Battery control method, battery controller and readable storage medium

Abstract

A battery control method, comprising: acquiring current usage information of a vehicle (S101); on the basis of the current usage information, querying a preset charging SOC upper limit correction table to acquire an SOC upper limit value (S102); on the basis of the current usage information and preset cumulative temperature coefficients, querying a preset SOH data table to determine an SOH correction value (S103); using the SOC upper limit value of a battery to correct a charging voltage in a battery MAP, and using the SOH correction value to correct a charging current and a charging / discharging power in the battery MAP (S104); and using a corrected MAP to control the operation of the battery (S105). Further disclosed are a battery controller and a computer-readable storage medium. The control method can prolong the service life of a battery and improve the usage experience of a user.

Description

Battery control method, controller and readable storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 10, 2024, with application number 202411267405.1. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The embodiments of the present application relate to the field of battery technology, for example, to a battery control method, a controller, and a readable storage medium.

[0004] Background Art

[0005] At present, in the battery control process, the attenuation changes of the battery throughout its life cycle are not taken into consideration. Therefore, the battery charging and discharging usage strategy will lead to frequent user perceptions such as fault alarms and safety accidents throughout the battery life cycle.

[0006] Technical issues

[0007] Related technologies employ overly stringent capacity and voltage limiting strategies without considering the degradation characteristics of battery cells throughout their lifecycle. This can lead to a dramatic drop in range, leading to user concerns about "battery lockout." Alternatively, overly aggressive charging current / power limits can lead to extended charging times, raising questions about battery quality and safety. This not only impacts battery lifespan but also creates a poor user experience.

[0008] Technical Solutions

[0009] The present application provides a battery control method, which includes: obtaining current usage information of a vehicle, wherein the current usage information includes at least years of use, mileage, and cumulative charging capacity; querying a preset charging SOC upper limit correction table based on the current usage information to obtain an SOC upper limit value, wherein the charging SOC upper limit correction table is the SOC upper limit value of the battery at different usage stages determined based on historical usage data of the vehicle; querying a preset SOH data table based on the current usage information and a preset cumulative temperature coefficient to determine an SOH correction value, wherein the SOH data table includes an SOH cycle data table determined based on the cumulative charging capacity of the vehicle and an SOH calendar data table determined based on the years of use of the vehicle, and the preset cumulative temperature coefficient is a coefficient corresponding to different temperatures set based on a preset reference temperature; using the battery's SOC upper limit value to correct the charging voltage in the battery MAP, and using the SOH correction value to correct the charging current and charge and discharge power in the battery MAP; and using the corrected MAP to control the battery operation.

[0010] An embodiment of the present application also provides a battery controller, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute a battery control method.

[0011] An embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions. The computer instructions are used to implement a battery control method when executed by a processor.

[0012] Beneficial effects

[0013] This application determines the battery's SOC upper limit and SOH correction value based on the vehicle's current usage information, and uses the SOC upper limit and SOH correction value to correct the battery's MAP, avoiding the problem in related technologies that the battery's attenuation changes are not considered during the battery usage control process, thereby affecting the battery's service life and user experience. It can extend the battery's service life and improve the user's experience.

[0014] BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a flow chart of a battery control method provided by some implementations of the present application;

[0016] FIG2 is a structural diagram of a battery control device provided by some implementations of the present application;

[0017] FIG3 is a schematic diagram of the structure of a battery controller provided in some implementations of the present application.

[0018] Modes for Carrying Out the Invention

[0019] The present application will be described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended to explain the present application, rather than to limit it. It should also be noted that, for ease of description, the accompanying drawings illustrate only some, but not all, structures relevant to the present application.

[0020] It should be noted that the terms "first," "second," and so on in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to limit a specific order. Each embodiment of this application can be implemented independently, and multiple embodiments can also be implemented in combination with each other. This embodiment of this application does not impose specific limitations on this.

[0021] Ternary lithium batteries experience a certain degree of capacity decay over time. If charging continues at a high state-of-charge (SOC) cutoff voltage, phase transitions are likely to occur, causing the unit cell to shrink and expand along the a- and c-axes. As cycling progresses, when stress accumulates to a certain level, the electrode material can crack, exacerbating side reactions with the electrolyte. These side reactions can lead to loss of active lithium, and the side reaction products can easily block lithium-ion transport channels, significantly impacting the battery's service life.

[0022] Moreover, when the battery is at high SOC, both the electrolyte and the negative electrode material have more active lithium. In particular, the energy density of the ternary lithium battery material itself is higher. Compared with the lithium iron phosphate battery, it can accommodate more energy in the same volume. When the battery experiences thermal runaway, all the active lithium will participate in the exothermic reaction, generating more heat and leading to higher temperatures, which affects the service life of the ternary lithium battery.

[0023] FIG1 is a flow chart of a battery control method provided by some implementations of the present application.

[0024] As shown in FIG1 , the battery control method specifically includes the following steps:

[0025] S101, obtaining current usage information of the vehicle, wherein the current usage information at least includes age, mileage, and accumulated charging capacity.

[0026] By obtaining the vehicle's current usage information, the battery usage and thus the battery degradation can be indirectly determined. The vehicle's age also represents the battery's age, and the vehicle's cumulative charge capacity is the battery's cumulative charge capacity.

[0027] S102, querying a preset charging SOC upper limit correction table based on current usage information to obtain an SOC upper limit value, wherein the charging SOC upper limit correction table is the SOC upper limit value of the battery at different usage stages determined based on historical usage data of the vehicle.

[0028] Table 1 shows the SOC upper limits for a certain type of ternary lithium battery at different stages of use, determined based on the vehicle's historical usage data. This is a pre-set charging SOC upper limit correction table. As can be seen from Table 1, each SOC upper limit corresponds to a specific age, mileage, and cumulative charge capacity.

[0029] Table 1. Charging SOC upper limit correction table

[0030]

[0031] In one possible implementation, the basis for establishing the charging SOC upper limit correction table includes: determining the SOC upper limit value of the battery at each set time based on the set time within the entire life cycle of the battery, wherein the set time includes at least: the three-guarantee period of the vehicle, the warranty period of the battery, and the design life of the battery; between two set times, determining the SOC upper limit value of the battery, including: allocating the SOC upper limit value at each moment between the two set times based on the cycle attenuation trend of the battery, or using the linear difference method to allocate the SOC upper limit value at each moment between the two set times.

[0032] In one possible implementation, determining the SOC upper limit value of a battery based on the warranty period of the battery includes: obtaining the actual SOH of the battery; determining whether the actual SOH is greater than or equal to the theoretical SOH corresponding to the warranty period of the battery; in response to the actual SOH being greater than or equal to the theoretical SOH corresponding to the warranty period of the battery, correcting the SOC upper limit value of the battery to the actual SOH; in response to the actual SOH being less than the theoretical SOH corresponding to the warranty period of the battery, correcting the SOC upper limit value of the battery to the theoretical SOH.

[0033] Because batteries experience varying degrees of capacity decay at different stages of use, the battery's SOC upper limit can be adjusted based on the battery's vehicle usage time and capacity decay. For example, the vehicle's warranty period, the battery's warranty period, and the battery's design life can be used as the set time.

[0034] In one possible implementation, a vehicle's warranty period could be 2 years and 40,000 kilometers. Battery capacity degradation is minimal during this period, so the SOC upper limit is typically not adjusted during the warranty period, as shown in Table 1. For example, if a battery's factory SOC upper limit is 100%, the SOC upper limit remains unchanged at 100% during the 2-year and 40,000-kilometer warranty period.

[0035] The battery warranty period is 8 years and 160,000 kilometers. (See Table 1.) At the end of the battery warranty, the battery's SOC upper limit must be adjusted to align with its actual State of Health (SOH). For example, if the battery reaches 8 years or the vehicle has driven 160,000 kilometers (whichever comes first), the battery's SOH can theoretically reach SOH ≥ 80%. If the battery's actual SOH is 85% at this time, the battery's SOC upper limit will be adjusted based on the actual SOH. That is, the battery's SOC after 8 years and 160,000 kilometers will be adjusted to 85%.

[0036] The design life of the battery can be 15 years and 300,000 kilometers. Refer to Table 1. The SOC upper limit value of the final stage is determined according to the end of the battery design life. When the battery design life is exceeded, the SOC upper limit value of the battery is corrected according to the battery design life SOH value. For example, it is set that when the battery design life is reached, the battery SOH reaches 60%, then the battery after this period will maintain the SOC upper limit value of 60%.

[0037] The range between the vehicle's warranty period, the battery's warranty period, and the battery's design life can be allocated based on the battery's cycle decay trend or by linear interpolation. The frequency of correction can be adjusted based on actual needs. Table 1 shows an example of allocating an SOC upper limit using linear interpolation. In one possible implementation, the SOC upper limit is determined by linear interpolation at a frequency of 1 year and 20,000 kilometers between the battery's warranty period of 8 years and 160,000 kilometers and the battery's design life of 15 years and 300,000 kilometers.

[0038] In one possible implementation, the cumulative charge capacity in Table 1 is calculated according to the formula Calculated, where P is the energy consumption of the battery, U is the nominal voltage of the battery, η is the charge and discharge efficiency, M is the mileage, and C is the cumulative charge capacity.

[0039] For example, for a certain type of ternary lithium battery, P=17kWh / 100km, U=400V, and η=95%, the cumulative charging capacity C corresponding to M=40,000km is approximately 17,895Ah.

[0040] It should be noted that for batteries, the cutoff voltage used for slow charging or fast charging to achieve the same SOC value is different. Therefore, in order to maintain the consistency of the SOC upper limit value, when the battery uses different charging methods, the corresponding fast charging SOC-OCV (Open Circuit Voltage) curve and slow charging SOC-OCV curve can be queried to find the corresponding cutoff voltage, and the queried cutoff voltage can be used to correct the battery's upper limit SOC.

[0041] In addition, in order to reduce calculations, Table 1 sets the principle of no interpolation within the interval. For example, when the cumulative charging capacity is 17895Ah≤cumulative charging capacity<35789Ah, the SOC upper limit value is still implemented at 97%.

[0042] In the embodiment of the present application, by correcting the upper limit of the charging SOC in each use stage, and based on gradually reducing the charging cutoff SOC and voltage according to the mileage and years of use of the vehicle, the probability of phase change of the ternary lithium material can be effectively reduced, and the reliability of the service life can be increased.

[0043] S103, based on the current usage information and the preset cumulative temperature coefficient, query the preset SOH data table to determine the SOH correction value, wherein the SOH data table includes an SOH cycle data table determined based on the cumulative charging capacity of the vehicle and an SOH calendar data table determined based on the service life of the vehicle, and the preset cumulative temperature coefficient is a coefficient corresponding to different temperatures set based on the preset reference temperature.

[0044] In one possible implementation, SOH can be calculated over the battery's lifecycle from both a cyclic and calendar perspective. Cycling determines the battery's SOH based on different cumulative charge capacities, while calendar determines the battery's SOH based on years of non-use. The corrected SOH value is calculated by adding together the losses from cyclic and calendar SOH: corrected SOH = 1 - (1 - SOH cycles) - (1 - SOH calendar). The preset cumulative temperature coefficient is a pre-set coefficient corresponding to different ambient temperatures based on a preset temperature value.

[0045] S104 , using the battery SOC upper limit value to correct the charging voltage in the battery MAP, and using the SOH correction value to correct the charging current and charging / discharging power in the battery MAP.

[0046] S105 , using the corrected MAP to control battery operation.

[0047] In one possible implementation, the power map (MAP) represents the different charge and discharge capabilities of a battery system at different temperatures and SOC conditions. Correction of the SOC upper limit requires adjustment of the charging voltage, or cutoff voltage. As the battery cell ages, its charge and discharge capabilities decrease. Therefore, the power P and current I in the MAP need to decay proportionally with the SOH. The fast-charging strategy's charging current and pulse charge and discharge power are both corrected with the SOH, using the following formula:

[0048] I 修正 =I BOL ×SOH 修正 ;

[0049] P 修正 =P BOL ×SOH 修正 ;

[0050] Among them, I BOL is the current I in MAP, P BOL is the power P in MAP, SOH 修正 is the SOH correction value, I 修正 is the current in the corrected MAP, P 修正is the power in the corrected MAP.

[0051] This application determines the battery's SOC upper limit and SOH correction value based on the vehicle's current usage information, and uses the SOC upper limit and SOH correction value to correct the battery's MAP, avoiding the problem in related technologies that the battery's attenuation changes are not considered during the battery usage control process, thereby affecting the battery's service life and user experience. It can extend the battery's service life and improve the user's experience.

[0052] Based on multiple technical solutions, S103, based on the current usage information and the preset cumulative temperature coefficient, querying a preset SOH data table to determine the SOH correction value includes:

[0053] Based on the cumulative charging capacity and the preset cumulative temperature coefficient, the SOH cycle data table is queried to obtain the cycle SOH value; based on the service life and the preset cumulative temperature coefficient, the preset SOH calendar data table is queried to obtain the calendar SOH value; and the SOH correction value is determined using the cycle SOH value and the calendar SOH value.

[0054] In a possible implementation, determining the SOH correction value using the cyclic SOH value and the calendar SOH value includes: determining the SOH correction value using a formula: SOH correction value=1-(1-cyclic SOH value)-(1-calendar SOH value).

[0055] In a possible implementation, see Table 2 and Table 3. Table 2 is the SOH cycle data table, and Table 3 is the SOH calendar data table. Table 2 is the SOH cycle data table of a certain type of battery based on the actual battery cycle attenuation or simulation results. Table 2 is queried based on the cumulative charging capacity of the vehicle. Some values ​​in Table 2 can also be calculated using linear interpolation. For example, when the cumulative charging capacity is ≤1342Ah, the SOH 循环 =100%, SOH 循环 is the cycle SOH value; when the cumulative charging capacity is greater than 1342Ah, the SOH correction value of each stage is calculated by linear interpolation. Table 3 is the SOH calendar data table of a certain type of battery based on the actual calendar attenuation of the battery or the simulation results. According to the age of the vehicle, query Table 3. Among them, some values ​​in Table 3 can also be calculated using linear interpolation. For example, when the age is ≤ 0.17 years (2 months), the SOH 日历 =100%, SOH 日历 It is the calendar SOH value; when the service life is greater than 0.17 years, the SOH correction value of each stage is calculated by linear interpolation method.

[0056] Table 2. SOH cycle data table

[0057]

[0058] Table 3. SOH calendar data table

[0059]

[0060] In one possible implementation, before S103 queries the preset SOH data table based on the current usage information and the preset cumulative temperature coefficient, the control method also includes: obtaining the current ambient temperature of the vehicle; using the current ambient temperature to query the preset temperature coefficient table to determine the preset cumulative temperature coefficient corresponding to the current ambient temperature.

[0061] For example, Table 4 is a table of temperature coefficients under different temperature cumulative charging capacities. Taking the normal temperature of 25°C as the benchmark, the temperature cumulative coefficient of the system during the normal temperature 25°C fast charging cycle is set to 1, and the coefficients below this temperature are all set to 1; the calculation of the high temperature cumulative coefficient can be confirmed based on the cumulative charging capacity ratio under the same SOH. For example: m (45°C) = cumulative charging capacity at 25°C / cumulative charging capacity at 45°C = 2, then the temperature coefficient Table 4 is obtained. Among them, the cumulative charging capacity takes into account the cumulative charging ampere-hours (including feedback). According to the highest temperature of the battery cell during the operation of the whole vehicle, the preset cumulative temperature coefficient m (linear interpolation between temperatures) of different temperatures is calculated, Ah 累计 =∑(m×Ah0), where Ah0 is the cumulative charging capacity in Table 2, Ah 累计 is the first accumulated value.

[0062] Table 4. Temperature coefficient table (accumulated charge capacity at different temperatures)

[0063]

[0064] For example, Table 5 is a table of temperature coefficients under different accumulated years of temperature. Taking room temperature of 25°C as the benchmark, the temperature accumulation coefficient of the system during the fast charge cycle at room temperature of 25°C is set to 1, and the coefficients below this temperature are all set to 1; the calculation of the high temperature accumulation coefficient can be confirmed based on the time ratio under the same SOH. For example: k(45°C) = storage time at 25°C / storage time at 45°C = 2, then the temperature coefficient table 5 is obtained. According to the average temperature of the battery cell, refer to Table 5 and calculate the preset cumulative temperature coefficient k for different temperatures (linear interpolation between temperatures). T 累计 =∑(k×T0), where T0 is the service life in Table 3, T 累计 is the second accumulated value.

[0065] Table 5. Temperature coefficient table (accumulated years at different temperatures)

[0066]

[0067] In one possible implementation, querying a pre-set SOH data table based on the current usage information and a preset cumulative temperature coefficient to determine the SOH correction value includes determining the SOH correction value based on the first accumulated value or the second accumulated value. In other words, the SOH correction value can be determined using either the first accumulated value or the second accumulated value.

[0068] In one possible implementation, after determining the upper limit of the battery SOC at S103, if the battery is charged using a fast charge mode, the control method further includes:

[0069] The battery's SOC upper limit is used to query a pre-set charging rate plan table to determine the fast charge cutoff rate and retirement cutoff rate corresponding to the battery's SOC upper limit. The charging rate plan table is a charging rate table corresponding to different SOC ranges determined based on the battery's factory parameters. The charging rate plan table is provided with fast charge cutoff rates and retirement cutoff rates corresponding to different SOC ranges. The retirement cutoff rate corresponding to an SOC range includes all fast charge cutoff rates that are higher than the fast charge cutoff rates corresponding to the corresponding SOC range. The battery is charged using the fast charge cutoff rate until the cutoff voltage corresponding to the battery's SOC upper limit is reached. The battery is charged in sequence using each charging rate in the retirement cutoff rate, and each time is charged to the cutoff voltage corresponding to the battery's SOC upper limit.

[0070] In one possible implementation, in order to avoid the poor user experience of shorter charging time and a sudden drop in cruising range due to the reduction of the charging upper limit SOC and the cut-off voltage after the SOC upper limit value is corrected, the charging time can be kept within a certain range while lowering the cut-off voltage within the life cycle by increasing the small current replenishment method at the fast charging end. On the one hand, it improves the experience of shorter charging time, and on the other hand, it reduces the situation where the charging energy drops sharply due to the voltage limit.

[0071] In one possible implementation, Table 6 is a table of charging rate plans for a certain type of battery at a temperature of 25°C. After determining the corresponding SOC upper limit value, the SOC upper limit value is used to query Table 6 to determine the fast charge cutoff rate and retirement cutoff rate corresponding to the battery's SOC upper limit value. Then, after charging to the SOC upper limit value using the fast charge cutoff rate, continue to charge to the voltage value corresponding to the SOC upper limit value using the retirement cutoff rate. For example, when the SOC upper limit value is corrected to 85%, according to the charging plan in Table 6, charge to the cutoff voltage corresponding to 85% SOC at a fast charge cutoff rate of 0.50C, then charge again to the cutoff voltage corresponding to 85% SOC at a retirement cutoff rate of 0.33C, and finally charge again to the cutoff voltage corresponding to 85% SOC at a retirement cutoff rate of 0.15, completing the entire charging process.

[0072] Table 6. Charging rate plan

[0073]

[0074] In one possible implementation, S102 specifically includes: querying a preset charging SOC upper limit correction table based on the current usage information, whichever of the usage years, mileage, and cumulative charging capacity reaches the corresponding usage stage first, to determine the SOC upper limit value.

[0075] In one possible implementation, because a vehicle may be older but have shorter mileage, the SOC upper limit is determined based on the first-reached condition among age, mileage, and cumulative charge capacity. For example, if a vehicle is three years old, has traveled over 30,000 kilometers, and has a cumulative charge capacity of approximately 16,000 Ah, then the age of the vehicle will prioritize reaching the second range in Table 1. Therefore, the SOC upper limit is determined to be 97% based on the three-year age range.

[0076] In the embodiment of the present application, the control method using a battery has the following advantages:

[0077] (1) Extending the service life of the battery. Ternary lithium battery materials are prone to phase change at high SOC cut-off voltages. Phase change causes the unit cell to shrink and expand in the a-axis and c-axis directions. As the cycle process continues to deepen, when the stress accumulates to a certain extent, the electrode material will break, exacerbating the side reaction with the electrolyte. The side reaction causes the loss of active lithium. The side reaction products easily lead to the obstruction of lithium ion transmission channels, which greatly affects the service life of the ternary lithium battery.

[0078] By adopting the charging SOC upper limit correction and gradually reducing the charging cutoff SOC and voltage according to the mileage and years of use of the vehicle, the probability of phase change of the ternary lithium material can be effectively reduced and the service life reliability can be increased.

[0079] (2) Improved battery safety. When the battery is at a high SOC, the electrolyte and negative electrode materials have more active lithium. In particular, the energy density of the ternary lithium battery material itself is higher. Compared with lithium iron phosphate batteries, it can hold more energy in the same volume. When the battery experiences thermal runaway, all the active lithium will participate in the exothermic reaction, generating more heat and leading to higher temperatures.

[0080] Lower the upper limit of charging SOC. Batteries with low SOC take longer to absorb heat, thus reaching the critical condition of thermal runaway. As the SOC decreases, the time for thermal runaway to occur in adjacent cells in the entire pack increases, which greatly improves the safety of the entire pack of batteries.

[0081] (3) Improve user experience. In order to avoid the negative user experience of shorter charging times and a sudden drop in mileage due to lowering the upper limit of charging SOC and voltage, this application adds a small current charging at the end of fast charging. Under the premise of lowering the cut-off voltage within the life cycle, the charging time is kept within a certain range, improving the experience of shorter charging times and reducing the situation where the charging energy drops sharply due to voltage limiting. Compared with other retirement strategies, this application starts from the characteristics of ternary lithium battery materials and improves the service life and safety of the battery itself while improving the user experience.

[0082] FIG2 is a structural diagram of a battery control device provided in some implementations of the present application.

[0083] As shown in Figure 2, the battery control device specifically includes:

[0084] An information acquisition unit 21 is configured to acquire current usage information of the vehicle, wherein the current usage information includes at least age, mileage, and accumulated charging capacity;

[0085] An SOC correction unit 22 is configured to query a preset charging SOC upper limit correction table based on current usage information to obtain an SOC upper limit value, wherein the charging SOC upper limit correction table is a table of battery SOC upper limits for different usage stages determined based on historical usage data of the vehicle;

[0086] An SOH correction unit 23 is configured to query a preset SOH data table based on current usage information and a preset cumulative temperature coefficient to determine an SOH correction value, wherein the SOH data table includes an SOH cycle data table determined based on the cumulative charging capacity of the vehicle and an SOH calendar data table determined based on the age of the vehicle, and the preset cumulative temperature coefficient is a coefficient corresponding to different temperatures set based on a preset reference temperature;

[0087] The MAP correction unit 24 is used to correct the charging voltage in the battery MAP using the battery SOC upper limit value, and to correct the charging current and charge / discharge power in the battery MAP using the SOH correction value;

[0088] The battery control unit 25 is used to control the battery operation using the corrected MAP.

[0089] In a possible implementation, the SOH correction unit 23 includes:

[0090] a cycle SOH determination subunit, configured to query an SOH cycle data table based on the cumulative charge capacity and a preset cumulative temperature coefficient to obtain a cycle SOH value;

[0091] A calendar SOH determination subunit is used to query a preset SOH calendar data table based on the service life and a preset cumulative temperature coefficient to obtain a calendar SOH value;

[0092] The SOH correction subunit is used to determine the SOH correction value using the cyclic SOH value and the calendar SOH value.

[0093] In a possible implementation, the SOC correction unit 22 is specifically configured to:

[0094] Based on the current usage information, the one of the usage years, mileage and cumulative charging capacity that reaches the corresponding usage stage first is queried to determine the SOC upper limit value.

[0095] In one possible implementation, after the SOC correction unit 22 determines the SOC upper limit value of the battery, if the battery is charged using a fast charge mode, the control device further includes:

[0096] a charging rate determination unit, configured to query a pre-set charging rate plan table using the battery's SOC upper limit value to determine a fast charge cutoff rate and a retirement cutoff rate corresponding to the battery's SOC upper limit value, wherein the charging rate plan table is a charging rate table corresponding to different SOC intervals determined based on factory parameters of the battery, and the charging rate plan table is provided with fast charge cutoff rates and retirement cutoff rates corresponding to different SOC intervals, and the retirement cutoff rate corresponding to an SOC interval includes all fast charge cutoff rates that are higher than those corresponding to the corresponding SOC interval;

[0097] a first charging control unit, configured to charge the battery using a fast charge cutoff rate until a cutoff voltage corresponding to an upper limit value of the battery's SOC is reached;

[0098] The second charging control unit is used to charge the battery in sequence using each charging rate in the retirement cut-off rate, and each time charging the battery to a cut-off voltage corresponding to the SOC upper limit value of the battery.

[0099] In a possible implementation, before the SOH correction unit 23 queries a preset SOH data table based on the current usage information and the preset cumulative temperature coefficient, the control device further includes:

[0100] A temperature acquisition unit, used to obtain the current ambient temperature of the vehicle;

[0101] The temperature coefficient determination unit is used to query a preset temperature coefficient table using the current ambient temperature to determine a preset cumulative temperature coefficient corresponding to the current ambient temperature.

[0102] In a possible implementation, the SOH correction subunit is specifically configured to:

[0103] Determine the SOH correction value using the formula SOH correction value = 1-(1-cycle SOH value)-(1-calendar SOH value).

[0104] The battery control device provided in some implementations of the present application can execute the battery control method provided in any embodiment of the present application, and has the corresponding functional modules and beneficial effects of the execution method.

[0105] FIG3 is a block diagram of a controller for a battery provided in some implementations of the present application. The controller can be any form of digital computer, such as a laptop computer, desktop computer, workstation, personal digital assistant, server, blade server, mainframe computer, and other suitable computers. The electronic device can also be any form of mobile device, such as a personal digital assistant, cellular phone, smartphone, wearable device (such as a helmet, glasses, watch, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are provided as examples and are not intended to limit the implementation of the present application described and / or claimed herein.

[0106] As shown in Figure 3, the battery controller 10 includes at least one processor 11 and memory, such as a read-only memory (ROM) 12 and a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded from the storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0107] Several components in the battery controller 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the battery controller 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0108] Processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 executes the various methods and processes described above, such as the battery control method.

[0109] In some embodiments, the battery control method can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on battery controller 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the battery control method described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the battery control method in any other suitable manner (e.g., via firmware).

[0110] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system on chips (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0111] Computer programs for implementing the methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0112] In the context of this application, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or apparatus. A computer-readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A machine-readable storage medium may include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM) or flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of content.

[0113] To provide for user interaction, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a cathode ray tube (CRT) or a liquid crystal display (LCD) monitor) configured to display information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be configured to provide for user interaction; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and the input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0114] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: Local Area Networks (LANs), Wide Area Networks (WANs), blockchain networks, and the Internet.

[0115] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship is established by computer programs running on the respective computers. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem, addressing the management difficulties and limited scalability of traditional physical hosts and virtual private server (VPS) services.

Claims

1. A battery control method, comprising: Obtaining current usage information of the vehicle, wherein the current usage information includes at least age, mileage, and cumulative charging capacity; querying a preset charging SOC upper limit correction table based on the current usage information to obtain an SOC upper limit value, wherein the charging SOC upper limit correction table is a table of SOC upper limits of the battery at different usage stages determined based on historical usage data of the vehicle; Based on the current usage information and a preset cumulative temperature coefficient, a preset SOH data table is searched to determine an SOH correction value, wherein the SOH data table includes an SOH cycle data table determined based on the cumulative charging capacity of the vehicle and an SOH calendar data table determined based on the age of the vehicle, and the preset cumulative temperature coefficient is a coefficient corresponding to different temperatures set based on a preset reference temperature; Using the battery's SOC upper limit value to correct the charging voltage in the battery MAP, and using the SOH correction value to correct the charging current and charging and discharging power in the battery MAP; The battery operation is controlled using the corrected MAP.

2. The battery control method according to claim 1, wherein: Querying a preset SOH data table based on the current usage information and the preset cumulative temperature coefficient to determine the SOH correction value includes: Querying the SOH cycle data table based on the cumulative charging capacity and a preset cumulative temperature coefficient to obtain a cycle SOH value; Based on the service life and the preset cumulative temperature coefficient, a preset SOH calendar data table is searched to obtain a calendar SOH value; The SOH correction value is determined using the cyclic SOH value and the calendar SOH value.

3. The battery control method according to claim 1, wherein: The basis for establishing the charging SOC upper limit correction table includes: Determine the upper limit of the battery's SOC at each set time based on set times within the battery's full life cycle, wherein the set time includes at least: the vehicle's "Three Guarantees" period, the battery's warranty period, and the battery's design life; Determining the upper limit of the SOC of the battery between the two set times includes: allocating the upper limit of the SOC at each moment between the two set times based on the cycle attenuation trend of the battery, or allocating the upper limit of the SOC at each moment between the two set times using a linear difference method.

4. The battery control method according to claim 3, wherein: Determining the battery's SOC upper limit based on the battery's warranty period includes: Get the actual SOH of the battery; Determining whether the actual SOH is greater than or equal to the theoretical SOH corresponding to the warranty period of the battery; In response to the actual SOH being greater than or equal to a theoretical SOH corresponding to the warranty period of the battery, correcting the SOC upper limit value of the battery to the actual SOH; In response to the actual SOH being less than a theoretical SOH corresponding to the warranty period of the battery, the SOC upper limit value of the battery is corrected to the theoretical SOH.

5. The battery control method according to any one of claims 1 to 4, wherein: Querying a preset charging SOC upper limit correction table based on the current usage information to obtain the SOC upper limit value includes: Based on the current usage information, the one of the usage years, the mileage, and the accumulated charging capacity that reaches the corresponding usage stage first is queried in a preset charging SOC upper limit correction table to determine the SOC upper limit value.

6. The battery control method according to any one of claims 1 to 4, wherein: After determining the upper limit of the SOC of the battery, if the battery is charged using a fast charge mode, the control method further includes: Utilizing the SOC upper limit value of the battery to query a pre-set charging rate plan table, determining the fast charge cut-off rate and the retirement cut-off rate corresponding to the SOC upper limit value of the battery, wherein the charging rate plan table is a charging rate table corresponding to different SOC intervals determined based on the factory parameters of the battery, and the charging rate plan table is provided with fast charge cut-off rates and retirement cut-off rates corresponding to different SOC intervals, and the retirement cut-off rate corresponding to an SOC interval includes all fast charge cut-off rates higher than the corresponding SOC interval; Charging the battery using the fast charge cutoff rate until the cutoff voltage corresponding to the SOC upper limit value of the battery is reached; The battery is charged in sequence using each charging rate in the retirement cut-off rate, and each time the battery is charged to a cut-off voltage corresponding to the upper limit value of the SOC of the battery.

7. The battery control method according to any one of claims 1 to 4, wherein: Before querying a preset SOH data table based on the current usage information and the preset cumulative temperature coefficient, the control method further includes: Get the current ambient temperature of the vehicle; The preset temperature coefficient table is searched using the current ambient temperature to determine a preset cumulative temperature coefficient corresponding to the current ambient temperature.

8. The battery control method according to claim 2, wherein: Determining the SOH correction value using the cyclic SOH value and the calendar SOH value includes: The SOH correction value is determined using the formula SOH correction value=1-(1-cycle SOH value)-(1-calendar SOH value).

9. A battery controller, comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the battery control method according to any one of claims 1 to 8.

10. A computer-readable storage medium storing computer instructions, wherein the computer instructions are configured to enable a processor to implement the battery control method according to any one of claims 1 to 8 when executed.

Images