Energy storage balancing and regulating method and device based on dynamic time slice electric energy exchange

Abstract

The invention provides an energy storage balancing and regulating method and device based on dynamic time slice electric energy exchange. The method comprises the following steps: determining a current use scene of an energy storage battery pack; in the current use scene, performing index detection on the energy storage battery pack to obtain an index detection result; and under the condition that the index detection result is abnormal, shielding the single batteries and / or the battery pack in the energy storage battery pack to obtain a first electric energy slice, and performing active balanced charging and discharging on the energy storage battery pack by using the first electric energy slice. Therefore, direct dissipation of traditional passive equalization energy in the form of heat and the like and loss in the active equalization energy transfer process are avoided, equalization management in the energy storage charging and discharging process is improved, and the energy storage cycle efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power storage and distribution, and in particular to a method and device for energy storage balancing and regulation based on dynamic time slicing power exchange. Background Art

[0002] The balancing strategy of the existing energy storage battery management system is mainly used to solve inconsistency (referring to the differences in voltage, capacity, internal resistance, etc. of each battery in the battery pack, the battery pack has inconsistency, the inconsistency expands during use, and causes the battery with poor performance to be damaged rapidly, and finally causes the entire battery pack to be scrapped). There are two main forms: one is passive balancing, also known as energy dissipation balancing, and its working principle is to connect a resistor in parallel to each battery cell. When a battery cell is fully charged in advance and other batteries need to continue to be charged, the resistor releases the power in the form of heat to the high-voltage battery cell to gain more charging time for other batteries. The advantages of this method are mature technology and low cost, and it is suitable for small-capacity and low-string lithium battery pack applications. However, the disadvantage of passive balancing is low energy utilization, because the power released through the resistor cannot be reused, and long-term use may cause battery performance to deteriorate. The other is active balancing, also known as non-energy dissipative balancing. Its principle is to transfer the energy in the high-energy cells to the low-energy cells during the charge and discharge cycle, so that the charge in the battery pack is redistributed, thereby shortening the charging time and extending the discharge time. Compared with passive balancing, the advantage of active balancing is that it has a higher energy utilization rate, can ensure battery consistency, and extend the service life and mean time between failures of the battery pack.

[0003] However, the disadvantages of active balancing include technical complexity and high procurement costs; frequent circuit switching may increase stress inside the battery, accelerate the battery aging process, and thus affect the battery life; there is also loss in the energy transfer process; when the balancing module fails or the detected voltage is inaccurate, the balancing adjustment may fail, leading to overcharging or over-discharging, bringing potential safety risks. There is indeed room for further improvement in the balancing management of energy storage charging and discharging to improve the energy storage cycle efficiency. Summary of the invention

[0004] The present invention provides a method and device for energy storage balancing and regulation based on dynamic time-slicing electric energy exchange, which is used to solve the shortcomings of active balancing in the prior art, including technical complexity and high procurement cost; frequent circuit switching may increase the stress inside the battery, accelerate the aging process of the battery, and thus affect the battery life; there is also loss in the energy transfer process; when the balancing module fails or the detected voltage is inaccurate, the balancing adjustment may fail, resulting in overcharging or over-discharging, bringing potential safety risks.

[0005] The present invention provides a method for energy storage balancing and regulation based on dynamic time slicing electric energy exchange, comprising the following steps: Determine the current usage scenario of the energy storage battery pack; Under the current usage scenario, performing an index detection on the energy storage battery pack to obtain an index detection result; When the indicator detection result is abnormal, the battery cells and / or battery packs in the energy storage battery pack are shielded to obtain a first power energy slice, and the first power energy slice is used to actively balance the charging and discharging of the energy storage battery pack.

[0006] According to a method for energy storage balancing and regulation based on dynamic time-slicing electric energy exchange provided by the present invention, the step of determining that the indicator detection result is abnormal includes: When the current usage scenario is a charging scenario and the indicator detection result is greater than a first preset threshold, determining that the indicator detection result is abnormal; When the current usage scenario is a discharging scenario and the indicator detection result is less than a second preset threshold, it is determined that the indicator detection result is abnormal.

[0007] According to a method for energy storage balancing and regulation based on dynamic time-slicing electric energy exchange provided by the present invention, the indicator detection result includes at least one indicator detection result of the battery state of charge, the battery end-of-life status, the single cell voltage, the single cell current and the battery health status.

[0008] According to a method for energy storage balancing and regulation based on dynamic time-slicing electric energy exchange provided by the present invention, the method utilizes the first electric energy slice to actively balance the charging and discharging of the energy storage battery pack, and then further includes: In the current usage scenario, the energy storage battery pack is flexibly connected to the converter branch to obtain a second power energy slice; the second power energy slice is obtained based on the integral of the instantaneous power and the power supply time of the target power source.

[0009] According to a method for energy storage balancing and regulation based on dynamic time-sliced ​​electric energy exchange provided by the present invention, in the current usage scenario, the energy storage battery pack is flexibly connected to the converter branch to obtain a second electric energy slice, including: In the current usage scenario, determining a target converter branch corresponding to the output power of the energy storage bidirectional converter that matches the output power of the second electric energy slice; The energy storage battery pack is flexibly connected to the target converter branch to obtain the second electric energy slice.

[0010] The present invention also provides an energy storage balancing and control device based on dynamic time slicing electric energy exchange, comprising the following modules: Energy storage battery pack; A controller, wherein the controller is used to execute the energy storage balancing and regulation strategy method based on dynamic time slicing power exchange according to any one of claims 1 to 5.

[0011] According to an energy storage balancing and control device based on dynamic time-slicing electric energy exchange provided by the present invention, the energy storage battery pack includes multiple battery groups, and the multiple battery groups include battery cells, battery cell sensors, battery cell series switches and battery cell bypass switches; The energy storage battery pack is formed by connecting the battery cells in series through a plurality of the battery cell series switches, and then connecting the battery cells in parallel with the battery cell bypass switches; The battery cell sensor is connected in parallel with the battery cell, and the battery cell sensor is used to detect indicators of the battery cell; The plurality of battery packs are connected in parallel to a battery pack sensor, and the battery pack sensor is used to perform index detection on the corresponding battery packs.

[0012] According to the present invention, a storage balancing and control device based on dynamic time slicing electric energy exchange further includes: A converter branch, the converter branch being electrically connected to the energy storage battery pack; A converter branch sensor, the converter branch sensor is electrically connected to the converter branch, and the converter branch sensor is used to monitor the operating state of the converter branch; An energy storage bidirectional converter, the energy storage bidirectional converter being electrically connected to the converter branch; An energy storage battery pack sensor, the energy storage battery pack sensor is electrically connected to the energy storage battery pack, the energy storage battery pack sensor is used to perform index detection on the energy storage battery pack, and the energy storage battery pack sensor is electrically connected to a controller.

[0013] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the energy storage balancing and control method based on dynamic time slicing electric energy exchange as described in any one of the above is implemented.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the energy storage balancing and control methods based on dynamic time slicing electric energy exchange as described above.

[0015] The present invention also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned energy storage balancing and control methods based on dynamic time slicing electric energy exchange.

[0016] The energy storage balancing and control method and device based on dynamic time-sliced ​​electric energy exchange provided by the present invention, when the indicator detection result is abnormal, shields the battery cells and / or battery packs in the energy storage battery pack to obtain a first electric energy slice, and uses the first electric energy slice to actively balance the charging and discharging of the energy storage battery pack, thereby avoiding the traditional passive balancing energy directly dissipated in the form of heat, etc., and the loss in the active balancing energy transfer process, further improving the balancing management in the energy storage charging and discharging process and improving the energy storage cycle efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is one of the flow diagrams of the energy storage balancing and control method based on dynamic time slicing electric energy exchange provided by the present invention.

[0019] Figure 2 This is the second flow chart of the energy storage balancing and control method based on dynamic time slicing electric energy exchange provided by the present invention.

[0020] Figure 3 It is a structural schematic diagram of the energy storage balancing and regulation device based on dynamic time slicing electric energy exchange provided by the present invention.

[0021] Figure 4 It is a schematic diagram of the balanced regulation of the energy storage battery pack provided by the present invention.

[0022] Figure 5 It is a schematic diagram of the flexible connection between the energy storage battery pack and the converter branch provided by the present invention.

[0023] Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0025] The terms "first", "second", etc. in the present invention are used to distinguish similar objects, rather than to describe a specific order or precedence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type.

[0026] Figure 1 This is one of the flow diagrams of the energy storage balancing and control method based on dynamic time slicing power exchange provided by the present invention, such as Figure 1 As shown, the method includes step 110 , step 120 and step 130 .

[0027] Step 110, determining the current usage scenario of the energy storage battery pack.

[0028] Specifically, the current usage scenario of the energy storage battery pack can be determined first, where the current usage scenario can be a charging scenario or a discharging scenario. Here, the energy storage battery pack is also referred to as an energy storage PACK (Power Assemble Kit).

[0029] Here, the material, specification, and operating status of each energy storage battery pack are allowed to be different. For example, the system is compatible with energy storage battery packs of different materials such as lithium iron phosphate and lead carbon.

[0030] It should be noted that the charging scenarios include trickle charging, constant current charging, constant voltage charging and charging termination, etc., which are not specifically limited in the embodiments of the present invention.

[0031] Among them, trickle charging is used to make up for the capacity loss caused by self-discharge of the battery after it is fully charged, and is generally achieved by charging with a small pulse current. Constant current charging refers to a charging method in which the current is maintained at a constant value. Constant voltage charging refers to a charging method in which the voltage between the two poles of the battery is maintained at a constant value. Charging termination refers to the process of stopping charging.

[0032] Step 120, performing an index detection on the energy storage battery pack in the current usage scenario to obtain an index detection result.

[0033] Step 130, when the indicator detection result is abnormal, shield the battery cells and / or battery packs in the energy storage battery pack to obtain a first power energy slice, and use the first power energy slice to actively balance the charging and discharging of the energy storage battery pack.

[0034] Specifically, since the conditions for reporting abnormalities in indicator detection in charging scenarios and discharging scenarios are different, in the current usage scenario, an indicator detection is performed on the energy storage battery pack to obtain an indicator detection result.

[0035] When the indicator detection result is abnormal, the battery cells and / or battery packs in the energy storage battery pack are shielded to obtain a first power energy slice, and the first power energy slice is used to actively balance the charging and discharging of the energy storage battery pack.

[0036] That is, the battery cells in the energy storage battery pack may be shielded, the battery pack in the energy storage battery pack may be shielded, or the battery cells and the battery pack in the energy storage battery pack may be shielded at the same time, which is not specifically limited in the embodiment of the present invention.

[0037] Here, the first power energy slice is obtained according to the integration of the instantaneous power and the power supply time of the target power source.

[0038] Here, the indicator detection result includes but is not limited to at least one of the battery state of charge (State of Charge, SOC), battery end of life (End Of Life, EOL), single cell voltage, single cell current and battery health state (State of Health, SOH).

[0039] The method provided by the embodiment of the present invention can be applied to an AC or DC transmission power grid system. When the indicator detection result is abnormal, the battery cells and / or battery packs in the energy storage battery pack are shielded to obtain a first power energy slice, and the first power energy slice is used to actively balance the charge and discharge of the energy storage battery pack, thereby avoiding the traditional passive balancing energy directly dissipated in the form of heat, etc., and the loss in the active balancing energy transfer process, further improving the balancing management in the energy storage charging and discharging process and improving the energy storage cycle efficiency.

[0040] Based on the above embodiment, the step of determining that the indicator detection result is abnormal includes: When the current usage scenario is a charging scenario and the indicator detection result is greater than a first preset threshold, determining that the indicator detection result is abnormal; When the current usage scenario is a discharging scenario and the indicator detection result is less than a second preset threshold, it is determined that the indicator detection result is abnormal.

[0041] Specifically, when the current usage scenario is a charging scenario and the indicator detection result is greater than a first preset threshold, it is determined that the indicator detection result is abnormal.

[0042] For example, when the current usage scenario is a charging scenario, and at least one of the battery state of charge, battery end-of-life status, cell voltage, cell current and battery health status is greater than the corresponding indicator threshold, the indicator detection result is determined to be abnormal.

[0043] When the current usage scenario is a discharging scenario and the indicator detection result is less than a second preset threshold, it is determined that the indicator detection result is abnormal.

[0044] For example, when the current usage scenario is a discharge scenario, and at least one of the battery state of charge, battery end-of-life status, cell voltage, cell current and battery health status is less than the corresponding indicator threshold, the indicator detection result is determined to be abnormal.

[0045] It should be noted that the index detection of battery cells and battery packs in the energy storage battery pack can be implemented based on battery cell sensors and battery pack sensors respectively.

[0046] The method provided by the embodiment of the present invention combines the sensor detection analysis and switch matrix based on dynamic time-sliced ​​power exchange between battery cells / groups, and shields the battery cells / groups whose SOC, EOL, cell voltage, cell current and other indicator detection analysis values ​​are too high during the charging process, and shields the battery cells / groups whose SOC, EOL, cell voltage, cell current and other indicator detection analysis values ​​are too low during the discharging process, so as to balance the charging and discharging and reduce the inconsistency of the battery, thereby avoiding the traditional passive balancing energy directly dissipating in the form of heat, etc., and the loss in the active balancing energy transfer process.

[0047] In the related technology, the discharge and charging of the energy storage system usually rely on the energy storage bidirectional converter (Power Conversion System, PCS). In addition, when the existing energy storage supplies power to loads of different voltage levels, it usually adopts a power bus design, relying on the multi-stage converter behind the overall output side of the energy storage to complete the voltage regulation, and the converter itself will also bring certain losses. Therefore, there is indeed room for further improvement in reducing the number of current conversions between energy storage and loads to reduce the loss of the current conversion process and improve the energy storage cycle efficiency. In addition, most traditional energy storage is centralized conversion, which does not have the ability to charge and discharge at the same time, and usually uses battery packs of the same material.

[0048] Based on the above problem, the step 130 uses the first power energy slice to actively balance the charging and discharging of the energy storage battery pack, and then further includes: Step 131, in the current usage scenario, flexibly connect the energy storage battery pack and the converter branch to obtain a second power energy slice; the second power energy slice is obtained based on the integral of the instantaneous power and the power supply time of the target power source.

[0049] Specifically, in the current usage scenario, the energy storage battery pack is flexibly connected to the converter branch to obtain a second power energy slice, wherein the second power energy slice is obtained based on the integral of the instantaneous power and the power supply time of the target power source.

[0050] For example, in the current usage scenario, a target converter branch corresponding to the output power of the energy storage bidirectional converter matching the output power of the second electric energy slice is determined.

[0051] Then, the energy storage battery pack is flexibly connected to the target converter branch to obtain a second electric energy slice.

[0052] It should be noted that the sensor detection analysis and switch matrix based on dynamic time slicing of power exchange between the energy storage battery pack and the converter are combined, and the operating status of each branch battery pack and each converter branch is detected on a dynamic time scale, so that the dynamic combination and matching of fluctuating sources and loads can be achieved through flexible connections, the number of conversion links can be reduced, the conversion loss can be reduced, the energy utilization rate can be improved, and the simultaneous charging and discharging of the energy storage system can be supported.

[0053] It can be understood that based on the dynamic time scale detection of the charging power and power consumption of each converter branch, the bidirectional flow of electric energy between the energy storage and each converter branch is regarded as the flow of energy slices on a small time scale, which can accurately control the power selection and improve the economic efficiency.

[0054] The power dispatching architecture of dynamic time-slicing power exchange is adopted to replace the traditional energy storage power bus connection method, and a time-multiplexing flexible connection power switch matrix is ​​established to ensure the system's goal of improving the efficiency of energy storage cycles.

[0055] Based on any of the above embodiments, Figure 2 This is the second flow chart of the energy storage balancing and control method based on dynamic time slicing power exchange provided by the present invention, such as Figure 2 As shown, the current usage scenario of the energy storage battery pack is detected. When the current usage scenario is the charging scenario, the dynamic time scale detection and analysis of the operating status of the battery cell / group (voltage, current, SOC, EOL and SOH, etc.) are carried out, and the battery cell / group with excessively high detection indicators is shielded. In addition, the dynamic time scale detection of the current charging process (trickle, constant current and constant voltage, termination) is carried out, and the switch is switched to the corresponding converter branch.

[0056] When the current usage scenario is a discharge scenario, the dynamic time scale detects and analyzes the operating status (voltage, current, SOC, EOL and SOH, etc.) of the battery cells / groups, and shields the battery cells / groups with too low detection indicators. In addition, the dynamic time scale detects the operating status of the energy storage battery pack and the operating status of the converter branch, and flexibly connects the energy storage battery pack with the converter branch.

[0057] The energy storage balancing and control device based on dynamic time slicing electric energy exchange provided by the present invention is described below. The energy storage balancing and control device based on dynamic time slicing electric energy exchange described below and the energy storage balancing and control method based on dynamic time slicing electric energy exchange described above can be referred to each other.

[0058] Based on any of the above embodiments, the present invention provides an energy storage balancing and control device based on dynamic time slicing electric energy exchange, Figure 3 is a structural schematic diagram of the energy storage balancing and control device based on dynamic time slicing power exchange provided by the present invention, such as Figure 3 As shown, the device comprises: Energy storage battery pack 10; A controller 20, which is used to execute the energy storage balancing and regulation strategy method based on dynamic time slicing power exchange as claimed in the claim.

[0059] Specifically, the device includes an energy storage battery pack 10 and a controller 20 . Figure 4 Schematic diagram of the balanced regulation of the energy storage battery pack provided by the present invention, such as Figure 4 As shown, the energy storage battery pack 10 includes a plurality of battery packs, and the plurality of battery packs include battery cells, battery cell sensors, battery cell series switches, and battery cell bypass switches.

[0060] The energy storage battery pack 10 is formed by connecting battery cells in series through a plurality of battery cell series switches, and then connecting the battery cells in parallel with a battery cell bypass switch.

[0061] The battery cell sensor is connected in parallel with the battery cell, and the battery cell sensor is used to perform index detection on the battery cell.

[0062] A plurality of battery packs are connected in parallel to the battery pack sensors, and the battery pack sensors are used to perform index detection on the corresponding battery packs.

[0063] Figure 4 The symbols are explained as follows: d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13, d14, d15, dn represent each battery cell; k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, k14, k15, kn represent the bypass switches of each battery cell; k-1, k-2, k-3, k-4, k-5, k-6, k-7, k-8, k-9, k-10, k-11, k-12, k-13, k-14, k-15, kn represent the series connection switches of each battery cell; s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13, s14, s15, sn represent the sensors of each battery cell; p1, p2, p3, pn represent the sensors of each battery pack; t1 and tn represent the sensors of each battery pack; PACK 1 and PACK n represent the energy storage battery packs; pk1, pk2, pk3, pk4, pk5, pkn, pk-1, pk-2, pk-3, pk-4, pk-5, pk-n represent switches between each energy storage battery pack and the converter branch; PCS 1, PCS 2, and PCS N represent the energy storage converter branches; p-1, p-2, and pn represent the sensors of each converter branch.

[0064] In addition, the energy storage balancing and control device based on dynamic time slicing electric energy exchange also includes: A converter branch, one end of which is connected to an energy storage battery pack; A converter branch sensor, the converter branch sensor is electrically connected to the converter branch, and the converter branch sensor is used to monitor the operating state of the converter branch; An energy storage bidirectional converter, the energy storage bidirectional converter is electrically connected to the converter branch; An energy storage battery pack sensor is electrically connected to the energy storage battery pack. The energy storage battery pack sensor is used to perform index detection on the energy storage battery pack. The energy storage battery pack sensor is electrically connected to the controller.

[0065] Among them, single cell monomers D1, D2, D3 and D4 are connected in series through k-1, k-2, k-3 and k-4 battery monomer series switches respectively; single cell monomers D5, D6, D7 and D8 are connected in series through k-5, k-6, k-7 and k-8 battery monomer series switches respectively; single cell monomers D9, D10, D11 and D12 are connected in series through k-9, k-10, k-11 and k-12 battery monomer series switches respectively; single cell monomers D13, D14, D15 and DN are connected in series through k-13, k-14, k-15 and kn battery monomer series switches respectively.

[0066] The battery cell d1 is connected in parallel with the battery cell sensor s1, the battery cell d2 is connected in parallel with the battery cell sensor s2, the battery cell d3 is connected in parallel with the battery cell sensor s3, ..., the battery cell dn is connected in parallel with the battery cell sensor sn.

[0067] The k1, k2, k3, and k4 battery cell bypass switches are connected in series and connected in parallel with the battery pack sensor p1. The k5, k6, k7, and k8 battery cell bypass switches are connected in series and connected in parallel with the battery pack sensor p2. The k9, k10, k11, and k12 battery cell bypass switches are connected in series and connected in parallel with the battery pack sensor p3. The k13, k14, k15, and kn battery cell bypass switches are connected in series and connected in parallel with the battery pack sensor pn.

[0068] After being connected in parallel, each battery group is connected in parallel with the battery pack sensor, and the energy storage battery pack PACK 1 is connected to the energy storage inverter branch sensor p-1 and the energy storage inverter branch PCS 1 through the energy storage battery pack and the inverter branch switch pk1, the energy storage battery pack PACK 1 is connected to the energy storage inverter branch sensor p-2 and the energy storage inverter branch PCS 2 through the energy storage battery pack and the inverter branch switch pk2, and the energy storage battery pack PACK 1 is connected to the energy storage inverter branch sensor pn and the energy storage inverter branch PCS N through the energy storage battery pack and the inverter branch switch pk3. The energy storage battery pack PACK n is connected to the energy storage converter branch sensor p-1 and the energy storage converter branch PCS 1 through the switch pk4 between the energy storage battery pack and the converter branch, the energy storage battery pack PACK n is connected to the energy storage converter branch sensor p-2 and the energy storage converter branch PCS 2 through the switch pk5 between the energy storage battery pack and the converter branch, and the energy storage battery pack PACK n is connected to the energy storage converter branch sensor pn and the energy storage converter branch PCS N through the switch pkn between the energy storage battery pack and the converter branch.

[0069] In the embodiment of the present invention, the bypass switches of the battery cells k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, k14, k15, and kn, and the series switches of the battery cells k-1, k-2, k-3, k-4, k-5, k-6, k-7, k-8, k-9, k-10, k-11, k-12, k-13, k-14, k-15, and kn form a switch matrix.

[0070] It should be noted that the battery cells d1, d2…dn are connected in series through the k-1, k-2…kn battery cell series switches and then connected in parallel to form an energy storage battery pack. The battery SOC, EOL, cell voltage, cell current and other indicators are detected and analyzed through the s1, s2…sn battery cell sensors. The battery pack operation indicators are detected and analyzed through the p1, p2…pn battery pack sensors. During the charging and discharging process, when the battery cell detection indicators are abnormal, the corresponding battery cell bypass switches k1, k2…kn are closed, and the corresponding battery cell series switches are disconnected; when the battery pack detection indicators are abnormal, all switches in the battery pack are disconnected; when the t1…tn energy storage battery pack sensors detect and analyze that the PACK 1…PACK n energy storage battery pack is abnormal, in addition to disconnecting the corresponding pk1, pk2…pkn energy storage battery pack and the converter branch switches, the corresponding energy storage battery pack switches (for example, the battery cell bypass switches k1, k2…kn and the k-1, k-2…kn battery cell series switches) are disconnected. This allows shielding of battery cells / groups / packs with abnormal indicators.

[0071] The controller controls the energy storage battery pack to generate energy slices for balanced regulation. The battery cell sensor is used to detect the index of the battery cell to obtain the first index detection result, and the battery pack sensor is used to detect the index of the corresponding battery pack to obtain the second index detection result. The battery cell sensor sends the first index detection result to the controller, and the battery pack sensor sends the second index detection result to the controller. The controller receives the first index detection result and the second index detection result, and based on the first index detection result and the second index detection result, sends a control instruction to control the energy storage battery pack to generate energy slices for balanced regulation.

[0072] For example, when the indicator detection result is the detection result of the single cell voltage, at this time, the controller is equivalent to a voltage comparator, and the controller compares the single cell voltage detection result in the indicator detection result with the standard voltage, and outputs a high-level signal or a low-level signal. Among them, the high-level signal or the low-level signal is equivalent to a control instruction. For example, in the charging scenario, the energy storage battery pack generates energy slices for balanced regulation after receiving a high-level signal, and does not regulate after receiving a low-level signal; in the discharging scenario, the energy storage battery pack generates energy slices for balanced regulation after receiving a low-level signal, and does not regulate after receiving a high-level signal, thereby realizing balanced regulation of the energy storage battery pack.

[0073] Figure 5 Schematic diagram of the flexible connection between the energy storage battery pack and the converter branch provided by the present invention, such as Figure 5 As shown, Figure 5 The symbols are explained as follows: E1, E2, E3, and En represent energy storage battery packs; a1, a2, a3, an represent the sensors of each energy storage battery pack; b1, b2, b3, bn represent the branches of each energy storage converter; c1, c2, c3, cn represent the sensors of each converter branch; S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, and Sn represent switches between each energy storage battery pack and the converter branch.

[0074] During the charging and discharging process, the energy storage battery pack and the converter branch are subjected to dynamic time scale detection and analysis of voltage, current, power and other indicators on both sides of the source and load in different charging and discharging scenarios through the energy storage battery pack sensors a1, a2…an and the converter branch sensors c1, c2…cn. The energy storage battery pack and the converter branch are connected flexibly between the source and load of the energy storage battery pack E1, E2, E3…En and the energy storage converter branch b1, b2, b3…bn by using the switches between the energy storage battery pack and the converter branch S1, S2…Sn. The following is a possible implementation example: Prevent overcharge / discharge of some battery cells: close the battery cell bypass switch and disconnect the battery cell series switch, that is, shield the battery cell; Multiple battery packs combined discharge: Multiple battery packs are switched to the same converter branch through switches (for example, Figure 5 Close switches S1 and S2); Multiple converter branches combined charging: Multiple converter branches are switched to the same battery pack through switches (for example, Figure 5 Close S1 and S5); The energy storage system charges and discharges simultaneously, etc.

[0075] In the embodiment of the present invention, switches between the energy storage battery packs S1, S2 ... Sn and the converter branches form a power switch matrix.

[0076] The embodiment of the present invention provides a technical solution that combines dynamic time-slicing power exchange to promote the improvement of the balancing strategy of the energy storage battery management system and the energy storage system regulation strategy, and further improves the energy storage cycle efficiency. It aims to use the sensor detection analysis of dynamic time-slicing power exchange to perform dynamic time-scale detection on the operating status of the energy storage battery cells / groups / packs and each branch converter, so that the battery packs corresponding to the needs and the converter branches corresponding to the needs are flexibly connected through the power switch matrix of dynamic time-slicing power exchange, so as to achieve small-time-scale observation of the supply and demand situation on the power transmission line, obtain directly usable energy slices, and then accurately regulate the energy storage system based on this power energy slice, so as to achieve the goal of improving the efficiency of energy storage cycle economy and energy conservation and environmental protection. Figure 4It can be applied to balance management during battery charging and discharging. Based on the detection and analysis of battery cell / cell group voltage, cell current, SOC, EOL and other indicators, and using the switch matrix of dynamic time slicing power exchange, it can shield indicators with too low detection and analysis values ​​during discharge, and shield indicators with too high detection and analysis values ​​during charging. Figure 5 Through the sensor detection analysis and power switch matrix of dynamic time-slicing energy exchange, the energy storage battery pack is flexibly connected to branch converters of different voltage levels. When the energy storage battery pack does not match the voltage, power and other indicators of the converter branch, it switches to the appropriate converter branch.

[0077] This embodiment provides dynamic time scale detection and analysis and flexible connection of energy storage battery cells, battery groups, battery packs and converter branches, abandons the traditional power bus connection, decouples multiple converter branches (loads, charging power supplies) and independent power source selection switches, can be flexibly combined and flexibly connected, has the ability to charge and discharge simultaneously, reduces the number of converter links, and the proposed balancing strategy avoids energy loss while avoiding overcharging and over-discharging of battery cells, thereby comprehensively improving the energy storage cycle efficiency.

[0078] The sensor detection analysis and switch matrix based on dynamic time-slicing power exchange between the energy storage battery pack and the converter are combined, and the dynamic time scale observation and detection of the operating status of each branch battery pack and each converter branch are used to achieve dynamic adaptation between fluctuating sources and loads, reduce conversion losses, and improve energy utilization while having the ability to charge and discharge simultaneously. (Note: For each branch composed of multiple converters and the converter with multiple branch functions, they are uniformly understood as converter branches in the present invention.) Figure 6 is a schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the energy storage balancing and control method based on dynamic time-slicing electric energy exchange, the method comprising: determining the current use scenario of the energy storage battery pack; in the current use scenario, performing an index detection on the energy storage battery pack to obtain an index detection result; when the index detection result is abnormal, shielding the battery cells and / or the battery pack in the energy storage battery pack to obtain a first electric energy slice, and using the first electric energy slice to actively balance the charge and discharge of the energy storage battery pack.

[0079] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0080] On the other hand, the present invention also provides a computer program product, which includes a computer program, and the computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the energy storage balancing and control method based on dynamic time-slicing electric energy exchange provided by the above methods, and the method includes: determining the current usage scenario of the energy storage battery pack; under the current usage scenario, performing an indicator detection on the energy storage battery pack to obtain an indicator detection result; when the indicator detection result is abnormal, shielding the battery cells and / or battery packs in the energy storage battery pack to obtain a first electric energy slice, and using the first electric energy slice to actively balance the charging and discharging of the energy storage battery pack.

[0081] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the energy storage balancing and control method based on dynamic time-slicing electric energy exchange provided by the above-mentioned methods, the method comprising: determining a current usage scenario of an energy storage battery pack; under the current usage scenario, performing an indicator detection on the energy storage battery pack to obtain an indicator detection result; when the indicator detection result is abnormal, shielding the battery cells and / or battery packs in the energy storage battery pack to obtain a first electric energy slice, and using the first electric energy slice to actively balance the charging and discharging of the energy storage battery pack.

[0082] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0083] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for energy storage balancing and regulation based on dynamic time slicing energy exchange, characterized in that: include: Determine the current usage scenario of the energy storage battery pack; In the current usage scenario, performing an index detection on the energy storage battery pack to obtain an index detection result; When the indicator detection result is abnormal, the battery cells and / or battery packs in the energy storage battery pack are shielded to obtain a first power energy slice, and the first power energy slice is used to actively balance the charging and discharging of the energy storage battery pack.

2. The energy storage balancing and control method based on dynamic time slicing power exchange according to claim 1 is characterized in that: The step of determining that the indicator detection result is abnormal includes: When the current usage scenario is a charging scenario and the indicator detection result is greater than a first preset threshold, determining that the indicator detection result is abnormal; When the current usage scenario is a discharging scenario and the indicator detection result is less than a second preset threshold, it is determined that the indicator detection result is abnormal.

3. The energy storage balancing and control method based on dynamic time slicing power exchange according to claim 2 is characterized in that: The indicator detection result includes at least one indicator detection result of the battery state of charge, the battery end-of-life status, the single cell voltage, the single cell current and the battery health status.

4. The energy storage balancing and control method based on dynamic time slicing power exchange according to any one of claims 1 to 3, characterized in that: The step of utilizing the first power energy slice to actively balance charging and discharging the energy storage battery pack further includes: In the current usage scenario, the energy storage battery pack is flexibly connected to the converter branch to obtain a second power energy slice; the second power energy slice is obtained based on the integral of the instantaneous power and the power supply time of the target power source.

5. The energy storage balancing and control method based on dynamic time slicing power exchange according to claim 4 is characterized in that: The step of flexibly connecting the energy storage battery pack and the converter branch to obtain a second electric energy slice under the current usage scenario includes: In the current usage scenario, determining a target converter branch corresponding to the output power of the energy storage bidirectional converter that matches the output power of the second electric energy slice; The energy storage battery pack is flexibly connected to the target converter branch to obtain the second electric energy slice.

6. An energy storage balancing and control device based on dynamic time slicing power exchange, characterized in that: include: Energy storage battery pack; A controller, wherein the controller is used to execute the energy storage balancing and regulation strategy method based on dynamic time slicing power exchange according to any one of claims 1 to 5.

7. The energy storage balancing and control device based on dynamic time slicing power exchange according to claim 6 is characterized in that: The energy storage battery pack includes a plurality of battery packs, and the plurality of battery packs include battery cells, battery cell sensors, battery cell series switches, and battery cell bypass switches; The energy storage battery pack is formed by connecting the battery cells in series through a plurality of the battery cell series switches, and then connecting the battery cells in parallel with the battery cell bypass switches; The battery cell sensor is connected in parallel with the battery cell, and the battery cell sensor is used to detect indicators of the battery cell; The plurality of battery packs are connected in parallel to a battery pack sensor, and the battery pack sensor is used to perform index detection on the corresponding battery packs.

8. The energy storage balancing and control device based on dynamic time slicing power exchange according to claim 6 or 7, characterized in that: Also includes: A converter branch, the converter branch being electrically connected to the energy storage battery pack; A converter branch sensor, the converter branch sensor is electrically connected to the converter branch, and the converter branch sensor is used to monitor the operating state of the converter branch; An energy storage bidirectional converter, the energy storage bidirectional converter being electrically connected to the converter branch; An energy storage battery pack sensor, the energy storage battery pack sensor is electrically connected to the energy storage battery pack, the energy storage battery pack sensor is used to perform index detection on the energy storage battery pack, and the energy storage battery pack sensor is electrically connected to a controller.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the energy storage balancing and control method based on dynamic time slicing power exchange as described in any one of claims 1 to 5 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the energy storage balancing and control method based on dynamic time slicing power exchange as described in any one of claims 1 to 5 is implemented.

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