Control method and device for charging and discharging power of auxiliary power battery and electronic equipment

Abstract

The invention relates to a control method and device for charging and discharging power of an auxiliary power battery and electronic equipment, and belongs to the technical field of automobile batteries, and the method comprises the steps: obtaining external discharging power and charging power according to a minimum residual electric quantity limit value, an expected residual electric quantity value and a real-time residual electric quantity value, obtaining an expected residual electric quantity value according to the maximum residual electric quantity limit value and the minimum residual electric quantity limit value, and performing charging and discharging operation on the auxiliary power battery according to the expected residual electric quantity value, the real-time residual electric quantity value, the external discharging power and the charging power; the auxiliary power battery can be charged and discharged at proper time and proper power, meanwhile, the situation that the auxiliary power battery is in a low SOC or high SOC state for a long time is effectively avoided, and the cycle life of the power battery is effectively prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of automobile batteries, and in particular to a control method, device and electronic equipment for the charging and discharging power of an auxiliary power battery. Background Art

[0002] Extended-range hybrid vehicles are divided into oil-electric hybrid vehicles and fuel cell vehicles. In extended-range hybrid vehicles, the vehicle uses a range extender or a fuel cell as the main power source. Since the range extender or the fuel cell has a power follow-up problem, the vehicle is often equipped with an auxiliary power battery as an auxiliary power source to play the role of power compensation or surplus energy storage.

[0003] The auxiliary power battery matched with the extended-range hybrid vehicle often has a small storage capacity, and the charging and discharging power when it is needed for power compensation or surplus energy storage is often high. If the auxiliary power battery is charged and discharged at a high power for a long time, or the power battery is kept in a low SOC or high SOC state for a long time, it will cause damage to the auxiliary power battery; SOC, the full name is State of Charge, the battery state of charge, also known as the remaining power; therefore, there is an urgent need for an auxiliary power battery power control method that can control the charging and discharging timing based on the SOC state, and at the same time control the charging and discharging power. Summary of the invention

[0004] To this end, the present invention provides a control method, device and electronic equipment for auxiliary power battery charging and discharging power to solve the problem of battery damage caused by the inability to control charging and discharging timing and charging and discharging power according to the battery SOC state in the prior art.

[0005] In a first aspect, a method for controlling the charging and discharging power of an auxiliary power battery is provided, the method comprising:

[0006] Acquire multiple remaining capacities of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers;

[0007] Obtaining an allowable charging power and an allowable discharging power; the allowable charging power and the allowable discharging power are respectively the minimum charging power and the minimum discharging power required by the vehicle model design;

[0008] Obtaining a maximum remaining power limit value allowed for high-power charging and a minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power;

[0009] Obtaining an expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value;

[0010] The external discharge power and charging power are obtained according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value; the real-time remaining power value is the remaining power value of the auxiliary power battery collected in real time;

[0011] The auxiliary power battery is charged and discharged according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power.

[0012] Further, obtaining the expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value includes:

[0013] The intermediate remaining power value is obtained according to the maximum remaining power limit value and the minimum remaining power limit value. The intermediate remaining power value calculation formula is:

[0014] SOC mid =(SOC top +SOC bot ) / 2;

[0015] Among them, SOC mid The intermediate remaining power value; SOC top SOC is the maximum remaining power limit; bot is the minimum remaining power limit;

[0016] The expected remaining power value is obtained according to the intermediate remaining power value, and the expected remaining power value is calculated by the formula:

[0017] SOC exp =SOC mid ±δ;

[0018] Among them, SOC exp is the expected remaining power value, and δ is the expected factor.

[0019] Furthermore, the value range of the expected factor is: δ≤20%.

[0020] Further, the obtaining of the maximum remaining power limit value allowed for high-power charging and the minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power includes:

[0021] Obtaining the current battery temperature;

[0022] Filtering, according to the current battery temperature, from the plurality of first maximum allowable charging powers and first maximum allowable discharging powers to obtain a plurality of second maximum allowable charging powers and second maximum allowable discharging powers;

[0023] setting the remaining power corresponding to the second maximum allowable charging power equal to the allowable charging power to a maximum remaining power limit;

[0024] The remaining power corresponding to the second maximum allowable discharge power equal to the allowable discharge power is set as a minimum remaining power limit value.

[0025] Furthermore, obtaining the external discharge power and charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value includes:

[0026] Obtaining the current battery temperature;

[0027] Obtaining a third maximum allowable charging power and a third maximum allowable discharging power according to the battery temperature and the real-time remaining power value;

[0028] Obtaining the charging power according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable charging power;

[0029] The external discharge power is obtained according to the minimum remaining power limit value, the expected remaining power value, the real-time remaining power value and the third maximum allowable discharge power.

[0030] Further, obtaining the charging power according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable charging power includes:

[0031] The charging power of the auxiliary power battery during vehicle operation is obtained through the cosine power coefficient algorithm. The charging power calculation formula is:

[0032] P char =cos[(SOC now -SOC exp ) / (SOC exp -SOC bot )×π / 2+π / 2]×P maxchar ;

[0033] Among them, P char is the charging power; SOC now The real-time remaining power value; SOC exp SOC is the expected remaining power value; bot is the minimum remaining power limit; P maxchar is the third maximum permissible charging power.

[0034] Further, the obtaining of the external discharge power according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable discharge power includes:

[0035] The external discharge power of the auxiliary power battery during vehicle operation is obtained through the cosine power coefficient algorithm. The external discharge power calculation formula is:

[0036] P dis = cos[(SOC now -SOC exp ) / (SOC exp -SOC bot )×π / 2+π / 2]×P maxdis ;

[0037] Among them, P dis is the charging power; SOC now The real-time remaining power value; SOC exp SOC is the expected remaining power value; bot is the minimum remaining power limit; P maxdis It is the third maximum allowable discharge power.

[0038] Furthermore, the charging and discharging operation of the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power includes:

[0039] If the real-time remaining power value is greater than the expected remaining power value, controlling the auxiliary power battery to perform a discharge operation at the external discharge power;

[0040] If the real-time remaining power value is less than or equal to the expected remaining power value, the auxiliary power battery is charged with the charging power.

[0041] In a second aspect, a control device for charging and discharging power of an auxiliary power battery is provided, the device comprising:

[0042] An acquisition module is used to acquire multiple remaining capacities of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers; and is also used to acquire allowable charging power and allowable discharging power; the allowable charging power and allowable discharging power are respectively the minimum charging power and the minimum discharging power required by the vehicle model design;

[0043] A power limit module, used for obtaining a maximum remaining power limit value allowed for high-power charging and a minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power;

[0044] A remaining power calculation module, used to obtain an expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value;

[0045] A power calculation module, used to obtain the external discharge power and charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value; the real-time remaining power value is the remaining power value of the auxiliary power battery collected in real time;

[0046] The charging and discharging module is used to perform charging and discharging operations on the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power.

[0047] In a third aspect, an electronic device is provided, including:

[0048] at least one processor; and

[0049] a memory communicatively connected to the at least one processor; wherein,

[0050] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute any of the above-mentioned methods for controlling the charging and discharging power of the auxiliary power battery.

[0051] The present invention adopts the above technical solution and has at least the following beneficial effects:

[0052] Provided are a control method, device and electronic equipment for charging and discharging power of an auxiliary power battery, wherein external discharge power and charging power are obtained according to a minimum remaining power limit, an expected remaining power value and a real-time remaining power value, and an expected remaining power value is obtained according to a maximum remaining power limit and a minimum remaining power limit, and charging and discharging operations are performed on the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power; the auxiliary power battery can be charged and discharged at a suitable power at a suitable time, and the auxiliary power battery is effectively prevented from being in a low SOC or high SOC state for a long time, thereby effectively extending the cycle life of the power battery.

[0053] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 is a flow chart of a method for controlling charging and discharging power of an auxiliary power battery shown in an exemplary embodiment of the present invention;

[0056] Figure 2 is a schematic diagram of a control device for charging and discharging power of an auxiliary power battery shown in an exemplary embodiment of the present invention;

[0057] Figure 3 is a schematic diagram of an electronic device shown in an exemplary embodiment of the present invention;

[0058] Figure 4 is a charging and discharging power coefficient curve of an auxiliary power battery shown in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] In the prior art, extended-range hybrid vehicles are divided into oil-electric hybrid vehicles and fuel cell vehicles. In extended-range hybrid vehicles, the vehicle uses a range extender or a fuel cell as the main power source. Since the range extender or the fuel cell has a problem of slow power following, the vehicle is often equipped with a power battery (lithium battery or nickel-metal hydride battery) as an auxiliary power source to play the role of power compensation or surplus energy storage.

[0061] The power battery of the extended-range hybrid vehicle usually has a small capacity, and the charge and discharge power when it is needed for power compensation or residual energy storage is often high. If the power battery is charged and discharged at high power for a long time, or if the power battery is kept in a low SOC or high SOC state (SOC, the full name is State of Charge, also called the remaining power) for a long time, it will cause great damage to the power battery.

[0062] The embodiments of the present application provide a method, device and electronic device for controlling the charging and discharging power of an auxiliary power battery, wherein the external discharge power and the charging power are obtained according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value, the expected remaining power value is obtained according to the maximum remaining power limit and the minimum remaining power limit, and the auxiliary power battery is charged and discharged according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power; the auxiliary power battery can be charged and discharged at the appropriate time with the appropriate power, and the auxiliary power battery is effectively prevented from being in a low SOC or high SOC state for a long time, thereby ensuring the performance of the auxiliary power battery and extending the cycle life of the power battery.

[0063] The method in this application is described below through specific examples.

[0064] See also Figure 1 , Figure 1 is a flow chart of a method for controlling the charging and discharging power of an auxiliary power battery according to an exemplary embodiment of the present invention, see Figure 1 , the method comprising:

[0065] Step S11, obtaining multiple remaining capacities of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers;

[0066] Step S12, obtaining the allowed charging power and the allowed discharging power; the allowed charging power and the allowed discharging power are respectively the minimum charging power and the minimum discharging power required by the vehicle model design;

[0067] Step S13, obtaining the maximum remaining power limit value allowed for high-power charging and the minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power;

[0068] Step S14, obtaining an expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value;

[0069] Step S15, obtaining the external discharge power and charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value; the real-time remaining power value is the remaining power value of the auxiliary power battery collected in real time;

[0070] Step S16: charging and discharging the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power.

[0071] It should be noted that the method for controlling the charging and discharging power of the auxiliary power battery provided in this embodiment is applicable in specific practice to scenarios including but not limited to: extended-range hybrid vehicles and other vehicles with auxiliary power batteries.

[0072] It can be understood that the control method of the auxiliary power battery charging and discharging power provided in the present embodiment obtains the external discharge power and the charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value, obtains the expected remaining power value according to the maximum remaining power limit and the minimum remaining power limit, and performs charge and discharge operations on the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power; the auxiliary power battery is realized to be charged and discharged at the appropriate time and with the appropriate power, and at the same time, the auxiliary power battery is effectively prevented from being in a low SOC or high SOC state for a long time, which can ensure the performance of the auxiliary power battery and extend the cycle life of the power battery.

[0073] In specific practice, in step S11, "obtaining multiple remaining powers of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers" is measured by a charging test cabinet to measure multiple remaining powers at different battery temperatures and the maximum allowable charging power and maximum allowable discharging power corresponding to each remaining power.

[0074] In specific practice, the allowable charging power and the allowable discharging power in the step of "obtaining the allowable charging power and the allowable discharging power" in step S12 are respectively the minimum charging power and the minimum discharging power required by the vehicle model design.

[0075] In specific practice, step S13 of "obtaining the maximum remaining power limit allowed for high-power charging of the auxiliary power battery and the minimum remaining power limit allowed for high-power discharging based on the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power" includes: obtaining the current battery temperature; screening out multiple second maximum allowed charging powers and second maximum allowed discharging powers from multiple first maximum allowed charging powers and first maximum allowed discharging powers based on the current battery temperature; setting the remaining power corresponding to the second maximum allowed charging power equal to the allowed charging power to the maximum remaining power limit; setting the remaining power corresponding to the second maximum allowed discharge power equal to the allowed discharge power to the minimum remaining power limit.

[0076] In specific practice, in step S14, "obtaining an expected remaining power value according to the maximum remaining power limit and the minimum remaining power limit" includes: obtaining an intermediate remaining power value according to the maximum remaining power limit and the minimum remaining power limit, and the intermediate remaining power value is calculated by the formula:

[0077] SOC mid =(SOC top +SOC bot ) / 2;

[0078] Among them, SOC mid The intermediate remaining power value; SOC top SOC is the maximum remaining power limit; bot is the minimum remaining power limit;

[0079] The expected remaining power value is obtained based on the intermediate remaining power value. The calculation formula for the expected remaining power value is:

[0080] SOC exp =SOC mid ±δ;

[0081] Among them, SOC exp is the expected remaining power value, and δ is the expected factor.

[0082] It should be noted that the expected factor can be set according to specific project requirements, and the expected factor δ is ≤ 20%.

[0083] In specific practice, step S15 of "obtaining external discharge power and charging power based on the minimum remaining power limit, the expected remaining power value and the real-time remaining power value" includes: obtaining the current battery temperature; obtaining the third maximum allowable charging power and the third maximum allowable discharge power based on the battery temperature and the real-time remaining power value; obtaining the charging power based on the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable charging power; obtaining the external discharge power based on the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable discharge power.

[0084] Specifically, the charging power is obtained according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable charging power, including: obtaining the charging power of the auxiliary power battery during the operation of the vehicle by a cosine power coefficient algorithm, and the charging power calculation formula is:

[0085] P char = cos[(SOC now -SOC exp ) / (SOC exp -SOC bot )×π / 2+π / 2]×P maxchar ;

[0086] Among them, P char is the charging power; SOC now The real-time remaining power value; SOC exp SOC is the expected remaining power value; bot is the minimum remaining power limit; P maxchar is the third maximum permissible charging power.

[0087] Specifically, the external discharge power is obtained according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable discharge power, including: obtaining the external discharge power of the auxiliary power battery during the operation of the vehicle through a cosine power coefficient algorithm, and the external discharge power calculation formula is:

[0088] P dis = cos[(SOC now -SOC exp ) / (SOC exp -SOC bot )×π / 2+π / 2]×P maxdis ;

[0089] Among them, P dis is the charging power; SOC nowThe real-time remaining power value; SOC exp SOC is the expected remaining power value; bot is the minimum remaining power limit; P maxdis It is the third maximum allowable discharge power.

[0090] In specific practice, step S16 of "charging and discharging the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power" includes: if the real-time remaining power value is greater than the expected remaining power value, the auxiliary power battery is controlled to discharge with the external discharge power; if the real-time remaining power value is less than or equal to the expected remaining power value, the auxiliary power battery is charged with the charging power.

[0091] It can be understood that the control method of the auxiliary power battery charging and discharging power provided in this embodiment ensures that the power battery can be charged and discharged at an appropriate power and will be in an appropriate SOC state for a long time, thereby extending the cycle life of the auxiliary power battery.

[0092] In a specific embodiment, the extended-range hybrid vehicle uses a 2kWh auxiliary power battery. After being measured by a charge and discharge test cabinet, the maximum SOC limit of the auxiliary power battery allowed for high-power charging is set to 80%, and the minimum SOC limit allowed for high-power discharge is set to 20%. Based on this, the median SOC of the interval in which the auxiliary power battery is allowed to be charged and discharged at high power is calculated. mid is 50%, which is also set as the expected value during the operation of the power battery, that is, δ=0, SOC exp It is 50%, which is very beneficial to maintaining the performance and cycle life of the power battery near this value.

[0093] According to the above data, the cos[(SOC now -SOC exp ) / (SOC mid -SOC exp ×π / 2+π / 2] cosine power coefficient algorithm is used to calculate the power coefficient curve of the power battery charging interval and discharging interval, such as Figure 4 As shown by the black line, Figure 4 is a charge and discharge power coefficient curve of an auxiliary power battery shown in an exemplary embodiment of the present invention, from Figure 4 It can be seen that whether in the charging range or the discharging range of the power battery, when the SOC of the power battery deviates from the expected value SOC exp(50%) is far away, the vehicle will charge or discharge the power battery with a larger power coefficient, so that the SOC of the power battery can migrate to the expected value as soon as possible, thereby improving the performance and life of the power battery; when the SOC of the power battery gradually approaches the expected value, the power coefficient gradually decreases, and the vehicle charges or discharges the power battery with a smaller power coefficient, so that the SOC of the power battery can smoothly migrate to the expected value state.

[0094] See also Figure 2 , Figure 2 is a schematic diagram of a control device for charging and discharging power of an auxiliary power battery shown in an exemplary embodiment of the present invention, see Figure 2 The control device 100 for auxiliary power battery charging and discharging power includes:

[0095] The acquisition module 101 is used to acquire multiple remaining capacities of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers; and is also used to acquire the allowable charging power and the allowable discharging power; the allowable charging power and the allowable discharging power are respectively the minimum charging power and the minimum discharging power required by the vehicle model design; and to acquire the maximum remaining capacities limit value allowed for high-power charging of the auxiliary power battery, the minimum remaining capacities limit value allowed for high-power discharging, and the real-time remaining capacities value;

[0096] The power limit module 102 is used to obtain the maximum remaining power limit value allowed for high-power charging and the minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power;

[0097] The remaining power calculation module 103 is used to obtain an expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value;

[0098] The power calculation module 104 is used to obtain the external discharge power and charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value; the real-time remaining power value is the remaining power value of the auxiliary power battery collected in real time;

[0099] The charging and discharging module 105 is used to charge and discharge the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power.

[0100] It should be noted that the auxiliary power battery charging and discharging power control device provided in this embodiment is applicable to scenarios including but not limited to: extended-range hybrid vehicles and other vehicles with auxiliary power batteries.

[0101] It can be understood that the control device for the charging and discharging power of the auxiliary power battery provided in the present embodiment obtains the external discharge power and the charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value, obtains the expected remaining power value according to the maximum remaining power limit and the minimum remaining power limit, and performs charge and discharge operations on the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power; the auxiliary power battery is ensured to be charged and discharged at the appropriate time and with the appropriate power, and the auxiliary power battery is effectively prevented from being in a low SOC or high SOC state for a long time, thereby ensuring the performance of the auxiliary power battery and extending the cycle life of the power battery.

[0102] See also Figure 3 , Figure 3 is a schematic diagram of an electronic device according to an exemplary embodiment of the present invention, see Figure 3 , the electronic device 200 includes: at least one processor 202; and

[0103] A memory 201 is communicatively connected to at least one processor 202; wherein,

[0104] The memory 201 stores instructions that can be executed by at least one processor 202. The instructions are executed by at least one processor 202 so that the at least one processor 202 can execute any of the above-mentioned methods for controlling the charging and discharging power of the auxiliary power battery.

[0105] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0106] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0107] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for controlling the charging and discharging power of an auxiliary power battery of an electric vehicle, characterized in that: The method comprises: Acquire multiple remaining capacities of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers; Obtaining an allowable charging power and an allowable discharging power; the allowable charging power and the allowable discharging power are respectively the minimum charging power and the minimum discharging power required by the vehicle model design; Obtaining a maximum remaining power limit value allowed for high-power charging and a minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power; Obtaining an expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value; The external discharge power and charging power are obtained according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value; the real-time remaining power value is the remaining power value of the auxiliary power battery collected in real time; The auxiliary power battery is charged and discharged according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power.

2. The control method according to claim 1, characterized in that: The obtaining of the expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value includes: The intermediate remaining power value is obtained according to the maximum remaining power limit value and the minimum remaining power limit value. The intermediate remaining power value calculation formula is: SOCIETY mid =(SOC top +SOC bot ) / 2; Among them, SOC mid The intermediate remaining power value; SOC top SOC is the maximum remaining power limit; bot is the minimum remaining power limit; The expected remaining power value is obtained according to the intermediate remaining power value, and the expected remaining power value is calculated by the formula: SOCIETY exp =SOC mid ±δ; Among them, SOC exp is the expected remaining power value, and δ is the expected factor.

3. The control method according to claim 2, characterized in that: The value range of the expected factor is: δ≤20%.

4. The control method according to claim 1, characterized in that: The obtaining of the maximum remaining power limit value allowed for high-power charging and the minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power includes: Obtaining the current battery temperature; Filtering, according to the current battery temperature, from the plurality of first maximum allowable charging powers and first maximum allowable discharging powers to obtain a plurality of second maximum allowable charging powers and second maximum allowable discharging powers; setting the remaining power corresponding to the second maximum allowable charging power equal to the allowable charging power to a maximum remaining power limit; The remaining power corresponding to the second maximum allowable discharge power equal to the allowable discharge power is set as a minimum remaining power limit value.

5. The control method according to claim 1, characterized in that: The obtaining of the external discharge power and the charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value includes: Obtaining the current battery temperature; Obtaining a third maximum allowable charging power and a third maximum allowable discharging power according to the battery temperature and the real-time remaining power value; Obtaining the charging power according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable charging power; The external discharge power is obtained according to the minimum remaining power limit value, the expected remaining power value, the real-time remaining power value and the third maximum allowable discharge power.

6. The control method according to claim 5, characterized in that: The obtaining the charging power according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable charging power includes: The charging power of the auxiliary power battery during vehicle operation is obtained through the cosine power coefficient algorithm. The charging power calculation formula is: P char =cos[(SOC now -SOC exp ) / (SOC exp -SOC bot )×π / 2+π / 2]×P maxchar ; Among them, P char is the charging power; SOC now The real-time remaining power value; SOC exp SOC is the expected remaining power value; bot is the minimum remaining power limit; P maxchar is the third maximum permissible charging power.

7. The control method according to claim 5, characterized in that: The obtaining of the external discharge power according to the minimum remaining power limit, the expected remaining power value, the real-time remaining power value and the third maximum allowable discharge power includes: The external discharge power of the auxiliary power battery during vehicle operation is obtained through the cosine power coefficient algorithm. The external discharge power calculation formula is: P dis =cos[(SOC now -SOC exp ) / (SOC exp -SOC bot )×π / 2+π / 2]×P maxdis ; Among them, P dis is the charging power; SOC now The real-time remaining power value; SOC exp SOC is the expected remaining power value; bot is the minimum remaining power limit; P maxdis It is the third maximum allowable discharge power.

8. The control method according to claim 1, characterized in that: The charging and discharging operation of the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power includes: If the real-time remaining power value is greater than the expected remaining power value, controlling the auxiliary power battery to perform a discharge operation at the external discharge power; If the real-time remaining power value is less than or equal to the expected remaining power value, the auxiliary power battery is charged with the charging power.

9. A control device for charging and discharging power of an auxiliary power battery of an electric vehicle, characterized in that: The device comprises: An acquisition module is used to acquire multiple remaining capacities of the auxiliary power battery at different battery temperatures to obtain multiple first maximum allowable charging powers and first maximum allowable discharging powers; and is also used to acquire allowable charging power and allowable discharging power; the allowable charging power and allowable discharging power are respectively the minimum charging power and the minimum discharging power required by the vehicle model design; A power limit module, used for obtaining a maximum remaining power limit value allowed for high-power charging and a minimum remaining power limit value allowed for high-power discharging of the auxiliary power battery according to the allowed charging power, the allowed discharging power, the first maximum allowed charging power and the first maximum allowed discharging power; A remaining power calculation module, used to obtain an expected remaining power value according to the maximum remaining power limit value and the minimum remaining power limit value; A power calculation module, used to obtain the external discharge power and charging power according to the minimum remaining power limit, the expected remaining power value and the real-time remaining power value; the real-time remaining power value is the remaining power value of the auxiliary power battery collected in real time; The charging and discharging module is used to perform charging and discharging operations on the auxiliary power battery according to the expected remaining power value, the real-time remaining power value, the external discharge power and the charging power.

10. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the control method for the charging and discharging power of the auxiliary power battery as described in any one of claims 1-8.

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