An automatic charging and discharging system for new energy bus batteries

Abstract

The invention discloses an automatic charging and discharging system for new energy bus batteries, and relates to the technical field of new energy bus batteries. It solves the problem that the charging and discharging states of different batteries are changed due to the failure to change the power of each battery, thereby causing numerical fluctuations in charging and discharging. The invention confirms the charging voltage change value of each different single group of batteries to identify whether there is a related abnormality in the voltage change value, and then performs power adjustment for the determined abnormal voltage to ensure that the charging power used by each battery is different during charging, to ensure that the corresponding battery will not be overcharged or overheated, to ensure the overall charging effect of the corresponding battery, and based on the charging power used in the corresponding charging process, performs relevant evaluation of the output power, and then executes the corresponding evaluated output power to ensure that each battery can be discharged normally and meet the power demand of the corresponding bus at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy bus batteries, and in particular to an automatic charging and discharging system for new energy bus batteries. Background Art

[0002] Electric vehicle batteries are divided into two categories, storage batteries and fuel cells. Storage batteries are suitable for pure electric vehicles, including lead-acid batteries, nickel-metal hydride batteries, sodium-sulfur batteries, secondary lithium batteries, air batteries, and ternary lithium batteries;

[0003] The application with publication number CN106785240A discloses an automatic temperature control system for new energy vehicle batteries based on a charge and discharge mode, which belongs to the field of new energy vehicles and solves the problem that the battery temperature is difficult to control, including: a heat preservation agent storage tank, the heat preservation agent storage tank is used to store circulating heat preservation agents; a flow pump, the flow pump is connected to the heat preservation agent storage tank; a heater, the heater is connected to the flow pump; a battery system, the heater is connected to the battery system, and a temperature sensor is provided on the connected pipe; a heat dissipation system, the heat dissipation system is respectively connected to the battery system and the heat preservation agent storage tank; a controller module, the controller module is connected to a switch module, and is respectively connected to the flow pump, the temperature sensor, and the heater;

[0004] During the charging and discharging process, the bus batteries are generally charged and discharged based on a constant charging power and a constant discharging power. However, after long-term use, the chemical properties of each battery group in the battery module change, causing the internal resistance of the battery to change, resulting in inconsistent resistance of each battery group in the battery module. In the actual charging process, some batteries will overheat, which will cause some batteries to be damaged again. Since the power is not changed for each battery, the charging and discharging status of each different battery changes, resulting in fluctuations in the charging and discharging values. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an automatic charging and discharging system for new energy bus batteries, which solves the problem that power changes are not made for each battery, resulting in changes in the charging and discharging states of each different battery, thereby causing numerical fluctuations in charging and discharging.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automatic charging and discharging system for new energy bus batteries, comprising:

[0007] The voltage monitoring end monitors the voltage value of a single battery in the battery pack inside the new energy bus in real time;

[0008] The power primary control end preferentially uses the preset standard power to charge the single battery in the battery pack. Based on the voltage value of each single battery monitored in real time, the standard power is pre-adjusted to determine the adjustment power so that the voltage change value per unit time of each single battery is consistent. The specific method is as follows:

[0009] In a set standard power charging cycle, the voltage change values ​​of different batteries per unit time are determined, and the maximum voltage change value is selected from the determined voltage change values;

[0010] The standard power of each battery group is increased, and the voltage change value of the corresponding battery per unit time is stopped when it reaches the maximum voltage change value, and the increased standard power is calibrated as the adjusted power;

[0011] The calibrated regulated power is used as the charging power in the subsequent charging process of the corresponding single battery group;

[0012] The numerical evaluation end, after determining the relevant charging power of a single battery group, performs numerical analysis on the real-time voltage monitored by each single battery group, evaluates whether there is an abnormal change value in the subsequent charging process, and transmits the existing abnormal change value to the power control determination end. The specific method is as follows:

[0013] Based on the real-time monitored voltage, determine the voltage change value of the corresponding single battery per unit time and calibrate it as B i , where i represents a different single group of batteries, and its voltage change value is the difference between the voltage at the next time and the voltage at the previous time;

[0014] Identify voltage change value B i Satisfied: B i ∈[ZB-Y1, ZB+Y1], where ZB is the maximum voltage change value determined, and Y1 is the preset fluctuation value. If it is satisfied, the numerical evaluation can be continued. If it is not satisfied, B i The voltage change value of <(ZB-Y1) is calibrated as abnormally low value, and B i >The voltage change value of (ZB-Y1) is calibrated as an abnormally high value;

[0015] The determined low standard value and high standard value are transmitted to the power control determination terminal;

[0016] The power control determination end controls the charging power of a specified single battery group based on the determined abnormal change value, so that the abnormal change value meets the standard, and completes the battery charging optimization process of the entire battery group; the specific method is:

[0017] If the determined abnormal change value is an abnormally low standard value, the charging power of the corresponding single battery group is adjusted upward, and the voltage change value of the battery is confirmed in real time until the voltage change value B per unit time is reached. i Satisfaction: B i ∈[ZB-Y1, ZB+Y1], the adjustment is stopped, and the charging power after adjustment is kept unchanged, and this charging power is calibrated as the execution power;

[0018] If the determined abnormal change value is an abnormally high standard value, the charging power of the corresponding single group of batteries is adjusted downward, and the decrease value per unit time gradually increases. The voltage change value per unit time in the battery during this adjustment stage is recorded. When the next group of voltage change values ​​DB2 is lower than the previous group of voltage change values ​​DB1, the adjustment is stopped and the charging power at this moment is kept unchanged. A group of decrease difference values ​​Cz is determined by using DB1-DB2=Cz;

[0019] Integrate the decreasing values ​​that gradually increase during the downward adjustment of the charging power, confirm the decreasing value set, and identify whether there is a value of the same type as (Cz×C1) in the decreasing value set, where C1 is a preset value conversion factor:

[0020] If it exists, the charging power associated with the corresponding drop value before and after is determined, and the latter group of charging power is executed again for charging;

[0021] If it does not exist, the charging power at the corresponding moment when the adjustment is stopped remains unchanged;

[0022] Execute the adjusted charging power for a certain period, where the certain period is a preset period, and identify the voltage change value B of this single battery pack in unit time. i Satisfied: B i ∈[ZB-Y1, ZB+Y1], if it is satisfied, the charging power is kept unchanged and calibrated as the execution power. If it is not satisfied, the charging power is adjusted until the voltage change value B of this single battery pack per unit time is i Stop when satisfied and determine execution power.

[0023] Preferably, it also includes:

[0024] The power demand confirmation terminal confirms the power demand at the current moment and transmits the confirmed power demand to the output power distribution terminal;

[0025] The output power distribution end timely distributes the output power of each battery group based on the confirmed required power. The specific distribution value is based on the execution power determined by the corresponding battery during the charging process to ensure that the output power of the corresponding battery will not be too high. The specific method is:

[0026] Determine the execution power G of each battery group when the battery power is 90% i , where i represents different single battery groups, and the determined groups of execution power G i Perform ratio processing and determine the ratio sequence;

[0027] Based on the confirmed required power and the determined ratio sequence, the output power corresponding to each group of batteries is determined, and the determined output power is executed through the power execution end;

[0028] If the power level of a battery group is reduced to 0, a low power output mode is executed, and a low power signal is generated and displayed on the external display terminal. The low power output mode is a preset mode, which changes the output power of the remaining batteries to a constant value.

[0029] The present invention provides an automatic charging and discharging system for new energy bus batteries. Compared with the prior art, it has the following beneficial effects:

[0030] The present invention performs relevant confirmation on the charging voltage change value of each different single group of batteries to identify whether there is a relevant abnormality in the voltage change value, and then performs power adjustment for the determined abnormal voltage to ensure that the charging power used by each battery is different during charging, thereby ensuring that the corresponding battery will not be overcharged or overheated, and ensuring the overall charging effect of the corresponding battery;

[0031] When discharging the battery, the output power is evaluated based on the charging power used in the corresponding charging process, and then the corresponding evaluated output power is executed to ensure that each battery can be discharged normally and meet the power requirements of the corresponding bus at the same time, to ensure the overall discharge effect of the entire bus battery and achieve a better discharge processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the principle framework of the present invention;

[0033] Figure 2 Schematic diagram for determining the abnormal change value of the present invention. DETAILED DESCRIPTION

[0034] 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.

[0035] Example 1

[0036] See also Figure 1, the present application provides an automatic charging and discharging system for new energy bus batteries, including a charging and discharging control process in a charging phase and a discharging phase;

[0037] The specific execution ends in the charging stage are: a power initial control end, a value evaluation end, a power regulation determination end, a voltage monitoring end, and an execution end, wherein the voltage monitoring end is electrically connected to the input node of the power initial control end or the value evaluation end, and the power initial control end, the value evaluation end, and the power regulation determination end are electrically connected in sequence from the output node to the input node;

[0038] The specific execution ends in the discharge phase are: a demand power confirmation end, an output power allocation end, a power execution end, a voltage monitoring end and an execution end, wherein the demand power confirmation end is electrically connected to the input node of the output power allocation end, and the output power allocation end is bidirectionally connected to the power execution end, wherein the voltage monitoring end is electrically connected to the input node of the demand power confirmation end;

[0039] Among them, the voltage monitoring end monitors the voltage value of a single battery in the battery pack inside the new energy bus in real time. Its specific actuator is the corresponding voltage monitoring sensor, which is set on the positive and negative terminals of each battery cell in this battery pack;

[0040] Among them, the power initial control end preferentially uses the preset standard power to charge the single battery in the battery pack. Based on the voltage value of each single battery monitored in real time, the standard power is pre-adjusted to determine the adjustment power, so that the voltage change value per unit time of each single battery is consistent. Specifically, the use environment inside each single battery will change, which will cause the internal resistance of each single battery to be inconsistent. Therefore, in order to make the charging parameters as consistent as possible, the standard power is initially adjusted to make the charging parameters more consistent;

[0041] The specific methods of adjustment are as follows:

[0042] In a set standard power charging cycle, the voltage change values ​​of different batteries per unit time are determined, and the maximum voltage change value is selected from the determined voltage change values;

[0043] The standard power of each battery group is increased, and the voltage change value of the corresponding battery per unit time is stopped when it reaches the maximum voltage change value, and the increased standard power is calibrated as the adjusted power;

[0044] The calibrated regulated power is used as the charging power in the subsequent charging process of the corresponding single battery group;

[0045] Specifically, because the internal resistance of each battery is different, the charging power is the same during charging, but the voltage change value will be different. In order to ensure the consistency of the voltage change value and facilitate the subsequent related analysis process and power regulation process, the voltage change value is adjusted to be consistent before starting charging, so as to ensure the relevant processing effect;

[0046] For example, suppose there are three groups of batteries A, B, and C. During a charging cycle with a standard power of 100W, the voltage changes per unit time (assuming 1 minute) are:

[0047] Battery A: 0.72V;

[0048] Battery B: 0.8V;

[0049] Battery C: 1.2V;

[0050] The maximum voltage change is 1.2V (battery C).

[0051] Then, the standard power of each battery group is increased. For example, the power of battery A is gradually increased. When it is increased to 150W, the voltage change value in 1 minute reaches 1.2V. At this time, the increase is stopped and 150W is marked as the regulated power of battery A.

[0052] Similarly, the power of battery B is increased. When the power is increased to 180W, the voltage change value reaches 1.2V within 1 minute. 180W is calibrated as the regulated power of battery B.

[0053] Finally, when batteries A, B, and C are subsequently charged, the calibrated 150W, 180W, and the initial standard power of 100W are used as their respective charging powers.

[0054] In this way, a more suitable charging power can be provided for each group of batteries according to the characteristics of different batteries to optimize the charging effect and protect the batteries.

[0055] Among them, the numerical evaluation end, after determining the relevant charging power of a single battery group, performs numerical analysis on the real-time voltage monitored by each single battery group, evaluates whether there is an abnormal change value in the subsequent charging process, and transmits the existing abnormal change value to the power regulation determination end. At the beginning of the charging stage, the temperature of the battery is relatively low. As the charging time increases, due to some differences in the chemical properties of each battery, the resulting temperature changes are also different. If the temperature changes greatly, it will cause a large change in the voltage value, and the voltage will rise faster than other batteries, which is prone to overcharging. Therefore, in order to conduct real-time monitoring to ensure that each battery can be charged normally, numerical evaluation is required;

[0056] The specific methods of assessment are as follows:

[0057] Combination Figure 2 Based on the real-time monitored voltage, determine the voltage change value of the corresponding single battery per unit time and calibrate it as B i , where i represents a different single group of batteries, and its voltage change value is the difference between the voltage at the next time and the voltage at the previous time;

[0058] Identify voltage change value B i Satisfied: B i ∈[ZB-Y1, ZB+Y1], where ZB is the maximum voltage change value determined, and Y1 is the preset fluctuation value, which is prepared in advance by the operator and is generally 0.3V. If it is satisfied, the numerical evaluation can be continued. If it is not satisfied, B i The voltage change value of <(ZB-Y1) is calibrated as abnormally low value, and B i >The voltage change value of (ZB-Y1) is calibrated as an abnormally high value;

[0059] The determined low standard value and high standard value can be transmitted to the power control determination end.

[0060] The power control determination end controls the charging power of a specified single battery pack based on the determined abnormal change value, so that the abnormal change value meets the standard, and completes the battery charging optimization process of the entire battery pack. The specific method of controlling is as follows:

[0061] If the determined abnormal change value is an abnormally low standard value, the charging power of the corresponding single battery group is adjusted upward, and the voltage change value of the battery is confirmed in real time until the voltage change value B per unit time is reached. i Satisfaction: B i ∈[ZB-Y1, ZB+Y1], stop adjusting, and keep the charging power after adjustment unchanged, and mark this charging power as the execution power. This kind of situation rarely occurs, usually due to poor line contact or fault;

[0062] If the determined abnormal change value is an abnormally high standard value, the charging power of the corresponding single group of batteries will be adjusted downward, and the decrease value in each unit time will gradually increase. For example, if it decreases by 0.1 in the first unit time, it will decrease by 0.2 in the second unit time, and by 0.3 in the third unit time, and gradually increase. The voltage change value in the battery per unit time in this adjustment stage is recorded. When the next group of voltage change values ​​DB2 is lower than the previous group of voltage change values ​​DB1, the adjustment is stopped, and the charging power at this moment is kept unchanged. A group of decrease difference values ​​Cz is determined by using DB1-DB2=Cz;

[0063] Integrate the decreasing values ​​that gradually increase during the downward adjustment of the charging power, confirm the decreasing value set, and identify whether there is a value of the same type as (Cz×C1) in the decreasing value set, where C1 is a preset value conversion factor, and its specific value is prepared in advance by the operator:

[0064] If it exists, determine the charging power associated with the corresponding drop value before and after, and execute the next set of charging power again for charging (this execution power is greater than the charging power when the adjustment is stopped. The reason for reconfirmation in this way is that after the power changes, the temperature inside the battery does not change in time, and there is a change time difference. Then, after the temperature drops, the power has dropped to the specified value, but the voltage change value can be reduced in the previous charging power value, so the reduced voltage change value is not synchronized with the change of the charging power);

[0065] If it does not exist, the charging power at the corresponding moment when the adjustment is stopped remains unchanged;

[0066] Execute the adjusted charging power for a certain period, where the certain period is a preset period, generally 3 minutes or less, to identify the voltage change value B of this single battery pack in unit time. i Satisfied: B i ∈[ZB-Y1, ZB+Y1], if it is satisfied, the charging power is kept unchanged and calibrated as the execution power. If it is not satisfied, the charging power is adjusted until the voltage change value B of this single battery pack per unit time is i Stop when satisfied and determine execution power;

[0067] This charging stage is only for the charging stage when the power of a single battery group ranges from 0% to 90%. When the power of the corresponding single battery group reaches 90%, the preset standard power is used to charge the specified single battery group. The subsequent preset standard power is generally smaller. When the battery is almost fully charged, the change per unit time will be relatively small. Therefore, in order to prevent the battery from overheating, a smaller standard power is generally used for related charging.

[0068] Example 2

[0069] In the specific implementation of this embodiment, it is mainly aimed at the relevant discharge process of a corresponding single group of batteries:

[0070] The power demand confirmation terminal confirms the power demand at the current moment and transmits the confirmed power demand to the output power distribution terminal. The power demand is numerically confirmed by the control system inside the corresponding bus, such as the relevant confirmation based on the accelerator pedal amplitude. Different accelerator amplitudes require different power, and different power will generate different power demand.

[0071] The output power distribution end timely distributes the output power of each battery group based on the confirmed required power. The specific distribution value is based on the execution power determined by the corresponding battery during the charging process to ensure that the output power of the corresponding battery will not be too high. The specific method of timely distribution is:

[0072] Determine the execution power G of each battery group when the battery power is 90% i , where i represents different single battery groups, and the determined groups of execution power G i Perform ratio processing and determine the ratio sequence;

[0073] Based on the confirmed required power and the determined ratio sequence, the output power corresponding to each group of batteries is determined, and the determined output power is executed through the power execution end to ensure the normal power output of each group of batteries. For example, if the required power is 80W, and the ratio sequence of the three batteries A, B and C is 2:2.7:3.3, then the output power of the three batteries A, B and C are 20W, 27W and 33W respectively;

[0074] If the power level of a battery group is reduced to 0, the low power output mode is executed, and a low power signal is generated and displayed on the external display terminal. The low power output mode is a preset mode, which makes the output power of the remaining batteries become a constant value;

[0075] By outputting power based on the specific charging power during the charging process, the power transmission state of the bus battery can be fully guaranteed, the battery temperature can be avoided from being too high, and the reasonable discharge of the battery can be guaranteed.

[0076] Example 3

[0077] The specific implementation process of this embodiment includes the entire implementation process of the above two groups of embodiments.

[0078] Some of the data in the above formulas are dimensionless and numerically calculated. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0079] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An automatic charging and discharging system for new energy bus batteries, characterized in that: include: The voltage monitoring end monitors the voltage value of a single battery in the battery pack inside the new energy bus in real time; The power primary control end uses the preset standard power to charge the single battery in the battery pack. Based on the voltage value of each single battery group monitored in real time, the standard power is pre-adjusted to determine the adjustment power so that the voltage change value per unit time of each single battery group is consistent. The specific method is as follows: In a set standard power charging cycle, the voltage change values ​​of different batteries per unit time are determined, and the maximum voltage change value is selected from the determined voltage change values; The standard power of each battery group is increased, and the voltage change value of the corresponding battery per unit time is stopped when it reaches the maximum voltage change value, and the increased standard power is calibrated as the adjusted power; The calibrated regulated power is used as the charging power in the subsequent charging process of the corresponding single battery group; The numerical evaluation end, after determining the relevant charging power of a single battery group, performs numerical analysis on the real-time voltage monitored by each single battery group, evaluates whether there is an abnormal change value in the subsequent charging process, and transmits the existing abnormal change value to the power control determination end. The specific method is as follows: Based on the real-time monitored voltage, determine the voltage change value of the corresponding single battery per unit time and calibrate it as B i , where i represents a different single group of batteries, and its voltage change value is the difference between the voltage at the next time and the voltage at the previous time; Identify voltage change value B i Satisfied: B i ∈[ZB-Y1, ZB+Y1], where ZB is the maximum voltage change value determined, and Y1 is the preset fluctuation value. If it is satisfied, the numerical evaluation can be continued. If it is not satisfied, B i The voltage change value of <(ZB-Y1) is calibrated as abnormally low value, and B i >The voltage change value of (ZB-Y1) is calibrated as an abnormally high value; The determined low standard value and high standard value are transmitted to the power control determination terminal; The power control determination end controls the charging power of a specified single battery pack based on the determined abnormal change value, so that the abnormal change value meets the standard, and completes the battery charging optimization process of the entire battery pack. The specific method is as follows: If the determined abnormal change value is an abnormally low standard value, the charging power of the corresponding single battery group is adjusted upward, and the voltage change value of the battery is confirmed in real time until the voltage change value B per unit time is reached. i Satisfaction: B i ∈[ZB-Y1, ZB+Y1], the adjustment is stopped, and the charging power after adjustment is kept unchanged, and this charging power is calibrated as the execution power; If the determined abnormal change value is an abnormally high standard value, the charging power of the corresponding single group of batteries is adjusted downward, and the decrease value per unit time gradually increases. The voltage change value per unit time in the battery during this adjustment stage is recorded. When the next group of voltage change values ​​DB2 is lower than the previous group of voltage change values ​​DB1, the adjustment is stopped and the charging power at this moment is kept unchanged. A group of decrease difference values ​​Cz is determined by using DB1-DB2=Cz; Integrate the decreasing values ​​that gradually increase during the downward adjustment of the charging power, confirm the decreasing value set, and identify whether there is a value of the same type as (Cz×C1) in the decreasing value set, where C1 is a preset value conversion factor: If it exists, the charging power associated with the corresponding drop value before and after is determined, and the latter group of charging power is executed again for charging; If it does not exist, the charging power at the corresponding moment when the adjustment is stopped remains unchanged; Execute the adjusted charging power for a certain period, where the certain period is a preset period, and identify the voltage change value B of this single battery pack in unit time. i Satisfied: B i ∈[ZB-Y1, ZB+Y1], if it is satisfied, the charging power is kept unchanged and calibrated as the execution power. If it is not satisfied, the charging power is adjusted until the voltage change value B of this single battery pack per unit time is i Stop when satisfied and determine execution power.

2. The automatic charging and discharging system for new energy bus batteries according to claim 1 is characterized in that: Also includes: The power demand confirmation terminal confirms the power demand at the current moment and transmits the confirmed power demand to the output power distribution terminal; The output power distribution end timely distributes the output power of each battery group based on the confirmed required power. The specific distribution value is based on the execution power determined by the corresponding battery during the charging process to ensure that the output power of the corresponding battery is not too high.

3. The automatic charging and discharging system for new energy bus batteries according to claim 2 is characterized in that: The specific method of timely distributing the output power of each battery group at the output power distribution end is: Determine the execution power G of each battery group when the battery power is 90% i , where i represents different single battery groups, and the determined groups of execution power G i Perform ratio processing and determine the ratio sequence; Based on the confirmed required power and the determined ratio sequence, the output power corresponding to each group of batteries is determined, and the determined output power is executed through the power execution end; If the power level of a battery group is reduced to 0, a low power output mode is executed, and a low power signal is generated and displayed on the external display terminal. The low power output mode is a preset mode, which changes the output power of the remaining batteries to a constant value.

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