[0027] The invention will be described in detail below with reference to the specific embodiments and the accompanying drawings. It is intended to exhibit the specific embodiments of the invention in detail, and there is no limit to the present invention, and the scope of the invention is subject to the claims.
[0028] Refer figure 1 The present invention proposes a battery equilibrium strategy of a mixing system, including:
[0029] Step S001, when the voltage difference between the highest power electrical cells and the minimum amount of power cells in the battery pack is greater than the preset voltage difference, it is further determined whether the remaining power amount of the highest power battery is greater than the preset remaining power;
[0030] Step S002, if the remaining power of the highest power battery is greater than the preset residual amount, the battery equalization operation begins, during battery balancing operation, the mixing system determines the motor to perform power consumption or power generation, power consumption, and electricity, and power consumption, and Power generation action corresponds to battery pack discharge and charging;
[0031] Step S003, if the equalization end condition is reached, the battery equalization operation ends.
[0032] Since there is a difference between the different cells in the battery, there is a need to perform an equalization of power between the different batteries when used, so that the life of the overall battery is extended.
[0033] In the prior art, when the battery in the battery pack is less than 30%, the power is prohibited, and the SOC (S Tate of Charge) of the battery is not checked if the balance is started. The preset value is completed in this balanced task once it begins.
[0034] If the mixing system uses a battery equilibrium strategy for pure electric vehicles, it is often not possible to meet the battery equilibrium conditions, causing the battery to be equalized.
[0035] For a mixing system, the battery pack needs to keep the state of the brake energy recovery and the power output, so that the power is often in an dissatisfaction state. When the electrical cell is unbalanced, the lowest electrical core has a low power, and there is no common working condition to continuously charge the battery (which can charge the mixed battery to high power), which is only continuous downhill), resulting in equalization The prerequisite for minimal power cannot be met. So the battery pack does not turn on the balance in time, resulting in the difference in power differences in the battery.
[0036] Therefore, the present embodiment proposes a new hybrid system battery equilibrium strategy.
[0037] In step S001, when the voltage difference between the highest power cell and the lowest power battery cells within the battery pack is greater than the preset voltage difference, it is further determined whether the remaining battery amount of the highest power battery is greater than the preset remaining electricity.
[0038] If the voltage difference between the highest power cell and the lowest power cell in the battery pack is greater than the preset voltage difference, it is considered necessary to make a balance of the battery, such as 15 mV, and the preset remaining electricity is, for example, full power. 18% of the value. The purpose of setting the preset remaining electricity is to prevent the power of the maximum battery cell from being over.
[0039] In step S002, if the remaining power of the highest power battery is larger than the preset remaining battery quantity, the battery equalization operation begins, during the battery equilibrium operation, the mixing system determines the power consumption or power generation operation according to the voltage of the battery pack. Action and power generation actions correspond to battery pack discharge and charging;
[0040] As long as the remaining power of the highest power battery is greater than the preset remaining battery, the power equalization can be performed, since the motor in the hybrid system provides voltage guarantees, so the battery pack does not increase due to equalization, thereby greatly increase the balance The scene, and when the motor does not generate electricity, the battery equilibrium stops to prevent the battery loss from deteriorating.
[0041] Alternatively, when the motor is powered by the battery pack, the power supply mode is different from the battery pack voltage value.
[0042] In step S003, if a balance end condition is reached, the battery equalization operation ends. The equalization end condition is, for example, the voltage difference between the highest power supply and the lowest power battery cell, is smaller than the preset equalization pressure difference.
[0043] The present embodiment solves the technical problem of the mixing system in the prior art that the battery is unable to perform battery equilibrium, and the battery equilibrium strategy of the mixing system provided in this embodiment is greatly added to increase the battery equilibrium scene of the mixing system, so that the battery balance can be sufficient. Perform, increase the battery life, so that the production consistency requirements of the battery cells in the hybrid system are significantly reduced, making the mild foreign body cells can also be used normally, saving production costs.
[0044] In one embodiment, when the battery balance operation starts, the battery pack is transmitted to the control unit, and after the control unit receives the equalization signal, the battery pack voltage value is monitored in real time. If the battery pack voltage value is greater than or equal to the preset voltage value, The control unit emits a torque control mode instruction to the motor, otherwise the constant voltage power mode command and the constant voltage target value are issued.
[0045] When the battery pack voltage value is greater than or equal to the preset voltage value, the control unit emits a torque control mode instruction to the motor. At this time, the mixing system is normal, and the battery pack is normal to charge and discharge, the motor performs a torque control mode. When the battery pack is in the package, discharge is mainly performed by a high power battery. At the same time, when the battery pack is charged, the low-voltage battery cell is prioritized due to the cause of the pressure difference. When the voltage difference between the highest power battery and the lowest power cell is smaller than the preset equalization pressure difference, the battery balance operation ends, otherwise it will continue to determine if the battery packet voltage value is greater than or equal to the preset voltage value.
[0046] Alternatively, the battery pack is a lithium battery pack.
[0047] When the battery pack voltage value is less than the preset voltage value, the control unit emits a constant voltage power generation mode command and constant voltage target value such as 45.7V, a mixing system function, and the lithium battery is disabled. The motor is output by the constant voltage target value of 45.7V, and all the electrical cells simultaneously correspond to the constant voltage target value. When the battery is higher than the target value, the high-exhausted self-discharge is performed; when the battery When the amount of power is lower than the target value, it is quickly charged; when the voltage difference between the highest power battery and the lowest battery cell is smaller than the preset equalization voltage difference, the battery balance operation ends, otherwise it will continue to determine if the battery pack voltage value is greater than or equal to equal Preset voltage value.
[0048] The equalization end condition is that the voltage difference between the highest power battery and the lowest power cell is smaller than the preset equalization pressure difference, such as 5 mV.
[0049] Figure 4 - Figure 6 The curve in the upper upper curve is the curve of the highest power supply, the following curve is the curve of the lowest power battery.
[0050] like Figure 4 As shown in one embodiment, after the motor receives the torque control mode instruction, the torque control mode is performed. When the battery pack is discharged, the highest power battery cell in the battery pack performs high power discharge, the lowest power supply battery low power. Discharge, when the battery pack is charged, the lowest battery cell is prioritized. If the voltage difference between the highest power battery and the lowest power battery cell is smaller than the preset equalization pressure difference, the battery balance action is ended, otherwise, continues to determine the battery pack. Whether the voltage value is greater than or equal to the preset voltage value.
[0051] After the motor receives the torque control mode instruction, the torque control mode is performed, and when the battery pack needs to be discharged, the discharge is mainly performed by the highest power battery, and the lowest power battery is maintained at a minimum discharge. When the voltage difference between the highest power battery and the lowest power cell is smaller than the preset equalization pressure difference, the battery equalization operation is ended.
[0052] like Figure 5 As shown in one embodiment, if it is determined that the battery packet voltage value is less than the preset voltage value, the control unit emits a constant voltage power generation mode command and constant voltage target value to the motor, and the motor is switched by the torque control mode to constant voltage power generation. Mode, otherwise the motor continues to perform torque control mode. Constant voltage target values such as 45.7V.
[0053] In the torque control mode, the battery pack can be discharged or charged. When the motor outputs torque, when the power accelerates, the battery pack is a discharge state, but when the motor does not output torque, the battery pack is a charging state, when the battery pack is in When discharged, discharge is performed by the highest power battery in the battery pack, and the minimum amount of power is maintained at a minimum discharge. However, when the voltage difference between the highest power battery and the lowest battery cell is still greater than the preset equalization pressure difference, when the battery packet voltage value is less than the preset voltage value, the control unit issues a constant voltage power generation mode to the motor. Instructions and voltage target values, the motor is switched from the torque control mode to a constant voltage power generation mode. After the motor is switched to the constant voltage power generation mode, the motor is constant according to the voltage target value, maintains the voltage of the power supply network constant, and disables the lithium battery pack to discharge the external discharge, all the battery core simultaneously corresponds to the constant voltage target value, the electricity value is approximated, the battery When higher than the target value, perform high-exhaustive self-discharge; when the battery is lower than the target value, it is quickly charged. Finally, the voltage between the cells tends to balance. The voltage difference between the highest power battery and the lowest power cell is smaller than the preset equalization pressure difference, and end the battery equilibrium action.
[0054] In the torque control mode, if it is determined that the battery packet voltage value is less than the preset voltage value, the control unit issues a constant voltage power mode command and the voltage target value to the motor, and the motor is switched by the torque control mode to a constant voltage power generation mode, that is, once detected The battery pack voltage value is low, and the battery pack is prohibited from discharge, and the motor is switched to constant voltage mode.
[0055] For example, the maximum amount of electric battery is 30%, the lowest power battery is 10%, and when the highest power battery is dissipated by 5%, the battery pack voltage is lower than the set value, at which time the motor will switch from the torque control mode to constant Press-power mode, the motor of the hybrid system will maintain a constant power voltage of 45.7V, so that the maximum battery capacity and the lowest battery power are close to a target value, such as approaching 25%, 45.7V power generation voltage to the battery cell After filled with 25%, the charge is no longer charged, 25% is not a set value, but the size of the target voltage value determines the charging value. The final maximum battery cell will dissipate the self-discharge 5%, the power is 25%; the minimum battery cell is charged 15%, the same power reaches 25%, thereby achieving equalization, and the actuation is not limited by the battery. During the equilibrium process, avoid the battery's power drop, thereby significantly increase the battery balance scenario to improve the battery life.
[0056] In one embodiment thereof, in the torque control mode, the hybrid system is normal, and the battery pack is normal charging and discharging. In the torque control mode, since the battery pack voltage value is high, the mixing system can operate normally, the lithium battery package is discharged, and the dissipation type discharge is performed by the high power battery, and the lithium battery pack full package is due to pressure differential. The reason, give priority to the low battery cell, charge the low battery cell.
[0057] In one embodiment, the motor receives the constant voltage power mode command and the constant voltage target value, performs the constant voltage power generation mode, the motor output constant voltage target value, and the power amount of all the batteries in the battery pack correspond to the constant voltage target value. The target power value is approximated. If the battery is higher than the target power value, the high-exhaustive self-discharge is performed. When the amount of power is lower than the power target value, it is quickly charged. If the highest power battery cell is lowered The voltage difference between the power cell is smaller than the preset equalization pressure difference, and the battery balance operation ends, otherwise it will continue to determine if the battery packet voltage value is greater than or equal to the preset voltage value. The constant voltage target value is, for example, 45.7V.
[0058] like Image 6 As shown, after the motor receives the constant voltage power mode command and the voltage target value, performs a constant voltage power generation mode, at which time the maximum amount of electric battery is equal to the power supply amount of the target voltage, so the maximum power battery is constant, while The minimum battery cell is charged quickly, and the power is lifted. Then the voltage difference between the highest power battery and the lowest power cell is smaller than the preset equalization pressure difference, and end the battery equilibrium action.
[0059] In constant voltage power generation mode, the hybrid system function is limited, and the mixing system prohibits power consumption function such as motor driving, power supply, and prohibits lithium battery summation to externally, and provides constant voltage power supply environment, which is advantageous for various battery packs The battery is fast and smooth to achieve a balanced target.
[0060] like Figure 7 As shown, the cause of the constant voltage target value is 45.7 V: When the battery pack voltage is greater than x or less y, the SOC of the battery pack is determined by the non-platform area, which has higher precision, X, Y is determined by the material characteristics of the lithium battery. . When the battery is completely no time voltage is z, because low pressure charging can avoid the battery overcharge, there is a risk of fire, smoke, so it takes less than y, greater than z, within this range, can ensure the lowest battery Electricity, while SOC is in a high precision area, and can avoid the risk of fire, smoke, etc.
[0061] In one embodiment, if it is judged that the battery pack voltage value is greater than or equal to the preset voltage value, the control unit emits a torque control mode command to the motor, and the motor is switched from the constant voltage power mode to a torque control mode, otherwise the motor continues to perform constant voltage. Power generation mode. When the battery pack voltage value changes, the motor can also switch from the constant voltage power generation mode to the torque mode of operation. The hybrid system is restored to normal operation by mode switching.
[0062] In one embodiment thereof, in the constant voltage power generation mode, the hybrid system function is limited, and the battery pack can only be charged, and the external discharge is prohibited. In order to ensure the completion of the balance, in constant voltage power generation mode, the hybrid system function is limited, and the battery pack can only be charged, and the external discharge is prohibited.
[0063] In one embodiment thereof, the equalization end condition is less than the voltage difference between the highest power electrical core and the minimum amount of battery cells.
[0064] In this embodiment, it is judged whether or not the voltage difference between the highest amount of electricity battery and the lowest power battery cell is smaller than the preset equalization pressure difference, and if it is smaller, the balance of this battery is ended. If it is not reached, it will continue to cycle judgment.
[0065] Refer figure 2 The present invention proposes a battery equilibrium strategy of a mixing system, including:
[0066] Step S201: Monitor the battery SOC within the battery pack;
[0067] Step S202, determining whether the voltage difference between the highest power electrical cells in the battery pack and the lowest power battery cell is greater than the preset voltage difference, the preset voltage difference A is, for example, 15 mV, if, then continue, if, end;
[0068] Step S203, determining whether the remaining power of the highest power battery is greater than the preset residual power B, the preset remaining electricity amount is, for example, 18% of the full-power value, if, then continue, if, end;
[0069] Step S204, the dynamic equalization of the battery pack begins, namely the battery balance begins;
[0070] Step S205, the battery pack sends a balanced signal to the control unit;
[0071] Step S206, after the control unit receives the equalization signal, monitor the battery pack voltage value in real time;
[0072] In step S207, it is determined whether the battery packet voltage value is greater than or equal to the preset voltage value C C, for example, 45.3V, if it is greater than or equal, then transfer to S208, if less than, then transfer S210;
[0073] Step S208, the control unit issues a torque control mode command to the motor;
[0074] Step S209, in the torque control mode, the mixing system is normal, the battery pack is normally charged and discharged. When the lithium battery pack is discharged, the dissipative discharge is performed by the high power battery, and when the lithium battery package is charged, Then, due to the causes of differential pressure, the low-voltage battery cell is preferentially replenished, and the low battery cell is charged; the process proceeds to step S212;
[0075] Step S210, the control unit issues a constant voltage power mode command and constant voltage target value to the motor;
[0076] In step S211, in the constant voltage power generation mode, the mixing system function is limited, and the battery pack can only be charged, prohibiting external discharge, with a 45.7V value of output target, and all the cells simultaneously correspond to the corresponding amount of electricity, such as 25% approach. When the battery is higher than 25%, the high-exhaustive discharge is performed, and when the battery is lowered below the target value, it is quickly charged, and the process proceeds to step S212;
[0077] In step S212, it is determined whether the voltage difference between the highest power supply cell and the minimum amount of battery cell is smaller than the preset equalization voltage difference. If yes, the battery equalization is ended, and the step S213 is turned into step S213. If, returns to step S207;
[0078] Step S213, the dynamic equalization ends.
[0079] The present invention also proposes a mixed vehicle characterized in that the battery equilibrium strategy of the mixing system according to any of the above is employed.
[0080] The present embodiment solves the technical problem of the mixing system in the prior art that the battery is unable to perform battery equilibrium, and the battery equilibrium strategy of the mixing system provided in this embodiment is greatly added to increase the battery equilibrium scene of the mixing system, so that the battery balance can be sufficient.Perform, improve the battery life.Thus, the production consistency requirements of the battery cells in the hybrid system are significantly reduced, so that the mild foreign body cell can be used normally, saving production costs.
[0081] The above is merely the principles and preferred embodiments of the present invention.It should be noted that a number of other modifications can also be made based on the principles of the invention, and may also be considered as the scope of the invention.
