, thus falsely triggering the recharge mechanism. Alternatively, during charging, fluctuations in the sampling signal caused by transient large currents can cause the circuit to misjudge charging completion or charging abnormality, leading to frequent switching between charging and non-charging states. These frequent state switching caused by false triggers can disrupt the charging system's operation, affecting charging efficiency and potentially causing battery thermal management failure, accelerating battery wear, shortening battery life, and in severe cases, even leading to safety hazards such as battery overheating and bulging, thus restricting the reliability and safety of the battery charging system.

[0028] Based on this, this application addresses traditional charging control circuits and methods, and battery modules.

[0029] Please see Figure 1 , Figure 1 This is a schematic diagram of the framework structure of the charging control circuit provided in this embodiment. The charging control circuit of this embodiment is used to control the energy storage device 100 to switch between a charging state and a non-charging state. The charging control circuit includes a charging detection module 200, a delay module 300, and a control module 400. The charging detection module 200 is used to detect the charging parameters of the energy storage device 100 and output a detection signal based on the charging parameters. The delay module 300 is connected to the charging detection module 200 and is used to acquire the detection signal and output a delayed detection signal after continuously acquiring the detection signal for a preset time. The control module 400 is connected to the delay module 300 and is used to acquire the delayed detection signal and control the energy storage device 100 to switch between a charging state and a non-charging state based on the delayed detection signal.

[0030] It should be explained that the charging control circuit is a dedicated circuit used to regulate the charging state of the energy storage device 100. By detecting charging parameters and executing control logic, it achieves precise switching between charging and non-charging states. The energy storage device 100 is a device capable of storing electrical energy and releasing it on demand, such as a battery or supercapacitor. Its charging process requires the control circuit to ensure safety and stability. The charging state is the operating mode in which the energy storage device 100 receives and stores electrical energy. In this state, the control circuit allows charging current input until the preset charging completion condition is reached. The non-charging state is the mode in which the energy storage device 100 stops receiving electrical energy, including the standby state after charging is complete or the waiting state before recharging, to avoid overcharging or accidental charging.

[0031] The charging detection module 200 is the signal acquisition unit of the charging control circuit, used to monitor the charging-related parameters of the energy storage device 100 and convert the physical parameters into electrical signals for output. Charging parameters are key indicators reflecting the charging state of the energy storage device 100, such as terminal voltage and charging current. The detection signal is the electrical signal output by the charging detection module 200, corresponding to the charging parameters. The delay module 300 is a circuit unit with signal delay output function. After receiving the detection signal, it does not output it immediately, but transmits the signal after a preset time. The delayed detection signal is the signal processed by the delay module 300, eliminating the influence of transient interference and more accurately reflecting the actual charging state of the energy storage device 100. The control module 400 is the core decision-making unit of the charging control circuit. Based on the delayed detection signal, it executes preset logic and outputs control commands to switch the charging state.

[0032] It is understood that the delay module 300 in this embodiment needs to continuously acquire the detection signal for a preset time before outputting the delayed detection signal. This can filter out instantaneous signal changes caused by interference such as transient large currents, prevent the control module 400 from misjudging, and avoid frequent switching between charging and non-charging states. Furthermore, by accurately detecting charging parameters and verifying them through delay, it ensures that the switching of charging states conforms to the actual situation of the energy storage device 100, avoiding risks such as device overheating and damage caused by overcharging or improper recharging, and ensuring safe use.

[0033] In some embodiments of this application, the charging parameters include the charging current. The charging detection module 200 is used to detect the charging current of the energy storage device 100 in the charging state, and outputs a first detection signal when the charging current is less than a preset current. The delay module 300 is used to output a first delayed detection signal to the control module 400 after continuously acquiring the first detection signal for a first preset time. The control module 400 controls the energy storage device 100 to switch from the charging state to the non-charging state based on the first delayed detection signal.

[0034] It needs to be explained that the charging current is the current flowing into the energy storage device 100 during charging. It is a core parameter reflecting the charging progress and status, and its magnitude directly relates to whether charging is nearing completion. The preset current is a pre-set current threshold used to determine whether the energy storage device 100 has met the conditions for charging completion. The first detection signal is an electrical signal output by the charging detection module 200 when the charging current is less than the preset current, clearly indicating that the charging current has met the current condition for charging completion. The first preset duration is a delay duration set by the delay module 300 for the first detection signal, used to verify whether the state of the charging current being less than the preset current is stable and to filter out instantaneous fluctuations. The first delayed detection signal is a signal output by the delay module 300 after continuously acquiring the first detection signal for the full first preset duration, ensuring that the charging current remains stable at a low level.

[0035] It is understood that in this embodiment, the delay module 300 needs to continuously acquire the first detection signal for a full first preset time before outputting the first delayed detection signal. This avoids premature termination of charging due to a sudden drop in charging current, ensuring that the energy storage device 100 is charged to a preset level. By verifying the signal stability over the first preset time, interference from instantaneous current fluctuations during charging is filtered out, preventing the control module 400 from misjudging charging completion and reducing invalid switching between charging and non-charging states. Simultaneously, it avoids frequent recharging caused by premature termination of charging, reducing the number of charging cycles for the energy storage device 100, preventing inconvenience caused by insufficient charging, and extending the overall lifespan of the device.

[0036] In some embodiments of this application, please refer to Figure 2 , Figure 2 A schematic diagram of the circuit structure of the charging control circuit provided in this embodiment is shown. The charging detection module 200 of this embodiment includes a first comparator CMP2. The first comparator CMP2 has a first input terminal, a second input terminal and a first output terminal. The first input terminal is a positive input terminal and the second input terminal is a negative input terminal. The first input terminal is used to connect to a preset current signal TERMCC_REF, the second input terminal is used to connect to a charging current signal ISNS_AVE, and the first output terminal is used to output a first detection signal.

[0037] It should be explained that the first comparator CMP2 is the core signal processing device of the charging detection module 200, which outputs a logic signal by comparing the amplitudes of the electrical signals at its two input terminals. The positive input terminal (first input terminal) is one of the comparator's signal receiving terminals, used to receive the electrical signal corresponding to a preset current, serving as a reference terminal for current judgment; its signal amplitude is relatively stable. The negative input terminal (second input terminal) is the other signal receiving terminal of the comparator, used to receive the electrical signal corresponding to the real-time charging current; it is the target signal terminal being detected, and its signal amplitude varies with the charging current. The preset current signal TERMCC_REF is an electrical signal corresponding to a preset current threshold, which can be generated by the reference circuit; its amplitude is stable and serves as a reference for judging whether the charging current has reached the charging completion condition. The charging current signal ISNS_AVE is an electrical signal that reflects the magnitude of the charging current of the energy storage device 100 in real time; it is generated by the current sampling circuit, and its amplitude is positively correlated with the charging current. The first output terminal is the signal output interface of the first comparator CMP2, which outputs a first detection signal based on the signal comparison results at the positive and negative input terminals.

[0038] It is understood that in this embodiment, the first comparator CMP2 directly compares the preset current signal TERMCC_REF with the charging current signal ISNS_AVE, avoiding errors from intermediate signal conversion. This allows for quick and accurate identification of whether the charging current is less than the preset current, providing a precise trigger condition for charging termination. Furthermore, the first comparator CMP2 has a fast response characteristic, capable of capturing changes in the charging current in real time and outputting corresponding detection signals. This ensures that subsequent delay procedures are triggered promptly when the charging current is stably lower than the preset current, guaranteeing the timeliness of charging control.

[0039] Please refer to the embodiments described in this application. Figure 2 The control module 400 in this embodiment includes a first trigger DFF2. The first trigger DFF2 is used to output a first control signal TERM_CHG based on a first delay detection signal. The first control signal TERM_CHG is used to control the energy storage device 100 to switch from a charging state to a non-charging state.

[0040] It should be explained that the first flip-flop DFF2 is the core logic device of the control module 400, possessing signal triggering and state latching functions. It can output a stable control signal based on the input delay detection signal. State latching means that once the first delay detection signal is received and the first control signal TERM_CHG is output, the output state is maintained to avoid repeated state switching caused by signal fluctuations. The first control signal TERM_CHG is the control instruction output by the first flip-flop DFF2, used to explicitly instruct the energy storage device 100 to switch its operating state.

[0041] It is understood that the first trigger DFF2 in this embodiment has a state latching function, maintaining a fixed state after outputting the first control signal TERM_CHG to prevent the energy storage device 100 from repeatedly switching between charging and non-charging states due to subsequent signal fluctuations. Furthermore, the first trigger DFF2 only responds to the first delayed detection signal that has been verified by delay, filtering out invalid or interference signals to ensure that the output first control signal TERM_CHG accurately corresponds to the actual charging state of the energy storage device 100. Simultaneously, the first trigger DFF2 quickly responds to the first delayed detection signal and promptly outputs the first control signal TERM_CHG to cut off the charging circuit, ensuring that the energy storage device 100 is fully charged while avoiding the risk of overcharging, thus guaranteeing charging safety.

[0042] In some embodiments of this application, the first preset duration is at least 100ms.

[0043] It is understandable that setting a delay duration of more than 100ms in this embodiment can effectively eliminate interference from short-term current fluctuations, avoid false triggering of charging termination due to instantaneous current drop, and ensure the reliability of the judgment.

[0044] In some embodiments of this application, the charging parameters also include the supply voltage. The charging detection module 200 is used to detect the supply voltage of the energy storage device 100 in the non-charging state, and outputs a second detection signal when the supply voltage is less than a preset voltage. The delay module 300 is used to output a second delayed detection signal to the control module 400 after continuously acquiring the detection signal for a second preset time. The control module 400 controls the energy storage device 100 to switch from the non-charging state to the charging state based on the second delayed detection signal.

[0045] It should be explained that the supply voltage is the terminal voltage of the energy storage device 100 when it outputs electrical energy. It is a core indicator reflecting the remaining power of the energy storage device 100, and its value change directly determines whether recharging needs to be initiated. The preset voltage is a pre-set voltage threshold used to determine whether the energy storage device 100 has met the recharging conditions. It is a key reference standard for triggering the switch from the non-charging state to the charging state. The second detection signal is an electrical signal output by the charging detection module 200 when the supply voltage is lower than the preset voltage, clearly indicating that the remaining power of the energy storage device 100 is insufficient and recharging needs to be initiated. The second preset duration is a delay time set by the delay module 300 for the second detection signal. It is used to verify whether the state of the supply voltage being lower than the preset voltage is stable and to filter transient voltage drop interference. The second delayed detection signal is the signal output by the delay module 300 after continuously verifying the second detection signal for the full second preset duration, ensuring that the low supply voltage state is real and effective.

[0046] It is understood that the delay module 300 in this embodiment needs to continuously acquire the second detection signal for a full second preset time before outputting the second delayed detection signal. This can filter out the instantaneous voltage drop at the sampling point caused by a sudden large current, preventing false recharging due to the transient large current pulling down the detection voltage. Furthermore, through the stability verification of the second preset time, it is ensured that the supply voltage is indeed lower than the preset voltage, so that recharging only starts when the energy storage device 100 is truly depleted, avoiding unnecessary charging cycles. At the same time, it can reduce the number of invalid recharging cycles, avoiding device damage caused by frequent charging, while ensuring timely recharging to prevent over-discharge of the energy storage device 100 and extend its overall service life.

[0047] Please refer to the embodiments described in this application. Figure 2 The charging detection module 200 in this embodiment includes a second comparator CMP1. The second comparator CMP1 has a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal is a positive input terminal, and the fourth input terminal is a negative input terminal. The third input terminal is used to connect to a preset voltage signal RECHG_REF, the fourth input terminal is used to connect to a power supply voltage signal VFB, and the second output terminal is used to output a second detection signal.

[0048] It should be explained that the second comparator CMP1 is the core component in the charging detection module 200 responsible for voltage status determination. It outputs a logic signal by comparing the amplitudes of the electrical signals at two input terminals. The positive input terminal (third input terminal) is the reference signal receiving terminal of the second comparator CMP1, used to receive the electrical signal corresponding to the preset voltage. Its amplitude is stable, providing a fixed reference standard for determining the power supply voltage status. The negative input terminal (fourth input terminal) is the target signal receiving terminal of the second comparator CMP1, used to receive the electrical signal corresponding to the real-time power supply voltage. The signal amplitude changes with the remaining charge of the energy storage device 100. The preset voltage signal RECHG_REF: This is the electrical signal corresponding to the preset recharge voltage threshold. It is generated by the reference circuit and has accurate and stable amplitude characteristics, serving as the core reference for determining whether recharging is needed. The power supply voltage signal VFB is the electrical signal that reflects the voltage at the terminals of the energy storage device 100 in real time. It is generated by the voltage sampling circuit, and its amplitude is positively correlated with the power supply voltage, directly conveying the remaining charge information of the energy storage device 100. The second output terminal is the signal output interface of the second comparator CMP1, which outputs the second detection signal based on the comparison result of the positive and negative input signals.

[0049] It is understood that the second comparator CMP1 in this embodiment directly compares the preset voltage signal RECHG_REF with the supply voltage signal VFB, reducing errors in the intermediate signal conversion stage and enabling rapid and accurate identification of whether the supply voltage is lower than the preset voltage. Furthermore, the second comparator CMP1 has a fast response characteristic, capable of capturing changes in the supply voltage in real time and outputting corresponding detection signals, ensuring that the subsequent delayed verification process is triggered promptly when the energy storage device 100 is truly de-energized, thus avoiding over-discharge.

[0050] Please refer to the embodiments described in this application. Figure 2 The control module 400 in this embodiment also includes a second trigger DFF1, which is used to output a second control signal RECHG based on a second delay detection signal. The second control signal RECHG is used to control the energy storage device 100 to switch from a non-charging state to a charging state.

[0051] It should be explained that the second flip-flop DFF1 is the core logic device of the control module 400, possessing signal triggering and state latching functions. It can output a stable control signal based on the input delay detection signal. State latching means that once the second delay detection signal is received and the second control signal RECHG is output, the output state is maintained to avoid repeated state switching caused by signal fluctuations. The second control signal RECHG is the control command output by the second flip-flop DFF1, used to explicitly instruct the energy storage device 100 to switch its operating state.

[0052] It is understood that the second trigger DFF1 in this embodiment has a state latching function, maintaining a fixed state after outputting the second control signal RECHG to prevent the energy storage device 100 from repeatedly switching between charging and non-charging states due to subsequent signal fluctuations. Furthermore, the second trigger DFF1 only responds to the second delayed detection signal that has been verified by delay, filtering out invalid or interference signals to ensure that the output second control signal RECHG accurately corresponds to the actual charging state of the energy storage device 100. Simultaneously, the second trigger DFF1 responds quickly to the second delayed detection signal, promptly outputting the second control signal RECHG to cut off the charging circuit, ensuring that the energy storage device 100 is fully charged while avoiding the risk of overcharging, thus guaranteeing charging safety.

[0053] In some embodiments of this application, the second preset duration is at least 1 second.

[0054] It is understandable that in this embodiment, a delay duration of more than 1 second is set to fully cover the duration of the load transient change, wait for the power supply voltage to return to stability, avoid false triggering of recharging due to instantaneous voltage drop, and ensure the accuracy of judgment.

[0055] Please continue reading. Figure 2 , Figure 2The upper part of the module is for recharge detection, and the lower part is for charging completion detection. The delay module 300 in this embodiment also includes a first delay unit Delay2 and a second delay unit Delay1. During normal charging, if the battery voltage feedback signal (corresponding to the supply voltage signal VFB) is detected to be greater than the recharge threshold (corresponding to the preset voltage signal RECHG_REF), then the recharge signal (corresponding to the second control signal RECHG) is low. At this time, the charging completion detection circuit is enabled by the low level of the recharge signal.

[0056] As the battery voltage approaches the constant voltage threshold, the battery charging current sampling signal (corresponding to the charging current signal ISNS_AVE) gradually decreases until it falls below the termination current threshold (corresponding to the preset current signal TERMCC_REF). At this point, the charging completion delay is activated. After the timing is complete, the input of the D flip-flop (corresponding to the first flip-flop DFF2) is high. Since the output was low in the previous moment, the D flip-flop output xQ is high, which does not affect the output of the NAND gate. When the first delay unit Delay2 transitions, the charging completion signal (corresponding to the first control signal TERM_CHG) is high, indicating that charging is complete. At this time, the D flip-flop output xQ is low, disabling the first delay unit Delay2 at the NAND gate input. The charging completion signal will only be reset when the recharge signal is high.

[0057] To prevent false triggering of recharging due to transient high current in the battery, unlike typical recharging detection which simply compares the supply voltage signal VFB with the preset voltage signal RECHG_REF, this application enables the second delay unit Delay1 to start timing when the battery voltage drops, causing the supply voltage signal VFB to fall below the preset voltage signal RECHG_REF. Before the timing is complete, if the supply voltage signal VFB cannot remain consistently below the preset voltage signal RECHG_REF, the recharging phenomenon is considered a false trigger, and the second delay unit Delay1 is reset to output a low level, keeping the recharging signal low. The preset voltage signal RECHG_REF must remain consistently below the preset voltage signal RECHG_REF during the timing of the second delay unit Delay1 for the battery voltage to be considered to have truly dropped below the recharging level. Upon the next transition of the first delay unit Delay2, the recharging signal is output as a high level, instructing the chip to perform recharging and resetting the partially completed charging portion.

[0058] Furthermore, in order to better implement the charging control circuit in any of the above embodiments, please refer to the following based on the charging control circuit described above. Figure 3 , Figure 3This embodiment illustrates the steps of the charging control method provided. This application also provides a charging control method applied to the charging control circuit described above. The charging control method includes: S100: Acquire the charging parameters of the energy storage device 100 and output a detection signal based on the charging parameters; Specifically, the detected parameters are compared with preset standards (preset current, preset voltage). When the charging parameters meet the state switching conditions (such as the charging current being less than the preset current, or the supply voltage being less than the preset voltage), the corresponding detection signal is output.

[0059] S200: Outputs a delayed detection signal after continuously acquiring the detection signal for a preset duration; Specifically, the detection signal is monitored to ensure it remains stable during the timing period. If the detection signal remains valid for a preset duration (i.e., the charging parameters continuously meet the switching conditions), it indicates that the signal reflects the true state of the energy storage device 100. After the timing ends, a delayed detection signal is output. If the signal is interrupted, the timing is reset to avoid false triggering.

[0060] S300: Acquire the delay detection signal and control the energy storage device 100 to switch between charging and non-charging states based on the delay detection signal.

[0061] Specifically, a switching command is output based on preset control logic. If the delay detection signal indicates that charging is complete (e.g., the charging current is stably lower than the preset current), the energy storage device 100 is controlled to switch from the charging state to the non-charging state; if it indicates that recharging is required (e.g., the supply voltage is stably lower than the preset voltage), it switches to the charging state, thereby realizing the orderly transition of the energy storage device 100 between the two states.

[0062] It is understood that this embodiment uses a preset time delay verification to filter transient fluctuations in charging current and supply voltage, preventing erroneous charging or termination of charging due to sudden load changes, thus ensuring the accuracy of the control logic. Furthermore, based on a stable delay detection signal switching state, it avoids overcharging, over-discharging, or frequent charging and discharging of the energy storage device 100, reducing device heat generation and wear, and extending its service life.

[0063] In some embodiments of this application, please refer to Figure 4 , Figure 4 This diagram illustrates the steps of the charging control method provided in this embodiment. The charging control method of this embodiment includes: S1: Acquire the charging current of the energy storage device 100 in the charging state, and output a first detection signal based on the charging current; Specifically, the detected charging current is compared with a preset current standard. When the charging current is less than the preset current (i.e., the current requirement for completion of charging is met), the first detection signal is immediately output to provide the original signal support for subsequent delay verification.

[0064] S2: After continuously acquiring the first detection signal for a first preset duration, output the first delayed detection signal; Specifically, during the timing period, it is confirmed whether the first detection signal remains valid. If the charging current remains below the preset current (the first detection signal is output stably), the first delayed detection signal is output after the timing ends; if the charging current rises during the timing period and the first detection signal is interrupted, the timing is reset and the system waits for a valid first detection signal again to ensure sufficient verification.

[0065] S3: Acquire the first delay detection signal, and control the energy storage device 100 to switch from the charging state to the non-charging state based on the first delay detection signal.

[0066] Specifically, the output control command disconnects the charging circuit. The energy storage device 100 smoothly switches from the charging state to the non-charging state and stops receiving electrical energy.

[0067] Understandably, this embodiment avoids premature termination of charging due to a sudden drop in charging current by setting a first preset duration for delay verification, ensuring that the energy storage device is charged to the preset level and improving the user experience. Furthermore, by continuously acquiring the first detection signal for a preset duration, transient fluctuations in current during charging are filtered out, preventing misjudgments in the control logic and reducing invalid switching between charging and non-charging states.

[0068] In some embodiments of this application, the method further includes the following step before step S1: S01: The energy storage device 100 is charged using trickle current constant current during the charging state; Specifically, a stable small current is input to the energy storage device 100. This mode can slowly activate the internal electrochemical system of the energy storage device 100, avoiding electrode damage caused by large current surges when the charge is low, while gradually increasing the supply voltage of the energy storage device 100 to prepare for subsequent mode switching.

[0069] S02: Obtain the supply voltage of the energy storage device 100. If the supply voltage is greater than the preset voltage, adjust it to a constant voltage to charge the energy storage device 100.

[0070] Specifically, the real-time supply voltage is compared with the preset voltage. If the supply voltage is greater than the preset voltage, it indicates that the energy storage device 100 has accumulated a certain amount of electricity and is capable of withstanding constant voltage charging. The charging mode is immediately adjusted to constant voltage charging to maintain a stable charging voltage, so that the charging current naturally decreases as the voltage increases.

[0071] Understandably, the low-current trickle-current constant-current charging in this embodiment avoids high-current surges when the battery is low, activates the device while reducing internal losses, and lowers the risk of damage during the initial charging phase. Furthermore, the initial trickle-current constant-current charging quickly replenishes the initial charge, while the subsequent constant-voltage charging precisely controls the voltage, enabling the energy storage device 100 to charge rapidly and reach a preset full charge state, avoiding undercharging or overcharging. Simultaneously, the energy storage device 100 has a weak ability to withstand high currents when the battery is low, and the trickle-current constant-current mode is well-suited to this characteristic; as the battery level increases, it switches to constant-voltage mode, aligning with the voltage and current handling characteristics of the energy storage device 100 during the charging process.

[0072] In some embodiments of this application, step S01 further includes: obtaining the duration of trickle constant current applied to the energy storage device 100, and if the duration exceeds a preset value, switching the energy storage device 100 to a non-charging state.

[0073] It is understood that in this embodiment, if the trickle-current constant current charging time exceeds the preset value, it indicates that the energy storage device 100 may have failed to activate or is faulty. The device should be switched to a non-charging state in a timely manner to prevent overheating, electrode wear, and other problems caused by prolonged low-efficiency charging. Furthermore, trickle-current constant current charging is terminated after the timeout to avoid continuously supplying power to the energy storage device 100 that cannot be activated normally or is faulty, thereby reducing energy waste and improving charging efficiency.

[0074] In some embodiments of this application, please refer to Figure 5 , Figure 5 This diagram illustrates the steps of the charging control method provided in this embodiment; the charging control method of this embodiment includes: S10: Detect the supply voltage of the energy storage device 100 in the non-charging state, and output a second detection signal when the supply voltage is less than the preset voltage; Specifically, the detected supply voltage is compared with a preset voltage. When the supply voltage is lower than the preset voltage, it indicates that the energy storage device 100 has insufficient remaining power, and a second detection signal is immediately output.

[0075] S20: After continuously acquiring the second detection signal for a second preset duration, output the second delayed detection signal; Specifically, during the timing period, it is confirmed whether the second detection signal remains valid. If the supply voltage remains lower than the preset voltage (the second detection signal is output stably), it indicates that the device is truly short of power, and the second delay detection signal is output after the timing ends; if the supply voltage rises during the timing period (the second detection signal is interrupted), it is determined to be a transient voltage drop, the delay module 300 resets the timing, and the second delay detection signal is not output to avoid false triggering.

[0076] S30: Acquire the second delay detection signal, and control the energy storage device 100 to switch from a non-charging state to a charging state based on the second delay detection signal.

[0077] Specifically, the output control command connects the charging circuit. The energy storage device 100 smoothly switches from a non-charging state to a charging state, enters the recharging process, and then completes the charging process according to the flow of trickle constant current charging - constant voltage charging - charging completion detection, until it switches back to a non-charging state.

[0078] It is understandable that the second preset duration delay verification in this embodiment can filter out the instantaneous voltage drop caused by sudden load changes, prevent false recharging due to the detected voltage briefly falling below the preset value, and reduce invalid charging cycles. Furthermore, by continuously acquiring the second detection signal for the preset duration, it ensures that the supply voltage is indeed stably lower than the preset voltage, and recharging is only initiated when the energy storage device 100 is truly depleted, ensuring the necessity and rationality of recharging.

[0079] Please see Figure 6 In this embodiment, after power-on, an abnormality is detected. If no abnormality is detected, the charging phase begins and the maximum charging timer is activated. If the maximum charging timer expires but charging is not completed, an abnormality is detected, and charging is immediately stopped. During charging, if the battery feedback voltage is lower than the recharge threshold, constant current charging continues until the feedback voltage is higher than the recharge threshold, at which point charging termination detection is initiated. As the battery voltage approaches the set constant voltage threshold, the charging current gradually decreases until it falls below a preset current, triggering charging termination and indicating that charging is complete and needs to be stopped. If the charger is not unplugged after charging is complete, the circuit will continuously perform recharge detection, i.e., check if the battery feedback voltage is lower than the recharge threshold. If the battery feedback voltage is detected to be lower than the recharge threshold, the recharge procedure is started; if the battery feedback voltage is higher than the recharge threshold, charging remains stopped.

[0080] Furthermore, in order to better implement the charging control circuit in any of the above embodiments, based on the charging control circuit described above, this application embodiment also provides a battery module, including a battery and the charging control circuit as described above, wherein the battery is an energy storage device 100, and the charging control circuit is used to control the charging state of the battery.

[0081] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0082] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0083] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0084] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0085] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application, and should all be included within the protection scope of this application.

Claims

1. A charging control circuit, characterized in that, Used to control the switching of energy storage devices between charging and non-charging states; The charging control circuit includes: A charging detection module is used to detect the charging parameters of the energy storage device and output a detection signal based on the charging parameters; A delay module is connected to the charging detection module. The delay module is used to acquire the detection signal and output a delayed detection signal after continuously acquiring the detection signal for a preset duration. A control module, connected to the delay module, is used to acquire the delay detection signal and control the energy storage device to switch between charging and non-charging states based on the delay detection signal.

2. The charging control circuit according to claim 1, characterized in that, The charging parameters include the charging current. The charging detection module is used to detect the charging current of the energy storage device in the charging state, and output a first detection signal when the charging current is less than a preset current. The delay module is used to output a first delayed detection signal to the control module after continuously acquiring the first detection signal for a first preset time. The control module controls the energy storage device to switch from the charging state to the non-charging state based on the first delayed detection signal. The charging detection module includes a first comparator, which has a first input terminal, a second input terminal, and a first output terminal. The first input terminal is a positive input terminal, the second input terminal is a negative input terminal, the first input terminal is used to receive a preset current signal, the second input terminal is used to receive a charging current signal, and the first output terminal is used to output the first detection signal.

3. The charging control circuit according to claim 2, characterized in that, The control module includes a first trigger, which is used to output a first control signal based on the first delay detection signal. The first control signal is used to control the energy storage device to switch from the charging state to the non-charging state. And / or, the first preset duration is at least 100ms.

4. The charging control circuit according to claim 1, characterized in that, The charging parameters also include the supply voltage. The charging detection module is used to detect the supply voltage of the energy storage device in the non-charging state, and output a second detection signal when the supply voltage is less than a preset voltage. The delay module is used to output a second delayed detection signal to the control module after continuously acquiring the detection signal for a second preset duration. The control module controls the energy storage device to switch from the non-charging state to the charging state based on the second delayed detection signal.

5. The charging control circuit according to claim 4, characterized in that, The charging control circuit satisfies at least one of the following: The charging detection module includes a second comparator, which has a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal is a positive input terminal, and the fourth input terminal is a negative input terminal. The third input terminal is used to receive a preset voltage signal, and the fourth input terminal is used to receive a power supply voltage signal. The second output terminal is used to output the second detection signal. The control module further includes a second trigger, which is used to output a second control signal based on the second delay detection signal. The second control signal is used to control the energy storage device to switch from the non-charging state to the charging state. The second preset duration is at least 1 second.

6. A charging control method, characterized in that, The charging control method is applied to the charging control circuit as described in any one of claims 1 to 5, and the charging control method includes: The charging parameters of the energy storage device are obtained, and a detection signal is output based on the charging parameters; After continuously acquiring the detection signal for a preset duration, a delayed detection signal is output. The delay detection signal is acquired, and the energy storage device is controlled to switch between charging and non-charging states based on the delay detection signal.

7. The charging control method according to claim 6, characterized in that, The charging control method includes: The charging current of the energy storage device is acquired during the charging state, and a first detection signal is output based on the charging current; After continuously acquiring the first detection signal for a first preset duration, a first delayed detection signal is output. The first delay detection signal is acquired, and the energy storage device is controlled to switch from the charging state to the non-charging state based on the first delay detection signal; And / or, the charging control method includes: The power supply voltage of the energy storage device is detected in the non-charging state, and a second detection signal is output when the power supply voltage is less than a preset voltage. After continuously acquiring the second detection signal for a second preset duration, a second delayed detection signal is output. The second delay detection signal is acquired, and the energy storage device is controlled to switch from the non-charging state to the charging state based on the second delay detection signal.

8. The charging control method according to claim 7, characterized in that, Before acquiring the charging current of the energy storage device in the charging state, the method further includes: The energy storage device is charged using trickle current constant current during the charging state; The power supply voltage of the energy storage device is obtained. If the power supply voltage is greater than the preset voltage, the voltage is adjusted to a constant voltage to charge the energy storage device.

9. The charging control method according to claim 8, characterized in that, The step of charging the energy storage device using trickle current constant current during the charging state further includes: The duration of trickle-current constant flow applied to the energy storage device is obtained. If the duration exceeds a preset value, the energy storage device is switched to the non-charging state.

10. A battery module, characterized in that, The device includes a battery and a charging control circuit as described in any one of claims 1 to 5, wherein the battery is an energy storage device and the charging control circuit is used to control the charging state of the battery.

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