Heterogeneous compatible system based on power battery

Abstract

The embodiments of the present disclosure provide a heterogeneous compatible system based on power batteries, comprising: a plurality of power battery units; an energy management unit configured to compare a distribution difference value of output voltages of the plurality of power battery units with a distribution difference value of output power / voltages, and select a power output mode corresponding to one of the output voltages and the output power / voltages with a smaller distribution difference value; generate a control signal corresponding to the selected power output mode; and a conversion unit configured to adjust, in response to the control signal, the output voltage of each power battery via the conversion unit to be the same, or adjust the output power / voltage of each power battery via the conversion unit to be the same. Through the cooperative work of the energy management unit and the conversion unit, power batteries of different specifications and material types are compatible and integrated for use, and energy is provided for the system, thereby maximizing the use of resources.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of new energy, and in particular to a heterogeneous compatible system based on power batteries. BACKGROUND

[0002] New energy batteries are increasingly widely used. In some scenarios, new energy batteries of different specifications may be used for power supply together. However, due to different materials, different specifications and / or different depreciation degrees of new energy batteries of different specifications, the inconsistency of battery output affects the overall performance and stability of the system, making it difficult to compatibly manage and optimize the collaborative work of multiple types of new energy batteries. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present disclosure is to provide a heterogeneous compatible system based on power batteries to solve the problems in the related art.

[0004] The first aspect of the present disclosure provides a heterogeneous compatible system based on power batteries, comprising:

[0005] a plurality of power battery units having a plurality of battery types, different battery types having different battery information; the battery information includes output voltage and output power / voltage;

[0006] an energy management unit communicatively connected to each of the power battery units to obtain the battery information of each power battery unit, configured to compare the distribution difference value of the output voltage with the distribution difference value of the output power / voltage of the plurality of power battery units, and select the power output mode corresponding to the smaller distribution difference value between the output voltage and the output power / voltage; generate a control signal corresponding to the selected power output mode;

[0007] a plurality of conversion units, each of which is electrically coupled to each of the power battery units at the input end and is coupled to a bus at the output end, each of which is communicatively coupled to the energy management unit to obtain the control signal, for adjusting the output voltage of each power battery through the conversion unit to be the same in response to the power output mode corresponding to the output voltage of the control signal; or adjusting the output power / voltage of each power battery through the conversion unit to be the same in response to the power output mode corresponding to the output power / voltage of the control signal.

[0008] In an embodiment of the first aspect, each of the conversion units comprises a DC-DC converter connected to a DC bus, and the plurality of DC-DC converters adjust the output voltage of each other on the AC bus to be the same or adjust the output power / voltage to be the same.

[0009] In an embodiment of the first aspect, each of the conversion units includes a DC-DC converter and an energy storage inverter, the energy storage inverter is connected to an AC bus, and the multiple energy storage inverters adjust their output voltages on the AC bus to be the same or adjust their output power / voltage to be the same.

[0010] In an embodiment of the first aspect, the control signal generation includes:

[0011] Calculating the average power / voltage of the output power / voltage of each of the conversion units;

[0012] Calculating a difference between the output power / voltage of each conversion unit and the average power / voltage;

[0013] When the difference is a positive value, generating the control signal to control the corresponding power battery unit to be in a discharging state;

[0014] When the difference is a negative value, the control signal is generated to control the corresponding power battery unit to be in a charging state.

[0015] In an embodiment of the first aspect, the control signal generation includes:

[0016] Calculating the average power / voltage of the output power / voltage of each of the conversion units;

[0017] Calculating a difference between the output power / voltage of each conversion unit and the average power / voltage;

[0018] Based on the goal of eliminating the difference, the charge / discharge rate of the corresponding power battery unit is obtained in combination with the time length from the current moment to the corresponding moment of the next cycle, so that the output voltage or output power of the corresponding conversion units at the corresponding moment of the next preset cycle under the charge / discharge rate tends to be the same; wherein the average rate is included in the control signal output to the conversion unit of the corresponding power battery unit.

[0019] In an embodiment of the first aspect, the energy management unit includes:

[0020] A battery information collection module, used to collect battery information of each power battery unit;

[0021] an output selection module, communicatively connected to the battery acquisition module, and configured to select a power output mode corresponding to the smaller output voltage or output power / voltage distribution difference value based on a comparison result of the output voltage distribution difference value and the output power / voltage distribution difference value of the plurality of power battery cells;

[0022] The control signal generation module is communicatively connected to the battery information collection module and the output selection module, and generates the control signal based on the corresponding power output mode according to the battery information, so as to control the duty cycle of the conversion unit, thereby adjusting the output voltage or output power of the conversion unit.

[0023] The signal output module is coupled to the control signal generation module and the conversion unit, and is configured to output the control signal.

[0024] In an embodiment of the first aspect, the energy management unit further comprises an energy distribution module coupled to the external load, configured to adjust the control signal according to the external load information and the battery information, so that the output voltage or output power of the power battery via the conversion unit meets the working power or working voltage of the external load.

[0025] In an embodiment of the first aspect, the energy management unit further comprises:

[0026] The monitoring unit is coupled to the power battery unit, and is configured to monitor the working state of the power battery unit in real time.

[0027] The prompt unit is coupled to the monitoring unit, and is configured to display the working state.

[0028] In an embodiment of the first aspect, the power battery unit comprises at least one of the following: a retired battery; a brand-new battery.

[0029] In an embodiment of the first aspect, a protection unit is further arranged between the power battery unit and the conversion unit, configured to protect the power battery unit and the external load.

[0030] The energy management unit and the conversion unit work together to realize the compatible use of power batteries of different specifications and material types, and provide energy for the system together, thereby maximizing the use of resources. At the same time, through the cooperative work of the energy management unit and the conversion unit, the system can dynamically adjust the output voltage or output power of each battery unit according to the actual demand. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A structure block diagram of a heterogeneous compatible system based on power batteries in an embodiment of the present disclosure is shown.

[0032] Figure 2 A structure block diagram of an energy management unit in a heterogeneous compatible system based on power batteries in an embodiment of the present disclosure is shown.

[0033] Figure 3 A flowchart of control signal generation in a heterogeneous compatible system based on power batteries in an embodiment of the present disclosure is shown.

[0034] Figure 4 A flowchart illustrating a process of generating a control signal in a heterogeneous compatible system based on a power battery in another embodiment of the present disclosure is shown.

[0035] Figure 5 A structure block diagram of an energy management unit in a heterogeneous compatible system based on a power battery in another embodiment of the present disclosure is shown.

[0036] Figure 6 A structure block diagram of a conversion unit including a DC-DC converter in a heterogeneous compatible system based on a power battery in an embodiment of the present disclosure is shown.

[0037] Figure 7 A structure block diagram of a conversion unit including a DC-DC converter and an energy storage inverter in a heterogeneous compatible system based on a power battery in an embodiment of the present disclosure is shown.

[0038] Figure 8 A structure block diagram of a heterogeneous compatible system based on a power battery in another embodiment of the present disclosure is shown.

[0039] Figure 9 A structure block diagram of a heterogeneous compatible system based on a power battery in another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0040] The embodiments of the present disclosure will be described in detail by specific examples as follows, and other advantages and effects of the present disclosure can be easily understood by those skilled in the art from the disclosed messages. The present disclosure can also be implemented or applied by other different embodiments or modules, and various modifications or changes can be made to the details of the present disclosure without departing from the spirit of the present disclosure according to different views and modules. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0041] The embodiments of the present disclosure will be described in detail by specific examples as follows, and other advantages and effects of the present disclosure can be easily understood by those skilled in the art from the disclosed messages. The present disclosure can also be implemented or applied by other different embodiments or modules, and various modifications or changes can be made to the details of the present disclosure without departing from the spirit of the present disclosure according to different views and modules. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0042] In the description of the present disclosure, the expressions "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. mean that the particular feature, structure, material or characteristic following the expressions are included in at least one embodiment or example of the present disclosure. Also, the expressions can include a particular feature, structure, material or characteristic in combination with one or more of the other features, structures, materials or characteristics in any one or more embodiments or examples. In addition, the different embodiments or examples of the present disclosure and the features of the different embodiments or examples can be combined and combined with each other, if not mutually exclusive.

[0043] In addition, the terms "first", "second", etc. are used only to indicate a purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a group" is two or more, unless specifically limited.

[0044] In order to clearly illustrate the present disclosure, devices irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar constituent elements throughout the description.

[0045] Throughout the description, when it is said that a device is "connected" to another device, it includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are placed therebetween. In addition, when it is said that a device "includes" a certain constituent element, unless specifically stated to the contrary, other constituent elements are not excluded, but it means that other constituent elements can also be included.

[0046] Although the terms first, second, etc. are used herein to refer to various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", mean the presence of the stated features, steps, operations, elements, modules, items, kinds and / or groups, but do not exclude the presence or addition of one or more other features, steps, operations, elements, modules, items, kinds and / or groups. The terms "or" and "and / or" as used herein are to be interpreted as inclusive, or meaning either or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". This definition applies only when a combination of elements, functions, steps or operations are in some way specifically called out in a claim.

[0047] The professional terms used herein are used only to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein, unless the context clearly indicates otherwise, also includes the plural form. In the specification, the meaning of "include" is to embody the specific features, regions, integers, steps, operations, elements, and / or components, and does not exclude the presence or addition of other features, regions, integers, steps, operations, elements, and / or components.

[0048] Although not differently defined, the technical terms and scientific terms used herein include the technical terms and scientific terms commonly used in the art to which the present disclosure belongs, and all terms have the same meaning as generally understood by those skilled in the art. The terms defined in a commonly used dictionary are additionally explained to have a meaning consistent with the related technical literature and the currently prompted message, unless defined, and should not be over-interpreted as ideal or very formal meanings.

[0049] New energy batteries are increasingly widely used. In some scenarios, new energy batteries of different specifications may be used for power supply together. However, since new energy batteries of different specifications may come from different devices and manufacturers, have different chemical compositions, capacities, and rated voltages. Such diversity leads to inconsistency of battery output, affecting the overall performance and stability of the system, making it difficult to compatibly manage and optimize the collaborative work of multiple types of new energy batteries.

[0050] With the popularity of electric vehicles and hybrid electric vehicles, considering that the sales volume of the whole vehicle manufacturer is not as expected due to model iteration, in addition to the self-provided vehicle-mounted battery, the new energy vehicle also has spare battery packs, inventory battery packs, etc. These battery packs need special storage and need professional personnel to maintain and charge, which is an additional cost for the host manufacturer. Since the price of these battery packs is not cheap when purchased, if they are sold at a discount, there will be a large loss, which is not worth the cost. In addition, there are some waste power batteries removed from vehicles that are no longer suitable for continued use in vehicles, but still have a certain residual capacity and service life and can be used in other application scenarios. In the embodiments of the present application, the above retired batteries (including spare batteries, inventory batteries, and waste batteries, etc.) can be applied to energy storage systems, and of course, new battery packs can also be used.

[0051] However, due to the above power batteries, which may be different in material, from different car brands and models, and / or different in depreciation, etc., the battery output (such as output voltage, output current, output power, etc.) is inconsistent, such as when the output voltage of each battery unit is inconsistent, it will cause additional voltage drop in the transmission process of the current, thereby increasing the energy loss. For example, when the output voltage of each battery unit is inconsistent, it may cause some battery units to be overloaded and other battery units to be lightly loaded. This imbalance will lead to uneven energy distribution and increase the overall energy consumption of the system.

[0052] To solve the above problems, therefore, in the present disclosure, a heterogeneous compatible system compatible with different types of power batteries is provided, which can dynamically adjust the output voltage or output power of each battery unit according to the actual demand, thereby solving the consistency problem of various types of power batteries.

[0053] Figure 1 The structure block diagram of the heterogeneous compatible system based on power batteries in an embodiment of the present disclosure is shown.

[0054] The heterogeneous compatible system of the power battery includes a plurality of power battery units 100, an energy management unit 200, and a plurality of conversion units 300.

[0055] Among them, the plurality of power battery units 100 have a plurality of battery types, and different battery types have different battery information; the battery information includes output voltage and output power / voltage.

[0056] Specifically, these power battery units 100 may be from different car brands and models, have different chemical composition, capacity and rated voltage. It can include various types of batteries such as lithium-ion batteries, nickel-hydrogen batteries, etc.

[0057] Optionally, the power battery unit 100 includes at least one of the following: retired battery; brand new battery. For example: different sources of retired batteries may be from different car brands and models, have different chemical composition, capacity and rated voltage. For example, it can include batteries retired from electric cars, electric buses and other electric vehicles. Even if the batteries of the same brand, due to the difference in production time and process, the performance of different batches of batteries may also differ. The on-board battery directly comes from the electric car or other electric vehicle in use, has higher performance and consistency. Among them, the material type of the battery in the battery unit can be one or more of ternary lithium battery, iron lithium battery, sodium ion battery, lead-acid battery, solid-state battery, etc.

[0058] The energy management unit 200 is communicatively connected to each of the power battery units 100 to obtain battery information of each power battery unit 100, configured to compare a distribution difference value of output voltage with a distribution difference value of output power / voltage of the plurality of power battery units 100, and select a power output mode corresponding to the one with smaller distribution difference value; and generate a control signal corresponding to the selected power output mode.

[0059] Specifically, in some embodiments, by comparing the distribution difference values of output voltage and output power / voltage, the one with smaller distribution difference value is selected for adjustment, which can reduce the difficulty and complexity of adjustment. For example, if the distribution difference value of output voltage is smaller, it is easier to adjust the voltage than the power to achieve consistency. Selecting the one with smaller distribution difference value for adjustment can achieve the output consistency of each battery unit in a shorter time, thereby achieving the goal of system optimization faster.

[0060] Optionally, if the distribution difference value of output voltage is smaller, it means that the output voltages of the battery units are more consistent. In this case, selecting the voltage-priority power output mode can avoid the system instability phenomenon caused by voltage difference, such as overvoltage or undervoltage problem, thereby improving the overall stability of the system. If the distribution difference value of output power / voltage is smaller, it means that the output power / voltage of each battery unit is more consistent. In this case, selecting the power-priority power output mode can achieve load balancing and avoid overloading or light loading of individual battery units, thereby improving the overall stability of the system.

[0061] By adjusting the output voltage and power, it ensures that each battery unit works under similar conditions, avoids premature aging of individual battery units due to overloading or overheating, thereby prolonging the service life of the entire system. The consistency of voltage and power can reduce the stress difference between battery units, avoid battery damage caused by local overheating or overloading, and prolong the service life of the battery.

[0062] Optionally, in Figure 2 In an example, the energy management unit 200 includes a battery information acquisition module 201, an output selection module 202, a control signal generation module 203, and a signal output module 204.

[0063] The battery information acquisition module 201 is used to acquire the battery information of each power battery unit 100. The battery information acquisition module 201 acquires the output voltage and output power / voltage information of each power battery unit 100 in real time through a communication interface (such as CAN bus, MODBUS, etc.).

[0064] The output selection module 202 is communicatively connected to the battery collection module and is configured to select a power output mode corresponding to the output voltage or the output power / voltage with a smaller distribution difference value according to a comparison result of the distribution difference value of the output voltage and the distribution difference value of the output power / voltage of the plurality of power battery units 100. The distribution difference value can be calculated by standard deviation or other statistical methods. Wherein, the smaller one is selected as a reference index to determine which distribution of the output voltage or the output power / voltage is more uniform. For example, assuming that the distribution difference value of the output voltage is 0.5V and the distribution difference value of the output power / voltage is 10W, the output selection module 202 selects the power output mode of the output voltage.

[0065] The control signal generation module 203 is respectively communicatively connected to the battery information collection module 201 and the output selection module 202, and generates the control signal to control the duty cycle of the conversion unit 300 according to the battery information based on the corresponding power output mode, so as to adjust the output voltage or the output power via the conversion unit 300.

[0066] Specifically, if the power output mode of the output voltage is selected, the control signal generation module 203 generates a control signal for adjusting the output voltage of the conversion unit 300; if the power output mode of the output power / voltage is selected, the control signal generation module 203 generates a control signal for adjusting the output power / voltage of the conversion unit 300.

[0067] The conversion unit 300 controls the output voltage or the output power by adjusting the duty cycle of the switching device. The duty cycle refers to the ratio of the time when the switching device is in the on state to the whole cycle time in a cycle. Wherein, by increasing the duty cycle, the output voltage will also increase accordingly; vice versa. Therefore, by adjusting the duty cycle, the level of the output voltage can be accurately controlled. For the output power / voltage, when the load condition is unchanged, increasing the duty cycle will cause the output voltage to increase, and in turn may cause the output power / voltage to increase (provided that the load can absorb more power). Conversely, reducing the duty cycle will reduce the output voltage, thereby reducing the output power / voltage.

[0068] Optionally, in the power supply system 100, Figure 3 In an example, the control signal generation includes:

[0069] Step S11, calculating the average power / voltage of the output power / voltage of each conversion unit 300.

[0070] Step S21, calculating the difference value of the output power / voltage of each conversion unit 300 minus the average power / voltage.

[0071] Step S311, when the difference value is positive, the control signal is generated to control the corresponding power battery unit 100 to be in a discharging state.

[0072] Step S312, when the difference value is negative, the control signal is generated to control the corresponding power battery unit 100 to be in a charging state.

[0073] Specifically, in some embodiments, when the difference value is positive, it means that the output power / voltage of the power battery unit 100 is higher than the average power / voltage, and the output power / voltage needs to be reduced. This can be achieved by reducing the duty cycle of the conversion unit 300, thereby reducing the output voltage. Therefore, the control signal is generated to control the power battery unit 100 to be in a discharging state, thereby reducing the output power / voltage. Similarly, it can be achieved by increasing the duty cycle of the conversion unit 300, thereby increasing the output voltage. When the difference value is negative, it means that the output power / voltage of the power battery unit 100 is lower than the average power / voltage, and the output power / voltage needs to be increased. Therefore, the control signal is generated to control the power battery unit 100 to be in a charging state, thereby increasing the output power / voltage.

[0074] Wherein, the average power / voltage is used as a reference value to evaluate whether the output power / voltage of each power battery unit 100 is too high or too low. By comparing with the average power / voltage, the relative output state of each battery unit can be determined. By adjusting the output power / voltage of each power battery unit 100 to approach the average power / voltage, load balancing is achieved. For example, when the output power / voltage of a certain battery unit is higher than the average power / voltage, its output power / voltage is reduced by discharging; when the output power / voltage of a certain battery unit is lower than the average power / voltage, its output power / voltage is increased by charging. Finally, the output power / voltage of all battery units will tend to the average value.

[0075] Optionally, in Figure 4 In an example, the control signal can also be generated by the following way, comprising:

[0076] Step S12, calculate the average power / voltage of the output power / voltage of each conversion unit 300.

[0077] Step S22, calculate the difference value of the output power / voltage of each conversion unit 300 minus the average power / voltage.

[0078] Step S32, based on eliminating the difference as the target, combining the duration from the current time to the corresponding time of the next period to obtain the charging / discharging rate of the corresponding power battery unit 100, so that the output voltage or output power between the corresponding conversion units 300 can tend to be the same at the corresponding time of the next preset period under the charging / discharging rate.

[0079] Specifically, compared with adjusting the output power / voltage by simply discharging or charging in another embodiment, the embodiment realizes dynamic adjustment by calculating the average rate, which can more smoothly transition to the target output state and reduce the impact caused by mutation.

[0080] Wherein, for each power battery unit 100, the difference between its current output power / voltage (P1) and the target output (P2) is calculated: if (P1>P2), the difference is positive, indicating that the output power / voltage of the unit is higher than the target value and needs to be reduced. If (P1

[0081] A preset period is set, which refers to the time interval from the current time to the next adjustment point. This duration can be set according to the response speed of the system and the requirements of the application scenario. The average rate refers to the speed at which each power battery unit 100 needs to adjust the output power / voltage within the preset period. The calculated average rate is included in the control signal. After each conversion unit 300 receives the control signal, it will adjust its output according to the average rate. If it is positive, the conversion unit 300 will gradually reduce the output power / voltage; if the average rate is negative, the conversion unit 300 will gradually increase the output power / voltage. The adjustment of the conversion unit 300 is continuous, rather than all at once. This can avoid drastic changes in output, reduce the impact on the system, and improve the stability and reliability of the system.

[0082] The signal output module 204 is coupled to the control signal generation module 203 and the conversion unit 300, and is used to output the control signal.

[0083] Optionally, in Figure 5 In an embodiment, the energy management unit 200 further includes an energy distribution module 205 coupled to an external load, for adjusting the control signal according to external load information and the battery information, so that the output voltage or output power of the power battery via the conversion unit 300 meets the working power or working voltage of the external load.

[0084] Specifically, the energy distribution module 205 collects the working voltage and working power information of the external load in real time through a communication interface (such as CAN bus, MODBUS, etc.). These information includes but not limited to the rated voltage, rated power, current working state of the load, etc. The energy distribution module 205 calculates the total output power / voltage and total output voltage required at present according to the working voltage and working power information of the external load. For each power battery unit 100, the difference between its current output power / voltage and the power required by the load is calculated. The calculated average rate is included in the control signal and output to the conversion unit 300 of the corresponding power battery unit 100. The conversion unit 300 adjusts its duty cycle according to this average rate, so as to gradually adjust the output voltage or output power in the next preset period, so as to meet the load demand.

[0085] In Figure 1 In an embodiment, the input end of each of the plurality of conversion units 300 is electrically coupled to each of the power battery units 100, and the output end is coupled to a busbar 400. Each conversion unit 300 is communicatively coupled to the energy management unit 200 to obtain the control signal. In response to the power supply output mode corresponding to the output voltage of the control signal, the output voltage of each power battery through the conversion unit 300 is adjusted to be the same; or, in response to the power supply output mode corresponding to the output power / voltage of the control signal, the output power / voltage of each power battery through the conversion unit 300 is adjusted to be the same.

[0086] Specifically, when the control signal indicates the power supply output mode of the output voltage, the conversion unit 300 adjusts the output voltage by adjusting the duty cycle, so as to make it consistent. Specifically, if the output voltage of a certain battery unit is higher than the target value, the conversion unit 300 will reduce the duty cycle to reduce the output voltage; if the output voltage is lower than the target value, the conversion unit 300 will increase the duty cycle to increase the output voltage. Similarly, when the control signal indicates the power supply output mode of the output power / voltage, the conversion unit 300 adjusts the output power / voltage by adjusting the duty cycle, so as to make it consistent. Specifically, if the output power / voltage of a certain battery unit is higher than the target value, the conversion unit 300 will reduce the duty cycle to reduce the output power / voltage; if the output power / voltage is lower than the target value, the conversion unit 300 will increase the duty cycle to increase the output power / voltage. In this way, each conversion unit 300 can dynamically adjust its output according to the control signal, to ensure that the output voltage or output power of all power battery units 100 tends to be the same, thereby realizing the balance and stability of the system.

[0087] Optionally, in Figure 6In an example, each of the conversion units 300 comprises a DC-DC converter 301 connected to the DC bus 401, and the plurality of DC-DC converters 301 adjust the output voltage on the AC bus 402 to be the same or adjust the output power / voltage to be the same.

[0088] In particular, if the control signal indicates the output voltage power supply output mode, the DC-DC converter 301 adjusts the output voltage by adjusting the duty cycle to be the same on the AC bus 402. Specifically, by increasing or decreasing the duty cycle, the output voltage can be increased or decreased. If the control signal indicates the output power / voltage power supply output mode, the DC-DC converter 301 adjusts the output power / voltage by adjusting the duty cycle to be the same on the AC bus 402. Specifically, by increasing or decreasing the duty cycle, the output power / voltage can be increased or decreased.

[0089] The main function of the DC-DC converter 301 is to convert the DC power of the battery unit 100 into a DC power suitable for the DC bus 401.

[0090] Optionally, in Figure 7 In an example, each of the conversion units 300 comprises a DC-DC converter 301 and an energy storage inverter 302 connected to the AC bus 402, and the plurality of energy storage inverters 302 adjust the output voltage on the AC bus 402 to be the same or adjust the output power / voltage to be the same.

[0091] In particular, the DC-DC converter 301 is connected to the DC bus 401 and is responsible for converting the DC power of the battery unit into a DC power suitable for the DC bus 401. The energy storage inverter 302 then converts the DC power on the DC bus 401 into AC power suitable for the AC bus 402. The DC-DC converter 301 is connected to the DC bus 401 and then connected to the AC bus 402 through the inverter (if any), and the adjustment of the output mainly occurs on the DC side.

[0092] Optionally, in Figure 8 In an example, the heterogeneous compatible system based on the power battery further comprises:

[0093] A monitoring unit 600 coupled to the power battery unit 100 for real-time monitoring of the working state of the power battery unit 100;

[0094] A prompt unit 700 coupled to the monitoring unit 600 for displaying the working state.

[0095] Specifically, in some embodiments, the monitoring unit 600 monitors the working status of each power battery cell 100 in real time through the communication interface, including output voltage, output power / voltage, temperature, current, etc. The prompting unit 700 is connected with the monitoring unit 600 through the communication interface, receives the working status information provided by the monitoring unit 600, and displays these information intuitively. If the monitoring unit 600 detects any abnormal condition (such as overvoltage, overcurrent, high temperature, etc.), the prompting unit 700 will immediately issue an alarm to remind the user or system administrator to take appropriate measures.

[0096] Optionally, in Figure 9 In the example, a protection unit 800 is further arranged between the power battery cell 100 and the conversion unit 300, for protecting the power battery cell 100 and the external load.

[0097] Specifically, in some embodiments, the working status of the battery cell is monitored, such as voltage, current, temperature, etc., and when an abnormal condition (such as overcharge, overdischarge, short circuit, overtemperature, etc.) is detected, the protection unit 800 can quickly cut off the circuit to prevent the spread of faults and protect the battery cell and the external load from damage. The protection unit 800 can include but is not limited to overcurrent protection circuit, overvoltage protection circuit, undervoltage protection circuit, temperature protection circuit, etc.

[0098] The above embodiments are only illustrative of the principles of the present disclosure and its effectiveness, and are not intended to limit the present disclosure. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A heterogeneous compatible system based on traction batteries, characterized in that, The application comprises: a plurality of power battery units with a plurality of battery types, different battery types having different battery information; the battery information includes output voltage and output power / voltage; an energy management unit communicatively connected to each of the power battery units to obtain the battery information of each power battery unit, configured to compare the distribution difference value of the output voltage of the plurality of power battery units with the distribution difference value of the output power / voltage, and select the power output mode corresponding to the one with the smaller distribution difference value among the output voltage and the output power / voltage; generate a control signal corresponding to the selected power output mode; a plurality of conversion units, each of which is electrically connected to each of the power battery units at the input end and is connected to a bus at the output end, each of which is communicatively connected to the energy management unit to obtain the control signal, for adjusting the output voltage of each power battery through the conversion unit to be the same in response to the power output mode corresponding to the output voltage of the control signal, or adjusting the output power / voltage of each power battery through the conversion unit to be the same in response to the power output mode corresponding to the output power / voltage of the control signal; the control signal generation comprises: calculating the average power / voltage of the output power / voltage of each of the conversion units; calculating the difference value of the output power / voltage of each conversion unit minus the average power / voltage; when the difference value is positive, generating the control signal to control the corresponding power battery unit to be in a discharging state; when the difference value is negative, generating the control signal to control the corresponding power battery unit to be in a charging state; wherein, based on eliminating the difference value as the target, the charging / discharging rate of the corresponding power battery unit is obtained in combination with the time length from the current time to the corresponding time of the next period, so that the output voltage or output power between the corresponding conversion units can tend to be the same at the corresponding time of the next preset period under the charging / discharging rate.

2. The heterogeneous compatible system of claim 1, wherein, Each of the conversion units comprises a DC-DC converter connected to a DC bus, and the plurality of DC-DC converters adjust the output voltage of each other on the AC bus to be the same or adjust the output power / voltage to be the same.

3. The heterogeneous compatible system of claim 1, wherein, Each of the conversion units comprises a DC-DC converter and an energy storage inverter, the energy storage inverter is connected to an AC bus, and the plurality of energy storage inverters adjust the output voltage of each other on the AC bus to be the same or adjust the output power / voltage to be the same.

4. The heterogeneous compatible system of claim 1, wherein, The energy management unit comprises: a battery information acquisition module for acquiring the battery information of each of the power battery units; an output selection module communicatively connected to the battery information acquisition module, configured to compare the distribution difference value of the output voltage of the plurality of power battery units with the distribution difference value of the output power / voltage, and select the power output mode corresponding to the one with the smaller distribution difference value among the output voltage and the output power / voltage; The control signal generation module is communicatively connected with the battery information collection module and the output selection module, and generates the control signal based on the corresponding power output mode and the battery information to control the duty cycle of the conversion unit, so as to adjust the output voltage or output power of the conversion unit. The signal output module is coupled with the control signal generation module and the conversion unit, and is configured to output the control signal.

5. The heterogeneous compatible system of claim 1, wherein, The energy management unit further comprises an energy distribution module coupled with the external load, which is configured to adjust the control signal based on the external load information and the battery information, so that the output voltage or output power of the power battery via the conversion unit meets the working power or working voltage of the external load.

6. The heterogeneous compatible system of claim 1, wherein, Further comprising: A monitoring unit coupled with the power battery unit, which is configured to monitor the working state of the power battery unit in real time. A prompt unit coupled with the monitoring unit, which is configured to display the working state.

7. The heterogeneous compatible system of claim 1, wherein, The power battery unit comprises at least one of the following: retired battery; brand new battery.

8. The heterogeneous compatible system of claim 1, wherein, A protection unit is further arranged between the power battery unit and the conversion unit to protect the power battery unit and the external load.

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