Battery charging control method and apparatus, computing device, and medium

Abstract

A battery charging control method and device, a computing device and a storage medium are disclosed. The method comprises: determining a material activity interval of a battery based on an electrical parameter (102); and charging the battery based on a charging strategy corresponding to the material activity interval (103). For a battery of a composite material system, the material with high reactivity is different in different states during charging. Therefore, by detecting the material activity interval of the battery in real time, the charging strategy suitable for the activity interval is adopted for charging in different material activity intervals, so as to ensure that the battery is charged with sufficient power and the charging speed of the battery is accelerated.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a battery charging control method, device, computing device and medium. Background Art

[0002] Lithium-ion batteries are secondary batteries. Compared with other types of batteries, lithium-ion batteries have many advantages, so their applications are becoming more and more widespread. For example, in the field of new energy computing devices, lithium-ion batteries are usually selected as their power source. The charging process of lithium-ion batteries is mainly the extraction of lithium ions from the positive electrode and the insertion into the negative electrode. This process rate is affected by the rates of many electrochemical processes. Taking the commonly used graphite negative electrode system as an example, when the charging current is too large, the negative electrode polarization is large, and lithium deposition occurs on the surface of the negative electrode at this time. This not only affects the charging efficiency of the battery but also has great safety risks.

[0003] Currently, batteries are usually produced using composite material systems formed by different materials. For example, LiFePO4 (lithium iron phosphate) and LiMnPO4 (lithium manganese phosphate) are formed into a LiFe 1-x Mn x PO4 (lithium manganese iron phosphate, 0 < x < 1) composite material system.

[0004] However, existing charging control schemes all use the full charge cut-off voltage as the end charging condition. For the composite material system of lithium manganese iron phosphate, when the battery is in the high SOC range, due to the large polarization of the battery positive electrode, the battery voltage will quickly reach the full charge cut-off voltage, resulting in the problem that the battery cannot be fully charged. Summary of the Invention

[0005] In view of the above problems, this application proposes a battery charging control method, device, computing device and storage medium, so that while the battery charging speed is fast, enough charge can be charged.

[0006] A first aspect of this application proposes a battery charging control method, and the method includes: obtaining electrical parameters during the battery charging process; determining the material activity interval where the battery is located based on the electrical parameters, and the material activity interval reflects the chemical reaction activity of the battery under the corresponding electrical parameters; charging the battery based on the charging strategy corresponding to the material activity interval.

[0007] In the technical solution of the embodiments of this application, for a battery with a composite material system, during the charging process, different materials with high chemical reaction activity are different under different electrical parameter states of the battery. Therefore, the material activity interval where the battery is located is detected in real time through the electrical parameters of the battery, and a charging strategy adapted to this activity interval is used for charging for different material activity intervals, so as to accelerate the charging speed of the battery while allowing the battery to charge enough electricity.

[0008] In some embodiments, for batteries with composite material systems, the materials with high chemical reactivity differ under different electrical parameter states, therefore the material activity range must include at least a first material activity range and a second material activity range.

[0009] In some embodiments, when the battery is a lithium manganese iron phosphate composite material system, the reactivity of lithium iron phosphate material in the lithium manganese iron phosphate composite material is mainly in the low voltage region, while the reactivity of lithium manganese phosphate material is mainly in the high voltage region. Therefore, the first material activity range is the lithium iron phosphate material range; the second material activity range is the lithium manganese phosphate material range.

[0010] In some embodiments, charging the battery based on a charging strategy corresponding to the material's active region includes: determining that the material's active region is the lithium manganese phosphate material region; using the maximum output current of the charging device as the charging current to charge until the battery voltage meets the full charge cutoff condition; and performing multiple constant-voltage charging according to a preset full charge cutoff voltage. When the battery enters the lithium manganese phosphate material region, it indicates that the battery's charge level has entered the high-end SOC range. The battery's polarization resistance mainly comes from the positive electrode material. Under high current conditions, the negative electrode has not yet reached the lithium plating potential, while the battery quickly reaches the full charge cutoff voltage due to the large polarization of the positive electrode. Therefore, in the lithium manganese phosphate material region, the battery's charging current can be unrestricted. Thus, in this embodiment, the maximum output current of the charging device is used as the charging current to charge until the battery voltage meets the full charge cutoff condition to maximize the charging speed. Then, multiple constant-voltage charging is performed according to the full charge cutoff voltage to ensure that the battery is charged with sufficient power.

[0011] In some embodiments, the battery voltage meeting the full charge cutoff condition includes: starting a timer when the battery voltage reaches a preset full charge cutoff voltage; and determining that the battery voltage meets the full charge cutoff condition when the timer reaches a preset duration and the battery voltage still reaches the full charge cutoff voltage. By using the condition that the battery voltage reaches the full charge cutoff voltage and remains there for a certain period of time as the end condition for charging with the maximum output current, the authenticity of the battery voltage reaching the full charge cutoff voltage can be ensured.

[0012] In some embodiments, performing multiple constant-voltage charging based on a preset full-charge cutoff voltage includes: determining the battery voltage fluctuation range based on the full-charge cutoff voltage; using the maximum output current of the charging device as the initial charging current for constant-voltage charging; and gradually reducing the charging current according to the first battery state to maintain the battery voltage within the fluctuation range, thereby completing one constant-voltage charging cycle. Each constant-voltage charging (CV) cycle continuously decreases the large charging current through adaptive adjustment to maintain the battery voltage fluctuating near the full-charge cutoff voltage, thereby charging a certain amount of energy. Through multiple constant-voltage charging adjustments, the battery is charged to a sufficient level, avoiding the problem of incomplete charging that occurs with existing charging control schemes.

[0013] In some embodiments, charging the battery based on a charging strategy corresponding to the material's active range includes: determining that the material's active range is a lithium iron phosphate material range, and adjusting the charging current according to the second battery state. When the battery state is in the lithium iron phosphate material range, it indicates that the battery's charge level is in the low-end SOC range, and electrode polarization mainly originates from the negative electrode material. Excessive charging current can easily lead to lithium plating at the negative electrode. Therefore, in this embodiment, the charging current is adaptively adjusted according to the battery's state parameters to alleviate the problem of lithium plating at the negative electrode.

[0014] In some embodiments, adjusting the charging current based on the second battery state includes: acquiring the second battery state every preset period, and obtaining a target charging request current by looking up a preset charging window table based on the second battery state; and charging with the target charging request current as the charging current. The charging window table is calculated based on the battery's lithium plating window. Adjusting the charging current by looking up the charging window table periodically allows the battery to be charged quickly using its maximum current capability while reducing lithium plating issues.

[0015] In some embodiments, the second battery state includes the highest temperature, lowest temperature, maximum SOC, and minimum SOC of the battery cells. Obtaining the target charging request current by looking up a preset charging window table based on the second battery state includes: determining different combinations of temperature and SOC based on the highest temperature, lowest temperature, maximum SOC, and minimum SOC; searching the charging window table for the charging request current corresponding to each combination; and obtaining the target charging request current based on the charging request current corresponding to each combination. Since the battery's charging capacity changes with its temperature and SOC value, the final target charging request current is determined by searching for the charging request current corresponding to different combinations of temperature and SOC of the battery cells, and by comprehensively considering the charging request current of each combination.

[0016] In some embodiments, obtaining the target charging request current based on the charging request current corresponding to each combination includes: determining the smallest charging request current among the charging request currents as the target charging request current. Since different battery cells have different charging capabilities, charging is performed using the smallest charging request current in each combination to maximize the safety of battery cell charging.

[0017] In some embodiments, before determining the material activity range of the battery based on the electrical parameters, the method further includes: determining the maximum acceptable charging current of the battery; and charging with the maximum charging current. At the beginning of charging, due to the influence of battery temperature, voltage, and state of charge (SOC), it is necessary to obtain the battery's maximum required current for charging to improve battery charging safety.

[0018] In some embodiments, determining the material activity range of the battery based on the electrical parameters includes: determining the material activity range of the battery based on a preset parameter threshold of the electrical parameters. During charging, the electrical parameters tend to increase, while the chemical reactivity of the material is affected by the electrical parameters. Therefore, distinguishing the material activity range of the battery by comparing the electrical parameters with a preset parameter threshold is more accurate.

[0019] In some embodiments, the electrical parameters may include battery voltage or state of charge (SOC).

[0020] In some embodiments, determining the material activity range of the battery based on the electrical parameters includes: determining the material activity range of the battery as a first material activity range based on the electrical parameters being less than a preset parameter threshold; and determining the material activity range of the battery as a second material activity range based on the electrical parameters being greater than or equal to the preset parameter threshold. During charging, the electrical parameters show an increasing trend, and comparing the electrical parameters with the preset parameter threshold can effectively distinguish the material activity ranges.

[0021] In some embodiments, obtaining the electrical parameters during the battery charging process includes: obtaining the individual cell voltage of each cell in the battery; and selecting the largest individual cell voltage from the individual cell voltages of each cell as the battery voltage. Since a battery is usually composed of multiple individual cells, and each cell undergoes a charging and discharging process and has a charging and discharging voltage, it is more accurate to use the largest individual cell voltage among these cells as the overall battery voltage.

[0022] A second aspect of this application discloses a battery charging control device, the device comprising:

[0023] The parameter acquisition module is used to acquire the electrical parameters of the battery during the charging process;

[0024] The interval detection module is used to determine the material activity interval of the battery based on the electrical parameters, wherein the material activity interval reflects the chemical reaction activity of the battery under the corresponding electrical parameters;

[0025] A charging control module is used to charge the battery based on a charging strategy corresponding to the active range of the material.

[0026] A third aspect of this application provides a computing device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, performs the steps of the method described in the first aspect above.

[0027] The fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect above.

[0028] The fifth aspect of this application provides an electrical device including a computing device as described in the third aspect above.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 This is a flowchart illustrating an embodiment of a battery charging control method according to an exemplary embodiment of this application;

[0032] Figure 2 This application illustrates a specific implementation flowchart of battery charging control according to an exemplary embodiment.

[0033] Figure 3 This is a schematic diagram of the structure of a battery charging control device according to an exemplary embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the hardware structure of a computing device according to an exemplary embodiment of this application;

[0035] Figure 5This is a schematic diagram illustrating the structure of a storage medium according to an exemplary embodiment of this application. Detailed Implementation

[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0042] Currently, the main reasons affecting the charging speed of electric devices include the charging capacity limitation of the battery system and the regulation ability of the charging control scheme. Currently, electric devices usually choose lithium-ion batteries as the power source. For lithium-ion batteries, in addition to lithium plating on the negative electrode causing battery safety accidents, overcharging voltage can also lead to charging safety problems. The charging cut-off voltage of lithium-ion batteries is usually determined by combining the characteristics of battery materials and the electrochemical safety charging window of electrolyte materials. Therefore, during the charging process of electric devices, the battery management system (BMS) will continuously detect the battery voltage in the PACK system (battery pack). When the battery voltage is greater than the full charge cut-off voltage and lasts for a period of time, the battery management system will set the full charge flag bit to end the charging.

[0043] During the use of batteries with different material systems, the influencing factors to be considered are inconsistent. Lithium iron phosphate (LiFePO4) materials have good cycle performance and safety performance, but their charge and discharge voltage platforms are relatively low, resulting in low battery energy density and affecting the driving range of electric devices. Among homologous compounds, lithium manganese phosphate (LiMnPO4) has a high discharge voltage platform, but its reaction activity is low. Therefore, in industrial production, LiFePO4 and LiMnPO4 are usually compounded to form lithium manganese iron phosphate materials (LiFe 1-x Mn x PO 4， 0<x<1). During the charge and discharge process of lithium manganese iron phosphate materials, there are two regions: between 4.0 - 4.1V, corresponding to the high reaction activity of manganese ions (Mn 3+ / Mn 2+ ); between 3.5 - 3.6V, corresponding to the high reaction activity of iron ions (Fe 3+ / Fe 2+ ).

[0044] Research has found that during the charging process, when the battery voltage enters the range of 4.0 - 4.1V (i.e., the battery is in the high SOC range), the kinetic performance of the battery negative electrode is better than that of the positive electrode, and the polarization impedance of the battery mainly comes from the positive electrode material. Under high-current charging conditions, the lithium plating potential of the battery negative electrode has not been reached, but due to excessive polarization of the battery positive electrode, the full charge cut-off voltage of the battery is quickly reached. If the battery management system sets the full charge flag bit to end the charging, it will result in insufficient charge in the battery, affecting the driving range of electric devices.

[0045] Therefore, for batteries using lithium manganese iron phosphate materials, during the charging process, how to make the charging current large enough, the charging speed fast enough, and at the same time be able to charge enough electricity is the main problem to be considered.

[0046] In order to enable the battery to charge quickly and with sufficient charge, this application has found that for composite material batteries, the materials with high reactivity differ under different electrical parameter states during charging. Therefore, by obtaining the electrical parameters during the battery charging process and determining the material activity range of the battery based on these parameters, and then using a charging strategy corresponding to the material activity range, the battery can be charged with sufficient charge while accelerating the charging speed.

[0047] The battery charging control method disclosed in this application is applicable to any device that uses lithium-ion batteries as a power source, such as new energy electric vehicles, electric motorcycles, and electric boats.

[0048] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0049] Figure 1 This is a flowchart illustrating an embodiment of a battery charging control method according to an exemplary embodiment of this application. In this embodiment, the battery refers to a battery pack or battery module composed of multiple individual battery cells. The battery charging control method includes the following steps:

[0050] Step 101: Obtain electrical parameters during the battery charging process.

[0051] The electrical parameters of a battery may include battery voltage, state of charge (SOC), etc.

[0052] Regarding the process of obtaining battery voltage, in one optional specific embodiment, when the electrical parameter is battery voltage, since a battery is usually composed of multiple cells, the highest single-cell voltage from each cell can be selected as the battery voltage. Since each cell undergoes a charging and discharging process and has its own charging and discharging voltage, using the highest single-cell voltage from these cells as the overall battery voltage is more accurate.

[0053] It is understandable that when the electrical parameter is SOC, the principle for obtaining the electrical parameter is similar to the principle described above.

[0054] Step 102: Determine the material activity range of the battery based on the electrical parameters.

[0055] Among them, the material activity range reflects the chemical reactivity of the battery under the corresponding electrical parameters, that is, it is used to indicate which material has high chemical reactivity in the current battery state.

[0056] In the embodiments of this application, for batteries with composite material systems, the battery is in different states of charge during the charging process, and the ionic materials with high reactivity are different. Therefore, it is necessary to detect the material activity range of the battery in real time so as to adopt a charging strategy suitable for the current range.

[0057] Specifically, when the battery is a composite material system, it is composed of at least two materials, and therefore the material activity range includes at least a first material activity range and a second material activity range.

[0058] In one possible implementation, the battery's electrical parameters generally increase during charging, while the chemical reactivity of the materials is affected by the battery's electrical parameters. Therefore, it would be more appropriate to distinguish the material activity range of the battery by comparing the electrical parameters with preset parameter thresholds.

[0059] Specifically, regarding the process of determining the material activity range of a battery based on electrical parameters, the material activity range can be effectively distinguished by comparing the electrical parameters with preset parameter thresholds. That is, when the electrical parameters are less than the preset parameter threshold, the material activity range of the battery is determined to be the first material activity range; when the electrical parameters are greater than or equal to the preset parameter threshold, the material activity range of the battery is determined to be the second material activity range.

[0060] Furthermore, when the battery is a lithium manganese iron phosphate composite material system, the reactivity of lithium iron phosphate material in the lithium manganese iron phosphate composite material is mainly in the low voltage region, while the reactivity of lithium manganese phosphate material is mainly in the high voltage region. Therefore, the first material activity range is the lithium iron phosphate material range, and the second material activity range is the lithium manganese phosphate material range.

[0061] In one example, assuming a voltage between 4.0 and 4.1 V, the corresponding manganese ion (Mn) 3+ / Mn 2+ The reactivity of this substance is high, between 3.5 and 3.6 V, corresponding to iron ions (Fe). 3+ / Fe 2+ Because of its high reactivity, the voltage threshold can be set to 4V. That is, when the battery voltage is less than 4V, the battery operates within the lithium iron phosphate material range; when the battery voltage reaches 4V or higher, the battery operates within the lithium manganese phosphate material range.

[0062] It is worth noting that battery voltage is strongly correlated with battery SOC. The higher the battery voltage, the higher the battery SOC. Therefore, when the battery is in the active range of lithium iron phosphate material, its corresponding SOC is in the low-end SOC range, and when the battery is in the active range of lithium manganese phosphate material, its corresponding SOC is in the high-end SOC range.

[0063] Before performing step 102, it is necessary to exchange information with the charging device to complete the charging current request in the initial stage of charging and obtain the maximum output current of the charging device.

[0064] In the initial stage of charging, the battery temperature, voltage, and state of charge (SOC) are all factors that affect its performance. To improve battery charging safety, the maximum acceptable charging current for the battery can be determined and used as the charging current.

[0065] Understandably, relevant calculation logic can be used to calculate the current acceptable charging capacity (i.e., maximum charging current) of the battery based on battery temperature, battery voltage, and SOC value.

[0066] Step 103: Charge the battery using a charging strategy corresponding to the active region of the material.

[0067] In the embodiments of this application, a suitable charging strategy can be designed in advance for each material active region based on the characteristics of different material active regions, so as to maximize the battery charging speed while reducing the occurrence of lithium plating problems and charging a sufficient amount of electricity.

[0068] In some embodiments, the first material active region and the second material active region correspond to different charging strategies.

[0069] The following uses a composite lithium manganese iron phosphate material system as an example to give charging strategies for the first material's active range being the active range of lithium iron phosphate and the second material's active range being the active range of manganese iron phosphate:

[0070] For materials with an activity range of lithium iron phosphate, the charging current can be adjusted according to the state of the second battery.

[0071] When the battery state is in the lithium iron phosphate material range, it indicates that the battery charge is in the low-end SOC range, and the electrode polarization mainly comes from the negative electrode material. Excessive charging current can easily lead to lithium plating on the negative electrode. Therefore, in this embodiment, the charging current is adaptively adjusted according to the second battery state to alleviate the problem of lithium plating on the negative electrode.

[0072] In one optional specific implementation, the second battery state can be obtained once every preset period, and the target charging request current can be obtained by looking up a preset charging window table based on the second battery state, and the target charging request current can be used as the charging current.

[0073] The charging window table is calculated based on the lithium plating window of the battery. By checking the charging window table and adjusting the charging current at regular intervals, the battery can always use its maximum current capacity for fast charging while reducing the occurrence of lithium plating problems.

[0074] The preset cycle represents the adjustment cycle of the charging current. It can be set based on actual experience. The larger the cycle, the longer the adjustment interval, and the smaller the cycle, the shorter the adjustment interval.

[0075] Furthermore, the charging window of a lithium-ion battery varies with battery temperature and state of charge (SOC), and different combinations of battery temperature and SOC correspond to different charging request currents within the charging window.

[0076] Optionally, the second battery state may include the highest temperature, lowest temperature, maximum SOC, and minimum SOC of the battery cells.

[0077] Based on this, for the process of obtaining the target charging request current by looking up a preset charging window table according to the state of the second battery, different combinations of temperature and SOC can be determined according to the highest temperature, lowest temperature, maximum SOC, and minimum SOC. Then, the charging request current corresponding to each combination can be found in the charging window table, and the target charging request current can be obtained according to the charging request current corresponding to each combination.

[0078] Due to the differences among the individual cells in the battery, there will be a maximum temperature, a minimum temperature, a maximum SOC, and a minimum SOC among all the cell temperatures and SOCs. By combining different temperatures and SOCs and comprehensively considering the charging request current for each combination, the final target charging request current is determined, making the final determined charging current more suitable for the current state of the battery.

[0079] Because battery temperature and SOC value change continuously, the charging window table cannot list all combinations of battery temperature and SOC value. Therefore, a linear lookup table method and / or a step-by-step lookup table method can be used when looking up the charging window table.

[0080] Furthermore, based on the highest temperature, lowest temperature, maximum SOC, and minimum SOC, we can determine four different combinations of temperature and SOC: highest temperature and maximum SOC, highest temperature and minimum SOC, lowest temperature and maximum SOC, and lowest temperature and minimum SOC.

[0081] For each combination of charging request current, the process of obtaining the target charging request current is as follows: Since different cells have different charging capabilities, the minimum charging request current can be determined as the target charging request current in order to improve the safety of battery cell charging as much as possible.

[0082] Then, for materials with an activity range of lithium manganese phosphate, the maximum output current of the charging device can be used as the charging current to charge until the battery voltage meets the full charge cutoff condition, and multiple constant voltage charging is performed according to the preset full charge cutoff voltage.

[0083] The "full charge cutoff condition" indicates the condition for stopping charging at the maximum output current of the charging equipment, not the end of the battery charging process. When the battery enters the lithium manganese phosphate (LMP) material range, it means the battery charge has entered the high-end SOC range. The battery's polarization resistance mainly comes from the positive electrode material. Under high current conditions, the negative electrode has not yet reached the lithium plating potential, while the battery quickly reaches the full charge cutoff voltage due to the high polarization of the positive electrode. Therefore, in the LMP material range, the battery charging current can be unrestricted. Thus, constant current charging using the maximum output current of the charging equipment is first performed until the battery voltage meets the full charge cutoff condition to maximize the charging speed. Then, multiple constant voltage charging operations are performed based on the full charge cutoff voltage to ensure the battery is charged with sufficient capacity.

[0084] In one specific embodiment, the process of determining whether the battery voltage meets the full charge cutoff condition can be as follows: timing can begin when the battery voltage reaches a preset full charge cutoff voltage. If the battery voltage still reaches the full charge cutoff voltage after the preset time has elapsed, then the battery voltage meets the full charge cutoff condition.

[0085] In this embodiment, by using the condition that the battery voltage reaches the full charge cutoff voltage and remains there for a certain period of time as the end condition for charging with the maximum output current, the authenticity of the battery voltage reaching the full charge cutoff voltage can be improved.

[0086] In another specific embodiment, for the process of performing multiple constant-voltage charging based on a preset full-charge cutoff voltage, the fluctuation range of the battery voltage can be determined first based on the full-charge cutoff voltage. Then, the maximum output current of the charging device is used as the initial charging current for constant-voltage charging. The charging current is gradually reduced according to the first battery state to maintain the battery voltage within the fluctuation range. When the charging current is determined to drop to a preset current threshold, the cycle count is incremented by 1. Further, if the cycle count has not reached the preset number, the process continues to return to the step of using the maximum output current of the charging device as the initial charging current for constant-voltage charging to perform the next constant-voltage charging process.

[0087] Specifically, after charging the battery voltage to the full charge cutoff voltage using the maximum output current of the charging device, in order to maintain the battery voltage near the full charge cutoff voltage during constant voltage charging, the full charge cutoff voltage ± deviation threshold can be used as the fluctuation range of the battery voltage.

[0088] Constant voltage charging refers to a charging process in which the battery voltage remains constant. The number of constant voltage charging cycles can be determined through experimental testing, and this number needs to ensure the battery can ultimately hold a sufficient amount of charge. Optionally, the first battery state used to adjust the charging current during each constant voltage charging process may include the maximum acceptable current of the cell, the real-time collected individual cell voltage, and the real-time collected charging current.

[0089] In this embodiment, each constant voltage charge (CV) continuously decreases the large charging current by adaptive adjustment to maintain the battery voltage fluctuating near the full charge cutoff voltage, so as to charge a certain amount of power. After multiple constant voltage charge adjustments, the battery is charged with enough power, so as not to cause the problem of the battery not being fully charged when using the existing charging control scheme.

[0090] It should be noted that the proposed solution is not limited to the lithium manganese iron phosphate composite material battery described above, but is also applicable to other composite material batteries. For other composite material batteries, different material activity ranges can be divided according to the battery voltage, and different charging strategies can be adopted.

[0091] This completes the above. Figure 1 The battery charging control process shown is as follows: For composite material batteries, different materials with high chemical reactivity exist under different electrical parameter states during the charging process. Therefore, the active range of the material in which the battery is located is detected in real time by the battery's electrical parameters. For different active ranges, a charging strategy adapted to that active range is adopted to charge the battery, so that the battery can be charged with enough power while speeding up the charging speed.

[0092] Regarding the technical solutions provided in the above embodiments, the following is a comprehensive description of the present application solution using a specific embodiment.

[0093] Figure 2 This application illustrates a specific implementation flowchart of battery charging control according to an exemplary embodiment. The following detailed description uses a new energy electric vehicle battery charging control as an example, and the battery employs a lithium manganese iron phosphate material system, including the following steps:

[0094] Step 1: Wake up the vehicle and plug in the charging gun. The vehicle will then communicate with the charging station and charge using the battery's current maximum acceptable charging current.

[0095] The battery management system calculates the current acceptable charging capacity of the battery (i.e., the maximum charging current that the battery can currently accept) based on its internal calculation logic and sends it to the vehicle and the charging pile (i.e., the charging equipment). The charging pile responds in a timely manner and outputs the corresponding requested charging current, while sending its own maximum output current value to the vehicle's VCU.

[0096] Step 2: During the charging process, the voltage of each cell in the battery is detected in real time, and the highest single cell voltage is selected as the battery voltage.

[0097] Step 3: Based on the fact that the battery voltage is less than the preset voltage threshold, determine that the material activity range of the battery is in the lithium iron phosphate material range, and then proceed to step 5.

[0098] Step 4: Based on the battery voltage being greater than or equal to a preset voltage threshold, determine that the material activity range of the battery is the lithium manganese phosphate material range, and then proceed to step 6.

[0099] Step 5: At preset intervals, obtain the status of the second battery once, and look up the charging window table based on the status of the second battery to obtain the target charging request current for charging.

[0100] Step 6: Use the maximum output current of the charging pile as the charging current to charge until the battery voltage meets the full charge cutoff condition. After performing multiple constant voltage charging based on the full charge cutoff voltage, the charging process ends.

[0101] For the specific implementation of steps 1-6 above, please refer to the above. Figure 1 The relevant descriptions in the illustrated embodiments will not be repeated here.

[0102] This completes the above. Figure 2 The specific process of battery charging control is shown below.

[0103] Corresponding to the embodiments of the aforementioned battery charging control method, this application also provides embodiments of a battery charging control device.

[0104] Figure 3 This is a schematic diagram illustrating the structure of a battery charging control device according to an exemplary embodiment of this application. The device is used to execute the battery charging control method provided in any of the above embodiments, such as... Figure 3 As shown, the battery charging control device includes:

[0105] The parameter acquisition module 310 is used to acquire electrical parameters during the battery charging process;

[0106] The interval detection module 320 is used to determine the material activity interval of the battery based on the electrical parameters, wherein the material activity interval reflects the chemical reaction activity of the battery under the corresponding electrical parameters;

[0107] The charging control module 330 is used to charge the battery based on a charging strategy corresponding to the active range of the material.

[0108] The specific implementation process of the functions and roles of each unit in the above device can be found in the implementation process of the corresponding steps in the above method, and will not be repeated here.

[0109] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this application according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0110] This application also provides a computing device corresponding to the battery charging control method provided in the foregoing embodiments, for executing the battery charging control method described above.

[0111] Figure 4 This application illustrates a hardware structure diagram of a computing device according to an exemplary embodiment. The computing device can be a BMS, vehicle controller, motor controller, domain controller, etc., and includes: a communication interface 601, a processor 602, a memory 603, and a bus 604. The communication interface 601, processor 602, and memory 603 communicate with each other via the bus 604. The processor 602 can execute the battery charging control method described above by reading and executing machine-executable instructions corresponding to the control logic of the battery charging control method in the memory 603. The specific content of this method is described in the above embodiment and will not be repeated here.

[0112] The memory 603 mentioned in this application can be any electronic, magnetic, optical, or other physical storage device, and can contain stored information such as executable instructions, data, etc. Specifically, the memory 603 can be RAM (Random Access Memory), flash memory, storage drive (such as hard disk drive), any type of storage disk (such as optical disc, DVD, etc.), or similar storage media, or combinations thereof. Communication between this system network element and at least one other network element is achieved through at least one communication interface 601 (which can be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc., can be used.

[0113] Bus 604 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory 603 is used to store programs, and the processor 602 executes the programs after receiving execution instructions.

[0114] Processor 602 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 602 or by instructions in software form. The processor 602 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), an On-Premises Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor.

[0115] The computing device provided in this application embodiment and the battery charging control method provided in this application embodiment are based on the same inventive concept and have the same beneficial effects as the methods they adopt, operate or implement.

[0116] This application also provides an electrical device that includes the computing device described above. Further, the electrical device using the computing device can specifically be an electric vehicle, an electric boat, etc.

[0117] This application also provides a computer-readable storage medium corresponding to the battery charging control method provided in the foregoing embodiments. Please refer to... Figure 5 As shown, the computer-readable storage medium is an optical disc 30, on which a computer program (i.e., a program product) is stored. When the computer program is run by a processor, it executes the battery charging control method provided in any of the foregoing embodiments.

[0118] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media, which will not be elaborated here.

[0119] The computer-readable storage medium provided in the above embodiments of this application and the battery charging control method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the applications stored therein.

[0120] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0121] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0122] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery charging control method, characterized in that, The method includes: Obtain the electrical parameters during the battery charging process; The material activity range of the battery is determined based on the electrical parameters, and the material activity range reflects the chemical reactivity of the battery under the corresponding electrical parameters. The battery is charged based on a charging strategy corresponding to the active region of the material; The charging of the battery based on a charging strategy corresponding to the active region of the material includes: The active range of the material is determined to be the lithium manganese phosphate material range. The maximum output current of the charging device is used as the charging current to charge the battery until the battery voltage meets the full charge cutoff condition. Multiple constant voltage charging is performed according to the preset full charge cutoff voltage. The step of performing multiple constant-voltage charging according to a preset full-charge cutoff voltage includes: The fluctuation range of the battery voltage is determined based on the full charge cutoff voltage. The maximum output current of the charging device is used as the initial charging current for constant voltage charging, and the charging current is gradually reduced according to the first battery state to maintain the battery voltage within the floating range.

2. The method according to claim 1, characterized in that, The battery is a composite material system, and the active material region includes at least a first active material region and a second active material region.

3. The method according to claim 2, characterized in that, The battery is charged based on a charging strategy corresponding to the active region of the material, including: The first material active region and the second material active region correspond to different charging strategies.

4. The method according to claim 2 or 3, characterized in that, When the battery is a lithium manganese iron phosphate composite material system, the first material activity range is the lithium iron phosphate material range; The second material's active range is the lithium manganese phosphate material range.

5. The method according to claim 1, characterized in that, The battery voltage meets the full charge cutoff conditions, including: The timing begins when the battery voltage reaches the preset full charge cutoff voltage; When the timer reaches the preset duration, if the battery voltage still reaches the full charge cutoff voltage, it is determined that the battery voltage meets the full charge cutoff condition.

6. The method according to claim 4, characterized in that, The charging of the battery based on a charging strategy corresponding to the active region of the material includes: The active range of the material is determined to be the lithium iron phosphate material range, and the charging current is adjusted according to the state of the second battery.

7. The method according to claim 6, characterized in that, The step of adjusting the charging current according to the state of the second battery includes: Every preset period, the second battery status is acquired once, and the target charging request current is obtained by looking up a preset charging window table based on the second battery status. The target charging request current is used as the charging current for charging.

8. The method according to claim 7, characterized in that, The second battery state includes the highest temperature, lowest temperature, maximum SOC, and minimum SOC of the battery cells; The step of obtaining the target charging request current by looking up a preset charging window table based on the second battery state includes: Different combinations of temperature and SOC are determined based on the highest temperature, lowest temperature, maximum SOC, and minimum SOC. Find the charging request current corresponding to each combination method in the charging window table; The target charging request current is obtained based on the charging request current corresponding to each combination method.

9. The method according to claim 8, characterized in that, The step of obtaining the target charging request current based on the charging request current corresponding to each combination method includes: The smallest of the charging request currents is determined as the target charging request current.

10. The method according to claim 1, characterized in that, Before determining the material activity range of the battery based on the electrical parameters, the method further includes: Determine the maximum charging current that the battery can currently accept; The maximum charging current is used as the charging current for charging.

11. The method according to claim 1, characterized in that, Determining the material activity range of the battery based on the electrical parameters includes: The material activity range of the battery is determined based on the preset parameter threshold of the electrical parameters.

12. The method according to claim 11, characterized in that, Determining the material activity range of the battery based on the electrical parameters includes: Based on the fact that the electrical parameters are less than a preset parameter threshold, the material activity range of the battery is determined to be the first material activity range; Based on the electrical parameters being greater than or equal to a preset parameter threshold, the material activity range of the battery is determined to be the second material activity range.

13. The method according to claim 1, characterized in that, The electrical parameters include battery voltage or state of charge (SOC).

14. The method according to claim 13, characterized in that, The acquisition of electrical parameters during the battery charging process includes: Obtain the individual cell voltage of each cell contained in the battery; The highest single-cell voltage is selected from the individual cell voltages of each cell and determined as the battery voltage.

15. A battery charging control device, characterized in that, The device includes: The parameter acquisition module is used to acquire the electrical parameters of the battery during the charging process; The interval detection module is used to determine the material activity interval of the battery based on the electrical parameters, wherein the material activity interval reflects the chemical reaction activity of the battery under the corresponding electrical parameters; A charging control module is used to charge the battery based on a charging strategy corresponding to the active range of the material. The step of charging the battery based on a charging strategy corresponding to the active range of the material includes: determining that the active range of the material is the lithium manganese phosphate material range; using the maximum output current of the charging device as the charging current to charge the battery until the battery voltage meets the full charge cutoff condition; and performing multiple constant voltage charging operations according to the preset full charge cutoff voltage. The step of performing multiple constant-voltage charging according to a preset full-charge cutoff voltage includes: The fluctuation range of the battery voltage is determined based on the full charge cutoff voltage. The maximum output current of the charging device is used as the initial charging current for constant voltage charging, and the charging current is gradually reduced according to the first battery state to maintain the battery voltage within the floating range.

16. A computing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method as described in any one of claims 1-14.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by a processor, it implements the steps of the method as described in any one of claims 1-14.

18. An electrical appliance, characterized in that, Includes the computing device as described in claim 16.

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