Control method, control device, charging system, and readable storage medium

Abstract

The present application discloses a control method, a control device (10), a charging system (100), and a readable storage medium. The control method comprises: determining a target charging current on the basis of a parameter of a battery; and controlling a charging module to increase the charging current to the target charging current within a predetermined time. By means of the control method, control device (10), charging system (100) and readable storage medium provided in the present application, low charging efficiency or overcharging would not be caused, and various problems caused by instantaneous large-current charging can also be avoided.

Description

Control method, control device, charging system, and readable storage medium

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 202410505161.X, filed with the China National Intellectual Property Administration on April 22, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery management technology, and more specifically, to a control method, control device, charging system, and readable storage medium. Background Technology

[0004] In related technologies, high power or high current is typically used to charge batteries. However, the inventors realized that when a battery is in a high state of charge (SOC), instantaneously initiating high power or high current charging can lead to various problems such as battery overheating, battery polarization, SOC jumps, and battery overcharging, seriously affecting the battery's safety performance and lifespan. Summary of the Invention

[0005] This application provides a control method, a control device, a charging system, and a readable storage medium.

[0006] The control method of this application embodiment is used to control the charging module to charge the battery, the control method including:

[0007] The target charging current is determined based on the parameters of the battery;

[0008] The charging module is controlled to increase the charging current to the target charging current within a predetermined time.

[0009] The control method proposed in this application will not lead to low charging efficiency or overcharging, and can also avoid various problems caused by instantaneous high current charging, thus ensuring the safety performance and service life of the battery.

[0010] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0012] Figure 1 is a flowchart illustrating the control method according to an embodiment of this application;

[0013] Figure 2 is a schematic diagram of the control device according to an embodiment of this application;

[0014] Figure 3 is a schematic diagram of the charging system according to an embodiment of this application;

[0015] Figure 4 is a flowchart illustrating the control method of some embodiments of this application;

[0016] Figure 5 is a flowchart illustrating the control method of some embodiments of this application;

[0017] Figure 6 is a flowchart illustrating the control method of some embodiments of this application;

[0018] Figure 7 is a flowchart illustrating the control method of some embodiments of this application;

[0019] Figure 8 is a comparison curve of the battery voltage difference between the implementation case and the comparative case when charging is started under different SOCs in the embodiments of this application.

[0020] Figure 9 is a comparison curve of voltage and current in the embodiments of this application, from charging from 98% SOC to 100%, between the implementation case and the comparative case.

[0021] Figure 10 is a comparison curve of SOC and current in the embodiments of this application, starting from 95% SOC and charging to 98%, for both the implementation case and the comparative case.

[0022] Figure 11 is a flowchart illustrating the control method of some embodiments of this application;

[0023] Figure 12 is a flowchart illustrating the control method of some embodiments of this application. Detailed Implementation

[0024] The embodiments of this application will be further described below with reference to the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements having the same or similar functions throughout.

[0025] Furthermore, the embodiments of this application described below in conjunction with the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting this application.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] With global warming and the greenhouse effect, market mechanisms are being used to control and reduce greenhouse gas emissions, promoting the vigorous development of green energy. Energy storage applications are becoming increasingly widespread, with a continuously expanding market share, particularly in portable energy storage, power storage, and new energy vehicles. This places increasingly higher demands on batteries, requiring faster charging rates. Especially in emergency situations such as disaster relief backup power and medical emergency backup power, rapid charging of energy storage power sources becomes crucial. Batteries need to be charged to 100% SOC (State of Charge) in short periods (e.g., 60 minutes, 40 minutes, 30 minutes) or 80% SOC in 15 minutes, 20 minutes, 30 minutes, etc., to meet emergency usage needs. Therefore, battery charging rates of 1C, 2C, and higher are required.

[0028] In existing energy storage power technologies, the battery system is basically charged using a method of continuous high current followed by stepped current reduction or high power P (P = U*I, calculated from voltage and current). Intermittent, pulsed, and regular charging followed by fast charging modes have always existed in energy storage power. Regardless of the current power supply capacity or SOC, at the moment of startup, the battery quickly reaches the specified high power or high current for charging without any processing measures. When the SOC is low, such as below 50%, charging with high power or high current does not have a significant impact on the battery because the battery polarization is also minimal. However, at high SOC levels, instantaneously initiating high-power or high-current charging can cause the following problems and drawbacks: 1) It can lead to battery overheating, exacerbating internal electrochemical reactions, causing the battery to become excessively hot, thus shortening its lifespan, damaging it, and potentially causing short circuits, explosions, and other safety issues; 2) It can cause battery polarization, resulting in unstable battery voltage, increased voltage differential within the battery pack, and poor battery consistency, severely impacting battery performance; 3) At SOC levels above 90%, a sudden surge in current can lead to overcharging, affecting battery capacity and safety; 4) Direct high-current charging can cause SOC jumps, resulting in insufficient charging. Therefore, when using batteries, it is essential to avoid the impact of sudden high-current initiation to ensure battery safety and lifespan.

[0029] Please refer to Figure 1. This application proposes a control method for controlling a charging module to charge a battery. The control method includes:

[0030] Step 01: Determine the target charging current based on the battery parameters;

[0031] Step 02: Control the charging module to increase the charging current to the target charging current within a predetermined time.

[0032] Referring to Figure 2, this application also proposes a control device 10 for controlling a charging module to charge a battery. The control device 10 includes a calculation module 11 and a control module 12. The calculation module 11 is used to determine a target charging current based on battery parameters. The control module 12 is used to control the charging module to increase the charging current to the target charging current over a predetermined period of time.

[0033] Referring to Figure 3, another embodiment of the charging system 100 of this application includes a processor 20 and a memory 30. The memory 30 stores a computer program. When the computer program is executed by the processor 20, the processor 20 implements instructions for the control method described above. Alternatively, the processor 20 can determine the target charging current based on the battery parameters, and then control the charging module to increase the charging current to the target charging current over a predetermined period of time.

[0034] The control method, control device 10, and charging system 100 proposed in this application determine the target charging current based on the battery parameters and gradually increase the charging current to the target charging current within a predetermined time. Thus, firstly, the target charging current is determined based on the battery parameters, ensuring that the target charging current matches the current state and preventing low charging efficiency or overcharging. Secondly, the control method controls the charging current to rise to the target charging current within a predetermined time, rather than instantaneously, avoiding various problems caused by instantaneous high-current charging and ensuring the battery's safety performance and lifespan.

[0035] Specifically, battery parameters refer to a series of values ​​or standards that describe the battery's performance, characteristics, and usage conditions. These parameters help us understand the battery's current state and guide us on how to use the battery safely and effectively. In this embodiment, battery parameters include, but are not limited to, battery SOC, battery temperature, and battery voltage.

[0036] The target charging current refers to the maximum current that can charge the battery under the current battery parameters. Parameters such as battery SOC, battery temperature, and battery voltage all affect the target charging current. Theoretically, the target charging current can fully charge the battery the fastest.

[0037] A charging module is a part of the charging management circuit used to control the battery's charging state and protect it. During the charging process, the charging module can manage the battery's charging and discharging by controlling parameters such as current and voltage.

[0038] The scheduled time refers to the time required for the charging current to rise to the target charging current, which is usually related to the battery's state of charge (SOC).

[0039] Please refer to Figure 4. In some embodiments, step 01 includes:

[0040] 011: Obtain the battery's SOC;

[0041] 012: Determine the target charging current based on the SOC. The higher the SOC, the smaller the target charging current.

[0042] This helps to avoid the situation where the SOC jumps due to the use of high current charging when the SOC is large, resulting in insufficient charging power.

[0043] In some embodiments, sub-steps 011 and 012 are implemented by the calculation module 11, or in other words, the calculation module 11 can obtain the SOC of the battery and then determine the target charging current based on the SOC. The higher the SOC, the smaller the target charging current.

[0044] In some embodiments, the processor 20 can be used to acquire the battery's state of charge (SOC) and then determine a target charging current based on the SOC, with a higher SOC resulting in a lower target charging current.

[0045] Specifically, the state of charge (SOC) is the ratio of a battery's remaining capacity after a period of use or long-term storage to its capacity when fully charged, usually expressed as a percentage. Its value ranges from 0 to 1; when SOC = 0, the battery is fully discharged, and when SOC = 1, the battery is fully charged.

[0046] When a battery is close to full charge, i.e., when its state of charge (SOC) is close to 1%, the rate of chemical reactions inside the battery decreases significantly. If it continues to be charged at a high current at this point, it may lead to overcharging inside the battery, which can damage the battery's structure and performance, and may even cause safety issues.

[0047] When the battery's state of charge (SOC) is high, internal polarization intensifies, affecting charging efficiency. Reducing the charging current helps mitigate polarization, improves charging efficiency, and ensures the battery can fully absorb electrical energy.

[0048] Furthermore, when the battery's state of charge (SOC) is high, the battery's heat dissipation capacity may decrease. To avoid safety issues caused by overheating, reducing the charging current helps ensure that the battery's temperature remains within a safe range during charging.

[0049] Please refer to Figure 5. In some embodiments, step 01 includes:

[0050] 013: Obtain the battery voltage;

[0051] 014: Determine the target charging current based on the voltage. The higher the voltage, the smaller the target charging current.

[0052] This helps to avoid the battery overheating due to high current charging under high voltage conditions, which can shorten battery life, damage the battery, and even cause safety problems such as short circuits and explosions.

[0053] In some embodiments, sub-steps 013 and 014 are implemented by the calculation module 11, or in other words, the calculation module 11 can obtain the battery voltage and then determine the target charging current based on the voltage. The higher the voltage, the smaller the target charging current.

[0054] In some embodiments, the processor 20 can be used to acquire the battery voltage and then determine a target charging current based on the voltage, with a higher voltage resulting in a lower target charging current.

[0055] Specifically, battery voltage refers to the potential difference between the positive and negative terminals of the battery, usually expressed in volts (V). Voltage is an important parameter of battery performance, reflecting the amount of electrical energy and driving force the battery can provide.

[0056] First, from the perspective of internal battery chemical reactions, the rate of chemical reactions accelerates when the battery voltage is high. If the charging current is too high at this time, the internal chemical reactions will become too vigorous, potentially generating excessive heat and even triggering the risk of thermal runaway. To avoid this, the charging current needs to be appropriately reduced to control the rate of internal chemical reactions and ensure a safe charging process.

[0057] Secondly, from the perspective of charging efficiency, when the battery voltage is high, the polarization phenomenon inside the battery will be aggravated. Polarization refers to the phenomenon of uneven potential distribution inside the battery due to the non-uniformity of electrochemical reactions during charging or discharging. Polarization reduces the battery's charging efficiency, preventing some electrical energy from being effectively converted into the battery's chemical energy. To mitigate polarization and improve charging efficiency, it is necessary to appropriately reduce the charging current to make the potential distribution inside the battery more uniform.

[0058] Please refer to Figure 1. In some embodiments, step 01 includes:

[0059] 015: Obtain the battery temperature;

[0060] 016: The target charging current is determined based on the temperature. When the temperature is lower than the first preset temperature, the lower the temperature, the smaller the target charging current. When the temperature is higher than the first preset temperature, the higher the temperature, the smaller the target charging current.

[0061] Therefore, the charging power of a battery is usually limited at low temperatures. Choosing a smaller charging current can prevent damage to the battery and protect it from excessive current surges. At high temperatures, the chemical reactions inside the battery become more active, and battery polarization intensifies. Using a smaller charging current can prevent the rapid accumulation of heat inside the battery, which could cause the battery temperature to rise too quickly, thus reducing the risk of thermal runaway.

[0062] In some embodiments, sub-steps 015 and 016 are implemented by the calculation module 11. In other words, the calculation module 11 can obtain the temperature of the battery and then determine the target charging current based on the temperature. When the temperature is lower than the first preset temperature, the lower the temperature, the smaller the target charging current; when the temperature is higher than the first preset temperature, the higher the temperature, the smaller the target charging current.

[0063] In some embodiments, the processor 20 can be used to acquire the temperature of the battery and then determine the target charging current based on the temperature. When the temperature is lower than a first preset temperature, the lower the temperature, the smaller the target charging current; when the temperature is higher than the first preset temperature, the higher the temperature, the smaller the target charging current.

[0064] Specifically, battery temperature is closely related to various factors such as battery type, ambient temperature, charging / discharging state, and usage. When using batteries, adhere to their operating temperature range, avoid overcharging and over-discharging, and perform regular battery maintenance.

[0065] The first preset temperature is the optimal temperature for battery charging, meaning that the battery charges best and has the highest charging rate at this temperature.

[0066] When the battery temperature is below a preset temperature, the viscosity of the electrolyte inside the battery increases, the ion migration rate slows down, and the chemical reactivity of the battery decreases. At this time, if a high current is used for charging, the chemical reaction inside the battery may not be completed in time, leading to heat accumulation and potentially triggering thermal runaway. Furthermore, the charging power of batteries is usually limited at low temperatures to protect them from excessive current surges. Therefore, when the battery temperature is below the preset temperature, a smaller charging current should be selected to avoid damaging the battery.

[0067] When the battery temperature exceeds a preset temperature, the internal chemical reactions become more active, and battery polarization intensifies. At this temperature, using a high charging current will cause rapid heat accumulation within the battery, potentially leading to an excessively rapid temperature rise and the risk of thermal runaway. Furthermore, high temperatures reduce the battery's chemical stability, and high-current charging may accelerate battery aging and degradation, shortening its lifespan. Therefore, even when the battery temperature exceeds the preset temperature, a lower charging current should be selected to ensure charging safety and maintain battery performance.

[0068] Please refer to Figure 7. In some embodiments, step 02 includes:

[0069] 021: Obtain the battery's SOC;

[0070] 022: The reservation time is determined based on the SOC. The higher the SOC, the longer the reservation time.

[0071] Thus, the higher the SOC, the lower the internal reaction rate of the battery, and the more severe the polarization phenomenon. Extending the predetermined time is beneficial to protect the battery, improve charging efficiency, and ensure charging safety.

[0072] In some embodiments, sub-steps 021 and 022 are implemented by the control module 12, or the control module 12 can obtain the battery's SOC and then determine the predetermined time based on the SOC. The higher the SOC, the longer the predetermined time.

[0073] In some embodiments, the processor 20 may be used to obtain the battery's state of charge (SOC) and then determine a predetermined time based on the SOC, with a higher SOC resulting in a longer predetermined time.

[0074] Specifically, when the battery's State of Charge (SOC) is high, internal polarization intensifies, potentially reducing the battery's heat dissipation capacity. If the charging current increases significantly within a given time, the resulting current surge can cause a series of problems, such as SOC jumps, overheating, and overcharging, impacting battery performance. Therefore, the higher the battery's SOC, the longer the pre-charge time should be to slow the rate at which the charging current reaches the target current and reduce the rate of increase in current per unit time, thus preventing large current surges that could cause battery problems.

[0075] In some embodiments, when the SOC is greater than 50%, the predetermined time is 30 to 120 seconds; when the SOC is less than or equal to 50%, the predetermined time is 5 to 30 seconds.

[0076] Therefore, when the SOC is less than or equal to 50% and the preset time is less than 5 seconds, shortening the preset time has little impact on the charging rate, but the charging current increases rapidly, which has a significant impact on the battery. Thus, the preset time should not be shortened further. When the SOC is greater than 50% and the preset time is greater than 120 seconds, increasing the preset time has little impact on the charging current increase rate and has no significant impact on the battery. However, the charging current increase rate is too slow, which has a significant impact on the charging rate. Therefore, the preset time should not be increased further.

[0077] Specifically, in this embodiment, when the SOC is greater than 50%, the predetermined time is typically 30 seconds, to charge the battery as quickly as possible while minimizing impact on battery performance. When the SOC is less than or equal to 50%, the predetermined time is 10 seconds, to ensure the charging speed while minimizing the impact on the battery.

[0078] In some embodiments, step 02 includes:

[0079] 023: Control the charging current to increase linearly to the target charging current at a predetermined slope within a predetermined time.

[0080] This helps to increase the step charging current evenly and stably, and helps to reduce the impact of the increased step charging current on the battery performance and lifespan.

[0081] In some embodiments, sub-step 023 is implemented by the control module 12, or the control module 12 can control the charging current to increase linearly to the target charging current at a predetermined slope within a predetermined time.

[0082] In some embodiments, the processor 20 may be used to control the charging current to increase linearly to a target charging current at a predetermined slope over a predetermined time.

[0083] Specifically, the formula for calculating the charging current is:

[0084] I = at + b;

[0085] Where I is the charging current, a is the predetermined slope, t is the predetermined time, and b is a constant.

[0086] The predetermined slope, predetermined time, and constant are all selected based on factors such as battery SOC, battery temperature, and battery voltage.

[0087] Furthermore, taking lithium iron phosphate batteries as an example, the implementation case uses the control method proposed in this application to charge the battery, while the comparative case directly charges the battery with the target charging current.

[0088] The voltage difference between batteries refers to the voltage difference between a single battery and other batteries in a battery pack. A battery pack typically consists of multiple batteries, and the voltage of each battery should be the same or similar to ensure the normal operation of the battery pack and extend its lifespan. Please refer to Figure 8, which shows a comparison curve of the voltage difference between batteries in an implementation case and a comparative case when charging is initiated at different SOCs. As can be seen from the figure, in the implementation case, although the battery voltage difference increases slightly when charging is initiated at different SOCs, the increase is not significant and it quickly returns to the initial voltage difference. In the comparative case, the battery voltage difference changes significantly when charging is initiated at different SOCs and fails to return to the initial voltage difference for a longer period.

[0089] Please refer to Figure 9, which is a comparison curve of voltage and current between the implementation case and the comparative case when charging from 98% SOC to 100%. It is clear from the figure that when charging the battery using the control method proposed in this application, the battery pack voltage increases slowly. In contrast, in the comparative case, charging the battery with the target charging current causes the battery pack voltage to rise rapidly. This rapid voltage increase can easily lead to problems such as overheating, overcharging, and polarization of the battery.

[0090] Please refer to Figure 10. Figure 10 is a comparison curve of SOC and current in the implementation case and the comparative case when charging from 95% SOC to 98%. It is clear from the figure that when the battery is charged using the control method proposed in this application, the SOC of the battery pack increases normally without any jump. In the comparative case, however, when the battery is charged with the target charging current, the SOC of the battery pack jumps when it increases from 95% to 97%, ultimately leading to insufficient battery charge.

[0091] In some embodiments, step 02 includes:

[0092] 024: Control the charging current to gradually increase to the target charging current within a predetermined time at a predetermined amplitude.

[0093] Therefore, compared to linear growth, stepwise growth with a predetermined amplitude is easier to program, reduces control difficulty, and makes it easier for users to operate.

[0094] In some embodiments, sub-step 024 is implemented by the control module 12, or the control module 12 can control the charging current to increase stepwise to the target charging current within a predetermined time.

[0095] In some embodiments, the processor 20 can be used to control the charging current to increase stepwise to a target charging current at a predetermined magnitude within a predetermined time.

[0096] Specifically, in this embodiment, the predetermined time is divided into t time periods, and the increase in charging current in each time period is:

[0097] Where I0 is the target charging current, and ΔI is the increase in charging current during each time period.

[0098] As is easily understood, the charging current in the first time period is I1 = ΔI, the charging current in the second time period is I2 = 2ΔI, and so on, until the t-th time period, I... t =I0.

[0099] Please refer to Figure 11. In some embodiments, step 01 includes:

[0100] 017: When the battery temperature is less than or equal to zero degrees, reacquire the battery status parameters after letting it stand for a period of time.

[0101] 018: When the battery temperature is above zero degrees, the step current control algorithm formula is obtained using the current battery state parameters.

[0102] This helps avoid the adverse effects of low temperatures on the internal chemical reactions of the battery, ensuring battery safety and performance. Furthermore, low temperatures reduce battery charging efficiency; charging at temperatures above zero degrees Celsius helps improve charging efficiency.

[0103] In some embodiments, sub-steps 017 and 018 are implemented by the calculation module 11. In other words, the calculation module 11 can reacquire the battery state parameters after a period of rest when the battery temperature is less than or equal to zero degrees; and when the battery temperature is higher than zero degrees, it can use the current battery state parameters to obtain the step current control algorithm formula.

[0104] In some embodiments, the processor 20 can be used to reacquire the battery state parameters after a period of rest when the battery temperature is less than or equal to zero degrees; and to obtain the step current control algorithm formula using the current battery state parameters when the battery temperature is higher than zero degrees.

[0105] Specifically, low temperatures negatively impact the chemical reactions inside the battery. At low temperatures, the electrolyte inside the battery becomes viscous, slowing down ion conduction and reducing charging efficiency. Furthermore, charging at low temperatures can cause crystallization inside the battery, further impairing its performance.

[0106] More seriously, charging the battery at low temperatures may cause metallic lithium to deposit on the anode surface. This process is irreversible and will cause permanent damage to the battery. Therefore, it is necessary to control the charging of the battery in an environment above zero degrees Celsius.

[0107] Please refer to Figure 12. In some embodiments, step 02 includes:

[0108] 025: Obtain the current charging current and the target charging current;

[0109] 026: If the current charging current is less than the target charging current, continue charging at the current.

[0110] 027: If the current charging current is equal to the target charging current, then stop charging with the current and switch to charging with the target charging current.

[0111] This allows the battery to be charged with the most suitable current value, avoiding excessive current caused by continuing to use the charging current, which could damage the battery.

[0112] In some embodiments, sub-steps 025, 026, and 027 are implemented by the control module 12, or in other words, the control module 12 can obtain the current step charging current and the target charging current; if the current charging current is less than the target charging current, then continue charging with the step charging current; if the current charging current is equal to the target charging current, then stop charging with the step charging current and switch to charging with the target charging current.

[0113] In some embodiments, the processor 20 can be used to obtain the current step charging current and the target charging current; if the current charging current is less than the target charging current, then continue charging with the step charging current; if the current charging current is equal to the target charging current, then stop charging with the step charging current and switch to charging with the target charging current.

[0114] Specifically, the target charging current refers to the maximum current that can charge the battery under the current battery parameters. Therefore, when the charging current increases to the target charging current, it should continue to be charged at the target charging current. If it continues to increase and the charging current exceeds the target charging current, it is very easy to damage the battery.

[0115] Another embodiment of this application is a non-volatile computer-readable storage medium storing a computer program that, when executed by the processor 20, implements the control method as described above.

[0116] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any other combination. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server 10, or data center to another website, computer, server 10, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server 10 or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0117] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0119] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for controlling a charging module to charge a battery, wherein, The control method includes: The target charging current is determined based on the parameters of the battery; The charging module is controlled to increase the charging current to the target charging current within a predetermined time.

2. The control method according to claim 1, wherein, Determining the target charging current based on the parameters of the battery includes: Obtain the SOC of the battery; The target charging current is determined based on the State of Charge (SOC). The higher the SOC, the lower the target charging current.

3. The control method according to claim 1, wherein, Determining the target charging current based on the parameters of the battery includes: Obtain the voltage of the battery; The target charging current is determined based on the voltage; the higher the voltage, the lower the target charging current.

4. The control method according to claim 1, wherein, Determining the target charging current based on the parameters of the battery includes: Obtain the temperature of the battery; The target charging current is determined based on the temperature.

5. The control method according to claim 4, wherein, Determining the target charging current based on the temperature includes: When the temperature is lower than the first preset temperature, the lower the temperature, the smaller the target charging current; when the temperature is higher than the first preset temperature, the higher the temperature, the smaller the target charging current.

6. The control method according to claim 1, wherein, The step of controlling the charging module to increase the charging current to the target charging current over a predetermined time includes: Obtain the SOC of the battery; The predetermined time is determined based on the State of Charge (SOC), and the higher the SOC, the longer the predetermined time.

7. The control method according to claim 6, wherein, When the SOC is greater than 50%, the predetermined time is 30 to 120 seconds; when the SOC is less than or equal to 50%, the predetermined time is 5 to 30 seconds.

8. The control method according to claim 7, wherein, When the SOC is greater than 50%, the predetermined time is 30 seconds; when the SOC is less than or equal to 50%, the predetermined time is 10 seconds.

9. The control method according to claim 1, wherein, The step of controlling the charging module to increase the charging current to the target charging current over a predetermined time includes: The charging current is controlled to increase linearly to the target charging current at a predetermined slope within the predetermined time.

10. The control method according to claim 9, wherein, The formula for calculating the charging current is: I = at + b; In the formula, I is the charging current, a is the predetermined slope, t is the predetermined time, and b is a constant.

11. The control method according to claim 10, wherein, Controlling the charging current to linearly increase to the target charging current at a predetermined slope within a predetermined time includes: Obtain the SOC, battery temperature, and battery voltage of the battery; The predetermined slope, the predetermined time, and the constant are determined based on the SOC, the battery temperature, and the battery voltage.

12. The control method according to claim 1, wherein, The step of controlling the charging module to increase the charging current to the target charging current over a predetermined time includes: The charging current is controlled to increase stepwise to the target charging current within a predetermined time period at a predetermined magnitude.

13. The control method according to claim 12, wherein, The predetermined time is divided into t time periods, and the increase in charging current in each time period is: In the formula, I0 represents the target charging current, and ΔI represents the increase in the charging current during each time period.

14. The control method according to claim 1, wherein, Determining the target charging current based on the parameters of the battery includes: When the battery temperature is less than or equal to the second preset temperature, the battery status parameters are reacquired after a period of time. When the battery temperature is higher than the second preset temperature, the step current control algorithm formula is obtained using the current battery state parameters.

15. The control method according to claim 14, wherein, The second preset temperature is zero degrees.

16. The control method according to claim 1, wherein, The step of controlling the charging module to increase the charging current to the target charging current over a predetermined time includes: Obtain the current charging current and the target charging current; If the current charging current is less than the target charging current, continue charging at the current. If the current charging current equals the target charging current, then stop charging with the current and switch to charging with the target charging current.

17. A control device for controlling a charging module to charge a battery, wherein, The control device includes: A calculation module is used to determine the target charging current based on the parameters of the battery; A control module is used to control the charging module to increase the charging current to the target charging current within a predetermined time.

18. A charging system, wherein, It includes a processor and a memory, the memory storing a computer program that, when executed by the processor, causes the processor to implement the instructions of the control method as described in any one of claims 1-16.

19. A non-volatile computer-readable storage medium, wherein, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the control method as described in any one of claims 1-16.

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