Heterogeneous compatible system based on power battery

Abstract

The embodiment of the invention provides a heterogeneous compatible system based on a power battery. The heterogeneous compatible system comprises a plurality of power battery units; the energy management unit is configured to select a power supply output mode corresponding to the output voltage and one with the smaller distribution difference value in the output power / voltage according to a comparison result of the distribution difference value of the output voltage of the plurality of power battery units and the distribution difference value of the output power / voltage; generating a control signal corresponding to the selected power supply output mode; the conversion unit is used for adjusting the output voltage of each power battery passing through the conversion unit to tend to be the same in response to a power supply output mode of the corresponding output voltage of the control signal; or adjusting the output power / voltage of each power battery passing through the conversion unit to be the same. Through cooperative work of the energy management unit and the conversion unit, power batteries of different specifications and material types are compatible, integrated and used and jointly provide energy for the system, and maximum utilization of resources is achieved.

Description

Technical Field

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

[0002] New energy batteries are increasingly being used. In some scenarios, new energy batteries of different specifications may be used to provide power together. However, due to the different materials, specifications, and / or depreciation of new energy batteries of different specifications, the output of the batteries is inconsistent, which affects the overall performance and stability of the system, making it difficult to manage and optimize the coordinated work of multiple types of new energy batteries. Summary of the invention

[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 a power battery, which includes:

[0005] A plurality of power battery units having a plurality of battery types, and 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 battery information of each of the power battery units, and configured to select a power output mode corresponding to the smaller distribution difference value of the output voltage and the output power / voltage according to a comparison result of 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 generate a control signal corresponding to the selected power output mode;

[0007] A plurality of conversion units, wherein the input ends are electrically coupled to each of the power battery units one by one, and the output ends are coupled to a bus, and each conversion unit is communicatively coupled to the energy management unit to obtain the control signal, and is used for adjusting the output voltage of each power battery through the conversion unit to be the same in response to the power output mode of the output voltage corresponding to 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 of the output power / voltage corresponding to the control signal.

[0008] In an embodiment of the first aspect, each of the conversion units includes a DC-DC converter, which is connected to a DC bus, and the multiple DC-DC converters adjust their output voltages on the AC bus to be the same or adjust their output powers / voltages 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 powers / voltages to be the same.

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

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

[0012] Calculate the 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 comprises:

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

[0017] Calculate the 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 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 at 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 of the power battery units;

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

[0022] a control signal generating module, which is communicatively connected to the battery information collecting module and the output selecting module respectively, and generates the control signal according to the battery information based on the corresponding power output mode to control the duty cycle of the conversion unit, thereby adjusting the output voltage or output power through the conversion unit;

[0023] The signal output module is coupled to the control signal generating module and the conversion unit, and is used for outputting the control signal.

[0024] In an embodiment of the first aspect, the energy management unit also includes an energy distribution module, 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 meets the operating power or operating voltage of the external load.

[0025] In an embodiment of the first aspect, further comprising:

[0026] a monitoring unit, coupled to the power battery units respectively, for monitoring the working status of the power battery units in real time;

[0027] A prompt unit is coupled to the monitoring unit and is used to display the working status.

[0028] In an embodiment of the first aspect, the power battery unit includes 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 provided between the power battery unit and the conversion unit for protecting the power battery unit and an external load.

[0030] The beneficial effects of the present disclosure are as follows: through the coordinated work of the energy management unit and the conversion unit, power batteries of different specifications and material types can be compatible and integrated for use, and together provide energy for the system, thus maximizing the utilization of resources. At the same time, through the coordinated 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 actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0034] Figure 4 A schematic diagram of a flow chart showing control signal generation in a heterogeneous compatible system based on power batteries in another embodiment of the present disclosure is shown.

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

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

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

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

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

[0040] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. 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 following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0042] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0044] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0045] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0046] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one 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". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0047] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0048] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0049] New energy batteries are increasingly being used. In some scenarios, new energy batteries of different specifications may be used to supply power together. However, new energy batteries of different specifications may come from different devices and manufacturers, with different chemical compositions, capacities, and rated voltages. This diversity leads to inconsistent battery output, affecting the overall performance and stability of the system, and 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 vehicles, considering that the sales volume of vehicle OEMs is not as much as expected due to the iteration of vehicle models, new energy vehicles will have spare battery packs, inventory battery packs, etc. in addition to their own on-board batteries. These battery packs require specific storage, and professional personnel are required to do maintenance and recharging, which is an additional cost for the OEM. Since these battery packs are not cheap when purchased, if they are sold at a depreciation, there will be a large loss, which is not worth the loss. In addition, there are some waste power batteries removed from the vehicle, which are no longer suitable for use in the car, but still have a certain remaining capacity and service life, and can be used in other application scenarios. In the embodiment of the present application, the above retired batteries (including spare batteries, inventory batteries and waste batteries, etc.) can be applied to the energy storage system, and of course, new battery packs can also be used.

[0051] However, the above power batteries may have different materials, specifications and / or depreciation due to different car brands and models, which may lead to inconsistency in battery output (such as output voltage, output current, output power, etc.). For example, when the output voltages of the battery cells are inconsistent, it will cause additional voltage drops during the transmission of the current, thereby increasing energy loss. For another example, when the output voltages of the battery cells are inconsistent, some battery cells may be overloaded while other battery cells are lightly loaded. This imbalance will lead to uneven energy distribution and increase the overall energy consumption of the system.

[0052] In order to solve the above problems, the present disclosure provides a heterogeneous compatible system that is compatible with different types of power batteries. The system can dynamically adjust the output voltage or output power of each battery cell according to actual needs, thereby solving the consistency problem of various types of power batteries.

[0053] Figure 1 A structural block diagram of a heterogeneous compatible system based on a power battery in one 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] 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 cells 100 may come from different car brands and models, have different chemical compositions, capacities, and rated voltages, and may include various types of batteries such as lithium-ion batteries and nickel-metal hydride batteries.

[0057] Optionally, the power battery unit 100 includes at least one of the following: retired batteries; new batteries. For example, retired batteries from different sources may come from different car brands and models, and have different chemical compositions, capacities, and rated voltages. For example, batteries retired from electric vehicles, electric buses, and other electric vehicles may be included. Even for batteries of the same brand, the performance of different batches may vary due to differences in production time and process. The on-board battery comes directly from electric vehicles or other electric vehicles in use, and has higher performance and consistency. Among them, the material type of the battery in the battery unit can be one or more of a ternary lithium battery, an iron-lithium battery, a sodium-ion battery, a lead-acid battery, a solid-state battery, and the like.

[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, and is configured to select a power output mode corresponding to the output voltage and the output power / voltage with a smaller distribution difference value based on a comparison result of the distribution difference value of the output voltage of the plurality of power battery units 100 with the distribution difference value of the output power / voltage; and generate a control signal corresponding to the selected power output mode.

[0059] Specifically, in some embodiments, by comparing the distribution difference values ​​of the output voltage and the output power / voltage, and selecting the one with the smaller distribution difference value for adjustment, the difficulty and complexity of the adjustment can be reduced. For example, if the distribution difference value of the output voltage is small, it is easier to achieve consistency by adjusting the voltage than by adjusting the power. By selecting the one with the smaller distribution difference value for adjustment, the output of each battery unit can be made consistent in a shorter time, thereby achieving the goal of system optimization more quickly.

[0060] Optionally, if the distribution difference value of the output voltage is small, it means that the output voltage of each battery unit is relatively consistent. In this case, selecting the voltage-priority power output mode can avoid system instability caused by voltage differences, such as overvoltage or undervoltage problems, thereby improving the overall stability of the system. If the distribution difference value of the output power / voltage is small, it means that the output power / voltage of each battery unit is relatively consistent. In this case, selecting the power-priority power output mode can achieve load balancing, avoid overloading or underloading of individual battery units, and improve the overall stability of the system.

[0061] By adjusting the output voltage and power, each battery cell can be ensured to work under similar conditions, avoiding premature aging of individual battery cells due to overload or overheating, thereby extending the service life of the entire system. The consistency of voltage and power can reduce the stress difference between battery cells, avoid battery damage caused by local overheating or overload, and extend the battery life.

[0062] Optional, in Figure 2 In the 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 acquisition module, and is configured to select the power output mode corresponding to the smaller distribution difference value of the output voltage and the output power / voltage according to the comparison result of the distribution difference value of the output voltage of the plurality of power battery units 100 and the distribution difference value of the output power / voltage; the distribution difference value can be calculated by the standard deviation or other statistical methods. Among them, the smaller one is selected as a reference indicator to determine whether the 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, then the output selection module 202 selects the power output mode of the output voltage.

[0065] The control signal generating module 203 is respectively communicatively connected to the battery information collecting module 201 and the output selecting module 202 , and based on the corresponding power output mode, generates the control signal according to the battery information to control the duty cycle of the conversion unit 300 , thereby adjusting the output voltage or output power through the conversion unit 300 .

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

[0067] The conversion unit 300 controls the output voltage or output power by adjusting the duty cycle of the switching device. The duty cycle refers to the ratio of the time that the switching device is in the on state to the entire cycle time in one cycle. Among them, by increasing the duty cycle, the output voltage will also increase accordingly; and 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 conditions remain unchanged, increasing the duty cycle will cause the output voltage to increase, which may in turn 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] Optional, in 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 of the conversion units 300 .

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

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

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

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

[0074] Among them, 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 make it close to the average power / voltage, load balancing is achieved. For example, when the output power / voltage of a battery unit is higher than the average power / voltage, its output power / voltage is reduced through the discharge state; when the output power / voltage of a battery unit is lower than the average power / voltage, its output power / voltage is increased through the charging state. Ultimately, the output power / voltage of all battery units will tend to the average value.

[0075] Optional, in Figure 4 In the example, the control signal may also be generated in the following manners, including:

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

[0077] Step S22 , calculating the difference between the output power / voltage of each conversion unit 300 and the average power / voltage.

[0078] Step S32, based on eliminating the difference as the goal, the charge / discharge rate of the corresponding power battery unit 100 is obtained in combination with the time 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 300 at the corresponding moment of the next preset cycle at the charge / discharge rate tends to be the same.

[0079] Specifically, compared to another embodiment in which the output power / voltage is adjusted by a simple discharge or charge state, this embodiment achieves dynamic adjustment by calculating the average rate, which can transition to the target output state more smoothly and reduce the impact of sudden changes.

[0080] 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 the output needs to be reduced. If (P1<P2), the difference is negative, indicating that the output power / voltage of the unit is lower than the target value and the output needs to be increased.

[0081] Set the duration of a preset cycle, which refers to the time interval from the current moment 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 a preset period. Include the calculated average rate in the control signal. After receiving the control signal, each conversion unit 300 adjusts 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, not in one step. This can avoid drastic changes in the 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 configured to output the control signal.

[0083] Optional, in Figure 5 In an embodiment, the energy management unit 200 also includes an energy distribution module 205, which is coupled to an external load and is used 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 300 meets the working power or working voltage of the external load.

[0084] Specifically, the energy distribution module 205 collects the operating voltage and operating power information of the external load in real time through a communication interface (such as CAN bus, MODBUS, etc.). This information includes but is not limited to the rated voltage, rated power, current working state, etc. of the load. The energy distribution module 205 calculates the total output power / voltage and total output voltage currently required based on the operating voltage and operating 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, thereby gradually adjusting the output voltage or output power within the next preset cycle so that it tends to meet the load demand.

[0085] exist Figure 1 In an embodiment, the input ends of the multiple conversion units 300 are electrically coupled to each of the power battery units 100 one by one, and the output ends are coupled to a bus 400. Each conversion unit 300 is communicatively coupled to the energy management unit 200 to obtain the control signal, which is used to adjust the output voltage of each power battery through the conversion unit 300 to be the same in response to the power output mode of the output voltage corresponding to the control signal; or, in response to the power output mode of the output power / voltage corresponding to the control signal, adjust the output power / voltage of each power battery through the conversion unit 300 to be the same.

[0086] Specifically, when the control signal indicates the power output mode of the output voltage, the conversion unit 300 adjusts the output voltage by adjusting the duty cycle to make it consistent. Specifically, if the output voltage of a battery cell 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 output mode of the output power / voltage, the conversion unit 300 adjusts the output power / voltage by adjusting the duty cycle to make it consistent. Specifically, if the output power / voltage of a battery cell 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 cells 100 tends to be the same, thereby achieving system balance and stability.

[0087] Optional, in Figure 6In the example, each of the conversion units 300 includes a DC-DC converter 301, and the DC-DC converter 301 is connected to a DC bus 401. The multiple DC-DC converters 301 adjust the output voltages on the AC bus 402 to be the same or adjust the output power / voltage to be the same.

[0088] Specifically, if the control signal indicates a power output mode of output voltage, the DC-DC converter 301 adjusts the output voltage by adjusting the duty cycle so that it tends to be consistent 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 a power output mode of output power / voltage, the DC-DC converter 301 adjusts the output power / voltage by adjusting the duty cycle so that it tends to be consistent on the AC bus 402. Specifically, by increasing or decreasing the duty cycle, the output power / voltage can be increased or decreased.

[0089] The DC-DC converter 301 mainly converts the DC power of the power battery unit 100 into DC power suitable for the DC bus 401 .

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

[0091] Specifically, 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 DC power suitable for the DC bus 401. The energy storage inverter 302 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 an inverter (if any), wherein the output adjustment mainly occurs on the DC side.

[0092] Optional, in Figure 8 In the example, the heterogeneous compatible system based on power batteries also includes:

[0093] a monitoring unit 600, coupled to each of the power battery units 100, for monitoring the working status of the power battery units 100 in real time;

[0094] A prompt unit 700 is coupled to the monitoring unit 600 and is used to display the working status.

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

[0096] Optional, in Fig. 9 In the example, a protection unit 800 is further disposed between the power battery unit 100 and the conversion unit 300 to protect the power battery unit 100 and an external load.

[0097] Specifically, in some embodiments, the operating state of the battery cell is monitored, such as voltage, current, temperature, etc. When an abnormal situation (such as overcharge, over discharge, short circuit, over temperature, etc.) is detected, the protection unit 800 can quickly cut off the circuit to prevent the spread of the fault and protect the battery cell and the external load from damage. The protection unit 800 may include but is not limited to an overcurrent protection circuit, an overvoltage protection circuit, an undervoltage protection circuit, a temperature protection circuit, etc.

[0098] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. Heterogeneous compatible system based on power battery, characterized by: include: A plurality of power battery units having a plurality of battery types, and 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 battery information of each of the power battery units, and configured to select a power output mode corresponding to the smaller distribution difference value of the output voltage or the output power / voltage according to a comparison result of the distribution difference value of the output voltages of the plurality of power battery units with the distribution difference value of the output power / voltage; generating a control signal corresponding to the selected power output mode; A plurality of conversion units, wherein the input ends are electrically coupled to each of the power battery units one by one, and the output ends are coupled to a bus, and each conversion unit is communicatively coupled to the energy management unit to obtain the control signal, and is used for adjusting the output voltage of each power battery through the conversion unit to be the same in response to the power output mode of the output voltage corresponding to 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 of the output power / voltage corresponding to the control signal.

2. The heterogeneous compatible system according to claim 1, characterized in that: Each of the conversion units includes a DC-DC converter, which is connected to a DC bus. The multiple DC-DC converters adjust their output voltages on the AC bus to be the same or adjust their output powers / voltages to be the same.

3. The heterogeneous compatible system according to claim 1, characterized in that: 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.

4. The heterogeneous compatible system according to claim 1, characterized in that: The control signal generation comprises: Calculating the average power / voltage of the output power / voltage of each of the conversion units; Calculate the difference between the output power / voltage of each conversion unit and the average power / voltage; When the difference is a positive value, generating the control signal to control the corresponding power battery unit to be in a discharging state; 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.

5. The heterogeneous compatible system according to claim 1, characterized in that: The control signal generation comprises: Calculating the average power / voltage of the output power / voltage of each of the conversion units; Calculate the difference between the output power / voltage of each conversion unit and the average power / voltage; 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 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 at the charge / discharge rate tends to be the same.

6. The heterogeneous compatible system according to claim 1, characterized in that: The energy management unit comprises: A battery information collection module, used to collect battery information of each of the power battery units; an output selection module, communicatively connected to the battery acquisition module, and configured to select a power output mode corresponding to the smaller distribution difference value of the output voltage and the output power / voltage according to a comparison result of 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; a control signal generating module, which is communicatively connected to the battery information collecting module and the output selecting module respectively, and generates the control signal according to the battery information based on the corresponding power output mode to control the duty cycle of the conversion unit, thereby adjusting the output voltage or output power through the conversion unit; The signal output module is coupled to the control signal generating module and the conversion unit, and is used for outputting the control signal.

7. The heterogeneous compatible system according to claim 1, characterized in that: The energy management unit also includes an energy distribution module coupled to an external load, for adjusting 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.

8. The heterogeneous compatible system according to claim 1, characterized in that: Also includes: a monitoring unit, coupled to the power battery units respectively, for monitoring the working status of the power battery units in real time; A prompt unit is coupled to the monitoring unit and is used to display the working status.

9. The heterogeneous compatible system according to claim 1, characterized in that: The power battery unit includes at least one of the following: a retired battery; a brand new battery.

10. The heterogeneous compatible system according to claim 1, characterized in that: A protection unit is also provided between the power battery unit and the conversion unit for protecting the power battery unit and an external load.

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