A method and device for matching battery system balancing solutions

Abstract

The present invention provides a method and device for matching a battery system balancing solution, wherein the method includes: obtaining a balancing matching parameter; wherein the balancing matching parameter includes one or more of a battery system parameter, a vehicle parameter, and a battery management system parameter; according to the balancing matching parameter, calculating the current operating state balancing parameter and the non-operating state balancing parameter; according to the operating state balancing parameter and the non-operating state balancing parameter, executing the balancing process of the battery management system. The balancing parameters of the vehicle operating state and the non-operating state are calculated according to the battery system parameters, the vehicle parameters, and the battery management system parameters of the vehicle, and the balancing process of the battery management system is executed according to the balancing parameters. The balancing process of the battery system combines different battery system solutions, different vehicle uses, and different vehicle power consumption, thereby solving the problems of the lack of battery system balancing function, redundant or insufficient balancing function, and improper matching of the vehicle and the battery system in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method and device for matching a battery system balancing solution. Background Art

[0002] In electric vehicles, the battery system is an important component. Since the battery system is composed of multiple cells connected in series and in parallel, as the vehicle is used, the large voltage difference between different cells in the battery system can easily lead to the problem of "incomplete charging of the vehicle". The equalization function of the battery management system can solve some of the problems. However, the existing technology generally has the problems of missing equalization function, redundant or insufficient equalization function, and improper matching of vehicles and battery systems. Summary of the invention

[0003] The object of the present invention is to provide a method and device for matching a battery system balancing solution, which is used to solve the problems in the prior art of missing battery system balancing function, redundant or insufficient balancing function, and improper matching between vehicles and battery systems.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a method for matching a battery system balancing solution, wherein the method includes:

[0005] Acquiring balanced matching parameters; wherein the balanced matching parameters include one or more of battery system parameters, vehicle parameters, and battery management system parameters;

[0006] Calculate the current running state balance parameter and the non-running state balance parameter according to the balance matching parameter;

[0007] The balancing process of the battery management system is performed according to the operating state balancing parameter and the non-operating state balancing parameter.

[0008] Optionally, the method, wherein the performing the equalization process of the battery management system according to the operating state equalization parameter and the non-operating state equalization parameter, includes:

[0009] According to the running state equilibrium parameter and the non-running state equilibrium parameter of the vehicle in the preset period, the running state equilibrium capacity and the non-running state equilibrium capacity of the vehicle in the preset period are calculated;

[0010] Calculate the preset period balanced total capacity according to the running state balanced capacity and the non-running state balanced capacity;

[0011] It is determined whether the difference between the preset period equalization total capacity and the capacity difference value is greater than or equal to a first preset value. If the difference is greater than or equal to the first preset value, the equalization process of the battery management system is executed.

[0012] Optionally, the method further comprises:

[0013] If the difference is less than the first preset value, calculating a first operating state equalization parameter and a first non-operating state equalization parameter according to the equalization matching parameter;

[0014] The balancing process of the battery management system is performed according to the first operating state balancing parameter and the first non-operating state balancing parameter.

[0015] Optionally, in the method, the battery system parameters include one or more of the following:

[0016] Number of cells connected in parallel;

[0017] Nominal capacity of battery cell;

[0018] The self-discharge rate difference of the battery cell during the preset cycle.

[0019] Optionally, in the method, the vehicle parameters include one or more of the following:

[0020] The average running time of the vehicle during the preset cycle;

[0021] Average power consumption of the vehicle during preset cycles;

[0022] Low voltage of the vehicle battery.

[0023] Optionally, in the method, the battery management system parameters include one or more of the following:

[0024] Equalizing resistor;

[0025] Balance battery voltage;

[0026] Equalize channel ratio;

[0027] Balanced duty cycle;

[0028] The power consumption of the battery management system when it is in sleep mode;

[0029] The duration of a single balancing operation when the battery management system is in sleep mode;

[0030] The power consumption of the battery management system when it is working after being awakened from sleep mode;

[0031] How long does the battery management system last after being awakened from sleep mode?

[0032] The power consumption of the battery system's electrical components after the battery management system is awakened from sleep mode.

[0033] Optionally, the method, wherein the calculating, according to the balance matching parameter, the current operating state balance parameter and the non-operating state balance parameter, comprises:

[0034] Calculating the current operating state equilibrium parameter according to the equilibrium matching parameter;

[0035] Calculating the number of non-operating state balancing times in the non-operating state balancing parameter according to the balancing matching parameter and the operating state balancing parameter;

[0036] The non-operating state balancing duty ratio in the non-operating state balancing parameter is calculated according to the balancing matching parameter and the non-operating state balancing number.

[0037] Optionally, in the method, the operating state balancing parameter includes one or more of the following:

[0038] Equalizing resistor;

[0039] Balanced duty cycle in running state;

[0040] Running status balanced channel ratio;

[0041] The average running time of the vehicle during the preset cycle.

[0042] In order to achieve the above object, the present invention provides a device for matching a battery system balancing solution, wherein the device comprises:

[0043] A first acquisition module, used to acquire a balanced matching parameter; wherein the balanced matching parameter includes one or more of a battery system parameter, a vehicle parameter, and a battery management system parameter;

[0044] A first calculation module, used for calculating the current running state balance parameter and the non-running state balance parameter according to the balance matching parameter;

[0045] The first execution module is used to execute the equalization process of the battery management system according to the operating state equalization parameter and the non-operating state equalization parameter.

[0046] The beneficial effects of the above technical solution of the present invention are as follows:

[0047] In the above scheme, the balancing parameters of the vehicle's operating state and non-operating state are calculated based on the vehicle's battery system parameters, vehicle parameters and battery management system parameters, and the balancing process of the battery management system is executed based on the balancing parameters. The balancing process of the battery system combines different battery system schemes, different vehicle uses, and different vehicle power consumption, thereby solving the problems of missing battery system balancing function, redundant or insufficient balancing function, and improper matching of vehicles and battery systems in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 One of the flow charts of the method for matching a battery system balancing solution according to an embodiment of the present invention;

[0049] Figure 2 This is a second flowchart of the method for matching a battery system balancing solution according to an embodiment of the present invention;

[0050] Figure 3 A structural diagram of a device for matching a battery system balancing solution according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The present invention aims to solve the problems in the prior art of missing balancing function of the battery system, redundant or insufficient balancing function, and improper matching between the vehicle and the battery system, and provides a method and device for matching a battery system balancing solution.

[0053] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a method for matching a battery system balancing solution, wherein the method includes:

[0054] S1, obtaining a balanced matching parameter; wherein the balanced matching parameter includes one or more of a battery system parameter, a vehicle parameter, and a battery management system parameter;

[0055] S2, calculating the current running state balance parameter and the non-running state balance parameter according to the balance matching parameter;

[0056] S3, executing a balancing process of the battery management system according to the operating state balancing parameter and the non-operating state balancing parameter.

[0057] In this embodiment, the balancing parameters of the vehicle's operating state and non-operating state are calculated based on the vehicle's battery system parameters, vehicle parameters and battery management system parameters, and the balancing process of the battery management system is executed based on the balancing parameters. The balancing process of the battery system combines different battery system solutions, different vehicle uses, and different vehicle power consumption, thereby solving the problems of missing battery system balancing function, redundant or insufficient balancing function, and improper matching of vehicles and battery systems in the prior art.

[0058] Optionally, the method, wherein the performing the equalization process of the battery management system according to the operating state equalization parameter and the non-operating state equalization parameter, includes:

[0059] According to the running state equilibrium parameter and the non-running state equilibrium parameter of the vehicle in the preset period, the running state equilibrium capacity and the non-running state equilibrium capacity of the vehicle in the preset period are calculated;

[0060] Calculate the preset period balanced total capacity according to the running state balanced capacity and the non-running state balanced capacity;

[0061] It is determined whether the difference between the preset period equalization total capacity and the capacity difference value is greater than or equal to a first preset value. If the difference is greater than or equal to the first preset value, the equalization process of the battery management system is executed.

[0062] In this embodiment, the preset period equalization total capacity is the sum of the operating state equalization capacity and the non-operating state equalization capacity. When the difference between the preset period equalization total capacity and the capacitance difference value is greater than or equal to the first preset value, that is, the preset period equalization total capacity is greater than or equal to the capacitance difference value, the equalization process can reduce the problem of pressure difference caused by self-discharge difference between battery cells in the battery system, wherein the preset period equalization total capacity is calculated based on one or more of the battery system parameters, the vehicle parameters and the battery management system parameters. Different equalization schemes can be formulated in combination with different battery system schemes, different electric vehicle uses, and different vehicle power consumption requirements.

[0063] Optionally, the method further comprises:

[0064] If the difference is less than the first preset value, calculating a first operating state equalization parameter and a first non-operating state equalization parameter according to the equalization matching parameter;

[0065] The balancing process of the battery management system is performed according to the first operating state balancing parameter and the first non-operating state balancing parameter.

[0066] In this embodiment, when the difference between the preset period equalization total capacity and the capacitance difference value is less than the first preset value, that is, the preset period equalization total capacity is less than the capacitance difference value, the equalization parameters of the operating state and the non-operating state are re-adjusted according to one or more of the current battery system parameters, the vehicle parameters and the battery management system parameters, and the equalization process of the battery management system is executed according to the updated equalization parameters.

[0067] Optionally, in the method, the battery system parameters include one or more of the following:

[0068] Number of cells connected in parallel;

[0069] Nominal capacity of battery cell;

[0070] The self-discharge rate difference of the battery cell during the preset cycle.

[0071] In this embodiment, the preset period balanced total capacity is calculated by multiplying the product of the number of battery cells in parallel, the nominal capacity of the battery cells and the self-discharge difference rate of the battery cells in the preset period by the preset period length, and the preset period balanced total capacity is calculated by the battery system parameters. Combining the balancing process with the battery system parameters can reduce the power consumption of the entire vehicle while reducing the voltage difference caused by the self-discharge difference of the battery cells.

[0072] Optionally, in the method, the vehicle parameters include one or more of the following:

[0073] The average running time of the vehicle during the preset cycle;

[0074] Average power consumption of the vehicle during preset cycles;

[0075] Low voltage of the vehicle battery.

[0076] Optionally, in the method, the battery management system parameters include one or more of the following:

[0077] Equalizing resistor;

[0078] Balance battery voltage;

[0079] Equalize channel ratio;

[0080] Balanced duty cycle;

[0081] The power consumption of the battery management system when it is in sleep mode;

[0082] The duration of a single balancing operation when the battery management system is in sleep mode;

[0083] The power consumption of the battery management system when it is working after being awakened from sleep mode;

[0084] How long does the battery management system last after being awakened from sleep mode?

[0085] The power consumption of the battery system's electrical components after the battery management system is awakened from sleep mode.

[0086] In this embodiment, the average operating time of a preset period is estimated according to different types of vehicles. For example, the operating time of a private car is shorter than that of a taxi. The average operating time of the vehicle in the preset period includes the driving and charging time. The low-battery voltage of the vehicle battery in the embodiment of the present invention is the low-battery voltage of a lead-acid 12V battery. The balancing channel ratio is the ratio of balancing channels that can be opened simultaneously by the battery management system to the total channels. The balancing duty cycle is the ratio of the passage time to the total time for a unified balancing channel.

[0087] It should be noted that the balancing circuit in the embodiment of the present invention can be simply equivalent to a balancing circuit connected in parallel on a battery cell, which includes a switch and a balancing resistor connected in series, and the battery management system controls the on and off of the balancing circuit to discharge the battery cell.

[0088] Optionally, the method, wherein the calculating, according to the balance matching parameter, the current operating state balance parameter and the non-operating state balance parameter, comprises:

[0089] Calculating the current operating state equilibrium parameter according to the equilibrium matching parameter;

[0090] Calculating the number of non-operating state balancing times in the non-operating state balancing parameter according to the balancing matching parameter and the operating state balancing parameter;

[0091] The non-operating state balancing duty ratio in the non-operating state balancing parameter is calculated according to the balancing matching parameter and the non-operating state balancing number.

[0092] Optionally, in the method, the operating state balancing parameter includes one or more of the following:

[0093] Equalizing resistor;

[0094] Balanced duty cycle in running state;

[0095] Running status balanced channel ratio;

[0096] The average running time of the vehicle during the preset cycle.

[0097] In this embodiment, the average running time of the vehicle in the preset cycle is estimated according to the type of the vehicle, and the following calculation is performed:

[0098] Q1=U / R×μ1×η1×T1

[0099] Among them, Q1 is the balancing capacity in the running state, U is the balancing battery voltage, R is the balancing resistance, μ1 is the balancing channel ratio in the running state, η1 is the balancing duty cycle in the running state, and T1 is the average running time of the vehicle preset cycle.

[0100] Q2=Q-Q2

[0101] Among them, Q2 is the balancing capacity in the non-operating state, and Q is the total balancing capacity in the preset period.

[0102] P=[P1×(T-t2×N)+(P2+P3)×t2×N] / T

[0103] Among them, P is the average power consumption of the vehicle in a preset period, P1 is the power consumption of the battery management system when it is in sleep mode, T is the preset period duration, t2 is the working duration of the battery management system after being awakened from sleep mode, N is the number of non-operating state balancing times, P2 is the power consumption of the battery management system when it is working after being awakened from sleep mode, and P3 is the power consumption of the electrical components of the battery system after the battery management system is awakened from sleep mode. The non-operating state balancing times N are obtained from this formula.

[0104] Q2=U / R×μ2×η2×t1×N

[0105] Wherein, μ2 is the balancing channel ratio in the non-operating state, η2 is the balancing duty cycle in the non-operating state, and t1 is the single balancing duration when the battery management system is dormant.

[0106] It should be noted that in the embodiment of the present invention, when it is detected that the voltage of the battery system is lower than the low-battery voltage of the vehicle battery, balancing will be prohibited. Under the requirement of not exceeding the temperature rise of the battery management system, the higher the balancing channel ratio, the better.

[0107] like Figure 3 As shown, in order to achieve the above-mentioned purpose, the present invention provides a device for matching a battery system balancing solution, wherein the device comprises:

[0108] A first acquisition module 21 is used to acquire a balanced matching parameter; wherein the balanced matching parameter includes one or more of a battery system parameter, a vehicle parameter and a battery management system parameter;

[0109] A first calculation module 22, used for calculating the current running state balance parameter and the non-running state balance parameter according to the balance matching parameter;

[0110] The first execution module 23 is used to execute the equalization process of the battery management system according to the operating state equalization parameter and the non-operating state equalization parameter.

[0111] Optionally, in the device, the first execution module 23 includes:

[0112] A first calculation unit, configured to calculate the running state equilibrium capacity and the non-running state equilibrium capacity of the vehicle within the preset period according to the running state equilibrium parameter and the non-running state equilibrium parameter of the vehicle within the preset period;

[0113] A second calculation unit, configured to calculate a preset period balanced total capacity according to the running state balanced capacity and the non-running state balanced capacity;

[0114] The first judgment unit is used to judge whether the difference between the preset period equalization total capacity and the capacity difference value is greater than or equal to a first preset value, and if the difference is greater than or equal to the first preset value, execute the equalization process of the battery management system.

[0115] Optionally, the device further comprises:

[0116] A first processing module, configured to calculate a first operating state equalization parameter and a first non-operating state equalization parameter according to the equalization matching parameter if the difference is less than the first preset value;

[0117] The second execution module is used to execute the balancing process of the battery management system according to the first operating state balancing parameter and the first non-operating state balancing parameter.

[0118] Optionally, in the device, the battery system parameters include one or more of the following:

[0119] Number of cells connected in parallel;

[0120] Nominal capacity of battery cell;

[0121] The self-discharge rate difference of the battery cell during the preset cycle.

[0122] Optionally, in the device, the vehicle parameters include one or more of the following:

[0123] The average running time of the vehicle during the preset cycle;

[0124] Average power consumption of the vehicle during preset cycles;

[0125] Low voltage of the vehicle battery.

[0126] Optionally, in the device, the battery management system parameters include one or more of the following:

[0127] Equalizing resistor;

[0128] Balance battery voltage;

[0129] Equalize channel ratio;

[0130] Balanced duty cycle;

[0131] The power consumption of the battery management system when it is in sleep mode;

[0132] The duration of a single balancing operation when the battery management system is in sleep mode;

[0133] The power consumption of the battery management system when it is working after being awakened from sleep mode;

[0134] How long does the battery management system last after being awakened from sleep mode?

[0135] The power consumption of the battery system's electrical components after the battery management system is awakened from sleep mode.

[0136] Optionally, in the device, the first calculation module 22 includes:

[0137] A third calculation unit, configured to calculate the current operating state balance parameter according to the balance matching parameter;

[0138] A fourth calculation unit, configured to calculate the number of non-operating state balancing times in the non-operating state balancing parameter according to the balancing matching parameter and the operating state balancing parameter;

[0139] The fifth calculation unit is used to calculate the non-operating state balancing duty ratio in the non-operating state balancing parameter according to the balancing matching parameter and the non-operating state balancing number.

[0140] Optionally, in the device, the operating state balance parameter includes one or more of the following:

[0141] Equalizing resistor;

[0142] Operation state balanced duty cycle;

[0143] Running status balanced channel ratio;

[0144] The average running time of the vehicle during the preset cycle.

[0145] In this embodiment, a balancing scheme is formulated based on the vehicle type by estimating the vehicle's operating time through big data analysis. The balancing scheme is divided into operating balancing and non-operating balancing according to the vehicle's operating status. In the non-operating balancing scheme, the battery management system sets a sleep and periodic wake-up mechanism. The battery management system periodically wakes up the main board of the battery management system for detection, and then the main board sleeps and the slave board performs balancing. Combined with the average power consumption of the vehicle in the preset cycle, the number of non-operating state balancing times is calculated, and combined with the operating parameters of the vehicle, the balancing duty cycle of the operating state and the non-operating state is matched and designed. It can solve the problems of the lack of battery system balancing function, redundant or insufficient balancing function, and improper matching of vehicles and battery systems in the prior art.

[0146] It should be noted here that the above-mentioned device provided in the embodiment of the present invention can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as the method embodiment in this embodiment will not be described in detail here.

[0147] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for matching a battery system balancing solution, characterized in that: The method comprises: Acquiring balanced matching parameters; wherein the balanced matching parameters include one or more of battery system parameters, vehicle parameters, and battery management system parameters; Calculate the current running state balance parameter and the non-running state balance parameter according to the balance matching parameter; Executing a balancing process of a battery management system according to the operating state balancing parameter and the non-operating state balancing parameter; The step of calculating the current operating state balancing parameters and non-operating state balancing parameters according to the balancing matching parameters includes: Calculating the current operating state equilibrium parameter according to the equilibrium matching parameter; Calculating the number of non-operating state balancing times in the non-operating state balancing parameter according to the balancing matching parameter and the operating state balancing parameter; Calculating a non-operating state balancing duty ratio in a non-operating state balancing parameter according to the balancing matching parameter and the non-operating state balancing number; The performing of the equalization process of the battery management system according to the operating state equalization parameter and the non-operating state equalization parameter comprises: According to the running state equilibrium parameter and the non-running state equilibrium parameter of the vehicle in the preset period, the running state equilibrium capacity and the non-running state equilibrium capacity of the vehicle in the preset period are calculated; Calculate the preset period balanced total capacity according to the running state balanced capacity and the non-running state balanced capacity; Determine whether the difference between the preset period equalization total capacity and the capacity difference value is greater than or equal to a first preset value, and if the difference is greater than or equal to the first preset value, execute the equalization process of the battery management system; If the difference is less than the first preset value, calculating a first operating state equalization parameter and a first non-operating state equalization parameter according to the equalization matching parameter; The balancing process of the battery management system is performed according to the first operating state balancing parameter and the first non-operating state balancing parameter.

2. The method according to claim 1, characterized in that The battery system parameters include one or more of the following: Number of cells connected in parallel; Nominal capacity of battery cell; The self-discharge rate of the battery cell during the preset cycle.

3. The method according to claim 1, characterized in that The vehicle parameters include one or more of the following: The average running time of the vehicle during the preset cycle; Average power consumption of the vehicle during preset cycles; Low voltage of the vehicle battery.

4. The method according to claim 1, characterized in that: The battery management system parameters include one or more of the following: Equalizing resistor; Balance battery voltage; Equalize channel ratio; Balanced duty cycle; The power consumption of the battery management system when it is in sleep mode; The duration of a single balancing operation when the battery management system is in sleep mode; The power consumption of the battery management system when it is working after being awakened from sleep mode; How long does the battery management system last after being awakened from sleep mode? The power consumption of the battery system's electrical components after the battery management system is awakened from sleep mode.

5. The method according to claim 1, characterized in that The operating state balance parameters include one or more of the following: Equalizing resistor; Operation state balanced duty cycle; Running status balanced channel ratio; The average running time of the vehicle during the preset cycle.

6. A device for matching a battery system balancing solution, characterized in that: The device comprises: A first acquisition module, used to acquire a balanced matching parameter; wherein the balanced matching parameter includes one or more of a battery system parameter, a vehicle parameter, and a battery management system parameter; A first calculation module, used for calculating the current running state balance parameter and the non-running state balance parameter according to the balance matching parameter; A first execution module, configured to execute a balancing process of a battery management system according to the operating state balancing parameter and the non-operating state balancing parameter; Wherein, the first calculation module includes: A third calculation unit, configured to calculate the current operating state balance parameter according to the balance matching parameter; A fourth calculation unit, configured to calculate the number of non-operating state balancing times in the non-operating state balancing parameter according to the balancing matching parameter and the operating state balancing parameter; A fifth calculation unit, configured to calculate a non-operating state balancing duty ratio in a non-operating state balancing parameter according to the balancing matching parameter and the non-operating state balancing number; The first execution module includes: A first calculation unit, configured to calculate the running state equilibrium capacity and the non-running state equilibrium capacity of the vehicle within the preset period according to the running state equilibrium parameter and the non-running state equilibrium parameter of the vehicle within the preset period; A second calculation unit, configured to calculate a preset period balanced total capacity according to the running state balanced capacity and the non-running state balanced capacity; A first judgment unit, used to judge whether the difference between the equalized total capacity of the preset period and the capacity difference value is greater than or equal to a first preset value, and if the difference is greater than or equal to the first preset value, execute the equalization process of the battery management system; A first processing module, configured to calculate a first operating state equalization parameter and a first non-operating state equalization parameter according to the equalization matching parameter if the difference is less than the first preset value; The second execution module is used to execute the balancing process of the battery management system according to the first operating state balancing parameter and the first non-operating state balancing parameter.

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