CN115635880A - Discharging power control method and system of power battery and electric automobile - Google Patents
Discharging power control method and system of power battery and electric automobile Download PDFInfo
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Abstract
The invention discloses a discharge power control method and system of a power battery and an electric vehicle, wherein the discharge power is limited in a grading manner according to the undervoltage stage number, the discharge power is automatically adjusted according to the undervoltage triggering frequency (frequency), the closed-loop control of the discharge power (self-adaptive limitation of the discharge power) can be realized, the use of different working conditions by a customer can be automatically adapted, the frequent fluctuation of the power of the discharge end of the power battery can be effectively limited even under the limited use working condition, the running smoothness is ensured, the problem of poor driving experience of the customer due to the frequent fluctuation of the power is avoided, the maximum discharge capacity of the power battery at a low temperature is ensured, the power performance of the discharge end of the power battery is improved, the problem of poor user experience is solved, and the safety risk caused by sudden power interruption can be avoided.
Description
Technical Field
The invention belongs to the field of power battery control, and particularly relates to a discharge power control method and system of a power battery and an electric vehicle.
Background
The power battery is used as a main energy storage element in the electric automobile, and the problems of poor power performance and smoothness at the low-temperature low-SOC discharge end, power interruption and the like are always the pain points of customers in use. With the development of the battery cell technology, the capacity of a battery cell is increased, the power performance of the battery cell is increased, and most of the discharge power of the power battery in a normal SOC (state of charge) use interval can meet the use requirements of customers; however, when the temperature and the SOC of the power battery are reduced at a low temperature and at a low SOC, the discharging power of the power battery is lower than the electric driving demand capacity, and when the discharging end power of the power battery is not matched with the capacity of the power battery, power fluctuation and power interruption are easily caused, and the problems of poor user experience and safety risk are brought.
The discharge power of the power battery under the low-temperature condition can cause large-amplitude attenuation of the power, and the attenuated power value is more obvious when the power battery is low in electricity, so that how to control the discharge power of the power battery is to effectively limit the frequent fluctuation of the power at the discharge end of the power battery, and ensure the smoothness of operation is a problem to be solved urgently.
CN110065394A discloses a power battery monomer under-voltage protection method and system, which acquires the monomer voltage of a power battery and calculates the lowest monomer voltage, judges whether the lowest monomer voltage is lower than a first preset voltage value within a first preset time, if so, judges that the power battery has a serious under-voltage fault, disconnects the charging and discharging of the power battery, performs under-voltage protection on the power battery, if not, judges whether the lowest monomer voltage is lower than a second preset voltage value within a second preset time, if so, reduces the original charging and discharging power, allows the discharging although the monomer voltage ratio is smaller, and prevents the battery car from stopping. Although it can avoid power interruption, it cannot solve the problem of frequent power fluctuation at the discharge end of the power battery.
Disclosure of Invention
The invention aims to provide a discharge power control method and system of a power battery and an electric automobile, so as to effectively limit frequent power fluctuation of a discharge tail end of the power battery and ensure running smoothness.
The invention discloses a discharge power control method of a power battery, which comprises the following steps:
monitoring the lowest monomer temperature T of the current power battery in real time min Minimum cell voltage U min And an SOC value.
According to the lowest unit temperature T of the current power battery min Minimum cell voltage U min And (4) judging: if the undervoltage is not triggered, the discharge power of the power battery is made to be P; if I-stage undervoltage is triggered, the discharge power of the power battery is set to be A i * P; and if the n-stage undervoltage is triggered, the discharge power of the power battery is 0. Wherein, P represents the lowest single temperature T according to the current power battery min The SOC value inquires a preset discharge power meter to obtain a lookup discharge power, n represents a preset total undervoltage stage number, n is an odd number, n is not less than 3,i is an integer, i is not less than 1 and not more than n-1,A i Representing the i-class under-voltage limit power coefficient, A i Is equal to E i ，E i Representing a preset i-level undervoltage limit power coefficient threshold, the larger i is, E i The smaller the value of (c).
And recording the triggered undervoltage level and the triggering frequency, and judging whether the power recovery condition corresponding to the undervoltage level is met. When the power recovery condition corresponding to the 2j-1 stage undervoltage is met, the discharge power of the power battery is H j * P, let A 2j-1 ＝min(E 2j-1 ，H j ). When the power recovery condition corresponding to the 2 j-level undervoltage is met, the discharge power of the power battery is made to be H j * P, let A 2j ＝min(E 2j ，H j ). Wherein A is 2j-1 Represents the 2j-1 class under-voltage limit power coefficient, A 2j Represents the 2 j-level undervoltage limit power coefficient, H j Represents the power recovery coefficient corresponding to the 2j-1 class undervoltage and the 2j class undervoltage, H j ＝max(B tj ，D j )，B tj ＝C j *B t-1 ，B tj Represents a power recovery coefficient when a power recovery condition corresponding to the 2j-1 stage undervoltage or the 2j stage undervoltage is currently satisfied, B t-1 Indicating power restoration when the previous power restoration condition corresponding to any one of the undervoltage stages was satisfiedComplex coefficient, B t-1 Is equal to 1 if k j ' not an integer multiple of h, then C j If k is =1 j ' is an integer multiple of h, then C j ＝F j ，k j ' represents the number of times of the triggered 2j-1 stage undervoltage or 2j stage undervoltage when a power recovery condition corresponding to the 2j-1 stage undervoltage or the 2j stage undervoltage is satisfied, h represents a preset number threshold, C j Represents a limiting coefficient corresponding to the class 2j-1 undervoltage and the class 2j undervoltage, F j Representing the preset limiting coefficient threshold value corresponding to 2j-1 class undervoltage and 2j class undervoltage, 0<F j <1，D j Represents the preset minimum power recovery coefficient value corresponding to the 2j-1 class undervoltage and the 2j class undervoltage, 0<D j <1，E 2j-1 Represents a preset 2j-1 level undervoltage limit power coefficient threshold value, 0<E 2j-1 <1，E 2j Represents a preset 2 j-level undervoltage limit power coefficient threshold value, 0<E 2j <1,min () means taking a small operation, i.e., min (E) 2j-1 ，H j ) Represents taking E 2j-1 And H j Minimum of (d), min (E) 2j ，H j ) Represents taking E 2j And H j Max () represents a large operation, i.e., max (B) tj ，D j ) Represents taking B tj And D j Maximum value of (1), k j Is an integer and k j ' > 1,j is an integer and
the larger j, F j The smaller the value of (A), D j The smaller the value of (c).
Preferably, n =5,h takes a value of 1 to 3 times. Preset limiting coefficient threshold F corresponding to class 1 undervoltage and class 2 undervoltage 1 Is 0.7 to 0.95, and the preset limiting coefficient threshold F corresponding to the 3-level undervoltage and the 4-level undervoltage 2 Is 0.7 to 0.95, and F 1 >F 2 (ii) a Preset minimum power recovery coefficient value D corresponding to 1-stage undervoltage and 2-stage undervoltage 1 The value of (a) is 0.25-0.35, and the preset minimum power recovery coefficient value D corresponding to the 3-level undervoltage and the 4-level undervoltage 2 The value of (A) is 0.08-0.12. The values are obtained better through experimental calibrationThe value of the effect.
The invention discloses a discharge power control method of another power battery, which comprises the following steps:
monitoring the lowest monomer temperature T of the current power battery in real time min Minimum cell voltage U min And an SOC value.
According to the lowest unit temperature T of the current power battery min Minimum cell voltage U min And (4) judging: if the undervoltage is not triggered, the discharge power of the power battery is made to be P; if I-stage undervoltage is triggered, the discharge power of the power battery is set to be A i * P; if the n-stage undervoltage is triggered, the discharge power of the power battery is made to be 0; wherein, P represents the lowest single temperature T according to the current power battery min The SOC value inquires a preset discharge power meter to obtain a lookup discharge power, n represents a preset total undervoltage grade number, n is an integer and is not less than 2,1 and not more than i and not more than n-1,A i Represents the i-class undervoltage limit power coefficient, A i Is equal to E i ，E i Representing a preset i-level undervoltage limit power coefficient threshold, the larger i is, E i The smaller the value of (c).
And recording the triggered undervoltage series and the triggering times, and judging whether the power recovery condition corresponding to the undervoltage series is met. When the power recovery condition corresponding to the m-level undervoltage is met, the discharge power of the power battery is made to be H m * P, let A m ＝min(E m ，H m ). Wherein A is m Represents the m-level under-voltage limit power coefficient, H m Representing the power recovery coefficient, H, corresponding to the m-class undervoltage m ＝max(B tm ，D m )，B tm ＝C m *B t-1 ，B tm Representing the power recovery coefficient when the power recovery condition corresponding to the m-level undervoltage is currently satisfied, B t-1 Representing the power recovery coefficient when the power recovery condition corresponding to any one of the undervoltage stages was previously satisfied, B t-1 Is equal to 1 if k m "not an integer multiple of h, then C m If k is =1 m "is an integer multiple of h, then C m ＝F m ，k m "indicates an m-class brown-out that has been triggered when a power recovery condition corresponding to the m-class brown-out is satisfiedH represents a preset number threshold, C m Representing a limiting coefficient, F, corresponding to an m-level undervoltage m Representing a predetermined limiting coefficient threshold, 0, corresponding to an m-level under-voltage<F m <1，D m Represents a preset minimum power recovery coefficient value corresponding to the m-level undervoltage, 0<D m <1，E m Represents a preset m-level undervoltage limit power coefficient threshold value, 0<E m <1,min () represents a small operation, i.e., min (E) m ，H m ) Represents taking E m And H m Of, max () represents a large operation, i.e., max (B) tm ，D m ) Represents taking B tm And D m Maximum value of (1), k m "is an integer and k m "≧ 1,m is an integer and 1 ≦ m ≦ n-1,m is larger, F m The smaller the value of (A), D m The smaller the value of (c).
Preferably, n =5,h takes a value of 1 to 3 times. Preset limiting coefficient threshold F corresponding to class 1 under-voltage 1 Is 0.7-0.95, and a preset limiting coefficient threshold value F corresponding to the 2-stage undervoltage 2 Is 0.7 to 0.95, and a preset limiting coefficient threshold value F corresponding to the 3-stage under-voltage 3 Is 0.7-0.95, and a preset limiting coefficient threshold value F corresponding to the 4-stage under-voltage 4 Is 0.7 to 0.95, and F 1 >F 2 >F 3 >F 4 (ii) a Preset minimum power recovery coefficient value D corresponding to class 1 under-voltage 1 Is 0.25 to 0.35, and a preset minimum power recovery coefficient value D corresponding to the 2-stage undervoltage 2 Is 0.25-0.35, and a preset minimum power recovery coefficient value D corresponding to the 3-level under-voltage 3 Is 0.08 to 0.12, and a preset minimum power recovery coefficient value D corresponding to the 4-stage undervoltage 4 Is 0.08 to 0.12, and D 1 >D 2 ，D 3 >D 4 . These values are those which have been experimentally calibrated to achieve better results.
Preferably, the preset 1-level under-voltage limit power coefficient threshold value E 1 Equal to 0.75, preset threshold value E of class 2 under-voltage limit power coefficient 2 Equal to 0.5, a preset 3-level undervoltage limit power coefficient threshold E 3 Is equal to 025, preset 4-level undervoltage limit power coefficient threshold E 4 Equal to 0.25. The threshold values of the undervoltage limit power coefficient are respectively preset to be 0.75, 0.5, 0.25 and 0.25, the power is gradually limited, sudden power interruption can be avoided, and the safety risk is better reduced.
Preferably, if the lowest cell temperature T of the current power battery min Within a certain preset temperature interval, the lowest unit voltage U of the current power battery min And if the voltage is larger than or equal to the preset normal discharge voltage threshold corresponding to the preset temperature interval, judging that the undervoltage is not triggered. If the lowest unit temperature T of the current power battery min Within a certain preset temperature interval, the lowest unit voltage U of the current power battery min And judging to trigger the i-level undervoltage within an i-level preset voltage threshold interval corresponding to the preset temperature interval. If the lowest unit temperature T of the current power battery min Within a certain preset temperature interval, the lowest unit voltage U of the current power battery min And if the voltage is less than the preset discharge cut-off voltage corresponding to the preset temperature interval, judging to trigger the n-stage undervoltage. If the lowest unit temperature T of the current power battery min In a certain preset temperature interval, i-level under-voltage is triggered, but the lowest unit voltage U of the current power battery min And if the voltage is larger than the i-level preset recovery voltage threshold corresponding to the preset temperature interval, judging that the power recovery condition corresponding to the i-level undervoltage is met. When the undervoltage stage number (grade) is divided, the temperature and the voltage are considered, so that the division of the undervoltage stage number is more reasonable and accurate.
The discharge power control system of the power battery comprises a controller, wherein the controller is programmed to execute the discharge power control method of the power battery.
The electric automobile comprises the discharge power control system of the power battery.
The invention has the following effects:
(1) The discharging power is limited in a grading manner according to the undervoltage stage number, and the discharging power is automatically adjusted according to the undervoltage triggering times (frequency), so that closed-loop control (self-adaptive limiting of the discharging power) of the discharging power is realized, the use of customers to different working conditions can be automatically adapted, the frequent fluctuation of the power of the discharging end of the power battery can be effectively limited even under the limited use working condition, the running smoothness is ensured, and the problem of poor driving experience of the customers caused by the frequent fluctuation of the power is solved.
(2) The discharging power is limited in a grading manner according to the undervoltage stage number, and the discharging power is automatically adjusted according to the undervoltage triggering frequency, so that the closed-loop control of the discharging power (self-adaptive limiting of the discharging power) is realized, the maximum discharging capacity of the power battery at low temperature can be ensured, and the power performance of the discharging tail end of the power battery is improved.
(3) The discharging power is limited according to the stage number of the undervoltage stage in a grading manner, the discharging power is automatically adjusted according to the undervoltage triggering times (frequency), closed-loop control (self-adaptive limiting of the discharging power) of the discharging power is achieved, the discharging power is limited in advance when the discharging end capacity of the power battery is insufficient, the problems of power fluctuation and power interruption caused by mismatching of the discharging end power and the power battery capacity when SOC estimation is inaccurate are solved, the problem of poor user experience is solved, and safety risks caused by sudden power interruption are avoided.
Drawings
Fig. 1 is a flow chart of discharge power control of a power battery in embodiment 1.
Detailed Description
Referring to table 1, in both embodiments 1 and 2, the temperature is divided into 3 preset temperature intervals, and the number of the under-voltage stages is set to 5 under-voltage stages (i.e., 1-stage under-voltage, 2-stage under-voltage, 3-stage under-voltage, 4-stage under-voltage, 5-stage under-voltage) according to the lowest unit voltage U of the power battery.
The 3 preset temperature intervals are respectively as follows: the method comprises the following steps of (-5 ℃) (+ ∞) (namely a temperature range one), (-20 ℃) (-5 ℃) (-20 ℃), (-31 ℃), -20 ℃ (-three temperature range), and when the temperature is less than or equal to-31 ℃, the power battery stops working and cannot discharge (namely the discharge power is 0), namely the operating temperature of the power battery of the electric automobile is greater than-31 ℃.
The preset normal discharge voltage threshold corresponding to the first temperature interval is 3.15V; the preset voltage threshold interval corresponding to the 4 undervoltage grades corresponding to the first temperature interval is as follows: a 1-stage preset voltage threshold interval [3.08v, 3.15v), a 2-stage preset voltage threshold interval [3.0v, 3.08v), a 3-stage preset voltage threshold interval [2.9v, 3.0v), and a 4-stage preset voltage threshold interval [2.8v, 2.9v). The preset discharge cut-off voltage corresponding to the temperature interval one is 2.8V. The 1-level preset recovery voltage corresponding to the first temperature interval is 3.2V, the 2-level preset recovery voltage corresponding to the first temperature interval is 3.15V, the 3-level preset recovery voltage corresponding to the first temperature interval is 3.1V, and the 4-level preset recovery voltage corresponding to the first temperature interval is 3.0V.
The preset normal discharge voltage threshold corresponding to the temperature interval II is 2.85V; the preset voltage threshold interval corresponding to the 4 undervoltage grades corresponding to the temperature interval two is as follows: a 1-level preset voltage threshold interval [2.78v,2.85v ], a 2-level preset voltage threshold interval [2.7v,2.78v ], a 3-level preset voltage threshold interval [2.6v,2.7v ], and a 4-level preset voltage threshold interval [2.5v,2.6 v). The preset discharge cut-off voltage corresponding to the temperature interval two is 2.5V. The 1-level preset recovery voltage corresponding to the second temperature interval is 2.9V, the 2-level preset recovery voltage corresponding to the second temperature interval is 2.85V, the 3-level preset recovery voltage corresponding to the second temperature interval is 2.8V, and the 4-level preset recovery voltage corresponding to the second temperature interval is 2.7V.
The preset normal discharge voltage threshold corresponding to the temperature interval III is 2.45V; the preset voltage threshold interval corresponding to the 4 undervoltage grades corresponding to the temperature interval three is as follows: a level 1 preset voltage threshold interval [2.38v,2.45v ], a level 2 preset voltage threshold interval [2.3v,2.38v ], a level 3 preset voltage threshold interval [2.2v,2.3v ], and a level 4 preset voltage threshold interval [2.1v, 2.2v). The preset discharge cut-off voltage corresponding to the temperature interval three is 2.1V. The 1-stage preset recovery voltage corresponding to the temperature interval three is 2.5V, the 2-stage preset recovery voltage corresponding to the temperature interval three is 2.45V, the 3-stage preset recovery voltage corresponding to the temperature interval three is 2.4V, and the 4-stage preset recovery voltage corresponding to the temperature interval three is 2.3V.
TABLE 1 (temperature T in units:. Degree.C., voltage U in units V)
Example 1: as shown in fig. 1, the method for controlling discharge power of a power battery in this embodiment includes:
s1, monitoring the lowest monomer temperature T of the current power battery in real time min Minimum cell voltage U min And an SOC value.
S2, according to the lowest monomer temperature T of the current power battery min Minimum cell voltage U min Judging whether to trigger undervoltage and the undervoltage level of the undervoltage, and controlling the discharge power of the power battery. The method comprises the following specific steps:
if the lowest unit temperature T of the current power battery min Within a certain preset temperature interval, the lowest unit voltage U of the current power battery min If the discharge voltage is larger than or equal to the preset normal discharge voltage threshold value corresponding to the preset temperature interval, it is judged that undervoltage is not triggered, and the discharge power of the power battery is P. For example, when T min >-5 ℃ and U min And when the voltage is more than or equal to 3.15V, judging that undervoltage is not triggered, and enabling the discharge power of the power battery to be P. When the temperature is-20 DEG C<T min At most-5 deg.C, and U is min And when the voltage is more than or equal to 2.85V, judging that undervoltage is not triggered, and enabling the discharge power of the power battery to be P. When the temperature is-31 DEG C<T min At the temperature of less than or equal to-20 ℃, and U min And when the voltage is more than or equal to 2.45V, judging that undervoltage is not triggered, and enabling the discharge power of the power battery to be P. Wherein, P represents the lowest single temperature T according to the current power battery min And the SOC value inquires a preset discharge power meter to obtain the table-look-up discharge power.
If the lowest unit temperature T of the current power battery min Within a certain preset temperature interval, and the lowest unit voltage U of the current power battery min And judging to trigger the i-level undervoltage within an i-level preset voltage threshold interval corresponding to the preset temperature interval. In the embodiment, the preset total under-voltage stage number n =5,1 is not less than i and not more than 4. For example, when T min >U is less than or equal to 3.08V and is less than or equal to 5 DEG below zero min When the voltage is less than 3.15V, judging to trigger the 1-stage undervoltage to make the discharge power of the power battery A 1 * And P. When T is min >U is less than or equal to 2.8V and is less than or equal to 5 DEG below zero min When the voltage is less than 2.9V, judging to trigger 4-stage undervoltage to make the discharge power of the power battery be A 4 * And P. When the temperature is-20 DEG C<T min U is less than or equal to-5 ℃ and 2.7V is less than or equal to min When the voltage is less than 2.78V, judging to trigger 2-stage undervoltage to make the discharge power of the power battery A 2 * And P. When the temperature is-31 DEG C<T min U is not less than-20 ℃ and not more than 2.2V min When the voltage is less than 2.3V, judging to trigger 3-stage undervoltage to make the discharge power of the power battery be A 3 * And P. Wherein A is 1 Represents the class-1 undervoltage limit power coefficient, A 2 Represents the class 2 under-voltage limit power coefficient, A 3 Represents the class-3 under-voltage limit power coefficient, A 4 Represents the class 4 undervoltage limit power coefficient, A 1 、A 2 、A 3 、A 4 Will change with the number of times of triggering of the undervoltage; a. The 1 Is equal to E 1 ，E 1 Represents a predetermined class-1 undervoltage limit power coefficient threshold, E 1 ＝0.75；A 2 Is equal to E 2 ，E 2 Represents a preset 2-level undervoltage power factor threshold, E 2 ＝0.5；A 3 Is equal to E 3 ，E 3 Representing a preset class-3 undervoltage limit power coefficient threshold, E 3 ＝0.25；A 4 Is equal to E 4 ，E 4 Representing a preset 4-level undervoltage limit power coefficient threshold, E 4 ＝0.25。
If the lowest unit temperature T of the current power battery min Within a certain preset temperature interval, the lowest unit voltage U of the current power battery min And if the discharge cutoff voltage is smaller than the preset discharge cutoff voltage corresponding to the preset temperature interval, judging to trigger 5-stage undervoltage, and enabling the discharge power of the power battery to be 0. For example, when T min >-5 ℃ and U min <And 2.8V, judging to trigger 5-stage undervoltage, and enabling the discharge power of the power battery to be 0. When the temperature is-20 DEG C<T min At most-5 deg.C, and U is min <And 2.5V, judging to trigger 5-stage undervoltage, and enabling the discharge power of the power battery to be 0. When the temperature is-31 DEG C<T min At the temperature of less than or equal to-20 ℃, and U min <And 2.1V, judging to trigger 5-stage undervoltage, and enabling the discharge power of the power battery to be 0.
S3, recording the number of triggered undervoltage stages and the triggering times and judgingWhether the power recovery condition corresponding to the undervoltage stage is satisfied or not, and if the power recovery condition corresponding to the undervoltage stage is satisfied, the discharge power of the rechargeable battery is controlled, and the limited power coefficient corresponding to the undervoltage stage is updated (namely, A is updated 1 Or A 2 Or A 3 Or A 4 ). The method specifically comprises the following steps:
if the lowest unit temperature T of the current power battery min In a certain preset temperature interval, i-level under-voltage is triggered, but the lowest unit voltage U of the current power battery min And if the voltage value is larger than the i-level preset recovery voltage threshold value corresponding to the preset temperature interval, judging that the power recovery condition corresponding to the i-level undervoltage is met. For example, if T min >-5 ℃ and has triggered a level 1 brown-out, but U min >And 3.2V, judging that the power recovery condition corresponding to the 1-level undervoltage is met. If the temperature is-20 DEG C<T min At or below-5 deg.C, and triggering 2-stage under-voltage, but U min >2.85V, it is determined that the power recovery condition corresponding to the class 2 brown-out is satisfied. If the temperature is-31 DEG C<T min At or below-20 deg.C, and triggering 3-stage under-voltage, but U min >2.4V, it is determined that the power recovery condition corresponding to the class-3 under-voltage is satisfied. If T is min >-5 ℃ and has triggered a 4-level brown-out, but U min >3.0V, it is determined that the power recovery condition corresponding to the class 4 brown-out is satisfied.
When the power recovery condition corresponding to the 1-level undervoltage is met, the discharge power of the power battery is made to be H 1 * P, let A 1 ＝min(E 1 ，H 1 ) I.e. update A 1 . When the power recovery condition corresponding to the 2-stage undervoltage is met, the discharge power of the power battery is H 1 * P, let A 2 ＝min(E 2 ，H 1 ) I.e. update A 2 . Wherein H 1 Represents the power recovery coefficient corresponding to the class 1 undervoltage and the class 2 undervoltage, H 1 ＝max(B t1 ，D 1 )，B t1 ＝C 1 *B t-1 ，B t1 Represents a power recovery coefficient when a power recovery condition corresponding to the class 1 undervoltage or the class 2 undervoltage is currently satisfied, B t-1 Indicating power restoration when the previous power restoration condition corresponding to any one of the undervoltage stages was satisfiedComplex coefficient, B t-1 Is equal to 1 if k 1 ' not an integer multiple of 2 (h =2 in the present embodiment), C 1 If k is =1 1 ' is an integer multiple of 2, then C 1 ＝F 1 ＝0.9，k 1 ' represents the number of times of a class-1 undervoltage or a class-2 undervoltage that has been triggered when a power recovery condition corresponding to the class-1 undervoltage or the class-2 undervoltage is satisfied, C 1 Representing the limiting coefficients corresponding to class 1 undervoltages, class 2 undervoltages, F 1 Representing preset limiting coefficient thresholds corresponding to class 1 undervoltage and class 2 undervoltage, F 1 ＝0.9，D 1 Represents the preset minimum power recovery coefficient values corresponding to the class 1 undervoltage and the class 2 undervoltage, D 1 =0.3,min () denotes taking a small operation, i.e. min (E) 1 ，H 1 ) Represents taking E 1 And H 1 Minimum of (d), min (E) 2 ，H 1 ) Represents taking E 2 And H 1 Max () represents a large operation, i.e., max (B) t1 ，D 1 ) Represents taking B t1 And D 1 Maximum value of (1), k 1 Is an integer and k 1 '≥1。
When the power recovery condition corresponding to the 3-stage undervoltage is met, the discharge power of the power battery is made to be H 2 * P, let A 3 ＝min(E 3 ，H 2 ) I.e. update A 3 . When the power recovery condition corresponding to the 4-stage undervoltage is met, the discharge power of the power battery is made to be H 2 * P, let A 4 ＝min(E 4 ，H 2 ) I.e. update A 4 . Wherein H 2 Represents the power recovery coefficient corresponding to the class 3 undervoltage and class 4 undervoltage, H 2 ＝max(B t2 ，D 2 )，B t2 ＝C 2 *B t-1 ，B t2 Representing the power recovery coefficient when the current power recovery condition corresponding to the class 3 undervoltage or the class 4 undervoltage is satisfied, if k 2 ' is not an integer multiple of 2, then C 2 1 if k 2 ' is an integer multiple of 2, then C 2 ＝F 2 ＝0.8，k 2 ' represents the number of times of 3-level brown-out or 4-level brown-out that has been triggered when a power recovery condition corresponding to 3-level brown-out or 4-level brown-out is satisfied, C 2 Indicating correspondence with 3-level brown-out, 4-level brown-outLimiting coefficient of (D), F 2 Representing preset limiting coefficient thresholds, F, corresponding to class 3 undervoltage and class 4 undervoltage 2 ＝0.8，D 2 Represents the preset minimum power recovery coefficient values corresponding to the 3-level undervoltage and the 4-level undervoltage, D 2 ＝0.1，min(E 3 ，H 2 ) Represents taking E 3 And H 2 Minimum of (d), min (E) 4 ，H 2 ) Represents taking E 4 And H 2 Minimum value of (1), max (B) t2 ，D 2 ) Represents taking B t2 And D 2 Maximum value of (1), k 2 Is an integer and k 2 '≥1。
For example, the undervoltage is not triggered before, and the number of times of the triggered 1-stage undervoltage is 1 (i.e., k) when the power recovery condition corresponding to the 1-stage undervoltage is satisfied 1 ' = 1), C 1 ＝1，B t-1 ＝1，B t1 ＝1，H 1 ＝1，A 1 =0.75; the number of triggered stage 1 undervoltage and stage 2 undervoltage is 2 times (i.e. k) when the power recovery condition corresponding to stage 2 undervoltage is satisfied 1 ' =2, 1-time class 1 under-voltage has been triggered, 1-time class 2 under-voltage has been triggered), C 1 ＝0.9，B t-1 ＝1，B t1 ＝0.9，H 1 ＝0.9，A 2 =0.5; the number of triggered stage 1 undervoltage and stage 2 undervoltage is 4 (i.e. k) times when the power recovery condition corresponding to stage 2 undervoltage is satisfied 1 ' =4, 2 times of 1-stage undervoltage trigger, 2 times of 2-stage undervoltage trigger) C 1 ＝0.9，B t-1 ＝0.9，B t1 ＝0.81，H 1 ＝0.81，A 2 =0.5; when the number of triggered 1-level undervoltage and 2-level undervoltage is 6 times and the number of triggered 3-level undervoltage and 4-level undervoltage is 10 times when the power recovery condition corresponding to 4-level undervoltage is satisfied, C 2 ＝0.8，B t-1 ＝0.2986，B t2 ＝0.2389，H 2 ＝0.2389，A 4 ＝0.2389。
The embodiment also provides a discharge power control system of the power battery, which comprises a controller programmed to execute the discharge power control method of the power battery.
The embodiment also provides an electric automobile which comprises the discharge power control system of the power battery.
Example 2: most of the steps of the discharge power control method of the power battery in this embodiment are the same as those in embodiment 1, except that: and S3, controlling the discharge power mode of the power battery and updating the limited power coefficient corresponding to the undervoltage stage number. The method specifically comprises the following steps: when the power recovery condition corresponding to the 1-level undervoltage is met, the discharge power of the power battery is made to be H 1 * P, let A 1 ＝min(E 1 ，H 1 ) I.e. update A 1 . Wherein H 1 Representing the power recovery coefficient, H, corresponding to a class 1 undervoltage 1 ＝max(B t1 ，D 1 )，B t1 ＝C 1 *B t-1 ，B t1 Representing the power recovery coefficient when the power recovery condition corresponding to the class 1 under-voltage is currently satisfied, B t-1 Representing the power recovery coefficient when the power recovery condition corresponding to any one of the undervoltage stages was previously satisfied, B t-1 Is equal to 1 if k 1 "is not an integer multiple of 3 (h =3 in the present embodiment), C 1 1 if k 1 "is an integer multiple of 3, then C 1 ＝F 1 ，k 1 "indicates the number of times a level 1 brown-out has been triggered when a power recovery condition corresponding to the level 1 brown-out is satisfied, C 1 Representing a limiting coefficient, F, corresponding to a class 1 under-voltage 1 Representing a predetermined limiting coefficient threshold, F, corresponding to a class 1 under-voltage 1 ＝0.9，D 1 Represents a predetermined minimum power recovery coefficient value, D, corresponding to a class 1 under-voltage 1 =0.35,min () denotes taking a small operation, i.e. min (E) 1 ，H 1 ) Represents taking E 1 And H 1 Max () represents a large operation, i.e., max (B) t1 ，D 1 ) Represents taking B t1 And D 1 Maximum value of (1), k 1 "is an integer and k 1 "≥1。
When the power recovery condition corresponding to the 2-stage undervoltage is met, the discharge power of the power battery is made to be H 2 * P, let A 2 ＝min(E 2 ，H 2 ) I.e. update A 2 . Wherein H 2 Representing the power recovery coefficient, H, corresponding to a class 2 undervoltage 2 ＝max(B t2 ，D 2 )，B t2 ＝C 2 *B t-1 ，B t2 Representing the power recovery coefficient when the power recovery condition corresponding to the 2-level under-voltage is currently satisfied, if k 2 "not an integer multiple of 3, then C 2 If k is =1 2 "is an integer multiple of 3, then C 2 ＝F 2 ，k 2 "indicates the number of times the 2-stage brown-out has been triggered when the power recovery condition corresponding to the 2-stage brown-out is satisfied, C 2 Representing a limiting factor, F, corresponding to a class 2 undervoltage 2 Representing a predetermined limiting coefficient threshold, F, corresponding to a class 2 under-voltage 2 ＝0.85，D 2 Representing a preset minimum power recovery coefficient value, D, corresponding to a class 2 undervoltage 2 ＝0.3，min(E 2 ，H 2 ) Represents taking E 2 And H 2 Minimum of (d), max (B) t2 ，D 2 ) Represents taking B t2 And D 2 Maximum value of (1), k 2 "is an integer and k 2 "≥1。
When the power recovery condition corresponding to the 3-level undervoltage is met, the discharge power of the power battery is H 3 * P, let A 3 ＝min(E 3 ，H 3 ) I.e. update A 3 . Wherein H 3 Representing the power recovery coefficient, H, corresponding to a class 3 undervoltage 3 ＝max(B t3 ，D 3 )，B t3 ＝C 3 *B t-1 ，B t3 Represents the power recovery coefficient when the power recovery condition corresponding to the class 3 under-voltage is currently satisfied, if k 3 "not an integer multiple of 3, then C 3 If k is =1 3 "is an integer multiple of 3, then C 3 ＝F 3 ，k 3 "indicates the number of times the class-3 brown-out has been triggered when the power recovery condition corresponding to the class-3 brown-out is satisfied, C 3 Representing a limiting factor, F, corresponding to a class 3 under-voltage 3 Representing a predetermined limiting coefficient threshold, F, corresponding to a class 3 under-voltage 3 ＝0.8，D 3 Represents a predetermined minimum power recovery coefficient value, D, corresponding to a class 3 under-voltage 3 ＝0.12，min(E 3 ，H 3 ) Represents taking E 3 And H 3 Minimum value of (1), max (B) t3 ，D 3 ) Represents taking B t3 And D 3 The most important ofLarge value, k 3 "is an integer and k 3 "≥1。
When the power recovery condition corresponding to the 4-level undervoltage is met, the discharge power of the power battery is set to be H 4 * P, let A 4 ＝min(E 4 ，H 4 ) I.e. update A 4 . Wherein H 4 Representing the power recovery coefficient, H, corresponding to a class 4 under-voltage 4 ＝max(B t4 ，D 4 )，B t4 ＝C 4 *B t-1 ，B t4 Indicating the power recovery coefficient when the power recovery condition corresponding to the class 4 under-voltage is currently satisfied, if k 4 "is not an integer multiple of 3, then C 4 If k is =1 4 "is an integer multiple of 3, then C 4 ＝F 4 ，k 4 "indicates the number of times the class-4 brown-out has been triggered when the power recovery condition corresponding to the class-4 brown-out is satisfied, C 4 Representing a limiting factor, F, corresponding to a class 4 under-voltage 4 Representing a predetermined limiting coefficient threshold, F, corresponding to a class 4 under-voltage 4 ＝0.75，D 4 Represents a predetermined minimum power recovery coefficient value, D, corresponding to a class 4 under-voltage 4 ＝0.1，min(E 4 ，H 4 ) Represents taking E 4 And H 4 Minimum value of (1), max (B) t4 ，D 4 ) Represents taking B t4 And D 4 Maximum value of (1), k 4 "is an integer and k 4 "≥1。
For example, the brown-out is not triggered before, and the number of times the brown-out of level 1 has been triggered when the power recovery condition corresponding to the brown-out of level 1 is satisfied is 2 (i.e., k) 1 "= 2), C 1 ＝1，B t-1 ＝1，B t1 ＝1，H 1 ＝1，A 1 =0.75; the number of times the 2-level brown-out has been triggered when the power recovery condition corresponding to the 2-level brown-out is satisfied is 3 (i.e., k) 2 "= 3), C 2 ＝0.85，B t-1 ＝1，B t2 ＝0.85，H 2 ＝0.85，A 2 =0.5; the number of times the level 2 brown-out has been triggered when the power recovery condition corresponding to the level 2 brown-out is satisfied is 6 (i.e., k) 2 "= 6), C 2 ＝0.85，B t-1 ＝0.85，B t2 ＝0.7225，H 2 ＝0.7225，A 2 =0.5; when it is satisfied withThe number of triggered stage 1 undervoltages is 6, the number of triggered stage 2 undervoltages is 9, the number of triggered stage 3 undervoltages is 9, and the number of triggered stage 4 undervoltages is 3, C 4 ＝0.75，B t-1 ＝0.2547，B t4 ＝0.191，H 4 ＝0.191，A 4 ＝0.191。
Claims (10)
1. A discharge power control method of a power battery is characterized by comprising the following steps:
monitoring the lowest monomer temperature T of the current power battery in real time min Minimum cell voltage U min And an SOC value;
according to the lowest unit temperature T of the current power battery min Minimum cell voltage U min And (4) judging: if the undervoltage is not triggered, the discharge power of the power battery is made to be P; if I-stage undervoltage is triggered, the discharge power of the power battery is set to be A i * P; if n-stage undervoltage is triggered, the discharge power of the power battery is set to be 0; wherein, P represents the lowest single temperature T according to the current power battery min The SOC value inquires a preset discharge power meter to obtain a lookup discharge power, n represents a preset total undervoltage stage number, n is an odd number, n is not less than 3,1 and not more than i and not more than n-1,A i Represents the i-class undervoltage limit power coefficient, A i Is equal to E i ，E i Representing a preset i-level undervoltage limit power coefficient threshold;
recording the triggered undervoltage level and the triggering times, and judging whether a power recovery condition corresponding to the undervoltage level is met; when the power recovery condition corresponding to the 2j-1 stage undervoltage is met, the discharge power of the power battery is H j * P, let A 2j-1 ＝min(E 2j-1 ，H j ) (ii) a When the power recovery condition corresponding to the 2 j-level undervoltage is met, the discharge power of the power battery is made to be H j * P, let A 2j ＝min(E 2j ，H j )；
Wherein A is 2j-1 Represents the 2j-1 class under-voltage limit power coefficient, A 2j Represents the 2 j-level undervoltage limit power coefficient, H j Indicating a 2j-1 stage, 2j stage under-voltage correspondencePower recovery coefficient of H j ＝max(B tj ，D j )，B tj ＝C j *B t-1 ，B tj Represents a power recovery coefficient when a power recovery condition corresponding to a 2j-1 stage or 2j stage under-voltage is currently satisfied, B t-1 Representing the power recovery coefficient when the power recovery condition corresponding to any one of the undervoltage stages was previously satisfied, B t-1 Is equal to 1 if k j ' not an integer multiple of h, then C j If k is =1 j ' is an integer multiple of h, then C j ＝F j ，k j ' represents the number of times of the 2j-1 or 2j stage undervoltage that has been triggered when the power recovery condition corresponding to the 2j-1 or 2j stage undervoltage is satisfied, h represents a preset number threshold, C j Represents the limiting coefficients corresponding to the 2j-1 class, 2j class undervoltages, F j Represents the preset limiting coefficient threshold value corresponding to the undervoltage of 2j-1 level and 2j level, 0<F j <1，D j Represents the preset minimum power recovery coefficient value corresponding to 2j-1 class and 2j class under-voltage, 0<D j <1，E 2j-1 Represents a preset 2j-1 level undervoltage limit power coefficient threshold value, 0<E 2j-1 <1，E 2j Represents a preset 2 j-level undervoltage limit power coefficient threshold value, 0<E 2j <1,min () denotes a small operation, max () denotes a large operation,
2. the discharge power control method of a power battery according to claim 1, characterized in that: the value of n =5,h is 1-3 times; preset limiting coefficient threshold F corresponding to class 1, class 2 under-voltage 1 Is 0.7 to 0.95, and the preset limiting coefficient threshold F corresponding to the 3-level and 4-level under-voltage 2 Is 0.7 to 0.95, and F 1 >F 2 (ii) a Preset minimum power recovery coefficient value D corresponding to 1-stage and 2-stage under-voltage 1 Is 0.25 to 0.35, and the preset minimum power recovery coefficient value D corresponding to the 3-level and 4-level undervoltage 2 The value of (A) is 0.08-0.12.
3. The discharge power control method of a power battery according to claim 1, characterized in that: preset threshold value E of class 1 under-voltage limit power coefficient 1 Equal to 0.75, a preset class 2 undervoltage limit power coefficient threshold E 2 Equal to 0.5, a preset threshold value E of the class-3 undervoltage limit power coefficient 3 Equal to 0.25, preset threshold value E of 4-stage undervoltage limit power coefficient 4 Equal to 0.25.
4. The discharge power control method of a power battery according to any one of claims 1 to 3, characterized in that:
if T is min Within a certain preset temperature interval, and U min If the voltage is greater than or equal to a preset normal discharge voltage threshold value corresponding to the preset temperature interval, judging that undervoltage is not triggered;
if T is min Within a certain preset temperature interval, and U min Judging to trigger i-level undervoltage within an i-level preset voltage threshold interval corresponding to the preset temperature interval;
if T is min Within a certain preset temperature interval, and U min If the voltage is less than the preset discharge cut-off voltage corresponding to the preset temperature interval, judging to trigger the n-stage undervoltage;
if T is min Within a certain preset temperature interval, i-stage under-voltage is triggered, but U min And if the voltage is larger than the i-level preset recovery voltage threshold corresponding to the preset temperature interval, judging that the power recovery condition corresponding to the i-level undervoltage is met.
5. A discharge power control method of a power battery is characterized by comprising the following steps:
monitoring the lowest monomer temperature T of the current power battery in real time min Minimum cell voltage U min And an SOC value;
according to the lowest unit temperature T of the current power battery min Minimum cell voltage U min And (4) judging: if the undervoltage is not triggered, the discharge power of the power battery is made to be P; if I-level undervoltage is triggered, the discharge power of the power battery is set to be A i * P; if n-stage undervoltage is triggered, the discharge power of the power battery is set to be 0; wherein, P represents the lowest single temperature T according to the current power battery min The SOC value inquires a preset discharge power meter to obtain a lookup discharge power, n represents a preset total undervoltage grade number, n is an integer and is not less than 2,1 and not more than i and not more than n-1,A i Representing the i-class under-voltage limit power coefficient, A i Is equal to E i ，E i Representing a preset i-level undervoltage limit power coefficient threshold;
recording the triggered undervoltage level and the triggering times, and judging whether a power recovery condition corresponding to the undervoltage level is met; when the power recovery condition corresponding to the m-level undervoltage is met, the discharge power of the power battery is made to be H m * P, let A m ＝min(E m ，H m ) (ii) a Wherein A is m Represents the undervoltage limit power coefficient of m levels, H m Representing the power recovery coefficient, H, corresponding to the m-class undervoltage m ＝max(B tm ，D m )，B tm ＝C m *B t-1 ，B tm Representing the power recovery coefficient when the power recovery condition corresponding to the m-level undervoltage is currently satisfied, B t-1 Representing the power recovery coefficient when the power recovery condition corresponding to any one of the undervoltage stages was previously satisfied, B t-1 Is equal to 1 if k m "is not an integer multiple of h, then C m If k is =1 m "is an integer multiple of h, then C m ＝F m ，k m "represents the number of times of the triggered m-level undervoltage when the power recovery condition corresponding to the m-level undervoltage is satisfied, h represents a preset number threshold, C m Representing a limiting coefficient, F, corresponding to an m-level undervoltage m Representing a predetermined limiting coefficient threshold, 0, corresponding to an m-level under-voltage<F m <1，D m Represents a preset minimum power recovery coefficient value corresponding to the m-level undervoltage, 0<D m <1，E m Representing a preset m-level undervoltage limit power coefficient threshold, 0<E m <1,min () represents a small operation, max () represents a large operation, k m "≥1，1≤m≤n-1。
6. The device of claim 5The discharge power control method of the force battery is characterized in that: the value of n =5,h is 1-3 times; preset limiting coefficient threshold F corresponding to class 1 under-voltage 1 Is 0.7-0.95, and a preset limiting coefficient threshold value F corresponding to the 2-stage undervoltage 2 Is 0.7 to 0.95, and a preset limiting coefficient threshold value F corresponding to the 3-stage under-voltage 3 Is 0.7-0.95, and a preset limiting coefficient threshold value F corresponding to the 4-level undervoltage 4 Is 0.7 to 0.95, and F 1 >F 2 >F 3 >F 4 (ii) a Preset minimum power recovery coefficient value D corresponding to class 1 under-voltage 1 Is 0.25 to 0.35, and a preset minimum power recovery coefficient value D corresponding to the 2-stage undervoltage 2 Is 0.25 to 0.35, and a preset minimum power recovery coefficient value D corresponding to the 3-stage undervoltage 3 Is 0.08 to 0.12, and a preset minimum power recovery coefficient value D corresponding to the 4-stage undervoltage 4 Is 0.08 to 0.12, and D 1 >D 2 ，D 3 >D 4 。
7. The discharge power control method of a power battery according to claim 5, characterized in that: preset level-1 undervoltage limit power coefficient threshold E 1 Equal to 0.75, preset threshold value E of class 2 under-voltage limit power coefficient 2 Equal to 0.5, a preset 3-level undervoltage limit power coefficient threshold E 3 Equal to 0.25, preset threshold value E of 4-stage undervoltage limit power coefficient 4 Equal to 0.25.
8. The discharge power control method of a power battery according to any one of claims 5 to 7, characterized in that:
if T is min Within a certain preset temperature interval, and U min If the voltage is larger than or equal to a preset normal discharge voltage threshold value corresponding to the preset temperature interval, judging that the undervoltage is not triggered;
if T is min Within a certain preset temperature interval, and U min Judging to trigger i-level undervoltage within an i-level preset voltage threshold interval corresponding to the preset temperature interval;
if T is min Within a certain preset temperature range, and U min If the voltage is less than the preset discharge cut-off voltage corresponding to the preset temperature interval, judging to trigger the n-stage undervoltage;
if T is min Within a certain preset temperature interval, i-stage under-voltage is triggered, but U min And if the voltage value is larger than the i-level preset recovery voltage threshold value corresponding to the preset temperature interval, judging that the power recovery condition corresponding to the i-level undervoltage is met.
9. A discharge power control system of a power battery comprises a controller, and is characterized in that: the controller is programmed to perform the discharge power control method according to any one of claims 1 to 8.
10. An electric vehicle, characterized in that: comprising the discharge power control system of claim 9.
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