Battery array and battery system

Abstract

Disclosed in the present disclosure are a battery array and a battery system. The battery array comprises a plurality of stacked assemblies. Each stacked assembly comprises first power generation units and second power generation units arranged in sequence. A plurality of first power generation units are electrically connected to form one first photovoltaic string, and a plurality of second power generation units are electrically connected to form one second photovoltaic string. A positive output end and a negative output end of one first photovoltaic string are correspondingly connected to a positive input end and a negative input end of one direct current port, respectively; and a positive output end and a negative output end of one second photovoltaic string are correspondingly connected to a positive input end and a negative input end of one direct current port, respectively. The first power generation units and the second power generation units respectively and independently form photovoltaic strings connected to inverters, eliminating the need for layout adjustments to the power generation units and for introduction of a new electrical component, and mitigating the mismatch problem between different power generation units.

Description

Battery array and battery system

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410866098.2, filed on June 28, 2024, entitled “Battery array and battery system”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the field of battery management, in particular, to a battery array and a battery system. BACKGROUND

[0004] At present, in order to improve the power generation efficiency of the battery, different monomer batteries are often combined for power supply. Taking a photovoltaic battery as an example, different types of photovoltaic sub-string components are stacked to form a laminated solar module, which can further improve the existing photovoltaic energy conversion efficiency and reduce the power generation cost through two or more bandgap light-absorbing layers. However, for combined batteries, the electrical parameters of different types of monomer batteries are different, and the matching of battery versions is difficult. In addition, the power generation conditions of different types of monomer batteries under different irradiation, different temperatures and different shielding conditions are also different, which may lead to different output voltages of different layers of monomer batteries, resulting in matching difficulties, low power supply efficiency and other problems when the laminated battery is connected to a photovoltaic system. SUMMARY

[0005] The present disclosure provides a battery array and a battery system, which can complete the connection of a laminated module system and improve the mismatching of different power generation units. The technical solution of the present disclosure is as follows:

[0006] In a first aspect, the present disclosure provides a battery array, which includes a plurality of laminated modules, each laminated module including a first power generation unit and a second power generation unit arranged in sequence; a plurality of first power generation units are electrically connected to form a first photovoltaic string, and a plurality of second power generation units are electrically connected to form a second photovoltaic string; the battery array further includes a plurality of inverters, each inverter including a plurality of direct current ports; each direct current port includes a positive input terminal and a negative input terminal; the positive output terminal and the negative output terminal of a first photovoltaic string are respectively connected to the positive input terminal and the negative input terminal of a direct current port, and the positive output terminal and the negative output terminal of a second photovoltaic string are respectively connected to the positive input terminal and the negative input terminal of another direct current port.

[0007] The first photovoltaic string formed by electrically connecting the first generating units is connected to the inverter, and the second photovoltaic string formed by electrically connecting the second generating units is also connected to the inverter. Without directly connecting the different types of generating units, the stacked assembly system is connected without adjusting the type of generating unit and introducing new electrical elements, the mismatch of different photovoltaic strings is improved, and the power generation adaptation loss of different cells in the stacked assembly is reduced.

[0008] In some embodiments, a plurality of first generating units are connected in series to form a first photovoltaic sub-string, and a plurality of first photovoltaic sub-strings are connected in parallel to form a first photovoltaic string; or a plurality of first generating units are connected in parallel to form a first photovoltaic sub-string, and a plurality of first photovoltaic sub-strings are connected in series to form a first photovoltaic string; a plurality of second generating units are connected in series to form a second photovoltaic sub-string, and a plurality of second photovoltaic sub-strings are connected in parallel to form a second photovoltaic string; or a plurality of second generating units are connected in parallel to form a second photovoltaic sub-string, and a plurality of second photovoltaic sub-strings are connected in series to form a second photovoltaic string.

[0009] In the above technical means, the same generating units in different stacked assemblies are connected in series to form photovoltaic sub-strings, the photovoltaic sub-strings are connected in parallel to form photovoltaic strings, and then the photovoltaic strings are connected to the direct current port of the inverter; or the same cells in different stacked assemblies are connected in parallel to form photovoltaic sub-strings, the photovoltaic sub-strings are connected in series to form photovoltaic strings, and then the photovoltaic strings are connected to the direct current port of the inverter. In this way, there is no direct electrical connection between different types of generating units, and the stacked assembly system is connected without adjusting the type of generating unit and introducing new electrical elements, and the mismatch of electrical parameters of different generating units is improved.

[0010] In some embodiments, the battery array further includes a plurality of battery supports, each battery support being used to place a stacked assembly; the number of stacked assemblies accommodated by the battery supports is an integer multiple of the number of first generating units included in the first photovoltaic string, and the number of stacked assemblies accommodated by the battery supports is an integer multiple of the number of second generating units included in the second photovoltaic string.

[0011] In the field of photovoltaic cells, the first photovoltaic string and the second photovoltaic string of a single set of battery supports are both integers, which facilitates the connection of assemblies and the connection of strings.

[0012] In some embodiments, the first power generation units are electrically connected by a plurality of first power generation sub-units, and the second power generation units are electrically connected by a plurality of second power generation sub-units; the electrical parameters of the first power generation units are adjusted by adjusting the number and / or series-parallel connection structure of the first power generation sub-units, so that the number of the stacked assemblies accommodated by the battery holder is an integral multiple of the number of the first power generation units included in the first photovoltaic string; the electrical parameters of the second power generation units are adjusted by adjusting the number and / or series-parallel connection structure of the second power generation sub-units, so that the number of the stacked assemblies accommodated by the battery holder is an integral multiple of the number of the second power generation units included in the second photovoltaic string.

[0013] By the above technical means, the number of the power generation units in the photovoltaic string is changed by adjusting the number and / or series-parallel connection structure of the power generation sub-units in the power generation units, thereby changing the electrical parameters of the power generation units, so that the number of the first photovoltaic string and the number of the second photovoltaic string of a single set of battery holder are both integers, facilitating the connection of the assemblies and the connection of the strings.

[0014] In some embodiments, the number of the first power generation units included in the first photovoltaic string and the number of the second power generation units included in the second photovoltaic string are in an integral multiple relationship.

[0015] By the above technical means, the number of a single set of battery holder can be designed to be smaller, facilitating the circuit connection.

[0016] In some embodiments, the plurality of stacked assemblies are arranged in an array, and the row direction of the array is a first direction, the column direction of the array is a second direction, the first direction is perpendicular to a third direction, and the second direction is perpendicular to the third direction; the first power generation units and the second power generation units are stacked along the third direction, and the second power generation units are arranged on the light-emitting side of the first power generation units; the first power generation units in all the stacked assemblies are of the same type, the second power generation units in all the stacked assemblies are of the same type, and the first power generation units and the second power generation units are of different types.

[0017] By the above technical means, different types of power generation units do not need to be connected in direct current, but are connected to the direct current ports of the inverters respectively, realizing the system access of the stacked batteries, and improving the mismatch problem of different types of power generation units.

[0018] In some embodiments, each inverter further includes a plurality of power point tracking modules, the number of the power point tracking modules is less than or equal to the number of the direct current ports, and the same power point tracking module is connected to a plurality of photovoltaic strings under the direct current ports; each power point tracking module is configured to track the maximum power point of the connected photovoltaic string, and adjust the output parameters of the connected photovoltaic string based on the tracking result, so that the photovoltaic string is in a maximum power state; wherein the photovoltaic strings connected by the same power point tracking module are all first photovoltaic strings or all second photovoltaic strings.

[0019] Through the technical means, the power point tracking module in the inverter adjusts the output power of the photovoltaic string as a whole, thereby improving the power supply efficiency of the photovoltaic string.

[0020] In some embodiments, the first photovoltaic sub-string further has a first protection device arranged in series; the second photovoltaic sub-string further has a second protection device arranged in series; and the first protection device and the second protection device both allow unidirectional current flow.

[0021] Through the technical means, the first protection device / second protection device can prevent reverse current flow to the first power generation unit / second power generation unit, thereby improving the battery life.

[0022] In some embodiments, the first photovoltaic sub-string further has a third protection device arranged in series, and the third protection device controls the first photovoltaic sub-string to be in an open circuit state when the current flowing through the third protection device is higher than a threshold value; the second photovoltaic sub-string further has a fourth protection device arranged in series, and the fourth protection device controls the second photovoltaic sub-string to be in an open circuit state when the current flowing through the fourth protection device is higher than a threshold value.

[0023] Through the technical means, when the battery fails or is in an abnormal condition, the first power generation unit layer is disconnected, and no negative impact is brought to the working state of the photovoltaic sub-string string.

[0024] In some embodiments, the first photovoltaic string further includes a plurality of first voltage regulation modules, each first voltage regulation module is connected to the output end of a first photovoltaic sub-string and is configured to perform voltage boosting and / or voltage reducing processing on the voltage output by the first photovoltaic sub-string; and the second photovoltaic string includes a plurality of second voltage regulation modules, each second voltage regulation module is connected to the output end of a second photovoltaic sub-string and is configured to perform voltage boosting and / or voltage reducing processing on the voltage output by the second photovoltaic sub-string.

[0025] Through the technical means, power optimization at the string level can be achieved, and voltage mismatch between the parallel first photovoltaic sub-strings or the parallel second photovoltaic sub-strings is reduced.

[0026] In some embodiments, each stack assembly further includes a third power generation unit, the first power generation unit, the second power generation unit, and the third power generation unit are stacked along a third direction, and the third power generation unit is located on the light output side of the second power generation unit; a plurality of third power generation units are electrically connected to form a third photovoltaic string; and the positive output end and the negative output end of one third photovoltaic string are respectively connected to the positive input end and the negative input end of one direct current port.

[0027] Through the technical means, for any number of stacked stack assemblies, good system access can be achieved, and the mismatch problem of different power generation units is improved.

[0028] In a second aspect, the embodiments of the present disclosure provide a battery system, the battery system comprising the battery array of the first aspect.

[0029] By means of the above technical means, the stacked component system can be connected without adjusting the version of the power generation unit and introducing new electrical elements, and the mismatch of different photovoltaic power generation units can be improved. Thus, the stacked component (for example, crystalline silicon / calcium titanate) can be connected to the photovoltaic system without adding other electrical elements and without complex internal version design, and the power generation adaptation loss of different batteries in the stacked component can be reduced.

[0030] The battery array and the battery system provided by the embodiments of the present disclosure can connect the first photovoltaic string formed by electrically connecting the first power generation unit to the inverter, and connect the second photovoltaic string formed by electrically connecting the second power generation unit to the inverter, without directly connecting the different types of power generation units. The stacked component system can be connected without adjusting the version of the power generation unit and introducing new electrical elements, and the mismatch of different photovoltaic strings can be improved, and the power generation adaptation loss of different batteries in the stacked component can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] FIG. 1 is a structural schematic diagram of a power generation unit, a stacked component, and a photovoltaic string provided by the embodiments of the present disclosure;

[0032] FIG. 2 is a structural schematic diagram of a battery array provided by the embodiments of the present disclosure;

[0033] FIG. 3 is a structural schematic diagram of a stacked component provided by the embodiments of the present disclosure;

[0034] FIG. 4 is a structural schematic diagram of a battery array provided by the embodiments of the present disclosure;

[0035] FIG. 5 is a structural schematic diagram of a battery array provided by the embodiments of the present disclosure;

[0036] FIG. 6 is a structural schematic diagram of a battery array provided by the embodiments of the present disclosure;

[0037] FIG. 7 is a connection structural schematic diagram of a Boost circuit provided by the embodiments of the present disclosure;

[0038] FIG. 8 is a connection structural schematic diagram of a Buck circuit provided by the embodiments of the present disclosure;

[0039] FIG. 9 is a structural schematic diagram of a battery array provided by the embodiments of the present disclosure;

[0040] FIG. 10 is a connection structural schematic diagram of a photovoltaic cell support provided by the embodiments of the present disclosure;

[0041] FIG. 11 is a schematic diagram of a battery system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and are not intended to limit the embodiments of the present disclosure.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terminology used in the specification herein is for the purpose of describing the embodiments of the present disclosure only and is not intended to limit the present disclosure.

[0044] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0045] It should also be noted that the terms "first", "second", "third" in the embodiments of the present disclosure are only used to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that "first", "second", "third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0046] In addition, in the embodiments of the present disclosure, it should also be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only used for the purpose of describing the present disclosure and simplifying the description. Without making the opposite statement, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the scope of protection of the present disclosure; the orientation words "inner, outer" refer to the inner and outer relative to the outline of each component.

[0047] For purposes of the description hereinafter, spatial

[0048] It is further understood that when a component is referred to as being "on" another component, "connected to" another component, "coupled to" another component, or "contacting" another component, it can be directly on, connected, coupled, or contacting the other component, or intervening components can be present. In addition, it is further understood that when a first component is referred to as being "electrically connected," "electrically in contact," or "electrically coupled" to a second component, there is an electrical path between the first component and the second component that allows electrical current flow. The electrical path can include capacitors, coupled inductors, and / or other components that allow electrical current flow, even if there is no direct contact between conductive components.

[0049] Glossary:

[0050] MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor): Metal-Oxide-Semiconductor Field-Effect Transistor;

[0051] IGBT (Insulate-Gate Bipolar Transistor): Insulate-Gate Bipolar Transistor;

[0052] DC / DC (Direct Current / Direct Current): Direct Current / Direct Current conversion.

[0053] For the purpose of the description hereinafter, the meaning of the battery concept referred to by the present disclosure is explained with reference to FIG. 1:

[0054] (1) Power generation unit

[0055] The power generation unit refers to a basic unit capable of converting other forms of energy and electrical energy, such as a sub-cell composed of a bottom electrode, a semiconductor layer, and a top electrode in a thin-film battery (e.g., a perovskite battery) (separated and connected in series and parallel through P1, P2, and P3 scribing grooves in the preparation process), or a battery piece in a non-thin-film battery (e.g., a crystalline silicon battery). Generally, the power generation unit does not have independent positive and negative electrodes, but is connected in series and parallel (FIG. 1 only shows the full series connection structure of a perovskite power generation unit as an example, but does not constitute a relevant limitation) to form a power generation unit before the independent positive and negative electrodes are connected.

[0056] (2) Power generation unit

[0057] Referring to FIG. 1, the power generation unit refers to the smallest unit with independent positive and negative electrodes, which is formed by connecting a plurality of power generation units in series and parallel.

[0058] (3) Laminated assembly

[0059] Referring to FIG. 1, the laminated assembly is formed by stacking the upper and lower power generation units, and more stacked laminated assemblies can be included in the laminated assembly.

[0060] (4) Photovoltaic string

[0061] Referring to FIG. 1, a plurality of laminated assemblies form a battery array, and the power generation units in each laminated assembly are electrically connected (e.g., in series and parallel, without limitation on the specific form) to form a photovoltaic string, and the power generation units in each laminated assembly are electrically connected (e.g., in series and parallel, without limitation on the specific form) to form a photovoltaic string, i.e., the photovoltaic string only includes the power generation units in the same layer.

[0062] Compared with single-layer components, a stacked solar component (or called stacked photovoltaic cell, stacked component) can further improve the conversion efficiency of photovoltaic energy and reduce the power generation cost by having two or more light-absorbing layers with different band gaps. For example, for a stacked component using a transparent perovskite cell as the upper layer and a crystalline silicon cell as the lower layer, on the one hand, the electrical parameters of the perovskite component and the crystalline silicon component are different, and certain layout design is needed to match them, and the matching requirements for voltage or current are high. Specifically, both voltage and current matching need to cut and series-parallel connection design of the cells, which is currently difficult for perovskite components and has certain influence on efficiency and stability; on the other hand, different types of power generation units have different power generation conditions under different irradiation, different temperatures and different shading conditions, and the optimal working points of the upper and lower layers are different. If the upper and lower layers are directly connected, a certain mismatch loss will be caused; on the other hand, the perovskite cell and the crystalline silicon cell have different performance degradation rates and power generation performances. During the whole life cycle, the mismatch loss caused by different degradation rates cannot be ignored; on the other hand, the upper and lower layers have different voltages, and there is a problem of forming a loop to generate internal current, which causes damage to the cells.

[0063] Therefore, when the perovskite / crystalline silicon stacked cell is connected to a photovoltaic system, the above problems can be solved in the following ways: one is to design the electrical parameters of the perovskite component, such as matching the electrical parameters of different power generation units through layout design, but this method cannot solve the adaptation problem under shading or irradiation changes; the other is to increase electrical components, such as voltage regulation modules, anti-reverse diodes and micro-inverters, but this method brings higher cost.

[0064] The battery array provided by the embodiments of the present disclosure can solve the above problems. The present disclosure will be further described in detail below with the help of the drawings and specific embodiments.

[0065] In an embodiment of the present disclosure, please refer to FIG. 2, which is a schematic diagram of a component structure of a battery array 10 provided by an embodiment of the present disclosure. As shown in FIG. 2, the battery array 10 includes a plurality of stacked components (numbered as 101-116 in FIG. 2), and FIG. 2 only shows a battery array 10 including 16 stacked components, but the number of stacked components is not limited and can be much larger than this number.

[0066] Each stack assembly includes a first power generation unit and a second power generation unit arranged in sequence. For example, the upper surface (the light-incident side of the overall stack assembly), the first power generation unit (numbered 201-216 in FIG. 2), the second power generation unit (numbered 301-316 in FIG. 2), and the lower surface (the light-emitting side of the overall stack assembly) are arranged in sequence along the third direction, i.e., the second power generation unit is arranged on the light-emitting side of the first power generation unit. Referring to FIG. 3, sunlight enters from the light-incident side of the overall stack assembly, passes through the first power generation unit and the second power generation unit in sequence, and exits from the light-emitting side of the overall stack assembly. The first power generation unit has independent positive and negative output terminals, and the second power generation unit has independent positive and negative output terminals, i.e., each stack assembly has a four-terminal output. The plurality of stack assemblies are arranged in an array, and the row direction of the array is the first direction, and the column direction of the array is the second direction, the first direction is perpendicular to the third direction, and the second direction is perpendicular to the third direction. The third direction is perpendicular to the light-incident surface and the light-emitting surface of the stack assembly.

[0067] A plurality of first power generation units are electrically connected (the form of series-parallel connection is not limited, and FIG. 2 is only an example) to form a first photovoltaic string. FIG. 2 shows an example in which the first photovoltaic string includes eight first power generation units, i.e., the first power generation unit 201 to the first power generation unit 208 form the first photovoltaic string 1, and the first power generation unit 209 to the first power generation unit 216 form the first photovoltaic string 2.

[0068] A plurality of second power generation units are electrically connected (the form of series-parallel connection is not limited, and FIG. 2 is only an example) to form a second photovoltaic string. FIG. 2 shows an example in which the second photovoltaic string includes eight second power generation units, i.e., the second power generation unit 301 to the second power generation unit 308 form the second photovoltaic string 1, and the second power generation unit 309 to the second power generation unit 316 form the second photovoltaic string 2.

[0069] The battery array 10 further includes a plurality of inverters (numbered 121 and 122 in FIG. 2), each of which includes a plurality of direct-current ports; each direct-current port includes a positive input terminal and a negative input terminal; the positive and negative output terminals of a first photovoltaic string are respectively connected to the positive and negative input terminals of one direct-current port, and the positive and negative output terminals of a second photovoltaic string are respectively connected to the positive and negative input terminals of another direct-current port; the inverters are used to convert the direct-current electricity output by the connected photovoltaic strings into alternating-current electricity. As shown in FIG. 2, the first photovoltaic string 1 is connected to the first direct-current port of the inverter 121, the second photovoltaic string 1 is connected to the second direct-current port of the inverter 121, the first photovoltaic string 2 is connected to the first direct-current port of the inverter 122, and the second photovoltaic string 2 is connected to the second direct-current port of the inverter 122.

[0070] In this way, in the battery array 10, the first photovoltaic module string formed by electrically connecting the first power generation units is independently connected to the inverter, and the second photovoltaic module string formed by electrically connecting the second power generation units is independently connected to the inverter, without directly connecting the different types of power generation units, so that the stacked assembly system can be connected without adjusting the power generation unit version and introducing new electrical elements, and the mismatch of different photovoltaic module strings is improved, and the power generation adaptation loss of different batteries in the stacked assembly is reduced.

[0071] It should be noted that the first power generation unit and the second power generation unit are independent power generation units, which can be batteries of various types, various materials, and various power generation principles, such as primary batteries, secondary batteries, photovoltaic cells, wind power batteries, etc. At the same time, the first power generation unit in all stacked assemblies is the same type of battery, and the second power generation unit in all stacked assemblies is the same type of battery. The "same type" means that the power generation principle, specific structure, specific material of each structure, and size parameters (within the allowable error range) of the power generation unit are the same. The types of the first power generation unit and the second power generation unit are different.

[0072] For example, the first power generation unit and the second power generation unit are both photovoltaic cells, the different first power generation units are all perovskite cells, and the chemical formula of the perovskite cell is the same. The second power generation unit is a crystalline silicon cell. Generally, the perovskite cell is close to the light-receiving side of the overall stacked assembly, and the crystalline silicon cell is close to the light-emitting side of the overall stacked assembly. This is because the light-absorbing layer band gap of the perovskite cell is larger (for example, 1.67 eV), and the light-absorbing layer band gap of the crystalline silicon cell is smaller (for example, 1.12 eV). In this way, the arrangement can obtain maximum efficiency of light energy conversion. The values of the above light-absorbing layer band gap are only examples, and in fact, the specific band gap value of the light-absorbing layer of the battery can be adjusted by various doping methods.

[0073] The perovskite cell and the crystalline silicon cell are both photovoltaic cells, so the perovskite cell can also be referred to as an upper photovoltaic unit, and the crystalline silicon cell can also be referred to as a lower photovoltaic unit. For the stacked assembly:

[0074] (1) The upper photovoltaic unit close to the light-receiving side of the overall stacked assembly includes a transparent photovoltaic assembly, and the lower photovoltaic unit close to the light-emitting side of the overall stacked assembly can be a transparent assembly or a non-transparent assembly, a single-sided assembly or a double-sided assembly. The specific design, type, and structure of the upper and lower photovoltaic units are not limited.

[0075] (2) The upper and lower photovoltaic units are encapsulated between the upper and lower surfaces. The upper surface is a light-transmitting surface, and the lower surface is a light-transmitting surface or a non-light-transmitting surface.

[0076] (3) A transparent insulating material layer is provided between the upper and lower photovoltaic units, which can be a film, glass, or other materials.

[0077] (4) The laminated assembly needs to be packaged, and the packaging form is not limited. The laminated assembly can be assembled or not assembled with a frame.

[0078] (5) The positive and negative output terminals of the upper and lower photovoltaic units are respectively led out. The leading-out mode is not limited, and the leading-out position is not limited.

[0079] In a specific embodiment, a plurality of first power generation units are connected in series to form a first photovoltaic sub-string. As shown in FIG. 2, the first power generation unit 201 and the first power generation unit 202 are connected in series to form the first photovoltaic sub-string 1, the first power generation unit 203 and the first power generation unit 204 are connected in series to form the first photovoltaic sub-string 2, and the first power generation unit 215 and the first power generation unit 216 are connected in series to form the first photovoltaic sub-string 8. A plurality of first photovoltaic sub-strings are connected in parallel to form a first photovoltaic group string. As shown in FIG. 2, the first photovoltaic sub-string 1 (including the first power generation unit 201 and the first power generation unit 202) to the first photovoltaic sub-string 4 (including the first power generation unit 207 and the first power generation unit 208) are connected in parallel to form the first photovoltaic group string 1, and the first photovoltaic sub-string 5 (including the first power generation unit 209 and the first power generation unit 210) to the first photovoltaic sub-string 8 (including the first power generation unit 215 and the first power generation unit 216) are connected in parallel to form the first photovoltaic group string 2.

[0080] A plurality of second power generation units are connected in series to form a second photovoltaic sub-string. As shown in FIG. 2, the second power generation unit 301 to the second power generation unit 304 are connected in series to form the second photovoltaic sub-string 1, the second power generation unit 305 to the second power generation unit 308 are connected in series to form the second photovoltaic sub-string 2, and the second power generation unit 313 to the second power generation unit 316 are connected in series to form the second photovoltaic sub-string 4. A plurality of second photovoltaic sub-strings are connected in parallel to form a second photovoltaic group string. As shown in FIG. 2, the second photovoltaic sub-string 1 and the second photovoltaic sub-string 2 are connected in parallel to form the second photovoltaic group string 1, and the second photovoltaic sub-string 3 and the second photovoltaic sub-string 4 are connected in parallel to form the second photovoltaic group string 2.

[0081] As shown in FIG. 2, every 2 first power generation units are connected in series to form a first photovoltaic sub-string, and then every 4 first photovoltaic sub-strings are connected in parallel to form a first photovoltaic group string. Every 4 second power generation units are also connected in series to form a second photovoltaic sub-string, and every 2 second photovoltaic sub-strings are connected in parallel to form a second photovoltaic group string. There are a total of 2 first photovoltaic group strings and 2 second photovoltaic group strings. When connected to an inverter, the first photovoltaic group string and the second photovoltaic group string are connected through independent direct current ports, without the need to directly electrically connect the first power generation unit and the second power generation unit, so that the mismatch problem is not caused.

[0082] It should be understood that FIG. 2 is only a specific example, in which the number of power generation units in the first / second photovoltaic sub-string and the number of photovoltaic sub-strings in the first / second photovoltaic string are not specific limitations. That is, the first photovoltaic sub-string can include any positive integer of first power generation units, the second photovoltaic sub-string can include any positive integer of second power generation units, the first photovoltaic string can include any positive integer of first photovoltaic sub-strings, and the second photovoltaic string can include any positive integer of second photovoltaic sub-strings. Meanwhile, for the same cell array 10, the number of power generation units included in different first photovoltaic sub-strings (or second photovoltaic sub-strings) can be the same or different, the number of photovoltaic sub-strings included in different first photovoltaic strings (or second photovoltaic strings) can be the same or different, and the number of DC ports in different inverters can be the same or different.

[0083] In another specific embodiment, a plurality of first power generation units are connected in series to form a first photovoltaic sub-string, and a plurality of first photovoltaic sub-strings are connected in series to form a first photovoltaic string.

[0084] A plurality of second power generation units are connected in series to form a second photovoltaic sub-string, and a plurality of second photovoltaic sub-strings are connected in series to form a second photovoltaic string.

[0085] In this way, the power generation units can also be connected in series first and then in parallel to form a photovoltaic string.

[0086] In yet another specific embodiment, a plurality of first power generation units are connected in series first and then in parallel to form a first photovoltaic string, and a plurality of second power generation units are connected in parallel first and then in series to form a second photovoltaic string; or, a plurality of first power generation units are connected in parallel first and then in series to form a first photovoltaic string, and a plurality of second power generation units are connected in series first and then in parallel to form a second photovoltaic string.

[0087] In still another specific embodiment, the series-parallel level can be more. For example, a plurality of first power generation units are connected in series to form a first photovoltaic sub-string, and a plurality of first photovoltaic sub-strings are connected in parallel to form a first photovoltaic sub-string, and a plurality of first-level photovoltaic sub-strings are connected in series to form a first photovoltaic string, and so on.

[0088] It should be noted that the parallel connection of the photovoltaic sub-string can be achieved by connecting the photovoltaic connectors in parallel, the DC photovoltaic bus box or other similar functional devices; the inverter can be a conventional string inverter, a centralized inverter or a distributed inverter, a micro inverter, etc.

[0089] The following are described in the manner that the power generation units are connected in series first and then in parallel to form a photovoltaic string, and other manners can be understood accordingly.

[0090] Specifically, each first photovoltaic string includes z first photovoltaic sub-strings, and each first photovoltaic sub-string includes q first power generation units; each second photovoltaic string includes k second photovoltaic sub-strings, and each second photovoltaic sub-string includes p second power generation units; the number of inverters is a, and each inverter includes b direct current ports; wherein (a x b) ≥ v / (p x k) + v / (q x z).

[0091] In a specific embodiment, the battery array 10 further includes a plurality of battery racks (for example, photovoltaic battery racks), each of which is used to place a laminated assembly; the number v of laminated assemblies accommodated by the battery rack is an integral multiple of the number (q x z) of first power generation units included in the first photovoltaic string, and the number x of laminated assemblies accommodated by the battery rack is an integral multiple of the number (p x k) of second power generation units included in the second photovoltaic string.

[0092] In this way, each battery rack includes an integer number of first photovoltaic strings and an integer number of second photovoltaic strings, and the connection of the first photovoltaic string / second photovoltaic string does not need to be completed across the battery rack, and the connection and installation are relatively simple.

[0093] The specific values of the above-mentioned values p, k, q, and z need to be calculated according to the electrical parameters of the inverter, the system operating conditions, and the electrical parameters of each power generation unit of the assembly. Specifically, first, the number of laminated assemblies in the battery array 10 is calculated according to the total capacity of the battery array 10. It is assumed that a photovoltaic array is installed with v laminated assemblies. According to the voltage level of the inverter and the electrical parameters of different cells in the laminated assembly, the number of strings is calculated in accordance with GB50797. Each p laminated assembly of crystalline silicon cells (i.e., second power generation units) is a string, and the total number of crystalline silicon strings (i.e., the number of second photovoltaic sub-strings) is v / p. k strings of crystalline silicon assemblies are connected in parallel to form a second photovoltaic string, and are connected to one port of the inverter. Therefore, the number of second photovoltaic strings is m = v / (p x k), and m inverter ports are used accordingly. Each q laminated assembly of perovskite cells (i.e., first power generation units) is a string, and the total number of perovskite strings (i.e., the number of first photovoltaic sub-strings) is v / q. According to the perovskite electrical parameters and the input current of the inverter direct current port, the number of parallel strings is calculated. It is assumed that the number of parallel perovskite strings is z strings, and the number of first photovoltaic strings is n = v / (q x z), and n inverter ports are used accordingly. The ratio of the number of second photovoltaic strings to the number of first photovoltaic strings is m:n. If a photovoltaic array uses a inverter, and each inverter has b direct current ports, then the total number of ports of the array is at least a x b. m / (m+n) of the total ports ab are used to connect the crystalline silicon layer strings (i.e., the second photovoltaic strings), and n / (m+n) are used to connect the perovskite layer strings (i.e., the first photovoltaic strings).

[0094] The electrical performance parameters of each cell in the same photovoltaic sub-string should be consistent. When calculating the number of series-connected cells Num, the following formula can be used:

[0095] wherein K v is the open circuit voltage temperature coefficient of the battery, K' v is the operating voltage temperature coefficient of the battery, t is the limit low temperature (in °C) under which the battery is operating, t' is the limit high temperature (in °C) under which the battery is operating, V dcmax is the maximum DC input voltage allowed by the inverter (in V), V mpptmax is the maximum voltage of the inverter MPPT module (see below) (in V), V mpptmin is the minimum voltage of the inverter MPPT module (see below) (in V), V oc is the open circuit voltage of the battery (in V), V pm is the operating voltage of the battery (in V).

[0096] In some embodiments, the first power generating units are electrically connected by a number of first power generating sub-units, and the second power generating units are electrically connected by a number of second power generating sub-units.

[0097] Therefore, by adjusting the number of first power generating sub-units in the first power generating units and / or the series-parallel structure of the first power generating sub-units, the electrical parameters (e.g. V oc , V pm ) of the first power generating units are adjusted, so that the values of q and z are changed, so that the number v of the stacked assemblies accommodated by the battery holder is an integral multiple of the number (q x z) of the first power generating units included in the first photovoltaic group string; similarly, by adjusting the number of second power generating sub-units in the second power generating units and / or the series-parallel structure of the second power generating sub-units, the electrical parameters (e.g. V oc , V pm ) of the second power generating units are adjusted, so that the values of p and k are changed, so that the number v of the stacked assemblies accommodated by the battery holder is an integral multiple of the number (p x k) of the second power generating units included in the second photovoltaic group string.

[0098] For example, assuming that each first power generating unit includes 60 series-connected power generating sub-batteries, it is calculated that each first photovoltaic group string needs to include 8 first power generating units; assuming that each first power generating unit includes 40 series-connected power generating sub-batteries, it is calculated that each second photovoltaic group string needs to include 7 first power generating units, but each battery holder can accommodate 24 stacked assemblies, so that the second photovoltaic group string must be connected across the holders. Assuming that it is found through calculation that if the number of the second power generating sub-batteries included in the second power generating units is adjusted to 50, each second photovoltaic group string only needs to include 6 first power generating units, so that the second photovoltaic group string will not be connected across the holders.

[0099] Further, the number of cells in each first photovoltaic string and the number of generating units in each second photovoltaic string can be designed to be integer multiples of each other, i.e., (p x k) and (q x z) are integer multiples of each other, so that the number of stacked components v accommodated by the cell support is only an integer multiple of the larger one of (p x k) and (q x z), thereby making the design more flexible.

[0100] In this way, in the field of photovoltaic cells, the first photovoltaic string and the second photovoltaic string of a single set of photovoltaic cell supports are both integers, facilitating component connection and string connection. Of course, (p x k) and (q x z) can also not be integer multiples of each other, in which case there can be cross-support string connection, but the array can still be connected in this way.

[0101] In some embodiments, each inverter further includes a plurality of maximum power point tracking (MPPT) modules, the number of MPPT modules being ≤ the number of DC ports, and the same MPPT module being connected to photovoltaic strings under a plurality of DC ports. Each MPPT module is configured to track the maximum power point of the connected photovoltaic strings and adjust the output parameters of the connected photovoltaic strings based on the tracking results to make them in the maximum power state.

[0102] It should be noted that the MPPT module can be implemented using an MPPT controller (Maximum Power Point Tracking), which independently carries an MPPT algorithm and independent boost and buck circuits. For example, the boost circuit can be a Boost circuit and the buck circuit can be a Buck circuit. The specific working principle is to monitor the voltage and current of the battery layer in real time, calculate the current maximum power point, and then adjust the load to make the output characteristics of the battery layer at the maximum power point, which is particularly suitable for photovoltaic cells.

[0103] Referring to FIG. 4, which illustrates the specific connection of one of the inverters 12 in a certain battery array 10. FIG. 4 shows the connection of 3 first photovoltaic strings, 2 second photovoltaic strings, and 1 inverter 12. The inverter 12 includes 5 DC ports, but only 2 MPPT modules, i.e., 12a and 12b. At this time, the MPPT module 12a is connected to 3 DC ports, and the 3 DC ports are all connected to first photovoltaic strings, so that the MPPT module 12a adjusts the output parameters of the connected first photovoltaic strings to make them in the maximum power state; the MPPT module 12b is connected to another 2 DC ports, and the 2 DC ports are all connected to second photovoltaic strings, so that the MPPT module 12b adjusts the output parameters of the connected second photovoltaic strings to make them in the maximum power state.

[0104] That is, when the number of the inverter MPPT modules is less than the number of the DC ports, it is necessary to note that each DC port under the same MPPT module should be connected to the group string of the same type of battery, so that the MPPT module can normally track the maximum power point of different types of photovoltaic power generation units.

[0105] In some embodiments, referring to FIG. 5, the first protection device 131 is further arranged in series in part / whole of the first photovoltaic sub-string; the second protection device 132 is further arranged in series in part / whole of the second photovoltaic sub-string, and the first protection device 131 and the second protection device 132 both only allow unidirectional current flow, that is, both are used to prevent backflow to avoid backflow caused by the voltage difference between different photovoltaic sub-strings. As shown in FIG. 5, the first protection device 131 and the second protection device 132 can be diodes, or other electrical devices capable of achieving the above functions.

[0106] In some embodiments, referring to FIG. 5, the third protection device 141 is further arranged in series in part / whole of the first photovoltaic sub-string, and the third protection device 141 controls the first photovoltaic sub-string to be in an open circuit state when the current flowing through itself is higher than a threshold value; the fourth protection device 142 is further arranged in series in part / whole of the second photovoltaic sub-string, and the fourth protection device 142 controls the second photovoltaic sub-string to be in an open circuit state when the current flowing through itself is higher than a threshold value; the third protection device 141 and the third protection device 142 can be fuses, which are fused when the current flowing through is too large, and can play a role in protecting the battery in the case of failure; of course, the third protection device 141 and the third protection device 142 can also be other electrical devices capable of achieving the above functions.

[0107] Here, the threshold value can be 1.05 times the reference current, and the reference current can be a preset current or a real-time working current Isc of the photovoltaic sub-string.

[0108] In some embodiments, referring to FIG. 6, the first photovoltaic group string further includes a plurality of first voltage regulation modules 151, each first voltage regulation module 151 is connected with the output end of a first photovoltaic sub-string, and is configured to perform voltage boosting and / or voltage reducing processing on the voltage output by the first photovoltaic sub-string, so that the difference between the output voltages of the parallelly connected first photovoltaic sub-strings is less than or equal to a preset voltage threshold.

[0109] It should be noted that due to the difference in manufacturing process and environmental conditions, there will be some difference in the output parameters of the same type of power generation unit, and if the difference is too large, it will cause mismatch. For example, assuming that under certain environmental conditions, the output voltage of the first photovoltaic sub-string 1 is 80V, and the output voltage of the second photovoltaic sub-string 2 is 70V, at this time the first photovoltaic sub-string 1 can be stepped down by the first voltage regulation module 151 connected to the output end of the first photovoltaic sub-string 1, and in an ideal case, the output voltage of the first photovoltaic sub-string 1 is also 70V, so that there is no mismatch problem when the first photovoltaic sub-string 1 and the second photovoltaic sub-string 2 are connected in parallel.

[0110] Similarly, the second photovoltaic string includes a plurality of second voltage regulation modules 152, each second voltage regulation module 152 is connected with the output end of a second photovoltaic sub-string, and is configured to step up and / or step down the voltage output by the second photovoltaic sub-string, so that the difference between the output voltages of the second photovoltaic sub-strings connected in parallel is less than or equal to the preset voltage threshold. The second voltage regulation module 152 has substantially the same effect as the first voltage regulation module 151.

[0111] Therefore, by the first voltage regulation module 151 and the second voltage regulation module 152, power optimization at the string level can be achieved, so that the voltage mismatch between the first photovoltaic sub-strings connected in parallel or the second photovoltaic sub-strings connected in parallel is reduced.

[0112] In particular, the basic working principle of the first voltage regulation module 151 is described as follows: a reference voltage is determined, which can be set in advance or can be the output voltage of other first photovoltaic sub-strings; the output voltage of the connected first photovoltaic sub-string is compared with the reference voltage: if the output voltage of the first power generation unit is higher than the reference voltage, the output voltage of the first power generation unit is stepped down until the difference between the output voltage of the first power generation unit and the reference voltage is less than the preset voltage threshold (the preset voltage threshold can be 2% of the reference voltage); and / or, if the output voltage of the first power generation unit is lower than the reference voltage, the output voltage of the first power generation unit is stepped up until the difference between the output voltage of the first power generation unit and the reference voltage is less than the preset voltage threshold. The working principle of the second voltage regulation module 152 is similar to that of the first voltage regulation module 151.

[0113] The first voltage regulation module 151 and the second voltage regulation module 152 can be implemented by a boost chopper circuit and / or a buck chopper circuit, and the structures of the first voltage regulation module 151 to the second voltage regulation module 152 can be the same or different, and the structures of different first voltage regulation modules 151 (or second voltage regulation modules 152) can be the same or different.

[0114] It should be noted that the Boost circuit is a DC voltage conversion circuit, specifically a non-isolated DC converter with output voltage ≥ input voltage. Please refer to FIG. 7, which shows the specific structure of the boost chopper Boost circuit. As shown in (a) of FIG. 7, the boost chopper circuit includes a first switch 42, a first diode 43, a first inductor 41, and a first capacitor 44. The first switch 42 and the first diode 43 are connected in series at the positive output end (of the power generation unit). The first end of the first switch 42 is connected to the input end of the first diode 43, the first end of the first capacitor 43 is connected to the output end of the first diode 43, and the second end of the first switch 42 and the second end of the first capacitor 43 are both connected to the negative output end (of the battery). The control end of the first switch 42 receives a control signal Con1. Here, the battery array 10 can also include a control module for outputting the control signal Con of each Boost circuit and adjusting the duty cycle of the control signal Con according to the reference voltage / current (and the output voltage / current of the power generation unit to be adjusted) to control the on-off time of the first switch 42 and adjust the boost amplitude of the Boost circuit, so that the difference between the output voltage of the battery and the reference voltage or the difference between the output current of the battery and the reference current is less than or equal to the preset current threshold.

[0115] In addition to the above structure, the Boost circuit has more topological types. Please refer to (b) of FIG. 7. The Boost circuit can also include an additional four diodes. Or as shown in (c) of FIG. 7, the first switch in the Boost circuit can be replaced with a single-pole double-throw switch. Or as shown in (c) of FIG. 7, the Boost circuit can also include an additional resistor as a load. In short, any type of Boost circuit topology that can achieve the boost function can be applied to the present embodiment.

[0116] It should be noted that the Buck circuit is a direct current voltage conversion circuit, specifically a non-isolated direct current converter with output voltage ≤ input voltage. Please refer to FIG. 8, which shows the specific structure of the buck chopper Buck circuit. As shown in FIG. 8, the Buck circuit includes a first switch 42', a first diode 43', a first inductor 41', and a first capacitor 44'. The first switch 42' and the first inductor 41' are connected in series at the positive output end (of the power generation unit), the output end of the first diode 43' is connected to one end of the first inductor 41' close to the first switch 42', the first end of the first capacitor 44' is connected to one end of the first inductor 41' away from the first switch 42', and the input end of the first diode 43' and the first end of the first capacitor 44' are both connected to the negative output end (of the power generation unit). As described above, the control module is also configured to output a control signal Con' for each Buck circuit, and adjust the duty cycle of the control signal Con' according to the reference voltage / current (and the output voltage / current of the battery to be adjusted), so as to control the on-off time of the first switch 42' and adjust the step-down amplitude of the boost chopper Buck circuit, so that the difference between the output voltage (of the battery) and the reference voltage or the difference between the output current (of the battery) and the reference current is less than or equal to the preset value. The above-mentioned switches can be MOSFET, IGBT or other controllable switches.

[0117] In addition to the above structure, the Buck circuit has more topological types, please refer to (b) in FIG. 8, the Buck circuit can additionally include a resistor as a load; or as shown in (c) in FIG. 8, the Buck circuit can additionally include a capacitor. In short, any type of Buck circuit topology that can achieve step-down function can be applied to the present embodiment.

[0118] Please refer to FIG. 9, in some embodiments, each stack assembly further includes a third power generation unit, the first power generation unit, the second power generation unit, and the third power generation unit are stacked along a third direction, and the third power generation unit is arranged on the light output side of the second power generation unit; the plurality of third power generation units are electrically connected to form a third photovoltaic string, and the positive output end and the negative output end of the third photovoltaic string correspondingly connect to the positive input end and the negative input end of one direct current port.

[0119] As shown in FIG. 9, a plurality of third power generation units are connected in series to form a third photovoltaic sub-string, and a plurality of third photovoltaic sub-strings are connected in parallel to form a third photovoltaic string; but this does not constitute a limitation.

[0120] Please refer to FIG. 9, in some embodiments, each stack assembly further comprises a fourth power generation unit, the first power generation unit, the second power generation unit, the third power generation unit, the fourth power generation unit are stacked in the third direction, and the fourth power generation unit is arranged on the light output side of the third power generation unit; a plurality of fourth power generation units are electrically connected to form a fourth photovoltaic string, and the positive output end and the negative output end of a fourth photovoltaic string are respectively connected to the positive input end and the negative input end of a direct current port.

[0121] As shown in FIG. 9, a plurality of fourth power generation units are connected in series to form a fourth photovoltaic sub-string, and a plurality of fourth photovoltaic sub-strings are connected in parallel to form a fourth photovoltaic string; but this does not constitute a relevant limitation.

[0122] …

[0123] That is, the stack assembly can include any number of power generation units, and the power generation units of the same layer in different stack assemblies are connected to form corresponding photovoltaic strings, and then independently access the direct current port of the inverter. In this way, there is no direct electrical connection between different types of power generation units, and the stack assembly system can be accessed without adjusting the power generation unit version and introducing new electrical elements, and the mismatch of the electrical parameters of different power generation units can be improved.

[0124] At this time, the photovoltaic strings connected to the same power point tracking module are of the same material, that is, all connected to the first photovoltaic string, or all connected to the second photovoltaic string, or all connected to the third photovoltaic string, or all connected to the fourth photovoltaic string……

[0125] Any photovoltaic sub-string can be provided with a protection device for preventing backflow and a protection device for preventing excessive current.

[0126] The output end of any power generation unit can be connected to a voltage regulation module that can be used for voltage boosting and / or voltage reduction processing, and the output end of any photovoltaic sub-string can be connected to a voltage regulation module that can be used for voltage boosting and / or voltage reduction processing.

[0127] In order to better understand the present disclosure, a specific application scenario is provided: assuming that the stack assembly includes a perovskite battery (i.e. the first power generation unit) located in the upper layer and a crystalline silicon battery (i.e. the second power generation unit) located in the lower layer, assuming that the efficiency of the stack assembly is 26%, the power of the perovskite layer is 400W, the power of the crystalline silicon layer is 120W, a 50kW inverter is used, a 1000V system is used, a single inverter 8 port is used, a 1.25 capacity ratio is used, and 120 stack assemblies are installed for a single inverter. Four inverters form a sub-array. A total of 32 ports; that is, v=480. A=4, b=8.

[0128] Assuming that the perovskite layer is 5 blocks per string, 4 strings are connected in parallel and then connected to a port of the inverter, that is, q=5, z=4; the crystalline silicon layer is 20 blocks per string, 4 strings are connected in parallel and then connected to a port of the inverter, that is, p=20, k=4; that is, the first photovoltaic group string includes 20 perovskite cells, and the second photovoltaic group string includes 80 crystalline silicon cells.

[0129] At the same time, the battery array 10 adopts fixed photovoltaic cell supports and is installed in double vertical rows. Referring to FIG. 10, a single set of battery supports installs 20 stacked components, and a single set of supports includes one first photovoltaic group string and 1 / 4 second photovoltaic group string. At the same time, the battery array 10 includes 24 sets of supports, and a total of 24 first photovoltaic group strings and 6 second photovoltaic group strings are included, and 24 DC ports exist in the inverter to connect the perovskite layer components (that is, the first photovoltaic group string), and 6 DC ports exist to connect the crystalline silicon layer components (that is, the second photovoltaic group string).

[0130] The embodiment of the present disclosure provides a system access strategy suitable for photovoltaic sub-strings (for example, photovoltaic stacked cells), different power generation units are respectively led out, and are matched with existing inverters according to certain calculation rules to complete system access, eliminate parallel adaptation problems, and greatly improve the power generation efficiency of stacked cells.

[0131] In an embodiment of the present disclosure, referring to FIG. 11, which is a schematic diagram of a composition structure of a battery system 50 provided by the embodiment of the present disclosure. As shown in FIG. 11, the battery system 50 includes the aforementioned battery array 10.

[0132] The battery system 50 can be applied to various technical fields, such as the photovoltaic power generation field, the automobile field, the wind power generation field, the agricultural technology field, and the like. Since the battery array 10 connects the first power generation unit and the second power generation unit in different strings and parallel numbers, respectively accesses different ports of the inverter, and does not set a direct electrical connection between different types of power generation units, the stacked component system access can be completed without adjusting the power generation unit version and introducing new electrical elements, and the mismatching of different photovoltaic power generation units can be improved; thus, the stacked component (for example, crystalline silicon / perovskite) can be accessed to the photovoltaic system without adding other electrical elements and without complex internal version design, and the power generation adaptation loss of different cells in the stacked component can be reduced.

[0133] The above is only a preferred embodiment of the present disclosure, and is not used to limit the protection scope of the present disclosure, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0134] It should be understood that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details of the storage medium and device embodiments of the present disclosure that are not disclosed, please refer to the description of the method embodiments of the present disclosure for understanding.

[0135] It should be understood that the "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present disclosure. Therefore, "in one embodiment" or "in an embodiment" or "in some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present disclosure, the size of the sequence number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure. The sequence number of the above embodiments of the present disclosure is only for description, not representing the advantages or disadvantages of the embodiments. The above description of each embodiment tends to emphasize the differences between each embodiment, and the same or similar parts can be referred to each other, and for the sake of brevity, the text will not be repeated here.

[0136] It should also be noted that in the present disclosure, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0137] The sequence number of the above embodiments of the present disclosure is only for description, not representing the advantages or disadvantages of the embodiments.

[0138] The methods disclosed in several method embodiments provided by the present disclosure can be combined arbitrarily without conflict, to obtain new method embodiments.

[0139] The features disclosed in several product embodiments provided by the present disclosure can be combined arbitrarily without conflict, to obtain new product embodiments.

[0140] The features disclosed in several method or device embodiments provided by the present disclosure can be combined arbitrarily without conflict, to obtain new method embodiments or device embodiments.

[0141] The above merely describes specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

[0142] The above merely describes specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A battery array, the battery array comprising a plurality of stacked components, each stacked component comprising a first power generation unit and a second power generation unit arranged sequentially; A number of the first power generation units are electrically connected to form a first photovoltaic string, and a number of the second power generation units are electrically connected to form a second photovoltaic string; The battery array also includes multiple inverters, each inverter having several DC ports; each DC port includes a positive input terminal and a negative input terminal; the positive output terminal and negative output terminal of a first photovoltaic string are respectively connected to the positive input terminal and negative input terminal of one DC port, and the positive output terminal and negative output terminal of a second photovoltaic string are respectively connected to the positive input terminal and negative input terminal of another DC port.

2. The battery array according to claim 1, wherein, Several of the first power generation units are connected in series to form a first photovoltaic sub-string, and several of the first photovoltaic sub-strings are connected in parallel to form a first photovoltaic array.

3. The battery array according to claim 1, wherein, Several of the first power generation units are connected in parallel to form a first photovoltaic sub-string, and several of the first photovoltaic sub-strings are connected in series to form a first photovoltaic array.

4. The battery array according to claim 2 or 3, wherein, Several second power generation units are connected in series to form a second photovoltaic sub-string, and several second photovoltaic sub-strings are connected in parallel to form a second photovoltaic array.

5. The battery array according to claim 2 or 3, wherein, Several second power generation units are connected in parallel to form a second photovoltaic sub-string, and several second photovoltaic sub-strings are connected in series to form a second photovoltaic array.

6. The battery array according to any one of claims 1-5, wherein, The battery array also includes a plurality of battery supports, each of which is used to place the stacked components; The number of stacked components accommodated in the battery bracket is an integer multiple of the number of first power generation units contained in the first photovoltaic string, and the number of stacked components accommodated in the battery bracket is an integer multiple of the number of second power generation units contained in the second photovoltaic string.

7. The battery array according to claim 6, wherein, The first power generation unit is formed by electrically connecting several first power generation units, and the second power generation unit is formed by electrically connecting several second power generation units; The electrical parameters of the first power generation unit are adjusted by adjusting the number of the first power generation units and / or the series-parallel connection structure in the first power generation unit, so that the number of the stacked components accommodated by the battery bracket is an integer multiple of the number of the first power generation units contained in the first photovoltaic string. The electrical parameters of the second power generation unit are adjusted by adjusting the number of the second power generation units and / or the series-parallel connection structure in the second power generation unit, so that the number of the stacked components accommodated by the battery bracket is an integer multiple of the number of the second power generation units contained in the second photovoltaic string.

8. The battery array according to claim 6 or 7, wherein, The number of first power generation units in the first photovoltaic string and the number of second power generation units in the second photovoltaic string are integer multiples of each other.

9. The battery array according to any one of claims 1-8, wherein, Multiple stacked components are arranged in an array, with the row direction of the array being a first direction and the column direction of the array being a second direction. The first direction is perpendicular to a third direction, and the second direction is perpendicular to the third direction. The first power generation unit and the second power generation unit are stacked along the third direction, and the second power generation unit is located on the light-emitting side of the first power generation unit. The first power generation unit in all the stacked modules is of the same type, and the second power generation unit in all the stacked modules is of the same type; however, the first power generation unit and the second power generation unit are of different types.

10. The battery array according to any one of claims 1-9, wherein, Each inverter further includes multiple power point tracking modules, the number of power point tracking modules being less than or equal to the number of DC ports, and the same power point tracking module being connected to photovoltaic strings under several DC ports; Each of the power point tracking modules is used to track the maximum power point of the connected photovoltaic string and adjust the output parameters of the connected photovoltaic string based on the tracking result so that it is in the maximum power state. In this context, the photovoltaic strings connected to the same power point tracking module are either all first photovoltaic strings or all second photovoltaic strings.

11. The battery array according to claim 4 or 5, wherein, A first protection device is also connected in series in the first photovoltaic sub-string; A second protection device is also connected in series in the second photovoltaic sub-string; Both the first and second protection devices allow current to flow in one direction.

12. The battery array according to claim 4, 5 or 11, wherein, A third protection device is also connected in series in the first photovoltaic substring. When the current flowing through the third protection device is higher than a threshold value, the first photovoltaic substring is controlled to be in an open circuit state. A fourth protection device is also connected in series in the second photovoltaic sub-string; the fourth protection device controls the second photovoltaic sub-string to be in an open circuit state when the current flowing through it is higher than a threshold value.

13. The battery array according to claim 4, 5 or 11, wherein, The first photovoltaic string also includes several first voltage regulation modules. Each first voltage regulation module is connected to the output terminal of one of the first photovoltaic substrings and is configured to boost and / or buck the voltage output by the first photovoltaic substring. The second photovoltaic string includes several second voltage regulation modules. Each second voltage regulation module is connected to the output terminal of a second photovoltaic substring and is configured to boost and / or buck the voltage output by the second photovoltaic substring.

14. The battery array according to claim 13, wherein, The first voltage regulation module includes a boost chopper circuit and / or a buck chopper circuit; The second voltage regulation module includes a boost chopper circuit and / or a buck chopper circuit.

15. The battery array according to claim 14, wherein, The boost chopper circuit includes a first switch, a first diode, a first inductor, and a first capacitor. The first switch and the first diode are connected in series at the positive output terminal of the power generation unit. The first terminal of the first switch is connected to the input terminal of the first diode, the first terminal of the first capacitor is connected to the output terminal of the first diode, and the second terminals of the first switch and the first capacitor are both connected to the negative output terminal of the power generation unit. The control terminal of the first switch receives a control signal.

16. The battery array according to claim 14, wherein, The step-down chopper circuit includes a first switch, a first diode, a first inductor, and a first capacitor. The first switch and the first inductor are connected in series at the positive output terminal of the power generation unit. The output terminal of the first diode is connected to the end of the first inductor closest to the first switch. The first terminal of the first capacitor is connected to the end of the first inductor furthest from the first switch. The input terminal of the first diode and the first terminal of the first capacitor are both connected to the negative output terminal of the power generation unit.

17. The battery array according to any one of claims 14-16, wherein, The battery array also includes a control module, which is used to output control signals for each of the boost chopper circuits and each of the buck chopper circuits, and adjust the duty cycle of each control signal to adjust the voltage adjustment amplitude of each of the boost chopper circuits and each of the buck chopper circuits.

18. The battery array according to any one of claims 1-17, wherein, Each of the stacked components further includes a third power generation unit, wherein the first power generation unit, the second power generation unit, and the third power generation unit are stacked along a third direction, and the third power generation unit is located on the light-emitting side of the second power generation unit; Several of the third power generation units are electrically connected to form a third photovoltaic string; the positive output terminal and negative output terminal of the third photovoltaic string are respectively connected to the positive input terminal and negative input terminal of a DC port.

19. The battery array according to claim 18, wherein, Each stacked assembly further includes a fourth power generation unit. The first power generation unit, the second power generation unit, the third power generation unit, and the fourth power generation unit are stacked in a third direction, and the fourth power generation unit is disposed on the light-emitting side of the third power generation unit. A plurality of the fourth power generation units are electrically connected to form a fourth photovoltaic string. The positive output terminal and the negative output terminal of a fourth photovoltaic string are respectively connected to the positive input terminal and the negative input terminal of a DC port.

20. A battery system comprising a battery array as claimed in any one of claims 1-19.

Images