A battery intelligent charging control method, system and charging device

Abstract

The present invention relates to the technical field of rechargeable batteries, and particularly to a battery intelligent charging control method, system and charging device, including configuring a charging voltage and a charging current; monitoring whether the cell voltage rises to the maximum voltage; if it rises to the maximum voltage, reducing the charging current until the cell voltage drops to the standard voltage and then restoring the rated current; monitoring the cell temperature and the PCBA temperature; judging whether the cell temperature or the PCBA temperature rises to a predetermined threshold; if it rises to the predetermined threshold, reducing the current until the cell temperature or the PCBA temperature returns to the normal temperature and then restoring the rated current. In the invention, when the voltage rises to the maximum charging voltage, the charging current is actively reduced three times until it is completely stabilized at the maximum cell voltage and the charging stops when the capacity is full. While dynamically adjusting the charging current in real time, the voltage, input current and cell temperature at the cell end are monitored in real time through a hardware circuit, solving the problems of slow charging and insecurity.

Description

Technical Field

[0001] The present invention relates to the technical field of rechargeable batteries, and particularly to a battery intelligent charging control method, system and charging device. Background Art

[0002] The existing charging control schemes are as follows: without temperature data feedback, charging with a lower current and completely ignoring the temperature of the battery cells during the charging process; with temperature data feedback, the temperature upper limit is higher than the temperature range recommended in the battery cell specification, or the temperature upper limit conforms to the battery cell specification, reducing the current after the temperature rises and not increasing the current after the temperature drops, unable to adjust dynamically in real time; when there is battery cell voltage data feedback, only the charging IC adjusts the charging current according to a fixed configuration. The above charging methods result in slow charging speed, accelerated aging of the battery cells, partial virtual power after the battery cells are fully charged, and safety problems such as easy burning of the battery shell when the ambient temperature is relatively high. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0004] The present invention provides a battery intelligent charging control method, including the following steps:

[0005] Step 1: Configure the charging voltage and charging current;

[0006] Step 2: Monitor whether the battery cell voltage rises to the maximum voltage for the first time;

[0007] Step 3: If the battery cell voltage rises to the maximum voltage for the first time, reduce the charging current until the battery cell voltage drops to the standard voltage and then restore the rated current;

[0008] Step 4: Monitor the battery cell temperature and the PCBA temperature;

[0009] Step 5: Determine whether the battery cell temperature or the PCBA temperature rises to a predetermined threshold;

[0010] Step 6: If the battery cell temperature or the PCBA temperature rises to a predetermined threshold, reduce the current until the battery cell temperature or the PCBA temperature returns to the normal temperature and then restore the rated current.

[0011] Further, Step 3 specifically includes: if the battery cell voltage rises to the maximum voltage for the first time, reduce the charging current for the first time; if the battery cell voltage rises to the maximum voltage for the second time, reduce the charging current for the second time; if the battery cell voltage rises to the maximum voltage for the third time, reduce the charging current for the third time until the battery cell voltage drops to the standard voltage and then restore the rated current.

[0012] Further, step six specifically includes: monitoring the cell temperature and the PCBA temperature, and when the current charging current is greater than the first-stage current during charging, determining whether the cell temperature or the PCBA temperature rises to the first-stage temperature; if the cell temperature or the PCBA temperature rises to the first-stage temperature, reducing the current to the first-stage current; determining whether the cell temperature or the PCBA temperature rises to the second-stage temperature; if the cell temperature or the PCBA temperature rises to the second-stage temperature, reducing the current to the second-stage current and resuming the rated current after the cell temperature or the PCBA temperature returns to the normal temperature.

[0013] Further, the second-stage current is less than the current charging current.

[0014] Further, the charging control method further includes the following steps: determining whether the cell terminal temperature or current exceeds the first-level protection range; if the cell terminal temperature or current exceeds the first-level protection range, closing the cell terminal charging bus, closing the charging IC, and the charging input bus;

[0015] Determining whether the cell terminal temperature or current exceeds the second-level protection range; if the cell terminal temperature or current exceeds the second-level protection range, fusing the fuse tube and terminating the operation;

[0016] If the cell terminal temperature or current does not exceed the second-level protection range and the cell terminal temperature or current returns to normal, resume charging.

[0017] Further, the charging control method further includes the following steps: configuring the charging voltage and charging current, configuring the charging current of the charging IC as the minimum current when the battery starts charging and linearly increasing it to the maximum current within a predetermined time; when the cell voltage is lower than the pre-charging voltage, the maximum chargeable current is one-tenth of the cell rated current; when the cell voltage is higher than the pre-charging voltage, the maximum chargeable current is the cell rated current.

[0018] The present invention also proposes a battery intelligent charging control system, including:

[0019] A main control MCU module for configuring the charging voltage and current;

[0020] A charging IC module for adjusting the charging current when the cell voltage or the cell temperature exceeds a preset threshold;

[0021] A bus switch module for switching the cell terminal charging bus, the charging IC module, and the charging input bus when the cell terminal temperature or current exceeds a predetermined threshold;

[0022] A voltage monitoring module for real-time monitoring of the cell voltage and determining the change of the cell voltage;

[0023] A temperature monitoring module for monitoring the cell temperature and the PCBA temperature and determining whether the temperature reaches a preset temperature threshold;

[0024] The protection module is used to take protection measures when the temperature and current at the battery cell end exceed the secondary protection range.

[0025] Further, the bus switch module includes a charging bus switch module for closing the charging bus at the battery cell end; and a charging input switch module for closing the charging IC module and the charging input bus.

[0026] Further, the voltage monitoring module includes a voltage sensor; and the temperature monitoring module includes a battery cell temperature sensor and a PCBA temperature sensor.

[0027] The present invention also provides a battery charging device, which includes at least one port, a memory, a processor, and a control program that can run on the memory and on the processor. When the control program is executed by the processor, the steps of the battery intelligent charging control method are implemented.

[0028] This solution charges the battery cell at the rated current. The main control MCU collects the battery cell temperature, PCBA temperature, and battery cell voltage in real time, adjusts the charging current in real time based on the above data, and uses the characteristics of the battery cell to shorten the charging duration while ensuring safety, fully charging the battery cell capacity. A hardware circuit is added at the battery cell end to cooperate with the software to monitor the voltage, current, and temperature in real time to provide two-level protection and improve the safety of battery use. Description of the Drawings

[0029] Figure 1 It is a schematic interconnection block diagram of the battery intelligent charging control system of the present invention;

[0030] Figure 2 It is a schematic flow diagram of the battery intelligent charging control method of the present invention. Detailed Embodiments

[0031] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0033] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] The present invention provides a battery intelligent discharge control method, which is applied to rechargeable batteries, specifically including all rechargeable batteries and rechargeable devices such as V-port batteries, camera batteries, N-PF batteries, and power banks.

[0037] Refer to Figure 1 , Figure 1 As a schematic block diagram of the interconnection of a battery intelligent charging control system. In this embodiment, the battery intelligent charging control system includes: a main control MCU module for configuring the charging voltage and current;

[0038] A charging IC module for adjusting the charging current when the cell voltage or cell temperature exceeds a preset threshold;

[0039] A bus switch module, which includes a charging bus switch module for closing the charging bus at the cell end; a charging input switch module for closing the charging IC module and the charging input bus;

[0040] A voltage monitoring module, including a voltage sensor, for real-time monitoring of the cell voltage and judging the change of the cell voltage;

[0041] A temperature monitoring module, including a cell temperature sensor for monitoring the cell temperature; a PCBA temperature sensor for detecting the PCBA temperature and judging whether the temperature reaches a preset temperature threshold;

[0042] A protection module for taking protection measures when the cell end temperature and current exceed the secondary protection range.

[0043] Refer to Figure 2 , Figure 2 As a schematic flowchart of a battery intelligent charging control method provided by the present invention, including the following steps:

[0044] Configure the charging voltage;

[0045] Configure the charging current;

[0046] Monitor whether the cell voltage rises to the maximum voltage for the first time;

[0047] If the cell voltage rises to the maximum voltage for the first time, reduce the charging current for the first time; if the cell voltage rises to the maximum voltage for the second time, reduce the charging current for the second time; if the cell voltage rises to the maximum voltage for the third time, reduce the charging current for the third time until the cell voltage drops to the standard voltage and then resume the rated current.

[0048] Monitor the cell temperature and the PCBA temperature;

[0049] Judge whether the cell temperature or the PCBA temperature rises to the first temperature;

[0050] When the current charging current is greater than the first-stage current during charging, judge whether the cell temperature or the PCBA temperature rises to the first-stage temperature; if the cell temperature or the PCBA temperature rises to the first-stage temperature, reduce the current to the first-stage current; judge whether the cell temperature or the PCBA temperature rises to the second-stage temperature; if the cell temperature or the PCBA temperature rises to the second-stage temperature, reduce the current to the second-stage current until the cell temperature or the PCBA temperature returns to the normal temperature and then resume the rated current, and the second-stage current is less than the current charging current.

[0051] Judge whether the cell terminal temperature or current exceeds the first-level protection range; if the cell terminal temperature or current exceeds the first-level protection range, then turn off the cell terminal charging bus, turn off the charging IC, and turn off the charging input bus;

[0052] Judge whether the cell terminal temperature or current exceeds the second-level protection range; if the cell terminal temperature or current exceeds the second-level protection range, then fuse the fuse and terminate the operation;

[0053] If the cell terminal temperature or current does not exceed the second-level protection range and the cell terminal temperature or current returns to normal, resume charging.

[0054] Another specific embodiment: When the battery starts charging, the charging IC is configured to have the lowest charging current and linearly and slowly increase it to the maximum rechargeable current within 3 seconds (the time can be adjusted according to the actual product). When the current cell voltage is lower than the pre-charge voltage, the maximum rechargeable current is one-tenth of the rated current. When the cell voltage is higher than the pre-charge voltage, the maximum rechargeable current is the rated current of the cell. The maximum charging voltage is the maximum voltage supported by the cell. At the same time, the cell temperature, PCBA temperature, and cell voltage are monitored. The cell temperature and PCBA temperature are monitored in two levels. When the temperature reaches the first-level value, the charging current is reduced to the first-level current. If the temperature continues to rise to the second-level value, the charging current is reduced to the second-level current again. If the temperature drops to the normal range, the current is restored to the rated current of the cell. When the voltage rises to the maximum charging voltage, the charging current is actively reduced three times. After the third current reduction, charging stops until it is completely stable at the maximum voltage of the cell and the capacity is 100% charged. While dynamically adjusting the charging current in real time, the software monitors the voltage, input current, and cell temperature at the cell end through the hardware circuit. When the above data is in the abnormal range of the primary protection and lasts for a certain time, the software first shuts off the charging current input bus through the hardware circuit, and then configures the charging IC data to turn off the charging function and the bus for external current input to the charging management IC. After the above abnormalities disappear and last for a period of time, the charging function will be automatically restored. If the voltage, input current, and cell temperature seriously exceed the normal range and reach the secondary protection range, the fuse for secondary protection will be triggered to melt, permanently shutting off the charge and discharge functions of the battery.

[0055] The present invention also provides a battery charging device, including at least one port, a memory, a processor, and a control program that can run on the memory and on the processor. When the control program is executed by the processor, it realizes the steps of the battery intelligent charging control method. Therefore, it at least has all the beneficial effects brought by the battery intelligent charging control method in the above embodiments, which will not be elaborated here one by one.

[0056] In addition, in each embodiment of the present invention, the functional modules can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0057] The present invention is not limited to the above specific embodiments. Those of ordinary skill in the art starting from the above concepts and making various transformations without creative labor fall within the protection scope of the present invention.

Claims

1. A battery intelligent charging control method, characterized in that, It includes the following steps: Step 1: Configure the charging voltage and charging current; Step 2: Monitor whether the cell voltage rises to the maximum voltage for the first time; Step 3: If the cell voltage rises to the maximum voltage for the first time, reduce the charging current until the cell voltage drops to the standard voltage and then restore the rated current. The specific steps include: if the cell voltage rises to the maximum voltage for the first time, reduce the charging current for the first time; if the cell voltage rises to the maximum voltage for the second time, reduce the charging current for the second time; if the cell voltage rises to the maximum voltage for the third time, reduce the charging current for the third time until the cell voltage drops to the standard voltage and then restore the rated current; Step 4: Monitor the cell temperature and the PCBA temperature; Step 5: Determine whether the cell temperature or the PCBA temperature rises to a predetermined threshold; Step 6: If the cell temperature or the PCBA temperature rises to the predetermined threshold, reduce the current until the cell temperature or the PCBA temperature returns to the normal temperature and then restore the rated current. The specific steps include: monitor the cell temperature and the PCBA temperature. When the current charging current is greater than the first-stage current during charging, determine whether the cell temperature or the PCBA temperature rises to the first-stage temperature; if the cell temperature or the PCBA temperature rises to the first-stage temperature, reduce the current to the first-stage current; determine whether the cell temperature or the PCBA temperature rises to the second-stage temperature; if the cell temperature or the PCBA temperature rises to the second-stage temperature, reduce the current to the second-stage current until the cell temperature or the PCBA temperature returns to the normal temperature and then restore the rated current; Step 7: Determine whether the cell terminal temperature or current exceeds the first-level protection range; if the cell terminal temperature or current exceeds the first-level protection range, turn off the cell terminal charging bus, turn off the charging IC, and the charging input bus; Determine whether the cell terminal temperature or current exceeds the second-level protection range; if the cell terminal temperature or current exceeds the second-level protection range, fuse the fuse and terminate the operation; If the cell terminal temperature or current does not exceed the second-level protection range and the cell terminal temperature or current returns to normal, resume charging.

2. The charging control method according to claim 1, wherein The second-stage current in the above Step 6 is less than the current charging current.

3. The charging control method according to claim 1, wherein The charging control method further includes the following steps: configure the charging voltage and charging current. When the battery starts charging, configure the charging current of the charging IC to the lowest current and linearly increase it to the maximum current within a predetermined time; when the cell voltage is lower than the pre-charge voltage, the maximum chargeable current is one-tenth of the cell rated current; when the cell voltage is higher than the pre-charge voltage, the maximum chargeable current is the cell rated current.

4. A battery intelligent charging control system for implementing the charging control method according to any one of claims 1 to 3, characterized in that It includes: The main control MCU module is used to configure the charging voltage and current; The charging IC module is used to adjust the charging current when the cell voltage or the cell temperature exceeds the preset threshold; The bus switch module is used to switch the cell terminal charging bus, the charging IC module, and the charging input bus when the cell terminal temperature or current exceeds the predetermined threshold; The voltage monitoring module is used to monitor the cell voltage in real time and judge the change of the cell voltage; The temperature monitoring module is used to monitor the cell temperature and the PCBA temperature and judge whether the temperature reaches the preset temperature threshold; The protection module is used to take protection measures when the cell terminal temperature and current exceed the second-level protection range.

5. The battery intelligent charging control system according to claim 4, characterized in that, The bus switch module includes a charging bus switch module for turning off the charging bus at the cell end; and a charging input switch module for turning off the charging IC module and the charging input bus.

6. The battery intelligent charging control system according to claim 4, wherein, The voltage monitoring module includes a voltage sensor; the temperature monitoring module includes a cell temperature sensor and a PCBA temperature sensor.

7. A battery charging device, characterized in that, It includes at least one port, a memory, a processor, and a control program stored on the memory and executable on the processor. When the control program is executed by the processor, it implements the steps of the charging control method according to any one of claims 1 to 3.

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